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[Qemu-devel] Re: [PATCH] scsi: Make device scsi-disk reject /dev/sg*

From: Gerd Hoffmann
Subject: [Qemu-devel] Re: [PATCH] scsi: Make device scsi-disk reject /dev/sg*
Date: Thu, 25 Feb 2010 12:19:04 +0100
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv: Gecko/20091209 Fedora/3.0-4.fc12 Thunderbird/3.0

On 02/25/10 11:23, Markus Armbruster wrote:
You're supposed to use scsi-generic for that.  Which rejects anything
but /dev/sg*.

Well, it isn't *that* easy. The SG_IO ioctl used by scsi-generic works on tons of devices in linux, not only /dev/sg*. I've seen patches floading around which change the check bdrv_is_sg() into "try SG_IO and see if it works", which would allow to use /dev/sda with both scsi-disk and scsi-generic depending on what you want. Which makes alot of sense.

Making that change needs some extra care though to avoid existing configurations switching from scsi-disk to scsi-generic unnoticed.


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