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authorChangman Lee <cm224.lee@samsung.com>2013-02-25 17:38:02 +0900
committerJaegeuk Kim <jaegeuk.kim@samsung.com>2013-03-08 10:02:56 +0900
commit12fc760fd632a96f49e96f519c4aed4eb279bb61 (patch)
tree09d54e3295705601aa0d600fd9a8e94aca444174 /fs/f2fs/segment.h
parent47b3bc907328db968bc9b43c41f48f8d1e140750 (diff)
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: Changman Lee <cm224.lee@samsung.com> Reviewed-by: Namjae Jeon <namjae.jeon@samsung.com> Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
Diffstat (limited to 'fs/f2fs/segment.h')
-rw-r--r--fs/f2fs/segment.h3
1 files changed, 1 insertions, 2 deletions
diff --git a/fs/f2fs/segment.h b/fs/f2fs/segment.h
index 552dadbb2327..e399bd4d3af8 100644
--- a/fs/f2fs/segment.h
+++ b/fs/f2fs/segment.h
@@ -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);
}
/*