[RFC][PATCH 0/7] some random writeback fixes

[Wu Fengguang]

Hi all,

These are some writeback fixes based on the latest linux-next without
the vm.max_writeback_mb knob, since I'm not aware of any strong reasons
for introducing it. Instead, the MAX_WRITEBACK_PAGES is directly increased
to 64MB.

Other patches are straightforward. Needs more tests but it's enough to show
the basic ideas. Comments are welcome!

Thanks,
Fengguang
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