Tool that allows you to change type of file system in the lack of backup space
This simple toolset allows you to change type of file system in the lack of backup space. The idea is to use sparse files support of primary filesystem. We create a sparse image of block device, mkfs secondary filesystem on it, mount it, mv files from primary filesystem to mounted image and then map image to the device.
Remapping utility uses some kind of journaling to avoid breakage in case of power failure. It's expected that you have Linux 2.4, glibc 2.2, recent util-linux, fileutils. You can convert from virtually any filesystem type to virtually any one as long as they are both block-oriented and supported by Linux for read/write, and as long as primary filesystem supports sparse files.