JFFS2 is intended to be used on raw controller-less flash an thus have to solve many problems that are more efficiently done in hardware. So it's probably only

JFFS2 is intended to be used on raw controller-less flash an thus have to solve many problems that are more efficiently done in hardware. So it's probably only useful in embedded systems. Running normal filesystem on raw flash is good way to make it unusable in few days of light use. In fact, JFFS2 works by scanning all the storage on mount and having it all in RAM, that causes it's problems with large volumes (slow mounts and also large memory use). In embedded systems, for which it is intended, mounting the volume is rare operation and volumes are generally small, also typical embedded systems running linux has more RAM than Flash.