The dirty_ratio was silently limited to >= 5%. This is not a user
expected behavior. Let's rip it.

It's not likely the user space will depend on the old behavior.
So the risk of breaking user space is very low.

CC: Jan Kara <jack@suse.cz>
CC: Neil Brown <redacted>
Signed-off-by: Wu Fengguang <redacted>

Thank you.
	Reviewed-by: KOSAKI Motohiro [off-list ref]



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