linux-kernel - Re: [dm-devel] [PATCH v3 11/26] block: Add submit_bio

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Date:	Thu, 04 Oct 2012 08:07:20 +0200
From:	Hannes Reinecke <hare@...e.de>
To:	device-mapper development <dm-devel@...hat.com>
Cc:	Kent Overstreet <koverstreet@...gle.com>,
	Vivek Goyal <vgoyal@...hat.com>, tj@...nel.org,
	axboe@...nel.dk, linux-bcache@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [dm-devel] [PATCH v3 11/26] block: Add submit_bio_wait(), remove
 from md

On 10/02/2012 10:11 PM, Kent Overstreet wrote:
> On Tue, Oct 02, 2012 at 03:41:32PM -0400, Vivek Goyal wrote:
>> On Mon, Sep 24, 2012 at 03:34:51PM -0700, Kent Overstreet wrote:
>>> Random cleanup - this code was duplicated and it's not really specific
>>> to md.
>>>
>>> Also added the ability to return the actual error code.
>>
>> Who is going to make use of actual error code and why checking
>> BIO_UPTODATE is not sufficient (as existing code is doing)?
>
> Some things do, though it's not common and I forget where I saw it -
> checking for -ENOTSUPPORTED vs. other stuff
>
There are also additional error codes like -ENOLINK when the nexus 
is dropped. Quite useful in multipathed or clustered environs.

Cheers,

Hannes
-- 
Dr. Hannes Reinecke		      zSeries & Storage
hare@...e.de			      +49 911 74053 688
SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: J. Hawn, J. Guild, F. Imendörffer, HRB 16746 (AG Nürnberg)
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