yum snapshot btrfs /home partition

[Dj YB]

Hello,

I have installed a fresh F15 (long story) system, and decided to try the 
btrfs.
while doing a yum update\install\erase\... yum tries to snapshot both the root 
partition and the home partition (both are btrfs), but allways fail.
output as follows:
any help solving that issue is greatly appreciated,
YB.

[root at localhost djyb]# yum install gcalctool
Loaded plugins: fs-snapshot, langpacks, presto, refresh-packagekit
Setting up Install Process
Resolving Dependencies
--> Running transaction check
---> Package gcalctool.x86_64 0:6.0.1-2.fc15 will be installed
--> Finished Dependency Resolution

Dependencies Resolved

===========================================================================================================================================================
 Package                              Arch                              
Version                                    Repository                         
Size
===========================================================================================================================================================
Installing:
 gcalctool                            x86_64                            
6.0.1-2.fc15                               fedora                            
730 k

Transaction Summary
===========================================================================================================================================================
Install       1 Package(s)

Total download size: 730 k
Installed size: 3.7 M
Is this ok [y/N]: y
Downloading Packages:
Setting up and reading Presto delta metadata
Processing delta metadata
Package(s) data still to download: 730 k
gcalctool-6.0.1-2.fc15.x86_64.rpm                                                                                                   
| 730 kB     00:02     
Running rpm_check_debug
Running Transaction Test
Transaction Test Succeeded
Running Transaction
fs-snapshot: snapshotting /: /yum_20111211190728
fs-snapshot: snapshotting /home/: /home/yum_20111211190728
fs-snapshot: snapshotting /tmp/: /tmp/yum_20111211190728
fs-snapshot: snapshotting /var/tmp/: /var/tmp/yum_20111211190728
fs-snapshot: snapshotting /home/: /home/yum_20111211190728


fs-snapshot: error snapshotting /home