add loop device backing file in udev database

Hi,

Since kernel 2.6.37, some infos are available in /sys for associated 
loop devices, especially the backing file. Is it poosible to introduce 
the BACKING_FILE variable for associated loop devices ?

This sample

ACTION=="add|change", \
         KERNEL=="loop?*", \
         SUBSYSTEM=="block", \
         TEST=="%S/block/%k/loop/backing_file", \
         PROGRAM=="/bin/cat %S/block/%k/loop/backing_file", \
         ENV{BACKING_FILE}="%c"

works fine.

I have already send a bug report to the Debian maintainer 
(http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=671546) who has 
recommended me to directly propose this change to the upstream 
maintainer.

Thanks
quidame
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