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List:       dlm-devel
Subject:    [Dlm-devel] Checkin: proc mods, fixes for lock request crashes
From:       Peter Badovinatz <tabmowzo () yahoo ! com>
Date:       2001-03-14 2:03:02
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Good evening.  A small number of changes checked in, but rather important ones.

1. I've integrated Alan Jones' contributions to support /proc on >2.2 kernels
into dlm_kerndd.c.  Ian is integrating the cccp_init.c mods, as well as a
number of other changes to support multi-node testing.  The code in the cvs
tree as of RIGHT NOW will support 2.2, but Ian's changes aren't yet in, so >2.2
not yet there in the cvs tree.

2. I *finally* figured out a bug related to running multiple clients on a
single node...  The code was dereferencing a NULL pointer, which means Oops. 
This took me a while because it was in a section of code unchanged from the AIX
version, that had always worked on AIX.  Somewhere the deep recesses of my
brain finally recalled that it is allowable to deref a NULL pointer in AIX, so
long as you only read from zero...  Fix in clm_client.c:findclient() to quit
shooting itself.  The fix will port back to AIX if anyone ever cares.

3. The /proc interface as it now exists will provide accurate lock counts
outputs, as it wasn't picking up the right data previously.

Result: a one-node, UP-only DLM that seems decently stable.  Kinda doesn't yet
merit the "distributed" moniker.  I've been using the trivial client2.c code I
put in the tree, and forcing some minor lock contention requests, as well as
shared requests, and it's holding together.

We hope to generate a new tarball tomorrow, hopefully with the cccp changes
integrated, to provide a "sorta" stable version for people to use.


=====
These have been the opinions of:
Peter R. Badovinatz -- (503)578-5530 (TL 775)
wombat@us.ibm.com/tabmowzo@yahoo.com
and in no way should be construed as official opinion of 
IBM, Corp.

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