Date: Wed, 4 Apr 2001 09:53:33 -0700 (PDT) From: Matt Dillon <dillon@earth.backplane.com> To: Robert Watson <rwatson@FreeBSD.ORG> Cc: Alfred Perlstein <bright@wintelcom.net>, Brian Somers <brian@Awfulhak.org>, freebsd-arch@FreeBSD.ORG Subject: Re: Eliminate crget() from nfs kernel code? Message-ID: <200104041653.f34GrX188215@earth.backplane.com> References: <Pine.NEB.3.96L.1010404113251.14983A-100000@fledge.watson.org>
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:For those interested in giving the p->p_ucred version a try, the simply
:patch is below. It works between FreeBSD boxes, and my tests against
:Solaris 5.5. Unfortunately, my remote NFS test box already has interop
:problems with Linux due to the new mount_nfs that I haven't applied
:patches to yet, so I can't test that case.
:
:Robert N M Watson FreeBSD Core Team, TrustedBSD Project
:robert@fledge.watson.org NAI Labs, Safeport Network Services
It occurs to me that we may have a general problem with p->p_ucred
here. For KSEs to work, processes will not be able to assume that
they 'own' p->p_ucred if/when they block. What happens if one thread
is blocked in a system call that is using p->p_ucred directly without
bumping its ref count and another thread goes in and changes the cred?
-Matt
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