Journaled File System or JFS is a 64-bit journaling file system created by IBM. An implementation for the Linux kernel is available as free program under the terms of the GNU General Public License (GPL) In the AIX operating system, there exist two generations of JFS file system that are called JFS (JFS1) and JFS2 respectively.^[1][2] In the other operating systems, such as OS/2 and Linux, only the second generation exists and is called simply JFS.^[3] This should not be confused with JFS in AIX that actually refers to JFS1.