Re: [PATCH 04/11] vfs: check unlinked ancestors before mount

[Al Viro]

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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