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The LVM devices file lists devices that lvm can use. The default
file is /etc/lvm/devices/system.devices, and the lvmdevices(8)
command is used to add or remove device entries. If the file
does not exist, or if lvm.conf includes use_devicesfile=0, then
lvm will not use a devices file. When the devices file is in use,
the regex filter is not used, and the filter settings in lvm.conf
or on the command line are ignored.
LVM records devices in the devices file using hardware-specific
IDs, such as the WWID, and attempts to use subsystem-specific
IDs for virtual device types. These device IDs are also written
in the VG metadata. When no hardware or virtual ID is available,
lvm falls back using the unstable device name as the device ID.
When devnames are used, lvm performs extra scanning to find
devices if their devname changes, e.g. after reboot.
When proper device IDs are used, an lvm command will not look
at devices outside the devices file, but when devnames are used
as a fallback, lvm will scan devices outside the devices file
to locate PVs on renamed devices. A config setting
search_for_devnames can be used to control the scanning for
renamed devname entries.
Related to the devices file, the new command option
--devices <devnames> allows a list of devices to be specified for
the command to use, overriding the devices file. The listed
devices act as a sort of devices file in terms of limiting which
devices lvm will see and use. Devices that are not listed will
appear to be missing to the lvm command.
Multiple devices files can be kept in /etc/lvm/devices, which
allows lvm to be used with different sets of devices, e.g.
system devices do not need to be exposed to a specific application,
and the application can use lvm on its own set of devices that are
not exposed to the system. The option --devicesfile <filename> is
used to select the devices file to use with the command. Without
the option set, the default system devices file is used.
Setting --devicesfile "" causes lvm to not use a devices file.
An existing, empty devices file means lvm will see no devices.
The new command vgimportdevices adds PVs from a VG to the devices
file and updates the VG metadata to include the device IDs.
vgimportdevices -a will import all VGs into the system devices file.
LVM commands run by dmeventd not use a devices file by default,
and will look at all devices on the system. A devices file can
be created for dmeventd (/etc/lvm/devices/dmeventd.devices) If
this file exists, lvm commands run by dmeventd will use it.
Internal implementaion:
- device_ids_read - read the devices file
. add struct dev_use (du) to cmd->use_devices for each devices file entry
- dev_cache_scan - get /dev entries
. add struct device (dev) to dev_cache for each device on the system
- device_ids_match - match devices file entries to /dev entries
. match each du on cmd->use_devices to a dev in dev_cache, using device ID
. on match, set du->dev, dev->id, dev->flags MATCHED_USE_ID
- label_scan - read lvm headers and metadata from devices
. filters are applied, those that do not need data from the device
. filter-deviceid skips devs without MATCHED_USE_ID, i.e.
skips /dev entries that are not listed in the devices file
. read lvm label from dev
. filters are applied, those that use data from the device
. read lvm metadata from dev
. add info/vginfo structs for PVs/VGs (info is "lvmcache")
- device_ids_find_renamed_devs - handle devices with unstable devname ID
where devname changed
. this step only needed when devs do not have proper device IDs,
and their dev names change, e.g. after reboot sdb becomes sdc.
. detect incorrect match because PVID in the devices file entry
does not match the PVID found when the device was read above
. undo incorrect match between du and dev above
. search system devices for new location of PVID
. update devices file with new devnames for PVIDs on renamed devices
. label_scan the renamed devs
- continue with command processing
295 lines
13 KiB
C
295 lines
13 KiB
C
/*
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* Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.
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* Copyright (C) 2004-2015 Red Hat, Inc. All rights reserved.
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*
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* This file is part of LVM2.
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*
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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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* of the GNU Lesser General Public License v.2.1.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef _LVM_TOOLS_H
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#define _LVM_TOOLS_H
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#include "tools/tool.h"
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#include "lib/log/lvm-logging.h"
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#include "lib/activate/activate.h"
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#include "lib/format_text/archiver.h"
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#include "lib/cache/lvmcache.h"
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#include "lib/locking/lvmlockd.h"
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#include "lvm-version.h"
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#include "lib/config/config.h"
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#include "lib/config/defaults.h"
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#include "lib/device/dev-cache.h"
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#include "lib/device/device.h"
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#include "lib/device/device_id.h"
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#include "lib/display/display.h"
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#include "errors.h"
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#include "lib/metadata/metadata-exported.h"
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#include "lib/locking/locking.h"
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#include "lib/misc/lvm-exec.h"
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#include "lib/misc/lvm-file.h"
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#include "lib/misc/lvm-signal.h"
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#include "lib/misc/lvm-string.h"
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#include "lib/metadata/segtype.h"
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#include "lib/datastruct/str_list.h"
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#include "lib/commands/toolcontext.h"
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#include "toollib.h"
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#include "lib/notify/lvmnotify.h"
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#include "lib/label/hints.h"
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#include <ctype.h>
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#include <sys/types.h>
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#define CMD_LEN 256
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#define MAX_ARGS 64
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/* define the enums for each unique ID in command defs in command-lines.in */
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enum {
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#define cmd(a, b) a ,
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#include "cmds.h"
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#undef cmd
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};
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/* define the enums for the values accepted by command line --options, foo_VAL */
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enum {
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#define val(a, b, c, d) a ,
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#include "vals.h"
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#undef val
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};
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/* define the enums for the command line --options, foo_ARG */
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enum {
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#define arg(a, b, c, d, e, f, g) a ,
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#include "args.h"
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#undef arg
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};
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/* command functions */
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#define xx(a, b...) int a(struct cmd_context *cmd, int argc, char **argv);
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#include "commands.h"
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#undef xx
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/* define enums for LV properties, foo_LVP */
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enum {
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#define lvp(a, b, c) a ,
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#include "lv_props.h"
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#undef lvp
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};
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/* define enums for LV types, foo_LVT */
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enum {
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#define lvt(a, b, c) a ,
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#include "lv_types.h"
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#undef lvt
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};
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#include "command.h"
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#include "command-count.h"
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#define ARG_COUNTABLE 0x00000001 /* E.g. -vvvv */
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#define ARG_GROUPABLE 0x00000002 /* E.g. --addtag */
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struct arg_values {
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unsigned count;
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char *value;
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int32_t i_value;
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uint32_t ui_value;
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int64_t i64_value;
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uint64_t ui64_value;
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sign_t sign;
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percent_type_t percent;
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};
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struct arg_value_group_list {
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struct dm_list list;
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uint32_t prio;
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struct arg_values arg_values[];
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};
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#define PERMITTED_READ_ONLY 0x00000002
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/* Process all VGs if none specified on the command line. */
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#define ALL_VGS_IS_DEFAULT 0x00000004
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/* Process all devices with --all if none are specified on the command line. */
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#define ENABLE_ALL_DEVS 0x00000008
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/* Command may try to interpret a vgname arg as a uuid. */
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#define ALLOW_UUID_AS_NAME 0x00000010
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/* Command needs a shared lock on a VG; it only reads the VG. */
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#define LOCKD_VG_SH 0x00000020
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/* Command does not process any metadata. */
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#define NO_METADATA_PROCESSING 0x00000040
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/* Command must use all specified arg names and fail if all cannot be used. */
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#define MUST_USE_ALL_ARGS 0x00000100
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/* Command should process unused duplicate devices. */
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#define ENABLE_DUPLICATE_DEVS 0x00000400
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/* Command does not accept tags as args. */
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#define DISALLOW_TAG_ARGS 0x00000800
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/* Command may need to find VG name in an option value. */
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#define GET_VGNAME_FROM_OPTIONS 0x00001000
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/* The data read from disk by label scan can be used for vg_read. */
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#define CAN_USE_ONE_SCAN 0x00002000
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/* Command can use hints file */
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#define ALLOW_HINTS 0x00004000
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/* Command can access exported vg. */
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#define ALLOW_EXPORTED 0x00008000
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void usage(const char *name);
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/* the argument verify/normalise functions */
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int yes_no_arg(struct cmd_context *cmd, struct arg_values *av);
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int activation_arg(struct cmd_context *cmd, struct arg_values *av);
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int cachemetadataformat_arg(struct cmd_context *cmd, struct arg_values *av);
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int cachemode_arg(struct cmd_context *cmd, struct arg_values *av);
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int discards_arg(struct cmd_context *cmd, struct arg_values *av);
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int mirrorlog_arg(struct cmd_context *cmd, struct arg_values *av);
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int size_kb_arg(struct cmd_context *cmd, struct arg_values *av);
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int ssize_kb_arg(struct cmd_context *cmd, struct arg_values *av);
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int size_mb_arg(struct cmd_context *cmd, struct arg_values *av);
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int ssize_mb_arg(struct cmd_context *cmd, struct arg_values *av);
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int psize_mb_arg(struct cmd_context *cmd, struct arg_values *av);
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int nsize_mb_arg(struct cmd_context *cmd, struct arg_values *av);
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int int_arg(struct cmd_context *cmd, struct arg_values *av);
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int uint32_arg(struct cmd_context *cmd, struct arg_values *av);
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int int_arg_with_sign(struct cmd_context *cmd, struct arg_values *av);
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int int_arg_with_plus(struct cmd_context *cmd, struct arg_values *av);
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int extents_arg(struct cmd_context *cmd, struct arg_values *av);
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int sextents_arg(struct cmd_context *cmd, struct arg_values *av);
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int pextents_arg(struct cmd_context *cmd, struct arg_values *av);
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int nextents_arg(struct cmd_context *cmd, struct arg_values *av);
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int major_arg(struct cmd_context *cmd, struct arg_values *av);
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int minor_arg(struct cmd_context *cmd, struct arg_values *av);
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int string_arg(struct cmd_context *cmd, struct arg_values *av);
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int tag_arg(struct cmd_context *cmd, struct arg_values *av);
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int permission_arg(struct cmd_context *cmd, struct arg_values *av);
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int metadatatype_arg(struct cmd_context *cmd, struct arg_values *av);
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int units_arg(struct cmd_context *cmd, struct arg_values *av);
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int segtype_arg(struct cmd_context *cmd, struct arg_values *av);
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int alloc_arg(struct cmd_context *cmd, struct arg_values *av);
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int locktype_arg(struct cmd_context *cmd, struct arg_values *av);
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int readahead_arg(struct cmd_context *cmd, struct arg_values *av);
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int regionsize_mb_arg(struct cmd_context *cmd, struct arg_values *av);
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int vgmetadatacopies_arg(struct cmd_context *cmd __attribute__((unused)), struct arg_values *av);
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int pvmetadatacopies_arg(struct cmd_context *cmd __attribute__((unused)), struct arg_values *av);
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int metadatacopies_arg(struct cmd_context *cmd __attribute__((unused)), struct arg_values *av);
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int polloperation_arg(struct cmd_context *cmd __attribute__((unused)), struct arg_values *av);
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int writemostly_arg(struct cmd_context *cmd __attribute__((unused)), struct arg_values *av);
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int syncaction_arg(struct cmd_context *cmd __attribute__((unused)), struct arg_values *av);
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int reportformat_arg(struct cmd_context *cmd __attribute__((unused)), struct arg_values *av);
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int configreport_arg(struct cmd_context *cmd __attribute__((unused)), struct arg_values *av);
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int configtype_arg(struct cmd_context *cmd __attribute__((unused)), struct arg_values *av);
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int repairtype_arg(struct cmd_context *cmd __attribute__((unused)), struct arg_values *av);
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int dumptype_arg(struct cmd_context *cmd __attribute__((unused)), struct arg_values *av);
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/* we use the enums to access the switches */
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unsigned arg_count(const struct cmd_context *cmd, int a);
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unsigned arg_is_set(const struct cmd_context *cmd, int a);
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int arg_from_list_is_set(const struct cmd_context *cmd, const char *err_found, ...);
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int arg_outside_list_is_set(const struct cmd_context *cmd, const char *err_found, ...);
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int arg_from_list_is_negative(const struct cmd_context *cmd, const char *err_found, ...);
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int arg_from_list_is_zero(const struct cmd_context *cmd, const char *err_found, ...);
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const char *arg_long_option_name(int a);
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const char *arg_value(const struct cmd_context *cmd, int a);
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const char *arg_str_value(const struct cmd_context *cmd, int a, const char *def);
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int32_t arg_int_value(const struct cmd_context *cmd, int a, const int32_t def);
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int32_t first_grouped_arg_int_value(const struct cmd_context *cmd, int a, const int32_t def);
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uint32_t arg_uint_value(const struct cmd_context *cmd, int a, const uint32_t def);
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int64_t arg_int64_value(const struct cmd_context *cmd, int a, const int64_t def);
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uint64_t arg_uint64_value(const struct cmd_context *cmd, int a, const uint64_t def);
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const void *arg_ptr_value(const struct cmd_context *cmd, int a, const void *def);
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sign_t arg_sign_value(const struct cmd_context *cmd, int a, const sign_t def);
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percent_type_t arg_percent_value(const struct cmd_context *cmd, int a, const percent_type_t def);
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int arg_count_increment(struct cmd_context *cmd, int a);
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unsigned grouped_arg_count(const struct arg_values *av, int a);
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unsigned grouped_arg_is_set(const struct arg_values *av, int a);
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const char *grouped_arg_str_value(const struct arg_values *av, int a, const char *def);
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int32_t grouped_arg_int_value(const struct arg_values *av, int a, const int32_t def);
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const char *command_name(struct cmd_context *cmd);
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int pvmove_poll(struct cmd_context *cmd, const char *pv_name, const char *uuid,
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const char *vg_name, const char *lv_name, unsigned background);
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int lvconvert_poll(struct cmd_context *cmd, struct logical_volume *lv, unsigned background);
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int mirror_remove_missing(struct cmd_context *cmd,
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struct logical_volume *lv, int force);
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int vgchange_activate(struct cmd_context *cmd, struct volume_group *vg,
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activation_change_t activate);
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int vgchange_background_polling(struct cmd_context *cmd, struct volume_group *vg);
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int vgchange_locktype_cmd(struct cmd_context *cmd, int argc, char **argv);
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int vgchange_lock_start_stop_cmd(struct cmd_context *cmd, int argc, char **argv);
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int vgchange_systemid_cmd(struct cmd_context *cmd, int argc, char **argv);
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struct lv_prop *get_lv_prop(int lvp_enum);
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struct lv_type *get_lv_type(int lvt_enum);
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struct command *get_command(int cmd_enum);
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int lvchange_properties_cmd(struct cmd_context *cmd, int argc, char **argv);
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int lvchange_activate_cmd(struct cmd_context *cmd, int argc, char **argv);
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int lvchange_refresh_cmd(struct cmd_context *cmd, int argc, char **argv);
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int lvchange_resync_cmd(struct cmd_context *cmd, int argc, char **argv);
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int lvchange_syncaction_cmd(struct cmd_context *cmd, int argc, char **argv);
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int lvchange_rebuild_cmd(struct cmd_context *cmd, int argc, char **argv);
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int lvchange_monitor_poll_cmd(struct cmd_context *cmd, int argc, char **argv);
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int lvchange_persistent_cmd(struct cmd_context *cmd, int argc, char **argv);
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int lvconvert_repair_cmd(struct cmd_context *cmd, int argc, char **argv);
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int lvconvert_replace_pv_cmd(struct cmd_context *cmd, int argc, char **argv);
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int lvconvert_merge_snapshot_cmd(struct cmd_context *cmd, int argc, char **argv);
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int lvconvert_split_snapshot_cmd(struct cmd_context *cmd, int argc, char **argv);
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int lvconvert_combine_split_snapshot_cmd(struct cmd_context *cmd, int argc, char **argv);
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int lvconvert_start_poll_cmd(struct cmd_context *cmd, int argc, char **argv);
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int lvconvert_to_pool_cmd(struct cmd_context *cmd, int argc, char **argv);
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int lvconvert_to_cache_with_cachevol_cmd(struct cmd_context *cmd, int argc, char **argv);
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int lvconvert_to_cache_with_cachepool_cmd(struct cmd_context *cmd, int argc, char **argv);
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int lvconvert_to_writecache_cmd(struct cmd_context *cmd, int argc, char **argv);
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int lvconvert_to_thin_with_external_cmd(struct cmd_context *cmd, int argc, char **argv);
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int lvconvert_swap_pool_metadata_cmd(struct cmd_context *cmd, int argc, char **argv);
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int lvconvert_to_pool_or_swap_metadata_cmd(struct cmd_context *cmd, int argc, char **argv);
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int lvconvert_merge_thin_cmd(struct cmd_context *cmd, int argc, char **argv);
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int lvconvert_split_cache_cmd(struct cmd_context *cmd, int argc, char **argv);
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int lvconvert_raid_types_cmd(struct cmd_context * cmd, int argc, char **argv);
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int lvconvert_split_mirror_images_cmd(struct cmd_context * cmd, int argc, char **argv);
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int lvconvert_merge_mirror_images_cmd(struct cmd_context *cmd, int argc, char **argv);
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int lvconvert_change_mirrorlog_cmd(struct cmd_context * cmd, int argc, char **argv);
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int lvconvert_change_region_size_cmd(struct cmd_context * cmd, int argc, char **argv);
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int lvconvert_merge_cmd(struct cmd_context *cmd, int argc, char **argv);
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int lvconvert_to_vdopool_cmd(struct cmd_context *cmd, int argc, char **argv);
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int lvconvert_to_vdopool_param_cmd(struct cmd_context *cmd, int argc, char **argv);
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int lvconvert_integrity_cmd(struct cmd_context *cmd, int argc, char **argv);
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int lvcreate_and_attach_writecache_cmd(struct cmd_context *cmd, int argc, char **argv);
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int lvcreate_and_attach_cache_cmd(struct cmd_context *cmd, int argc, char **argv);
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int pvscan_display_cmd(struct cmd_context *cmd, int argc, char **argv);
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int pvscan_cache_cmd(struct cmd_context *cmd, int argc, char **argv);
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int lvconvert_writecache_attach_single(struct cmd_context *cmd,
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struct logical_volume *lv,
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struct processing_handle *handle);
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int lvconvert_cachevol_attach_single(struct cmd_context *cmd,
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struct logical_volume *lv,
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struct processing_handle *handle);
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#endif
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