ovl_inode_version_get
u64 ovl_inode_version_get(struct inode *inode);
if (cache && ovl_inode_version_get(inode) != cache->version) {
if (cache && ovl_inode_version_get(inode) == cache->version) {
cache->version = ovl_inode_version_get(inode);
if (cache && ovl_inode_version_get(inode) == cache->version)
cache->version = ovl_inode_version_get(inode);