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SubjectRe: NFS/RPC problems w/ 2.2.12 + a feature suggestion for NFS/remounting
	From: I Lee Hetherington <ilh@sls.lcs.mit.edu>

I've got umount from mount-2.9u-4_nfsv3_0.3, and umount -f has never
worked for me either. With a single shell whose pwd is in the mounted
directory, I get the following error:

umount2: Device or resource busy
umount: /tmp/mnt: device is busy

Having said that, Red Hat 6.1's shutdown script kills programs using the
mount point, and then umounts OK, but umount -f by itself is definitely
not enough.

There can be local reasons and remote reasons that the umount fails.
The purpose of umount2 is to force the umount in case the remote system
is not responding. It will not force anything if the local kernel still
uses the mount.

Andries

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