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9048565093
related to config settings:
obtain_device_info_from_udev (controls if lvm gets
a list of devices from readdir /dev or from libudev)
external_device_info_source (controls if lvm asks
libudev for device information)
. Make the obtain_device_list_from_udev setting
affect only the choice of readdir /dev vs libudev.
The setting no longer controls if udev is used for
device type checks.
. Change obtain_device_list_from_udev default to 0.
This helps avoid boot timeouts due to slow libudev
queries, avoids reported failures from
udev_enumerate_scan_devices, and avoids delays from
"device not initialized in udev database" errors.
Even without errors, for a system booting with 1024 PVs,
lvm2-pvscan times improve from about 100 sec to 15 sec,
and the pvscan command from about 64 sec to about 4 sec.
. For external_device_info_source="none", remove all
libudev device info queries, and use only lvm
native device info.
. For external_device_info_source="udev", first check
lvm native device info, then check libudev info.
. Remove sleep/retry loop when attempting libudev
queries for device info. udev info will simply
be skipped if it's not immediately available.
. Only set up a libdev connection if it will be used by
obtain_device_list_from_udev/external_device_info_source.
. For native multipath component detection, use
/etc/multipath/wwids. If a device has a wwid
matching an entry in the wwids file, then it's
considered a multipath component. This is
necessary to natively detect multipath
components when the mpath device is not set up.
108 lines
3.8 KiB
C
108 lines
3.8 KiB
C
/*
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* Copyright (C) 2013 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_DEV_TYPE_H
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#define _LVM_DEV_TYPE_H
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#include "lib/device/device.h"
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#include "lib/display/display.h"
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#include "lib/label/label.h"
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#define NUMBER_OF_MAJORS 4096
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#ifdef __linux__
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# include "libdm/misc/kdev_t.h"
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#else
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# define MAJOR(x) major((x))
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# define MINOR(x) minor((x))
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# define MKDEV(x,y) makedev((x),(y))
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#endif
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#define PARTITION_SCSI_DEVICE (1 << 0)
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struct dev_type_def {
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int max_partitions; /* 0 means LVM won't use this major number. */
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int flags;
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};
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struct dev_types {
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int md_major;
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int blkext_major;
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int drbd_major;
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int device_mapper_major;
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int emcpower_major;
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int vxdmp_major;
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int power2_major;
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int dasd_major;
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int loop_major;
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struct dev_type_def dev_type_array[NUMBER_OF_MAJORS];
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};
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struct dev_types *create_dev_types(const char *proc_dir, const struct dm_config_node *cn);
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/* Subsystems */
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int dev_subsystem_part_major(struct dev_types *dt, struct device *dev);
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const char *dev_subsystem_name(struct dev_types *dt, struct device *dev);
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int major_is_scsi_device(struct dev_types *dt, int major);
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/* Signature/superblock recognition with position returned where found. */
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int dev_is_md_component(struct cmd_context *cmd, struct device *dev, uint64_t *sb, int full);
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int dev_is_mpath_component(struct cmd_context *cmd, struct device *dev);
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int dev_is_swap(struct cmd_context *cmd, struct device *dev, uint64_t *signature, int full);
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int dev_is_luks(struct cmd_context *cmd, struct device *dev, uint64_t *signature, int full);
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int dasd_is_cdl_formatted(struct device *dev);
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int dev_is_lvm1(struct device *dev, char *buf, int buflen);
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int dev_is_pool(struct device *dev, char *buf, int buflen);
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/* Signature wiping. */
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#define TYPE_LVM1_MEMBER 0x001
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#define TYPE_LVM2_MEMBER 0x002
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#define TYPE_DM_SNAPSHOT_COW 0x004
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int wipe_known_signatures(struct cmd_context *cmd, struct device *dev, const char *name,
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uint32_t types_to_exclude, uint32_t types_no_prompt,
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int yes, force_t force, int *wiped);
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/* Type-specific device properties */
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unsigned long dev_md_stripe_width(struct dev_types *dt, struct device *dev);
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int dev_is_md_with_end_superblock(struct dev_types *dt, struct device *dev);
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/* Partitioning */
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int major_max_partitions(struct dev_types *dt, int major);
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int dev_is_partitioned(struct cmd_context *cmd, struct device *dev);
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int dev_get_primary_dev(struct dev_types *dt, struct device *dev, dev_t *result);
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int dev_get_partition_number(struct device *dev, int *num);
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/* Various device properties */
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unsigned long dev_alignment_offset(struct dev_types *dt, struct device *dev);
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unsigned long dev_minimum_io_size(struct dev_types *dt, struct device *dev);
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unsigned long dev_optimal_io_size(struct dev_types *dt, struct device *dev);
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unsigned long dev_discard_max_bytes(struct dev_types *dt, struct device *dev);
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unsigned long dev_discard_granularity(struct dev_types *dt, struct device *dev);
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int dev_is_rotational(struct dev_types *dt, struct device *dev);
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int dev_is_pmem(struct dev_types *dt, struct device *dev);
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int dev_is_nvme(struct dev_types *dt, struct device *dev);
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int dev_is_lv(struct device *dev);
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int get_fs_block_size(const char *pathname, uint32_t *fs_block_size);
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int dev_is_used_by_active_lv(struct cmd_context *cmd, struct device *dev, int *used_by_lv_count,
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char **used_by_dm_name, char **used_by_vg_uuid, char **used_by_lv_uuid);
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#endif
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