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      md: restore ability of spare drives to spin down. · 1176568d
      NeilBrown 提交于
      Some time ago we stopped the clean/active metadata updates
      from being written to a 'spare' device in most cases so that
      it could spin down and say spun down.  Device failure/removal
      etc are still recorded on spares.
      
      However commit 51d5668c broke this 50% of the time,
      depending on whether the event count is even or odd.
      The change log entry said:
      
         This means that the alignment between 'odd/even' and
          'clean/dirty' might take a little longer to attain,
      
      how ever the code makes no attempt to create that alignment, so it
      could take arbitrarily long.
      
      So when we find that clean/dirty is not aligned with odd/even,
      force a second metadata-update immediately.  There are already cases
      where a second metadata-update is needed immediately (e.g. when a
      device fails during the metadata update).  We just piggy-back on that.
      Reported-by: NJoe Bryant <tenminjoe@yahoo.com>
      Signed-off-by: NNeilBrown <neilb@suse.de>
      Cc: stable@kernel.org
      1176568d