mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-18 10:35:55 +00:00
87 lines
3.0 KiB
Groff
87 lines
3.0 KiB
Groff
.\"
|
|
.\" Copyright (c) 2004 Pawel Jakub Dawidek <pjd@FreeBSD.org>
|
|
.\" All rights reserved.
|
|
.\"
|
|
.\" 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 DEVELOPERS ``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 DEVELOPERS 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.
|
|
.\"
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.Dd January 16, 2004
|
|
.Dt G_WITHER_GEOM 9
|
|
.Os
|
|
.Sh NAME
|
|
.Nm g_wither_geom
|
|
.Nd "destroy geom and related providers and consumers when you get a chance"
|
|
.Sh SYNOPSIS
|
|
.In geom/geom.h
|
|
.Ft void
|
|
.Fn g_wither_geom "struct g_geom *gp" "int error"
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Fn g_wither_geom
|
|
function tells GEOM that geom
|
|
.Fa gp
|
|
is to be destroyed.
|
|
GEOM sets an error on each provider of the given geom (in the
|
|
orphaning process) and waits for a chance to destroy the geom.
|
|
If the access count of any possessed consumer goes to 0, the consumer will be
|
|
detached and destroyed automatically.
|
|
If the last consumer attached to any possessed provider will be detached,
|
|
the provider will be destroyed.
|
|
If there are no more providers nor consumers, the geom will be
|
|
destroyed.
|
|
.Pp
|
|
This is an automatic
|
|
.Dq garbage collect
|
|
to avoid duplicated code in all classes.
|
|
Before it is called, field
|
|
.Va softc
|
|
should be disposed off and set to
|
|
.Dv NULL .
|
|
Note that the
|
|
.Fn g_wither_geom
|
|
function gives no guarantee that the geom will be immediately destroyed, mostly
|
|
because the access counts of the geom's consumers and providers may not be 0.
|
|
That is why calling this function for every geom from a given class is not enough
|
|
to be sure that the class can be unloaded.
|
|
.Sh RESTRICTIONS/CONDITIONS
|
|
The argument
|
|
.Fa error
|
|
must be nonzero.
|
|
.Pp
|
|
The topology lock has to be held.
|
|
.Sh SEE ALSO
|
|
.Xr geom 4 ,
|
|
.Xr DECLARE_GEOM_CLASS 9 ,
|
|
.Xr g_access 9 ,
|
|
.Xr g_attach 9 ,
|
|
.Xr g_bio 9 ,
|
|
.Xr g_consumer 9 ,
|
|
.Xr g_data 9 ,
|
|
.Xr g_event 9 ,
|
|
.Xr g_geom 9 ,
|
|
.Xr g_provider 9 ,
|
|
.Xr g_provider_by_name 9
|
|
.Sh AUTHORS
|
|
.An -nosplit
|
|
This manual page was written by
|
|
.An Pawel Jakub Dawidek Aq pjd@FreeBSD.org .
|