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

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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.

Regards,
Tigran

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