Hi If you are going to put shared storage into your snapshots, look at this: http://people.redhat.com/mpatocka/patches/kernel/new-snapshots/devel/ --- this is my snapshot store with Fujita/Daniel's store as a loadable module. So if you are going to do shared storage interface, you must accommodate both of these implementations into it. I still don't understand, how do you intend to patch it on the top of existing snapshot code. Definitely, I wouldn't say that it will be an easy task. Look at the code and have a fun with it. Mikulas -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel