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SubjectRe: BUG REPORT: kernel nfs between 2.4.19-pre2 (server) and 2.2.21-pre3 (client)
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>>>>> " " == Stephan von Krawczynski <skraw@ithnet.com> writes:

> Hello all, I just upgraded a host from 2.2.19 to 2.2.21-pre3
> and discovered a problem with kernel nfs. Setup is this:
> knfs-server is 2.4.19-pre2 knfs-client is 2.2.21-pre3
> First mount some fs (mountpoint /backup). Then go and mount
> some other fs from the same server (mountpoint /mnt), do some
> i/o on the latter and umount it again. Now try to access
> /backup. You see:
> 1) /backup (as a fs) vanished, you get a stale nfs handle.
> 2) umount /backup; mount /backup does not work. client tells
> "permission denied". server tells "rpc.mountd: getfh failed:
> Operation not permitted"
By 'some fs' do you mean ext2?

Not all filesystems work well with knfsd when things start to drop out
of the (d|i)caches. In particular things like /backup == VFAT might
give the above behaviour, since VFAT does not know how to map the NFS
file handles into on-disk inodes.
Cheers,
Trond
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