VERITAS File System 4.1 Administrator's Guide

File Change Log
The File Change Log File
Chapter 8132
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 135" ).