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

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Message-Id: <20070206171509.f92e0ed2.akpm@linux-foundation.org>
Date:	Tue, 6 Feb 2007 17:15:09 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Neil Brown <neilb@...e.de>
Cc:	"Kai" <epimetreus@...tmail.fm>, stable@...e.de, org@...e.de,
	linux-kernel@...r.kernel.org, Jens Axboe <jens.axboe@...cle.com>
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:

> +static int bio_fits_rdev(struct bio *bi)
> +{
> +	request_queue_t *q = bdev_get_queue(bi->bi_bdev);
> +
> +	if ((bi->bi_size>>9) > q->max_sectors)
> +		return 0;
> +	blk_recount_segments(q, bi);
> +	if (bi->bi_phys_segments > q->max_phys_segments ||
> +	    bi->bi_hw_segments > q->max_hw_segments)
> +		return 0;
> +
> +	if (q->merge_bvec_fn)
> +		/* it's too hard to apply the merge_bvec_fn at this stage,
> +		 * just just give up
> +		 */
> +		return 0;
> +
> +	return 1;
> +}

Isn't think going to return 0 rather a lot of the time?

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