linux-kernel - Re: SuSE O_DIRECT|O

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Message-ID: <53234083.3060307@fusionio.com>
Date:	Fri, 14 Mar 2014 12:46:43 -0500
From:	Mike Christie <mchristie@...ionio.com>
To:	NeilBrown <neilb@...e.de>
CC:	Christoph Hellwig <hch@...radead.org>,
	Jens Axboe <axboe@...nel.dk>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	<linux-kernel@...r.kernel.org>, <linux-man@...r.kernel.org>
Subject: Re: SuSE O_DIRECT|O_NONBLOCK overload

On 03/12/2014 07:15 PM, NeilBrown wrote:
> I also think there should probably be just one FAILFAST flag.  Where it was
> the DEV or the TRANSPORT or the DRIVER that failed could be returned in the
> error code for any caller that cared.  But as I don't know why the one became
> three I could well be missing something important.

It was for multipath. The problem was dm-multipath does not know what to
do with low level device errors, but wanted transport errors returned
quickly. Other drivers like the scsi_dh (formerly dm hardware handlers)
modules, want all errors fast failed.

I can add documentation or we can just change the code to better suite
your needs.
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