OSFST OSFST describes the fields of an OS file status table. When an OS disk is accessed, DMSROS obtains storage from CMS free storage, builds and fills in an CSFST block, which
is ccmparable to a CMS FST block. This block is released by DMSALU. o OSFSTFM 1///////////1 OSFSTFVF S OSFSTLRL A*1 1///////1 A*2 1 A*3 10 OSFSTNXT OSFSTCER 1S OSFSTEND .J 20 OSFSTDSN 4S 50 OSFSTXTN FO OSFSTTYP FS OSFSTNTE 1////////////////////
------------------------------------------------------1 100 OSFSTTRK 1///////////////////////////1 ------------------------------------------------------1 lOS ///////////////////////////1 OSFST!EM 1 110 OSFSTMEM (cont.) 1///////////////////////////1 I Hexadecimal Field
Displacement Name Field Description, Contents, Meaning o
2
4
6 S C
D
E
F 10 14 OSFSTFM DS DS OSFSTBLK DS OSFSTFVF DS OSFSTLRL DS OSFSTRFM DS DS OSFSTFLG DS !t!!§ gg!!1!gg OSFSTALT EQO OSFSTDBK EQO OSFSTMVL EQO OSFSTOMV EQO OSFSTRSW EQO OSFSTXNO DS OSFSTNXT DS OSFSTCHR DS 1H
1H lH 1H 1F lX 1X 1X in OSFSTFLG --X'80'---- X'40' X'OS' X'02' X'01' lX 1F 5X Disk lIode Reserved for IBM use
Elock size
Fixed/variatle flag
Logical record size
A*1 as record for.at
Reserved for IBM use
A*2 Flag byte Alternate track indicator
Elock size not specified in DSCE Multiple volulle data set
Onmoveable data set
Indicates point+1 just issued
A*3 Number of data extents on disk
Next OS FST
CCHHR of last I/O operation
222 IBM VM/370 Data Areas and Control Block Logic
OSFST Hexadeciaal Field
Displacement Name Field Description, Contents, Meaning ------------ --------------------------------------
19 OSFSTEND DS 51 Current extent end
1E OSFSTDSN DS 44C Data set name
4A OSFSTITN DS 1701 Data extents description
Bits defined in OSFSTXTN OSFSTEXii-EQU --OSFSTXTN+30 Location of fourth extent froll DSCB3
F4 OSFSTDSK DS 1H tisk address (Ocuu) F6 OSFSTTYP DS 1H Disk device type (see OSADT fer type flags)
Fa OSFSTNTE DS 51 Used to save CCEHR for NeT! macro
FD DS 3X Reserved for IBM use 100 OSFSTTRK DS 1F No. of tracks per cylinder 104 DS 2F Reserved for IBM use 10C OSFSTMEM DS CL8 Partitioned data set mellber name
114 DS IF Reserved for IBf! u.se 118 DS OD OSFSTLTH EQO (*-OSFST) /8 OS FS'! length in doul:lewords (X'35') Section 2. CMS Iata Areas and Centrcl Blocks 223
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