why we should use two Mutex in OSD ShardData?

[池信泽 <xmdxcxz@xxxxxxxxx>]

hi, all:

   There are two Mutex in ShardData, one is sdata_lock and the other
one is sdata_op_ordering_lock.

    I wonder could we replace sdata_lock with sdata_op_ordering_lock?

-- 
Regards,
xinze
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