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Date: Fri, 15 Nov 2002 21:16:16 +0100
To: "Petr Vandrovec" <VANDROVE@vc.cvut.cz>
Cc: linux-kernel@vger.kernel.org, richard@bouska.cz
Subject: Re: NFS mountned  directory  and apache2 (2.5.47)
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From: Trond Myklebust <trond.myklebust@fys.uio.no>
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>>>>> " " == 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.

For most filesystems, that means just reading directly from the page
cache, and that is precisely what generic_file_sendfile() does. IIRC,
the sendfile() inode op was added so that those few filesystems which
don't support direct reading of the page cache could roll their own.

Cheers,
  Trond
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