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101 lines
2.5 KiB
C
101 lines
2.5 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)
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{
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struct dev_filter **filters;
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int ret;
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for (filters = (struct dev_filter **) f->private; *filters; ++filters) {
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ret = (*filters)->passes_filter(cmd, *filters, dev);
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if (!ret)
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return 0; /* No 'stack': a filter, not an error. */
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}
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return 1;
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}
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static int _and_p_with_dev_ext_info(struct cmd_context *cmd, struct dev_filter *f, struct device *dev)
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{
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int r;
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dev_ext_enable(dev, external_device_info_source());
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r = _and_p(cmd, f, dev);
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dev_ext_disable(dev);
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return r;
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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 dev_filter *f)
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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 ((*filters)->wipe)
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(*filters)->wipe(*filters);
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}
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struct dev_filter *composite_filter_create(int n, int use_dev_ext_info, 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 = use_dev_ext_info ? _and_p_with_dev_ext_info : _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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log_debug_devs("Composite filter initialised.");
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return cft;
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}
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