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_JFS
21 //config: bool "jfs filesystem"
22 //config: default y
23 //config: depends on VOLUMEID
24
25 //kbuild:lib-$(CONFIG_FEATURE_VOLUMEID_JFS) += jfs.o
26
27 #include "volume_id_internal.h"
28
29 struct jfs_super_block {
30 uint8_t magic[4];
31 uint32_t version;
32 uint64_t size;
33 uint32_t bsize;
34 uint32_t dummy1;
35 uint32_t pbsize;
36 uint32_t dummy2[27];
37 uint8_t uuid[16];
38 uint8_t label[16];
39 uint8_t loguuid[16];
40 } PACKED;
41
42 #define JFS_SUPERBLOCK_OFFSET 0x8000
43
volume_id_probe_jfs(struct volume_id * id)44 int FAST_FUNC volume_id_probe_jfs(struct volume_id *id /*,uint64_t off*/)
45 {
46 #define off ((uint64_t)0)
47 struct jfs_super_block *js;
48
49 dbg("probing at offset 0x%llx", (unsigned long long) off);
50
51 js = volume_id_get_buffer(id, off + JFS_SUPERBLOCK_OFFSET, 0x200);
52 if (js == NULL)
53 return -1;
54
55 if (memcmp(js->magic, "JFS1", 4) != 0)
56 return -1;
57
58 // volume_id_set_label_raw(id, js->label, 16);
59 volume_id_set_label_string(id, js->label, 16);
60 volume_id_set_uuid(id, js->uuid, UUID_DCE);
61
62 // volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
63 IF_FEATURE_BLKID_TYPE(id->type = "jfs";)
64
65 return 0;
66 }
67