"secure" file flag?

[Dag-ErlingSmørgrav]

Stefan Eßer <se at FreeBSD.org> writes:
> What I'm suggesting is to have the obliteration implemented as an
> add on to the dirty buffer flush, with the difference that the 
> buffer contents is prepared for the next step of the erasure process,
> written out, and then not declared free but again prepared for the
> next overwrite pass.

This next pass won't be until thirty seconds later, so it'll take
about half an hour to completely obliterate a file.  Furthermore,
unmounting a file system less than half an hour after a file is
deleted or truncated will fail, and shutting down will most likely
leave the file system unclean due to repeated failures to flush the
dirty buffer list.

DES
-- 
Dag-Erling Smørgrav - des at des.no