netdev - [PATCH 0/8 net-2.6.26] [NETNS]: namespace refcounting cleanup

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Message-Id: <1208262959.21529.32.camel@iris.sw.ru>
Date:	Tue, 15 Apr 2008 16:35:59 +0400
From:	"Denis V. Lunev" <den@...nvz.org>
To:	David Miller <davem@...emloft.net>
Cc:	Netdev List <netdev@...r.kernel.org>,
	containers <containers@...ts.osdl.org>,
	Daniel Lezcano <dlezcano@...ibm.com>
Subject: [PATCH 0/8 net-2.6.26] [NETNS]: namespace refcounting cleanup

Network namespace has two referrence counters:
- count
- use_count.
The namespace is scheduled to destruction automatically when the count
becomes 0.

There are several SLAB objects with a pointer to a namespace on them.
These objects are cleaned up during namespace stop. Some of them
increment use_count, some don't. This set fixes this discrepancy,
i.e. now all such objects increment the use_count.

Though, the use_count itself is used in a very debug manner and checked
only during namespace stop. So, I have placed it under
NETNS_REFCNT_DEBUG definition exactly like this is done for socket
refcounting code to remove extra atomic from any possible fast paths.

Signed-off-by: Denis V. Lunev <den@...nvz.org>

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