netdev - Re: sendfile from 9p fs into af

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Message-ID: <20161123045558.GA43893@ast-mbp.thefacebook.com>
Date:   Tue, 22 Nov 2016 20:55:59 -0800
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Al Viro <viro@...IV.linux.org.uk>
Cc:     linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <kafai@...com>
Subject: Re: sendfile from 9p fs into af_alg

On Wed, Nov 23, 2016 at 04:46:26AM +0000, Al Viro wrote:
> On Tue, Nov 22, 2016 at 07:58:29PM -0800, Alexei Starovoitov wrote:
> > Hi Al,
> > 
> > it seems the following commit 523ac9afc73a ("switch default_file_splice_read() to use of pipe-backed iov_iter")
> > breaks sendfile from 9p fs into af_alg socket.
> > sendfile into af_alg is used by iproute2/tc.
> > I'm not sure whether it's 9p or crypto or vfs problem, but happy to test any patches.
> 
> Could you try -rc6 (or anything that contains 680bb946a1ae04, for that
> matter)?

already tested with that patch in the latest net-next. Still broken :(