1 /*
2 * volume_id - reads filesystem label and uuid
3 *
4 * Copyright (C) 2005 Kay Sievers <kay.sievers@vrfy.org>
5 *
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 */
20 //config:### config FEATURE_VOLUMEID_PROMISERAID
21 //config:### bool "promise raid"
22 //config:### default y
23 //config:### depends on VOLUMEID
24
25 //kbuild:### lib-$(CONFIG_FEATURE_VOLUMEID_PROMISERAID) += promise_raid.o
26
27 #include "volume_id_internal.h"
28
29 struct promise_meta {
30 uint8_t sig[24];
31 } PACKED;
32
33 #define PDC_CONFIG_OFF 0x1200
34 #define PDC_SIGNATURE "Promise Technology, Inc."
35
volume_id_probe_promise_fasttrack_raid(struct volume_id * id,uint64_t off,uint64_t size)36 int FAST_FUNC volume_id_probe_promise_fasttrack_raid(struct volume_id *id, uint64_t off, uint64_t size)
37 {
38 static const unsigned short sectors[] = {
39 63, 255, 256, 16, 399
40 };
41
42 struct promise_meta *pdc;
43 unsigned i;
44
45 dbg("probing at offset 0x%llx, size 0x%llx",
46 (unsigned long long) off, (unsigned long long) size);
47
48 if (size < 0x40000)
49 return -1;
50
51 for (i = 0; i < ARRAY_SIZE(sectors); i++) {
52 uint64_t meta_off;
53
54 meta_off = ((size / 0x200) - sectors[i]) * 0x200;
55 pdc = volume_id_get_buffer(id, off + meta_off, 0x200);
56 if (pdc == NULL)
57 return -1;
58
59 if (memcmp(pdc->sig, PDC_SIGNATURE, sizeof(PDC_SIGNATURE)-1) == 0)
60 goto found;
61 }
62 return -1;
63
64 found:
65 // volume_id_set_usage(id, VOLUME_ID_RAID);
66 // id->type = "promise_fasttrack_raid_member";
67
68 return 0;
69 }
70