more writeback patches for 3.1

Hi,

These patches are mainly seperated out from the original IO-less writeback
patchset. They are general useful as standalone improvements. This
series is based on the write bandwidth patches posted at

	https://lkml.org/lkml/2011/6/12/69

They'll appear in this git branch after a while, and be posted in one
single series for the next version.

git://git.kernel.org/pub/scm/linux/kernel/git/wfg/writeback.git fs-writeback

cleanups
	[PATCH 1/7] writeback: consolidate variable names in balance_dirty_pages()
	[PATCH 2/7] writeback: add parameters to __bdi_update_bandwidth()

dirty limits
	[PATCH 3/7] writeback: introduce smoothed global dirty limit
	[PATCH 4/7] writeback: introduce max-pause and pass-good dirty limits

write chunk size
	[PATCH 5/7] writeback: make writeback_control.nr_to_write straight
	[PATCH 6/7] writeback: scale IO chunk size up to half device bandwidth

dirty exceeded state
	[PATCH 7/7] writeback: timestamp based bdi dirty_exceeded state

Thanks,
Fengguang

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