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Date:      Sun, 1 Aug 1999 20:01:12 +0200 (CEST)
From:      Martin Blapp <blapp@attic.ch>
To:        freebsd-current@freebsd.org
Cc:        dillon@apollo.backplane.com
Subject:   mountpoint locking with fbsd-nfs
Message-ID:  <Pine.BSF.4.02.9908011934180.4200-100000@bastian.attic.ch>

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I'm a little bit astonished that's now possible to mount via nfs
several times at the same mountpoint with freebsd nfs clients:

normal behaviour (Linux 2.2, Solaris):
--------------------------------------

magma:/ # mount magma:/cdrom /mnt
magma:/ # mount magma:/cdrom /mnt
mount: magma:/cdrom already mounted or /mnt busy

freebsd behaviour (stable and current):
---------------------------------------

# mount magma:/cdrom /mnt
# mount magma:/cdrom /mnt
# mount magma:/cdrom /mnt

#mount
/dev/sd0s2a on / (NFS exported, local, soft-updates, writes: sync 9 async 1508)
/dev/sd0s2e on /var (local, soft-updates, writes: sync 160 async 1695)
procfs on /proc (local)
magma:/cdrom on /mnt
magma:/cdrom on /mnt 
magma:/cdrom on /mnt

I think this is a very strange behaviour ... any ideas ? And as I know
loopback mounts are not possible with fbsd. Am I mistaken ?

Martin



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