Minor bug (?) in mountpoint handling in 2.4.18

Minor bug (?) in mountpoint handling in 2.4.18

[Michael Meskes]

fs/namespace::do_add_mount() says:

...
/* Refuse the same filesystem on the same mount point */
...

However, it is still possible to mount the same NFS filesystem to the
same mountpoitn several times:

mme@feivel:/.autofs/nfs/home/mme$ sudo mount zwerg:/exports/usr.local
/mnt
Password:
mme@feivel:/.autofs/nfs/home/mme$ sudo mount zwerg:/exports/usr.local
/mnt
mme@feivel:/.autofs/nfs/home/mme$ df|grep mnt
                       8570480   5685768   2449352  70% /mnt
                       8570480   5685768   2449352  70% /mnt

I'm not sure if this really is a bug as technically it does not create a
problem, but I know a lot of users who are pretty confused.

Michael

P.S.: Please CC me on replies.
-- 
Michael Meskes
Michael@Fam-Meskes.De
Go SF 49ers! Go Rhein Fire!
Use Debian GNU/Linux! Use PostgreSQL!

Re: Minor bug (?) in mountpoint handling in 2.4.18

[Manfred Wassmann]

On Wed, 17 Jul 2002, Michael Meskes wrote:

> fs/namespace::do_add_mount() says:
> 
> ...
> /* Refuse the same filesystem on the same mount point */
> ...

[...]

> I'm not sure if this really is a bug as technically it does not create a
> problem, but I know a lot of users who are pretty confused.

In fact it does create problems.  If you have an entry for a nfs mount in
/etc/fstab allowing it to be mounted by ordinary users using th user
mount option, it is no longer possible for such an user to unmount the
corresponding file system once it is mounted multiple times.  Instead the
following error message is returned:
  umount: it seems /var/www/VTX is mounted multiple times

> P.S.: Please CC me on replies.

ACK