From: Peng Tao <bergwolf@gmail.com>
Date: Thu, 23 Aug 2012 16:27:52 +0000 (+0800)
Subject: pnfsblock: fix non-aligned DIO read
X-Git-Tag: v3.7-rc1~58^2~36
X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f742dc4a32587bff50b13dde9d8894b96851951a;p=pandora-kernel.git

pnfsblock: fix non-aligned DIO read

For DIO read, if it is not sector aligned, we should reject it
and resend via MDS. Otherwise there might be data corruption.
Also teach bl_read_pagelist to handle partial page reads for DIO.

Cc: stable <stable@vger.kernel.org> [since v3.4]
Signed-off-by: Peng Tao <tao.peng@emc.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
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