Re: FUSE merging?

From: Frank van Maarseveen (frankvm_at_frankvm.com)
Date: 07/01/05

  • Next message: arjun kumar: "reiser4 vs politics: linux misses out again" 
    Date:	Fri, 1 Jul 2005 17:20:03 +0200
To: Miklos Szeredi <miklos@szeredi.hu>

    On Fri, Jul 01, 2005 at 03:21:59PM +0200, Miklos Szeredi wrote:
    >
    > > To require an empty stub to mount FUSE upon makes the whole picture
    > > cleaner: users are only able to extend the namespace _leaf_ nodes for
    > > themselves and processes they can send signals to: setuid programs
    > > which do not fully become root. The existing namespace [nodes] remains
    > > unchanged for everyone.
    >
    > It's not as simple. A filesystem can be mounted many times (either
    > with mount --bind, or just by mounting the same device on multiple
    > mountpoints). In this case you can't ensure, that a mountpoint will
    > remain a leaf node after being mounted on.

    I have bind-mounted / on /net/blabla
    I tried two experiments:

            mounting something under / and looking for it under /net/blabla
            mounting something under /net/blabla and looking for it under /

    The experiment was done with bind mounts and by mounting a USB stick
    (/dev/sdb1) and there was no auto propagation of mounts.

    (2.6.12-rc6)

    How can a leaf dir suddenly become non-leaf by a mount without an explicit
    mount command? 

    -- 
Frank
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  • Next message: arjun kumar: "reiser4 vs politics: linux misses out again"

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