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Subject: Re: [Patch 1/6] dm: endio method
From: Christophe Saout <christophe@saout.de>
To: Mike Christie <mikenc@us.ibm.com>
Cc: Joe Thornber <thornber@redhat.com>, Andrew Morton <akpm@osdl.org>,
       Linux Mailing List <linux-kernel@vger.kernel.org>
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Am Sa, den 21.02.2004 schrieb Mike Christie um 10:58:

> This is DM's cloned bio. Is there a guarantee that this value should be 
> safe from lower level drivers overwriting it, or is it similar to b_rdev 
> for buffer_heads?

The block layer is allowed to remap the device. This is done for
partitions, e.g. hda5 -> hda + sector number change
(blk_partition_remap).