Magellan Linux

Contents of /trunk/mkinitrd-magellan/busybox/util-linux/volume_id/sysv.c

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Revision 816 - (show annotations) (download)
Fri Apr 24 18:33:46 2009 UTC (15 years, 1 month ago) by niro
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-updated to busybox-1.13.4
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
21 #include "volume_id_internal.h"
22
23 #define SYSV_NICINOD 100
24 #define SYSV_NICFREE 50
25
26 struct sysv_super
27 {
28 uint16_t s_isize;
29 uint16_t s_pad0;
30 uint32_t s_fsize;
31 uint16_t s_nfree;
32 uint16_t s_pad1;
33 uint32_t s_free[SYSV_NICFREE];
34 uint16_t s_ninode;
35 uint16_t s_pad2;
36 uint16_t s_inode[SYSV_NICINOD];
37 uint8_t s_flock;
38 uint8_t s_ilock;
39 uint8_t s_fmod;
40 uint8_t s_ronly;
41 uint32_t s_time;
42 uint16_t s_dinfo[4];
43 uint32_t s_tfree;
44 uint16_t s_tinode;
45 uint16_t s_pad3;
46 uint8_t s_fname[6];
47 uint8_t s_fpack[6];
48 uint32_t s_fill[12];
49 uint32_t s_state;
50 uint32_t s_magic;
51 uint32_t s_type;
52 } __attribute__((__packed__));
53
54 #define XENIX_NICINOD 100
55 #define XENIX_NICFREE 100
56
57 struct xenix_super {
58 uint16_t s_isize;
59 uint32_t s_fsize;
60 uint16_t s_nfree;
61 uint32_t s_free[XENIX_NICFREE];
62 uint16_t s_ninode;
63 uint16_t s_inode[XENIX_NICINOD];
64 uint8_t s_flock;
65 uint8_t s_ilock;
66 uint8_t s_fmod;
67 uint8_t s_ronly;
68 uint32_t s_time;
69 uint32_t s_tfree;
70 uint16_t s_tinode;
71 uint16_t s_dinfo[4];
72 uint8_t s_fname[6];
73 uint8_t s_fpack[6];
74 uint8_t s_clean;
75 uint8_t s_fill[371];
76 uint32_t s_magic;
77 uint32_t s_type;
78 } __attribute__((__packed__));
79
80 #define SYSV_SUPERBLOCK_BLOCK 0x01
81 #define SYSV_MAGIC 0xfd187e20
82 #define XENIX_SUPERBLOCK_BLOCK 0x18
83 #define XENIX_MAGIC 0x2b5544
84 #define SYSV_MAX_BLOCKSIZE 0x800
85
86 int volume_id_probe_sysv(struct volume_id *id, uint64_t off)
87 {
88 struct sysv_super *vs;
89 struct xenix_super *xs;
90 unsigned boff;
91
92 dbg("probing at offset 0x%llx", (unsigned long long) off);
93
94 for (boff = 0x200; boff <= SYSV_MAX_BLOCKSIZE; boff <<= 1) {
95 vs = volume_id_get_buffer(id, off + (boff * SYSV_SUPERBLOCK_BLOCK), 0x200);
96 if (vs == NULL)
97 return -1;
98
99 if (vs->s_magic == cpu_to_le32(SYSV_MAGIC) || vs->s_magic == cpu_to_be32(SYSV_MAGIC)) {
100 // volume_id_set_label_raw(id, vs->s_fname, 6);
101 volume_id_set_label_string(id, vs->s_fname, 6);
102 // id->type = "sysv";
103 goto found;
104 }
105 }
106
107 for (boff = 0x200; boff <= SYSV_MAX_BLOCKSIZE; boff <<= 1) {
108 xs = volume_id_get_buffer(id, off + (boff + XENIX_SUPERBLOCK_BLOCK), 0x200);
109 if (xs == NULL)
110 return -1;
111
112 if (xs->s_magic == cpu_to_le32(XENIX_MAGIC) || xs->s_magic == cpu_to_be32(XENIX_MAGIC)) {
113 // volume_id_set_label_raw(id, xs->s_fname, 6);
114 volume_id_set_label_string(id, xs->s_fname, 6);
115 // id->type = "xenix";
116 goto found;
117 }
118 }
119
120 return -1;
121
122 found:
123 // volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
124 return 0;
125 }