2 * Copyright (c) 2007, 2008 Marcel Moolenaar
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
30 #include <sys/param.h>
32 #include <sys/diskmbr.h>
33 #include <sys/endian.h>
34 #include <sys/kernel.h>
36 #include <sys/limits.h>
38 #include <sys/malloc.h>
39 #include <sys/mutex.h>
40 #include <sys/queue.h>
42 #include <sys/systm.h>
43 #include <geom/geom.h>
44 #include <geom/part/g_part.h>
46 #include "g_part_if.h"
50 struct g_part_mbr_table {
51 struct g_part_table base;
55 struct g_part_mbr_entry {
56 struct g_part_entry base;
57 struct dos_partition ent;
60 static int g_part_mbr_add(struct g_part_table *, struct g_part_entry *,
61 struct g_part_parms *);
62 static int g_part_mbr_bootcode(struct g_part_table *, struct g_part_parms *);
63 static int g_part_mbr_create(struct g_part_table *, struct g_part_parms *);
64 static int g_part_mbr_destroy(struct g_part_table *, struct g_part_parms *);
65 static void g_part_mbr_dumpconf(struct g_part_table *, struct g_part_entry *,
66 struct sbuf *, const char *);
67 static int g_part_mbr_dumpto(struct g_part_table *, struct g_part_entry *);
68 static int g_part_mbr_modify(struct g_part_table *, struct g_part_entry *,
69 struct g_part_parms *);
70 static const char *g_part_mbr_name(struct g_part_table *, struct g_part_entry *,
72 static int g_part_mbr_probe(struct g_part_table *, struct g_consumer *);
73 static int g_part_mbr_read(struct g_part_table *, struct g_consumer *);
74 static int g_part_mbr_setunset(struct g_part_table *, struct g_part_entry *,
75 const char *, unsigned int);
76 static const char *g_part_mbr_type(struct g_part_table *, struct g_part_entry *,
78 static int g_part_mbr_write(struct g_part_table *, struct g_consumer *);
79 static int g_part_mbr_resize(struct g_part_table *, struct g_part_entry *,
80 struct g_part_parms *);
82 static kobj_method_t g_part_mbr_methods[] = {
83 KOBJMETHOD(g_part_add, g_part_mbr_add),
84 KOBJMETHOD(g_part_bootcode, g_part_mbr_bootcode),
85 KOBJMETHOD(g_part_create, g_part_mbr_create),
86 KOBJMETHOD(g_part_destroy, g_part_mbr_destroy),
87 KOBJMETHOD(g_part_dumpconf, g_part_mbr_dumpconf),
88 KOBJMETHOD(g_part_dumpto, g_part_mbr_dumpto),
89 KOBJMETHOD(g_part_modify, g_part_mbr_modify),
90 KOBJMETHOD(g_part_resize, g_part_mbr_resize),
91 KOBJMETHOD(g_part_name, g_part_mbr_name),
92 KOBJMETHOD(g_part_probe, g_part_mbr_probe),
93 KOBJMETHOD(g_part_read, g_part_mbr_read),
94 KOBJMETHOD(g_part_setunset, g_part_mbr_setunset),
95 KOBJMETHOD(g_part_type, g_part_mbr_type),
96 KOBJMETHOD(g_part_write, g_part_mbr_write),
100 static struct g_part_scheme g_part_mbr_scheme = {
103 sizeof(struct g_part_mbr_table),
104 .gps_entrysz = sizeof(struct g_part_mbr_entry),
105 .gps_minent = NDOSPART,
106 .gps_maxent = NDOSPART,
107 .gps_bootcodesz = MBRSIZE,
109 G_PART_SCHEME_DECLARE(g_part_mbr);
112 mbr_parse_type(const char *type, u_char *dp_typ)
118 if (type[0] == '!') {
119 lt = strtol(type + 1, &endp, 0);
120 if (type[1] == '\0' || *endp != '\0' || lt <= 0 || lt >= 256)
122 *dp_typ = (u_char)lt;
125 alias = g_part_alias_name(G_PART_ALIAS_FREEBSD);
126 if (!strcasecmp(type, alias)) {
127 *dp_typ = DOSPTYP_386BSD;
130 alias = g_part_alias_name(G_PART_ALIAS_MS_NTFS);
131 if (!strcasecmp(type, alias)) {
132 *dp_typ = DOSPTYP_NTFS;
139 mbr_probe_bpb(u_char *bpb)
144 #define PO2(x) ((x & (x - 1)) == 0)
145 secsz = le16dec(bpb);
146 if (secsz < 512 || secsz > 4096 || !PO2(secsz))
149 if (clstsz < 1 || clstsz > 128 || !PO2(clstsz))
157 mbr_set_chs(struct g_part_table *table, uint32_t lba, u_char *cylp, u_char *hdp,
160 uint32_t cyl, hd, sec;
162 sec = lba % table->gpt_sectors + 1;
163 lba /= table->gpt_sectors;
164 hd = lba % table->gpt_heads;
165 lba /= table->gpt_heads;
172 *secp = (sec & 0x3f) | ((cyl >> 2) & 0xc0);
176 g_part_mbr_add(struct g_part_table *basetable, struct g_part_entry *baseentry,
177 struct g_part_parms *gpp)
179 struct g_part_mbr_entry *entry;
180 struct g_part_mbr_table *table;
181 uint32_t start, size, sectors;
183 if (gpp->gpp_parms & G_PART_PARM_LABEL)
186 sectors = basetable->gpt_sectors;
188 entry = (struct g_part_mbr_entry *)baseentry;
189 table = (struct g_part_mbr_table *)basetable;
191 start = gpp->gpp_start;
192 size = gpp->gpp_size;
195 if (start % sectors) {
196 size = size - sectors + (start % sectors);
197 start = start - (start % sectors) + sectors;
200 size = size - (size % sectors);
204 if (baseentry->gpe_deleted)
205 bzero(&entry->ent, sizeof(entry->ent));
207 KASSERT(baseentry->gpe_start <= start, (__func__));
208 KASSERT(baseentry->gpe_end >= start + size - 1, (__func__));
209 baseentry->gpe_start = start;
210 baseentry->gpe_end = start + size - 1;
211 entry->ent.dp_start = start;
212 entry->ent.dp_size = size;
213 mbr_set_chs(basetable, baseentry->gpe_start, &entry->ent.dp_scyl,
214 &entry->ent.dp_shd, &entry->ent.dp_ssect);
215 mbr_set_chs(basetable, baseentry->gpe_end, &entry->ent.dp_ecyl,
216 &entry->ent.dp_ehd, &entry->ent.dp_esect);
217 return (mbr_parse_type(gpp->gpp_type, &entry->ent.dp_typ));
221 g_part_mbr_bootcode(struct g_part_table *basetable, struct g_part_parms *gpp)
223 struct g_part_mbr_table *table;
227 table = (struct g_part_mbr_table *)basetable;
228 bzero(table->mbr, codesz);
229 codesz = MIN(codesz, gpp->gpp_codesize);
231 bcopy(gpp->gpp_codeptr, table->mbr, codesz);
236 g_part_mbr_create(struct g_part_table *basetable, struct g_part_parms *gpp)
238 struct g_consumer *cp;
239 struct g_provider *pp;
240 struct g_part_mbr_table *table;
243 pp = gpp->gpp_provider;
244 cp = LIST_FIRST(&pp->consumers);
246 if (pp->sectorsize < MBRSIZE)
249 msize = MIN(pp->mediasize / pp->sectorsize, 0xffffffff);
250 basetable->gpt_first = basetable->gpt_sectors;
251 basetable->gpt_last = msize - (msize % basetable->gpt_sectors) - 1;
253 table = (struct g_part_mbr_table *)basetable;
254 le16enc(table->mbr + DOSMAGICOFFSET, DOSMAGIC);
259 g_part_mbr_destroy(struct g_part_table *basetable, struct g_part_parms *gpp)
262 /* Wipe the first sector to clear the partitioning. */
263 basetable->gpt_smhead |= 1;
268 g_part_mbr_dumpconf(struct g_part_table *table, struct g_part_entry *baseentry,
269 struct sbuf *sb, const char *indent)
271 struct g_part_mbr_entry *entry;
273 entry = (struct g_part_mbr_entry *)baseentry;
274 if (indent == NULL) {
275 /* conftxt: libdisk compatibility */
276 sbuf_printf(sb, " xs MBR xt %u", entry->ent.dp_typ);
277 } else if (entry != NULL) {
278 /* confxml: partition entry information */
279 sbuf_printf(sb, "%s<rawtype>%u</rawtype>\n", indent,
281 if (entry->ent.dp_flag & 0x80)
282 sbuf_printf(sb, "%s<attrib>active</attrib>\n", indent);
284 /* confxml: scheme information */
289 g_part_mbr_dumpto(struct g_part_table *table, struct g_part_entry *baseentry)
291 struct g_part_mbr_entry *entry;
293 /* Allow dumping to a FreeBSD partition only. */
294 entry = (struct g_part_mbr_entry *)baseentry;
295 return ((entry->ent.dp_typ == DOSPTYP_386BSD) ? 1 : 0);
299 g_part_mbr_modify(struct g_part_table *basetable,
300 struct g_part_entry *baseentry, struct g_part_parms *gpp)
302 struct g_part_mbr_entry *entry;
304 if (gpp->gpp_parms & G_PART_PARM_LABEL)
307 entry = (struct g_part_mbr_entry *)baseentry;
308 if (gpp->gpp_parms & G_PART_PARM_TYPE)
309 return (mbr_parse_type(gpp->gpp_type, &entry->ent.dp_typ));
314 g_part_mbr_resize(struct g_part_table *basetable,
315 struct g_part_entry *baseentry, struct g_part_parms *gpp)
317 struct g_part_mbr_entry *entry;
318 uint32_t size, sectors;
320 sectors = basetable->gpt_sectors;
321 size = gpp->gpp_size;
326 size = size - (size % sectors);
330 entry = (struct g_part_mbr_entry *)baseentry;
331 baseentry->gpe_end = baseentry->gpe_start + size - 1;
332 entry->ent.dp_size = size;
333 mbr_set_chs(basetable, baseentry->gpe_end, &entry->ent.dp_ecyl,
334 &entry->ent.dp_ehd, &entry->ent.dp_esect);
339 g_part_mbr_name(struct g_part_table *table, struct g_part_entry *baseentry,
340 char *buf, size_t bufsz)
343 snprintf(buf, bufsz, "s%d", baseentry->gpe_index);
348 g_part_mbr_probe(struct g_part_table *table, struct g_consumer *cp)
351 struct g_provider *pp;
353 int error, index, res, sum;
358 /* Sanity-check the provider. */
359 if (pp->sectorsize < MBRSIZE || pp->mediasize < pp->sectorsize)
361 if (pp->sectorsize > 4096)
364 /* We don't nest under an MBR (see EBR instead). */
365 error = g_getattr("PART::scheme", cp, &psn);
366 if (error == 0 && strcmp(psn, g_part_mbr_scheme.name) == 0)
369 /* Check that there's a MBR. */
370 buf = g_read_data(cp, 0L, pp->sectorsize, &error);
374 /* We goto out on mismatch. */
377 magic = le16dec(buf + DOSMAGICOFFSET);
378 if (magic != DOSMAGIC)
381 for (index = 0; index < NDOSPART; index++) {
382 p = buf + DOSPARTOFF + index * DOSPARTSIZE;
383 if (p[0] != 0 && p[0] != 0x80)
388 * If the partition table does not consist of all zeroes,
389 * assume we have a MBR. If it's all zeroes, we could have
390 * a boot sector. For example, a boot sector that doesn't
391 * have boot code -- common on non-i386 hardware. In that
392 * case we check if we have a possible BPB. If so, then we
393 * assume we have a boot sector instead.
396 for (index = 0; index < NDOSPART * DOSPARTSIZE; index++)
397 sum += buf[DOSPARTOFF + index];
398 if (sum != 0 || !mbr_probe_bpb(buf + 0x0b))
399 res = G_PART_PROBE_PRI_NORM;
407 g_part_mbr_read(struct g_part_table *basetable, struct g_consumer *cp)
409 struct dos_partition ent;
410 struct g_provider *pp;
411 struct g_part_mbr_table *table;
412 struct g_part_mbr_entry *entry;
415 u_int sectors, heads;
419 table = (struct g_part_mbr_table *)basetable;
420 msize = pp->mediasize / pp->sectorsize;
422 buf = g_read_data(cp, 0L, pp->sectorsize, &error);
426 bcopy(buf, table->mbr, sizeof(table->mbr));
427 for (index = NDOSPART - 1; index >= 0; index--) {
428 p = buf + DOSPARTOFF + index * DOSPARTSIZE;
437 ent.dp_start = le32dec(p + 8);
438 ent.dp_size = le32dec(p + 12);
439 if (ent.dp_typ == 0 || ent.dp_typ == DOSPTYP_PMBR)
441 if (ent.dp_start == 0 || ent.dp_size == 0)
443 sectors = ent.dp_esect & 0x3f;
444 if (sectors > basetable->gpt_sectors &&
445 !basetable->gpt_fixgeom) {
446 g_part_geometry_heads(msize, sectors, &chs, &heads);
448 basetable->gpt_sectors = sectors;
449 basetable->gpt_heads = heads;
452 if ((ent.dp_start % basetable->gpt_sectors) != 0)
453 printf("GEOM: %s: partition %d does not start on a "
454 "track boundary.\n", pp->name, index + 1);
455 if ((ent.dp_size % basetable->gpt_sectors) != 0)
456 printf("GEOM: %s: partition %d does not end on a "
457 "track boundary.\n", pp->name, index + 1);
459 entry = (struct g_part_mbr_entry *)g_part_new_entry(basetable,
460 index + 1, ent.dp_start, ent.dp_start + ent.dp_size - 1);
464 basetable->gpt_entries = NDOSPART;
465 basetable->gpt_first = basetable->gpt_sectors;
466 basetable->gpt_last = msize - (msize % basetable->gpt_sectors) - 1;
473 g_part_mbr_setunset(struct g_part_table *table, struct g_part_entry *baseentry,
474 const char *attrib, unsigned int set)
476 struct g_part_entry *iter;
477 struct g_part_mbr_entry *entry;
480 if (strcasecmp(attrib, "active") != 0)
483 /* Only one entry can have the active attribute. */
484 LIST_FOREACH(iter, &table->gpt_entry, gpe_entry) {
485 if (iter->gpe_deleted)
488 entry = (struct g_part_mbr_entry *)iter;
489 if (iter == baseentry) {
490 if (set && (entry->ent.dp_flag & 0x80) == 0) {
491 entry->ent.dp_flag |= 0x80;
493 } else if (!set && (entry->ent.dp_flag & 0x80)) {
494 entry->ent.dp_flag &= ~0x80;
498 if (set && (entry->ent.dp_flag & 0x80)) {
499 entry->ent.dp_flag &= ~0x80;
503 if (changed && !iter->gpe_created)
504 iter->gpe_modified = 1;
510 g_part_mbr_type(struct g_part_table *basetable, struct g_part_entry *baseentry,
511 char *buf, size_t bufsz)
513 struct g_part_mbr_entry *entry;
516 entry = (struct g_part_mbr_entry *)baseentry;
517 type = entry->ent.dp_typ;
520 return (g_part_alias_name(G_PART_ALIAS_FREEBSD));
522 return (g_part_alias_name(G_PART_ALIAS_MS_NTFS));
524 snprintf(buf, bufsz, "!%d", type);
530 g_part_mbr_write(struct g_part_table *basetable, struct g_consumer *cp)
532 struct g_part_entry *baseentry;
533 struct g_part_mbr_entry *entry;
534 struct g_part_mbr_table *table;
538 table = (struct g_part_mbr_table *)basetable;
539 baseentry = LIST_FIRST(&basetable->gpt_entry);
540 for (index = 1; index <= basetable->gpt_entries; index++) {
541 p = table->mbr + DOSPARTOFF + (index - 1) * DOSPARTSIZE;
542 entry = (baseentry != NULL && index == baseentry->gpe_index)
543 ? (struct g_part_mbr_entry *)baseentry : NULL;
544 if (entry != NULL && !baseentry->gpe_deleted) {
545 p[0] = entry->ent.dp_flag;
546 p[1] = entry->ent.dp_shd;
547 p[2] = entry->ent.dp_ssect;
548 p[3] = entry->ent.dp_scyl;
549 p[4] = entry->ent.dp_typ;
550 p[5] = entry->ent.dp_ehd;
551 p[6] = entry->ent.dp_esect;
552 p[7] = entry->ent.dp_ecyl;
553 le32enc(p + 8, entry->ent.dp_start);
554 le32enc(p + 12, entry->ent.dp_size);
556 bzero(p, DOSPARTSIZE);
559 baseentry = LIST_NEXT(baseentry, gpe_entry);
562 error = g_write_data(cp, 0, table->mbr, cp->provider->sectorsize);