I have successfully mounted HFS+ volume under Linux, but when I try to read HFS+ extended security attribute on the file I get the error "Operation not supported":
[root@localhost hfsvol]# getfattr --name="com.apple.system.cprotect" file.db
file.db: com.apple.system.cprotect: Operation not supported
[root@localhost hfsvol]#
Why this happens? I know that the file 'file.db' exactly has the attribute "com.apple.system.cprotect".