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

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Message-ID: <20060823121028.GE5893@suse.de>
Date:	Wed, 23 Aug 2006 14:10:28 +0200
From:	Jens Axboe <axboe@...e.de>
To:	Andi Kleen <ak@...e.de>
Cc:	Akinobu Mita <mita@...aclelinux.com>, akpm@...l.org,
	okuji@...ug.org, linux-kernel@...r.kernel.org
Subject: Re: [patch 4/5] fail-injection capability for disk IO

On Wed, Aug 23 2006, Andi Kleen wrote:
> 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.

But that makes it more tricky to setup a test, since you have to change
from using /dev/sda (for example) to /dev/stacked-driver.

-- 
Jens Axboe

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