netdev - Re: [PATCH 3/4] xfrm: remove policy lock when accessing policy->walk.dead

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Message-Id: <1270042795.26743.31.camel@bigi>
Date:	Wed, 31 Mar 2010 09:39:55 -0400
From:	jamal <hadi@...erus.ca>
To:	Herbert Xu <herbert@...dor.apana.org.au>
Cc:	Timo Teras <timo.teras@....fi>, netdev@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH 3/4] xfrm: remove policy lock when accessing
 policy->walk.dead

On Wed, 2010-03-31 at 09:32 -0400, jamal wrote:

> I did not touch pfkey. That behavior remains there. 

Sorry - I lied. I did touch pfkey. Here was my reasoning.

RFC 2367 says flushing behavior should be:
1) user space -> kernel: flush
2) kernel: flush
3) kernel -> user space: flush event to ALL listeners

This is not realistic today in the presence of selinux policies
which may reject the flush etc. So we make the sequence become:
1) user space -> kernel: flush
2) kernel: flush
3) kernel -> user space: flush response to originater from #1
4) if there were no errors then:
kernel -> user space: flush event to ALL listeners

This was in the logs.

cheers,
jamal

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