linux-kernel - Re: [PATCH] Perverting cciss

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Date:	Thu, 05 Apr 2007 09:09:10 -0500
From:	James Bottomley <James.Bottomley@...elEye.com>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	Hannes Reinecke <hare@...e.de>, Mike Miller <mike.miller@...com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	SCSI Mailing List <linux-scsi@...r.kernel.org>
Subject: Re: [PATCH] Perverting cciss

On Thu, 2007-04-05 at 11:03 +0100, Christoph Hellwig wrote:
> On Thu, Apr 05, 2007 at 11:58:06AM +0200, Hannes Reinecke wrote:
> > Hi All,
> > 
> > this patch adds the SG_IO ioctl to the cciss driver.
> > As the driver is capable of sending SCSI CDBs to the controller there is
> > no reason why we shouldn't exploit it.
> > This way we get to use all the nice sg_utils for the cciss driver.
> > And a persistent device name for free.
> 
> Instead of adding yet another implementation of SG_IO please implement
> support for REQ_TYPE_BLOCK_PC requests and add all the nice block layer
> passthrough ioctls to it.

Actually, I happen to know that HP is in the process of implementing
this correctly (via REQ_TYPE_BLOCK_PC).  I can't reveal the details but
it has something to do with a well known Linux High Availability company
needing SG_IO for sg_persist to work ...

James


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