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98 lines
2.1 KiB
C
98 lines
2.1 KiB
C
/*
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* Copyright (C) 2004 Luca Berra
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* Copyright (C) 2004-2006 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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#ifdef __linux__
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#define BUFSIZE 4096
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static int _ignore_signature(struct cmd_context *cmd, struct dev_filter *f __attribute__((unused)),
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struct device *dev)
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{
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char buf[BUFSIZE];
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int ret = 0;
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if (!scan_bcache) {
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/* let pass, call again after scan */
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log_debug_devs("filter signature deferred %s", dev_name(dev));
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dev->flags |= DEV_FILTER_AFTER_SCAN;
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return 1;
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}
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memset(buf, 0, BUFSIZE);
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if (!dev_read_bytes(dev, 0, BUFSIZE, buf)) {
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log_debug_devs("%s: Skipping: error in signature detection",
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dev_name(dev));
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ret = 0;
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goto out;
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}
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if (dev_is_lvm1(dev, buf, BUFSIZE)) {
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log_debug_devs("%s: Skipping lvm1 device", dev_name(dev));
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ret = 0;
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goto out;
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}
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if (dev_is_pool(dev, buf, BUFSIZE)) {
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log_debug_devs("%s: Skipping gfs-pool device", dev_name(dev));
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ret = 0;
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goto out;
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}
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ret = 1;
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out:
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return ret;
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}
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static void _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 signature filter while in use %u times.", f->use_count);
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free(f);
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}
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struct dev_filter *signature_filter_create(struct dev_types *dt)
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{
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struct dev_filter *f;
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if (!(f = zalloc(sizeof(*f)))) {
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log_error("md filter allocation failed");
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return NULL;
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}
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f->passes_filter = _ignore_signature;
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f->destroy = _destroy;
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f->use_count = 0;
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f->private = dt;
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log_debug_devs("signature filter initialised.");
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return f;
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}
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#else
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struct dev_filter *signature_filter_create(struct dev_types *dt)
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{
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return NULL;
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}
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#endif
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