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