I'd probably just do this, and to hell with helper functions...
int d_set_mounted(struct dentry *dentry)
{
struct dentry *p;
int ret = 0;
write_seqlock(&rename_lock);
for (p = dentry; !IS_ROOT(p); p = p->d_parent) {
/* Need exclusion wrt. check_submounts_and_drop() */
spin_lock(&p->d_lock);
if (unlikely(d_unhashed(p))) {
spin_unlock(&p->d_lock);
ret = -ENOENT;
goto out;
}
spin_unlock(&p->d_lock);
}
spin_lock(&dentry->d_lock);
dentry->d_flags |= DCACHE_MOUNTED;
spin_unlock(&dentry->d_lock);
out:
write_sequnlock(&rename_lock);
return ret;
}
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