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Date: Fri, 15 Nov 2002 20:26:49 +0000
From: Christoph Hellwig <hch@infradead.org>
To: Trond Myklebust <trond.myklebust@fys.uio.no>
Cc: Petr Vandrovec <VANDROVE@vc.cvut.cz>, linux-kernel@vger.kernel.org,
       richard@bouska.cz
Subject: Re: NFS mountned  directory  and apache2 (2.5.47)
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	Trond Myklebust <trond.myklebust@fys.uio.no>,
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On Fri, Nov 15, 2002 at 09:16:16PM +0100, Trond Myklebust wrote:
> >>>>> " " == Petr Vandrovec <VANDROVE@vc.cvut.cz> writes:
> 
>      > It does not change anything on the brokeness of apache2 (or
>      > maybe glibc). It must be able to revert to read/write loop if
>      > sendfile fails with EINVAL. There is no guarantee that existing
>      > sendfile() API means that you can use it with all filesystems.
> 
> I disagree. Sendfile can *always* be emulated using the standard file
> 'read' method.

Linus removed that in early 2.5 because it led to kmap() deadlocks.
sendfile can fail with EINVAL and userspace must not rely on it
working on any object.

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