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

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Message-ID: <20060802110607.GS20108@suse.de>
Date:	Wed, 2 Aug 2006 13:06:09 +0200
From:	Jens Axboe <axboe@...e.de>
To:	Herbert Xu <herbert.xu@...hat.com>
Cc:	Andi Kleen <ak@...e.de>, linux-kernel@...r.kernel.org
Subject: Re: [BLOCK] bh: Ensure bh fits within a page

On Wed, Aug 02 2006, Herbert Xu wrote:
> 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 :)

Or just use a proper interface, no new code should touch submit_bh().

-- 
Jens Axboe

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