mkisofs man page... HUH?

[Ronald F. Guilmette]

Looking at the man page for mkisofs I see the following:


       -r     ....................... If any of the special mode bits are set,
              clear  them,  because  file  locks are not useful on a read-only
              file system, ...

Just curious:  What the bleep have file mode bits got to do with file locking?

I'm personally not aware of any connection between the two.

Somebody please enlighten me.