Date: Fri, 29 Apr 2005 15:50:42 +0100
From: Jamie Lokier <jamie@shareable.org>
To: viro@parcelfarce.linux.theplanet.co.uk
Cc: Miklos Szeredi <miklos@szeredi.hu>, linuxram@us.ibm.com, ericvh@gmail.com,
       pavel@ucw.cz, hch@infradead.org, linux-fsdevel@vger.kernel.org,
       linux-kernel@vger.kernel.org, akpm@osdl.org
Subject: Question about current->namespace and check_mnt()
Message-ID: <20050429145042.GC17263@mail.shareable.org>
References: <20050425190734.GB28294@mail.shareable.org> <20050426092924.GA4175@elf.ucw.cz> <20050426140715.GA10833@mail.shareable.org> <a4e6962a050428064774e88f4a@mail.gmail.com> <20050428192048.GA2895@mail.shareable.org> <1114717183.4180.718.camel@localhost> <20050428220839.GA5183@mail.shareable.org> <1114761430.4180.1566.camel@localhost> <E1DRWEt-000149-00@dorka.pomaz.szeredi.hu> <20050429144252.GA17263@mail.shareable.org>
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Hi Al,

I have a specific namespace.c question:

I really like to know what the purpose of check_mnt() is in
namespace.c.  In standard kernels you can't enter another process'
namespace so I don't see how check_mnt() can _ever_ fail.  Can it
fail, or in other words, what is the purpose of that check?

And if it can't fail, is there really a need for current->namespace, or
can it just be removed?

Also, I would think the current process' rootmnt->mnt_namespace would
adequately define the "current process namespace", so making
current->namespace redundant in that way.  Is that right?

Thanks,
-- Jamie
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