.RE
After this call the same contents is accessible in two places.
-One can also remount a single file (on a single file).
+One can also remount a single file (on a single file). It's also
+possible to use the bind mount to create a mountpoint from a regular
+directory, for example:
-This call attaches only (part of) a single filesystem, not possible
+.RS
+.br
+.B mount --bind
+.I foo foo
+.RE
+
+The bind mount call attaches only (part of) a single filesystem, not possible
submounts. The entire file hierarchy including submounts is attached
a second place using
+
.RS
.br
.B mount --rbind
.I olddir newdir
.RE
+
or shortoption
+
.RS
.br
.B mount -R
.B The move operation.
.RS
-Since Linux 2.5.1 it is possible to atomically move a mounted tree
+Since Linux 2.5.1 it is possible to atomically move a
+.B mounted tree
to another place. The call is
.RS
.br
.RE
This will cause the contents which previously appeared under olddir to be
accessed under newdir. The physical location of the files is not changed.
+Note that the
+.I olddir
+has to be a mountpoint.
.RE
.B The shared subtrees operations.