From: Peng Tao <tao.peng@primarydata.com>
Date: Mon, 10 Nov 2014 00:35:34 +0000 (+0800)
Subject: nfs: only reset desc->pg_mirror_idx when mirroring is supported
X-Git-Tag: fixes-v4.0-rc1~136^2~27^2~14
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=47af81f29556a45493e5c87289c3c16ce911096c;p=pandora-kernel.git

nfs: only reset desc->pg_mirror_idx when mirroring is supported

so that we don't reset desc->pg_mirror_idx for read unnecessarily.
Remove WARN_ON_ONCE from __nfs_pageio_add_request to allow LD to
set pg_mirror_idx for read where pg_mirror_count is always 1.

Signed-off-by: Peng Tao <tao.peng@primarydata.com>
Signed-off-by: Tom Haynes <loghyr@primarydata.com>
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