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f2fs: avoid an overflow during utilization calculation 

The current f2fs uses all the block counts with 32 bit numbers, which is able to
cover about 15TB volume.

But in calculation of utilization, f2fs multiplies the count by 100 which can
induce overflow.
This patch fixes this.

Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
This commit is contained in:
Jaegeuk Kim 2013-09-03 13:41:37 +09:00
parent c34e333fd5
commit 222cbdc483
1 changed files with 1 additions and 1 deletions
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2
fs/f2fs/segment.h
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@ -471,7 +471,7 @@ 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 div_u64(valid_user_blocks(sbi) * 100, sbi->user_block_count);
return div_u64((u64)valid_user_blocks(sbi) * 100, sbi->user_block_count);
}
/*