mirror of
git://sourceware.org/git/lvm2.git
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85 lines
1.7 KiB
C
85 lines
1.7 KiB
C
/*
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* Copyright (C) 2009 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 "dev-type.h"
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#ifdef linux
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#define MAX_PAGESIZE (64 * 1024)
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#define SIGNATURE_SIZE 10
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static int
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_swap_detect_signature(const char *buf)
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{
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if (memcmp(buf, "SWAP-SPACE", 10) == 0 ||
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memcmp(buf, "SWAPSPACE2", 10) == 0)
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return 1;
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if (memcmp(buf, "S1SUSPEND", 9) == 0 ||
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memcmp(buf, "S2SUSPEND", 9) == 0 ||
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memcmp(buf, "ULSUSPEND", 9) == 0 ||
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memcmp(buf, "\xed\xc3\x02\xe9\x98\x56\xe5\x0c", 8) == 0)
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return 1;
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return 0;
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}
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int dev_is_swap(struct device *dev, uint64_t *signature)
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{
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char buf[10];
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uint64_t size;
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unsigned page;
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int ret = 0;
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if (!dev_get_size(dev, &size)) {
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stack;
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return -1;
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}
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if (!dev_open_readonly(dev)) {
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stack;
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return -1;
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}
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*signature = 0;
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for (page = 0x1000; page <= MAX_PAGESIZE; page <<= 1) {
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/*
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* skip 32k pagesize since this does not seem to be supported
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*/
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if (page == 0x8000)
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continue;
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if (size < page)
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break;
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if (!dev_read(dev, page - SIGNATURE_SIZE,
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SIGNATURE_SIZE, buf)) {
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ret = -1;
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break;
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}
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if (_swap_detect_signature(buf)) {
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*signature = page - SIGNATURE_SIZE;
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ret = 1;
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break;
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}
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}
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if (!dev_close(dev))
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stack;
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return ret;
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}
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#endif
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