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

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Message-ID: <20130905145613.GR13318@ZenIV.linux.org.uk>
Date:	Thu, 5 Sep 2013 15:56:13 +0100
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Miklos Szeredi <miklos@...redi.hu>
Cc:	Linux-Fsdevel <linux-fsdevel@...r.kernel.org>,
	Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"mszeredi@...e.cz" <mszeredi@...e.cz>,
	David Howells <dhowells@...hat.com>,
	Steven Whitehouse <swhiteho@...hat.com>,
	Trond Myklebust <Trond.Myklebust@...app.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH 04/11] vfs: check unlinked ancestors before mount

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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