linux-kernel - Re: [PATCH] tcp: do not promote SPLICE_F_NONBLOCK to socket O

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Date:	Fri, 18 Jul 2008 21:43:38 +0300
From:	Octavian Purdila <opurdila@...acom.com>
To:	Evgeniy Polyakov <johnpol@....mipt.ru>
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	axboe@...nel.dk
Subject: Re: [PATCH] tcp: do not promote SPLICE_F_NONBLOCK to socket O_NONBLOCK

On Friday 18 July 2008, Evgeniy Polyakov wrote:

> >
> > and so on until pipe->nrbufs is 16. At than point, we will block in
> > pipe_wait, inside splice_to_pipe.
>
> Seems that SPLICE_F_NONBLOCK check should be propagated from
> tcp_splice_read() into skb_splice_bits(), and this flag is actually
> there already in tss.flags.

I'm not sure I understand you... 

The flag gets propagated to splice_to_pipe (so there is no need to propagate 
the check in skb_splice_bits) but we don't have SPLICE_F_NONBLOCK set, we are 
on the blocking usecase.

Thanks,
tavi
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