do peers communicate via protocol?

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LEARN ABOUT NETBSD

mount_overlay

MOUNT_OVERLAY(8)					    BSD System Manager's Manual 					  MOUNT_OVERLAY(8)

NAME

     mount_overlay -- mount an overlay filesystem; demonstrate the use of an overlay file system layer

SYNOPSIS

     mount_overlay [-o options] /overlay mount-point

DESCRIPTION

     The mount_overlay command creates an overlay layer, interposing the overlay filesystem between the over-mounted file store and future path-
     name lookups.

     A different device number for the virtual copy is returned by stat(2), but in other respects it is indistinguishable from the original.

     The mount_overlay filesystem differs from the null filesystem in that the mount_overlay filesystem does not replicate the sub-tree, it places
     itself between the sub-tree and all future access.

     The overlay layer has two purposes.  First, it serves as a demonstration of layering by providing a layer which does nothing other than
     insert itself over the over-mounted file system.  Second, the overlay layer can serve as a prototype layer.  Since it provides all necessary
     layer framework, new file system layers which need to block access to the overlayed file system can be created very easily by starting with
     an overlay layer.

     The internal operation of the overlay layer is identical to that of the null layer.  See its documentation for details.

SEE ALSO

     mount(8), mount_null(8)

     UCLA Technical Report CSD-910056, Stackable Layers: an Architecture for File System Development.

HISTORY

     The mount_overlay utility first appeared in NetBSD 1.5.

BSD
								 January 18, 2000							       BSD

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