Hello everyone,
I'm encountering unmount issues with lockd on stock 2.4.18 kernels. The
problem:
On the raidzone1(ip=192.168.2.224) server host(where knfsd is running on
2.4.18), prior to exporting /home to client 192.168.2.134 with
rw,sync,no_root_squash options, I mount /dev/sda1 to /home. Then I
export the client.(btw, this is the only client+export point in the
kernel tables)
On the nfs client(ip=192.168.2.134) which also has a stock 2.4.18
kernel, I mount the nfs export-point /home from raidzone1 onto /test. I
go ahead and issue a posix file lock(range=whole file) for *one* file
on the mounted nfs filesystem. The nfs client acquires the lock
successfully.
The problem:
Now on the server host I unexport the client via unexportfs -u
192.168.2.134:/home. Checked /proc/fs/nfs/exportfs: cleaned-out,no
entries. Remember: client still has /home mounted on his side.
But, when I try to umount /dev/sda1 from /home, I get a "device is busy"
error. Same error even if I try to force the umount.
It is important to note, that I only get the umount problems IF the
client has issued locks. It doesn't matter if the client has open files
on the nfs fs, transferring data, type of lock,etc.
A simple work-around for this problem is to shutdown the nfs subsystem
and restart it. Another way would be if the client unlocks the files.
In both cases I can proceed to umount /home. To me however, such
solutions are unacceptable. I know this much: this problem is with
lockd.
More investigation reveals that knfsd is informing lockd to remove locks
when a *client* is removed. Call path: handle_sys_nfsservctl->
nfsdelclient->exp_delcient->exp_freeclient->nfsd_lockd_unexport->
nlmsvc_invalidate_client. Funny thing is, exportfs in
nfs-utils-1.0.1-pre8 never calls nfsctl() with NFS_DELCLIENT when
unexporting a client+export_point; it only calls nfsctl() with
NFS_UNEXPORT. On the other hand, exportfs does call nfsctl() with
NFS_ADDCLIENT & NFS_EXPORT.
So has anyone come up with a fix where knfsd tells lockd to "remove all
locks on this nfs filesystem/export-point"?
Thanks for any help,
Kashif Shaikh
-------------------------------------------------------
This sf.net email is sponsored by:ThinkGeek
Welcome to geek heaven.
http://thinkgeek.com/sf
_______________________________________________
NFS maillist - [email protected]
https://lists.sourceforge.net/lists/listinfo/nfs
On 19 Jul 2002, Kashif Shaikh wrote:
> Hello everyone,
>
> I'm encountering unmount issues with lockd on stock 2.4.18 kernels. The
> problem:
>
I was experiencing all sorts of badness with my mail spool on an NFS
mounted filesystem. Upgrading the server to 2.4.19-rc1-ac3 seems to have
done the trick. All gone!
Steve
-------------------------------------------------------
This sf.net email is sponsored by:ThinkGeek
Welcome to geek heaven.
http://thinkgeek.com/sf
_______________________________________________
NFS maillist - [email protected]
https://lists.sourceforge.net/lists/listinfo/nfs