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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.
58 lines
2.6 KiB
C
58 lines
2.6 KiB
C
/*
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* Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.
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* Copyright (C) 2004-2007 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_DEVICE_ID_H
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#define _LVM_DEVICE_ID_H
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void free_du(struct dev_use *du);
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void free_dus(struct dm_list *list);
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void free_did(struct dev_id *did);
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void free_dids(struct dm_list *list);
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const char *idtype_to_str(uint16_t idtype);
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uint16_t idtype_from_str(const char *str);
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const char *dev_idtype_for_metadata(struct cmd_context *cmd, struct device *dev);
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const char *dev_idname_for_metadata(struct cmd_context *cmd, struct device *dev);
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int device_ids_use_devname(struct cmd_context *cmd);
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int device_ids_read(struct cmd_context *cmd);
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int device_ids_write(struct cmd_context *cmd);
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int device_id_add(struct cmd_context *cmd, struct device *dev, const char *pvid,
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const char *idtype_arg, const char *id_arg);
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void device_id_pvremove(struct cmd_context *cmd, struct device *dev);
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void device_ids_match(struct cmd_context *cmd);
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int device_ids_match_dev(struct cmd_context *cmd, struct device *dev);
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void device_ids_validate(struct cmd_context *cmd, struct dm_list *scanned_devs, int *device_ids_invalid, int noupdate);
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int device_ids_version_unchanged(struct cmd_context *cmd);
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void device_ids_find_renamed_devs(struct cmd_context *cmd, struct dm_list *dev_list, int *search_count, int noupdate);
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const char *device_id_system_read(struct cmd_context *cmd, struct device *dev, uint16_t idtype);
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struct dev_use *get_du_for_dev(struct cmd_context *cmd, struct device *dev);
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struct dev_use *get_du_for_pvid(struct cmd_context *cmd, const char *pvid);
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char *devices_file_version(void);
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int devices_file_exists(struct cmd_context *cmd);
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int devices_file_touch(struct cmd_context *cmd);
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int lock_devices_file(struct cmd_context *cmd, int mode);
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int lock_devices_file_try(struct cmd_context *cmd, int mode, int *held);
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void unlock_devices_file(struct cmd_context *cmd);
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void devices_file_init(struct cmd_context *cmd);
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void devices_file_exit(struct cmd_context *cmd);
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void unlink_searched_devnames(struct cmd_context *cmd);
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int read_sys_block(struct cmd_context *cmd, struct device *dev, const char *suffix, char *sysbuf, int sysbufsize);
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#endif
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