From:	US2RMC::"everhart@arisia.gce.com" 27-MAY-1997 20:15:34.42
To:	star::everhart
CC:	
Subj:	JTdriver stuff

The enclosed files, jtdriver.mar and jtdmn.mar, are technology developed
by me, Glenn C. Everhart, prior to coming to Digital Equipment Corp.
and are my property.

However, I am willing to grant to Digital a perpetual, nonexclusive,
royalty free license to use and modify these pieces of code for purposes
of merging multiple filesystems under one directory structure and/or
for using a database manager or similar process in lieu of top level
directory processing for presenting one or more file structures in a
virtual hierarchy. (I have sent suggestions along these lines to various
people in the VMS filesystems group.)

These pieces of code represent the critical kernel technology for intercepting
I/O at FDT time. The open interception in particular shows how to insert
a thread of kernel execution into (and ahead of) normal processing, for
higher throughput in handling the interception.

While I grant access to the code for the purposes mentioned, I explicitly
do NOT grant free use of the code for purposes of duplicating the functions
of my Safety product. Should Digital wish to duplicate these and incorporate
them in OpenVMS, it must have another agreement with me, which I would
expect to include compensation. Should such be negotiated I am willing to
release the remainder of the code which implements Safety functions.

(Safety provides space monitoring, hierarchical storage, security
enhancements and monitoring, integrity controls, privilege controls,
and support of undelete. The fragmentation avoidance code included here
and in Safety may however be freely used by Digital with no further
notice.)

While the jtdriver code here is complete as it stands (and is linked like
a normal Alpha VMS driver), the jtdmn code expects a number of
additional functions to be supplied. These are not all supplied here,
but their inputs may be deduced from the code.

I can provide some additional bits of information at need.

My hope in doing this is to facilitate VMS Engineering's ability to
produce a file system suitable for a Galaxy class system without the
time needed to build an entirely new file system. The kernel functions
are pretty well all here for many of the desired functions. The rest
could be done in user mode servers, although file creation might be
faster if handled in a kernel thread along the same lines as that present
herein for open processing.

Glenn C. Everhart
27 May, 1997

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% Subject: JTdriver stuff
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