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8a843d0d97
Usable device filter is responsible for filtering out unusable DM devices.
The filter has 3 modes of operation:
- FILTER_MODE_NO_LVMETAD:
When this mode is used, we check DM device usability by looking:
- whether device is empty
- whether device is blocked
- whether device is suspended (only on devices/ignore_suspended_devices=1)
- whether device uses an error target
- whether device name/uuid is reserved
- FILTER_MODE_PRE_LVMETAD:
When this mode is used, we check DM device usability by looking:
- whether device is empty
- whether device is suspended (only on devices/ignore_suspended_devices=1)
- whether device uses an error target
- whether device name/uuid is reserved
- FILTER_MODE_POST_LVMETAD:
When this mode is used, we check DM device usability by looking:
- whether device is blocked
- whether device is suspended (only on devices/ignore_suspended_devices=1)
These modes will be used by subsequent patch to create different
instances of this filter, depending on lvmetad use.
90 lines
2.4 KiB
C
90 lines
2.4 KiB
C
/*
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* Copyright (C) 2014 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "lib.h"
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#include "filter.h"
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#include "activate.h" /* device_is_usable */
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static int _passes_usable_filter(struct dev_filter *f, struct device *dev)
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{
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filter_mode_t mode = *((filter_mode_t *) f->private);
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struct dev_usable_check_params ucp;
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int r;
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/* filter only device-mapper devices */
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if (!dm_is_dm_major(MAJOR(dev->dev)))
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return 1;
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switch (mode) {
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case FILTER_MODE_NO_LVMETAD:
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ucp.check_empty = 1;
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ucp.check_blocked = 1;
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ucp.check_suspended = ignore_suspended_devices();
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ucp.check_error_target = 1;
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ucp.check_reserved = 1;
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break;
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case FILTER_MODE_PRE_LVMETAD:
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ucp.check_empty = 1;
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ucp.check_blocked = 0;
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ucp.check_suspended = ignore_suspended_devices();
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ucp.check_error_target = 1;
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ucp.check_reserved = 1;
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break;
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case FILTER_MODE_POST_LVMETAD:
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ucp.check_empty = 0;
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ucp.check_blocked = 1;
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ucp.check_suspended = ignore_suspended_devices();
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ucp.check_error_target = 0;
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ucp.check_reserved = 0;
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break;
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}
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if (!(r = device_is_usable(dev, ucp)))
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log_debug_devs("%s: Skipping unusable device", dev_name(dev));
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return r;
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}
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static void _usable_filter_destroy(struct dev_filter *f)
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{
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if (f->use_count)
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log_error(INTERNAL_ERROR "Destroying usable device filter while in use %u times.", f->use_count);
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dm_free(f->private);
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dm_free(f);
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}
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struct dev_filter *usable_filter_create(struct dev_types *dt __attribute__((unused)), filter_mode_t mode)
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{
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struct dev_filter *f;
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if (!(f = dm_zalloc(sizeof(struct dev_filter)))) {
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log_error("Usable device filter allocation failed");
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return NULL;
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}
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f->passes_filter = _passes_usable_filter;
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f->destroy = _usable_filter_destroy;
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f->use_count = 0;
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if (!(f->private = dm_zalloc(sizeof(filter_mode_t)))) {
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log_error("Usable device filter mode allocation failed");
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return NULL;
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}
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*((filter_mode_t *) f->private) = mode;
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log_debug_devs("Usable device filter initialised.");
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return f;
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}
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