GFS  4.2.0
About: The Global File System (GFS) is a shared disk cluster file system for Linux. GFS supports journaling and recovery from client failures. GFS cluster nodes physically share the same storage by means of Fibre Channel or shared SCSI devices.
  Fossies Dox: GFS-4.2.0.tar.gz  ("inofficial" and yet experimental doxygen-generated source code documentation)  

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GFS Documentation