pedrocr's comment above suggests a good solution: 1. Copy each file from the source volume to a single directory (e.g. /tmp) on the target volume, named for th

pedrocr's comment above suggests a good solution: 1. Copy each file from the source volume to a single directory (e.g. /tmp) on the target volume, named for the source volume inode number. (edit: I suggest using a hierarchy of dirs to avoid the "too many dentry's" slowdown) 2. If the file has already been copied, it will already exist in /tmp - looking up the inode is a vanilla directory lookup 3. Create a hard link from /tmp to the actual path of the file 4. When all the files have been created on the target volume, delete the inode numbers in /tmp