mount.aufs doesn't work for directory any more

[T o n g <mlist4suntong@yahoo.com>]

Hi,

I used to be able to use mount.aufs to unify several directories and 
provide a merged single directory.

>From mount.aufs man page, I should still be able to do that:

       # mount -v -t aufs br:/day0:/base none /u
       none on /u type aufs (rw,xino=/day0/.aufs.xino,br:/day0=rw:/
base=ro)
       # mount -v -o remount,\
            prepend:/day1,\
            xino=/day1/xino,\
            mod:/day0=ro,\
            del:/day0 \
            /u
       none on /u type aufs (rw,xino=/day1/xino,br:/day1=rw:/base=ro)

But seems to me, now mount.aufs insists to work on mount point only. 
I.e., the first mount command will give me error: 

 /sbin/mount.aufs:plink.c:223: AUFS_CTL_PLINK_MAINT: Inappropriate ioctl 
for device

the 2nd: 

 mount: can't find /u in /etc/fstab or /etc/mtab

Please help. 

PS. my aufs-tools

$ apt-cache policy aufs-tools
aufs-tools:
  Installed: 20100601-1
  Candidate: 20100601-1
  Version table:
 *** 20100601-1 0
        360 http://cdn.debian.net testing/main Packages
         50 http://cdn.debian.net unstable/main Packages
        100 /var/lib/dpkg/status

thanks

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