From: Peng Tao <tao.peng@primarydata.com>
Date: Thu, 9 Apr 2015 15:02:16 +0000 (+0800)
Subject: nfs: fix DIO good bytes calculation
X-Git-Tag: omap-for-v4.2/o2_dc~9^2~11
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1ccbad9f9f9bd36db26a10f0b17fbaf12b3ae93a;p=pandora-kernel.git

nfs: fix DIO good bytes calculation

For direct read that has IO size larger than rsize, we'll split
it into several READ requests and nfs_direct_good_bytes() would
count completed bytes incorrectly by eating last zero count reply.

Fix it by handling mirror and non-mirror cases differently such that
we only count mirrored writes differently.

This fixes 5fadeb47("nfs: count DIO good bytes correctly with mirroring").

Reported-by: Jean Spector <jean@primarydata.com>
Cc: <stable@vger.kernel.org> # v3.19+
Signed-off-by: Peng Tao <tao.peng@primarydata.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
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