linux-kernel - Re: New copyfile system call

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Message-ID: <51273FE3.8000306@redhat.com>
Date:	Fri, 22 Feb 2013 10:52:35 +0100
From:	Ric Wheeler <rwheeler@...hat.com>
To:	Paolo Bonzini <pbonzini@...hat.com>
CC:	Zach Brown <zab@...hat.com>,
	"Myklebust, Trond" <Trond.Myklebust@...app.com>,
	Linux FS Devel <linux-fsdevel@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Chris L. Mason" <clmason@...ionio.com>,
	Christoph Hellwig <hch@...radead.org>,
	Alexander Viro <aviro@...hat.com>,
	"Martin K. Petersen" <mkp@....net>, Hannes Reinecke <hare@...e.de>,
	Joel Becker <jlbec@...lplan.org>
Subject: Re: New copyfile system call - discuss before LSF?

On 02/22/2013 10:47 AM, Paolo Bonzini wrote:
> Il 21/02/2013 23:24, Zach Brown ha scritto:
>> You could make it work with some locking and out_fd seeking to set the
>> write offset before calling sendfile64()+flags, but ugh.
>>
>>   ssize_t sendfile(int out_fd, int in_fd, off_t in_offset, off_t
>>                    out_offset, size_t count, int flags);
>>
>> That seems closer.
>>
>> We might also want to pre-emptively offer iovs instead of offsets,
>> because that's the very first thing that's going to be requested after
>> people prototype having to iterate calling sendfile() for each
>> contiguous copy region.
> Indeed, I was about to propose that exactly.  So that would be
> psendfilev.  I don't think psendfile is useful, and can be easily
> provided at the libc level.
>
> Paolo

This seems to be suspiciously close to a clear consensus on how to move forward 
after many years of spinning our wheels. Anyone want to promote an actual patch 
before we change our collective minds?

Ric

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