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Old 07-16-2004, 06:24 AM   #1
1kyle
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Sharing USB Ext Disk -- can only Write as ROOT ( Hotplug ??)


I don't know if this is another one of those HOTPLUG USB problems on kernel 2.6 but I've got a nasty little problem trying to WRITE to a USB 250 GB external disk drive shared via NFS as a normal USER and not as ROOT.

SYSTEM A: Desktop with USB external drive attached running SUSE 9.1

Mounted as a HOTPLUG USB entry :

/dev/sda1 on /media/usb-storage-Y42H1MWE:0:0:0p1 type subfs (rw,noexec,nosuid,nodev,sync,procuid,ioch****t=utf8)

Now I can't export this so I mounted on SYSTEM A also as
/dev/sda1 on /media/extdisk type vfat (rw).

I have normal USER READ / WRITE either vial the "Normal" mount point /MEDIA/EXTDISK

or /MEDIA/usb-storage etc. Both Mount points give FULL access to files as a USER for READ WRITE.

(FAT32 file system selected on this drive as it's physically moved on to a WINDOWS box at times for backup -- it's a 250GB MAXTOR external USB drive).

LAPTOP B running SUSE 9.1

it's mounted as :
greyfox.site:/media/extdisk on /home/jim/maxtordrive type nfs (rw,addr=192.168.7.2)


Shows clearly READ WRITE availability.
However I can only get WRITE access IF I'm root -- and it doesn't matter how I set the permissions to /home/jim/maxtordrive.

I've got a feeling this might be due to the way HOTPLUG is implemented in the kernel 2.6

Anybody got any ideas on how to allow a NORMAL USER WRITE access to this disk.


Strange thing is when I've got this disk connected to a WINDOWS BOX and accessing it via SAMBA there is no problem at all with a normal USER and WRITE ACCESS.

Thanks

Last edited by 1kyle; 07-16-2004 at 06:27 AM.
 
Old 08-12-2004, 09:24 AM   #2
jeoppman
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Registered: Aug 2004
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Hi, I obtained the same problem with SuSE 9.1.

I tried to share an external Firewire-Disk for Backup purposes. On the machine where the external disk is connected, the disk is automatically mounted as subfs under /media. I inserted a new line in /etc/exports to share the external disk with rw permissions and restarted the NFS-Server. Trying to mount the shared device from another machine I obtained permission denied.

If you take a look in your /var/log/messages on the machine which is exporting the external disk you see an error message concerning the shared device.

I solved the problem this way: I unmounted the external disk and mounted the device again manual in normal manner. Now everything works fine. Seems to be an error in the new introduced subfs routine.

Subfs does not seem to be the final solution at the moment.

-Jens Oppermann
 
Old 08-12-2004, 11:03 AM   #3
arno
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Registered: Jul 2004
Location: Netherlands
Distribution: fedora core 8, suse 10.3, ubuntu 7.10, kamikaze 7.09
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When you are using NFS you must have to be sure that on the server and the client you have the same UID and GID ( user id and group id)

have a look at
cat /etc/passwd
of both computers
 
Old 08-12-2004, 11:33 AM   #4
jeoppman
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Registered: Aug 2004
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Thanks for that advice, but I use the same userid and the same username on both machines.

Here is the error message (/var/log/messages) from the machine which exports the external disk:

Aug 12 14:37:53 silver rpc.mountd: authenticated mount request from red.bauklimatik.local:674 for /media/ieee1394_sbp2-0
010b9f700f4bffc-1-0p1 (/media/ieee1394_sbp2-0010b9f700f4bffc-1-0p1)
Aug 12 14:37:53 silver rpc.mountd: getfh failed: Operation not permitted

Don't know what 'getfh' does, if anybody knows ...

Thanks for any hints.
 
Old 08-12-2004, 12:01 PM   #5
arno
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Distribution: fedora core 8, suse 10.3, ubuntu 7.10, kamikaze 7.09
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Jeoppman,

I have had a look on the net most references I found pointed at a sharename which could not be found and name below is not a very nice name

/media/ieee1394_sbp2-0
010b9f700f4bffc-1-0p1

could you post the content of

cat /etc/exports
 
  


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