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Status Future consideration
Workspace z/TPF Product Family
Categories z/TPFDF
Created by Guest
Created on Apr 6, 2023

RELATED IDEAS

z/TPFDF read processing should validate and fix backward chain fields as it reads forward

As TPFDF read processing reads forward through a given subfile from the prime block to the 1st overflow, the 2nd overflow, and so on, TPFDF should validate that the backward chain in the next block contains the file address of the previous block. If the file address is not as expected, a diagnostic system error should be issued and the backward chain corrected.  This processing fits naturally in the existing "read forward" logic and should not cause additional overhead during normal processing.

Considerations:
-FARF3/4 and FARF4/5 dispense modes need to be considered.  If the FA is incorrect, it might be that the file address is in the other FARF format.
-This processing would only be done when the subfile is opened with HOLD.
-This processing would only be done for "read forward" processing. Read backwards or any processing that "skips around" the subfile (B+TREE support) would not be included in this.
-Only subfiles with full backward chain support turned on have all backward chains setup.

Idea priority Low

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