2.5: Can't unmount fs after using NFS

2.5: Can't unmount fs after using NFS

[Felipe Alfaro Solana]

Hi,

Since I started testing 2.5 on my NFS server, I'm having problems
unmounting filesystems that were exported by NFS (of course, before
trying to unmount, I stopped NFS):

glass:~# cat /etc/mtab
/dev/hda2 / ext3 rw,noatime 0 0
none /proc proc rw 0 0
usbdevfs /proc/bus/usb usbdevfs rw 0 0
/dev/hda3 /data ext3 rw,noatime 0 0
none /dev/pts devpts rw,gid=5,mode=620 0 0
none /dev/shm tmpfs rw 0 0
/dev/hdb2 /media ext3 rw,noatime 0 0

glass:~# cat /etc/exports
/data   192.168.0.100(rw,no_root_squash) 192.168.0.0/24(ro)
/media  192.168.0.100(rw,no_root_squash)

glass:~# /etc/init.d/nfs stop

glass:~# umount /media
umount: /media: device is busy

glass:~# umount /data
umount: /data: device is busy

glass:~# dmesg|tail
hdb: drive_cmd: status=0x51 { DriveReady SeekComplete Error }
hdb: drive_cmd: error=0x04 { DriveStatusError }
kjournald starting.  Commit interval 5 seconds
EXT3-fs warning: maximal mount count reached, running e2fsck is
recommended
EXT3 FS 2.4-0.9.16, 02 Dec 2001 on ide0(3,66), internal journal
EXT3-fs: mounted filesystem with ordered data mode.
nfsd: last server has exited
nfsd: unexporting all filesystems
nfsd: last server has exited
nfsd: unexporting all filesystems

glass:~# umount -f /media
umount2: Device or resource busy
umount: /media: device is busy

glass:~# fuser -vu /media

                     USER        PID ACCESS COMMAND
/media               root     kernel mount  /media

glass:~# fuser -vu /data

                     USER        PID ACCESS COMMAND
/data                root     kernel mount  /data

glass:~# cat /etc/fstab
/dev/hda3               /data                   ext3   
defaults,noatime     1 2
/dev/hda2               /                       ext3   
defaults,noatime     1 1
/dev/hda1               /boot                   ext3   
defaults,noauto      0 0
/dev/hdb2               /media                  ext3   
defaults,noauto,noatime 0 0
none                    /dev/pts                devpts 
gid=5,mode=620       0 0
none                    /proc                   proc   
defaults             0 0
none                    /dev/shm                tmpfs  
defaults             0 0
#/dev/hdb1               swap                    swap   
defaults             0 0
/dev/cdrw               /mnt/cdrw           udf,iso9660
noauto,owner,ro      0 0
/dev/hdc                /cdrom                  auto   
ro,noauto,user,exec  0 0
/dev/scd0               /cdrecorder             auto   
ro,noauto,user,exec  0 0

Is this a bug? This didn't happen with 2.4.

Thanks!

________________________________________________________________________
        Felipe Alfaro Solana
   Linux Registered User #287198
http://counter.li.org

Re: 2.5: Can't unmount fs after using NFS

[Neil Brown]

On  March 30, felipe_alfaro@linuxmail.org wrote:
> Hi,
> 
> Since I started testing 2.5 on my NFS server, I'm having problems
> unmounting filesystems that were exported by NFS (of course, before
> trying to unmount, I stopped NFS):

Thankyou for the bug report.  After spending far too long looking in
the wrong place, I looked in the right place and found it.
This patch should fix it.

NeilBrown


diff ./fs/nfsd/export.c~current~ ./fs/nfsd/export.c
--- ./fs/nfsd/export.c~current~	2003-04-07 10:42:48.000000000 +1000
+++ ./fs/nfsd/export.c	2003-04-07 13:25:55.000000000 +1000
@@ -838,7 +836,7 @@ exp_rootfh(svc_client *clp, char *path, 
 		err = 0;
 	memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh));
 	fh_put(&fh);
-
+	exp_put(exp);
 out:
 	path_release(&nd);
 	return err;

Re: 2.5: Can't unmount fs after using NFS

[Felipe Alfaro Solana]

On Mon, 2003-04-07 at 05:32, Neil Brown wrote:
> On  March 30, felipe_alfaro@linuxmail.org wrote:
> > Hi,
> > 
> > Since I started testing 2.5 on my NFS server, I'm having problems
> > unmounting filesystems that were exported by NFS (of course, before
> > trying to unmount, I stopped NFS):
> 
> Thankyou for the bug report.  After spending far too long looking in
> the wrong place, I looked in the right place and found it.
> This patch should fix it.

I'm sorry to say the patch doesn't fix the problem. After sometime under
normal usage of the NFS server, I can't still unmount the volume after
stopping the NFS service.

Do you want me to do anything else?

________________________________________________________________________
Linux Registered User #287198

Re: 2.5: Can't unmount fs after using NFS

[mikpe]

On 30 Mar 2003 17:03:07 +0200, Felipe Alfaro Solana wrote:
>Since I started testing 2.5 on my NFS server, I'm having problems
>unmounting filesystems that were exported by NFS (of course, before
>trying to unmount, I stopped NFS):

I reported the same problem around 2.5.60 or so.
Sadly, it's still present in 2.5.66.

(RH8.0 user-space, nfs stopped with /etc/rc.d/init.d/nfs stop,
exported ext2 partition remains non-umountable.)

/Mikael