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bool open_cached_file(const char *dir, const char *prefix, size_t cache_size, myf cache_myflags);
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extern int _my_b_get(io_cache_st *info);
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extern int _my_b_async_read(io_cache_st *info,unsigned char *Buffer,size_t Count);
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extern int my_block_write(io_cache_st *info, const unsigned char *Buffer, size_t Count, my_off_t pos);
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} /* namespace internal */
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} /* namespace drizzled */