LABSECT Back to Index page
 
Prolog 
Control Block Contents 
   LABSECT DSECT
Storage Layout 
Cross Reference (Contains links to field and bit definitions)
Programming Interface Information:
This page documents intended Programming Interfaces that
allow the customer to write programs to obtain the services of z/VM.


  LABSECT Prolog Top of page
  
 NAME       : LABSECT
 DESCRIPTION: Tape Label Information
 DSECT      : LABSECT
 FUNCTION   : LABSECT contains user-supplied tape label
              information used by CMS tape label processing.
              LABSECT is called by the LABSECT macro.
 
 
  LABSECT Control Block Content Top of page
  




 LABSECT DSECT
Top of page


Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      LABSECT        Tape Label Information
0000    0 Address      4 LABNEXT        FORWARD CHAIN POINTER
0004    4 Address      4 LABFCBPT       POINTER TO FCBSECT OR ZERO
0008    8 Character    8 LABFILE        NAME OF FILE (DDNAME) FOR BLOCK
0010   16 Character   17 LABFID         FILE ID (RIGHTMOST 17 CHARACTERS)
0021   33 Character    1 LABSEC         SECURITY
0022   34 Character    6 LABVOLID       VOLUME SERIAL NUMBER (VOLID)
0028   40 Character    4 LABVSEQ        VOLUME SEQUENCE NUMBER
002C   44 Character    4 LABFSEQ        FILE SEQUENCE NUMBER
0030   48 Character    4 LABGENN        GENERATION NUMBER
0034   52 Character    2 LABGENV        GENERATION VERSION
0036   54 Character    6 LABCRD         CREATION DATE
003C   60 Character    6 LABEXD         EXPIRATION DATE
0042   66 Bitstring    1 LABFLAG1       THIS BYTE HAS DEFAULT FLAGS:
          1... ....      LABDFID        X'80' LABDFID DEFAULT FILE ID
          .1.. ....      LABDSEC        X'40' LABDSEC DEFAULT SECURITY
          ..1. ....      LABDVID        X'20' LABDVID DEFAULT VOLUME
                                        SERIAL NUMBER
          ...1 ....      LABDVSEQ       X'10' LABDVSEQ DEFAULT VOLUME
                                        SEQUENCE NUMBER
          .... 1...      LABDFSEQ       X'08' LABDFSEQ DEFAULT FILE
                                        SEQUENCE NUMBER
          .... .1..      LABDGENN       X'04' LABDGENN DEFAULT GENERATION
                                        NUMBER
          .... ..1.      LABDGENV       X'02' LABDGENV DEFAULT GENERATION
                                        VERSION
          .... ...1      LABDCRD        X'01' LABDCRD DEFAULT CREATION
                                        DATE
0043   67 Bitstring    1 LABFLAG2       MISCELLANEOUS FLAGS BYTE:
          1... ....      LABDEXD        X'80' LABDEXD DEFAULT EXPIRATION
                                        DATE
          .1.. ....      LABSCRAT       X'40' LABSCRAT DO 'SCRATCH' VOLID
                                        PROCESSING
          ..1. ....      LABSCRSP       X'20' LABSCRSP SCRATCH SPECIFIED;
                                        NOT DEFAULT
          ...1 ....      LABLBDSC       X'10' LABLBDSC LABSCRAT set by
                                        LABELDEF
          .... .1..      LABFDEF        X'04' LABFDEF LABSECT GOTTEN BY
                                        FILEDEF
          .... ..1.      LABPERM        X'02' LABPERM PERMANENT SPECIFIED
          .... ...1      LABNOCHG       X'01' LABNOCHG NOCHANGE SPECIFIED
0044   68 Address      4 LABCUVOL       POINTER TO CURRENT VOLID MOUNTED
0048   72 Address      4 LABNXVOL       POINTER TO NEXT VOLID TO MOUNT
004C   76 Address      4 LABVSECT       FORWARD CHAIN POINTER TO VOLSECT
0050   80 Address      4 LABCSECT       VOLSECT ADDR OF CURRENT VOLID
0054   84 Character  120 LABVOLS        SPACE FOR 15 ADDITIONAL VOLIDS
00CC  204 Bitstring    4 LABEND         FENCE FOR END OF VOLIDS
00D0  208 Character   44 LABFILID       FILE IDENTIFIER
00FC  252 Character   17 LABSTRP        LAST 17 CHAR OF LABFILID
          00000022       LABSIZE        (*-LABSECT+7)/8 SIZE OF LABSECT
                                        IN DOUBLE WORDS
 
 
  LABSECT Storage Layout Top of page
  
          
*** LABSECT - Tape Label Information
*
*     +---------------------------+---------------------------+
*   0 |         LABNEXT           |         LABFCBPT          |
*     +---------------------------+---------------------------+
*   8 |                       LABFILE                         |
*     +-------------------------------------------------------+
*  10 |                                                       |
*     =                        LABFID                         =
*     |      +------+-----------------------------------------+
*  20 |      |LABSEC|                LABVOLID                 |
*     +------+------+-------------+---------------------------+
*  28 |         LABVSEQ           |         LABFSEQ           |
*     +---------------------------+-------------+-------------+
*  30 |         LABGENN           |  LABGENV    |   (036)-    |
*     +---------------------------+-------------+-------------+
*  38 |         -LABCRD           |         LABEXD-           |
*     +-------------+------+------+---------------------------+
*  40 |   -(03C)    |:FLAG1|:FLAG2|         LABCUVOL          |
*     +-------------+------+------+---------------------------+
*  48 |         LABNXVOL          |         LABVSECT          |
*     +---------------------------+---------------------------+
*  50 |         LABCSECT          |                           |
*     +---------------------------+                           |
*  58 |                                                       |
*     =                       LABVOLS                         =
*     |                           +---------------------------+
*  C8 |                           |          LABEND           |
*     +---------------------------+---------------------------+
*  D0 |                                                       |
*     =                       LABFILID                        =
*     |                           +---------------------------+
*  F8 |                           |                           |
*     +---------------------------+                           |
*     |                       LABSTRP                         |
*     |                                  +--------------------+
*     |                                  | 10D
*     +----------------------------------+
*
*** LABSECT - Tape Label Information
 
 
  LABSECT Cross Reference Top of page
  
 
Symbol         Dspl Value
-------------- ---- -----
LABCRD         0036
LABCSECT       0050
LABCUVOL       0044
LABDCRD        0042 01
LABDEXD        0043 80
LABDFID        0042 80
LABDFSEQ       0042 08
LABDGENN       0042 04
LABDGENV       0042 02
LABDSEC        0042 40
LABDVID        0042 20
LABDVSEQ       0042 10
LABEND         00CC
LABEXD         003C
LABFCBPT       0004
LABFDEF        0043 04
LABFID         0010
LABFILE        0008
LABFILID       00D0
LABFLAG1       0042
LABFLAG2       0043
LABFSEQ        002C
LABGENN        0030
LABGENV        0034
LABLBDSC       0043 10
LABNEXT        0000
LABNOCHG       0043 01
LABNXVOL       0048
LABPERM        0043 02
LABSCRAT       0043 40
LABSCRSP       0043 20
LABSEC         0021
LABSIZE        00FC 00000022
LABSTRP        00FC
LABVOLID       0022
LABVOLS        0054
LABVSECT       004C
LABVSEQ        0028
 
This information is based on z/VM 7.2.0 Last updated on 24 Jun 2020 at 09:36:32 EDT.
Copyright IBM Corporation, 1990, 2020