1.\" $NetBSD: dk.4,v 1.13 2021/01/06 18:05:58 wiz Exp $ 2.\" 3.\" Copyright (c) 2006 The NetBSD Foundation, Inc. 4.\" All rights reserved. 5.\" 6.\" This code is derived from software contributed to The NetBSD Foundation 7.\" by Jason R. Thorpe. 8.\" 9.\" Redistribution and use in source and binary forms, with or without 10.\" modification, are permitted provided that the following conditions 11.\" are met: 12.\" 1. Redistributions of source code must retain the above copyright 13.\" notice, this list of conditions and the following disclaimer. 14.\" 2. Redistributions in binary form must reproduce the above copyright 15.\" notice, this list of conditions and the following disclaimer in the 16.\" documentation and/or other materials provided with the distribution. 17.\" 18.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 19.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 20.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 21.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 22.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 28.\" POSSIBILITY OF SUCH DAMAGE. 29.\" 30.\" Jonathan A. Kollasch used vnd(4) as the template for this man page. 31.\" 32.Dd January 6, 2021 33.Dt DK 4 34.Os 35.Sh NAME 36.Nm dk 37.Nd disk partition 38.Pq wedge 39driver 40.Sh SYNOPSIS 41.Cd "options DKWEDGE_AUTODISCOVER" 42.Cd "options DKWEDGE_METHOD_BSDLABEL" 43.Cd "options DKWEDGE_METHOD_GPT" 44.Cd "options DKWEDGE_METHOD_MBR" 45.Cd "options DKWEDGE_METHOD_RDB" 46.Cd "options DKWEDGE_METHOD_APPLE" 47.Sh DESCRIPTION 48The 49.Nm 50driver provides a disk-like interface, or 51.Em wedge , 52to an area of a physical disk. 53Wedges may be configured manually with 54.Xr dkctl 8 55or automatically by the kernel upon the attachment of the physical disk. 56.Pp 57Wedges need to have unique names. 58If a duplicate name is detected during 59auto-discovery, that partition is ignored. 60.Sh KERNEL OPTIONS 61.Bl -tag -width DKWEDGE_METHOD_BSDLABEL 62.It Dv DKWEDGE_AUTODISCOVER 63Automatically detect and configure wedges using any available methods. 64.Pp 65Currently only 66.Dv DKWEDGE_METHOD_GPT 67and 68.Dv DKWEDGE_METHOD_APPLE 69are enabled by default. 70.Pp 71For each partition found, a wedge with a corresponding name is created. 72.It Dv DKWEDGE_METHOD_BSDLABEL 73BSD disklabel detection method. 74For each configured partition in the 75.Xr disklabel 5 76that is not of type 77.Dv FS_UNUSED , 78a wedge is created and named after the 79.Va d_packname 80field followed by 81.Sq \&/ 82and the partition letter 83.So a Sc Ns \&.. Ns So p Sc . 84.Pp 85When the 86.Va d_packname 87is empty or has the value 88.Dq fictitious , 89the regular partition names 90are used as wedge names, i.e. the device name, unit number and 91partition letter, for example 92.Dq wd0a . 93.It Dv DKWEDGE_METHOD_GPT 94Extensible Firmware Interface Globally Unique Identifier Partition Table 95(GPT) detection method. 96.Pp 97For every GPT partition a wedge is created and named after the 98partition label. 99GPT partitions are UTF-16-encoded, this is converted into UTF-8. 100If a partition has no label, its UUID is used instead. 101.It Dv DKWEDGE_METHOD_MBR 102IBM PC-compatible Master Boot Record (MBR) partitioning detection method, 103with support for Extended MBRs. 104.Pp 105For every partition in the MBR a wedge is created and named like a 106regular partition name, i.e. the device name, unit number and a 107partition letter, for example 108.Dq wd0e . 109Primary partitions start with 110.Sq e , 111extended partitions start with 112.Sq i . 113.It Dv DKWEDGE_METHOD_RDB 114Amiga Rigid Disk Block (RDB) partitioning detection method. 115.It Dv DKWEDGE_METHOD_APPLE 116Apple partition map detection method. 117.El 118.Sh FILES 119.Bl -tag -width /dev/XXrXdkX -compact 120.It Pa /dev/{,r}dk* 121.Nm 122device special files. 123.El 124.Sh SEE ALSO 125.Xr config 1 , 126.Xr disklabel 8 , 127.Xr dkctl 8 , 128.Xr fdisk 8 , 129.Xr gpt 8 , 130.Xr MAKEDEV 8 131.Sh HISTORY 132The 133.Nm 134driver first appeared in 135.Nx 3.0 . 136.Sh AUTHORS 137The 138.Nm 139driver was written by 140.An Jason R. Thorpe . 141