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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>
This commit is contained in:
qixiaoyu1 2023-02-02 16:20:27 +08:00 committed by Jaegeuk Kim
parent a84153f939
commit b03a41a495
1 changed files with 10 additions and 3 deletions
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13
fs/f2fs/extent_cache.c
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@ -874,11 +874,18 @@ unlock_out:
static unsigned long long __calculate_block_age(unsigned long long new,
unsigned long long old)
{
unsigned long long diff;
unsigned int rem_old, rem_new;
unsigned long long res;
diff = (new >= old) ? new - (new - old) : new + (old - new);
res = div_u64_rem(new, 100, &rem_new) * (100 - LAST_AGE_WEIGHT)
+ div_u64_rem(old, 100, &rem_old) * LAST_AGE_WEIGHT;
return div_u64(diff * LAST_AGE_WEIGHT, 100);
if (rem_new)
res += rem_new * (100 - LAST_AGE_WEIGHT) / 100;
if (rem_old)
res += rem_old * LAST_AGE_WEIGHT / 100;
return res;
}
/* This returns a new age and allocated blocks in ei */