Add a geom class to map Linux LVM logical volumes.
The logical disks will appear as /dev/lvm/<vol group>-<logical vol>, for instance /dev/lvm/vg0-home. GLVM currently supports linear stripes with segments on multiple physical disks. The metadata is read only, logical volumes can not be allocated or resized. Reviewed by: Ivan Voras
This commit is contained in:
Andrew Thompson
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svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=176166
88
share/man/man4/geom_lvm.4
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88
share/man/man4/geom_lvm.4
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.\"
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.\" Copyright (c) 2008 Andrew Thompson
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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 AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd February 11, 2008
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.Os
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.Dt GEOM_LVM 4
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.Sh NAME
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.Nm geom_lvm
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.Nd "GEOM based Linux LVM logical volume mapping"
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.Sh SYNOPSIS
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To compile this driver into the kernel,
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place the following line in your
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kernel configuration file:
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.Bd -ragged -offset indent
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.Cd "options GEOM_LVM"
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.Ed
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.Pp
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Alternatively, to load the driver as a
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module at boot time, place the following line in
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.Xr loader.conf 5 :
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.Bd -literal -offset indent
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geom_lvm_load="YES"
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.Ed
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.Sh DESCRIPTION
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The
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.Nm
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framework provides support for mapping Linux LVM volumes to GEOM providers.
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.Nm
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currently supports linear stripes with segments on one or more physical disks.
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The parser is able to read LVM2 Text Format metadata, the logical volumes will
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be assembled and made available under
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.Pa /dev/lvm/ .
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The metadata is read only, logical volumes can not be allocated or resized.
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To view which
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.Nm
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devices are available:
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.Bd -literal -offset indent
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# geom lvm list
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Geom name: vg1
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Providers:
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1. Name: lvm/vg1-home
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Mediasize: 4294967296 (4.0G)
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Sectorsize: 512
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Mode: r0w0e0
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2. Name: lvm/vg1-logs
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Mediasize: 4294967296 (4.0G)
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Sectorsize: 512
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Mode: r0w0e0
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Consumers:
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1. Name: ad0s1
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Mediasize: 80023716864 (75G)
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Sectorsize: 512
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Mode: r0w0e0
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.Ed
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.Pp
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.Sh SEE ALSO
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.Xr GEOM 4 ,
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.Xr geom 8 ,
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.Sh AUTHORS
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.An -nosplit
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The
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.Nm
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driver was written by
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.An "Andrew Thompson" Aq thompsa@FreeBSD.org .
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1177
sys/geom/lvm/g_lvm.c
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1177
sys/geom/lvm/g_lvm.c
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File diff suppressed because it is too large
Load Diff
113
sys/geom/lvm/g_lvm.h
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113
sys/geom/lvm/g_lvm.h
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@ -0,0 +1,113 @@
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/*-
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* Copyright (c) 2008 Andrew Thompson <thompsa@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 AUTHORS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#define G_LVM_DEBUG(lvl, ...) do { \
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if (g_lvm_debug >= (lvl)) { \
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printf("GEOM_LVM"); \
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if (g_lvm_debug > 0) \
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printf("[%u]", lvl); \
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printf(": "); \
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printf(__VA_ARGS__); \
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printf("\n"); \
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} \
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} while (0)
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#define G_LVM_CLASS_NAME "LVM"
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#define G_LVM_NAMELEN 128
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#define G_LVM_UUIDLEN 40
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#define G_LVM_MAGIC "\040\114\126\115\062\040\170\133" \
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"\065\101\045\162\060\116\052\076"
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struct g_lvm_label {
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uint64_t ll_sector;
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uint32_t ll_crc;
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uint32_t ll_offset;
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char ll_uuid[G_LVM_UUIDLEN];
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uint64_t ll_size;
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uint64_t ll_pestart;
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uint64_t ll_md_offset;
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uint64_t ll_md_size;
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};
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struct g_lvm_metadata {
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uint32_t md_csum;
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uint32_t md_version;
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uint64_t md_start;
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uint64_t md_size;
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uint64_t md_reloffset;
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uint64_t md_relsize;
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struct g_lvm_vg *md_vg;
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};
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struct g_lvm_lv {
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LIST_ENTRY(g_lvm_lv) lv_next;
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struct g_lvm_vg *lv_vg;
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char lv_name[G_LVM_NAMELEN];
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char lv_uuid[G_LVM_UUIDLEN];
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int lv_sgcount;
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int lv_sgactive;
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struct g_provider *lv_gprov;
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int lv_extentcount;
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LIST_HEAD(, g_lvm_segment) lv_segs;
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int lv_numsegs;
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struct g_lvm_segment *lv_firstsg;
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};
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struct g_lvm_pv {
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LIST_ENTRY(g_lvm_pv) pv_next;
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struct g_lvm_vg *pv_vg;
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char pv_name[G_LVM_NAMELEN];
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char pv_uuid[G_LVM_UUIDLEN];
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size_t pv_size;
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off_t pv_start;
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int pv_count;
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struct g_provider *pv_gprov;
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struct g_consumer *pv_gcons;
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};
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struct g_lvm_segment {
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LIST_ENTRY(g_lvm_segment) sg_next;
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int sg_start;
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int sg_end;
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int sg_count;
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char sg_pvname[G_LVM_NAMELEN];
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struct g_lvm_pv *sg_pv;
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int sg_pvstart;
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off_t sg_pvoffset;
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};
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struct g_lvm_vg {
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LIST_ENTRY(g_lvm_vg) vg_next;
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char vg_name[G_LVM_NAMELEN];
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char vg_uuid[G_LVM_UUIDLEN];
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size_t vg_extentsize;
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int vg_sectorsize;
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struct g_geom *vg_geom;
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LIST_HEAD(, g_lvm_pv) vg_pvs;
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LIST_HEAD(, g_lvm_lv) vg_lvs;
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};
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