[patch] POSIX advisory mode lock panic fix by Dfly

[Devon H. O'Dell]

Joerg Sonnenberger wrote:
On Tue, Apr 20, 2004 at 02:24:56PM +0200, Devon H. O'Dell wrote:

Hey all,

I've ported my patch for the local kernel panic that I fixed in a patch 
for FreeBSD over to DragonflyBSD as well. It's available at 
http://sitetronics.com/lockfix.dfly.tar.gz. I'd appreciate feedback for 
this .


Beside some typos, this fix provides a very persimistic solution and makes
locking/unlocking impossible in a few cases, were the lock counter doesn't
have to be increased.
>
I have an optimistic fix for the same problem at
ftp://dragonflybsd.dyndns.org/posix-locks.diff
I hope someone else can review it :)
Thanks for perusing my patch, Joerg. I see how your patch works; 
basically, instead of the unconditional lock increment at the beginning, 
you're only incrementing it in places where it won't be freed and 
keeping the extra lock case in lf_split. Looks doable.

Sorry, for the typos, the patch was applied by hand ;)

I'll merge your stuff with my stuff, take Matt's suggestions into 
account, and get another patch back to the list.

Kind regards,

Devon H. O'Dell


Joerg


Please note that this is pretty much a literal copy of the patch I made 
for FreeBSD. It hasn't been thoroughly reviewed by that crowd, so it's 
probably not a bad idea for you guys to do that too .

Let me know if anything needs to change.

Kind regards,


Patch, bug & regard welcome, in that order :)


Devon H. O'Dell
Well it's good to see that the committers _here_ have time to review 
patches, anyway :P. My thread on arch@ has been dead for a week!

--Devon