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lofs(7FS) File Systems file on that file system. The loopback file system works by shadowing directories of the underlying file system. Because no other file types are shadowed, the loopback file system can not enforce read-only access to non-directory files located on a read-only mounted loopback file system. Thus, write access to regular files located on a loopback mounted file system is determined by the underlying file system. In addition, the loopback file system can not correctly determine whether a loopback mounted file system can be unmounted or not. It can only detect when a directory is active or not, not when a file within a directory is active. Thus, a loopback mounted file system may be unmounted if there are no active directories on the file system, even if there are open files on the file system. 304 SunOS 5.8 Last modified 22 Apr 1996
