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f2fs: fix overflow when calculating utilization on 32-bit

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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: Changman Lee <cm224.lee@samsung.com>
Reviewed-by: Namjae Jeon <namjae.jeon@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
This commit is contained in:
Changman Lee 2013-02-25 17:38:02 +09:00 committed by Jaegeuk Kim
parent 47b3bc9073
commit 12fc760fd6
1 changed files with 1 additions and 2 deletions
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3
fs/f2fs/segment.h
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@ -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);
}
/*