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_SYSV
21 //config: bool "sysv filesystem"
22 //config: default y
23 //config: depends on VOLUMEID
24
25 //kbuild:lib-$(CONFIG_FEATURE_VOLUMEID_SYSV) += sysv.o
26
27 #include "volume_id_internal.h"
28
29 #define SYSV_NICINOD 100
30 #define SYSV_NICFREE 50
31
32 struct sysv_super {
33 uint16_t s_isize;
34 uint16_t s_pad0;
35 uint32_t s_fsize;
36 uint16_t s_nfree;
37 uint16_t s_pad1;
38 uint32_t s_free[SYSV_NICFREE];
39 uint16_t s_ninode;
40 uint16_t s_pad2;
41 uint16_t s_inode[SYSV_NICINOD];
42 uint8_t s_flock;
43 uint8_t s_ilock;
44 uint8_t s_fmod;
45 uint8_t s_ronly;
46 uint32_t s_time;
47 uint16_t s_dinfo[4];
48 uint32_t s_tfree;
49 uint16_t s_tinode;
50 uint16_t s_pad3;
51 uint8_t s_fname[6];
52 uint8_t s_fpack[6];
53 uint32_t s_fill[12];
54 uint32_t s_state;
55 uint32_t s_magic;
56 uint32_t s_type;
57 } PACKED;
58
59 #define XENIX_NICINOD 100
60 #define XENIX_NICFREE 100
61
62 struct xenix_super {
63 uint16_t s_isize;
64 uint32_t s_fsize;
65 uint16_t s_nfree;
66 uint32_t s_free[XENIX_NICFREE];
67 uint16_t s_ninode;
68 uint16_t s_inode[XENIX_NICINOD];
69 uint8_t s_flock;
70 uint8_t s_ilock;
71 uint8_t s_fmod;
72 uint8_t s_ronly;
73 uint32_t s_time;
74 uint32_t s_tfree;
75 uint16_t s_tinode;
76 uint16_t s_dinfo[4];
77 uint8_t s_fname[6];
78 uint8_t s_fpack[6];
79 uint8_t s_clean;
80 uint8_t s_fill[371];
81 uint32_t s_magic;
82 uint32_t s_type;
83 } PACKED;
84
85 #define SYSV_SUPERBLOCK_BLOCK 0x01
86 #define SYSV_MAGIC 0xfd187e20
87 #define XENIX_SUPERBLOCK_BLOCK 0x18
88 #define XENIX_MAGIC 0x2b5544
89 #define SYSV_MAX_BLOCKSIZE 0x800
90
volume_id_probe_sysv(struct volume_id * id)91 int FAST_FUNC volume_id_probe_sysv(struct volume_id *id /*,uint64_t off*/)
92 {
93 #define off ((uint64_t)0)
94 struct sysv_super *vs;
95 struct xenix_super *xs;
96 unsigned boff;
97
98 dbg("probing at offset 0x%llx", (unsigned long long) off);
99
100 for (boff = 0x200; boff <= SYSV_MAX_BLOCKSIZE; boff <<= 1) {
101 vs = volume_id_get_buffer(id, off + (boff * SYSV_SUPERBLOCK_BLOCK), 0x200);
102 if (vs == NULL)
103 return -1;
104
105 if (vs->s_magic == cpu_to_le32(SYSV_MAGIC) || vs->s_magic == cpu_to_be32(SYSV_MAGIC)) {
106 // volume_id_set_label_raw(id, vs->s_fname, 6);
107 volume_id_set_label_string(id, vs->s_fname, 6);
108 IF_FEATURE_BLKID_TYPE(id->type = "sysv");
109 goto found;
110 }
111 }
112
113 for (boff = 0x200; boff <= SYSV_MAX_BLOCKSIZE; boff <<= 1) {
114 xs = volume_id_get_buffer(id, off + (boff + XENIX_SUPERBLOCK_BLOCK), 0x200);
115 if (xs == NULL)
116 return -1;
117
118 if (xs->s_magic == cpu_to_le32(XENIX_MAGIC) || xs->s_magic == cpu_to_be32(XENIX_MAGIC)) {
119 // volume_id_set_label_raw(id, xs->s_fname, 6);
120 volume_id_set_label_string(id, xs->s_fname, 6);
121 IF_FEATURE_BLKID_TYPE(id->type = "xenix";)
122 goto found;
123 }
124 }
125
126 return -1;
127
128 found:
129 // volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
130 return 0;
131 }
132