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Bug#21113036 - MYSQL/INNODB MIX BUFFERED AND DIRECT IO
As man page of open(2) suggested, we should open the same file in the same mode, to have better performance. For some data files, we will first call os_file_create_simple_no_error_handling_func() to open them, and then call os_file_create_func() again. We have to make sure if DIRECT IO is specified, these two functions should both open file with O_DIRECT. Reviewed-by: Sunny Bains <email@example.com> RB: 8981
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