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mirror of git://sourceware.org/git/lvm2.git synced 2024-12-22 17:35:59 +03:00
lvm2/tools
David Teigland ef96186add device usage based on devices file
The devices file /etc/lvm/devices/system.devices is a list of
devices that lvm can use.  This is the default system devices
file, which is specified in lvm.conf devices/devicesfile.

The command option --devicesfile <filename> allows lvm to be
used with a different set of devices.  This allows different
applications to use lvm on different sets of devices, e.g.
system devices do not need to be exposed to an application
using lvm on its own devices, and application devices do not
need to be exposed to the system.

In most cases (with limited exceptions), lvm will not read or
use a device not listed in the devices file.  When the devices
file is used, the regex filter is not used, and the filter
settings in lvm.conf are ignored.  filter-deviceid is used
when the devices file is enabled, and rejects any device that
does not match an entry in the devices file.

Set use_devicesfile=0 in lvm.conf or set --devicesfile ""
on the command line to disable the use of a devices file.
When disabled, lvm will see and use any device on the system
that passes the regex filter (and other standard filters.)

A device ID, e.g. wwid or serial number from sysfs, is a
unique ID that identifies a device.  The device ID is
generally independent of the device content, and lvm can
get the device ID without reading the device.
The device ID is used in the devices file as the primary
method of identifying device entries, and is also included
in VG metadata for PVs.

Each device_id has a device_id_type which indicates where
the device_id comes from, e.g. "sys_wwid" means the device_id
comes from the sysfs wwid file.  Others are sys_serial,
mpath_uuid, loop_file, md_uuid, devname.  (devname is the
device path, which is a fallback when no other proper
device_id_type is available.)

filter-deviceid permits lvm to use only devices on the system
that have a device_id matching a devices file entry.  Using
the device_id, lvm can determine the set of devices to use
without reading any devices, so the devices file will constrain
lvm in two ways:
1. it limits the devices that lvm will read.
2. it limits the devices that lvm will use.

In some uncommon cases, e.g. when devices have no unique ID
and device_id has to fall back to using the devname, lvm may
need to read all devices on the system to determine which
ones correspond to the devices file entries.  In this case,
the devices file does not limit the devices that lvm reads,
but it does limit the devices that lvm uses.

pvcreate/vgcreate/vgextend are not constrained by the devices
file, and will look outside it to find the new PV.  They assign
the new PV a device_id and add it to the devices file.  It is
also possible to explicitly add new PVs to the devices file before
using them in pvcreate/etc, in which case these commands would not
need to look outside the devices file for the new device.

vgimportdevices VG looks at all devices on the system to find an
existing VG and add its devices to the devices file.  The command
is not limited by an existing devices file.  The command will also
add device_ids to the VG metadata if the VG does not yet include
device_ids.  vgimportdevices -a imports devices for all accessible
VGs.  Since vgimportdevices does not limit itself to devices in
an existing devices file, the lvm.conf regex filter applies.
Adding --foreign will import devices for foreign VGs, but device_ids
are not added to foreign VGs.  Incomplete VGs are not imported.

The lvmdevices command manages the devices file.  The primary
purpose is to edit the devices file, but it will read PV headers
to find/check PVIDs.  (It does not read, process or modify VG
metadata.)

lvmdevices
. Displays devices file entries.
lvmdevices --check
. Checks devices file entries.
lvmdevices --update
. Updates devices file entries.
lvmdevices --adddev <devname>
. Adds devices_file entry (reads pv header).
lvmdevices --deldev <devname>
. Removes devices file entry.
lvmdevices --addpvid <pvid>
. Reads pv header of all devices to find <pvid>,
  and if found adds devices file entry.
lvmdevices --delpvid <pvid>
. Removes devices file entry.

The vgimportclone command has a new option --importdevices
that does the equivalent of vgimportdevices with the cloned
devices that are being imported.  The devices are "uncloned"
(new vgname and pvids) while at the same time adding the
devices to the devices file.  This allows cloned PVs to be
imported without duplicate PVs ever appearing on the system.

The command option --devices <devnames> allows a specific
list of devices to be exposed to the lvm command, overriding
the devices file.
2021-02-17 15:17:12 -06:00
..
.exported_symbols generate liblvm2cmd exported symbols too 2010-06-25 18:23:10 +00:00
.gitignore tools: add generated headers to .gitignore 2017-03-10 13:13:41 +00:00
args.h device usage based on devices file 2021-02-17 15:17:12 -06:00
cmdnames.h doc: change fsf address 2016-01-21 12:11:37 +01:00
command-lines.in device usage based on devices file 2021-02-17 15:17:12 -06:00
command.c man: more precise UNIT 2020-10-24 01:42:16 +02:00
command.h fix command definition for pvchange -a 2019-06-10 13:43:20 -05:00
commands.h device usage based on devices file 2021-02-17 15:17:12 -06:00
dumpconfig.c lvmconfig: Add options to produce file preamble 2017-08-05 16:23:34 +01:00
errors.h tools: Introduce exit code EINIT_FAILED. 2017-07-26 23:18:03 +01:00
formats.c doc: change fsf address 2016-01-21 12:11:37 +01:00
license.inc pre-release 2017-03-28 16:11:35 +01:00
lv_props.h Allow dm-integrity to be used for raid images 2020-04-15 12:10:32 -05:00
lv_types.h Allow dm-integrity to be used for raid images 2020-04-15 12:10:32 -05:00
lvchange.c lvchange: fix error for foreign vg activation 2020-11-17 09:22:40 -06:00
lvconvert_poll.c lvconvert_poll: ensure LV has snapshot type 2020-09-11 21:47:34 +02:00
lvconvert_poll.h build: Don't generate symlinks in include/ dir 2018-05-14 10:30:20 +01:00
lvconvert.c cachevol: allow forced detaching of damaged or invalid cachevol 2021-02-02 14:31:23 -06:00
lvcreate.c cache: reuse code for metadata min_max 2021-02-01 12:06:13 +01:00
lvdisplay.c process_each_lv: add check_single_lv function 2017-02-13 08:20:10 -06:00
lvextend.c doc: change fsf address 2016-01-21 12:11:37 +01:00
lvm2cmd-static.c lvmcmdlib: lvm2_init_threaded 2020-10-20 22:22:52 +02:00
lvm2cmd.c lvmcmdlib: lvm2_init_threaded 2020-10-20 22:22:52 +02:00
lvm2cmd.h lvmcmdlib: lvm2_init_threaded 2020-10-20 22:22:52 +02:00
lvm2cmdline.h lvmcmdlib: lvm2_init_threaded 2020-10-20 22:22:52 +02:00
lvm-static.c doc: change fsf address 2016-01-21 12:11:37 +01:00
lvm.c lvm: add readline alternative editline 2020-09-29 10:13:24 +02:00
lvmcmdlib.c lvmcmdlib: lvm2_init_threaded 2020-10-20 22:22:52 +02:00
lvmcmdline.c device usage based on devices file 2021-02-17 15:17:12 -06:00
lvmdevices.c device usage based on devices file 2021-02-17 15:17:12 -06:00
lvmdiskscan.c remove unused full filter 2018-12-04 14:06:46 -06:00
lvpoll.c build: Don't generate symlinks in include/ dir 2018-05-14 10:30:20 +01:00
lvreduce.c doc: change fsf address 2016-01-21 12:11:37 +01:00
lvremove.c process_each_lv: add check_single_lv function 2017-02-13 08:20:10 -06:00
lvrename.c toollib: make it possible to also process internal VGs, add 'include_internal' switch to process_each_vg fn 2016-06-20 11:33:42 +02:00
lvresize.c lvextend: refresh shared LV remotely using dlm/corosync 2019-03-21 12:38:20 -05:00
lvscan.c Remove lvmetad 2018-07-11 11:26:42 -05:00
Makefile.in device usage based on devices file 2021-02-17 15:17:12 -06:00
polldaemon.c device usage based on devices file 2021-02-17 15:17:12 -06:00
pvchange.c device usage based on devices file 2021-02-17 15:17:12 -06:00
pvck.c device usage based on devices file 2021-02-17 15:17:12 -06:00
pvcreate.c device usage based on devices file 2021-02-17 15:17:12 -06:00
pvdisplay.c add device hints to reduce scanning 2019-01-15 10:23:47 -06:00
pvmove_poll.c pvmove: add missing synchronization 2019-08-20 12:44:39 +02:00
pvmove_poll.h doc: change fsf address 2016-01-21 12:11:37 +01:00
pvmove.c pvmove: check return value of top_level_lv_name() 2020-09-11 21:43:08 +02:00
pvremove.c pvcreate: call label scan prior to pvcreate_each_device 2019-04-30 14:10:27 -05:00
pvresize.c exported vg handling 2019-06-25 15:39:08 -05:00
pvscan.c device usage based on devices file 2021-02-17 15:17:12 -06:00
reporter.c cleanup: matching declaration order 2020-09-01 17:57:50 +02:00
segtypes.c doc: change fsf address 2016-01-21 12:11:37 +01:00
stub.h Remove vgconvert 2018-06-13 14:14:03 -05:00
tags.c doc: change fsf address 2016-01-21 12:11:37 +01:00
tool.h configure: avoid repeative inclusion of configure.h 2018-12-21 19:19:50 +01:00
toollib.c device usage based on devices file 2021-02-17 15:17:12 -06:00
toollib.h writecache: cachesettings in lvchange and lvs 2020-06-10 12:14:00 -05:00
tools.h device usage based on devices file 2021-02-17 15:17:12 -06:00
vals.h Revert "pvck: dump headers_only to skip metadata text" 2020-05-29 13:26:43 -05:00
vgcfgbackup.c improve reading and repairing vg metadata 2019-06-07 15:54:04 -05:00
vgcfgrestore.c locking: unify global lock for flock and lockd 2019-04-29 13:01:05 -05:00
vgchange.c cov: check for deactivation failure 2020-05-20 15:55:39 +02:00
vgck.c vgck: fix updatemetadata writing different descriptions 2019-10-11 12:57:32 -05:00
vgcreate.c device usage based on devices file 2021-02-17 15:17:12 -06:00
vgdisplay.c tidy: Add missing underscores to statics. 2017-10-18 15:58:13 +01:00
vgexport.c lvmlockd: primarily use vg_is_shared 2018-06-01 13:15:22 -05:00
vgextend.c device usage based on devices file 2021-02-17 15:17:12 -06:00
vgimport.c exported vg handling 2019-06-25 15:39:08 -05:00
vgimportclone.c device usage based on devices file 2021-02-17 15:17:12 -06:00
vgimportdevices.c device usage based on devices file 2021-02-17 15:17:12 -06:00
vgmerge.c remove vg_read_error 2020-04-24 11:14:29 -05:00
vgmknodes.c process_each_lv: add check_single_lv function 2017-02-13 08:20:10 -06:00
vgreduce.c add suggestion message for mirror LVs 2020-01-15 09:46:54 -06:00
vgremove.c exported vg handling 2019-06-25 15:39:08 -05:00
vgrename.c vgrename: fix error value when name exists 2020-04-21 09:33:56 -05:00
vgscan.c locking: unify global lock for flock and lockd 2019-04-29 13:01:05 -05:00
vgsplit.c vgsplit: support for VDO volumes 2020-09-25 22:51:50 +02:00