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const unsigned char *record, my_off_t pos);
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size_t (*file_read)(MI_INFO *, unsigned char *, size_t, my_off_t, myf);
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size_t (*file_write)(MI_INFO *, const unsigned char *, size_t, my_off_t, myf);
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ulong this_process; /* processid */
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ulong last_process; /* For table-change-check */
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ulong last_version; /* Version on start */