From 1d7e10d58a1f62c8c44668cca1cff6a2dd57d7d9 Mon Sep 17 00:00:00 2001 From: Chao Yu Date: Wed, 23 Sep 2015 09:25:43 +0800 Subject: [PATCH] f2fs: fix incorrect bimodal calculation In update_sit_info, we use div_u64 to handle 'u64 divide u64' case, but div_u64 can only handle 32-bits divisor, so our divisor with u64 type passed to div_u64 will overflow, result in the wrong calculation when show debug info of f2fs as below: BDF: 464, avg. vblocks: 23509 (BDF should never exceed 100) So change to use div64_u64 to handle this case correctly. Signed-off-by: Chao Yu Signed-off-by: Jaegeuk Kim --- fs/f2fs/debug.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/f2fs/debug.c b/fs/f2fs/debug.c index ebfcc4039057..615a307a7871 100644 --- a/fs/f2fs/debug.c +++ b/fs/f2fs/debug.c @@ -118,7 +118,7 @@ static void update_sit_info(struct f2fs_sb_info *sbi) } } dist = div_u64(MAIN_SECS(sbi) * hblks_per_sec * hblks_per_sec, 100); - si->bimodal = div_u64(bimodal, dist); + si->bimodal = div64_u64(bimodal, dist); if (si->dirty_count) si->avg_vblocks = div_u64(total_vblocks, ndirty); else -- 2.39.5