linux-kernel - Re: [PATCH] SCSI: Add SG_GET_SG_MAX_SEGMENT

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Message-ID: <1341227897.2987.15.camel@dabdike.int.hansenpartnership.com>
Date:	Mon, 02 Jul 2012 12:18:17 +0100
From:	James Bottomley <James.Bottomley@...senPartnership.com>
To:	Cong Meng <mc@...ux.vnet.ibm.com>
Cc:	stefanha@...ux.vnet.ibm.com, linuxram@...ibm.com,
	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
	senwang@...ux.vnet.ibm.com
Subject: Re: [PATCH] SCSI: Add SG_GET_SG_MAX_SEGMENT_SIZE ioctl to sg device

On Mon, 2012-07-02 at 17:20 +0800, Cong Meng wrote:
> Add a new ioctl cmd to get the max segment size. It's useful in
> virtualization environment for guest to know the queue limits, so
> that the guest kicks off legal scsi command to a sg device.

What's wrong with simply looking in the /sys for this? Plus, if you can
come up with a justifiable reason, this needs to be in block as well so
we can send it to all SCSI devices regardless of what ULD people use.

James


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