Hi all When /etc/mtab is a symlink to /proc/mounts, users are still able to mount NFS volumes listed in /etc/fstab with the "user" or "users" option. However, attempting to unmount the same volume fails: umount.nfs: You are not permitted to unmount <mount-point> The /etc/fstab entry is nfssvr:/home/export /home/export nfs users,noauto,hard,bg,intr The kernel doesn't track the "user" or "users" options so they don't appear in /proc/mounts, and thus in /etc/mtab when the latter is a link to the former. However, when /etc/mtab is an ordinary file nfs.mount adds the "user" or "users" option to the entry (fix_opts_string() in utils/mount/mount.c) so the flag is available when /etc/mtab is consulted at unmount time. The util-linux mount tools must track the "user" and "users" options in their own way since mounts which use those tools with these flags work fine. I haven't quite determined where it does this: I thought it might be /run/mount/utab, but that file isn't created on my system (Slackware64 /current) and yet user mounts still generally work. What is the recommended way to unmount NFS volumes which are permitted to be mounted by users via the "user" and "users" options? The only way I can think of is a very careful sudo entry. It would be good though if nfs unmount could work with the "user" and "users" options just like mount does. Regards jonathan
