linux-kernel - Re: [PATCH] Re: Bio device too big | kernel BUG at mm/filemap.c:537!

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Date:	Mon, 12 Feb 2007 09:51:27 +0100
From:	"J.A. Magallón" <jamagallon@....com>
To:	Neil Brown <neilb@...e.de>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Re: Bio device too big | kernel BUG at
 mm/filemap.c:537!

On Wed, 7 Feb 2007 10:26:56 +1100, Neil Brown <neilb@...e.de> wrote:

> On Tuesday February 6, neilb@...e.de wrote:
> > 
> > This patch should fix the worst of the offences, but I'd like to
> > experiment and think a bit more before I submit it to stable.
> > And probably test it too - as yet I have only compile and brain
> > tested.
> 
> Ok, I've experimented and tested and now I know what was causing the
> double-unlock.
> 
> The following patch is suitable for 2.6.20.1 and mainline.  There is
> room for a bit more improvement, but only for performance, not
> correctness.  I'll look into that later.
> 

> +	blk_recount_segments(q, bi);

I needed to export blk_recount_segments() to build raid as a module:

--- linux/block/ll_rw_blk.c.orig	2007-02-12 09:46:55.000000000 +0100
+++ linux/block/ll_rw_blk.c	2007-02-12 09:45:57.000000000 +0100
@@ -1258,6 +1258,8 @@
 	bio->bi_flags |= (1 << BIO_SEG_VALID);
 }
 
+EXPORT_SYMBOL(blk_recount_segments);
+
 static int blk_phys_contig_segment(request_queue_t *q, struct bio *bio,
 				   struct bio *nxt)
 {

--
J.A. Magallon <jamagallon()ono!com>     \               Software is like sex:
                                         \         It's better when it's free
Mandriva Linux release 2007.1 (Cooker) for i586
Linux 2.6.19-jam06 (gcc 4.1.2 20070115 (prerelease) (4.1.2-0.20070115.1mdv2007.1)) #1 SMP PREEMPT
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