Which HDIO_ command(s) to flush all data to disk

[Alex Davis]

I'm trying to write a program that flushes all outstanding data to 
an IDE hard drive, including the write cache. Is it sufficient just
to write:

unsigned char args[4] = {WIN_FLUSH_CACHE,0,0,0};
ioctl(fd, HDIO_DRIVE_CMD, &args)

or do I need to worry about the buffer cache as well(WIN_WRITE_BUFFER?)

Thanks in advance.

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