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Callbacks when the actual read I/O happens. These were added and
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are currently used for binary logging of LOAD DATA INFILE - when a
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block is read from the file, we create a block create/append event, and
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of course be used for other things
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void* arg; /* for use by pre/post_read */
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char *file_name; /* if used with 'open_cached_file' */