linux-kernel - Re: PATCH 2.6.21-rc1 aoe: handle zero

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Message-ID: <20070302044910.GA22209@infradead.org>
Date:	Fri, 2 Mar 2007 04:49:10 +0000
From:	Christoph Hellwig <hch@...radead.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Christoph Hellwig <hch@...radead.org>, support@...aid.com,
	"Ed L. Cashin" <ecashin@...aid.com>, linux-kernel@...r.kernel.org,
	Greg KH <greg@...ah.com>
Subject: Re: PATCH 2.6.21-rc1 aoe: handle zero _count pages in bios

On Thu, Mar 01, 2007 at 08:48:06PM -0800, Andrew Morton wrote:
> On Fri, 2 Mar 2007 04:30:39 +0000 Christoph Hellwig <hch@...radead.org> wrote:
> 
> > But in this case we'd really need to enforce this, and add a
> > BUG_ON(PageSlab(page)) in bio_add_page to trip everyone submit
> > this kind of pages.
> 
> That would be
> 
> 	BUG_ON(PageSlab(page) && page_count(page) == 0)?

No, all slab pages.  Currently they all have a reference count of
zero, but we generally don't want people to pass in pages that
come from a non-refcounted allocator.

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