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

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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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• Next message: Vojtech Pavlik: "Re: [PATCH] 2.4.20-pre5-ac4: Add support for ALi 5451 gameport"
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