From: Peng Tao <bergwolf@gmail.com>
Date: Tue, 29 May 2012 05:57:58 +0000 (+0800)
Subject: pnfsblock: bail out partial page IO
X-Git-Tag: v3.6-rc1~29^2~16
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=159e0561e322dd8008fff59e36efff8d2bdd0b0e;p=pandora-kernel.git

pnfsblock: bail out partial page IO

Current block layout driver read/write code assumes page
aligned IO in many places. Add a checker to validate the assumption.
Otherwise there would be data corruption like when application does
open(O_WRONLY) and page unaliged write.

Signed-off-by: Peng Tao <tao.peng@emc.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
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