f2fs: fix wrong calculation of block age
Currently we wrongly calculate the new block age to old * LAST_AGE_WEIGHT / 100. Fix it to new * (100 - LAST_AGE_WEIGHT) / 100 + old * LAST_AGE_WEIGHT / 100. Signed-off-by: qixiaoyu1 <qixiaoyu1@xiaomi.com> Signed-off-by: xiongping1 <xiongping1@xiaomi.com> Reviewed-by: Chao Yu <chao@kernel.org> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
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