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SubjectLinux NFS client problems with SGI server

The situation: an SGI Origin 200 fileserver running IRIX 6.4, exporting
two filesystems for ~25 clients (SGI Indy/O2/Octane/Onyx, Sun Sparc IPC,
i386 Linux). The IRIX NFS server supports NFS v2 and v3; the SGI clients
use v3, the Suns v2, and I don't know how to find out what the Linux
machine uses.

The exports file on the Origin (server1) looks like:

# The software disk plus the images. Note the "nohide" option.
/usr/it -access=clients:friends
/usr/it/images -access=clients:friends,nohide
# User home directories.
/home -access=clients:friends

The fstab file on the Linux machine:

/dev/hda1 / ext2 defaults,errors=remount-ro 0 1
/dev/hda2 none swap sw 0 0
proc /proc proc defaults 0 0
/dev/hda5 /var ext2 defaults 0 2
/dev/hda6 /tmp ext2 defaults 0 2
/dev/hda7 /usr ext2 defaults 0 2
server1:/home /home nfs defaults 0 0
server1:/usr/it /usr/it nfs defaults 0 0
server2:/var/spool/mail /var/spool/mail nfs defaults 0 0

Server2 is an old Sun Sparc2 running SunOS 4.1.3.

The /home and /var/spool/mail filesystems never give problems, but the
/usr/it filesystem sometimes stops to work while it is mounted: binaries
on /usr/it refuse to work, and "ls /usr/it" returns "ls: /usr/it:
Input/output error". After I unmount and remount /usr/it, it works again.
The kernel log shows:

Jul 16 09:03:44 kalman kernel: __nfs_fhget: inode 128 still busy,i_count=2
Jul 16 09:03:44 kalman kernel: __nfs_fhget: killing /// filehandle
Jul 16 09:04:09 kalman kernel: __nfs_fhget: inode 128 still busy,i_count=2
Jul 16 09:04:09 kalman kernel: __nfs_fhget: killing /// filehandle

I'm not quite sure if this is from my "ls" request, or from the "umount"
command. The error shows up in Linux 2.2.3, 2.2.8, and 2.2.10, all with
NFS compiled as a module. I tried several mount options: rsize=4096,
nolock, and nfsvers=2, but the problem still remains. The machine is
running Debian 2.0. Is this a kernel bug, or am I doing something wrong?


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: +31-15-2785859 Fax: +31-15-2781843 Email

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