1*86d7f5d3SJohn Marino /* $NetBSD: dev-swap.c,v 1.2 2009/12/02 01:53:25 haad Exp $ */
2*86d7f5d3SJohn Marino
3*86d7f5d3SJohn Marino /*
4*86d7f5d3SJohn Marino * Copyright (C) 2009 Red Hat, Inc. All rights reserved.
5*86d7f5d3SJohn Marino *
6*86d7f5d3SJohn Marino * This file is part of LVM2.
7*86d7f5d3SJohn Marino *
8*86d7f5d3SJohn Marino * This copyrighted material is made available to anyone wishing to use,
9*86d7f5d3SJohn Marino * modify, copy, or redistribute it subject to the terms and conditions
10*86d7f5d3SJohn Marino * of the GNU Lesser General Public License v.2.1.
11*86d7f5d3SJohn Marino *
12*86d7f5d3SJohn Marino * You should have received a copy of the GNU Lesser General Public License
13*86d7f5d3SJohn Marino * along with this program; if not, write to the Free Software Foundation,
14*86d7f5d3SJohn Marino * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
15*86d7f5d3SJohn Marino */
16*86d7f5d3SJohn Marino
17*86d7f5d3SJohn Marino #include "lib.h"
18*86d7f5d3SJohn Marino #include "metadata.h"
19*86d7f5d3SJohn Marino #include "xlate.h"
20*86d7f5d3SJohn Marino #include "filter.h"
21*86d7f5d3SJohn Marino
22*86d7f5d3SJohn Marino #ifdef linux
23*86d7f5d3SJohn Marino
24*86d7f5d3SJohn Marino #define MAX_PAGESIZE (64 * 1024)
25*86d7f5d3SJohn Marino #define SIGNATURE_SIZE 10
26*86d7f5d3SJohn Marino
27*86d7f5d3SJohn Marino static int
_swap_detect_signature(const char * buf)28*86d7f5d3SJohn Marino _swap_detect_signature(const char *buf)
29*86d7f5d3SJohn Marino {
30*86d7f5d3SJohn Marino if (memcmp(buf, "SWAP-SPACE", 10) == 0 ||
31*86d7f5d3SJohn Marino memcmp(buf, "SWAPSPACE2", 10) == 0)
32*86d7f5d3SJohn Marino return 1;
33*86d7f5d3SJohn Marino
34*86d7f5d3SJohn Marino if (memcmp(buf, "S1SUSPEND", 9) == 0 ||
35*86d7f5d3SJohn Marino memcmp(buf, "S2SUSPEND", 9) == 0 ||
36*86d7f5d3SJohn Marino memcmp(buf, "ULSUSPEND", 9) == 0 ||
37*86d7f5d3SJohn Marino memcmp(buf, "\xed\xc3\x02\xe9\x98\x56\xe5\x0c", 8) == 0)
38*86d7f5d3SJohn Marino return 1;
39*86d7f5d3SJohn Marino
40*86d7f5d3SJohn Marino return 0;
41*86d7f5d3SJohn Marino }
42*86d7f5d3SJohn Marino
dev_is_swap(struct device * dev,uint64_t * signature)43*86d7f5d3SJohn Marino int dev_is_swap(struct device *dev, uint64_t *signature)
44*86d7f5d3SJohn Marino {
45*86d7f5d3SJohn Marino char buf[10];
46*86d7f5d3SJohn Marino uint64_t size;
47*86d7f5d3SJohn Marino int page;
48*86d7f5d3SJohn Marino
49*86d7f5d3SJohn Marino if (!dev_get_size(dev, &size)) {
50*86d7f5d3SJohn Marino stack;
51*86d7f5d3SJohn Marino return -1;
52*86d7f5d3SJohn Marino }
53*86d7f5d3SJohn Marino
54*86d7f5d3SJohn Marino if (!dev_open(dev)) {
55*86d7f5d3SJohn Marino stack;
56*86d7f5d3SJohn Marino return -1;
57*86d7f5d3SJohn Marino }
58*86d7f5d3SJohn Marino
59*86d7f5d3SJohn Marino *signature = 0;
60*86d7f5d3SJohn Marino
61*86d7f5d3SJohn Marino for (page = 0x1000; page <= MAX_PAGESIZE; page <<= 1) {
62*86d7f5d3SJohn Marino /*
63*86d7f5d3SJohn Marino * skip 32k pagesize since this does not seem to be supported
64*86d7f5d3SJohn Marino */
65*86d7f5d3SJohn Marino if (page == 0x8000)
66*86d7f5d3SJohn Marino continue;
67*86d7f5d3SJohn Marino if (size < page)
68*86d7f5d3SJohn Marino break;
69*86d7f5d3SJohn Marino if (!dev_read(dev, page - SIGNATURE_SIZE,
70*86d7f5d3SJohn Marino SIGNATURE_SIZE, buf)) {
71*86d7f5d3SJohn Marino stack;
72*86d7f5d3SJohn Marino return -1;
73*86d7f5d3SJohn Marino }
74*86d7f5d3SJohn Marino if (_swap_detect_signature(buf)) {
75*86d7f5d3SJohn Marino *signature = page - SIGNATURE_SIZE;
76*86d7f5d3SJohn Marino break;
77*86d7f5d3SJohn Marino }
78*86d7f5d3SJohn Marino }
79*86d7f5d3SJohn Marino
80*86d7f5d3SJohn Marino if (!dev_close(dev))
81*86d7f5d3SJohn Marino stack;
82*86d7f5d3SJohn Marino
83*86d7f5d3SJohn Marino if (*signature)
84*86d7f5d3SJohn Marino return 1;
85*86d7f5d3SJohn Marino
86*86d7f5d3SJohn Marino return 0;
87*86d7f5d3SJohn Marino }
88*86d7f5d3SJohn Marino
89*86d7f5d3SJohn Marino #else
90*86d7f5d3SJohn Marino
91*86d7f5d3SJohn Marino #if defined(__NetBSD__) || defined(__DragonFly__)
dev_is_swap(struct device * dev,uint64_t * signature)92*86d7f5d3SJohn Marino int dev_is_swap(struct device *dev, uint64_t *signature)
93*86d7f5d3SJohn Marino {
94*86d7f5d3SJohn Marino return 0;
95*86d7f5d3SJohn Marino }
96*86d7f5d3SJohn Marino #endif
97*86d7f5d3SJohn Marino
98*86d7f5d3SJohn Marino #endif
99