hlist_bl_entry
dentry = dget(hlist_bl_entry(hlist_bl_first(&sb->s_roots), struct dentry, d_hash));
entry = hlist_bl_entry(node, struct mb_cache_entry,
({ tpos = hlist_bl_entry(pos, typeof(*tpos), member); 1;}); \
({ tpos = hlist_bl_entry(pos, typeof(*tpos), member); 1;}); \
({ tpos = hlist_bl_entry(pos, typeof(*tpos), member); 1; }); \