linux-kernel - Re: [RFC] training mpath to discern between SCSI errors

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Message-ID: <4C7B9F14.9080900@mvista.com>
Date:	Mon, 30 Aug 2010 16:07:48 +0400
From:	Sergei Shtylyov <sshtylyov@...sta.com>
To:	Hannes Reinecke <hare@...e.de>
CC:	Mike Snitzer <snitzer@...hat.com>,
	Kiyoshi Ueda <k-ueda@...jp.nec.com>, Tejun Heo <tj@...nel.org>,
	michaelc@...wisc.edu, James.Bottomley@...e.de, tytso@....edu,
	linux-scsi@...r.kernel.org, jaxboe@...ionio.com, jack@...e.cz,
	linux-kernel@...r.kernel.org, swhiteho@...hat.com,
	linux-raid@...r.kernel.org, linux-ide@...r.kernel.org,
	konishi.ryusuke@....ntt.co.jp, linux-fsdevel@...r.kernel.org,
	vst@...b.net, rwheeler@...hat.com, Christoph Hellwig <hch@....de>,
	chris.mason@...cle.com, dm-devel@...hat.com
Subject: Re: [RFC] training mpath to discern between SCSI errors

Hello.

Hannes Reinecke wrote:

> Actually, I think we have two separate issues here:
> 1) The need of having more detailed I/O errors even in the fs layer. This
>    we've already discussed at the LSF, consensus here is to allow other
>    errors than just 'EIO'.
>    Instead of Mike's approach I would rather use existing error codes here;
>    this will make the transition somewhat easier.
>    Initially I would propose to return 'ENOLINK' for a transport failure,
>    'EIO' for a non-retryable failure on the target, and 'ENODEV' for a
>    retryable failure on the target.

    Are you sure it's not vice versa: EIO for retryable and ENODEV for 
non-retryable failures. ENODEV looks more like permanent condition to me.

WBR, Sergei
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