1 | // SPDX-License-Identifier: GPL-2.0 |
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 |
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> |
27 | */ |
28 | #include <linux/msdos_fs.h> |
29 | #include <linux/msdos_partition.h> |
30 | |
31 | #include "check.h" |
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 | |
41 | static inline sector_t nr_sects(struct msdos_partition *p) |
42 | { |
43 | return (sector_t)get_unaligned_le32(p: &p->nr_sects); |
44 | } |
45 | |
46 | static inline sector_t start_sect(struct msdos_partition *p) |
47 | { |
48 | return (sector_t)get_unaligned_le32(p: &p->start_sect); |
49 | } |
50 | |
51 | static inline int is_extended_partition(struct msdos_partition *p) |
52 | { |
53 | return (p->sys_ind == DOS_EXTENDED_PARTITION || |
54 | p->sys_ind == WIN98_EXTENDED_PARTITION || |
55 | p->sys_ind == LINUX_EXTENDED_PARTITION); |
56 | } |
57 | |
58 | #define MSDOS_LABEL_MAGIC1 0x55 |
59 | #define MSDOS_LABEL_MAGIC2 0xAA |
60 | |
61 | static inline int |
62 | msdos_magic_present(unsigned char *p) |
63 | { |
64 | return (p[0] == MSDOS_LABEL_MAGIC1 && p[1] == MSDOS_LABEL_MAGIC2); |
65 | } |
66 | |
67 | /* Value is EBCDIC 'IBMA' */ |
68 | #define AIX_LABEL_MAGIC1 0xC9 |
69 | #define AIX_LABEL_MAGIC2 0xC2 |
70 | #define AIX_LABEL_MAGIC3 0xD4 |
71 | #define AIX_LABEL_MAGIC4 0xC1 |
72 | static int aix_magic_present(struct parsed_partitions *state, unsigned char *p) |
73 | { |
74 | struct msdos_partition *pt = (struct msdos_partition *) (p + 0x1be); |
75 | Sector sect; |
76 | unsigned char *d; |
77 | int slot, ret = 0; |
78 | |
79 | if (!(p[0] == AIX_LABEL_MAGIC1 && |
80 | p[1] == AIX_LABEL_MAGIC2 && |
81 | p[2] == AIX_LABEL_MAGIC3 && |
82 | p[3] == AIX_LABEL_MAGIC4)) |
83 | return 0; |
84 | |
85 | /* |
86 | * Assume the partition table is valid if Linux partitions exists. |
87 | * Note that old Solaris/x86 partitions use the same indicator as |
88 | * Linux swap partitions, so we consider that a Linux partition as |
89 | * well. |
90 | */ |
91 | for (slot = 1; slot <= 4; slot++, pt++) { |
92 | if (pt->sys_ind == SOLARIS_X86_PARTITION || |
93 | pt->sys_ind == LINUX_RAID_PARTITION || |
94 | pt->sys_ind == LINUX_DATA_PARTITION || |
95 | pt->sys_ind == LINUX_LVM_PARTITION || |
96 | is_extended_partition(p: pt)) |
97 | return 0; |
98 | } |
99 | d = read_part_sector(state, n: 7, p: §); |
100 | if (d) { |
101 | if (d[0] == '_' && d[1] == 'L' && d[2] == 'V' && d[3] == 'M') |
102 | ret = 1; |
103 | put_dev_sector(p: sect); |
104 | } |
105 | return ret; |
106 | } |
107 | |
108 | static void set_info(struct parsed_partitions *state, int slot, |
109 | u32 disksig) |
110 | { |
111 | struct partition_meta_info *info = &state->parts[slot].info; |
112 | |
113 | snprintf(buf: info->uuid, size: sizeof(info->uuid), fmt: "%08x-%02x" , disksig, |
114 | slot); |
115 | info->volname[0] = 0; |
116 | state->parts[slot].has_info = true; |
117 | } |
118 | |
119 | /* |
120 | * Create devices for each logical partition in an extended partition. |
121 | * The logical partitions form a linked list, with each entry being |
122 | * a partition table with two entries. The first entry |
123 | * is the real data partition (with a start relative to the partition |
124 | * table start). The second is a pointer to the next logical partition |
125 | * (with a start relative to the entire extended partition). |
126 | * We do not create a Linux partition for the partition tables, but |
127 | * only for the actual data partitions. |
128 | */ |
129 | |
130 | static void parse_extended(struct parsed_partitions *state, |
131 | sector_t first_sector, sector_t first_size, |
132 | u32 disksig) |
133 | { |
134 | struct msdos_partition *p; |
135 | Sector sect; |
136 | unsigned char *data; |
137 | sector_t this_sector, this_size; |
138 | sector_t sector_size; |
139 | int loopct = 0; /* number of links followed |
140 | without finding a data partition */ |
141 | int i; |
142 | |
143 | sector_size = queue_logical_block_size(q: state->disk->queue) / 512; |
144 | this_sector = first_sector; |
145 | this_size = first_size; |
146 | |
147 | while (1) { |
148 | if (++loopct > 100) |
149 | return; |
150 | if (state->next == state->limit) |
151 | return; |
152 | data = read_part_sector(state, n: this_sector, p: §); |
153 | if (!data) |
154 | return; |
155 | |
156 | if (!msdos_magic_present(p: data + 510)) |
157 | goto done; |
158 | |
159 | p = (struct msdos_partition *) (data + 0x1be); |
160 | |
161 | /* |
162 | * Usually, the first entry is the real data partition, |
163 | * the 2nd entry is the next extended partition, or empty, |
164 | * and the 3rd and 4th entries are unused. |
165 | * However, DRDOS sometimes has the extended partition as |
166 | * the first entry (when the data partition is empty), |
167 | * and OS/2 seems to use all four entries. |
168 | */ |
169 | |
170 | /* |
171 | * First process the data partition(s) |
172 | */ |
173 | for (i = 0; i < 4; i++, p++) { |
174 | sector_t offs, size, next; |
175 | |
176 | if (!nr_sects(p) || is_extended_partition(p)) |
177 | continue; |
178 | |
179 | /* Check the 3rd and 4th entries - |
180 | these sometimes contain random garbage */ |
181 | offs = start_sect(p)*sector_size; |
182 | size = nr_sects(p)*sector_size; |
183 | next = this_sector + offs; |
184 | if (i >= 2) { |
185 | if (offs + size > this_size) |
186 | continue; |
187 | if (next < first_sector) |
188 | continue; |
189 | if (next + size > first_sector + first_size) |
190 | continue; |
191 | } |
192 | |
193 | put_partition(p: state, n: state->next, from: next, size); |
194 | set_info(state, slot: state->next, disksig); |
195 | if (p->sys_ind == LINUX_RAID_PARTITION) |
196 | state->parts[state->next].flags = ADDPART_FLAG_RAID; |
197 | loopct = 0; |
198 | if (++state->next == state->limit) |
199 | goto done; |
200 | } |
201 | /* |
202 | * Next, process the (first) extended partition, if present. |
203 | * (So far, there seems to be no reason to make |
204 | * parse_extended() recursive and allow a tree |
205 | * of extended partitions.) |
206 | * It should be a link to the next logical partition. |
207 | */ |
208 | p -= 4; |
209 | for (i = 0; i < 4; i++, p++) |
210 | if (nr_sects(p) && is_extended_partition(p)) |
211 | break; |
212 | if (i == 4) |
213 | goto done; /* nothing left to do */ |
214 | |
215 | this_sector = first_sector + start_sect(p) * sector_size; |
216 | this_size = nr_sects(p) * sector_size; |
217 | put_dev_sector(p: sect); |
218 | } |
219 | done: |
220 | put_dev_sector(p: sect); |
221 | } |
222 | |
223 | #define SOLARIS_X86_NUMSLICE 16 |
224 | #define SOLARIS_X86_VTOC_SANE (0x600DDEEEUL) |
225 | |
226 | struct solaris_x86_slice { |
227 | __le16 s_tag; /* ID tag of partition */ |
228 | __le16 s_flag; /* permission flags */ |
229 | __le32 s_start; /* start sector no of partition */ |
230 | __le32 s_size; /* # of blocks in partition */ |
231 | }; |
232 | |
233 | struct solaris_x86_vtoc { |
234 | unsigned int v_bootinfo[3]; /* info needed by mboot */ |
235 | __le32 v_sanity; /* to verify vtoc sanity */ |
236 | __le32 v_version; /* layout version */ |
237 | char v_volume[8]; /* volume name */ |
238 | __le16 v_sectorsz; /* sector size in bytes */ |
239 | __le16 v_nparts; /* number of partitions */ |
240 | unsigned int v_reserved[10]; /* free space */ |
241 | struct solaris_x86_slice |
242 | v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */ |
243 | unsigned int timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp */ |
244 | char v_asciilabel[128]; /* for compatibility */ |
245 | }; |
246 | |
247 | /* james@bpgc.com: Solaris has a nasty indicator: 0x82 which also |
248 | indicates linux swap. Be careful before believing this is Solaris. */ |
249 | |
250 | static void parse_solaris_x86(struct parsed_partitions *state, |
251 | sector_t offset, sector_t size, int origin) |
252 | { |
253 | #ifdef CONFIG_SOLARIS_X86_PARTITION |
254 | Sector sect; |
255 | struct solaris_x86_vtoc *v; |
256 | int i; |
257 | short max_nparts; |
258 | |
259 | v = read_part_sector(state, n: offset + 1, p: §); |
260 | if (!v) |
261 | return; |
262 | if (le32_to_cpu(v->v_sanity) != SOLARIS_X86_VTOC_SANE) { |
263 | put_dev_sector(p: sect); |
264 | return; |
265 | } |
266 | { |
267 | char tmp[1 + BDEVNAME_SIZE + 10 + 11 + 1]; |
268 | |
269 | snprintf(buf: tmp, size: sizeof(tmp), fmt: " %s%d: <solaris:" , state->name, origin); |
270 | strlcat(p: state->pp_buf, q: tmp, PAGE_SIZE); |
271 | } |
272 | if (le32_to_cpu(v->v_version) != 1) { |
273 | char tmp[64]; |
274 | |
275 | snprintf(buf: tmp, size: sizeof(tmp), fmt: " cannot handle version %d vtoc>\n" , |
276 | le32_to_cpu(v->v_version)); |
277 | strlcat(p: state->pp_buf, q: tmp, PAGE_SIZE); |
278 | put_dev_sector(p: sect); |
279 | return; |
280 | } |
281 | /* Ensure we can handle previous case of VTOC with 8 entries gracefully */ |
282 | max_nparts = le16_to_cpu(v->v_nparts) > 8 ? SOLARIS_X86_NUMSLICE : 8; |
283 | for (i = 0; i < max_nparts && state->next < state->limit; i++) { |
284 | struct solaris_x86_slice *s = &v->v_slice[i]; |
285 | char tmp[3 + 10 + 1 + 1]; |
286 | |
287 | if (s->s_size == 0) |
288 | continue; |
289 | snprintf(buf: tmp, size: sizeof(tmp), fmt: " [s%d]" , i); |
290 | strlcat(p: state->pp_buf, q: tmp, PAGE_SIZE); |
291 | /* solaris partitions are relative to current MS-DOS |
292 | * one; must add the offset of the current partition */ |
293 | put_partition(p: state, n: state->next++, |
294 | le32_to_cpu(s->s_start)+offset, |
295 | le32_to_cpu(s->s_size)); |
296 | } |
297 | put_dev_sector(p: sect); |
298 | strlcat(p: state->pp_buf, q: " >\n" , PAGE_SIZE); |
299 | #endif |
300 | } |
301 | |
302 | /* check against BSD src/sys/sys/disklabel.h for consistency */ |
303 | #define BSD_DISKMAGIC (0x82564557UL) /* The disk magic number */ |
304 | #define BSD_MAXPARTITIONS 16 |
305 | #define OPENBSD_MAXPARTITIONS 16 |
306 | #define BSD_FS_UNUSED 0 /* disklabel unused partition entry ID */ |
307 | struct bsd_disklabel { |
308 | __le32 d_magic; /* the magic number */ |
309 | __s16 d_type; /* drive type */ |
310 | __s16 d_subtype; /* controller/d_type specific */ |
311 | char d_typename[16]; /* type name, e.g. "eagle" */ |
312 | char d_packname[16]; /* pack identifier */ |
313 | __u32 d_secsize; /* # of bytes per sector */ |
314 | __u32 d_nsectors; /* # of data sectors per track */ |
315 | __u32 d_ntracks; /* # of tracks per cylinder */ |
316 | __u32 d_ncylinders; /* # of data cylinders per unit */ |
317 | __u32 d_secpercyl; /* # of data sectors per cylinder */ |
318 | __u32 d_secperunit; /* # of data sectors per unit */ |
319 | __u16 d_sparespertrack; /* # of spare sectors per track */ |
320 | __u16 d_sparespercyl; /* # of spare sectors per cylinder */ |
321 | __u32 d_acylinders; /* # of alt. cylinders per unit */ |
322 | __u16 d_rpm; /* rotational speed */ |
323 | __u16 d_interleave; /* hardware sector interleave */ |
324 | __u16 d_trackskew; /* sector 0 skew, per track */ |
325 | __u16 d_cylskew; /* sector 0 skew, per cylinder */ |
326 | __u32 d_headswitch; /* head switch time, usec */ |
327 | __u32 d_trkseek; /* track-to-track seek, usec */ |
328 | __u32 d_flags; /* generic flags */ |
329 | #define NDDATA 5 |
330 | __u32 d_drivedata[NDDATA]; /* drive-type specific information */ |
331 | #define NSPARE 5 |
332 | __u32 d_spare[NSPARE]; /* reserved for future use */ |
333 | __le32 d_magic2; /* the magic number (again) */ |
334 | __le16 d_checksum; /* xor of data incl. partitions */ |
335 | |
336 | /* filesystem and partition information: */ |
337 | __le16 d_npartitions; /* number of partitions in following */ |
338 | __le32 d_bbsize; /* size of boot area at sn0, bytes */ |
339 | __le32 d_sbsize; /* max size of fs superblock, bytes */ |
340 | struct bsd_partition { /* the partition table */ |
341 | __le32 p_size; /* number of sectors in partition */ |
342 | __le32 p_offset; /* starting sector */ |
343 | __le32 p_fsize; /* filesystem basic fragment size */ |
344 | __u8 p_fstype; /* filesystem type, see below */ |
345 | __u8 p_frag; /* filesystem fragments per block */ |
346 | __le16 p_cpg; /* filesystem cylinders per group */ |
347 | } d_partitions[BSD_MAXPARTITIONS]; /* actually may be more */ |
348 | }; |
349 | |
350 | #if defined(CONFIG_BSD_DISKLABEL) |
351 | /* |
352 | * Create devices for BSD partitions listed in a disklabel, under a |
353 | * dos-like partition. See parse_extended() for more information. |
354 | */ |
355 | static void parse_bsd(struct parsed_partitions *state, |
356 | sector_t offset, sector_t size, int origin, char *flavour, |
357 | int max_partitions) |
358 | { |
359 | Sector sect; |
360 | struct bsd_disklabel *l; |
361 | struct bsd_partition *p; |
362 | char tmp[64]; |
363 | |
364 | l = read_part_sector(state, n: offset + 1, p: §); |
365 | if (!l) |
366 | return; |
367 | if (le32_to_cpu(l->d_magic) != BSD_DISKMAGIC) { |
368 | put_dev_sector(p: sect); |
369 | return; |
370 | } |
371 | |
372 | snprintf(buf: tmp, size: sizeof(tmp), fmt: " %s%d: <%s:" , state->name, origin, flavour); |
373 | strlcat(p: state->pp_buf, q: tmp, PAGE_SIZE); |
374 | |
375 | if (le16_to_cpu(l->d_npartitions) < max_partitions) |
376 | max_partitions = le16_to_cpu(l->d_npartitions); |
377 | for (p = l->d_partitions; p - l->d_partitions < max_partitions; p++) { |
378 | sector_t bsd_start, bsd_size; |
379 | |
380 | if (state->next == state->limit) |
381 | break; |
382 | if (p->p_fstype == BSD_FS_UNUSED) |
383 | continue; |
384 | bsd_start = le32_to_cpu(p->p_offset); |
385 | bsd_size = le32_to_cpu(p->p_size); |
386 | /* FreeBSD has relative offset if C partition offset is zero */ |
387 | if (memcmp(p: flavour, q: "bsd\0" , size: 4) == 0 && |
388 | le32_to_cpu(l->d_partitions[2].p_offset) == 0) |
389 | bsd_start += offset; |
390 | if (offset == bsd_start && size == bsd_size) |
391 | /* full parent partition, we have it already */ |
392 | continue; |
393 | if (offset > bsd_start || offset+size < bsd_start+bsd_size) { |
394 | strlcat(p: state->pp_buf, q: "bad subpartition - ignored\n" , PAGE_SIZE); |
395 | continue; |
396 | } |
397 | put_partition(p: state, n: state->next++, from: bsd_start, size: bsd_size); |
398 | } |
399 | put_dev_sector(p: sect); |
400 | if (le16_to_cpu(l->d_npartitions) > max_partitions) { |
401 | snprintf(buf: tmp, size: sizeof(tmp), fmt: " (ignored %d more)" , |
402 | le16_to_cpu(l->d_npartitions) - max_partitions); |
403 | strlcat(p: state->pp_buf, q: tmp, PAGE_SIZE); |
404 | } |
405 | strlcat(p: state->pp_buf, q: " >\n" , PAGE_SIZE); |
406 | } |
407 | #endif |
408 | |
409 | static void parse_freebsd(struct parsed_partitions *state, |
410 | sector_t offset, sector_t size, int origin) |
411 | { |
412 | #ifdef CONFIG_BSD_DISKLABEL |
413 | parse_bsd(state, offset, size, origin, flavour: "bsd" , BSD_MAXPARTITIONS); |
414 | #endif |
415 | } |
416 | |
417 | static void parse_netbsd(struct parsed_partitions *state, |
418 | sector_t offset, sector_t size, int origin) |
419 | { |
420 | #ifdef CONFIG_BSD_DISKLABEL |
421 | parse_bsd(state, offset, size, origin, flavour: "netbsd" , BSD_MAXPARTITIONS); |
422 | #endif |
423 | } |
424 | |
425 | static void parse_openbsd(struct parsed_partitions *state, |
426 | sector_t offset, sector_t size, int origin) |
427 | { |
428 | #ifdef CONFIG_BSD_DISKLABEL |
429 | parse_bsd(state, offset, size, origin, flavour: "openbsd" , |
430 | OPENBSD_MAXPARTITIONS); |
431 | #endif |
432 | } |
433 | |
434 | #define UNIXWARE_DISKMAGIC (0xCA5E600DUL) /* The disk magic number */ |
435 | #define UNIXWARE_DISKMAGIC2 (0x600DDEEEUL) /* The slice table magic nr */ |
436 | #define UNIXWARE_NUMSLICE 16 |
437 | #define UNIXWARE_FS_UNUSED 0 /* Unused slice entry ID */ |
438 | |
439 | struct unixware_slice { |
440 | __le16 s_label; /* label */ |
441 | __le16 s_flags; /* permission flags */ |
442 | __le32 start_sect; /* starting sector */ |
443 | __le32 nr_sects; /* number of sectors in slice */ |
444 | }; |
445 | |
446 | struct unixware_disklabel { |
447 | __le32 d_type; /* drive type */ |
448 | __le32 d_magic; /* the magic number */ |
449 | __le32 d_version; /* version number */ |
450 | char d_serial[12]; /* serial number of the device */ |
451 | __le32 d_ncylinders; /* # of data cylinders per device */ |
452 | __le32 d_ntracks; /* # of tracks per cylinder */ |
453 | __le32 d_nsectors; /* # of data sectors per track */ |
454 | __le32 d_secsize; /* # of bytes per sector */ |
455 | __le32 d_part_start; /* # of first sector of this partition*/ |
456 | __le32 d_unknown1[12]; /* ? */ |
457 | __le32 d_alt_tbl; /* byte offset of alternate table */ |
458 | __le32 d_alt_len; /* byte length of alternate table */ |
459 | __le32 d_phys_cyl; /* # of physical cylinders per device */ |
460 | __le32 d_phys_trk; /* # of physical tracks per cylinder */ |
461 | __le32 d_phys_sec; /* # of physical sectors per track */ |
462 | __le32 d_phys_bytes; /* # of physical bytes per sector */ |
463 | __le32 d_unknown2; /* ? */ |
464 | __le32 d_unknown3; /* ? */ |
465 | __le32 d_pad[8]; /* pad */ |
466 | |
467 | struct unixware_vtoc { |
468 | __le32 v_magic; /* the magic number */ |
469 | __le32 v_version; /* version number */ |
470 | char v_name[8]; /* volume name */ |
471 | __le16 v_nslices; /* # of slices */ |
472 | __le16 v_unknown1; /* ? */ |
473 | __le32 v_reserved[10]; /* reserved */ |
474 | struct unixware_slice |
475 | v_slice[UNIXWARE_NUMSLICE]; /* slice headers */ |
476 | } vtoc; |
477 | }; /* 408 */ |
478 | |
479 | /* |
480 | * Create devices for Unixware partitions listed in a disklabel, under a |
481 | * dos-like partition. See parse_extended() for more information. |
482 | */ |
483 | static void parse_unixware(struct parsed_partitions *state, |
484 | sector_t offset, sector_t size, int origin) |
485 | { |
486 | #ifdef CONFIG_UNIXWARE_DISKLABEL |
487 | Sector sect; |
488 | struct unixware_disklabel *l; |
489 | struct unixware_slice *p; |
490 | |
491 | l = read_part_sector(state, n: offset + 29, p: §); |
492 | if (!l) |
493 | return; |
494 | if (le32_to_cpu(l->d_magic) != UNIXWARE_DISKMAGIC || |
495 | le32_to_cpu(l->vtoc.v_magic) != UNIXWARE_DISKMAGIC2) { |
496 | put_dev_sector(p: sect); |
497 | return; |
498 | } |
499 | { |
500 | char tmp[1 + BDEVNAME_SIZE + 10 + 12 + 1]; |
501 | |
502 | snprintf(buf: tmp, size: sizeof(tmp), fmt: " %s%d: <unixware:" , state->name, origin); |
503 | strlcat(p: state->pp_buf, q: tmp, PAGE_SIZE); |
504 | } |
505 | p = &l->vtoc.v_slice[1]; |
506 | /* I omit the 0th slice as it is the same as whole disk. */ |
507 | while (p - &l->vtoc.v_slice[0] < UNIXWARE_NUMSLICE) { |
508 | if (state->next == state->limit) |
509 | break; |
510 | |
511 | if (p->s_label != UNIXWARE_FS_UNUSED) |
512 | put_partition(p: state, n: state->next++, |
513 | le32_to_cpu(p->start_sect), |
514 | le32_to_cpu(p->nr_sects)); |
515 | p++; |
516 | } |
517 | put_dev_sector(p: sect); |
518 | strlcat(p: state->pp_buf, q: " >\n" , PAGE_SIZE); |
519 | #endif |
520 | } |
521 | |
522 | #define MINIX_NR_SUBPARTITIONS 4 |
523 | |
524 | /* |
525 | * Minix 2.0.0/2.0.2 subpartition support. |
526 | * Anand Krishnamurthy <anandk@wiproge.med.ge.com> |
527 | * Rajeev V. Pillai <rajeevvp@yahoo.com> |
528 | */ |
529 | static void parse_minix(struct parsed_partitions *state, |
530 | sector_t offset, sector_t size, int origin) |
531 | { |
532 | #ifdef CONFIG_MINIX_SUBPARTITION |
533 | Sector sect; |
534 | unsigned char *data; |
535 | struct msdos_partition *p; |
536 | int i; |
537 | |
538 | data = read_part_sector(state, n: offset, p: §); |
539 | if (!data) |
540 | return; |
541 | |
542 | p = (struct msdos_partition *)(data + 0x1be); |
543 | |
544 | /* The first sector of a Minix partition can have either |
545 | * a secondary MBR describing its subpartitions, or |
546 | * the normal boot sector. */ |
547 | if (msdos_magic_present(p: data + 510) && |
548 | p->sys_ind == MINIX_PARTITION) { /* subpartition table present */ |
549 | char tmp[1 + BDEVNAME_SIZE + 10 + 9 + 1]; |
550 | |
551 | snprintf(buf: tmp, size: sizeof(tmp), fmt: " %s%d: <minix:" , state->name, origin); |
552 | strlcat(p: state->pp_buf, q: tmp, PAGE_SIZE); |
553 | for (i = 0; i < MINIX_NR_SUBPARTITIONS; i++, p++) { |
554 | if (state->next == state->limit) |
555 | break; |
556 | /* add each partition in use */ |
557 | if (p->sys_ind == MINIX_PARTITION) |
558 | put_partition(p: state, n: state->next++, |
559 | from: start_sect(p), size: nr_sects(p)); |
560 | } |
561 | strlcat(p: state->pp_buf, q: " >\n" , PAGE_SIZE); |
562 | } |
563 | put_dev_sector(p: sect); |
564 | #endif /* CONFIG_MINIX_SUBPARTITION */ |
565 | } |
566 | |
567 | static struct { |
568 | unsigned char id; |
569 | void (*parse)(struct parsed_partitions *, sector_t, sector_t, int); |
570 | } subtypes[] = { |
571 | {FREEBSD_PARTITION, parse_freebsd}, |
572 | {NETBSD_PARTITION, parse_netbsd}, |
573 | {OPENBSD_PARTITION, parse_openbsd}, |
574 | {MINIX_PARTITION, parse_minix}, |
575 | {UNIXWARE_PARTITION, parse_unixware}, |
576 | {SOLARIS_X86_PARTITION, parse_solaris_x86}, |
577 | {NEW_SOLARIS_X86_PARTITION, parse_solaris_x86}, |
578 | {0, NULL}, |
579 | }; |
580 | |
581 | int msdos_partition(struct parsed_partitions *state) |
582 | { |
583 | sector_t sector_size; |
584 | Sector sect; |
585 | unsigned char *data; |
586 | struct msdos_partition *p; |
587 | struct fat_boot_sector *fb; |
588 | int slot; |
589 | u32 disksig; |
590 | |
591 | sector_size = queue_logical_block_size(q: state->disk->queue) / 512; |
592 | data = read_part_sector(state, n: 0, p: §); |
593 | if (!data) |
594 | return -1; |
595 | |
596 | /* |
597 | * Note order! (some AIX disks, e.g. unbootable kind, |
598 | * have no MSDOS 55aa) |
599 | */ |
600 | if (aix_magic_present(state, p: data)) { |
601 | put_dev_sector(p: sect); |
602 | #ifdef CONFIG_AIX_PARTITION |
603 | return aix_partition(state); |
604 | #else |
605 | strlcat(state->pp_buf, " [AIX]" , PAGE_SIZE); |
606 | return 0; |
607 | #endif |
608 | } |
609 | |
610 | if (!msdos_magic_present(p: data + 510)) { |
611 | put_dev_sector(p: sect); |
612 | return 0; |
613 | } |
614 | |
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 | */ |
621 | p = (struct msdos_partition *) (data + 0x1be); |
622 | for (slot = 1; slot <= 4; slot++, p++) { |
623 | if (p->boot_ind != 0 && p->boot_ind != 0x80) { |
624 | /* |
625 | * Even without a valid boot indicator 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(media: fb->media)) { |
632 | strlcat(p: state->pp_buf, q: "\n" , PAGE_SIZE); |
633 | put_dev_sector(p: sect); |
634 | return 1; |
635 | } else { |
636 | put_dev_sector(p: sect); |
637 | return 0; |
638 | } |
639 | } |
640 | } |
641 | |
642 | #ifdef CONFIG_EFI_PARTITION |
643 | p = (struct msdos_partition *) (data + 0x1be); |
644 | for (slot = 1 ; slot <= 4 ; slot++, p++) { |
645 | /* If this is an EFI GPT disk, msdos should ignore it. */ |
646 | if (p->sys_ind == EFI_PMBR_OSTYPE_EFI_GPT) { |
647 | put_dev_sector(p: sect); |
648 | return 0; |
649 | } |
650 | } |
651 | #endif |
652 | p = (struct msdos_partition *) (data + 0x1be); |
653 | |
654 | disksig = le32_to_cpup(p: (__le32 *)(data + 0x1b8)); |
655 | |
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++) { |
664 | sector_t start = start_sect(p)*sector_size; |
665 | sector_t size = nr_sects(p)*sector_size; |
666 | |
667 | if (!size) |
668 | continue; |
669 | if (is_extended_partition(p)) { |
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; |
677 | |
678 | n = min(size, max(sector_size, n)); |
679 | put_partition(p: state, n: slot, from: start, size: n); |
680 | |
681 | strlcat(p: state->pp_buf, q: " <" , PAGE_SIZE); |
682 | parse_extended(state, first_sector: start, first_size: size, disksig); |
683 | strlcat(p: state->pp_buf, q: " >" , PAGE_SIZE); |
684 | continue; |
685 | } |
686 | put_partition(p: state, n: slot, from: start, size); |
687 | set_info(state, slot, disksig); |
688 | if (p->sys_ind == LINUX_RAID_PARTITION) |
689 | state->parts[slot].flags = ADDPART_FLAG_RAID; |
690 | if (p->sys_ind == DM6_PARTITION) |
691 | strlcat(p: state->pp_buf, q: "[DM]" , PAGE_SIZE); |
692 | if (p->sys_ind == EZD_PARTITION) |
693 | strlcat(p: state->pp_buf, q: "[EZD]" , PAGE_SIZE); |
694 | } |
695 | |
696 | strlcat(p: state->pp_buf, q: "\n" , PAGE_SIZE); |
697 | |
698 | /* second pass - output for each on a separate line */ |
699 | p = (struct msdos_partition *) (0x1be + data); |
700 | for (slot = 1 ; slot <= 4 ; slot++, p++) { |
701 | unsigned char id = p->sys_ind; |
702 | int n; |
703 | |
704 | if (!nr_sects(p)) |
705 | continue; |
706 | |
707 | for (n = 0; subtypes[n].parse && id != subtypes[n].id; n++) |
708 | ; |
709 | |
710 | if (!subtypes[n].parse) |
711 | continue; |
712 | subtypes[n].parse(state, start_sect(p) * sector_size, |
713 | nr_sects(p) * sector_size, slot); |
714 | } |
715 | put_dev_sector(p: sect); |
716 | return 1; |
717 | } |
718 | |