201 lines
4.9 KiB
Groff
201 lines
4.9 KiB
Groff
.\"
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.\" Copyright (c) 2004 Pawel Jakub Dawidek <pjd@FreeBSD.org>
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY EXPRESS OR
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.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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.\" IN NO EVENT SHALL THE DEVELOPERS BE LIABLE FOR ANY DIRECT, INDIRECT,
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.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd January 16, 2004
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.Dt g_geom 9
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.Os
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.Sh NAME
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.Nm g_new_geomf ,
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.Nm g_destroy_geom
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.Nd "geom management"
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.Sh SYNOPSIS
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.In geom/geom.h
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.Ft "struct g_geom *"
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.Fn g_new_geomf "struct g_class *mp" "const char *fmt" ...
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.Ft void
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.Fn g_destroy_geom "struct g_geom *gp"
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.Sh DESCRIPTION
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The geom (do not confuse
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.Dq geom
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with
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.Dq GEOM )
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is an instance of a GEOM class.
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For example: in a typical i386 FreeBSD system, there will be one geom
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of class MBR for each disk.
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The geom's name is not really important, it is only used in the XML
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dump and for debugging purposes.
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There can be many geoms with the same name.
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.Pp
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The
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.Fn g_new_geomf
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function creates a new geom, which will be an instance of the class
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.Fa mp .
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The geom's name is created in a printf-like way from the rest of the arguments.
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.Pp
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The
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.Fn g_destroy_geom
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function destroys the given geom immediately and cancels all related pending
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events.
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.Pp
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The
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.Vt g_geom
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structure
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contains fields that should be set by the caller after geom creation, but before
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creating any providers or consumers related to this geom (not all are required):
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.Bl -inset -offset indent
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.It Vt "g_start_t *" Va start
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Pointer to a function used for I/O processing.
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.It Vt "g_spoiled_t *" Va spoiled
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Pointer to a function used for consumers spoiling.
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.It Vt "g_dumpconf_t *" Va dumpconf
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Pointer to a function used for configuration in XML format dumping.
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.It Vt "g_access_t *" Va access
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Pointer to a function used for access control.
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.It Vt "g_orphan_t *" Va orphan
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Pointer to a function used to inform about orphaned consumer.
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.It Vt "g_ioctl_t *" Va ioctl
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Pointer to a function used for handling ioctl requests.
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.It Vt "void *" Va softc
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Field for private use.
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.El
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.Sh RESTRICTIONS/CONDITIONS
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If you intend to use providers in this geom you must set field
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.Va start
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of your geom.
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.Pp
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If you are planning to use consumers in your geom you must set fields
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.Va orphan
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and
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.Va access
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for it.
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.Pp
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.Fn g_new_geomf :
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.Bl -item -offset indent
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.It
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Class
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.Fa mp
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must be valid (registered in GEOM).
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.It
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The topology lock has to be held.
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.El
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.Pp
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.Fn g_destroy_geom :
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.Bl -item -offset indent
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.It
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The geom can not posses any providers.
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.It
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The geom can not posses any consumers.
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.It
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The topology lock has to be held.
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.El
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.Sh RETURN VALUES
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.Fn g_new_geomf
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returns a pointer to the newly created geom.
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.Sh EXAMPLES
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Create an example geom.
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.Bd -literal -offset indent
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static struct geom *
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g_example_start(struct bio *bp)
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{
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[...]
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}
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static void
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g_example_orphan(struct g_consumer *cp)
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{
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g_topology_assert();
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[...]
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}
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static void
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g_example_spoiled(struct g_consumer *cp)
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{
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g_topology_assert();
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[...]
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}
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static void
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g_example_access(struct g_provider *pp, int dr, int dw, int de)
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{
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[...]
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}
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static struct g_geom *
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create_example_geom(struct g_class *myclass)
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{
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struct g_geom *gp;
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g_topology_lock();
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gp = g_new_geomf(myclass, "example_geom");
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g_topology_unlock();
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gp->start = g_example_start;
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gp->orphan = g_example_orphan;
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gp->spoiled = g_example_spoiled;
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gp->access = g_example_access;
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gp->softc = NULL;
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return (gp);
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}
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static int
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destroy_example_geom(struct g_geom *gp)
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{
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g_topology_lock();
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if (!LIST_EMPTY(&gp->provider) ||
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!LIST_EMPTY(&gp->consumer)) {
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g_topology_unlock();
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return (EBUSY);
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}
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g_destroy_geom(gp);
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g_topology_unlock();
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return (0);
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}
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.Ed
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.Sh SEE ALSO
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.Xr DECLARE_GEOM_CLASS 9 ,
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.Xr geom 4 ,
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.Xr g_access 9 ,
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.Xr g_attach 9 ,
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.Xr g_bio 9 ,
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.Xr g_consumer 9 ,
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.Xr g_data 9 ,
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.Xr g_event 9 ,
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.Xr g_provider 9 ,
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.Xr g_provider_by_name 9 ,
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.Xr g_wither_geom 9
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.Sh AUTHORS
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.An -nosplit
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This manual page was written by
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.An Pawel Jakub Dawidek Aq pjd@FreeBSD.org .
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