REQ_HARDBARRIER and REQ_SOFTBARRIER

From: V P
Date: Sat Feb 24 2007 - 04:56:50 EST


Hi,

I'm trying to modify the ordering of I/O requests in Linux kernel, and
came across the barrier flags REQ_HARDBARRIER and REQ_SOFTBARRIER.

One thing I noticed (which might be wrong) is that all the requests
have both these flags set. What is the significance of these flags? Is
it a must for a request to have this? Can I reorder two requests with
these flags set? How is SOFTBARRIER different from HARDBARRIER?

I appreciate your time and help.

Thanks much.
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/