FUBSECT

Prolog  

Control Block Contents  
   FUBSECT DSECT

Storage Layout  

Cross Reference (Contains links to field and bit definitions)  

FUBSECT Prolog

 NAME       : DMSFUB
 DESCRIPTION: File Space Usage Block
 DSECT      : FUBSECT
 FUNCTION   : Mapping of the CMS File Space Usage
              Block. The FUB contains file space usage
              information for a file space with open output
              files.

FUBSECT Control Block Content

FUBSECT DSECT

Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      FUBSECT        File Space Usage Block
                 FILE SPACE USAGE BLOCK
0000    0 Dbl-Word     8 * (0)
0000    0 Character    3 FUBEYEC        Eyecatcher to indicate a FUB
0003    3 Bitstring    1 FUBFLAG        FUB flags The following are
                                        equates for the FUBFLAG field
          1... ....      FUBPREAL       X'80' This is a preallocated FUB
          .1.. ....      FUBINUSE       X'40' This FUB is currently in
                                        use
          ..1. ....      FUBVALID       X'20' The Server count of
                                        available blocks (FUBSFSAV) is
                                        valid
0004    4 Address      4 FUBPTR         Next File Space Usage Block
0008    8 Signed       4 FUBFLDS (0)
0008    8 Character    8 FUBFPOOL       File Pool name
0010   16 Character    8 FUBFSPAC       File Space name
0018   24 Signed       4 FUBOPENF       Number of files open for output
                                        in this file space
001C   28 Signed       4 FUBSFSAV       Signed integer containing the
                                        number of 4K blocks the SFS
                                        Server believes are left in the
                                        file space. This value may be
                                        negative if the file space limit
                                        is exceeded.
0020   32 Signed       4 FUBCMSUS       Signed integer containing the
                                        number of 4K blocks that CMS must
                                        subtract from FUBSFSAV to
                                        incorporate changes to open
                                        files: CMS writes to unallocated
                                        blocks in CMS cache, CMS writes
                                        following OPEN REPLACE when CMS
                                        blocks are logically deleted
                                        before SPS write. Value is
                                        positive if CMS uses blocks that
                                        Server does not know are used.
                                        Value is negative when CMS makes
                                        blocks available that Server does
                                        not know are available.
0024   36 Signed       4 * (3)          Reserved
          00000030       FUBLB          *-FUBSECT Length of FUB block in
                                        bytes
          00000006       FUBLD          (FUBLB+7)/8 Length of FUB block
                                        in dwords
          00000028       FUBFLDSL       *-FUBFLDS Length of FUB fields to
                                        clear

FUBSECT Storage Layout

          
*** FUBSECT - File Space Usage Block
*
*     +--------------------+------+---------------------------+
*   0 |      FUBEYEC       |:FLAG |          FUBPTR           |
*     +--------------------+------+---------------------------+
*   8 |                       FUBFPOOL                        |
*     +-------------------------------------------------------+
*  10 |                       FUBFSPAC                        |
*     +---------------------------+---------------------------+
*  18 |         FUBOPENF          |         FUBSFSAV          |
*     +---------------------------+---------------------------+
*  20 |         FUBCMSUS          |///////////////////////////|
*     +---------------------------+///////////////////////////|
*     |///////////////////////////////////////////////////////|
*     +-------------------------------------------------------+
*  30
*
*** FUBSECT - File Space Usage Block

FUBSECT Cross Reference

Symbol         Dspl Value
-------------- ---- -----
FUBCMSUS       0020
FUBEYEC        0000
FUBFLAG        0003
FUBFLDS        0008
FUBFLDSL       0024 00000028
FUBFPOOL       0008
FUBFSPAC       0010
FUBINUSE       0003 40
FUBLB          0024 00000030
FUBLD          0024 00000006
FUBOPENF       0018
FUBPREAL       0003 80
FUBPTR         0004
FUBSFSAV       001C
FUBVALID       0003 20