1 /*
2 * volume_id - reads filesystem label and uuid
3 *
4 * Copyright (C) 2004 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_CRAMFS
21 //config: bool "cramfs filesystem"
22 //config: default y
23 //config: depends on VOLUMEID
24
25 //kbuild:lib-$(CONFIG_FEATURE_VOLUMEID_CRAMFS) += cramfs.o
26
27 #include "volume_id_internal.h"
28
29 struct cramfs_super {
30 uint32_t magic;
31 uint32_t size;
32 uint32_t flags;
33 uint32_t future;
34 uint8_t signature[16];
35 struct cramfs_info {
36 uint32_t crc;
37 uint32_t edition;
38 uint32_t blocks;
39 uint32_t files;
40 } PACKED info;
41 uint8_t name[16];
42 } PACKED;
43
volume_id_probe_cramfs(struct volume_id * id)44 int FAST_FUNC volume_id_probe_cramfs(struct volume_id *id /*,uint64_t off*/)
45 {
46 #define off ((uint64_t)0)
47 struct cramfs_super *cs;
48
49 dbg("probing at offset 0x%llx", (unsigned long long) off);
50
51 cs = volume_id_get_buffer(id, off, 0x200);
52 if (cs == NULL)
53 return -1;
54
55 if (cs->magic == cpu_to_be32(0x453dcd28)) {
56 // volume_id_set_label_raw(id, cs->name, 16);
57 volume_id_set_label_string(id, cs->name, 16);
58
59 // volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
60 IF_FEATURE_BLKID_TYPE(id->type = "cramfs";)
61 return 0;
62 }
63
64 return -1;
65 }
66