netdev - Re: [PATCH] net-next: Fix __inet_inherit_port() to correctly increment bsockets and num

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Message-ID: <20101129123909.GA9286@ff.dom.local>
Date:	Mon, 29 Nov 2010 12:39:09 +0000
From:	Jarek Poplawski <jarkao2@...il.com>
To:	Evgeniy Polyakov <zbr@...emap.net>
Cc:	Nagendra Tomar <tomer_iisc@...oo.com>, netdev@...r.kernel.org,
	davem@...emloft.net, Eric Dumazet <eric.dumazet@...il.com>
Subject: Re: [PATCH] net-next: Fix __inet_inherit_port() to correctly
	increment bsockets and num_owners

On 2010-11-29 00:00, Evgeniy Polyakov wrote:
> Hi.
> 
> On Fri, Nov 26, 2010 at 04:26:27PM -0800, Nagendra Tomar (tomer_iisc@...oo.com) wrote:
>> inet sockets corresponding to passive connections are added to the bind hash
>> using ___inet_inherit_port(). These sockets are later removed from the bind 
>> hash using __inet_put_port(). These two functions are not exactly symmetrical. 
>> __inet_put_port() decrements hashinfo->bsockets and tb->num_owners, whereas 
>> ___inet_inherit_port() does not increment them. This results in both of these 
>> going to -ve values.
>>
>> This patch fixes this by calling inet_bind_hash() from ___inet_inherit_port(),
>> which does the right thing.
>>
>> 'bsockets' and 'num_owners' were introduced by commit a9d8f9110d7e953c 
>> (inet: Allowing more than 64k connections and heavily optimize bind(0))
> 
> Yup, things changed from that simple patch a lot.
> Thanks for fixing it up.
> Ack.

Probably I miss something, but since bsockets is increased by each
passive connection now, it seems it will trigger "hash table is full"
too early?

Jarek P.
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