blob: 8752a5d265653a5a743c333c9c99bb259aca554b [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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 */
Frank Seidel0607fd02008-04-28 02:16:31 -070021#include <linux/msdos_fs.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070022
23#include "check.h"
24#include "msdos.h"
25#include "efi.h"
26
27/*
28 * Many architectures don't like unaligned accesses, while
29 * the nr_sects and start_sect partition table entries are
30 * at a 2 (mod 4) address.
31 */
32#include <asm/unaligned.h>
33
Daniel Taylor3fbf5862010-03-23 13:35:50 -070034#define SYS_IND(p) get_unaligned(&p->sys_ind)
Linus Torvalds1da177e2005-04-16 15:20:36 -070035
Daniel Taylor3fbf5862010-03-23 13:35:50 -070036static inline sector_t nr_sects(struct partition *p)
37{
38 return (sector_t)get_unaligned_le32(&p->nr_sects);
39}
40
41static inline sector_t start_sect(struct partition *p)
42{
43 return (sector_t)get_unaligned_le32(&p->start_sect);
44}
Linus Torvalds1da177e2005-04-16 15:20:36 -070045
46static inline int is_extended_partition(struct partition *p)
47{
48 return (SYS_IND(p) == DOS_EXTENDED_PARTITION ||
49 SYS_IND(p) == WIN98_EXTENDED_PARTITION ||
50 SYS_IND(p) == LINUX_EXTENDED_PARTITION);
51}
52
53#define MSDOS_LABEL_MAGIC1 0x55
54#define MSDOS_LABEL_MAGIC2 0xAA
55
56static inline int
57msdos_magic_present(unsigned char *p)
58{
59 return (p[0] == MSDOS_LABEL_MAGIC1 && p[1] == MSDOS_LABEL_MAGIC2);
60}
61
Olaf Heringe1dfa922006-09-29 01:59:39 -070062/* Value is EBCDIC 'IBMA' */
63#define AIX_LABEL_MAGIC1 0xC9
64#define AIX_LABEL_MAGIC2 0xC2
65#define AIX_LABEL_MAGIC3 0xD4
66#define AIX_LABEL_MAGIC4 0xC1
Tejun Heo1493bf22010-05-15 20:09:30 +020067static int aix_magic_present(struct parsed_partitions *state, unsigned char *p)
Olaf Heringe1dfa922006-09-29 01:59:39 -070068{
Olaf Hering4419d1a2007-02-10 01:45:47 -080069 struct partition *pt = (struct partition *) (p + 0x1be);
Olaf Heringe1dfa922006-09-29 01:59:39 -070070 Sector sect;
71 unsigned char *d;
Olaf Hering4419d1a2007-02-10 01:45:47 -080072 int slot, ret = 0;
Olaf Heringe1dfa922006-09-29 01:59:39 -070073
Olaf Heringa470e182007-02-10 01:45:48 -080074 if (!(p[0] == AIX_LABEL_MAGIC1 &&
75 p[1] == AIX_LABEL_MAGIC2 &&
76 p[2] == AIX_LABEL_MAGIC3 &&
77 p[3] == AIX_LABEL_MAGIC4))
Olaf Heringe1dfa922006-09-29 01:59:39 -070078 return 0;
Olaf Hering4419d1a2007-02-10 01:45:47 -080079 /* Assume the partition table is valid if Linux partitions exists */
80 for (slot = 1; slot <= 4; slot++, pt++) {
81 if (pt->sys_ind == LINUX_SWAP_PARTITION ||
82 pt->sys_ind == LINUX_RAID_PARTITION ||
83 pt->sys_ind == LINUX_DATA_PARTITION ||
84 pt->sys_ind == LINUX_LVM_PARTITION ||
85 is_extended_partition(pt))
86 return 0;
87 }
Tejun Heo1493bf22010-05-15 20:09:30 +020088 d = read_part_sector(state, 7, &sect);
Olaf Heringe1dfa922006-09-29 01:59:39 -070089 if (d) {
90 if (d[0] == '_' && d[1] == 'L' && d[2] == 'V' && d[3] == 'M')
91 ret = 1;
92 put_dev_sector(sect);
93 };
94 return ret;
95}
96
Stephen Warrend33b98f2012-11-08 16:12:28 -080097static void set_info(struct parsed_partitions *state, int slot,
98 u32 disksig)
99{
100 struct partition_meta_info *info = &state->parts[slot].info;
101
102 snprintf(info->uuid, sizeof(info->uuid), "%08x-%02x", disksig,
103 slot);
104 info->volname[0] = 0;
105 state->parts[slot].has_info = true;
106}
107
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108/*
109 * Create devices for each logical partition in an extended partition.
110 * The logical partitions form a linked list, with each entry being
111 * a partition table with two entries. The first entry
112 * is the real data partition (with a start relative to the partition
113 * table start). The second is a pointer to the next logical partition
114 * (with a start relative to the entire extended partition).
115 * We do not create a Linux partition for the partition tables, but
116 * only for the actual data partitions.
117 */
118
Tejun Heo1493bf22010-05-15 20:09:30 +0200119static void parse_extended(struct parsed_partitions *state,
Stephen Warrend33b98f2012-11-08 16:12:28 -0800120 sector_t first_sector, sector_t first_size,
121 u32 disksig)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122{
123 struct partition *p;
124 Sector sect;
125 unsigned char *data;
Daniel Taylor3fbf5862010-03-23 13:35:50 -0700126 sector_t this_sector, this_size;
Tejun Heo1493bf22010-05-15 20:09:30 +0200127 sector_t sector_size = bdev_logical_block_size(state->bdev) / 512;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128 int loopct = 0; /* number of links followed
129 without finding a data partition */
130 int i;
131
132 this_sector = first_sector;
133 this_size = first_size;
134
135 while (1) {
136 if (++loopct > 100)
137 return;
138 if (state->next == state->limit)
139 return;
Tejun Heo1493bf22010-05-15 20:09:30 +0200140 data = read_part_sector(state, this_sector, &sect);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141 if (!data)
142 return;
143
144 if (!msdos_magic_present(data + 510))
145 goto done;
146
147 p = (struct partition *) (data + 0x1be);
148
149 /*
150 * Usually, the first entry is the real data partition,
151 * the 2nd entry is the next extended partition, or empty,
152 * and the 3rd and 4th entries are unused.
153 * However, DRDOS sometimes has the extended partition as
154 * the first entry (when the data partition is empty),
155 * and OS/2 seems to use all four entries.
156 */
157
158 /*
159 * First process the data partition(s)
160 */
161 for (i=0; i<4; i++, p++) {
Daniel Taylor3fbf5862010-03-23 13:35:50 -0700162 sector_t offs, size, next;
163 if (!nr_sects(p) || is_extended_partition(p))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 continue;
165
166 /* Check the 3rd and 4th entries -
167 these sometimes contain random garbage */
Daniel Taylor3fbf5862010-03-23 13:35:50 -0700168 offs = start_sect(p)*sector_size;
169 size = nr_sects(p)*sector_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170 next = this_sector + offs;
171 if (i >= 2) {
172 if (offs + size > this_size)
173 continue;
174 if (next < first_sector)
175 continue;
176 if (next + size > first_sector + first_size)
177 continue;
178 }
179
180 put_partition(state, state->next, next, size);
Stephen Warrend33b98f2012-11-08 16:12:28 -0800181 set_info(state, state->next, disksig);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182 if (SYS_IND(p) == LINUX_RAID_PARTITION)
Fabio Massimo Di Nittod18d7682007-02-10 23:50:00 -0800183 state->parts[state->next].flags = ADDPART_FLAG_RAID;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184 loopct = 0;
185 if (++state->next == state->limit)
186 goto done;
187 }
188 /*
189 * Next, process the (first) extended partition, if present.
190 * (So far, there seems to be no reason to make
191 * parse_extended() recursive and allow a tree
192 * of extended partitions.)
193 * It should be a link to the next logical partition.
194 */
195 p -= 4;
196 for (i=0; i<4; i++, p++)
Daniel Taylor3fbf5862010-03-23 13:35:50 -0700197 if (nr_sects(p) && is_extended_partition(p))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198 break;
199 if (i == 4)
200 goto done; /* nothing left to do */
201
Daniel Taylor3fbf5862010-03-23 13:35:50 -0700202 this_sector = first_sector + start_sect(p) * sector_size;
203 this_size = nr_sects(p) * sector_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204 put_dev_sector(sect);
205 }
206done:
207 put_dev_sector(sect);
208}
209
210/* james@bpgc.com: Solaris has a nasty indicator: 0x82 which also
211 indicates linux swap. Be careful before believing this is Solaris. */
212
Tejun Heo1493bf22010-05-15 20:09:30 +0200213static void parse_solaris_x86(struct parsed_partitions *state,
214 sector_t offset, sector_t size, int origin)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215{
216#ifdef CONFIG_SOLARIS_X86_PARTITION
217 Sector sect;
218 struct solaris_x86_vtoc *v;
219 int i;
Mark Fortescueb84d8792007-07-25 18:30:08 -0700220 short max_nparts;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221
Tejun Heo1493bf22010-05-15 20:09:30 +0200222 v = read_part_sector(state, offset + 1, &sect);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223 if (!v)
224 return;
225 if (le32_to_cpu(v->v_sanity) != SOLARIS_X86_VTOC_SANE) {
226 put_dev_sector(sect);
227 return;
228 }
Alexey Dobriyan9c867fb2010-08-10 18:03:14 -0700229 {
230 char tmp[1 + BDEVNAME_SIZE + 10 + 11 + 1];
231
232 snprintf(tmp, sizeof(tmp), " %s%d: <solaris:", state->name, origin);
233 strlcat(state->pp_buf, tmp, PAGE_SIZE);
234 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235 if (le32_to_cpu(v->v_version) != 1) {
Alexey Dobriyan9c867fb2010-08-10 18:03:14 -0700236 char tmp[64];
237
238 snprintf(tmp, sizeof(tmp), " cannot handle version %d vtoc>\n",
239 le32_to_cpu(v->v_version));
240 strlcat(state->pp_buf, tmp, PAGE_SIZE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241 put_dev_sector(sect);
242 return;
243 }
Mark Fortescueb84d8792007-07-25 18:30:08 -0700244 /* Ensure we can handle previous case of VTOC with 8 entries gracefully */
245 max_nparts = le16_to_cpu (v->v_nparts) > 8 ? SOLARIS_X86_NUMSLICE : 8;
246 for (i=0; i<max_nparts && state->next<state->limit; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247 struct solaris_x86_slice *s = &v->v_slice[i];
Alexey Dobriyan9c867fb2010-08-10 18:03:14 -0700248 char tmp[3 + 10 + 1 + 1];
249
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250 if (s->s_size == 0)
251 continue;
Alexey Dobriyan9c867fb2010-08-10 18:03:14 -0700252 snprintf(tmp, sizeof(tmp), " [s%d]", i);
253 strlcat(state->pp_buf, tmp, PAGE_SIZE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254 /* solaris partitions are relative to current MS-DOS
255 * one; must add the offset of the current partition */
256 put_partition(state, state->next++,
257 le32_to_cpu(s->s_start)+offset,
258 le32_to_cpu(s->s_size));
259 }
260 put_dev_sector(sect);
Alexey Dobriyan9c867fb2010-08-10 18:03:14 -0700261 strlcat(state->pp_buf, " >\n", PAGE_SIZE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262#endif
263}
264
Adrian Bunk486fd402005-06-25 14:58:47 -0700265#if defined(CONFIG_BSD_DISKLABEL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266/*
267 * Create devices for BSD partitions listed in a disklabel, under a
268 * dos-like partition. See parse_extended() for more information.
269 */
Tejun Heo1493bf22010-05-15 20:09:30 +0200270static void parse_bsd(struct parsed_partitions *state,
271 sector_t offset, sector_t size, int origin, char *flavour,
272 int max_partitions)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273{
274 Sector sect;
275 struct bsd_disklabel *l;
276 struct bsd_partition *p;
Alexey Dobriyan9c867fb2010-08-10 18:03:14 -0700277 char tmp[64];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278
Tejun Heo1493bf22010-05-15 20:09:30 +0200279 l = read_part_sector(state, offset + 1, &sect);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280 if (!l)
281 return;
282 if (le32_to_cpu(l->d_magic) != BSD_DISKMAGIC) {
283 put_dev_sector(sect);
284 return;
285 }
Alexey Dobriyan9c867fb2010-08-10 18:03:14 -0700286
287 snprintf(tmp, sizeof(tmp), " %s%d: <%s:", state->name, origin, flavour);
288 strlcat(state->pp_buf, tmp, PAGE_SIZE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289
290 if (le16_to_cpu(l->d_npartitions) < max_partitions)
291 max_partitions = le16_to_cpu(l->d_npartitions);
292 for (p = l->d_partitions; p - l->d_partitions < max_partitions; p++) {
Daniel Taylor3fbf5862010-03-23 13:35:50 -0700293 sector_t bsd_start, bsd_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294
295 if (state->next == state->limit)
296 break;
297 if (p->p_fstype == BSD_FS_UNUSED)
298 continue;
299 bsd_start = le32_to_cpu(p->p_offset);
300 bsd_size = le32_to_cpu(p->p_size);
301 if (offset == bsd_start && size == bsd_size)
302 /* full parent partition, we have it already */
303 continue;
304 if (offset > bsd_start || offset+size < bsd_start+bsd_size) {
Alexey Dobriyan9c867fb2010-08-10 18:03:14 -0700305 strlcat(state->pp_buf, "bad subpartition - ignored\n", PAGE_SIZE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306 continue;
307 }
308 put_partition(state, state->next++, bsd_start, bsd_size);
309 }
310 put_dev_sector(sect);
Alexey Dobriyan9c867fb2010-08-10 18:03:14 -0700311 if (le16_to_cpu(l->d_npartitions) > max_partitions) {
312 snprintf(tmp, sizeof(tmp), " (ignored %d more)",
313 le16_to_cpu(l->d_npartitions) - max_partitions);
314 strlcat(state->pp_buf, tmp, PAGE_SIZE);
315 }
316 strlcat(state->pp_buf, " >\n", PAGE_SIZE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317}
318#endif
319
Tejun Heo1493bf22010-05-15 20:09:30 +0200320static void parse_freebsd(struct parsed_partitions *state,
321 sector_t offset, sector_t size, int origin)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322{
323#ifdef CONFIG_BSD_DISKLABEL
Tejun Heo1493bf22010-05-15 20:09:30 +0200324 parse_bsd(state, offset, size, origin, "bsd", BSD_MAXPARTITIONS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325#endif
326}
327
Tejun Heo1493bf22010-05-15 20:09:30 +0200328static void parse_netbsd(struct parsed_partitions *state,
329 sector_t offset, sector_t size, int origin)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330{
331#ifdef CONFIG_BSD_DISKLABEL
Tejun Heo1493bf22010-05-15 20:09:30 +0200332 parse_bsd(state, offset, size, origin, "netbsd", BSD_MAXPARTITIONS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333#endif
334}
335
Tejun Heo1493bf22010-05-15 20:09:30 +0200336static void parse_openbsd(struct parsed_partitions *state,
337 sector_t offset, sector_t size, int origin)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338{
339#ifdef CONFIG_BSD_DISKLABEL
Tejun Heo1493bf22010-05-15 20:09:30 +0200340 parse_bsd(state, offset, size, origin, "openbsd",
341 OPENBSD_MAXPARTITIONS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342#endif
343}
344
345/*
346 * Create devices for Unixware partitions listed in a disklabel, under a
347 * dos-like partition. See parse_extended() for more information.
348 */
Tejun Heo1493bf22010-05-15 20:09:30 +0200349static void parse_unixware(struct parsed_partitions *state,
350 sector_t offset, sector_t size, int origin)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351{
352#ifdef CONFIG_UNIXWARE_DISKLABEL
353 Sector sect;
354 struct unixware_disklabel *l;
355 struct unixware_slice *p;
356
Tejun Heo1493bf22010-05-15 20:09:30 +0200357 l = read_part_sector(state, offset + 29, &sect);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358 if (!l)
359 return;
360 if (le32_to_cpu(l->d_magic) != UNIXWARE_DISKMAGIC ||
361 le32_to_cpu(l->vtoc.v_magic) != UNIXWARE_DISKMAGIC2) {
362 put_dev_sector(sect);
363 return;
364 }
Alexey Dobriyan9c867fb2010-08-10 18:03:14 -0700365 {
366 char tmp[1 + BDEVNAME_SIZE + 10 + 12 + 1];
367
368 snprintf(tmp, sizeof(tmp), " %s%d: <unixware:", state->name, origin);
369 strlcat(state->pp_buf, tmp, PAGE_SIZE);
370 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371 p = &l->vtoc.v_slice[1];
372 /* I omit the 0th slice as it is the same as whole disk. */
373 while (p - &l->vtoc.v_slice[0] < UNIXWARE_NUMSLICE) {
374 if (state->next == state->limit)
375 break;
376
377 if (p->s_label != UNIXWARE_FS_UNUSED)
378 put_partition(state, state->next++,
Daniel Taylor3fbf5862010-03-23 13:35:50 -0700379 le32_to_cpu(p->start_sect),
380 le32_to_cpu(p->nr_sects));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381 p++;
382 }
383 put_dev_sector(sect);
Alexey Dobriyan9c867fb2010-08-10 18:03:14 -0700384 strlcat(state->pp_buf, " >\n", PAGE_SIZE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385#endif
386}
387
388/*
389 * Minix 2.0.0/2.0.2 subpartition support.
390 * Anand Krishnamurthy <anandk@wiproge.med.ge.com>
391 * Rajeev V. Pillai <rajeevvp@yahoo.com>
392 */
Tejun Heo1493bf22010-05-15 20:09:30 +0200393static void parse_minix(struct parsed_partitions *state,
394 sector_t offset, sector_t size, int origin)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395{
396#ifdef CONFIG_MINIX_SUBPARTITION
397 Sector sect;
398 unsigned char *data;
399 struct partition *p;
400 int i;
401
Tejun Heo1493bf22010-05-15 20:09:30 +0200402 data = read_part_sector(state, offset, &sect);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403 if (!data)
404 return;
405
406 p = (struct partition *)(data + 0x1be);
407
408 /* The first sector of a Minix partition can have either
409 * a secondary MBR describing its subpartitions, or
410 * the normal boot sector. */
411 if (msdos_magic_present (data + 510) &&
412 SYS_IND(p) == MINIX_PARTITION) { /* subpartition table present */
Alexey Dobriyan9c867fb2010-08-10 18:03:14 -0700413 char tmp[1 + BDEVNAME_SIZE + 10 + 9 + 1];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414
Alexey Dobriyan9c867fb2010-08-10 18:03:14 -0700415 snprintf(tmp, sizeof(tmp), " %s%d: <minix:", state->name, origin);
416 strlcat(state->pp_buf, tmp, PAGE_SIZE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417 for (i = 0; i < MINIX_NR_SUBPARTITIONS; i++, p++) {
418 if (state->next == state->limit)
419 break;
420 /* add each partition in use */
421 if (SYS_IND(p) == MINIX_PARTITION)
422 put_partition(state, state->next++,
Daniel Taylor3fbf5862010-03-23 13:35:50 -0700423 start_sect(p), nr_sects(p));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424 }
Alexey Dobriyan9c867fb2010-08-10 18:03:14 -0700425 strlcat(state->pp_buf, " >\n", PAGE_SIZE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426 }
427 put_dev_sector(sect);
428#endif /* CONFIG_MINIX_SUBPARTITION */
429}
430
431static struct {
432 unsigned char id;
Tejun Heo1493bf22010-05-15 20:09:30 +0200433 void (*parse)(struct parsed_partitions *, sector_t, sector_t, int);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434} subtypes[] = {
435 {FREEBSD_PARTITION, parse_freebsd},
436 {NETBSD_PARTITION, parse_netbsd},
437 {OPENBSD_PARTITION, parse_openbsd},
438 {MINIX_PARTITION, parse_minix},
439 {UNIXWARE_PARTITION, parse_unixware},
440 {SOLARIS_X86_PARTITION, parse_solaris_x86},
441 {NEW_SOLARIS_X86_PARTITION, parse_solaris_x86},
442 {0, NULL},
443};
444
Tejun Heo1493bf22010-05-15 20:09:30 +0200445int msdos_partition(struct parsed_partitions *state)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446{
Tejun Heo1493bf22010-05-15 20:09:30 +0200447 sector_t sector_size = bdev_logical_block_size(state->bdev) / 512;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448 Sector sect;
449 unsigned char *data;
450 struct partition *p;
Frank Seidel0607fd02008-04-28 02:16:31 -0700451 struct fat_boot_sector *fb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452 int slot;
Stephen Warrend33b98f2012-11-08 16:12:28 -0800453 u32 disksig;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454
Tejun Heo1493bf22010-05-15 20:09:30 +0200455 data = read_part_sector(state, 0, &sect);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456 if (!data)
457 return -1;
458 if (!msdos_magic_present(data + 510)) {
459 put_dev_sector(sect);
460 return 0;
461 }
462
Tejun Heo1493bf22010-05-15 20:09:30 +0200463 if (aix_magic_present(state, data)) {
Olaf Heringe1dfa922006-09-29 01:59:39 -0700464 put_dev_sector(sect);
Alexey Dobriyan9c867fb2010-08-10 18:03:14 -0700465 strlcat(state->pp_buf, " [AIX]", PAGE_SIZE);
Olaf Heringe1dfa922006-09-29 01:59:39 -0700466 return 0;
467 }
468
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469 /*
470 * Now that the 55aa signature is present, this is probably
471 * either the boot sector of a FAT filesystem or a DOS-type
472 * partition table. Reject this in case the boot indicator
473 * is not 0 or 0x80.
474 */
475 p = (struct partition *) (data + 0x1be);
476 for (slot = 1; slot <= 4; slot++, p++) {
477 if (p->boot_ind != 0 && p->boot_ind != 0x80) {
Frank Seidel0607fd02008-04-28 02:16:31 -0700478 /*
479 * Even without a valid boot inidicator value
480 * its still possible this is valid FAT filesystem
481 * without a partition table.
482 */
483 fb = (struct fat_boot_sector *) data;
484 if (slot == 1 && fb->reserved && fb->fats
485 && fat_valid_media(fb->media)) {
Alexey Dobriyan9c867fb2010-08-10 18:03:14 -0700486 strlcat(state->pp_buf, "\n", PAGE_SIZE);
Frank Seidel0607fd02008-04-28 02:16:31 -0700487 put_dev_sector(sect);
488 return 1;
489 } else {
490 put_dev_sector(sect);
491 return 0;
492 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493 }
494 }
495
496#ifdef CONFIG_EFI_PARTITION
497 p = (struct partition *) (data + 0x1be);
498 for (slot = 1 ; slot <= 4 ; slot++, p++) {
499 /* If this is an EFI GPT disk, msdos should ignore it. */
500 if (SYS_IND(p) == EFI_PMBR_OSTYPE_EFI_GPT) {
501 put_dev_sector(sect);
502 return 0;
503 }
504 }
505#endif
506 p = (struct partition *) (data + 0x1be);
507
Stephen Warrend33b98f2012-11-08 16:12:28 -0800508 disksig = le32_to_cpup((__le32 *)(data + 0x1b8));
509
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510 /*
511 * Look for partitions in two passes:
512 * First find the primary and DOS-type extended partitions.
513 * On the second pass look inside *BSD, Unixware and Solaris partitions.
514 */
515
516 state->next = 5;
517 for (slot = 1 ; slot <= 4 ; slot++, p++) {
Daniel Taylor3fbf5862010-03-23 13:35:50 -0700518 sector_t start = start_sect(p)*sector_size;
519 sector_t size = nr_sects(p)*sector_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700520 if (!size)
521 continue;
522 if (is_extended_partition(p)) {
OGAWA Hirofumi8e0cc812010-03-23 13:35:50 -0700523 /*
524 * prevent someone doing mkfs or mkswap on an
525 * extended partition, but leave room for LILO
526 * FIXME: this uses one logical sector for > 512b
527 * sector, although it may not be enough/proper.
528 */
529 sector_t n = 2;
530 n = min(size, max(sector_size, n));
531 put_partition(state, slot, start, n);
532
Alexey Dobriyan9c867fb2010-08-10 18:03:14 -0700533 strlcat(state->pp_buf, " <", PAGE_SIZE);
Stephen Warrend33b98f2012-11-08 16:12:28 -0800534 parse_extended(state, start, size, disksig);
Alexey Dobriyan9c867fb2010-08-10 18:03:14 -0700535 strlcat(state->pp_buf, " >", PAGE_SIZE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536 continue;
537 }
538 put_partition(state, slot, start, size);
Stephen Warrend33b98f2012-11-08 16:12:28 -0800539 set_info(state, slot, disksig);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540 if (SYS_IND(p) == LINUX_RAID_PARTITION)
Cesar Eduardo Barroscc910622010-04-17 19:28:09 -0300541 state->parts[slot].flags = ADDPART_FLAG_RAID;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542 if (SYS_IND(p) == DM6_PARTITION)
Alexey Dobriyan9c867fb2010-08-10 18:03:14 -0700543 strlcat(state->pp_buf, "[DM]", PAGE_SIZE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544 if (SYS_IND(p) == EZD_PARTITION)
Alexey Dobriyan9c867fb2010-08-10 18:03:14 -0700545 strlcat(state->pp_buf, "[EZD]", PAGE_SIZE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546 }
547
Alexey Dobriyan9c867fb2010-08-10 18:03:14 -0700548 strlcat(state->pp_buf, "\n", PAGE_SIZE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549
550 /* second pass - output for each on a separate line */
551 p = (struct partition *) (0x1be + data);
552 for (slot = 1 ; slot <= 4 ; slot++, p++) {
553 unsigned char id = SYS_IND(p);
554 int n;
555
Daniel Taylor3fbf5862010-03-23 13:35:50 -0700556 if (!nr_sects(p))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557 continue;
558
559 for (n = 0; subtypes[n].parse && id != subtypes[n].id; n++)
560 ;
561
562 if (!subtypes[n].parse)
563 continue;
Tejun Heo1493bf22010-05-15 20:09:30 +0200564 subtypes[n].parse(state, start_sect(p) * sector_size,
565 nr_sects(p) * sector_size, slot);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566 }
567 put_dev_sector(sect);
568 return 1;
569}