umount problem with trailing slashes

[Bjoern Voigt]

Binary package hint: util-linux

The umount program can not unmount CIFS shares if the CIFS address has no a trailing slash and if the "user" option is enabled.

One example:

From /etc/fstab:
//linux/steve /media/test cifs defaults,user,user=steve 0 0

$ mount /media/test
Password:

$ mount | grep /media/test
//linux/steve/ on /media/test type cifs (rw,mand,nosuid,nodev,user=steve)

$ umount /media/test
umount: /media/test mount disagrees with the fstab

After some searching, I found that "//linux/steve/" from "mount" (or /etc/mtab or /proc/mounts) has a trailing slash, but "//linux/steve" from /etc/fstab has no trailing slash. Anyway mounting as normal user works, but unmounting does not work. As a workaround, I can add a trailing slash to the entry in /etc/fstab:

//linux/steve/ /media/test cifs defaults,user,user=steve 0 0

I think, that "umount" should be more tolerant with trailing slashes. The canonicalize function currently does not handle the problem right.

I tested with
    mount from util-linux-ng 2.17.2 (with libblkid and selinux support) - from Ubuntu 10.10
and with
    mount from util-linux-ng 2.17.2 (with libblkid support) - from Launchpad (with util-linux_2.17.2-3.3ubuntu1.diff.gz)