Patent ID: 8290911

Claim:
A method comprising: in response to a request to copy a source file from a source filesystem to a destination filesystem, retrieving file mapping information corresponding to the source file, wherein the file mapping information is stored in a source filesystem map, the source filesystem accesses a source logical volume, the source logical volume maps to a deduplication storage area, the destination filesystem accesses a destination logical volume, wherein the destination logical volume maps to the deduplication storage area, and the source file comprises one or more data blocks stored in a first plurality of physical block locations in the deduplication storage area; allocating a destination file in the destination filesystem, based on the file mapping information, wherein the allocating comprises allocating a second plurality of logical block locations in the destination logical volume; and mapping the destination file to the one or more data blocks, wherein the destination file comprises the one or more data blocks, the mapping the destination file is performed without copying the one or more data blocks to the destination file, and the mapping the destination file comprises modifying metadata associated with the first plurality of physical block locations.