Commit | Line | Data |
---|---|---|
1da177e4 LT |
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 | */ | |
0607fd02 | 21 | #include <linux/msdos_fs.h> |
1da177e4 LT |
22 | |
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 | ||
3fbf586c | 34 | #define SYS_IND(p) get_unaligned(&p->sys_ind) |
1da177e4 | 35 | |
3fbf586c DT |
36 | static inline sector_t nr_sects(struct partition *p) |
37 | { | |
38 | return (sector_t)get_unaligned_le32(&p->nr_sects); | |
39 | } | |
40 | ||
41 | static inline sector_t start_sect(struct partition *p) | |
42 | { | |
43 | return (sector_t)get_unaligned_le32(&p->start_sect); | |
44 | } | |
1da177e4 LT |
45 | |
46 | static 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 | ||
56 | static inline int | |
57 | msdos_magic_present(unsigned char *p) | |
58 | { | |
59 | return (p[0] == MSDOS_LABEL_MAGIC1 && p[1] == MSDOS_LABEL_MAGIC2); | |
60 | } | |
61 | ||
e1dfa92d OH |
62 | /* 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 | |
1493bf21 | 67 | static int aix_magic_present(struct parsed_partitions *state, unsigned char *p) |
e1dfa92d | 68 | { |
4419d1ac | 69 | struct partition *pt = (struct partition *) (p + 0x1be); |
e1dfa92d OH |
70 | Sector sect; |
71 | unsigned char *d; | |
4419d1ac | 72 | int slot, ret = 0; |
e1dfa92d | 73 | |
a470e18f OH |
74 | if (!(p[0] == AIX_LABEL_MAGIC1 && |
75 | p[1] == AIX_LABEL_MAGIC2 && | |
76 | p[2] == AIX_LABEL_MAGIC3 && | |
77 | p[3] == AIX_LABEL_MAGIC4)) | |
e1dfa92d | 78 | return 0; |
4419d1ac OH |
79 | /* 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 | } | |
1493bf21 | 88 | d = read_part_sector(state, 7, §); |
e1dfa92d OH |
89 | 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 | ||
d33b98fc SW |
97 | static 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 | ||
1da177e4 LT |
108 | /* |
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 | ||
1493bf21 | 119 | static void parse_extended(struct parsed_partitions *state, |
d33b98fc SW |
120 | sector_t first_sector, sector_t first_size, |
121 | u32 disksig) | |
1da177e4 LT |
122 | { |
123 | struct partition *p; | |
124 | Sector sect; | |
125 | unsigned char *data; | |
3fbf586c | 126 | sector_t this_sector, this_size; |
1493bf21 | 127 | sector_t sector_size = bdev_logical_block_size(state->bdev) / 512; |
1da177e4 LT |
128 | 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; | |
1493bf21 | 140 | data = read_part_sector(state, this_sector, §); |
1da177e4 LT |
141 | 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++) { | |
3fbf586c DT |
162 | sector_t offs, size, next; |
163 | if (!nr_sects(p) || is_extended_partition(p)) | |
1da177e4 LT |
164 | continue; |
165 | ||
166 | /* Check the 3rd and 4th entries - | |
167 | these sometimes contain random garbage */ | |
3fbf586c DT |
168 | offs = start_sect(p)*sector_size; |
169 | size = nr_sects(p)*sector_size; | |
1da177e4 LT |
170 | 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); | |
d33b98fc | 181 | set_info(state, state->next, disksig); |
1da177e4 | 182 | if (SYS_IND(p) == LINUX_RAID_PARTITION) |
d18d7682 | 183 | state->parts[state->next].flags = ADDPART_FLAG_RAID; |
1da177e4 LT |
184 | 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++) | |
3fbf586c | 197 | if (nr_sects(p) && is_extended_partition(p)) |
1da177e4 LT |
198 | break; |
199 | if (i == 4) | |
200 | goto done; /* nothing left to do */ | |
201 | ||
3fbf586c DT |
202 | this_sector = first_sector + start_sect(p) * sector_size; |
203 | this_size = nr_sects(p) * sector_size; | |
1da177e4 LT |
204 | put_dev_sector(sect); |
205 | } | |
206 | done: | |
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 | ||
1493bf21 TH |
213 | static void parse_solaris_x86(struct parsed_partitions *state, |
214 | sector_t offset, sector_t size, int origin) | |
1da177e4 LT |
215 | { |
216 | #ifdef CONFIG_SOLARIS_X86_PARTITION | |
217 | Sector sect; | |
218 | struct solaris_x86_vtoc *v; | |
219 | int i; | |
b84d8796 | 220 | short max_nparts; |
1da177e4 | 221 | |
1493bf21 | 222 | v = read_part_sector(state, offset + 1, §); |
1da177e4 LT |
223 | if (!v) |
224 | return; | |
225 | if (le32_to_cpu(v->v_sanity) != SOLARIS_X86_VTOC_SANE) { | |
226 | put_dev_sector(sect); | |
227 | return; | |
228 | } | |
9c867fbe AD |
229 | { |
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 | } | |
1da177e4 | 235 | if (le32_to_cpu(v->v_version) != 1) { |
9c867fbe AD |
236 | 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); | |
1da177e4 LT |
241 | put_dev_sector(sect); |
242 | return; | |
243 | } | |
b84d8796 MF |
244 | /* 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++) { | |
1da177e4 | 247 | struct solaris_x86_slice *s = &v->v_slice[i]; |
9c867fbe AD |
248 | char tmp[3 + 10 + 1 + 1]; |
249 | ||
1da177e4 LT |
250 | if (s->s_size == 0) |
251 | continue; | |
9c867fbe AD |
252 | snprintf(tmp, sizeof(tmp), " [s%d]", i); |
253 | strlcat(state->pp_buf, tmp, PAGE_SIZE); | |
1da177e4 LT |
254 | /* 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); | |
9c867fbe | 261 | strlcat(state->pp_buf, " >\n", PAGE_SIZE); |
1da177e4 LT |
262 | #endif |
263 | } | |
264 | ||
486fd404 | 265 | #if defined(CONFIG_BSD_DISKLABEL) |
1da177e4 LT |
266 | /* |
267 | * Create devices for BSD partitions listed in a disklabel, under a | |
268 | * dos-like partition. See parse_extended() for more information. | |
269 | */ | |
1493bf21 TH |
270 | static void parse_bsd(struct parsed_partitions *state, |
271 | sector_t offset, sector_t size, int origin, char *flavour, | |
272 | int max_partitions) | |
1da177e4 LT |
273 | { |
274 | Sector sect; | |
275 | struct bsd_disklabel *l; | |
276 | struct bsd_partition *p; | |
9c867fbe | 277 | char tmp[64]; |
1da177e4 | 278 | |
1493bf21 | 279 | l = read_part_sector(state, offset + 1, §); |
1da177e4 LT |
280 | if (!l) |
281 | return; | |
282 | if (le32_to_cpu(l->d_magic) != BSD_DISKMAGIC) { | |
283 | put_dev_sector(sect); | |
284 | return; | |
285 | } | |
9c867fbe AD |
286 | |
287 | snprintf(tmp, sizeof(tmp), " %s%d: <%s:", state->name, origin, flavour); | |
288 | strlcat(state->pp_buf, tmp, PAGE_SIZE); | |
1da177e4 LT |
289 | |
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++) { | |
3fbf586c | 293 | sector_t bsd_start, bsd_size; |
1da177e4 LT |
294 | |
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) { | |
9c867fbe | 305 | strlcat(state->pp_buf, "bad subpartition - ignored\n", PAGE_SIZE); |
1da177e4 LT |
306 | continue; |
307 | } | |
308 | put_partition(state, state->next++, bsd_start, bsd_size); | |
309 | } | |
310 | put_dev_sector(sect); | |
9c867fbe AD |
311 | 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); | |
1da177e4 LT |
317 | } |
318 | #endif | |
319 | ||
1493bf21 TH |
320 | static void parse_freebsd(struct parsed_partitions *state, |
321 | sector_t offset, sector_t size, int origin) | |
1da177e4 LT |
322 | { |
323 | #ifdef CONFIG_BSD_DISKLABEL | |
1493bf21 | 324 | parse_bsd(state, offset, size, origin, "bsd", BSD_MAXPARTITIONS); |
1da177e4 LT |
325 | #endif |
326 | } | |
327 | ||
1493bf21 TH |
328 | static void parse_netbsd(struct parsed_partitions *state, |
329 | sector_t offset, sector_t size, int origin) | |
1da177e4 LT |
330 | { |
331 | #ifdef CONFIG_BSD_DISKLABEL | |
1493bf21 | 332 | parse_bsd(state, offset, size, origin, "netbsd", BSD_MAXPARTITIONS); |
1da177e4 LT |
333 | #endif |
334 | } | |
335 | ||
1493bf21 TH |
336 | static void parse_openbsd(struct parsed_partitions *state, |
337 | sector_t offset, sector_t size, int origin) | |
1da177e4 LT |
338 | { |
339 | #ifdef CONFIG_BSD_DISKLABEL | |
1493bf21 TH |
340 | parse_bsd(state, offset, size, origin, "openbsd", |
341 | OPENBSD_MAXPARTITIONS); | |
1da177e4 LT |
342 | #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 | */ | |
1493bf21 TH |
349 | static void parse_unixware(struct parsed_partitions *state, |
350 | sector_t offset, sector_t size, int origin) | |
1da177e4 LT |
351 | { |
352 | #ifdef CONFIG_UNIXWARE_DISKLABEL | |
353 | Sector sect; | |
354 | struct unixware_disklabel *l; | |
355 | struct unixware_slice *p; | |
356 | ||
1493bf21 | 357 | l = read_part_sector(state, offset + 29, §); |
1da177e4 LT |
358 | 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 | } | |
9c867fbe AD |
365 | { |
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 | } | |
1da177e4 LT |
371 | 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++, | |
3fbf586c DT |
379 | le32_to_cpu(p->start_sect), |
380 | le32_to_cpu(p->nr_sects)); | |
1da177e4 LT |
381 | p++; |
382 | } | |
383 | put_dev_sector(sect); | |
9c867fbe | 384 | strlcat(state->pp_buf, " >\n", PAGE_SIZE); |
1da177e4 LT |
385 | #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 | */ | |
1493bf21 TH |
393 | static void parse_minix(struct parsed_partitions *state, |
394 | sector_t offset, sector_t size, int origin) | |
1da177e4 LT |
395 | { |
396 | #ifdef CONFIG_MINIX_SUBPARTITION | |
397 | Sector sect; | |
398 | unsigned char *data; | |
399 | struct partition *p; | |
400 | int i; | |
401 | ||
1493bf21 | 402 | data = read_part_sector(state, offset, §); |
1da177e4 LT |
403 | 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 */ | |
9c867fbe | 413 | char tmp[1 + BDEVNAME_SIZE + 10 + 9 + 1]; |
1da177e4 | 414 | |
9c867fbe AD |
415 | snprintf(tmp, sizeof(tmp), " %s%d: <minix:", state->name, origin); |
416 | strlcat(state->pp_buf, tmp, PAGE_SIZE); | |
1da177e4 LT |
417 | 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++, | |
3fbf586c | 423 | start_sect(p), nr_sects(p)); |
1da177e4 | 424 | } |
9c867fbe | 425 | strlcat(state->pp_buf, " >\n", PAGE_SIZE); |
1da177e4 LT |
426 | } |
427 | put_dev_sector(sect); | |
428 | #endif /* CONFIG_MINIX_SUBPARTITION */ | |
429 | } | |
430 | ||
431 | static struct { | |
432 | unsigned char id; | |
1493bf21 | 433 | void (*parse)(struct parsed_partitions *, sector_t, sector_t, int); |
1da177e4 LT |
434 | } 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 | ||
1493bf21 | 445 | int msdos_partition(struct parsed_partitions *state) |
1da177e4 | 446 | { |
1493bf21 | 447 | sector_t sector_size = bdev_logical_block_size(state->bdev) / 512; |
1da177e4 LT |
448 | Sector sect; |
449 | unsigned char *data; | |
450 | struct partition *p; | |
0607fd02 | 451 | struct fat_boot_sector *fb; |
1da177e4 | 452 | int slot; |
d33b98fc | 453 | u32 disksig; |
1da177e4 | 454 | |
1493bf21 | 455 | data = read_part_sector(state, 0, §); |
1da177e4 LT |
456 | if (!data) |
457 | return -1; | |
86ee8ba6 PDM |
458 | |
459 | /* | |
460 | * Note order! (some AIX disks, e.g. unbootable kind, | |
461 | * have no MSDOS 55aa) | |
462 | */ | |
463 | if (aix_magic_present(state, data)) { | |
1da177e4 | 464 | put_dev_sector(sect); |
86ee8ba6 | 465 | strlcat(state->pp_buf, " [AIX]", PAGE_SIZE); |
1da177e4 LT |
466 | return 0; |
467 | } | |
468 | ||
86ee8ba6 | 469 | if (!msdos_magic_present(data + 510)) { |
e1dfa92d | 470 | put_dev_sector(sect); |
e1dfa92d OH |
471 | return 0; |
472 | } | |
473 | ||
1da177e4 LT |
474 | /* |
475 | * Now that the 55aa signature is present, this is probably | |
476 | * either the boot sector of a FAT filesystem or a DOS-type | |
477 | * partition table. Reject this in case the boot indicator | |
478 | * is not 0 or 0x80. | |
479 | */ | |
480 | p = (struct partition *) (data + 0x1be); | |
481 | for (slot = 1; slot <= 4; slot++, p++) { | |
482 | if (p->boot_ind != 0 && p->boot_ind != 0x80) { | |
0607fd02 FS |
483 | /* |
484 | * Even without a valid boot inidicator value | |
485 | * its still possible this is valid FAT filesystem | |
486 | * without a partition table. | |
487 | */ | |
488 | fb = (struct fat_boot_sector *) data; | |
489 | if (slot == 1 && fb->reserved && fb->fats | |
490 | && fat_valid_media(fb->media)) { | |
9c867fbe | 491 | strlcat(state->pp_buf, "\n", PAGE_SIZE); |
0607fd02 FS |
492 | put_dev_sector(sect); |
493 | return 1; | |
494 | } else { | |
495 | put_dev_sector(sect); | |
496 | return 0; | |
497 | } | |
1da177e4 LT |
498 | } |
499 | } | |
500 | ||
501 | #ifdef CONFIG_EFI_PARTITION | |
502 | p = (struct partition *) (data + 0x1be); | |
503 | for (slot = 1 ; slot <= 4 ; slot++, p++) { | |
504 | /* If this is an EFI GPT disk, msdos should ignore it. */ | |
505 | if (SYS_IND(p) == EFI_PMBR_OSTYPE_EFI_GPT) { | |
506 | put_dev_sector(sect); | |
507 | return 0; | |
508 | } | |
509 | } | |
510 | #endif | |
511 | p = (struct partition *) (data + 0x1be); | |
512 | ||
d33b98fc SW |
513 | disksig = le32_to_cpup((__le32 *)(data + 0x1b8)); |
514 | ||
1da177e4 LT |
515 | /* |
516 | * Look for partitions in two passes: | |
517 | * First find the primary and DOS-type extended partitions. | |
518 | * On the second pass look inside *BSD, Unixware and Solaris partitions. | |
519 | */ | |
520 | ||
521 | state->next = 5; | |
522 | for (slot = 1 ; slot <= 4 ; slot++, p++) { | |
3fbf586c DT |
523 | sector_t start = start_sect(p)*sector_size; |
524 | sector_t size = nr_sects(p)*sector_size; | |
1da177e4 LT |
525 | if (!size) |
526 | continue; | |
527 | if (is_extended_partition(p)) { | |
8e0cc811 OH |
528 | /* |
529 | * prevent someone doing mkfs or mkswap on an | |
530 | * extended partition, but leave room for LILO | |
531 | * FIXME: this uses one logical sector for > 512b | |
532 | * sector, although it may not be enough/proper. | |
533 | */ | |
534 | sector_t n = 2; | |
535 | n = min(size, max(sector_size, n)); | |
536 | put_partition(state, slot, start, n); | |
537 | ||
9c867fbe | 538 | strlcat(state->pp_buf, " <", PAGE_SIZE); |
d33b98fc | 539 | parse_extended(state, start, size, disksig); |
9c867fbe | 540 | strlcat(state->pp_buf, " >", PAGE_SIZE); |
1da177e4 LT |
541 | continue; |
542 | } | |
543 | put_partition(state, slot, start, size); | |
d33b98fc | 544 | set_info(state, slot, disksig); |
1da177e4 | 545 | if (SYS_IND(p) == LINUX_RAID_PARTITION) |
cc910624 | 546 | state->parts[slot].flags = ADDPART_FLAG_RAID; |
1da177e4 | 547 | if (SYS_IND(p) == DM6_PARTITION) |
9c867fbe | 548 | strlcat(state->pp_buf, "[DM]", PAGE_SIZE); |
1da177e4 | 549 | if (SYS_IND(p) == EZD_PARTITION) |
9c867fbe | 550 | strlcat(state->pp_buf, "[EZD]", PAGE_SIZE); |
1da177e4 LT |
551 | } |
552 | ||
9c867fbe | 553 | strlcat(state->pp_buf, "\n", PAGE_SIZE); |
1da177e4 LT |
554 | |
555 | /* second pass - output for each on a separate line */ | |
556 | p = (struct partition *) (0x1be + data); | |
557 | for (slot = 1 ; slot <= 4 ; slot++, p++) { | |
558 | unsigned char id = SYS_IND(p); | |
559 | int n; | |
560 | ||
3fbf586c | 561 | if (!nr_sects(p)) |
1da177e4 LT |
562 | continue; |
563 | ||
564 | for (n = 0; subtypes[n].parse && id != subtypes[n].id; n++) | |
565 | ; | |
566 | ||
567 | if (!subtypes[n].parse) | |
568 | continue; | |
1493bf21 TH |
569 | subtypes[n].parse(state, start_sect(p) * sector_size, |
570 | nr_sects(p) * sector_size, slot); | |
1da177e4 LT |
571 | } |
572 | put_dev_sector(sect); | |
573 | return 1; | |
574 | } |