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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.
77 lines
1.7 KiB
C
77 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., 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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#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 _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 *offset_found, int full)
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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 (!scan_bcache)
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return -EAGAIN;
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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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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 >> SECTOR_SHIFT))
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break;
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if (!dev_read_bytes(dev, page - SIGNATURE_SIZE, 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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if (offset_found)
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*offset_found = 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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return ret;
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}
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#endif
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