Description of problem:
the function inode_needs_lookup：

1953         uint64_t     need_lookup = 0;
1954         gf_boolean_t ret         = _gf_false;
1955         int          op_ret      = -1;
1956 
1957         if (!inode || !this)
1958                 return ret;
1959 
1960         ret = _gf_true;
1961         
1962         op_ret = inode_ctx_get (inode, this, &need_lookup);
1963         if (!op_ret && need_lookup == LOOKUP_NOT_NEEDED) {
1964                 ret = _gf_false;
1965         }
1966 
1967         return ret;

The inode will be state LOOKUP_NOT_NEEDED after checked by this function.
It will be wrong if the next lookup fop on this inode go to failed.And maybe 
there will be a race condition, the other thread will check this inode's state before it's current lookup finish.

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