linux-kernel - Re: [BLOCK] bh: Ensure bh fits within a page

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Date:	Wed, 2 Aug 2006 08:09:54 +1000
From:	Herbert Xu <herbert.xu@...hat.com>
To:	Andi Kleen <ak@...e.de>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [BLOCK] bh: Ensure bh fits within a page

On Tue, Aug 01, 2006 at 09:33:54PM +0200, Andi Kleen wrote:
> > diff --git a/fs/buffer.c b/fs/buffer.c
> > index 71649ef..b998f08 100644
> > --- a/fs/buffer.c
> > +++ b/fs/buffer.c
> > @@ -2790,6 +2790,7 @@ int submit_bh(int rw, struct buffer_head
> >  	BUG_ON(!buffer_locked(bh));
> >  	BUG_ON(!buffer_mapped(bh));
> >  	BUG_ON(!bh->b_end_io);
> > +	WARN_ON(bh_offset(bh) + bh->b_size > PAGE_SIZE);
> 
> What happens when someone implements direct large page IO?

Then they'll need to change submit_bh to generate more than one bvec.
At that time they can remove this warning :)

Cheers,
-- 
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
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