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
Check Out this Related Man Page
glutLayerGet(3GLUT) GLUT glutLayerGet(3GLUT)NAME
glutLayerGet - retrieves GLUT state pertaining to the layers of the current window.
SYNTAX
int glutLayerGet(GLenum info);
ARGUMENTS
info Name of device information to retrieve.
GLUT_OVERLAY_POSSIBLE
Whether an overlay could be established for the current window given the current initial display mode. If false, glutEstablishOver-
lay will fail with a fatal error if called.
GLUT_LAYER_IN_USE
Either GLUT_NORMAL or GLUT_OVERLAY depending on whether the normal plane or overlay is the layer in use.
GLUT_HAS_OVERLAY
If the current window has an overlay established.
GLUT_TRANSPARENT_INDEX
The transparent color index of the overlay of the current window; negative one is returned if no overlay is in use.
GLUT_NORMAL_DAMAGED
True if the normal plane of the current window has damaged (by window system activity) since the last display callback was trig-
gered. Calling glutPostRedisplay will not set this true.
GLUT_OVERLAY_DAMAGED
True if the overlay plane of the current window has damaged (by window system activity) since the last display callback was trig-
gered. Calling glutPostRedisplay or glutPostOverlayRedisplay will not set this true. Negative one is returned if no overlay is in
use.
DESCRIPTION
glutLayerGet retrieves GLUT layer information for the current window represented by integers. The info parameter determines what type of
layer information to return.
SEE ALSO
glutEstablishOverlay, glutUseOverlay, glutCreateWindow, glutSetColor
AUTHOR
Mark J. Kilgard (mjk@nvidia.com)
GLUT 3.7 glutLayerGet(3GLUT)
Hi Guys,
I'm a windows user..........
I got a hard drive that windows recognize as a RAS FS ....and I don't know what is RAW file system ... can you help me guys ???
is there any way that I can access the data written on this drive from windows 2000 operations system ???
Thanks & Best... (1 Reply)
hello,
i m new user in this forum....i need ur help :confused: . Can anyone tell me which Operating System from Linux, Unix,FreeBSD,MacOSX, and Solaris.... has the best file System? and Y it is best for this OS?
regards.... (1 Reply)
How can I specify and the -O (overlay option) in the vfstab ?
Also can you specify the overlay option to the mount options for a Vertias cluster NFS service group ? (0 Replies)