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lvm2/lib/label/hints.h

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add device hints to reduce scanning Save the list of PVs in /run/lvm/hints. These hints are used to reduce scanning in a number of commands to only the PVs on the system, or only the PVs in a requested VG (rather than all devices on the system.)
2018-12-07 23:35:22 +03:00
/*
* Copyright (C) 2004-2018 Red Hat, Inc. All rights reserved.
*
* This file is part of LVM2.
*
* This copyrighted material is made available to anyone wishing to use,
* modify, copy, or redistribute it subject to the terms and conditions
* of the GNU Lesser General Public License v.2.1.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef _LVM_HINTS_H
#define _LVM_HINTS_H
struct hint {
struct dm_list list;
dev_t devt;
hints: keep strings aligned in structure Preffer aligned string access.
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char name[PATH_MAX] __attribute__((aligned(8)));
char vgname[NAME_LEN] __attribute__((aligned(8)));
char pvid[ID_LEN + 1] __attribute__((aligned(8)));
add device hints to reduce scanning Save the list of PVs in /run/lvm/hints. These hints are used to reduce scanning in a number of commands to only the PVs on the system, or only the PVs in a requested VG (rather than all devices on the system.)
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unsigned chosen:1; /* this hint's dev was chosen for scanning */
};
hints: free hint list in error exit path
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void free_hints(struct dm_list *hints);
add device hints to reduce scanning Save the list of PVs in /run/lvm/hints. These hints are used to reduce scanning in a number of commands to only the PVs on the system, or only the PVs in a requested VG (rather than all devices on the system.)
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int write_hint_file(struct cmd_context *cmd, int newhints);
void clear_hint_file(struct cmd_context *cmd);
hints: invalidate when pvscan --cache sees a new PV An idea from Zdenek for better ensuring valid hints by invalidating them when pvscan --cache <device> sees a new PV, which is a case where we know that hints should be invalidated. This is triggered from systemd/udev logic, and there may be some cases where it would invalidate hints that the existing methods wouldn't detect.
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void invalidate_hints(struct cmd_context *cmd);
add device hints to reduce scanning Save the list of PVs in /run/lvm/hints. These hints are used to reduce scanning in a number of commands to only the PVs on the system, or only the PVs in a requested VG (rather than all devices on the system.)
2018-12-07 23:35:22 +03:00
int get_hints(struct cmd_context *cmd, struct dm_list *hints, int *newhints,
struct dm_list *devs_in, struct dm_list *devs_out);
int validate_hints(struct cmd_context *cmd, struct dm_list *hints);
hints: skip hint flock if nolocking option is set
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void hints_exit(struct cmd_context *cmd);
hints: fix hint flock when using lvm shell also cmd->use_hints needs to be set for each shell command
2019-01-15 21:23:16 +03:00
hints: fix recreating hints from pvscan When aay was included in the pvscan --cache command, the activation part was complaining about the unusual state of the hint file since it had been recreated just prior.
2019-02-14 00:23:43 +03:00
void pvscan_recreate_hints_begin(struct cmd_context *cmd);
vgchange -aay: optimize device list using pvs_online files Port another optimization from pvscan -aay to vgchange -aay: "pvscan: only add device args to dev cache" This optimization avoids doing a full dev_cache_scan, and instead populates dev-cache with only the devices in the VG being activated. This involves shifting the use of pvs_online files from the hints interface up to the higher level label_scan interface. This specialized label_scan is structured around creating a list of devices from the pvs_online files. Previously, a list of all devices was created first, and then reduced based on the pvs_online files. The initial step of listing all devices was slow when thousands of devices are present on the system. This optimization extends the previous optimization that used pvs_online files to limit the devices that were actually scanned (i.e. reading to identify the device): "vgchange -aay: optimize device scan using pvs_online files"
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void get_single_vgname_cmd_arg(struct cmd_context *cmd,
struct dm_list *hints, char **vgname);
add device hints to reduce scanning Save the list of PVs in /run/lvm/hints. These hints are used to reduce scanning in a number of commands to only the PVs on the system, or only the PVs in a requested VG (rather than all devices on the system.)
2018-12-07 23:35:22 +03:00
#endif
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