Commit 12fc760f authored by Changman Lee's avatar Changman Lee Committed by Jaegeuk Kim
Browse files

f2fs: fix overflow when calculating utilization on 32-bit 



Use div_u64 to fix overflow when calculating utilization.
*long int* is 4-bytes on 32-bit so (user blocks * 100) might be
overflow if disk size is over e.g. 512GB.

Signed-off-by: default avatarChangman Lee <cm224.lee@samsung.com>
Reviewed-by: default avatarNamjae Jeon <namjae.jeon@samsung.com>
Signed-off-by: default avatarJaegeuk Kim <jaegeuk.kim@samsung.com>
parent 47b3bc90

fs/f2fs/segment.h

+1 −2
Original line number Diff line number Diff line
@@ -464,8 +464,7 @@ static inline bool has_not_enough_free_secs(struct f2fs_sb_info *sbi, int freed) 


static inline int utilization(struct f2fs_sb_info *sbi)

{

	return (long int)valid_user_blocks(sbi) * 100 /

			(long int)sbi->user_block_count;

	return div_u64(valid_user_blocks(sbi) * 100, sbi->user_block_count);

}



/*