acl problem

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What steps will reproduce the problem?
1. install Debian 6.0.6 (amd64) (on OpenVZ) + SDFS 1.1.8 (sdfs-1.1.8_amd64.deb)
2. mkfs.sdfs --volume-name=sdfs_vol1 --volume-capacity 16GB
3. mkdir -p /mnt/sdfs && cd /mnt/sdfs
4. mount.sdfs -v sdfs_vol1 -m /mnt/sdfs -o 
default_permissions,direct_io,big_writes,allow_other,fsname=sdfs1
5. touch test1
6. chown root:root test1
7. chmod 640 test1
6. setfacl -m u:some_user:rw test1
7. su - some_user
8. echo "test" >>/mnt/sdfs/test1

-- What is the expected output? What do you see instead?
I see an error:
-su: /mnt/sdfs/test1: Permission denied

-- What version of the product are you using? On what operating system?
Debian 6.0.6 (amd64) running on OpenVZ, SDFS 1.1.8 

Original issue reported on code.google.com by soalhn on 11 Oct 2012 at 11:24

[GoogleCodeExporter]

[deleted comment]

[GoogleCodeExporter]

$ getfacl /mnt/sdfs/test1
getfacl: Removing leading '/' from absolute path names
# file: mnt/sdfs/test1
# owner: root
# group: root
user::rw-
user:831:rw-
group::r--
mask::rw-
other::r--

$ id some_user
uid=1000(some_user) gid=1000(some_user) 
groups=1000(some_user),27(sudo),50(staff),100(users)

Original comment by soalhn on 11 Oct 2012 at 11:42