Line data Source code
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 : #define SYS_IND(p) get_unaligned(&p->sys_ind)
42 :
43 8 : static inline sector_t nr_sects(struct msdos_partition *p)
44 : {
45 8 : return (sector_t)get_unaligned_le32(&p->nr_sects);
46 : }
47 :
48 4 : static inline sector_t start_sect(struct msdos_partition *p)
49 : {
50 4 : return (sector_t)get_unaligned_le32(&p->start_sect);
51 : }
52 :
53 1 : static inline int is_extended_partition(struct msdos_partition *p)
54 : {
55 1 : return (SYS_IND(p) == DOS_EXTENDED_PARTITION ||
56 1 : 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 1 : msdos_magic_present(unsigned char *p)
65 : {
66 1 : return (p[0] == MSDOS_LABEL_MAGIC1 && p[1] == MSDOS_LABEL_MAGIC2);
67 : }
68 :
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
74 1 : static int aix_magic_present(struct parsed_partitions *state, unsigned char *p)
75 : {
76 1 : struct msdos_partition *pt = (struct msdos_partition *) (p + 0x1be);
77 1 : Sector sect;
78 1 : unsigned char *d;
79 1 : int slot, ret = 0;
80 :
81 1 : if (!(p[0] == AIX_LABEL_MAGIC1 &&
82 0 : p[1] == AIX_LABEL_MAGIC2 &&
83 0 : p[2] == AIX_LABEL_MAGIC3 &&
84 0 : p[3] == AIX_LABEL_MAGIC4))
85 : return 0;
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 : */
93 0 : for (slot = 1; slot <= 4; slot++, pt++) {
94 0 : if (pt->sys_ind == SOLARIS_X86_PARTITION ||
95 0 : pt->sys_ind == LINUX_RAID_PARTITION ||
96 0 : pt->sys_ind == LINUX_DATA_PARTITION ||
97 : pt->sys_ind == LINUX_LVM_PARTITION ||
98 0 : is_extended_partition(pt))
99 : return 0;
100 : }
101 0 : d = read_part_sector(state, 7, §);
102 0 : if (d) {
103 0 : if (d[0] == '_' && d[1] == 'L' && d[2] == 'V' && d[3] == 'M')
104 0 : ret = 1;
105 0 : put_dev_sector(sect);
106 : }
107 : return ret;
108 : }
109 :
110 1 : static void set_info(struct parsed_partitions *state, int slot,
111 : u32 disksig)
112 : {
113 1 : struct partition_meta_info *info = &state->parts[slot].info;
114 :
115 1 : snprintf(info->uuid, sizeof(info->uuid), "%08x-%02x", disksig,
116 : slot);
117 1 : info->volname[0] = 0;
118 1 : state->parts[slot].has_info = true;
119 1 : }
120 :
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 :
132 0 : static void parse_extended(struct parsed_partitions *state,
133 : sector_t first_sector, sector_t first_size,
134 : u32 disksig)
135 : {
136 0 : struct msdos_partition *p;
137 0 : Sector sect;
138 0 : unsigned char *data;
139 0 : sector_t this_sector, this_size;
140 0 : sector_t sector_size = bdev_logical_block_size(state->bdev) / 512;
141 0 : int loopct = 0; /* number of links followed
142 : without finding a data partition */
143 0 : int i;
144 :
145 0 : this_sector = first_sector;
146 0 : this_size = first_size;
147 :
148 0 : while (1) {
149 0 : if (++loopct > 100)
150 0 : return;
151 0 : if (state->next == state->limit)
152 : return;
153 0 : data = read_part_sector(state, this_sector, §);
154 0 : if (!data)
155 : return;
156 :
157 0 : if (!msdos_magic_present(data + 510))
158 0 : goto done;
159 :
160 0 : p = (struct msdos_partition *) (data + 0x1be);
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 :
171 : /*
172 : * First process the data partition(s)
173 : */
174 0 : for (i = 0; i < 4; i++, p++) {
175 0 : sector_t offs, size, next;
176 :
177 0 : if (!nr_sects(p) || is_extended_partition(p))
178 0 : continue;
179 :
180 : /* Check the 3rd and 4th entries -
181 : these sometimes contain random garbage */
182 0 : offs = start_sect(p)*sector_size;
183 0 : size = nr_sects(p)*sector_size;
184 0 : next = this_sector + offs;
185 0 : if (i >= 2) {
186 0 : if (offs + size > this_size)
187 0 : continue;
188 0 : if (next < first_sector)
189 0 : continue;
190 0 : if (next + size > first_sector + first_size)
191 0 : continue;
192 : }
193 :
194 0 : put_partition(state, state->next, next, size);
195 0 : set_info(state, state->next, disksig);
196 0 : if (SYS_IND(p) == LINUX_RAID_PARTITION)
197 0 : state->parts[state->next].flags = ADDPART_FLAG_RAID;
198 0 : loopct = 0;
199 0 : if (++state->next == state->limit)
200 0 : 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 0 : p -= 4;
210 0 : for (i = 0; i < 4; i++, p++)
211 0 : if (nr_sects(p) && is_extended_partition(p))
212 : break;
213 0 : if (i == 4)
214 0 : goto done; /* nothing left to do */
215 :
216 0 : this_sector = first_sector + start_sect(p) * sector_size;
217 0 : this_size = nr_sects(p) * sector_size;
218 0 : put_dev_sector(sect);
219 : }
220 0 : done:
221 0 : put_dev_sector(sect);
222 : }
223 :
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 :
248 : /* james@bpgc.com: Solaris has a nasty indicator: 0x82 which also
249 : indicates linux swap. Be careful before believing this is Solaris. */
250 :
251 0 : static void parse_solaris_x86(struct parsed_partitions *state,
252 : sector_t offset, sector_t size, int origin)
253 : {
254 : #ifdef CONFIG_SOLARIS_X86_PARTITION
255 : Sector sect;
256 : struct solaris_x86_vtoc *v;
257 : int i;
258 : short max_nparts;
259 :
260 : v = read_part_sector(state, offset + 1, §);
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 : }
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 : }
273 : if (le32_to_cpu(v->v_version) != 1) {
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);
279 : put_dev_sector(sect);
280 : return;
281 : }
282 : /* Ensure we can handle previous case of VTOC with 8 entries gracefully */
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++) {
285 : struct solaris_x86_slice *s = &v->v_slice[i];
286 : char tmp[3 + 10 + 1 + 1];
287 :
288 : if (s->s_size == 0)
289 : continue;
290 : snprintf(tmp, sizeof(tmp), " [s%d]", i);
291 : strlcat(state->pp_buf, tmp, PAGE_SIZE);
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);
299 : strlcat(state->pp_buf, " >\n", PAGE_SIZE);
300 : #endif
301 0 : }
302 :
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 :
351 : #if defined(CONFIG_BSD_DISKLABEL)
352 : /*
353 : * Create devices for BSD partitions listed in a disklabel, under a
354 : * dos-like partition. See parse_extended() for more information.
355 : */
356 : static void parse_bsd(struct parsed_partitions *state,
357 : sector_t offset, sector_t size, int origin, char *flavour,
358 : int max_partitions)
359 : {
360 : Sector sect;
361 : struct bsd_disklabel *l;
362 : struct bsd_partition *p;
363 : char tmp[64];
364 :
365 : l = read_part_sector(state, offset + 1, §);
366 : if (!l)
367 : return;
368 : if (le32_to_cpu(l->d_magic) != BSD_DISKMAGIC) {
369 : put_dev_sector(sect);
370 : return;
371 : }
372 :
373 : snprintf(tmp, sizeof(tmp), " %s%d: <%s:", state->name, origin, flavour);
374 : strlcat(state->pp_buf, tmp, PAGE_SIZE);
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++) {
379 : sector_t bsd_start, bsd_size;
380 :
381 : if (state->next == state->limit)
382 : break;
383 : if (p->p_fstype == BSD_FS_UNUSED)
384 : continue;
385 : bsd_start = le32_to_cpu(p->p_offset);
386 : bsd_size = le32_to_cpu(p->p_size);
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)
390 : bsd_start += offset;
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) {
395 : strlcat(state->pp_buf, "bad subpartition - ignored\n", PAGE_SIZE);
396 : continue;
397 : }
398 : put_partition(state, state->next++, bsd_start, bsd_size);
399 : }
400 : put_dev_sector(sect);
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);
407 : }
408 : #endif
409 :
410 0 : static void parse_freebsd(struct parsed_partitions *state,
411 : sector_t offset, sector_t size, int origin)
412 : {
413 : #ifdef CONFIG_BSD_DISKLABEL
414 : parse_bsd(state, offset, size, origin, "bsd", BSD_MAXPARTITIONS);
415 : #endif
416 0 : }
417 :
418 0 : static void parse_netbsd(struct parsed_partitions *state,
419 : sector_t offset, sector_t size, int origin)
420 : {
421 : #ifdef CONFIG_BSD_DISKLABEL
422 : parse_bsd(state, offset, size, origin, "netbsd", BSD_MAXPARTITIONS);
423 : #endif
424 0 : }
425 :
426 0 : static void parse_openbsd(struct parsed_partitions *state,
427 : sector_t offset, sector_t size, int origin)
428 : {
429 : #ifdef CONFIG_BSD_DISKLABEL
430 : parse_bsd(state, offset, size, origin, "openbsd",
431 : OPENBSD_MAXPARTITIONS);
432 : #endif
433 0 : }
434 :
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 :
480 : /*
481 : * Create devices for Unixware partitions listed in a disklabel, under a
482 : * dos-like partition. See parse_extended() for more information.
483 : */
484 0 : static void parse_unixware(struct parsed_partitions *state,
485 : sector_t offset, sector_t size, int origin)
486 : {
487 : #ifdef CONFIG_UNIXWARE_DISKLABEL
488 : Sector sect;
489 : struct unixware_disklabel *l;
490 : struct unixware_slice *p;
491 :
492 : l = read_part_sector(state, offset + 29, §);
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 : }
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 : }
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++,
514 : le32_to_cpu(p->start_sect),
515 : le32_to_cpu(p->nr_sects));
516 : p++;
517 : }
518 : put_dev_sector(sect);
519 : strlcat(state->pp_buf, " >\n", PAGE_SIZE);
520 : #endif
521 0 : }
522 :
523 : #define MINIX_NR_SUBPARTITIONS 4
524 :
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 : */
530 0 : static void parse_minix(struct parsed_partitions *state,
531 : sector_t offset, sector_t size, int origin)
532 : {
533 : #ifdef CONFIG_MINIX_SUBPARTITION
534 : Sector sect;
535 : unsigned char *data;
536 : struct msdos_partition *p;
537 : int i;
538 :
539 : data = read_part_sector(state, offset, §);
540 : if (!data)
541 : return;
542 :
543 : p = (struct msdos_partition *)(data + 0x1be);
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. */
548 : if (msdos_magic_present(data + 510) &&
549 : SYS_IND(p) == MINIX_PARTITION) { /* subpartition table present */
550 : char tmp[1 + BDEVNAME_SIZE + 10 + 9 + 1];
551 :
552 : snprintf(tmp, sizeof(tmp), " %s%d: <minix:", state->name, origin);
553 : strlcat(state->pp_buf, tmp, PAGE_SIZE);
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++,
560 : start_sect(p), nr_sects(p));
561 : }
562 : strlcat(state->pp_buf, " >\n", PAGE_SIZE);
563 : }
564 : put_dev_sector(sect);
565 : #endif /* CONFIG_MINIX_SUBPARTITION */
566 0 : }
567 :
568 : static struct {
569 : unsigned char id;
570 : void (*parse)(struct parsed_partitions *, sector_t, sector_t, int);
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 : };
581 :
582 1 : int msdos_partition(struct parsed_partitions *state)
583 : {
584 1 : sector_t sector_size = bdev_logical_block_size(state->bdev) / 512;
585 1 : Sector sect;
586 1 : unsigned char *data;
587 1 : struct msdos_partition *p;
588 1 : struct fat_boot_sector *fb;
589 1 : int slot;
590 1 : u32 disksig;
591 :
592 1 : data = read_part_sector(state, 0, §);
593 1 : if (!data)
594 : return -1;
595 :
596 : /*
597 : * Note order! (some AIX disks, e.g. unbootable kind,
598 : * have no MSDOS 55aa)
599 : */
600 1 : if (aix_magic_present(state, data)) {
601 0 : put_dev_sector(sect);
602 : #ifdef CONFIG_AIX_PARTITION
603 : return aix_partition(state);
604 : #else
605 0 : strlcat(state->pp_buf, " [AIX]", PAGE_SIZE);
606 0 : return 0;
607 : #endif
608 : }
609 :
610 1 : if (!msdos_magic_present(data + 510)) {
611 0 : put_dev_sector(sect);
612 0 : 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 1 : p = (struct msdos_partition *) (data + 0x1be);
622 5 : for (slot = 1; slot <= 4; slot++, p++) {
623 4 : if (p->boot_ind != 0 && p->boot_ind != 0x80) {
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 0 : fb = (struct fat_boot_sector *) data;
630 0 : if (slot == 1 && fb->reserved && fb->fats
631 0 : && fat_valid_media(fb->media)) {
632 0 : strlcat(state->pp_buf, "\n", PAGE_SIZE);
633 0 : put_dev_sector(sect);
634 0 : return 1;
635 : } else {
636 0 : put_dev_sector(sect);
637 0 : 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 (SYS_IND(p) == EFI_PMBR_OSTYPE_EFI_GPT) {
647 : put_dev_sector(sect);
648 : return 0;
649 : }
650 : }
651 : #endif
652 1 : p = (struct msdos_partition *) (data + 0x1be);
653 :
654 1 : disksig = le32_to_cpup((__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 1 : state->next = 5;
663 5 : for (slot = 1 ; slot <= 4 ; slot++, p++) {
664 4 : sector_t start = start_sect(p)*sector_size;
665 4 : sector_t size = nr_sects(p)*sector_size;
666 :
667 4 : if (!size)
668 3 : continue;
669 1 : 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 0 : sector_t n = 2;
677 :
678 0 : n = min(size, max(sector_size, n));
679 0 : put_partition(state, slot, start, n);
680 :
681 0 : strlcat(state->pp_buf, " <", PAGE_SIZE);
682 0 : parse_extended(state, start, size, disksig);
683 0 : strlcat(state->pp_buf, " >", PAGE_SIZE);
684 0 : continue;
685 : }
686 1 : put_partition(state, slot, start, size);
687 1 : set_info(state, slot, disksig);
688 1 : if (SYS_IND(p) == LINUX_RAID_PARTITION)
689 0 : state->parts[slot].flags = ADDPART_FLAG_RAID;
690 1 : if (SYS_IND(p) == DM6_PARTITION)
691 0 : strlcat(state->pp_buf, "[DM]", PAGE_SIZE);
692 1 : if (SYS_IND(p) == EZD_PARTITION)
693 0 : strlcat(state->pp_buf, "[EZD]", PAGE_SIZE);
694 : }
695 :
696 1 : strlcat(state->pp_buf, "\n", PAGE_SIZE);
697 :
698 : /* second pass - output for each on a separate line */
699 1 : p = (struct msdos_partition *) (0x1be + data);
700 6 : for (slot = 1 ; slot <= 4 ; slot++, p++) {
701 4 : unsigned char id = SYS_IND(p);
702 4 : int n;
703 :
704 4 : if (!nr_sects(p))
705 3 : continue;
706 :
707 8 : for (n = 0; subtypes[n].parse && id != subtypes[n].id; n++)
708 7 : ;
709 :
710 1 : if (!subtypes[n].parse)
711 1 : continue;
712 0 : subtypes[n].parse(state, start_sect(p) * sector_size,
713 0 : nr_sects(p) * sector_size, slot);
714 : }
715 1 : put_dev_sector(sect);
716 1 : return 1;
717 : }
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