linux-kernel - Re: [PATCH v7 0/5] vfs: Non-blockling buffered fs read (page cache only)

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Date:	Mon, 30 Mar 2015 00:40:20 -0700
From:	Christoph Hellwig <hch@...radead.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Milosz Tanski <milosz@...in.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Christoph Hellwig <hch@...radead.org>,
	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
	"linux-aio@...ck.org" <linux-aio@...ck.org>,
	Mel Gorman <mgorman@...e.de>,
	Volker Lendecke <Volker.Lendecke@...net.de>,
	Tejun Heo <tj@...nel.org>, Jeff Moyer <jmoyer@...hat.com>,
	Theodore Ts'o <tytso@....edu>,
	Al Viro <viro@...iv.linux.org.uk>,
	Linux API <linux-api@...r.kernel.org>,
	Michael Kerrisk <mtk.manpages@...il.com>,
	linux-arch@...r.kernel.org, Dave Chinner <david@...morbit.com>
Subject: Re: [PATCH v7 0/5] vfs: Non-blockling buffered fs read (page cache
 only)

On Fri, Mar 27, 2015 at 10:04:11AM -0700, Andrew Morton wrote:
> mm...  I don't think we should be adding placeholders to the kernel API
> to support code which hasn't been written, tested, reviewed, merged,
> etc.  It's possible none of this will ever happen and we end up with a
> syscall nobody needs or uses.  Plus it's always possible that during
> this development we decide the pwrite2() interface needs alteration but
> it's too late.
> 
> What would be the downside of deferring pwrite2() until it's all
> implemented?

It _is_ implemented.  I just decided to submit it separately as Miklos
already has to deal with enough bikeshedding for his feature that I
don't want to put the burden of dealing with the BS for the one I wrote
on him.
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