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+.\"	$NetBSD: xbdback.4,v 1.5 2014/03/18 18:20:39 riastradh Exp $
+.\"
+.\" Copyright (c) 2011 The NetBSD Foundation, Inc.
+.\" All rights reserved.
+.\"
+.\" This code is derived from software contributed to The NetBSD Foundation
+.\" by Jean-Yves Migeon <jym@NetBSD.org>.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+.\" PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+.\" POSSIBILITY OF SUCH DAMAGE.
+.\"
+.Dd June 7, 2011
+.Dt XBDBACK 4 xen
+.Os
+.Sh NAME
+.Nm xbdback
+.Nd Xen backend paravirtualized block device interface
+.Sh SYNOPSIS
+.Cd "pseudo-device xbdback"
+.Sh DESCRIPTION
+The
+.Nm
+interface forms the backend part of the paravirtualized drivers
+used by
+.Tn Xen
+domains to offer a block device interface, similar to a hard disk.
+.Nm
+interfaces are backed either by a physical device directly,
+or an image file mounted through
+.Xr vnd 4 .
+.Pp
+All
+.Nm
+interfaces follow the
+.Dq xbdbackXiY
+naming convention, where
+.Sq X
+represents the guest domain identifier, and
+.Sq Y
+an arbitrary identifier.
+This identifier is usually associated to the device node as seen
+by the guest using
+.Xr major 3
+and
+.Xr minor 3
+numbers.
+For example, identifier
+.Do 769 Dc Po 0x301 Pc
+means major
+.Em 3
+and minor
+.Em 1 ,
+identified as
+.Dq hda1
+under Linux convention.
+For
+.Nx ,
+the guest device name specified in the guest configuration file
+does not matter, and can be chosen arbitrarily.
+.Pp
+A
+.Nm
+interface will appear as a
+.Xr xbd 4
+block device inside a
+.Nx
+guest domain.
+In the XenStore,
+.Nm xbd
+and
+.Nm xbdback
+are identified by
+.Dq vbd
+(virtual block device)
+entries.
+.Sh DIAGNOSTICS
+.Bl -diag
+.It "xbd backend: attach device %s (size %d) for domain %d"
+Gives the device used as
+.Nm
+interface for the given guest domain, and its size, in bytes.
+.It "xbd backend 0x%x for domain %d using event channel %d, protocol %s"
+Gives the backend identifier, guest domain ID, event channel ID, and
+protocol used for block level communication.
+.It "xbdback %s: can't VOP_OPEN device 0x%x: %d"
+When this message appears in the system message buffer with error 16
+.Po Er EBUSY Pc ,
+the device is likely to be already mounted.
+It must be unmounted first, as the system will refuse to open
+it a second time.
+.El
+.Sh SEE ALSO
+.Xr vnd 4 ,
+.Xr xbd 4 ,
+.Xr xenbus 4
+.Sh HISTORY
+The
+.Nm
+driver first appeared in
+.Nx 4.0 .
+.Sh AUTHORS
+.An -nosplit
+The
+.Nm
+driver was written by
+.An Manuel Bouyer Aq Mt bouyer@NetBSD.org .