linux-kernel - Re: [patch 6/6] vfs: mountinfo: only show mounts under tasks root

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Message-Id: <E1JbxM9-0002GF-K4@pomaz-ex.szeredi.hu>
Date:	Wed, 19 Mar 2008 13:25:21 +0100
From:	Miklos Szeredi <miklos@...redi.hu>
To:	viro@...IV.linux.org.uk
CC:	miklos@...redi.hu, akpm@...ux-foundation.org, linuxram@...ibm.com,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [patch 6/6] vfs: mountinfo: only show mounts under tasks root

> >  static int show_mountinfo(struct seq_file *m, void *v)
> >  {
> > +	struct proc_mounts *p = m->private;
> > +	size_t count_save = m->count;
> 
> *UGH*.  Do you really need that?  Frankly, in that case I'd rather
> separate the check from __d_path(); unwinds like that are Not Nice(tm).

Agreed.  I did the separate check first, but then there's a window
between the check and __d_path() where the mountpoint might move
outside the root, and trying to prevent that would also add quite a
bit of ugliness.

Miklos
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