f2fs: avoid casted negative value as shrink count
This patch makes sure it returns a positive value instead of a probable
casted negative value as shrink count.
Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
diff --git a/fs/f2fs/shrinker.c b/fs/f2fs/shrinker.c
index ec539f4..5c60fc2 100644
--- a/fs/f2fs/shrinker.c
+++ b/fs/f2fs/shrinker.c
@@ -21,14 +21,16 @@
static unsigned long __count_nat_entries(struct f2fs_sb_info *sbi)
{
- return NM_I(sbi)->nat_cnt - NM_I(sbi)->dirty_nat_cnt;
+ long count = NM_I(sbi)->nat_cnt - NM_I(sbi)->dirty_nat_cnt;
+
+ return count > 0 ? count : 0;
}
static unsigned long __count_free_nids(struct f2fs_sb_info *sbi)
{
- if (NM_I(sbi)->nid_cnt[FREE_NID_LIST] > MAX_FREE_NIDS)
- return NM_I(sbi)->nid_cnt[FREE_NID_LIST] - MAX_FREE_NIDS;
- return 0;
+ long count = NM_I(sbi)->nid_cnt[FREE_NID_LIST] - MAX_FREE_NIDS;
+
+ return count > 0 ? count : 0;
}
static unsigned long __count_extent_cache(struct f2fs_sb_info *sbi)