[stgt] [PATCH 1/2] [tgt]: Add proper STGT LUN backstore passthrough support

FUJITA Tomonori fujita.tomonori at lab.ntt.co.jp
Fri Jun 4 10:39:19 CEST 2010

On Tue,  1 Jun 2010 01:50:45 -0700
"Nicholas A. Bellinger" <nab at linux-iscsi.org> wrote:

> This patch adds two new queueing and completion function pointers to
> struct scsi_lu called ->cmd_perform() and ->cmd_done() for handling
> existing internal STGT port emulation and the struct scsi_cmd

Using new function pointers look fine. However, have you tried the
existing non passthrough code? This patch seems to break it. I've not
looked at the details though.

I don't think you need to touch to sbc.c. we should not need to know
the type of underlying devices with passthough. Can you add a new
device type such as struct device_type_template sg_template?

__cmd_done_passthrough() doesn't need to call post_cmd_done(), I
think because post_cmd_done() checks the pending commands. With
passthrough, there is no pending commands.

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