UBIFS: Add an assertion for clean_zn_cnt

This patch adds a new ubifs_assert() in ubifs_tnc_close() to check
if there are any leaks of per-filesystem @clean_zn_cnt. This new
assert inspects whether the return value of ubifs_destroy_tnc_subtree()
is equal to @clean_zn_cnt or not while umount.

Artem: a minor amendment

Signed-off-by: hujianyang <hujianyang@huawei.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>

1 files changed, 3 insertions, 2 deletions

diff --git a/fs/ubifs/tnc.c b/fs/ubifs/tnc.c
index 9083bc7ed4ae..8a40cf9c02d7 100644
--- a/fs/ubifs/tnc.c
+++ b/fs/ubifs/tnc.c
@@ -2859,10 +2859,11 @@ void ubifs_tnc_close(struct ubifs_info *c)
 {
         tnc_destroy_cnext(c);
         if (c->zroot.znode) {
-                long n;
+                long n, freed;
 
-                ubifs_destroy_tnc_subtree(c->zroot.znode);
                 n = atomic_long_read(&c->clean_zn_cnt);
+                freed = ubifs_destroy_tnc_subtree(c->zroot.znode);
+                ubifs_assert(freed == n);
                 atomic_long_sub(n, &ubifs_clean_zn_cnt);
         }
         kfree(c->gap_lebs);