writeback: consolidate variable names in balance_dirty_pages()
Introduce nr_dirty = NR_FILE_DIRTY + NR_WRITEBACK + NR_UNSTABLE_NFS in order to simplify many tests in the following patches. balance_dirty_pages() will eventually care only about the dirty sums besides nr_writeback. Acked-by: NJan Kara <jack@suse.cz> Signed-off-by: NWu Fengguang <fengguang.wu@intel.com>
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