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extern int init_io_cache(IO_CACHE *info,File file,size_t cachesize,
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extern int init_io_cache(IO_CACHE *info,int file,size_t cachesize,
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enum cache_type type,my_off_t seek_offset,
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bool use_async_io, myf cache_myflags);
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extern bool reinit_io_cache(IO_CACHE *info,enum cache_type type,