Sets the write position to point at the position given. If the cache has swapped to a file, it reinitializes it, so that the proper data is added to the IO_CACHE buffer. Otherwise, it just does a my_b_seek. my_b_seek will not work if the cache has swapped, that's why we do this workaround. @param[IN] pos the new write position. @param[IN] use_reinit if the position
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