From: Nicholas Bellinger <nab@linux-iscsi.org>
Date: Fri, 16 Sep 2011 23:55:47 +0000 (-0700)
Subject: iscsi-target: Fix sendpage breakage with proper padding+DataDigest iovec offsets
X-Git-Tag: v3.1-rc7~27^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=40b054970afcf067896d62cd6f7e617c62665304;p=pandora-kernel.git

iscsi-target: Fix sendpage breakage with proper padding+DataDigest iovec offsets

This patch fixes a bug in the iscsit_fe_sendpage_sg() transmit codepath that
was originally introduced with the v3.1 iscsi-target merge that incorrectly
uses hardcoded cmd->iov_data_count values to determine cmd->iov_data[] offsets
for extra outgoing padding and DataDigest payload vectors.

This code is obviously incorrect for the DataDigest enabled case with sendpage
offload, and this fix ensures correct operation for padding + DataDigest,
padding only, and DataDigest only cases.  The bug was introduced during a
pre-merge change in iscsit_fe_sendpage_sg() to natively use struct scatterlist
instead of the legacy v3.0 struct se_mem logic.

Cc: Andy Grover <agrover@redhat.com>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
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