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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.
102 lines
2.7 KiB
C
102 lines
2.7 KiB
C
/*
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* Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.
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* Copyright (C) 2004-2013 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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#include "base/memory/zalloc.h"
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#include "lib/misc/lib.h"
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#include "lib/filters/filter.h"
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#include "lib/device/device.h"
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static int _and_p(struct cmd_context *cmd, struct dev_filter *f, struct device *dev, const char *use_filter_name)
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{
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struct dev_filter **filters;
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int ret = 1;
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dev_ext_enable(dev, external_device_info_source());
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for (filters = (struct dev_filter **) f->private; *filters; ++filters) {
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if (use_filter_name && strcmp((*filters)->name, use_filter_name))
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continue;
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ret = (*filters)->passes_filter(cmd, *filters, dev, use_filter_name);
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if (!ret) {
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ret = 0; /* No 'stack': a filter, not an error. */
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break;
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}
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}
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dev_ext_disable(dev);
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return ret;
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}
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static void _composite_destroy(struct dev_filter *f)
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{
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struct dev_filter **filters;
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if (f->use_count)
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log_error(INTERNAL_ERROR "Destroying composite filter while in use %u times.", f->use_count);
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for (filters = (struct dev_filter **) f->private; *filters; ++filters)
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(*filters)->destroy(*filters);
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free(f->private);
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free(f);
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}
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static void _wipe(struct cmd_context *cmd, struct dev_filter *f, struct device *dev, const char *use_filter_name)
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{
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struct dev_filter **filters;
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for (filters = (struct dev_filter **) f->private; *filters; ++filters) {
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if (use_filter_name && strcmp((*filters)->name, use_filter_name))
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continue;
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if ((*filters)->wipe)
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(*filters)->wipe(cmd, *filters, dev, use_filter_name);
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}
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}
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struct dev_filter *composite_filter_create(int n, struct dev_filter **filters)
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{
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struct dev_filter **filters_copy, *cft;
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if (!filters)
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return_NULL;
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if (!(filters_copy = malloc(sizeof(*filters) * (n + 1)))) {
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log_error("Composite filters allocation failed.");
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return NULL;
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}
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memcpy(filters_copy, filters, sizeof(*filters) * n);
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filters_copy[n] = NULL;
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if (!(cft = zalloc(sizeof(*cft)))) {
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log_error("Composite filters allocation failed.");
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free(filters_copy);
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return NULL;
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}
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cft->passes_filter = _and_p;
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cft->destroy = _composite_destroy;
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cft->wipe = _wipe;
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cft->use_count = 0;
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cft->private = filters_copy;
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cft->name = "composite";
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log_debug_devs("Composite filter initialised.");
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return cft;
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}
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