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62533ae3fa
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"
49 lines
1.5 KiB
C
49 lines
1.5 KiB
C
/*
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* Copyright (C) 2004-2018 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_HINTS_H
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#define _LVM_HINTS_H
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struct hint {
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struct dm_list list;
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dev_t devt;
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char name[PATH_MAX] __attribute__((aligned(8)));
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char vgname[NAME_LEN] __attribute__((aligned(8)));
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char pvid[ID_LEN + 1] __attribute__((aligned(8)));
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unsigned chosen:1; /* this hint's dev was chosen for scanning */
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};
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void free_hints(struct dm_list *hints);
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int write_hint_file(struct cmd_context *cmd, int newhints);
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void clear_hint_file(struct cmd_context *cmd);
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void invalidate_hints(struct cmd_context *cmd);
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int get_hints(struct cmd_context *cmd, struct dm_list *hints, int *newhints,
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struct dm_list *devs_in, struct dm_list *devs_out);
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int validate_hints(struct cmd_context *cmd, struct dm_list *hints);
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void hints_exit(struct cmd_context *cmd);
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void pvscan_recreate_hints_begin(struct cmd_context *cmd);
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void get_single_vgname_cmd_arg(struct cmd_context *cmd,
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struct dm_list *hints, char **vgname);
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#endif
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