From mboxrd@z Thu Jan  1 00:00:00 1970
Message-Id: <200504132109.j3DL9nJ18827@augusta.math.psu.edu>
To: Fans of the OS Plan 9 from Bell Labs <9fans@cse.psu.edu>
Subject: Re: [9fans] page fault with lock held 
In-Reply-To: Your message of "Wed, 13 Apr 2005 08:48:56 -1000."
	<Pine.BSI.4.61.0504130846240.5044@malasada.lava.net> 
Date: Wed, 13 Apr 2005 17:09:49 -0400
From: Dan Cross <cross@math.psu.edu>
Topicbox-Message-UUID: 37955b22-ead0-11e9-9d60-3106f5b1d025

Tim Newsham <newsham@lava.net> writes:
> > I like the idea of having a way to hook into the bottom of sd from user
> > land!
> 
> What about the /dev/sd??/raw file?  For scsi devices at least (sdscsi.c)
> this calls through to scsirio which directly performs a scsi operation.

Isn't that pushing the protocol the opposite direction?

You want a way to tell the kernel, ``here's a file descriptor to a SCSI
device; talk to it and hook it into devsd.''  Not to send a SCSI
command to an existing device that already appears under
/dev/sdwhatever.

	- Dan C.