Subject: Re: [PATCH] sendfile removal
From: Tom Zanussi <zanussi@us.ibm.com>
To: Jens Axboe <jens.axboe@oracle.com>
Cc: linux-kernel@vger.kernel.org, cotte@de.ibm.com, hugh@veritas.com,
       neilb@suse.de, Linus Torvalds <torvalds@osdl.org>, hch@infradead.org
In-Reply-To: <20070531103316.GO32105@kernel.dk>
References: <20070531103316.GO32105@kernel.dk>
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Date: Thu, 31 May 2007 10:33:31 -0500
Message-Id: <1180625611.4514.57.camel@ubuntu>
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On Thu, 2007-05-31 at 12:33 +0200, Jens Axboe wrote:
> Hi,
> 
> This patch removes the ->sendfile() hook from the file_operations
> structure, and replaces the sys_sendfile() mechanism to be based on
> ->splice_read() instead. There should be no functional changes.
> 
> Work to be done:
> 
> - The ext2 xip support needs a splice_read() implementation, currently I
>   just if 0'ed out the send xip_file_sendfile(). CC'ed Carsten, who
>   seems to be the author of this code.
> 
> - shmem needs a splice_read() implementation. Optimistically CC'ed Hugh.
> 
> - nfds: The ->rq_sendfile_ok optimization is gone for now. I can't
>   determine the value of it, but I'm assuming it's there for a reason.
>   Any chance this can be converted to splice, or use something else than
>   ->sendfile()? CC'ed Neil.
> 
> - relay: needs a splice_read() implementation. I think Tom already has
>   one, CC'ed him.
> 

Hi Jens,

Yeah, I have it lying around somewhere - the patch I sent you awhile
back of an initial version of splice_read() is the last work I did on
this.  Basically, it worked OK but IIRC there were a couple things in
the code that needed fixing.  I also modified blktrace to use splice so
I could use it for testing; I'll send a patch for that too once I get it
working again.  

Anyway, that was ages ago (sometime last year ;-) so I'm going to have
to dig up the code and probably rework it a bit.

Tom


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