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57bb46c5e7
Filters are still applied before any device reading or the label scan, but any filter checks that want to read the device are skipped and the device is flagged. After bcache is populated, but before lvm looks for devices (i.e. before label scan), the filters are reapplied to the devices that were flagged above. The filters will then find the data they need in bcache.
40 lines
982 B
C
40 lines
982 B
C
/*
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* Copyright (C) 2010 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 "lib.h"
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#include "dev-type.h"
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#define LUKS_SIGNATURE "LUKS\xba\xbe"
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#define LUKS_SIGNATURE_SIZE 6
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int dev_is_luks(struct device *dev, uint64_t *offset_found, int full)
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{
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char buf[LUKS_SIGNATURE_SIZE];
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int ret = -1;
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if (!scan_bcache)
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return -EAGAIN;
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if (offset_found)
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*offset_found = 0;
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if (!dev_read_bytes(dev, 0, LUKS_SIGNATURE_SIZE, buf))
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goto_out;
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ret = memcmp(buf, LUKS_SIGNATURE, LUKS_SIGNATURE_SIZE) ? 0 : 1;
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out:
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return ret;
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}
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