linux-kernel - Re: [PATCH 3/7] vfs: Add a mount-notification facility

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Message-ID: <13970.1559127310@warthog.procyon.org.uk>
Date:   Wed, 29 May 2019 11:55:10 +0100
From:   David Howells <dhowells@...hat.com>
To:     Jann Horn <jannh@...gle.com>
Cc:     dhowells@...hat.com, Al Viro <viro@...iv.linux.org.uk>,
        raven@...maw.net, linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        Linux API <linux-api@...r.kernel.org>,
        linux-block@...r.kernel.org, keyrings@...r.kernel.org,
        linux-security-module <linux-security-module@...r.kernel.org>,
        kernel list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/7] vfs: Add a mount-notification facility

Jann Horn <jannh@...gle.com> wrote:

> > +                       /* Global root? */
> > +                       if (mnt != parent) {
> > +                               cursor.dentry = READ_ONCE(mnt->mnt_mountpoint);
> > +                               mnt = parent;
> > +                               cursor.mnt = &mnt->mnt;
> > +                               continue;
> > +                       }
> > +                       break;
> 
> (nit: this would look clearer if you inverted the condition and wrote
> it as "if (mnt == parent) break;", then you also wouldn't need that
> "continue" or the braces)

It does look better with the logic inverted, but you *do* still need the
continue.  After the if-statement, there is:

	cursor.dentry = cursor.dentry->d_parent;

which we need to skip.  It might make sense to move that into an
else-statement from an aesthetic point of view.

David