From 6cf3fa6918baab0c447f1206f1cef9166ad04864 Mon Sep 17 00:00:00 2001
From: Roland Dreier <roland@purestorage.com>
Date: Tue, 14 Feb 2012 15:30:31 -0800
Subject: [PATCH] tcm_loop: Set residual field for SCSI commands

If the target core signals an over- or under-run, tcm_loop should call
scsi_set_resid() to tell the SCSI midlayer about the residual data length.

The difference can be seen by doing something like

    strace -eioctl sg_raw -r 1024 /dev/sda 8 0 0 0 1 0 > /dev/null

and looking at the "resid=" part of the SG_IO ioctl -- after this patch,
the field is correctly reported as 512.

Signed-off-by: Roland Dreier <roland@purestorage.com>
Cc: stable@vger.kernel.org
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
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