From 222cbdc4835f8151b886b049d6ad56b18f88d470 Mon Sep 17 00:00:00 2001 From: Jaegeuk Kim Date: Tue, 3 Sep 2013 13:41:37 +0900 Subject: 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 --- fs/f2fs/segment.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/f2fs/segment.h b/fs/f2fs/segment.h index cd9bd93212a..e0d6d3abf39 100644 --- a/fs/f2fs/segment.h +++ b/fs/f2fs/segment.h @@ -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); } /* -- cgit v1.2.3-18-g5258