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f2fs: avoid casted negative value as shrink count

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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>
This commit is contained in:
Chao Yu 2016-10-11 22:31:36 +08:00 committed by Jaegeuk Kim
parent 3a2ad5672b
commit 02110a4fd5
1 changed files with 6 additions and 4 deletions
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10
fs/f2fs/shrinker.c
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@ -21,14 +21,16 @@ static unsigned int shrinker_run_no;
static unsigned long __count_nat_entries(struct f2fs_sb_info *sbi) 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) static unsigned long __count_free_nids(struct f2fs_sb_info *sbi)
{ {
if (NM_I(sbi)->nid_cnt[FREE_NID_LIST] > MAX_FREE_NIDS) long count = 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; return count > 0 ? count : 0;
} }
static unsigned long __count_extent_cache(struct f2fs_sb_info *sbi) static unsigned long __count_extent_cache(struct f2fs_sb_info *sbi)