Veritas File System 4.1 Administrator's Guide (HP-UX 11i v3, February 2007)

File Change Log
The File Change Log File
Chapter 8116
The File Change Log File
FCL stores changes in a sparse file in the file system namespace. The FCL log file is always located in
mount_point/lost+found/changelog. The FCL file behaves like a regular file, but some operations
are prohibited.The standard system calls open(2), lseek(2), read(2) and close(2) can access
the data in the FCL. The system calls write(2), mmap(2) and rename(2) are not allowed.
The FCL log file contains both the information about the FCL (stored in the FCL superblock), and the
changes to files and directories in the file system, stored as FCL records. Details on the structure and
semantics of the FCL superblock and FCL records, and the types of changes trackedby the FCL, are located
in the header file /opt/VRTSvxfs/include/fcl.h (See "“File Change Log Programmatic Interface”
on page 119" ).