DCACHE_DENTRY_KILLED
if (unlikely(dentry->d_flags & DCACHE_DENTRY_KILLED)) {
if (likely(!(dentry->d_flags & DCACHE_DENTRY_KILLED))) {
if (unlikely(dentry->d_flags & DCACHE_DENTRY_KILLED))
dentry->d_flags |= DCACHE_DENTRY_KILLED;