1 /*
2 * unixware partition parsing code
3 *
4 * Copyright (C) 2009 Karel Zak <kzak@redhat.com>
5 *
6 * This file may be redistributed under the terms of the
7 * GNU Lesser General Public License.
8 *
9 *
10 * The interesting information about unixware PT:
11 * - Linux kernel / partx
12 * - vtoc(7) SCO UNIX command man page
13 * - evms source code (http://evms.sourceforge.net/)
14 * - vxtools source code (http://martin.hinner.info/fs/vxfs/)
15 */
16 #include <stdio.h>
17 #include <string.h>
18 #include <stdlib.h>
19 #include <stdint.h>
20
21 #include "partitions.h"
22
23 /* disklabel location */
24 #define UNIXWARE_SECTOR 29
25 #define UNIXWARE_OFFSET (UNIXWARE_SECTOR << 9) /* offset in bytes */
26 #define UNIXWARE_KBOFFSET (UNIXWARE_OFFSET >> 10) /* offset in 1024-blocks */
27
28 /* disklabel->d_magic offset within the last 1024 block */
29 #define UNIXWARE_MAGICOFFSET (UNIXWARE_OFFSET - UNIXWARE_KBOFFSET + 4)
30
31 #define UNIXWARE_VTOCMAGIC 0x600DDEEEUL
32 #define UNIXWARE_MAXPARTITIONS 16
33
34 /* unixware_partition->s_label flags */
35 #define UNIXWARE_TAG_UNUSED 0x0000 /* unused partition */
36 #define UNIXWARE_TAG_BOOT 0x0001 /* boot fs */
37 #define UNIXWARE_TAG_ROOT 0x0002 /* root fs */
38 #define UNIXWARE_TAG_SWAP 0x0003 /* swap fs */
39 #define UNIXWARE_TAG_USER 0x0004 /* user fs */
40 #define UNIXWARE_TAG_ENTIRE_DISK 0x0005 /* whole disk */
41 #define UNIXWARE_TAG_ALT_S 0x0006 /* alternate sector space */
42 #define UNIXWARE_TAG_OTHER 0x0007 /* non unix */
43 #define UNIXWARE_TAG_ALT_T 0x0008 /* alternate track space */
44 #define UNIXWARE_TAG_STAND 0x0009 /* stand partition */
45 #define UNIXWARE_TAG_VAR 0x000a /* var partition */
46 #define UNIXWARE_TAG_HOME 0x000b /* home partition */
47 #define UNIXWARE_TAG_DUMP 0x000c /* dump partition */
48 #define UNIXWARE_TAG_ALT_ST 0x000d /* alternate sector track */
49 #define UNIXWARE_TAG_VM_PUBLIC 0x000e /* volume mgt public partition */
50 #define UNIXWARE_TAG_VM_PRIVATE 0x000f /* volume mgt private partition */
51
52
53 /* unixware_partition->s_flags flags */
54 #define UNIXWARE_FLAG_VALID 0x0200
55
56 struct unixware_partition {
57 uint16_t s_label; /* partition label (tag) */
58 uint16_t s_flags; /* permission flags */
59 uint32_t start_sect; /* starting sector */
60 uint32_t nr_sects; /* number of sectors */
61 } __attribute__((packed));
62
63 struct unixware_disklabel {
64 uint32_t d_type; /* drive type */
65 uint32_t d_magic; /* the magic number */
66 uint32_t d_version; /* version number */
67 char d_serial[12]; /* serial number of the device */
68 uint32_t d_ncylinders; /* # of data cylinders per device */
69 uint32_t d_ntracks; /* # of tracks per cylinder */
70 uint32_t d_nsectors; /* # of data sectors per track */
71 uint32_t d_secsize; /* # of bytes per sector */
72 uint32_t d_part_start; /* # of first sector of this partition */
73 uint32_t d_unknown1[12]; /* ? */
74 uint32_t d_alt_tbl; /* byte offset of alternate table */
75 uint32_t d_alt_len; /* byte length of alternate table */
76 uint32_t d_phys_cyl; /* # of physical cylinders per device */
77 uint32_t d_phys_trk; /* # of physical tracks per cylinder */
78 uint32_t d_phys_sec; /* # of physical sectors per track */
79 uint32_t d_phys_bytes; /* # of physical bytes per sector */
80 uint32_t d_unknown2; /* ? */
81 uint32_t d_unknown3; /* ? */
82 uint32_t d_pad[8]; /* pad */
83
84 struct unixware_vtoc {
85 uint32_t v_magic; /* the magic number */
86 uint32_t v_version; /* version number */
87 char v_name[8]; /* volume name */
88 uint16_t v_nslices; /* # of partitions */
89 uint16_t v_unknown1; /* ? */
90 uint32_t v_reserved[10]; /* reserved */
91
92 struct unixware_partition
93 v_slice[UNIXWARE_MAXPARTITIONS]; /* partition */
94 } __attribute__((packed)) vtoc;
95 };
96
97 static int probe_unixware_pt(blkid_probe pr,
98 const struct blkid_idmag *mag __attribute__((__unused__)))
99 {
100 struct unixware_disklabel *l;
101 struct unixware_partition *p;
102 blkid_parttable tab = NULL;
103 blkid_partition parent;
104 blkid_partlist ls;
105 int i;
106
107 l = (struct unixware_disklabel *)
108 blkid_probe_get_sector(pr, UNIXWARE_SECTOR);
109 if (!l) {
110 if (errno)
111 return -errno;
112 goto nothing;
113 }
114
115 if (le32_to_cpu(l->vtoc.v_magic) != UNIXWARE_VTOCMAGIC)
116 goto nothing;
117
118 if (blkid_partitions_need_typeonly(pr))
119 /* caller does not ask for details about partitions */
120 return BLKID_PROBE_OK;
121
122 ls = blkid_probe_get_partlist(pr);
123 if (!ls)
124 goto nothing;
125
126 parent = blkid_partlist_get_parent(ls);
127
128 tab = blkid_partlist_new_parttable(ls, "unixware", UNIXWARE_OFFSET);
129 if (!tab)
130 goto err;
131
132 /* Skip the first partition that describe whole disk
133 */
134 for (i = 1, p = &l->vtoc.v_slice[1];
135 i < UNIXWARE_MAXPARTITIONS; i++, p++) {
136
137 uint32_t start, size;
138 uint16_t tag, flg;
139 blkid_partition par;
140
141 tag = le16_to_cpu(p->s_label);
142 flg = le16_to_cpu(p->s_flags);
143
144 if (tag == UNIXWARE_TAG_UNUSED ||
145 tag == UNIXWARE_TAG_ENTIRE_DISK ||
146 flg != UNIXWARE_FLAG_VALID)
147 continue;
148
149 start = le32_to_cpu(p->start_sect);
150 size = le32_to_cpu(p->nr_sects);
151
152 if (parent && !blkid_is_nested_dimension(parent, start, size)) {
153 DBG(LOWPROBE, ul_debug(
154 "WARNING: unixware partition (%d) overflow "
155 "detected, ignore", i));
156 continue;
157 }
158
159 par = blkid_partlist_add_partition(ls, tab, start, size);
160 if (!par)
161 goto err;
162
163 blkid_partition_set_type(par, tag);
164 blkid_partition_set_flags(par, flg);
165 }
166
167 return BLKID_PROBE_OK;
168
169 nothing:
170 return BLKID_PROBE_NONE;
171 err:
172 return -ENOMEM;
173 }
174
175
176 /*
177 * The unixware partition table is within primary DOS partition. The PT is
178 * located on 29 sector, PT magic string is d_magic member of 'struct
179 * unixware_disklabel'.
180 */
181 const struct blkid_idinfo unixware_pt_idinfo =
182 {
183 .name = "unixware",
184 .probefunc = probe_unixware_pt,
185 .minsz = 1024 * 1440 + 1, /* ignore floppies */
186 .magics =
187 {
188 {
189 .magic = "\x0D\x60\xE5\xCA", /* little-endian magic string */
190 .len = 4, /* d_magic size in bytes */
191 .kboff = UNIXWARE_KBOFFSET,
192 .sboff = UNIXWARE_MAGICOFFSET
193 },
194 { NULL }
195 }
196 };
197