From: Christoph Hellwig <hch@lst.de>
Date: Thu, 21 Aug 2014 16:09:29 +0000 (-0500)
Subject: pnfs/blocklayout: correctly decrement extent length
X-Git-Tag: fixes-for-v3.18-merge-window~10^2~47
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=921b81a8cd5a4acc2a009778d13eedd377362c4c;p=pandora-kernel.git

pnfs/blocklayout: correctly decrement extent length

When we do non-page sized reads we can underflow the extent_length variable
and read incorrect data.  Fix the extent_length calculation and change to
defensive <= checks for the extent length in the read and write path.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
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