repeated nfs mounts..

repeated nfs mounts..

[volodya]

Weird thing: I can repeatedly mount nfs filesystem over the same mount
point.. Anyone has an explanation ? I am running 2.4.9.

                        Vladimir Dergachev

inspire:/home/volodya# mount 
/dev/hda2 on / type ext2 (rw) 
/dev/hda7 on /u type ext2 (rw) 
/dev/hda1 on /c type vfat (rw) 
/dev/hdc on /cdrom type iso9660 (ro,nosuid,nodev) 
none on /proc type proc (rw) 
none on /dev/pts type devpts (rw,gid=5,mode=620) 
none on /devfs type devfs (rw) 
none on /proc/bus/usb type usbdevfs (rw) 
inspire:/home/volodya# mount /
mount: /dev/hda2 already mounted or / busy 
mount: according to mtab, /dev/hda2 is already mounted on / 
inspire:/home/volodya# mount /nfs/storage/ 
inspire:/home/volodya# mount /nfs/storage/
inspire:/home/volodya# mount /nfs/storage/ 
inspire:/home/volodya# mount /nfs/storage/ 
inspire:/home/volodya# ls /nfs/storage/ 
samba  u
inspire:/home/volodya# mount 
/dev/hda2 on / type ext2 (rw) 
/dev/hda7 on /u type ext2 (rw) 
/dev/hda1 on /c type vfat (rw) 
/dev/hdc on /cdrom type iso9660 (ro,nosuid,nodev) 
none on /proc type proc (rw) 
none on /dev/pts type devpts (rw,gid=5,mode=620) 
none on /devfs type devfs (rw) 
none on /proc/bus/usb type usbdevfs (rw) 
node4:/storage/ on /nfs/storage type nfs (rw,nosuid,nodev,addr=192.168.0.4,addr=192.168.0.4) 
node4:/storage/ on /nfs/storage type nfs (rw,nosuid,nodev,addr=192.168.0.4,addr=192.168.0.4) 
node4:/storage/ on /nfs/storage type nfs (rw,nosuid,nodev,addr=192.168.0.4,addr=192.168.0.4) 
node4:/storage/ on /nfs/storage type nfs (rw,nosuid,nodev,addr=192.168.0.4,addr=192.168.0.4) 
inspire:/home/volodya# umount /nfs/storage/ 
inspire:/home/volodya# ls /nfs/storage/ 
samba  u
inspire:/home/volodya# 
inspire:/home/volodya# umount /nfs/storage/
inspire:/home/volodya# ls /nfs/storage/
samba  u
inspire:/home/volodya# umount /nfs/storage/
inspire:/home/volodya# ls /nfs/storage/
samba  u
inspire:/home/volodya# umount /nfs/storage/
inspire:/home/volodya# ls /nfs/storage/
inspire:/home/volodya#

Re: repeated nfs mounts..

[Erik Mouw]

On Fri, Sep 14, 2001 at 07:18:36PM -0400, volodya@mindspring.com wrote:
> Weird thing: I can repeatedly mount nfs filesystem over the same mount
> point.. Anyone has an explanation ? I am running 2.4.9.

I think http://www.tux.org/lkml/#s14-6 answers your question.


Erik

-- 
J.A.K. (Erik) Mouw, Information and Communication Theory Group, Department
of Electrical Engineering, Faculty of Information Technology and Systems,
Delft University of Technology, PO BOX 5031,  2600 GA Delft, The Netherlands
Phone: +31-15-2783635  Fax: +31-15-2781843  Email: J.A.K.Mouw@its.tudelft.nl
WWW: http://www-ict.its.tudelft.nl/~erik/

Re: repeated nfs mounts..

[volodya]

On Sat, 15 Sep 2001, Erik Mouw wrote:

> On Fri, Sep 14, 2001 at 07:18:36PM -0400, volodya@mindspring.com wrote:
> > Weird thing: I can repeatedly mount nfs filesystem over the same mount
> > point.. Anyone has an explanation ? I am running 2.4.9.
> 
> I think http://www.tux.org/lkml/#s14-6 answers your question.

But for a mount to succeed aren't we supposed to do this over an empty
directory ? So we should not be able to mount the same filesystem twice in
the same place (provided it has some files in it).

                                     Vladimir Dergachev

> 
> 
> Erik
> 
> -- 
> J.A.K. (Erik) Mouw, Information and Communication Theory Group, Department
> of Electrical Engineering, Faculty of Information Technology and Systems,
> Delft University of Technology, PO BOX 5031,  2600 GA Delft, The Netherlands
> Phone: +31-15-2783635  Fax: +31-15-2781843  Email: J.A.K.Mouw@its.tudelft.nl
> WWW: http://www-ict.its.tudelft.nl/~erik/
> 

Re: repeated nfs mounts..

[Erik Mouw]

On Sat, Sep 15, 2001 at 12:21:19PM -0400, volodya@mindspring.com wrote:
> On Sat, 15 Sep 2001, Erik Mouw wrote:
> > I think http://www.tux.org/lkml/#s14-6 answers your question.
> 
> But for a mount to succeed aren't we supposed to do this over an empty
> directory ?

No, that has never been the case.


Erik

-- 
J.A.K. (Erik) Mouw, Information and Communication Theory Group, Department
of Electrical Engineering, Faculty of Information Technology and Systems,
Delft University of Technology, PO BOX 5031,  2600 GA Delft, The Netherlands
Phone: +31-15-2783635  Fax: +31-15-2781843  Email: J.A.K.Mouw@its.tudelft.nl
WWW: http://www-ict.its.tudelft.nl/~erik/