2.5: Can't unmount fs after using NFS

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

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
@@ -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;

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