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Linux/block/partitions/msdos.c

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  1 /*
  2  *  fs/partitions/msdos.c
  3  *
  4  *  Code extracted from drivers/block/genhd.c
  5  *  Copyright (C) 1991-1998  Linus Torvalds
  6  *
  7  *  Thanks to Branko Lankester, lankeste@fwi.uva.nl, who found a bug
  8  *  in the early extended-partition checks and added DM partitions
  9  *
 10  *  Support for DiskManager v6.0x added by Mark Lord,
 11  *  with information provided by OnTrack.  This now works for linux fdisk
 12  *  and LILO, as well as loadlin and bootln.  Note that disks other than
 13  *  /dev/hda *must* have a "DOS" type 0x51 partition in the first slot (hda1).
 14  *
 15  *  More flexible handling of extended partitions - aeb, 950831
 16  *
 17  *  Check partition table on IDE disks for common CHS translations
 18  *
 19  *  Re-organised Feb 1998 Russell King
 20  */
 21 #include <linux/msdos_fs.h>
 22 
 23 #include "check.h"
 24 #include "msdos.h"
 25 #include "efi.h"
 26 #include "aix.h"
 27 
 28 /*
 29  * Many architectures don't like unaligned accesses, while
 30  * the nr_sects and start_sect partition table entries are
 31  * at a 2 (mod 4) address.
 32  */
 33 #include <asm/unaligned.h>
 34 
 35 #define SYS_IND(p)      get_unaligned(&p->sys_ind)
 36 
 37 static inline sector_t nr_sects(struct partition *p)
 38 {
 39         return (sector_t)get_unaligned_le32(&p->nr_sects);
 40 }
 41 
 42 static inline sector_t start_sect(struct partition *p)
 43 {
 44         return (sector_t)get_unaligned_le32(&p->start_sect);
 45 }
 46 
 47 static inline int is_extended_partition(struct partition *p)
 48 {
 49         return (SYS_IND(p) == DOS_EXTENDED_PARTITION ||
 50                 SYS_IND(p) == WIN98_EXTENDED_PARTITION ||
 51                 SYS_IND(p) == LINUX_EXTENDED_PARTITION);
 52 }
 53 
 54 #define MSDOS_LABEL_MAGIC1      0x55
 55 #define MSDOS_LABEL_MAGIC2      0xAA
 56 
 57 static inline int
 58 msdos_magic_present(unsigned char *p)
 59 {
 60         return (p[0] == MSDOS_LABEL_MAGIC1 && p[1] == MSDOS_LABEL_MAGIC2);
 61 }
 62 
 63 /* Value is EBCDIC 'IBMA' */
 64 #define AIX_LABEL_MAGIC1        0xC9
 65 #define AIX_LABEL_MAGIC2        0xC2
 66 #define AIX_LABEL_MAGIC3        0xD4
 67 #define AIX_LABEL_MAGIC4        0xC1
 68 static int aix_magic_present(struct parsed_partitions *state, unsigned char *p)
 69 {
 70         struct partition *pt = (struct partition *) (p + 0x1be);
 71         Sector sect;
 72         unsigned char *d;
 73         int slot, ret = 0;
 74 
 75         if (!(p[0] == AIX_LABEL_MAGIC1 &&
 76                 p[1] == AIX_LABEL_MAGIC2 &&
 77                 p[2] == AIX_LABEL_MAGIC3 &&
 78                 p[3] == AIX_LABEL_MAGIC4))
 79                 return 0;
 80         /* Assume the partition table is valid if Linux partitions exists */
 81         for (slot = 1; slot <= 4; slot++, pt++) {
 82                 if (pt->sys_ind == LINUX_SWAP_PARTITION ||
 83                         pt->sys_ind == LINUX_RAID_PARTITION ||
 84                         pt->sys_ind == LINUX_DATA_PARTITION ||
 85                         pt->sys_ind == LINUX_LVM_PARTITION ||
 86                         is_extended_partition(pt))
 87                         return 0;
 88         }
 89         d = read_part_sector(state, 7, &sect);
 90         if (d) {
 91                 if (d[0] == '_' && d[1] == 'L' && d[2] == 'V' && d[3] == 'M')
 92                         ret = 1;
 93                 put_dev_sector(sect);
 94         }
 95         return ret;
 96 }
 97 
 98 static void set_info(struct parsed_partitions *state, int slot,
 99                      u32 disksig)
100 {
101         struct partition_meta_info *info = &state->parts[slot].info;
102 
103         snprintf(info->uuid, sizeof(info->uuid), "%08x-%02x", disksig,
104                  slot);
105         info->volname[0] = 0;
106         state->parts[slot].has_info = true;
107 }
108 
109 /*
110  * Create devices for each logical partition in an extended partition.
111  * The logical partitions form a linked list, with each entry being
112  * a partition table with two entries.  The first entry
113  * is the real data partition (with a start relative to the partition
114  * table start).  The second is a pointer to the next logical partition
115  * (with a start relative to the entire extended partition).
116  * We do not create a Linux partition for the partition tables, but
117  * only for the actual data partitions.
118  */
119 
120 static void parse_extended(struct parsed_partitions *state,
121                            sector_t first_sector, sector_t first_size,
122                            u32 disksig)
123 {
124         struct partition *p;
125         Sector sect;
126         unsigned char *data;
127         sector_t this_sector, this_size;
128         sector_t sector_size = bdev_logical_block_size(state->bdev) / 512;
129         int loopct = 0;         /* number of links followed
130                                    without finding a data partition */
131         int i;
132 
133         this_sector = first_sector;
134         this_size = first_size;
135 
136         while (1) {
137                 if (++loopct > 100)
138                         return;
139                 if (state->next == state->limit)
140                         return;
141                 data = read_part_sector(state, this_sector, &sect);
142                 if (!data)
143                         return;
144 
145                 if (!msdos_magic_present(data + 510))
146                         goto done;
147 
148                 p = (struct partition *) (data + 0x1be);
149 
150                 /*
151                  * Usually, the first entry is the real data partition,
152                  * the 2nd entry is the next extended partition, or empty,
153                  * and the 3rd and 4th entries are unused.
154                  * However, DRDOS sometimes has the extended partition as
155                  * the first entry (when the data partition is empty),
156                  * and OS/2 seems to use all four entries.
157                  */
158 
159                 /*
160                  * First process the data partition(s)
161                  */
162                 for (i=0; i<4; i++, p++) {
163                         sector_t offs, size, next;
164                         if (!nr_sects(p) || is_extended_partition(p))
165                                 continue;
166 
167                         /* Check the 3rd and 4th entries -
168                            these sometimes contain random garbage */
169                         offs = start_sect(p)*sector_size;
170                         size = nr_sects(p)*sector_size;
171                         next = this_sector + offs;
172                         if (i >= 2) {
173                                 if (offs + size > this_size)
174                                         continue;
175                                 if (next < first_sector)
176                                         continue;
177                                 if (next + size > first_sector + first_size)
178                                         continue;
179                         }
180 
181                         put_partition(state, state->next, next, size);
182                         set_info(state, state->next, disksig);
183                         if (SYS_IND(p) == LINUX_RAID_PARTITION)
184                                 state->parts[state->next].flags = ADDPART_FLAG_RAID;
185                         loopct = 0;
186                         if (++state->next == state->limit)
187                                 goto done;
188                 }
189                 /*
190                  * Next, process the (first) extended partition, if present.
191                  * (So far, there seems to be no reason to make
192                  *  parse_extended()  recursive and allow a tree
193                  *  of extended partitions.)
194                  * It should be a link to the next logical partition.
195                  */
196                 p -= 4;
197                 for (i=0; i<4; i++, p++)
198                         if (nr_sects(p) && is_extended_partition(p))
199                                 break;
200                 if (i == 4)
201                         goto done;       /* nothing left to do */
202 
203                 this_sector = first_sector + start_sect(p) * sector_size;
204                 this_size = nr_sects(p) * sector_size;
205                 put_dev_sector(sect);
206         }
207 done:
208         put_dev_sector(sect);
209 }
210 
211 /* james@bpgc.com: Solaris has a nasty indicator: 0x82 which also
212    indicates linux swap.  Be careful before believing this is Solaris. */
213 
214 static void parse_solaris_x86(struct parsed_partitions *state,
215                               sector_t offset, sector_t size, int origin)
216 {
217 #ifdef CONFIG_SOLARIS_X86_PARTITION
218         Sector sect;
219         struct solaris_x86_vtoc *v;
220         int i;
221         short max_nparts;
222 
223         v = read_part_sector(state, offset + 1, &sect);
224         if (!v)
225                 return;
226         if (le32_to_cpu(v->v_sanity) != SOLARIS_X86_VTOC_SANE) {
227                 put_dev_sector(sect);
228                 return;
229         }
230         {
231                 char tmp[1 + BDEVNAME_SIZE + 10 + 11 + 1];
232 
233                 snprintf(tmp, sizeof(tmp), " %s%d: <solaris:", state->name, origin);
234                 strlcat(state->pp_buf, tmp, PAGE_SIZE);
235         }
236         if (le32_to_cpu(v->v_version) != 1) {
237                 char tmp[64];
238 
239                 snprintf(tmp, sizeof(tmp), "  cannot handle version %d vtoc>\n",
240                          le32_to_cpu(v->v_version));
241                 strlcat(state->pp_buf, tmp, PAGE_SIZE);
242                 put_dev_sector(sect);
243                 return;
244         }
245         /* Ensure we can handle previous case of VTOC with 8 entries gracefully */
246         max_nparts = le16_to_cpu (v->v_nparts) > 8 ? SOLARIS_X86_NUMSLICE : 8;
247         for (i=0; i<max_nparts && state->next<state->limit; i++) {
248                 struct solaris_x86_slice *s = &v->v_slice[i];
249                 char tmp[3 + 10 + 1 + 1];
250 
251                 if (s->s_size == 0)
252                         continue;
253                 snprintf(tmp, sizeof(tmp), " [s%d]", i);
254                 strlcat(state->pp_buf, tmp, PAGE_SIZE);
255                 /* solaris partitions are relative to current MS-DOS
256                  * one; must add the offset of the current partition */
257                 put_partition(state, state->next++,
258                                  le32_to_cpu(s->s_start)+offset,
259                                  le32_to_cpu(s->s_size));
260         }
261         put_dev_sector(sect);
262         strlcat(state->pp_buf, " >\n", PAGE_SIZE);
263 #endif
264 }
265 
266 #if defined(CONFIG_BSD_DISKLABEL)
267 /*
268  * Create devices for BSD partitions listed in a disklabel, under a
269  * dos-like partition. See parse_extended() for more information.
270  */
271 static void parse_bsd(struct parsed_partitions *state,
272                       sector_t offset, sector_t size, int origin, char *flavour,
273                       int max_partitions)
274 {
275         Sector sect;
276         struct bsd_disklabel *l;
277         struct bsd_partition *p;
278         char tmp[64];
279 
280         l = read_part_sector(state, offset + 1, &sect);
281         if (!l)
282                 return;
283         if (le32_to_cpu(l->d_magic) != BSD_DISKMAGIC) {
284                 put_dev_sector(sect);
285                 return;
286         }
287 
288         snprintf(tmp, sizeof(tmp), " %s%d: <%s:", state->name, origin, flavour);
289         strlcat(state->pp_buf, tmp, PAGE_SIZE);
290 
291         if (le16_to_cpu(l->d_npartitions) < max_partitions)
292                 max_partitions = le16_to_cpu(l->d_npartitions);
293         for (p = l->d_partitions; p - l->d_partitions < max_partitions; p++) {
294                 sector_t bsd_start, bsd_size;
295 
296                 if (state->next == state->limit)
297                         break;
298                 if (p->p_fstype == BSD_FS_UNUSED)
299                         continue;
300                 bsd_start = le32_to_cpu(p->p_offset);
301                 bsd_size = le32_to_cpu(p->p_size);
302                 if (offset == bsd_start && size == bsd_size)
303                         /* full parent partition, we have it already */
304                         continue;
305                 if (offset > bsd_start || offset+size < bsd_start+bsd_size) {
306                         strlcat(state->pp_buf, "bad subpartition - ignored\n", PAGE_SIZE);
307                         continue;
308                 }
309                 put_partition(state, state->next++, bsd_start, bsd_size);
310         }
311         put_dev_sector(sect);
312         if (le16_to_cpu(l->d_npartitions) > max_partitions) {
313                 snprintf(tmp, sizeof(tmp), " (ignored %d more)",
314                          le16_to_cpu(l->d_npartitions) - max_partitions);
315                 strlcat(state->pp_buf, tmp, PAGE_SIZE);
316         }
317         strlcat(state->pp_buf, " >\n", PAGE_SIZE);
318 }
319 #endif
320 
321 static void parse_freebsd(struct parsed_partitions *state,
322                           sector_t offset, sector_t size, int origin)
323 {
324 #ifdef CONFIG_BSD_DISKLABEL
325         parse_bsd(state, offset, size, origin, "bsd", BSD_MAXPARTITIONS);
326 #endif
327 }
328 
329 static void parse_netbsd(struct parsed_partitions *state,
330                          sector_t offset, sector_t size, int origin)
331 {
332 #ifdef CONFIG_BSD_DISKLABEL
333         parse_bsd(state, offset, size, origin, "netbsd", BSD_MAXPARTITIONS);
334 #endif
335 }
336 
337 static void parse_openbsd(struct parsed_partitions *state,
338                           sector_t offset, sector_t size, int origin)
339 {
340 #ifdef CONFIG_BSD_DISKLABEL
341         parse_bsd(state, offset, size, origin, "openbsd",
342                   OPENBSD_MAXPARTITIONS);
343 #endif
344 }
345 
346 /*
347  * Create devices for Unixware partitions listed in a disklabel, under a
348  * dos-like partition. See parse_extended() for more information.
349  */
350 static void parse_unixware(struct parsed_partitions *state,
351                            sector_t offset, sector_t size, int origin)
352 {
353 #ifdef CONFIG_UNIXWARE_DISKLABEL
354         Sector sect;
355         struct unixware_disklabel *l;
356         struct unixware_slice *p;
357 
358         l = read_part_sector(state, offset + 29, &sect);
359         if (!l)
360                 return;
361         if (le32_to_cpu(l->d_magic) != UNIXWARE_DISKMAGIC ||
362             le32_to_cpu(l->vtoc.v_magic) != UNIXWARE_DISKMAGIC2) {
363                 put_dev_sector(sect);
364                 return;
365         }
366         {
367                 char tmp[1 + BDEVNAME_SIZE + 10 + 12 + 1];
368 
369                 snprintf(tmp, sizeof(tmp), " %s%d: <unixware:", state->name, origin);
370                 strlcat(state->pp_buf, tmp, PAGE_SIZE);
371         }
372         p = &l->vtoc.v_slice[1];
373         /* I omit the 0th slice as it is the same as whole disk. */
374         while (p - &l->vtoc.v_slice[0] < UNIXWARE_NUMSLICE) {
375                 if (state->next == state->limit)
376                         break;
377 
378                 if (p->s_label != UNIXWARE_FS_UNUSED)
379                         put_partition(state, state->next++,
380                                       le32_to_cpu(p->start_sect),
381                                       le32_to_cpu(p->nr_sects));
382                 p++;
383         }
384         put_dev_sector(sect);
385         strlcat(state->pp_buf, " >\n", PAGE_SIZE);
386 #endif
387 }
388 
389 /*
390  * Minix 2.0.0/2.0.2 subpartition support.
391  * Anand Krishnamurthy <anandk@wiproge.med.ge.com>
392  * Rajeev V. Pillai    <rajeevvp@yahoo.com>
393  */
394 static void parse_minix(struct parsed_partitions *state,
395                         sector_t offset, sector_t size, int origin)
396 {
397 #ifdef CONFIG_MINIX_SUBPARTITION
398         Sector sect;
399         unsigned char *data;
400         struct partition *p;
401         int i;
402 
403         data = read_part_sector(state, offset, &sect);
404         if (!data)
405                 return;
406 
407         p = (struct partition *)(data + 0x1be);
408 
409         /* The first sector of a Minix partition can have either
410          * a secondary MBR describing its subpartitions, or
411          * the normal boot sector. */
412         if (msdos_magic_present (data + 510) &&
413             SYS_IND(p) == MINIX_PARTITION) { /* subpartition table present */
414                 char tmp[1 + BDEVNAME_SIZE + 10 + 9 + 1];
415 
416                 snprintf(tmp, sizeof(tmp), " %s%d: <minix:", state->name, origin);
417                 strlcat(state->pp_buf, tmp, PAGE_SIZE);
418                 for (i = 0; i < MINIX_NR_SUBPARTITIONS; i++, p++) {
419                         if (state->next == state->limit)
420                                 break;
421                         /* add each partition in use */
422                         if (SYS_IND(p) == MINIX_PARTITION)
423                                 put_partition(state, state->next++,
424                                               start_sect(p), nr_sects(p));
425                 }
426                 strlcat(state->pp_buf, " >\n", PAGE_SIZE);
427         }
428         put_dev_sector(sect);
429 #endif /* CONFIG_MINIX_SUBPARTITION */
430 }
431 
432 static struct {
433         unsigned char id;
434         void (*parse)(struct parsed_partitions *, sector_t, sector_t, int);
435 } subtypes[] = {
436         {FREEBSD_PARTITION, parse_freebsd},
437         {NETBSD_PARTITION, parse_netbsd},
438         {OPENBSD_PARTITION, parse_openbsd},
439         {MINIX_PARTITION, parse_minix},
440         {UNIXWARE_PARTITION, parse_unixware},
441         {SOLARIS_X86_PARTITION, parse_solaris_x86},
442         {NEW_SOLARIS_X86_PARTITION, parse_solaris_x86},
443         {0, NULL},
444 };
445 
446 int msdos_partition(struct parsed_partitions *state)
447 {
448         sector_t sector_size = bdev_logical_block_size(state->bdev) / 512;
449         Sector sect;
450         unsigned char *data;
451         struct partition *p;
452         struct fat_boot_sector *fb;
453         int slot;
454         u32 disksig;
455 
456         data = read_part_sector(state, 0, &sect);
457         if (!data)
458                 return -1;
459 
460         /*
461          * Note order! (some AIX disks, e.g. unbootable kind,
462          * have no MSDOS 55aa)
463          */
464         if (aix_magic_present(state, data)) {
465                 put_dev_sector(sect);
466 #ifdef CONFIG_AIX_PARTITION
467                 return aix_partition(state);
468 #else
469                 strlcat(state->pp_buf, " [AIX]", PAGE_SIZE);
470                 return 0;
471 #endif
472         }
473 
474         if (!msdos_magic_present(data + 510)) {
475                 put_dev_sector(sect);
476                 return 0;
477         }
478 
479         /*
480          * Now that the 55aa signature is present, this is probably
481          * either the boot sector of a FAT filesystem or a DOS-type
482          * partition table. Reject this in case the boot indicator
483          * is not 0 or 0x80.
484          */
485         p = (struct partition *) (data + 0x1be);
486         for (slot = 1; slot <= 4; slot++, p++) {
487                 if (p->boot_ind != 0 && p->boot_ind != 0x80) {
488                         /*
489                          * Even without a valid boot inidicator value
490                          * its still possible this is valid FAT filesystem
491                          * without a partition table.
492                          */
493                         fb = (struct fat_boot_sector *) data;
494                         if (slot == 1 && fb->reserved && fb->fats
495                                 && fat_valid_media(fb->media)) {
496                                 strlcat(state->pp_buf, "\n", PAGE_SIZE);
497                                 put_dev_sector(sect);
498                                 return 1;
499                         } else {
500                                 put_dev_sector(sect);
501                                 return 0;
502                         }
503                 }
504         }
505 
506 #ifdef CONFIG_EFI_PARTITION
507         p = (struct partition *) (data + 0x1be);
508         for (slot = 1 ; slot <= 4 ; slot++, p++) {
509                 /* If this is an EFI GPT disk, msdos should ignore it. */
510                 if (SYS_IND(p) == EFI_PMBR_OSTYPE_EFI_GPT) {
511                         put_dev_sector(sect);
512                         return 0;
513                 }
514         }
515 #endif
516         p = (struct partition *) (data + 0x1be);
517 
518         disksig = le32_to_cpup((__le32 *)(data + 0x1b8));
519 
520         /*
521          * Look for partitions in two passes:
522          * First find the primary and DOS-type extended partitions.
523          * On the second pass look inside *BSD, Unixware and Solaris partitions.
524          */
525 
526         state->next = 5;
527         for (slot = 1 ; slot <= 4 ; slot++, p++) {
528                 sector_t start = start_sect(p)*sector_size;
529                 sector_t size = nr_sects(p)*sector_size;
530                 if (!size)
531                         continue;
532                 if (is_extended_partition(p)) {
533                         /*
534                          * prevent someone doing mkfs or mkswap on an
535                          * extended partition, but leave room for LILO
536                          * FIXME: this uses one logical sector for > 512b
537                          * sector, although it may not be enough/proper.
538                          */
539                         sector_t n = 2;
540                         n = min(size, max(sector_size, n));
541                         put_partition(state, slot, start, n);
542 
543                         strlcat(state->pp_buf, " <", PAGE_SIZE);
544                         parse_extended(state, start, size, disksig);
545                         strlcat(state->pp_buf, " >", PAGE_SIZE);
546                         continue;
547                 }
548                 put_partition(state, slot, start, size);
549                 set_info(state, slot, disksig);
550                 if (SYS_IND(p) == LINUX_RAID_PARTITION)
551                         state->parts[slot].flags = ADDPART_FLAG_RAID;
552                 if (SYS_IND(p) == DM6_PARTITION)
553                         strlcat(state->pp_buf, "[DM]", PAGE_SIZE);
554                 if (SYS_IND(p) == EZD_PARTITION)
555                         strlcat(state->pp_buf, "[EZD]", PAGE_SIZE);
556         }
557 
558         strlcat(state->pp_buf, "\n", PAGE_SIZE);
559 
560         /* second pass - output for each on a separate line */
561         p = (struct partition *) (0x1be + data);
562         for (slot = 1 ; slot <= 4 ; slot++, p++) {
563                 unsigned char id = SYS_IND(p);
564                 int n;
565 
566                 if (!nr_sects(p))
567                         continue;
568 
569                 for (n = 0; subtypes[n].parse && id != subtypes[n].id; n++)
570                         ;
571 
572                 if (!subtypes[n].parse)
573                         continue;
574                 subtypes[n].parse(state, start_sect(p) * sector_size,
575                                   nr_sects(p) * sector_size, slot);
576         }
577         put_dev_sector(sect);
578         return 1;
579 }
580 

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