That was SCO's claim. In fact, the JFS in Linux derives from the OS/2 version of JFS, which was developed by a different team within IBM, without reference to the AIX source code so the Linux version of JFS has nothing to do with anything that SCO might have had rights to.
This doesn't detract from the fact that, whatever its technical merits, JFS's market share in the Linux world is considerably lower than that of competing file systems such as the ext family or SGI's XFS.
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