From: Peng Tao <tao.peng@primarydata.com>
Date: Mon, 19 Jan 2015 04:41:16 +0000 (+0800)
Subject: nfs: count DIO good bytes correctly with mirroring
X-Git-Tag: fixes-v4.0-rc1~136^2~27^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5fadeb47dcc5c30d4b6cf481b4a78689eab59443;p=pandora-kernel.git

nfs: count DIO good bytes correctly with mirroring

When resending to MDS, we might resend multiple mirroring
requests to MDS. As a result, nfs_direct_good_bytes() ends
up counting bytes multiple times, causing application to
get wrong return results in read/write syscalls.

Fix it by tracking start of a dreq and checking the range of
pgio header.

Cc: Weston Andros Adamson <dros@primarydata.com>
Signed-off-by: Peng Tao <tao.peng@primarydata.com>
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