1.\"- 2.\" Copyright (c) 2010 Edward Tomasz Napierala 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 13.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 14.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 17.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23.\" SUCH DAMAGE. 24.\" 25.Dd May 18, 2015 26.Dt GMOUNTVER 8 27.Os 28.Sh NAME 29.Nm gmountver 30.Nd "control utility for disk mount verification GEOM class" 31.Sh SYNOPSIS 32.Nm 33.Cm create 34.Op Fl v 35.Ar prov ... 36.Nm 37.Cm destroy 38.Op Fl fv 39.Ar name 40.Nm 41.Cm list 42.Nm 43.Cm status 44.Op Fl s Ar name 45.Nm 46.Cm load 47.Op Fl v 48.Nm 49.Cm unload 50.Op Fl v 51.Sh DESCRIPTION 52The 53.Nm 54utility is used to control the mount verification GEOM class. 55When configured, it passes all the I/O requests to the underlying provider. 56When the underlying provider disappears - for example because the disk device 57got disconnected - it queues all the I/O requests and waits for the provider 58to reappear. 59When that happens, it attaches to it and sends the queued requests. 60.Pp 61The first argument to 62.Nm 63indicates an action to be performed: 64.Bl -tag -width ".Cm destroy" 65.It Cm create 66Enable mount verification for the given provider. 67If the operation succeeds, a new GEOM provider will be created using the 68given provider's name with a 69.Ql .mountver 70suffix. 71The kernel module 72.Pa geom_mountver.ko 73will be loaded if it is not loaded already. 74.It Cm destroy 75Destroy 76.Ar name . 77.It Cm list 78See 79.Xr geom 8 . 80.It Cm status 81See 82.Xr geom 8 . 83.It Cm load 84See 85.Xr geom 8 . 86.It Cm unload 87See 88.Xr geom 8 . 89.El 90.Pp 91Additional options: 92.Bl -tag -width indent 93.It Fl f 94Force the removal of the specified mountver device. 95.It Fl v 96Be more verbose. 97.El 98.Sh SYSCTL VARIABLES 99The following 100.Xr sysctl 8 101variables can be used to control the behavior of the 102.Nm MOUNTVER 103GEOM class. 104The default value is shown next to each variable. 105.Bl -tag -width indent 106.It Va kern.geom.mountver.debug : No 0 107Debug level of the 108.Nm MOUNTVER 109GEOM class. 110This can be set to a number between 0 and 3 inclusive. 111If set to 0 minimal debug information is printed, and if set to 3 the 112maximum amount of debug information is printed. 113.It Va kern.geom.mountver.check_ident : No 1 114This can be set to 0 or 1. 115If set to 0, 116.Nm 117will reattach to the device even if the device reports a different disk ID. 118.El 119.Sh EXIT STATUS 120Exit status is 0 on success, and 1 if the command fails. 121.Sh SEE ALSO 122.Xr geom 4 , 123.Xr geom 8 124.Sh HISTORY 125The 126.Nm 127utility appeared in 128.Fx 9.0 . 129.Sh AUTHORS 130.An Edward Tomasz Napierala Aq Mt trasz@FreeBSD.org 131