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Date: Sun, 8 Sep 2002 03:21:21 +0100
From: Jamie Lokier <lk@tantalophile.demon.co.uk>
To: Alexander Viro <viro@math.psu.edu>
Cc: Daniel Phillips <phillips@arcor.de>, Rusty Russell <rusty@rustcorp.com.au>,
       linux-kernel@vger.kernel.org
Subject: Re: Question about pseudo filesystems
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References: <20020907192736.A22492@kushida.apsleyroad.org> <Pine.GSO.4.21.0209071544090.23598-100000@weyl.math.psu.edu>
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Alexander Viro wrote:
> It is neither safe nor needed.  Please, look at the previous posting again -
> neither variant calls mntput() in ->release().
> 
> Now, __fput() _does_ call mntput() - always.  And yes, if that happens to
> be the final reference - it's OK.

Thanks, that's really nice.

I'd assumed `kern_mount' was similar to mounting a normal filesystem,
but in a non-existent namespace.  Traditionally in unix you can't
unmount a filesystem when its in use, and mounts don't disappear when
the last file being used on them disappears.

But you've rather cutely arranged that these kinds of mount _do_
disappear when the last file being used on them disappears.  Clever, if
a bit disturbing.

-- Jamie

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