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+.\"	$NetBSD: xbd.4,v 1.4 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 January 8, 2011
+.Dt XBD 4 xen
+.Os
+.Sh NAME
+.Nm xbd
+.Nd Xen frontend paravirtualized block device interface
+.Sh SYNOPSIS
+.Cd "xbd* at xenbus?"
+.Sh DESCRIPTION
+The
+.Nm
+interface forms the frontend part of the paravirtualized drivers
+used by
+.Tn Xen
+guest domains to have a block device interface.
+.Pp
+From a guest point of view,
+.Nm
+is similar to a hard disk, and can be treated in the very same way
+regarding partitioning, file systems creation and usage, and mounting.
+By default, a
+.Nx
+guest domain will assume that
+.Dq xbd0a
+serves as the root file system.
+.Pp
+When the host is
+.Nx ,
+the
+.Nm
+interface is backed by a
+.Xr xbdback 4
+interface.
+In the XenStore,
+.Nm xbd
+and
+.Nm xbdback
+are identified by
+.Dq vbd
+(virtual block device)
+entries.
+.Sh DIAGNOSTICS
+.Bl -diag
+.It "xbd%d: using event channel %d"
+Specifies the event channel used by this
+.Nm
+interface.
+.It "xbd%d: %s MB, %d bytes/sect x %u sectors"
+Gives the total size of the
+.Nm
+block device, its sector size and total number of sectors.
+.It "xbd%d: WARNING: cache flush not supported by backend"
+The backend driver associated with this
+.Nm
+device does not support cache flushing operation.
+This can be problematic for file system operations that require
+cache sync to avoid data loss or corruption.
+.El
+.Sh SEE ALSO
+.Xr xbdback 4 ,
+.Xr xenbus 4 ,
+.Xr dkctl 8
+.Sh HISTORY
+The
+.Nm
+driver first appeared in
+.Nx 3.0 .
+.Sh AUTHORS
+.An -nosplit
+The
+.Nm
+driver was written by
+.An Manuel Bouyer Aq Mt bouyer@NetBSD.org .