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Re: [Qemu-devel] [PATCH] raw-posix: improve detection of scsi-generic de
From: |
Christoph Hellwig |
Subject: |
Re: [Qemu-devel] [PATCH] raw-posix: improve detection of scsi-generic devices |
Date: |
Tue, 7 Sep 2010 04:04:48 +0200 |
User-agent: |
Mutt/1.3.28i |
On Mon, Sep 06, 2010 at 05:39:00PM +0200, Alexander Graf wrote:
>
> On 06.09.2010, at 17:06, Bernhard Kohl wrote:
>
> > From: Bernhard Kohl <address@hidden>
> >
> > Allow symbolic links which point to /dev/sgX devices.
>
> Couldn't you send an SG_IO test ioctl over and see if it works? I really
> dislike the whole file name magic matching.
You could, but the result would not be what you expect, given that every
/dev/sd* device and more in Linux support it.
What we really need is to stop shoe-horning scsi pass through support
into the block layer. Once we finally get our generic thread offload
facilily there is no need for it anymore at all, scsi-generic can
simplify offload the SG_IO ioctl and be done with it. I even have an
old prototype for this, just waiting for the generic thread offload
to get merged before resurrecting it.