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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | /* |
3 | * fs/partitions/msdos.c | |
4 | * | |
5 | * Code extracted from drivers/block/genhd.c | |
6 | * Copyright (C) 1991-1998 Linus Torvalds | |
7 | * | |
8 | * Thanks to Branko Lankester, lankeste@fwi.uva.nl, who found a bug | |
9 | * in the early extended-partition checks and added DM partitions | |
10 | * | |
11 | * Support for DiskManager v6.0x added by Mark Lord, | |
12 | * with information provided by OnTrack. This now works for linux fdisk | |
13 | * and LILO, as well as loadlin and bootln. Note that disks other than | |
14 | * /dev/hda *must* have a "DOS" type 0x51 partition in the first slot (hda1). | |
15 | * | |
16 | * More flexible handling of extended partitions - aeb, 950831 | |
17 | * | |
18 | * Check partition table on IDE disks for common CHS translations | |
19 | * | |
20 | * Re-organised Feb 1998 Russell King | |
3f4fc59c CH |
21 | * |
22 | * BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il> | |
23 | * updated by Marc Espie <Marc.Espie@openbsd.org> | |
24 | * | |
25 | * Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl> | |
26 | * and Krzysztof G. Baranowski <kgb@knm.org.pl> | |
1da177e4 | 27 | */ |
0607fd02 | 28 | #include <linux/msdos_fs.h> |
1442f76d | 29 | #include <linux/msdos_partition.h> |
1da177e4 LT |
30 | |
31 | #include "check.h" | |
1da177e4 LT |
32 | #include "efi.h" |
33 | ||
34 | /* | |
35 | * Many architectures don't like unaligned accesses, while | |
36 | * the nr_sects and start_sect partition table entries are | |
37 | * at a 2 (mod 4) address. | |
38 | */ | |
39 | #include <asm/unaligned.h> | |
40 | ||
3fbf586c | 41 | #define SYS_IND(p) get_unaligned(&p->sys_ind) |
1da177e4 | 42 | |
1442f76d | 43 | static inline sector_t nr_sects(struct msdos_partition *p) |
3fbf586c DT |
44 | { |
45 | return (sector_t)get_unaligned_le32(&p->nr_sects); | |
46 | } | |
47 | ||
1442f76d | 48 | static inline sector_t start_sect(struct msdos_partition *p) |
3fbf586c DT |
49 | { |
50 | return (sector_t)get_unaligned_le32(&p->start_sect); | |
51 | } | |
1da177e4 | 52 | |
1442f76d | 53 | static inline int is_extended_partition(struct msdos_partition *p) |
1da177e4 LT |
54 | { |
55 | return (SYS_IND(p) == DOS_EXTENDED_PARTITION || | |
56 | SYS_IND(p) == WIN98_EXTENDED_PARTITION || | |
57 | SYS_IND(p) == LINUX_EXTENDED_PARTITION); | |
58 | } | |
59 | ||
60 | #define MSDOS_LABEL_MAGIC1 0x55 | |
61 | #define MSDOS_LABEL_MAGIC2 0xAA | |
62 | ||
63 | static inline int | |
64 | msdos_magic_present(unsigned char *p) | |
65 | { | |
66 | return (p[0] == MSDOS_LABEL_MAGIC1 && p[1] == MSDOS_LABEL_MAGIC2); | |
67 | } | |
68 | ||
e1dfa92d OH |
69 | /* Value is EBCDIC 'IBMA' */ |
70 | #define AIX_LABEL_MAGIC1 0xC9 | |
71 | #define AIX_LABEL_MAGIC2 0xC2 | |
72 | #define AIX_LABEL_MAGIC3 0xD4 | |
73 | #define AIX_LABEL_MAGIC4 0xC1 | |
1493bf21 | 74 | static int aix_magic_present(struct parsed_partitions *state, unsigned char *p) |
e1dfa92d | 75 | { |
1442f76d | 76 | struct msdos_partition *pt = (struct msdos_partition *) (p + 0x1be); |
e1dfa92d OH |
77 | Sector sect; |
78 | unsigned char *d; | |
4419d1ac | 79 | int slot, ret = 0; |
e1dfa92d | 80 | |
a470e18f OH |
81 | if (!(p[0] == AIX_LABEL_MAGIC1 && |
82 | p[1] == AIX_LABEL_MAGIC2 && | |
83 | p[2] == AIX_LABEL_MAGIC3 && | |
84 | p[3] == AIX_LABEL_MAGIC4)) | |
e1dfa92d | 85 | return 0; |
cb0ab526 CH |
86 | |
87 | /* | |
88 | * Assume the partition table is valid if Linux partitions exists. | |
89 | * Note that old Solaris/x86 partitions use the same indicator as | |
90 | * Linux swap partitions, so we consider that a Linux partition as | |
91 | * well. | |
92 | */ | |
4419d1ac | 93 | for (slot = 1; slot <= 4; slot++, pt++) { |
cb0ab526 CH |
94 | if (pt->sys_ind == SOLARIS_X86_PARTITION || |
95 | pt->sys_ind == LINUX_RAID_PARTITION || | |
96 | pt->sys_ind == LINUX_DATA_PARTITION || | |
97 | pt->sys_ind == LINUX_LVM_PARTITION || | |
98 | is_extended_partition(pt)) | |
4419d1ac OH |
99 | return 0; |
100 | } | |
1493bf21 | 101 | d = read_part_sector(state, 7, §); |
e1dfa92d OH |
102 | if (d) { |
103 | if (d[0] == '_' && d[1] == 'L' && d[2] == 'V' && d[3] == 'M') | |
104 | ret = 1; | |
105 | put_dev_sector(sect); | |
1d04f3c6 | 106 | } |
e1dfa92d OH |
107 | return ret; |
108 | } | |
109 | ||
d33b98fc SW |
110 | static void set_info(struct parsed_partitions *state, int slot, |
111 | u32 disksig) | |
112 | { | |
113 | struct partition_meta_info *info = &state->parts[slot].info; | |
114 | ||
115 | snprintf(info->uuid, sizeof(info->uuid), "%08x-%02x", disksig, | |
116 | slot); | |
117 | info->volname[0] = 0; | |
118 | state->parts[slot].has_info = true; | |
119 | } | |
120 | ||
1da177e4 LT |
121 | /* |
122 | * Create devices for each logical partition in an extended partition. | |
123 | * The logical partitions form a linked list, with each entry being | |
124 | * a partition table with two entries. The first entry | |
125 | * is the real data partition (with a start relative to the partition | |
126 | * table start). The second is a pointer to the next logical partition | |
127 | * (with a start relative to the entire extended partition). | |
128 | * We do not create a Linux partition for the partition tables, but | |
129 | * only for the actual data partitions. | |
130 | */ | |
131 | ||
1493bf21 | 132 | static void parse_extended(struct parsed_partitions *state, |
d33b98fc SW |
133 | sector_t first_sector, sector_t first_size, |
134 | u32 disksig) | |
1da177e4 | 135 | { |
1442f76d | 136 | struct msdos_partition *p; |
1da177e4 LT |
137 | Sector sect; |
138 | unsigned char *data; | |
3fbf586c | 139 | sector_t this_sector, this_size; |
1493bf21 | 140 | sector_t sector_size = bdev_logical_block_size(state->bdev) / 512; |
1da177e4 LT |
141 | int loopct = 0; /* number of links followed |
142 | without finding a data partition */ | |
143 | int i; | |
144 | ||
145 | this_sector = first_sector; | |
146 | this_size = first_size; | |
147 | ||
148 | while (1) { | |
149 | if (++loopct > 100) | |
150 | return; | |
151 | if (state->next == state->limit) | |
152 | return; | |
1493bf21 | 153 | data = read_part_sector(state, this_sector, §); |
1da177e4 LT |
154 | if (!data) |
155 | return; | |
156 | ||
157 | if (!msdos_magic_present(data + 510)) | |
1d04f3c6 | 158 | goto done; |
1da177e4 | 159 | |
1442f76d | 160 | p = (struct msdos_partition *) (data + 0x1be); |
1da177e4 LT |
161 | |
162 | /* | |
163 | * Usually, the first entry is the real data partition, | |
164 | * the 2nd entry is the next extended partition, or empty, | |
165 | * and the 3rd and 4th entries are unused. | |
166 | * However, DRDOS sometimes has the extended partition as | |
167 | * the first entry (when the data partition is empty), | |
168 | * and OS/2 seems to use all four entries. | |
169 | */ | |
170 | ||
1d04f3c6 | 171 | /* |
1da177e4 LT |
172 | * First process the data partition(s) |
173 | */ | |
dce14c23 | 174 | for (i = 0; i < 4; i++, p++) { |
3fbf586c | 175 | sector_t offs, size, next; |
dce14c23 | 176 | |
3fbf586c | 177 | if (!nr_sects(p) || is_extended_partition(p)) |
1da177e4 LT |
178 | continue; |
179 | ||
180 | /* Check the 3rd and 4th entries - | |
181 | these sometimes contain random garbage */ | |
3fbf586c DT |
182 | offs = start_sect(p)*sector_size; |
183 | size = nr_sects(p)*sector_size; | |
1da177e4 LT |
184 | next = this_sector + offs; |
185 | if (i >= 2) { | |
186 | if (offs + size > this_size) | |
187 | continue; | |
188 | if (next < first_sector) | |
189 | continue; | |
190 | if (next + size > first_sector + first_size) | |
191 | continue; | |
192 | } | |
193 | ||
194 | put_partition(state, state->next, next, size); | |
d33b98fc | 195 | set_info(state, state->next, disksig); |
1da177e4 | 196 | if (SYS_IND(p) == LINUX_RAID_PARTITION) |
d18d7682 | 197 | state->parts[state->next].flags = ADDPART_FLAG_RAID; |
1da177e4 LT |
198 | loopct = 0; |
199 | if (++state->next == state->limit) | |
200 | goto done; | |
201 | } | |
202 | /* | |
203 | * Next, process the (first) extended partition, if present. | |
204 | * (So far, there seems to be no reason to make | |
205 | * parse_extended() recursive and allow a tree | |
206 | * of extended partitions.) | |
207 | * It should be a link to the next logical partition. | |
208 | */ | |
209 | p -= 4; | |
dce14c23 | 210 | for (i = 0; i < 4; i++, p++) |
3fbf586c | 211 | if (nr_sects(p) && is_extended_partition(p)) |
1da177e4 LT |
212 | break; |
213 | if (i == 4) | |
214 | goto done; /* nothing left to do */ | |
215 | ||
3fbf586c DT |
216 | this_sector = first_sector + start_sect(p) * sector_size; |
217 | this_size = nr_sects(p) * sector_size; | |
1da177e4 LT |
218 | put_dev_sector(sect); |
219 | } | |
220 | done: | |
221 | put_dev_sector(sect); | |
222 | } | |
223 | ||
3f4fc59c CH |
224 | #define SOLARIS_X86_NUMSLICE 16 |
225 | #define SOLARIS_X86_VTOC_SANE (0x600DDEEEUL) | |
226 | ||
227 | struct solaris_x86_slice { | |
228 | __le16 s_tag; /* ID tag of partition */ | |
229 | __le16 s_flag; /* permission flags */ | |
230 | __le32 s_start; /* start sector no of partition */ | |
231 | __le32 s_size; /* # of blocks in partition */ | |
232 | }; | |
233 | ||
234 | struct solaris_x86_vtoc { | |
235 | unsigned int v_bootinfo[3]; /* info needed by mboot */ | |
236 | __le32 v_sanity; /* to verify vtoc sanity */ | |
237 | __le32 v_version; /* layout version */ | |
238 | char v_volume[8]; /* volume name */ | |
239 | __le16 v_sectorsz; /* sector size in bytes */ | |
240 | __le16 v_nparts; /* number of partitions */ | |
241 | unsigned int v_reserved[10]; /* free space */ | |
242 | struct solaris_x86_slice | |
243 | v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */ | |
244 | unsigned int timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp */ | |
245 | char v_asciilabel[128]; /* for compatibility */ | |
246 | }; | |
247 | ||
1da177e4 LT |
248 | /* james@bpgc.com: Solaris has a nasty indicator: 0x82 which also |
249 | indicates linux swap. Be careful before believing this is Solaris. */ | |
250 | ||
1493bf21 TH |
251 | static void parse_solaris_x86(struct parsed_partitions *state, |
252 | sector_t offset, sector_t size, int origin) | |
1da177e4 LT |
253 | { |
254 | #ifdef CONFIG_SOLARIS_X86_PARTITION | |
255 | Sector sect; | |
256 | struct solaris_x86_vtoc *v; | |
257 | int i; | |
b84d8796 | 258 | short max_nparts; |
1da177e4 | 259 | |
1493bf21 | 260 | v = read_part_sector(state, offset + 1, §); |
1da177e4 LT |
261 | if (!v) |
262 | return; | |
263 | if (le32_to_cpu(v->v_sanity) != SOLARIS_X86_VTOC_SANE) { | |
264 | put_dev_sector(sect); | |
265 | return; | |
266 | } | |
9c867fbe AD |
267 | { |
268 | char tmp[1 + BDEVNAME_SIZE + 10 + 11 + 1]; | |
269 | ||
270 | snprintf(tmp, sizeof(tmp), " %s%d: <solaris:", state->name, origin); | |
271 | strlcat(state->pp_buf, tmp, PAGE_SIZE); | |
272 | } | |
1da177e4 | 273 | if (le32_to_cpu(v->v_version) != 1) { |
9c867fbe AD |
274 | char tmp[64]; |
275 | ||
276 | snprintf(tmp, sizeof(tmp), " cannot handle version %d vtoc>\n", | |
277 | le32_to_cpu(v->v_version)); | |
278 | strlcat(state->pp_buf, tmp, PAGE_SIZE); | |
1da177e4 LT |
279 | put_dev_sector(sect); |
280 | return; | |
281 | } | |
b84d8796 | 282 | /* Ensure we can handle previous case of VTOC with 8 entries gracefully */ |
dce14c23 FF |
283 | max_nparts = le16_to_cpu(v->v_nparts) > 8 ? SOLARIS_X86_NUMSLICE : 8; |
284 | for (i = 0; i < max_nparts && state->next < state->limit; i++) { | |
1da177e4 | 285 | struct solaris_x86_slice *s = &v->v_slice[i]; |
9c867fbe AD |
286 | char tmp[3 + 10 + 1 + 1]; |
287 | ||
1da177e4 LT |
288 | if (s->s_size == 0) |
289 | continue; | |
9c867fbe AD |
290 | snprintf(tmp, sizeof(tmp), " [s%d]", i); |
291 | strlcat(state->pp_buf, tmp, PAGE_SIZE); | |
1da177e4 LT |
292 | /* solaris partitions are relative to current MS-DOS |
293 | * one; must add the offset of the current partition */ | |
294 | put_partition(state, state->next++, | |
295 | le32_to_cpu(s->s_start)+offset, | |
296 | le32_to_cpu(s->s_size)); | |
297 | } | |
298 | put_dev_sector(sect); | |
9c867fbe | 299 | strlcat(state->pp_buf, " >\n", PAGE_SIZE); |
1da177e4 LT |
300 | #endif |
301 | } | |
302 | ||
3f4fc59c CH |
303 | /* check against BSD src/sys/sys/disklabel.h for consistency */ |
304 | #define BSD_DISKMAGIC (0x82564557UL) /* The disk magic number */ | |
305 | #define BSD_MAXPARTITIONS 16 | |
306 | #define OPENBSD_MAXPARTITIONS 16 | |
307 | #define BSD_FS_UNUSED 0 /* disklabel unused partition entry ID */ | |
308 | struct bsd_disklabel { | |
309 | __le32 d_magic; /* the magic number */ | |
310 | __s16 d_type; /* drive type */ | |
311 | __s16 d_subtype; /* controller/d_type specific */ | |
312 | char d_typename[16]; /* type name, e.g. "eagle" */ | |
313 | char d_packname[16]; /* pack identifier */ | |
314 | __u32 d_secsize; /* # of bytes per sector */ | |
315 | __u32 d_nsectors; /* # of data sectors per track */ | |
316 | __u32 d_ntracks; /* # of tracks per cylinder */ | |
317 | __u32 d_ncylinders; /* # of data cylinders per unit */ | |
318 | __u32 d_secpercyl; /* # of data sectors per cylinder */ | |
319 | __u32 d_secperunit; /* # of data sectors per unit */ | |
320 | __u16 d_sparespertrack; /* # of spare sectors per track */ | |
321 | __u16 d_sparespercyl; /* # of spare sectors per cylinder */ | |
322 | __u32 d_acylinders; /* # of alt. cylinders per unit */ | |
323 | __u16 d_rpm; /* rotational speed */ | |
324 | __u16 d_interleave; /* hardware sector interleave */ | |
325 | __u16 d_trackskew; /* sector 0 skew, per track */ | |
326 | __u16 d_cylskew; /* sector 0 skew, per cylinder */ | |
327 | __u32 d_headswitch; /* head switch time, usec */ | |
328 | __u32 d_trkseek; /* track-to-track seek, usec */ | |
329 | __u32 d_flags; /* generic flags */ | |
330 | #define NDDATA 5 | |
331 | __u32 d_drivedata[NDDATA]; /* drive-type specific information */ | |
332 | #define NSPARE 5 | |
333 | __u32 d_spare[NSPARE]; /* reserved for future use */ | |
334 | __le32 d_magic2; /* the magic number (again) */ | |
335 | __le16 d_checksum; /* xor of data incl. partitions */ | |
336 | ||
337 | /* filesystem and partition information: */ | |
338 | __le16 d_npartitions; /* number of partitions in following */ | |
339 | __le32 d_bbsize; /* size of boot area at sn0, bytes */ | |
340 | __le32 d_sbsize; /* max size of fs superblock, bytes */ | |
341 | struct bsd_partition { /* the partition table */ | |
342 | __le32 p_size; /* number of sectors in partition */ | |
343 | __le32 p_offset; /* starting sector */ | |
344 | __le32 p_fsize; /* filesystem basic fragment size */ | |
345 | __u8 p_fstype; /* filesystem type, see below */ | |
346 | __u8 p_frag; /* filesystem fragments per block */ | |
347 | __le16 p_cpg; /* filesystem cylinders per group */ | |
348 | } d_partitions[BSD_MAXPARTITIONS]; /* actually may be more */ | |
349 | }; | |
350 | ||
486fd404 | 351 | #if defined(CONFIG_BSD_DISKLABEL) |
1d04f3c6 | 352 | /* |
1da177e4 LT |
353 | * Create devices for BSD partitions listed in a disklabel, under a |
354 | * dos-like partition. See parse_extended() for more information. | |
355 | */ | |
1493bf21 TH |
356 | static void parse_bsd(struct parsed_partitions *state, |
357 | sector_t offset, sector_t size, int origin, char *flavour, | |
358 | int max_partitions) | |
1da177e4 LT |
359 | { |
360 | Sector sect; | |
361 | struct bsd_disklabel *l; | |
362 | struct bsd_partition *p; | |
9c867fbe | 363 | char tmp[64]; |
1da177e4 | 364 | |
1493bf21 | 365 | l = read_part_sector(state, offset + 1, §); |
1da177e4 LT |
366 | if (!l) |
367 | return; | |
368 | if (le32_to_cpu(l->d_magic) != BSD_DISKMAGIC) { | |
369 | put_dev_sector(sect); | |
370 | return; | |
371 | } | |
9c867fbe AD |
372 | |
373 | snprintf(tmp, sizeof(tmp), " %s%d: <%s:", state->name, origin, flavour); | |
374 | strlcat(state->pp_buf, tmp, PAGE_SIZE); | |
1da177e4 LT |
375 | |
376 | if (le16_to_cpu(l->d_npartitions) < max_partitions) | |
377 | max_partitions = le16_to_cpu(l->d_npartitions); | |
378 | for (p = l->d_partitions; p - l->d_partitions < max_partitions; p++) { | |
3fbf586c | 379 | sector_t bsd_start, bsd_size; |
1da177e4 LT |
380 | |
381 | if (state->next == state->limit) | |
382 | break; | |
1d04f3c6 | 383 | if (p->p_fstype == BSD_FS_UNUSED) |
1da177e4 LT |
384 | continue; |
385 | bsd_start = le32_to_cpu(p->p_offset); | |
386 | bsd_size = le32_to_cpu(p->p_size); | |
5f15684b RN |
387 | /* FreeBSD has relative offset if C partition offset is zero */ |
388 | if (memcmp(flavour, "bsd\0", 4) == 0 && | |
389 | le32_to_cpu(l->d_partitions[2].p_offset) == 0) | |
22322035 | 390 | bsd_start += offset; |
1da177e4 LT |
391 | if (offset == bsd_start && size == bsd_size) |
392 | /* full parent partition, we have it already */ | |
393 | continue; | |
394 | if (offset > bsd_start || offset+size < bsd_start+bsd_size) { | |
9c867fbe | 395 | strlcat(state->pp_buf, "bad subpartition - ignored\n", PAGE_SIZE); |
1da177e4 LT |
396 | continue; |
397 | } | |
398 | put_partition(state, state->next++, bsd_start, bsd_size); | |
399 | } | |
400 | put_dev_sector(sect); | |
9c867fbe AD |
401 | if (le16_to_cpu(l->d_npartitions) > max_partitions) { |
402 | snprintf(tmp, sizeof(tmp), " (ignored %d more)", | |
403 | le16_to_cpu(l->d_npartitions) - max_partitions); | |
404 | strlcat(state->pp_buf, tmp, PAGE_SIZE); | |
405 | } | |
406 | strlcat(state->pp_buf, " >\n", PAGE_SIZE); | |
1da177e4 LT |
407 | } |
408 | #endif | |
409 | ||
1493bf21 TH |
410 | static void parse_freebsd(struct parsed_partitions *state, |
411 | sector_t offset, sector_t size, int origin) | |
1da177e4 LT |
412 | { |
413 | #ifdef CONFIG_BSD_DISKLABEL | |
1493bf21 | 414 | parse_bsd(state, offset, size, origin, "bsd", BSD_MAXPARTITIONS); |
1da177e4 LT |
415 | #endif |
416 | } | |
417 | ||
1493bf21 TH |
418 | static void parse_netbsd(struct parsed_partitions *state, |
419 | sector_t offset, sector_t size, int origin) | |
1da177e4 LT |
420 | { |
421 | #ifdef CONFIG_BSD_DISKLABEL | |
1493bf21 | 422 | parse_bsd(state, offset, size, origin, "netbsd", BSD_MAXPARTITIONS); |
1da177e4 LT |
423 | #endif |
424 | } | |
425 | ||
1493bf21 TH |
426 | static void parse_openbsd(struct parsed_partitions *state, |
427 | sector_t offset, sector_t size, int origin) | |
1da177e4 LT |
428 | { |
429 | #ifdef CONFIG_BSD_DISKLABEL | |
1493bf21 TH |
430 | parse_bsd(state, offset, size, origin, "openbsd", |
431 | OPENBSD_MAXPARTITIONS); | |
1da177e4 LT |
432 | #endif |
433 | } | |
434 | ||
3f4fc59c CH |
435 | #define UNIXWARE_DISKMAGIC (0xCA5E600DUL) /* The disk magic number */ |
436 | #define UNIXWARE_DISKMAGIC2 (0x600DDEEEUL) /* The slice table magic nr */ | |
437 | #define UNIXWARE_NUMSLICE 16 | |
438 | #define UNIXWARE_FS_UNUSED 0 /* Unused slice entry ID */ | |
439 | ||
440 | struct unixware_slice { | |
441 | __le16 s_label; /* label */ | |
442 | __le16 s_flags; /* permission flags */ | |
443 | __le32 start_sect; /* starting sector */ | |
444 | __le32 nr_sects; /* number of sectors in slice */ | |
445 | }; | |
446 | ||
447 | struct unixware_disklabel { | |
448 | __le32 d_type; /* drive type */ | |
449 | __le32 d_magic; /* the magic number */ | |
450 | __le32 d_version; /* version number */ | |
451 | char d_serial[12]; /* serial number of the device */ | |
452 | __le32 d_ncylinders; /* # of data cylinders per device */ | |
453 | __le32 d_ntracks; /* # of tracks per cylinder */ | |
454 | __le32 d_nsectors; /* # of data sectors per track */ | |
455 | __le32 d_secsize; /* # of bytes per sector */ | |
456 | __le32 d_part_start; /* # of first sector of this partition*/ | |
457 | __le32 d_unknown1[12]; /* ? */ | |
458 | __le32 d_alt_tbl; /* byte offset of alternate table */ | |
459 | __le32 d_alt_len; /* byte length of alternate table */ | |
460 | __le32 d_phys_cyl; /* # of physical cylinders per device */ | |
461 | __le32 d_phys_trk; /* # of physical tracks per cylinder */ | |
462 | __le32 d_phys_sec; /* # of physical sectors per track */ | |
463 | __le32 d_phys_bytes; /* # of physical bytes per sector */ | |
464 | __le32 d_unknown2; /* ? */ | |
465 | __le32 d_unknown3; /* ? */ | |
466 | __le32 d_pad[8]; /* pad */ | |
467 | ||
468 | struct unixware_vtoc { | |
469 | __le32 v_magic; /* the magic number */ | |
470 | __le32 v_version; /* version number */ | |
471 | char v_name[8]; /* volume name */ | |
472 | __le16 v_nslices; /* # of slices */ | |
473 | __le16 v_unknown1; /* ? */ | |
474 | __le32 v_reserved[10]; /* reserved */ | |
475 | struct unixware_slice | |
476 | v_slice[UNIXWARE_NUMSLICE]; /* slice headers */ | |
477 | } vtoc; | |
478 | }; /* 408 */ | |
479 | ||
1da177e4 LT |
480 | /* |
481 | * Create devices for Unixware partitions listed in a disklabel, under a | |
482 | * dos-like partition. See parse_extended() for more information. | |
483 | */ | |
1493bf21 TH |
484 | static void parse_unixware(struct parsed_partitions *state, |
485 | sector_t offset, sector_t size, int origin) | |
1da177e4 LT |
486 | { |
487 | #ifdef CONFIG_UNIXWARE_DISKLABEL | |
488 | Sector sect; | |
489 | struct unixware_disklabel *l; | |
490 | struct unixware_slice *p; | |
491 | ||
1493bf21 | 492 | l = read_part_sector(state, offset + 29, §); |
1da177e4 LT |
493 | if (!l) |
494 | return; | |
495 | if (le32_to_cpu(l->d_magic) != UNIXWARE_DISKMAGIC || | |
496 | le32_to_cpu(l->vtoc.v_magic) != UNIXWARE_DISKMAGIC2) { | |
497 | put_dev_sector(sect); | |
498 | return; | |
499 | } | |
9c867fbe AD |
500 | { |
501 | char tmp[1 + BDEVNAME_SIZE + 10 + 12 + 1]; | |
502 | ||
503 | snprintf(tmp, sizeof(tmp), " %s%d: <unixware:", state->name, origin); | |
504 | strlcat(state->pp_buf, tmp, PAGE_SIZE); | |
505 | } | |
1da177e4 LT |
506 | p = &l->vtoc.v_slice[1]; |
507 | /* I omit the 0th slice as it is the same as whole disk. */ | |
508 | while (p - &l->vtoc.v_slice[0] < UNIXWARE_NUMSLICE) { | |
509 | if (state->next == state->limit) | |
510 | break; | |
511 | ||
512 | if (p->s_label != UNIXWARE_FS_UNUSED) | |
513 | put_partition(state, state->next++, | |
3fbf586c DT |
514 | le32_to_cpu(p->start_sect), |
515 | le32_to_cpu(p->nr_sects)); | |
1da177e4 LT |
516 | p++; |
517 | } | |
518 | put_dev_sector(sect); | |
9c867fbe | 519 | strlcat(state->pp_buf, " >\n", PAGE_SIZE); |
1da177e4 LT |
520 | #endif |
521 | } | |
522 | ||
3f4fc59c CH |
523 | #define MINIX_NR_SUBPARTITIONS 4 |
524 | ||
1da177e4 LT |
525 | /* |
526 | * Minix 2.0.0/2.0.2 subpartition support. | |
527 | * Anand Krishnamurthy <anandk@wiproge.med.ge.com> | |
528 | * Rajeev V. Pillai <rajeevvp@yahoo.com> | |
529 | */ | |
1493bf21 TH |
530 | static void parse_minix(struct parsed_partitions *state, |
531 | sector_t offset, sector_t size, int origin) | |
1da177e4 LT |
532 | { |
533 | #ifdef CONFIG_MINIX_SUBPARTITION | |
534 | Sector sect; | |
535 | unsigned char *data; | |
1442f76d | 536 | struct msdos_partition *p; |
1da177e4 LT |
537 | int i; |
538 | ||
1493bf21 | 539 | data = read_part_sector(state, offset, §); |
1da177e4 LT |
540 | if (!data) |
541 | return; | |
542 | ||
1442f76d | 543 | p = (struct msdos_partition *)(data + 0x1be); |
1da177e4 LT |
544 | |
545 | /* The first sector of a Minix partition can have either | |
546 | * a secondary MBR describing its subpartitions, or | |
547 | * the normal boot sector. */ | |
dce14c23 | 548 | if (msdos_magic_present(data + 510) && |
1da177e4 | 549 | SYS_IND(p) == MINIX_PARTITION) { /* subpartition table present */ |
9c867fbe | 550 | char tmp[1 + BDEVNAME_SIZE + 10 + 9 + 1]; |
1da177e4 | 551 | |
9c867fbe AD |
552 | snprintf(tmp, sizeof(tmp), " %s%d: <minix:", state->name, origin); |
553 | strlcat(state->pp_buf, tmp, PAGE_SIZE); | |
1da177e4 LT |
554 | for (i = 0; i < MINIX_NR_SUBPARTITIONS; i++, p++) { |
555 | if (state->next == state->limit) | |
556 | break; | |
557 | /* add each partition in use */ | |
558 | if (SYS_IND(p) == MINIX_PARTITION) | |
559 | put_partition(state, state->next++, | |
3fbf586c | 560 | start_sect(p), nr_sects(p)); |
1da177e4 | 561 | } |
9c867fbe | 562 | strlcat(state->pp_buf, " >\n", PAGE_SIZE); |
1da177e4 LT |
563 | } |
564 | put_dev_sector(sect); | |
565 | #endif /* CONFIG_MINIX_SUBPARTITION */ | |
566 | } | |
567 | ||
568 | static struct { | |
569 | unsigned char id; | |
1493bf21 | 570 | void (*parse)(struct parsed_partitions *, sector_t, sector_t, int); |
1da177e4 LT |
571 | } subtypes[] = { |
572 | {FREEBSD_PARTITION, parse_freebsd}, | |
573 | {NETBSD_PARTITION, parse_netbsd}, | |
574 | {OPENBSD_PARTITION, parse_openbsd}, | |
575 | {MINIX_PARTITION, parse_minix}, | |
576 | {UNIXWARE_PARTITION, parse_unixware}, | |
577 | {SOLARIS_X86_PARTITION, parse_solaris_x86}, | |
578 | {NEW_SOLARIS_X86_PARTITION, parse_solaris_x86}, | |
579 | {0, NULL}, | |
580 | }; | |
1d04f3c6 | 581 | |
1493bf21 | 582 | int msdos_partition(struct parsed_partitions *state) |
1da177e4 | 583 | { |
1493bf21 | 584 | sector_t sector_size = bdev_logical_block_size(state->bdev) / 512; |
1da177e4 LT |
585 | Sector sect; |
586 | unsigned char *data; | |
1442f76d | 587 | struct msdos_partition *p; |
0607fd02 | 588 | struct fat_boot_sector *fb; |
1da177e4 | 589 | int slot; |
d33b98fc | 590 | u32 disksig; |
1da177e4 | 591 | |
1493bf21 | 592 | data = read_part_sector(state, 0, §); |
1da177e4 LT |
593 | if (!data) |
594 | return -1; | |
86ee8ba6 PDM |
595 | |
596 | /* | |
597 | * Note order! (some AIX disks, e.g. unbootable kind, | |
598 | * have no MSDOS 55aa) | |
599 | */ | |
600 | if (aix_magic_present(state, data)) { | |
1da177e4 | 601 | put_dev_sector(sect); |
f8f06603 PDM |
602 | #ifdef CONFIG_AIX_PARTITION |
603 | return aix_partition(state); | |
604 | #else | |
86ee8ba6 | 605 | strlcat(state->pp_buf, " [AIX]", PAGE_SIZE); |
1da177e4 | 606 | return 0; |
f8f06603 | 607 | #endif |
1da177e4 LT |
608 | } |
609 | ||
86ee8ba6 | 610 | if (!msdos_magic_present(data + 510)) { |
e1dfa92d | 611 | put_dev_sector(sect); |
e1dfa92d OH |
612 | return 0; |
613 | } | |
614 | ||
1da177e4 LT |
615 | /* |
616 | * Now that the 55aa signature is present, this is probably | |
617 | * either the boot sector of a FAT filesystem or a DOS-type | |
618 | * partition table. Reject this in case the boot indicator | |
619 | * is not 0 or 0x80. | |
620 | */ | |
1442f76d | 621 | p = (struct msdos_partition *) (data + 0x1be); |
1da177e4 LT |
622 | for (slot = 1; slot <= 4; slot++, p++) { |
623 | if (p->boot_ind != 0 && p->boot_ind != 0x80) { | |
0607fd02 FS |
624 | /* |
625 | * Even without a valid boot inidicator value | |
626 | * its still possible this is valid FAT filesystem | |
627 | * without a partition table. | |
628 | */ | |
629 | fb = (struct fat_boot_sector *) data; | |
630 | if (slot == 1 && fb->reserved && fb->fats | |
631 | && fat_valid_media(fb->media)) { | |
9c867fbe | 632 | strlcat(state->pp_buf, "\n", PAGE_SIZE); |
0607fd02 FS |
633 | put_dev_sector(sect); |
634 | return 1; | |
635 | } else { | |
636 | put_dev_sector(sect); | |
637 | return 0; | |
638 | } | |
1da177e4 LT |
639 | } |
640 | } | |
641 | ||
642 | #ifdef CONFIG_EFI_PARTITION | |
1442f76d | 643 | p = (struct msdos_partition *) (data + 0x1be); |
1da177e4 LT |
644 | for (slot = 1 ; slot <= 4 ; slot++, p++) { |
645 | /* If this is an EFI GPT disk, msdos should ignore it. */ | |
646 | if (SYS_IND(p) == EFI_PMBR_OSTYPE_EFI_GPT) { | |
647 | put_dev_sector(sect); | |
648 | return 0; | |
649 | } | |
650 | } | |
651 | #endif | |
1442f76d | 652 | p = (struct msdos_partition *) (data + 0x1be); |
1da177e4 | 653 | |
d33b98fc SW |
654 | disksig = le32_to_cpup((__le32 *)(data + 0x1b8)); |
655 | ||
1da177e4 LT |
656 | /* |
657 | * Look for partitions in two passes: | |
658 | * First find the primary and DOS-type extended partitions. | |
659 | * On the second pass look inside *BSD, Unixware and Solaris partitions. | |
660 | */ | |
661 | ||
662 | state->next = 5; | |
663 | for (slot = 1 ; slot <= 4 ; slot++, p++) { | |
3fbf586c DT |
664 | sector_t start = start_sect(p)*sector_size; |
665 | sector_t size = nr_sects(p)*sector_size; | |
dce14c23 | 666 | |
1da177e4 LT |
667 | if (!size) |
668 | continue; | |
669 | if (is_extended_partition(p)) { | |
8e0cc811 OH |
670 | /* |
671 | * prevent someone doing mkfs or mkswap on an | |
672 | * extended partition, but leave room for LILO | |
673 | * FIXME: this uses one logical sector for > 512b | |
674 | * sector, although it may not be enough/proper. | |
675 | */ | |
676 | sector_t n = 2; | |
dce14c23 | 677 | |
8e0cc811 OH |
678 | n = min(size, max(sector_size, n)); |
679 | put_partition(state, slot, start, n); | |
680 | ||
9c867fbe | 681 | strlcat(state->pp_buf, " <", PAGE_SIZE); |
d33b98fc | 682 | parse_extended(state, start, size, disksig); |
9c867fbe | 683 | strlcat(state->pp_buf, " >", PAGE_SIZE); |
1da177e4 LT |
684 | continue; |
685 | } | |
686 | put_partition(state, slot, start, size); | |
d33b98fc | 687 | set_info(state, slot, disksig); |
1da177e4 | 688 | if (SYS_IND(p) == LINUX_RAID_PARTITION) |
cc910624 | 689 | state->parts[slot].flags = ADDPART_FLAG_RAID; |
1da177e4 | 690 | if (SYS_IND(p) == DM6_PARTITION) |
9c867fbe | 691 | strlcat(state->pp_buf, "[DM]", PAGE_SIZE); |
1da177e4 | 692 | if (SYS_IND(p) == EZD_PARTITION) |
9c867fbe | 693 | strlcat(state->pp_buf, "[EZD]", PAGE_SIZE); |
1da177e4 LT |
694 | } |
695 | ||
9c867fbe | 696 | strlcat(state->pp_buf, "\n", PAGE_SIZE); |
1da177e4 LT |
697 | |
698 | /* second pass - output for each on a separate line */ | |
1442f76d | 699 | p = (struct msdos_partition *) (0x1be + data); |
1da177e4 LT |
700 | for (slot = 1 ; slot <= 4 ; slot++, p++) { |
701 | unsigned char id = SYS_IND(p); | |
702 | int n; | |
703 | ||
3fbf586c | 704 | if (!nr_sects(p)) |
1da177e4 LT |
705 | continue; |
706 | ||
707 | for (n = 0; subtypes[n].parse && id != subtypes[n].id; n++) | |
708 | ; | |
709 | ||
710 | if (!subtypes[n].parse) | |
711 | continue; | |
1493bf21 TH |
712 | subtypes[n].parse(state, start_sect(p) * sector_size, |
713 | nr_sects(p) * sector_size, slot); | |
1da177e4 LT |
714 | } |
715 | put_dev_sector(sect); | |
716 | return 1; | |
717 | } |