A system for managing a file system. In response to a user selecting an image of the file system to perform a rollback operation, each data block in the file system that is owned by the image is searched for. Then, it is determined whether a data block owned by the image is marked in a first map and...http://www.google.se/patents/US8190657?utm_source=gb-gplus-sharePatent US8190657 - Method and system for handling reallocated blocks in a file system
