Re: [PATCH v2 19/19] sunrpc: Disable splice for krb5i

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On Sun, Jun 18, 2017 at 12:34:38AM -0700, Christoph Hellwig wrote:
> On Sat, Jun 17, 2017 at 01:23:24PM -0400, Chuck Lever wrote:
> > 
> > > On Jun 17, 2017, at 11:07 AM, Christoph Hellwig <hch@xxxxxxxxxxxxx> wrote:
> > > 
> > > On Fri, Jun 16, 2017 at 11:22:54AM -0400, Chuck Lever wrote:
> > >> Running a multi-threaded 8KB fio test (70/30 mix), three or four out
> > >> of twelve of the jobs fail when using krb5i. The failure is an EIO
> > >> on a read.
> > > 
> > > Just curious: what is the backing fs that you tested with?  I'd be
> > > curious if you see this on XFS for example.
> > 
> > I was able to reproduce this with a tmpfs share and
> > with an XFS share on NVMe LUNs.
> 
> Interesting.  XFS actually locks out all writes while doing a buffered
> read, so we end up with two different read instance for the hash vs
> the data, which does indeed sound dangerous.

In the bad case Chuck was seeing, we were going through
splice_direct_to_actor(), is that a buffered read for the purposes of
the above statement?

--b.
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