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extern int _my_b_async_read(IO_CACHE *info,unsigned char *Buffer,size_t Count);
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extern int my_block_write(IO_CACHE *info, const unsigned char *Buffer,
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extern int my_b_flush_io_cache(IO_CACHE *info, int need_append_buffer_lock);
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#define flush_io_cache(info) my_b_flush_io_cache((info),1)