Re: mounting a filesystem nowhere? (was Re: set_fs_pwd/set_fs_root(tsk, NULL, NULL) are OK?)

From: Alexander Viro (
Date: Mon May 08 2000 - 15:22:22 EST

On Mon, 8 May 2000, Tigran Aivazian wrote:

> On Fri, 5 May 2000, Alexander Viro wrote:
> >
> > We don't have to mount it anywhere within the user's reach.
> >
> Could you (only if you have a spare minute) say a few more words about
> this, please? I.e. my reading of do_mount() is such that it will
> necessarily create a vfsmount entry on successful return. So, how is it
> that you are talking about "not mounting anywhere within the user's
> reach"? I.e. where else can I possibly mount a filesystem and how?
> All I need is some static path like "/nullfs" which can never be looked
> up by any lookup except the ones coming from mount/umount.

Wait for the next tree - it's there (check FS_SINGLE and kern_mount();
examples in pipefs, procfs and shmfs).

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