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authorJaegeuk Kim <jaegeuk.kim@samsung.com>2013-09-03 13:41:37 +0900
committerJaegeuk Kim <jaegeuk.kim@samsung.com>2013-09-03 13:41:37 +0900
commit222cbdc4835f8151b886b049d6ad56b18f88d470 (patch)
treee691abcacb3c28bae55dfd8896e3a2662cd6936e
parentc34e333fd5ca41317c3dab69ed8a212acacd4aeb (diff)
downloadop-kernel-dev-222cbdc4835f8151b886b049d6ad56b18f88d470.zip
op-kernel-dev-222cbdc4835f8151b886b049d6ad56b18f88d470.tar.gz
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>
-rw-r--r--fs/f2fs/segment.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/f2fs/segment.h b/fs/f2fs/segment.h
index cd9bd93..e0d6d3a 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);
}
/*
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