The following is a list of odd housekeeping notes for the IMFS.
If the global variable rtems_filesystem_current refers to the node that
we are trying to remove, the node_access element of this structure must be
set to NULL to invalidate it.
If the node was of IMFS_MEMORY_FILE type, free the memory associated
with the memory file before freeing the node. Use the IMFS_memfile_remove()
function.
RTEMS Filesystem Design Guide