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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, [email protected], 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 <[email protected]>
23 * updated by Marc Espie <[email protected]>
24 *
25 * Unixware slices support by Andrzej Krzysztofowicz <[email protected]>
26 * and Krzysztof G. Baranowski <[email protected]>
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 <linux/unaligned.h>
40
41static inline sector_t nr_sects(struct msdos_partition *p)
42{
43 return (sector_t)get_unaligned_le32(&p->nr_sects);
44}
45
46static inline sector_t start_sect(struct msdos_partition *p)
47{
48 return (sector_t)get_unaligned_le32(&p->start_sect);
49}
50
51static 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
61static inline int
62msdos_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
72static 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(pt))
97 return 0;
98 }
99 d = read_part_sector(state, 7, &sect);
100 if (d) {
101 if (d[0] == '_' && d[1] == 'L' && d[2] == 'V' && d[3] == 'M')
102 ret = 1;
103 put_dev_sector(sect);
104 }
105 return ret;
106}
107
108static 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(info->uuid, sizeof(info->uuid), "%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
130static 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(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, this_sector, &sect);
153 if (!data)
154 return;
155
156 if (!msdos_magic_present(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(state, state->next, next, size);
194 set_info(state, 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(sect);
218 }
219done:
220 put_dev_sector(sect);
221}
222
223#define SOLARIS_X86_NUMSLICE 16
224#define SOLARIS_X86_VTOC_SANE (0x600DDEEEUL)
225
226struct 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
233struct 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/* [email protected]: Solaris has a nasty indicator: 0x82 which also
248 indicates linux swap. Be careful before believing this is Solaris. */
249
250static 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, offset + 1, &sect);
260 if (!v)
261 return;
262 if (le32_to_cpu(v->v_sanity) != SOLARIS_X86_VTOC_SANE) {
263 put_dev_sector(sect);
264 return;
265 }
266 seq_buf_printf(&state->pp_buf, " %s%d: <solaris:", state->name, origin);
267 if (le32_to_cpu(v->v_version) != 1) {
268 seq_buf_printf(&state->pp_buf,
269 " cannot handle version %d vtoc>\n",
270 le32_to_cpu(v->v_version));
271 put_dev_sector(sect);
272 return;
273 }
274 /* Ensure we can handle previous case of VTOC with 8 entries gracefully */
275 max_nparts = le16_to_cpu(v->v_nparts) > 8 ? SOLARIS_X86_NUMSLICE : 8;
276 for (i = 0; i < max_nparts && state->next < state->limit; i++) {
277 struct solaris_x86_slice *s = &v->v_slice[i];
278
279 if (s->s_size == 0)
280 continue;
281 seq_buf_printf(&state->pp_buf, " [s%d]", i);
282 /* solaris partitions are relative to current MS-DOS
283 * one; must add the offset of the current partition */
284 put_partition(state, state->next++,
285 le32_to_cpu(s->s_start)+offset,
286 le32_to_cpu(s->s_size));
287 }
288 put_dev_sector(sect);
289 seq_buf_puts(&state->pp_buf, " >\n");
290#endif
291}
292
293/* check against BSD src/sys/sys/disklabel.h for consistency */
294#define BSD_DISKMAGIC (0x82564557UL) /* The disk magic number */
295#define BSD_MAXPARTITIONS 16
296#define OPENBSD_MAXPARTITIONS 16
297#define BSD_FS_UNUSED 0 /* disklabel unused partition entry ID */
298struct bsd_disklabel {
299 __le32 d_magic; /* the magic number */
300 __s16 d_type; /* drive type */
301 __s16 d_subtype; /* controller/d_type specific */
302 char d_typename[16]; /* type name, e.g. "eagle" */
303 char d_packname[16]; /* pack identifier */
304 __u32 d_secsize; /* # of bytes per sector */
305 __u32 d_nsectors; /* # of data sectors per track */
306 __u32 d_ntracks; /* # of tracks per cylinder */
307 __u32 d_ncylinders; /* # of data cylinders per unit */
308 __u32 d_secpercyl; /* # of data sectors per cylinder */
309 __u32 d_secperunit; /* # of data sectors per unit */
310 __u16 d_sparespertrack; /* # of spare sectors per track */
311 __u16 d_sparespercyl; /* # of spare sectors per cylinder */
312 __u32 d_acylinders; /* # of alt. cylinders per unit */
313 __u16 d_rpm; /* rotational speed */
314 __u16 d_interleave; /* hardware sector interleave */
315 __u16 d_trackskew; /* sector 0 skew, per track */
316 __u16 d_cylskew; /* sector 0 skew, per cylinder */
317 __u32 d_headswitch; /* head switch time, usec */
318 __u32 d_trkseek; /* track-to-track seek, usec */
319 __u32 d_flags; /* generic flags */
320#define NDDATA 5
321 __u32 d_drivedata[NDDATA]; /* drive-type specific information */
322#define NSPARE 5
323 __u32 d_spare[NSPARE]; /* reserved for future use */
324 __le32 d_magic2; /* the magic number (again) */
325 __le16 d_checksum; /* xor of data incl. partitions */
326
327 /* filesystem and partition information: */
328 __le16 d_npartitions; /* number of partitions in following */
329 __le32 d_bbsize; /* size of boot area at sn0, bytes */
330 __le32 d_sbsize; /* max size of fs superblock, bytes */
331 struct bsd_partition { /* the partition table */
332 __le32 p_size; /* number of sectors in partition */
333 __le32 p_offset; /* starting sector */
334 __le32 p_fsize; /* filesystem basic fragment size */
335 __u8 p_fstype; /* filesystem type, see below */
336 __u8 p_frag; /* filesystem fragments per block */
337 __le16 p_cpg; /* filesystem cylinders per group */
338 } d_partitions[BSD_MAXPARTITIONS]; /* actually may be more */
339};
340
341#if defined(CONFIG_BSD_DISKLABEL)
342/*
343 * Create devices for BSD partitions listed in a disklabel, under a
344 * dos-like partition. See parse_extended() for more information.
345 */
346static void parse_bsd(struct parsed_partitions *state,
347 sector_t offset, sector_t size, int origin, char *flavour,
348 int max_partitions)
349{
350 Sector sect;
351 struct bsd_disklabel *l;
352 struct bsd_partition *p;
353
354 l = read_part_sector(state, offset + 1, &sect);
355 if (!l)
356 return;
357 if (le32_to_cpu(l->d_magic) != BSD_DISKMAGIC) {
358 put_dev_sector(sect);
359 return;
360 }
361
362 seq_buf_printf(&state->pp_buf, " %s%d: <%s:", state->name, origin, flavour);
363
364 if (le16_to_cpu(l->d_npartitions) < max_partitions)
365 max_partitions = le16_to_cpu(l->d_npartitions);
366 for (p = l->d_partitions; p - l->d_partitions < max_partitions; p++) {
367 sector_t bsd_start, bsd_size;
368
369 if (state->next == state->limit)
370 break;
371 if (p->p_fstype == BSD_FS_UNUSED)
372 continue;
373 bsd_start = le32_to_cpu(p->p_offset);
374 bsd_size = le32_to_cpu(p->p_size);
375 /* FreeBSD has relative offset if C partition offset is zero */
376 if (memcmp(flavour, "bsd\0", 4) == 0 &&
377 le32_to_cpu(l->d_partitions[2].p_offset) == 0)
378 bsd_start += offset;
379 if (offset == bsd_start && size == bsd_size)
380 /* full parent partition, we have it already */
381 continue;
382 if (offset > bsd_start || offset+size < bsd_start+bsd_size) {
383 seq_buf_puts(&state->pp_buf, "bad subpartition - ignored\n");
384 continue;
385 }
386 put_partition(state, state->next++, bsd_start, bsd_size);
387 }
388 put_dev_sector(sect);
389 if (le16_to_cpu(l->d_npartitions) > max_partitions)
390 seq_buf_printf(&state->pp_buf, " (ignored %d more)",
391 le16_to_cpu(l->d_npartitions) - max_partitions);
392 seq_buf_puts(&state->pp_buf, " >\n");
393}
394#endif
395
396static void parse_freebsd(struct parsed_partitions *state,
397 sector_t offset, sector_t size, int origin)
398{
399#ifdef CONFIG_BSD_DISKLABEL
400 parse_bsd(state, offset, size, origin, "bsd", BSD_MAXPARTITIONS);
401#endif
402}
403
404static void parse_netbsd(struct parsed_partitions *state,
405 sector_t offset, sector_t size, int origin)
406{
407#ifdef CONFIG_BSD_DISKLABEL
408 parse_bsd(state, offset, size, origin, "netbsd", BSD_MAXPARTITIONS);
409#endif
410}
411
412static void parse_openbsd(struct parsed_partitions *state,
413 sector_t offset, sector_t size, int origin)
414{
415#ifdef CONFIG_BSD_DISKLABEL
416 parse_bsd(state, offset, size, origin, "openbsd",
417 OPENBSD_MAXPARTITIONS);
418#endif
419}
420
421#define UNIXWARE_DISKMAGIC (0xCA5E600DUL) /* The disk magic number */
422#define UNIXWARE_DISKMAGIC2 (0x600DDEEEUL) /* The slice table magic nr */
423#define UNIXWARE_NUMSLICE 16
424#define UNIXWARE_FS_UNUSED 0 /* Unused slice entry ID */
425
426struct unixware_slice {
427 __le16 s_label; /* label */
428 __le16 s_flags; /* permission flags */
429 __le32 start_sect; /* starting sector */
430 __le32 nr_sects; /* number of sectors in slice */
431};
432
433struct unixware_disklabel {
434 __le32 d_type; /* drive type */
435 __le32 d_magic; /* the magic number */
436 __le32 d_version; /* version number */
437 char d_serial[12]; /* serial number of the device */
438 __le32 d_ncylinders; /* # of data cylinders per device */
439 __le32 d_ntracks; /* # of tracks per cylinder */
440 __le32 d_nsectors; /* # of data sectors per track */
441 __le32 d_secsize; /* # of bytes per sector */
442 __le32 d_part_start; /* # of first sector of this partition*/
443 __le32 d_unknown1[12]; /* ? */
444 __le32 d_alt_tbl; /* byte offset of alternate table */
445 __le32 d_alt_len; /* byte length of alternate table */
446 __le32 d_phys_cyl; /* # of physical cylinders per device */
447 __le32 d_phys_trk; /* # of physical tracks per cylinder */
448 __le32 d_phys_sec; /* # of physical sectors per track */
449 __le32 d_phys_bytes; /* # of physical bytes per sector */
450 __le32 d_unknown2; /* ? */
451 __le32 d_unknown3; /* ? */
452 __le32 d_pad[8]; /* pad */
453
454 struct unixware_vtoc {
455 __le32 v_magic; /* the magic number */
456 __le32 v_version; /* version number */
457 char v_name[8]; /* volume name */
458 __le16 v_nslices; /* # of slices */
459 __le16 v_unknown1; /* ? */
460 __le32 v_reserved[10]; /* reserved */
461 struct unixware_slice
462 v_slice[UNIXWARE_NUMSLICE]; /* slice headers */
463 } vtoc;
464}; /* 408 */
465
466/*
467 * Create devices for Unixware partitions listed in a disklabel, under a
468 * dos-like partition. See parse_extended() for more information.
469 */
470static void parse_unixware(struct parsed_partitions *state,
471 sector_t offset, sector_t size, int origin)
472{
473#ifdef CONFIG_UNIXWARE_DISKLABEL
474 Sector sect;
475 struct unixware_disklabel *l;
476 struct unixware_slice *p;
477
478 l = read_part_sector(state, offset + 29, &sect);
479 if (!l)
480 return;
481 if (le32_to_cpu(l->d_magic) != UNIXWARE_DISKMAGIC ||
482 le32_to_cpu(l->vtoc.v_magic) != UNIXWARE_DISKMAGIC2) {
483 put_dev_sector(sect);
484 return;
485 }
486 seq_buf_printf(&state->pp_buf, " %s%d: <unixware:", state->name, origin);
487 p = &l->vtoc.v_slice[1];
488 /* I omit the 0th slice as it is the same as whole disk. */
489 while (p - &l->vtoc.v_slice[0] < UNIXWARE_NUMSLICE) {
490 if (state->next == state->limit)
491 break;
492
493 if (p->s_label != UNIXWARE_FS_UNUSED)
494 put_partition(state, state->next++,
495 le32_to_cpu(p->start_sect),
496 le32_to_cpu(p->nr_sects));
497 p++;
498 }
499 put_dev_sector(sect);
500 seq_buf_puts(&state->pp_buf, " >\n");
501#endif
502}
503
504#define MINIX_NR_SUBPARTITIONS 4
505
506/*
507 * Minix 2.0.0/2.0.2 subpartition support.
508 * Anand Krishnamurthy <[email protected]>
509 * Rajeev V. Pillai <[email protected]>
510 */
511static void parse_minix(struct parsed_partitions *state,
512 sector_t offset, sector_t size, int origin)
513{
514#ifdef CONFIG_MINIX_SUBPARTITION
515 Sector sect;
516 unsigned char *data;
517 struct msdos_partition *p;
518 int i;
519
520 data = read_part_sector(state, offset, &sect);
521 if (!data)
522 return;
523
524 p = (struct msdos_partition *)(data + 0x1be);
525
526 /* The first sector of a Minix partition can have either
527 * a secondary MBR describing its subpartitions, or
528 * the normal boot sector. */
529 if (msdos_magic_present(data + 510) &&
530 p->sys_ind == MINIX_PARTITION) { /* subpartition table present */
531 seq_buf_printf(&state->pp_buf, " %s%d: <minix:", state->name, origin);
532 for (i = 0; i < MINIX_NR_SUBPARTITIONS; i++, p++) {
533 if (state->next == state->limit)
534 break;
535 /* add each partition in use */
536 if (p->sys_ind == MINIX_PARTITION)
537 put_partition(state, state->next++,
538 start_sect(p), nr_sects(p));
539 }
540 seq_buf_puts(&state->pp_buf, " >\n");
541 }
542 put_dev_sector(sect);
543#endif /* CONFIG_MINIX_SUBPARTITION */
544}
545
546static struct {
547 unsigned char id;
548 void (*parse)(struct parsed_partitions *, sector_t, sector_t, int);
549} subtypes[] = {
550 {FREEBSD_PARTITION, parse_freebsd},
551 {NETBSD_PARTITION, parse_netbsd},
552 {OPENBSD_PARTITION, parse_openbsd},
553 {MINIX_PARTITION, parse_minix},
554 {UNIXWARE_PARTITION, parse_unixware},
555 {SOLARIS_X86_PARTITION, parse_solaris_x86},
556 {NEW_SOLARIS_X86_PARTITION, parse_solaris_x86},
557 {0, NULL},
558};
559
560int msdos_partition(struct parsed_partitions *state)
561{
562 sector_t sector_size;
563 Sector sect;
564 unsigned char *data;
565 struct msdos_partition *p;
566 struct fat_boot_sector *fb;
567 int slot;
568 u32 disksig;
569
570 sector_size = queue_logical_block_size(state->disk->queue) / 512;
571 data = read_part_sector(state, 0, &sect);
572 if (!data)
573 return -1;
574
575 /*
576 * Note order! (some AIX disks, e.g. unbootable kind,
577 * have no MSDOS 55aa)
578 */
579 if (aix_magic_present(state, data)) {
580 put_dev_sector(sect);
581#ifdef CONFIG_AIX_PARTITION
582 return aix_partition(state);
583#else
584 seq_buf_puts(&state->pp_buf, " [AIX]");
585 return 0;
586#endif
587 }
588
589 if (!msdos_magic_present(data + 510)) {
590 put_dev_sector(sect);
591 return 0;
592 }
593
594 /*
595 * Now that the 55aa signature is present, this is probably
596 * either the boot sector of a FAT filesystem or a DOS-type
597 * partition table. Reject this in case the boot indicator
598 * is not 0 or 0x80.
599 */
600 p = (struct msdos_partition *) (data + 0x1be);
601 for (slot = 1; slot <= 4; slot++, p++) {
602 if (p->boot_ind != 0 && p->boot_ind != 0x80) {
603 /*
604 * Even without a valid boot indicator value
605 * its still possible this is valid FAT filesystem
606 * without a partition table.
607 */
608 fb = (struct fat_boot_sector *) data;
609 if (slot == 1 && fb->reserved && fb->fats
610 && fat_valid_media(fb->media)) {
611 seq_buf_puts(&state->pp_buf, "\n");
612 put_dev_sector(sect);
613 return 1;
614 } else {
615 put_dev_sector(sect);
616 return 0;
617 }
618 }
619 }
620
621#ifdef CONFIG_EFI_PARTITION
622 p = (struct msdos_partition *) (data + 0x1be);
623 for (slot = 1 ; slot <= 4 ; slot++, p++) {
624 /* If this is an EFI GPT disk, msdos should ignore it. */
625 if (p->sys_ind == EFI_PMBR_OSTYPE_EFI_GPT) {
626 put_dev_sector(sect);
627 return 0;
628 }
629 }
630#endif
631 p = (struct msdos_partition *) (data + 0x1be);
632
633 disksig = le32_to_cpup((__le32 *)(data + 0x1b8));
634
635 /*
636 * Look for partitions in two passes:
637 * First find the primary and DOS-type extended partitions.
638 * On the second pass look inside *BSD, Unixware and Solaris partitions.
639 */
640
641 state->next = 5;
642 for (slot = 1 ; slot <= 4 ; slot++, p++) {
643 sector_t start = start_sect(p)*sector_size;
644 sector_t size = nr_sects(p)*sector_size;
645
646 if (!size)
647 continue;
648 if (is_extended_partition(p)) {
649 /*
650 * prevent someone doing mkfs or mkswap on an
651 * extended partition, but leave room for LILO
652 * FIXME: this uses one logical sector for > 512b
653 * sector, although it may not be enough/proper.
654 */
655 sector_t n = 2;
656
657 n = min(size, max(sector_size, n));
658 put_partition(state, slot, start, n);
659
660 seq_buf_puts(&state->pp_buf, " <");
661 parse_extended(state, start, size, disksig);
662 seq_buf_puts(&state->pp_buf, " >");
663 continue;
664 }
665 put_partition(state, slot, start, size);
666 set_info(state, slot, disksig);
667 if (p->sys_ind == LINUX_RAID_PARTITION)
668 state->parts[slot].flags = ADDPART_FLAG_RAID;
669 if (p->sys_ind == DM6_PARTITION)
670 seq_buf_puts(&state->pp_buf, "[DM]");
671 if (p->sys_ind == EZD_PARTITION)
672 seq_buf_puts(&state->pp_buf, "[EZD]");
673 }
674
675 seq_buf_puts(&state->pp_buf, "\n");
676
677 /* second pass - output for each on a separate line */
678 p = (struct msdos_partition *) (0x1be + data);
679 for (slot = 1 ; slot <= 4 ; slot++, p++) {
680 unsigned char id = p->sys_ind;
681 int n;
682
683 if (!nr_sects(p))
684 continue;
685
686 for (n = 0; subtypes[n].parse && id != subtypes[n].id; n++)
687 ;
688
689 if (!subtypes[n].parse)
690 continue;
691 subtypes[n].parse(state, start_sect(p) * sector_size,
692 nr_sects(p) * sector_size, slot);
693 }
694 put_dev_sector(sect);
695 return 1;
696}