fsid change of ZFS?
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Hi,
I have experienced "Stale NFS file handle" issue when switching
between oldnfs and newnfs on a CURRENT box (NFS server exporting ZFS
mountpoints). The cause was that fsid was changed in the following
conditions and not in the NFS subsystem itself, but I am wondering if
these are expected behavior...
First, I tried the following configurations of NFS and ZFS, and saw
if fsid of the same mountpoint (a mounted ZFS dataset) changed or
not by using statfs(2):
compile opts kld module fsid[0:1] kld loaded by
----------------------------------------------------------------------------
NFSSERVER+NFSCLIENT zfs 865798fa:8346ef02 loader
NFSSERVER+NFSCLIENT zfs 865798fa:8346ef07 kldload(8)
NFSSERVER+NFSCLIENT+
NFSD+NFSCL zfs 865798fa:8346ef03 loader
NFSSERVER+NFSCLIENT+
NFSD+NFSCL zfs 865798fa:8346ef08 kldload(8)
NFSSERVER+NFSCLIENT nfsd+nfscl+zfs 865798fa:8346ef08 loader
----------------------------------------------------------------------------
The fsid seems to depend on the module loading order of ZFS. Even on
a running system, the following procedure changed the fsid, for
example:
1. Boot with a kernel with NFSSERVER+NFSCLIENT.
2. Load zfs.ko and opensolaris.ko by loader.
3. Check fsid of a ZFS mountpoint --> 865798fa:8346ef02
4. Unload zfs.ko and opensolaris.ko, and then do zfs umount -a.
5. Load zfs.ko and opensolaris.ko by kldload(8), and do zfs mount -a.
6. Check fsid of the same mountpoint --> 865798fa:8346ef08
Is this by design or not? While testing the above configurations,
fsid of a UFS mountpoint was not changed (as expected).
-- Hiroki
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