linux-kernel - Re: [patch 0/3] make splice more generic

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Message-ID: <20090514202706.GB20363@shareable.org>
Date:	Thu, 14 May 2009 21:27:06 +0100
From:	Jamie Lokier <jamie@...reable.org>
To:	Jens Axboe <jens.axboe@...cle.com>
Cc:	Miklos Szeredi <miklos@...redi.hu>,
	Max Kellermann <max@...mpel.org>,
	torvalds@...ux-foundation.org, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [patch 0/3] make splice more generic

Jens Axboe wrote:
> SPLICE_F_MOVE is a soft flag in that it will move if it
> can, but not fail if it can't.

According to local man page, it's not even that.

  SPLICE_F_MOVE      [...] The initial implementation of this flag  was  buggy:
		     therefore  starting  in  Linux  2.6.21 it is a *no-op*
		     (but is still permitted in a splice() call); in  the
		     future, a correct implementation may be restored.

> Perhaps we should add a flag that does pass back an error if we
> can't just move pages around, SPLICE_F_STRICT or something like
> that.

What should it do in cases where the kernel would choose to copy data,
i.e. data that isn't a whole page?

-- Jamie
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