From: Peng Tao <tao.peng@primarydata.com>
Date: Mon, 10 Nov 2014 00:35:35 +0000 (+0800)
Subject: nfs: add nfs_pgio_current_mirror helper
X-Git-Tag: fixes-v4.0-rc1~136^2~27^2~13
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=48d635f14a544c2b3ca870d2c7349b41160496d2;p=pandora-kernel.git

nfs: add nfs_pgio_current_mirror helper

Let it return current nfs_pgio_mirror in use depending on pg_mirror_count.
For read, we always use pg_mirrors[0], so this effectively gives us freedom
to use pg_mirror_idx to track the actual mirror to read from through out the
IO stack.

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