linux-kernel - Re: [patch 4/5] fail-injection capability for disk IO

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Date:	23 Aug 2006 14:07:10 +0200
From:	Andi Kleen <ak@...e.de>
To:	Akinobu Mita <mita@...aclelinux.com>
Cc:	akpm@...l.org, okuji@...ug.org, Jens Axboe <axboe@...e.de>,
	linux-kernel@...r.kernel.org
Subject: Re: [patch 4/5] fail-injection capability for disk IO

Akinobu Mita <mita@...aclelinux.com> writes:
>   * @bio:  The bio describing the location in memory and on the device.
> @@ -3077,6 +3093,9 @@ end_io:
>  		if (unlikely(test_bit(QUEUE_FLAG_DEAD, &q->queue_flags)))
>  			goto end_io;
>  
> +		if (should_fail(fail_make_request, bio->bi_size))
> +			goto end_io;

AFAIK it is reasonably easy to write stacking block drivers.
I think I would prefer a stackable driver instead of this hook.

-Andi
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