linux-kernel - Re: [PATCH 1/2] vmsplice: unmap gifted pages for recipient

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Date:	Tue, 08 Oct 2013 09:14:11 -0700
From:	Dave Hansen <dave@...1.net>
To:	Robert C Jennings <rcj@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org
CC:	linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Rik van Riel <riel@...hat.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Matt Helsley <matt.helsley@...il.com>,
	Anthony Liguori <anthony@...emonkey.ws>,
	Michael Roth <mdroth@...ux.vnet.ibm.com>,
	Lei Li <lilei@...ux.vnet.ibm.com>,
	Leonardo Garcia <lagarcia@...ux.vnet.ibm.com>,
	Vlastimil Babka <vbabka@...e.cz>
Subject: Re: [PATCH 1/2] vmsplice: unmap gifted pages for recipient

On 10/07/2013 01:21 PM, Robert C Jennings wrote:
> +					} else {
> +						if (vma)
> +							zap_page_range(vma,
> +								user_start,
> +								(user_end -
> +								 user_start),
> +								NULL);
> +						vma = find_vma_intersection(
> +								current->mm,
> +								useraddr,
> +								(useraddr +
> +								 PAGE_SIZE));
> +						if (!IS_ERR_OR_NULL(vma)) {
> +							user_start = useraddr;
> +							user_end = (useraddr +
> +								    PAGE_SIZE);
> +						} else
> +							vma = NULL;
> +					}

This is pretty unspeakably hideous.  Was there truly no better way to do
this?
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