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 <sys/sysctl.h>
44 #include <geom/geom.h>
45 #include <geom/geom_int.h>
46 #include <geom/part/g_part.h>
48 #include "g_part_if.h"
50 FEATURE(geom_part_mbr, "GEOM partitioning class for MBR support");
54 struct g_part_mbr_table {
55 struct g_part_table base;
59 struct g_part_mbr_entry {
60 struct g_part_entry base;
61 struct dos_partition ent;
64 static int g_part_mbr_add(struct g_part_table *, struct g_part_entry *,
65 struct g_part_parms *);
66 static int g_part_mbr_bootcode(struct g_part_table *, struct g_part_parms *);
67 static int g_part_mbr_create(struct g_part_table *, struct g_part_parms *);
68 static int g_part_mbr_destroy(struct g_part_table *, struct g_part_parms *);
69 static void g_part_mbr_dumpconf(struct g_part_table *, struct g_part_entry *,
70 struct sbuf *, const char *);
71 static int g_part_mbr_dumpto(struct g_part_table *, struct g_part_entry *);
72 static int g_part_mbr_modify(struct g_part_table *, struct g_part_entry *,
73 struct g_part_parms *);
74 static const char *g_part_mbr_name(struct g_part_table *, struct g_part_entry *,
76 static int g_part_mbr_probe(struct g_part_table *, struct g_consumer *);
77 static int g_part_mbr_read(struct g_part_table *, struct g_consumer *);
78 static int g_part_mbr_setunset(struct g_part_table *, struct g_part_entry *,
79 const char *, unsigned int);
80 static const char *g_part_mbr_type(struct g_part_table *, struct g_part_entry *,
82 static int g_part_mbr_write(struct g_part_table *, struct g_consumer *);
83 static int g_part_mbr_resize(struct g_part_table *, struct g_part_entry *,
84 struct g_part_parms *);
86 static kobj_method_t g_part_mbr_methods[] = {
87 KOBJMETHOD(g_part_add, g_part_mbr_add),
88 KOBJMETHOD(g_part_bootcode, g_part_mbr_bootcode),
89 KOBJMETHOD(g_part_create, g_part_mbr_create),
90 KOBJMETHOD(g_part_destroy, g_part_mbr_destroy),
91 KOBJMETHOD(g_part_dumpconf, g_part_mbr_dumpconf),
92 KOBJMETHOD(g_part_dumpto, g_part_mbr_dumpto),
93 KOBJMETHOD(g_part_modify, g_part_mbr_modify),
94 KOBJMETHOD(g_part_resize, g_part_mbr_resize),
95 KOBJMETHOD(g_part_name, g_part_mbr_name),
96 KOBJMETHOD(g_part_probe, g_part_mbr_probe),
97 KOBJMETHOD(g_part_read, g_part_mbr_read),
98 KOBJMETHOD(g_part_setunset, g_part_mbr_setunset),
99 KOBJMETHOD(g_part_type, g_part_mbr_type),
100 KOBJMETHOD(g_part_write, g_part_mbr_write),
104 static struct g_part_scheme g_part_mbr_scheme = {
107 sizeof(struct g_part_mbr_table),
108 .gps_entrysz = sizeof(struct g_part_mbr_entry),
109 .gps_minent = NDOSPART,
110 .gps_maxent = NDOSPART,
111 .gps_bootcodesz = MBRSIZE,
113 G_PART_SCHEME_DECLARE(g_part_mbr);
115 static struct g_part_mbr_alias {
118 } mbr_alias_match[] = {
119 { DOSPTYP_386BSD, G_PART_ALIAS_FREEBSD },
120 { DOSPTYP_EXT, G_PART_ALIAS_EBR },
121 { DOSPTYP_NTFS, G_PART_ALIAS_MS_NTFS },
122 { DOSPTYP_FAT16, G_PART_ALIAS_MS_FAT16 },
123 { DOSPTYP_FAT32, G_PART_ALIAS_MS_FAT32 },
124 { DOSPTYP_EXTLBA, G_PART_ALIAS_EBR },
125 { DOSPTYP_LDM, G_PART_ALIAS_MS_LDM_DATA },
126 { DOSPTYP_LINSWP, G_PART_ALIAS_LINUX_SWAP },
127 { DOSPTYP_LINUX, G_PART_ALIAS_LINUX_DATA },
128 { DOSPTYP_LINLVM, G_PART_ALIAS_LINUX_LVM },
129 { DOSPTYP_LINRAID, G_PART_ALIAS_LINUX_RAID },
130 { DOSPTYP_VMFS, G_PART_ALIAS_VMFS },
131 { DOSPTYP_VMKDIAG, G_PART_ALIAS_VMKDIAG },
135 mbr_parse_type(const char *type, u_char *dp_typ)
142 if (type[0] == '!') {
143 lt = strtol(type + 1, &endp, 0);
144 if (type[1] == '\0' || *endp != '\0' || lt <= 0 || lt >= 256)
146 *dp_typ = (u_char)lt;
150 i < sizeof(mbr_alias_match) / sizeof(mbr_alias_match[0]); i++) {
151 alias = g_part_alias_name(mbr_alias_match[i].alias);
152 if (strcasecmp(type, alias) == 0) {
153 *dp_typ = mbr_alias_match[i].typ;
161 mbr_probe_bpb(u_char *bpb)
166 #define PO2(x) ((x & (x - 1)) == 0)
167 secsz = le16dec(bpb);
168 if (secsz < 512 || secsz > 4096 || !PO2(secsz))
171 if (clstsz < 1 || clstsz > 128 || !PO2(clstsz))
179 mbr_set_chs(struct g_part_table *table, uint32_t lba, u_char *cylp, u_char *hdp,
182 uint32_t cyl, hd, sec;
184 sec = lba % table->gpt_sectors + 1;
185 lba /= table->gpt_sectors;
186 hd = lba % table->gpt_heads;
187 lba /= table->gpt_heads;
194 *secp = (sec & 0x3f) | ((cyl >> 2) & 0xc0);
198 mbr_align(struct g_part_table *basetable, uint32_t *start, uint32_t *size)
202 sectors = basetable->gpt_sectors;
205 if (start != NULL && (*start % sectors)) {
206 *size += (*start % sectors) - sectors;
207 *start -= (*start % sectors) - sectors;
210 *size -= (*size % sectors);
217 g_part_mbr_add(struct g_part_table *basetable, struct g_part_entry *baseentry,
218 struct g_part_parms *gpp)
220 struct g_part_mbr_entry *entry;
221 uint32_t start, size;
223 if (gpp->gpp_parms & G_PART_PARM_LABEL)
226 entry = (struct g_part_mbr_entry *)baseentry;
227 start = gpp->gpp_start;
228 size = gpp->gpp_size;
229 if (mbr_align(basetable, &start, &size) != 0)
231 if (baseentry->gpe_deleted)
232 bzero(&entry->ent, sizeof(entry->ent));
234 KASSERT(baseentry->gpe_start <= start, ("%s", __func__));
235 KASSERT(baseentry->gpe_end >= start + size - 1, ("%s", __func__));
236 baseentry->gpe_start = start;
237 baseentry->gpe_end = start + size - 1;
238 entry->ent.dp_start = start;
239 entry->ent.dp_size = size;
240 mbr_set_chs(basetable, baseentry->gpe_start, &entry->ent.dp_scyl,
241 &entry->ent.dp_shd, &entry->ent.dp_ssect);
242 mbr_set_chs(basetable, baseentry->gpe_end, &entry->ent.dp_ecyl,
243 &entry->ent.dp_ehd, &entry->ent.dp_esect);
244 return (mbr_parse_type(gpp->gpp_type, &entry->ent.dp_typ));
248 g_part_mbr_bootcode(struct g_part_table *basetable, struct g_part_parms *gpp)
250 struct g_part_mbr_table *table;
253 if (gpp->gpp_codesize != MBRSIZE)
256 table = (struct g_part_mbr_table *)basetable;
257 dsn = *(uint32_t *)(table->mbr + DOSDSNOFF);
258 bcopy(gpp->gpp_codeptr, table->mbr, DOSPARTOFF);
260 *(uint32_t *)(table->mbr + DOSDSNOFF) = dsn;
265 g_part_mbr_create(struct g_part_table *basetable, struct g_part_parms *gpp)
267 struct g_provider *pp;
268 struct g_part_mbr_table *table;
270 pp = gpp->gpp_provider;
271 if (pp->sectorsize < MBRSIZE)
274 basetable->gpt_first = basetable->gpt_sectors;
275 basetable->gpt_last = MIN(pp->mediasize / pp->sectorsize,
278 table = (struct g_part_mbr_table *)basetable;
279 le16enc(table->mbr + DOSMAGICOFFSET, DOSMAGIC);
284 g_part_mbr_destroy(struct g_part_table *basetable, struct g_part_parms *gpp)
287 /* Wipe the first sector to clear the partitioning. */
288 basetable->gpt_smhead |= 1;
293 g_part_mbr_dumpconf(struct g_part_table *table, struct g_part_entry *baseentry,
294 struct sbuf *sb, const char *indent)
296 struct g_part_mbr_entry *entry;
298 entry = (struct g_part_mbr_entry *)baseentry;
299 if (indent == NULL) {
300 /* conftxt: libdisk compatibility */
301 sbuf_printf(sb, " xs MBR xt %u", entry->ent.dp_typ);
302 } else if (entry != NULL) {
303 /* confxml: partition entry information */
304 sbuf_printf(sb, "%s<rawtype>%u</rawtype>\n", indent,
306 if (entry->ent.dp_flag & 0x80)
307 sbuf_printf(sb, "%s<attrib>active</attrib>\n", indent);
309 /* confxml: scheme information */
314 g_part_mbr_dumpto(struct g_part_table *table, struct g_part_entry *baseentry)
316 struct g_part_mbr_entry *entry;
318 /* Allow dumping to a FreeBSD partition or Linux swap partition only. */
319 entry = (struct g_part_mbr_entry *)baseentry;
320 return ((entry->ent.dp_typ == DOSPTYP_386BSD ||
321 entry->ent.dp_typ == DOSPTYP_LINSWP) ? 1 : 0);
325 g_part_mbr_modify(struct g_part_table *basetable,
326 struct g_part_entry *baseentry, struct g_part_parms *gpp)
328 struct g_part_mbr_entry *entry;
330 if (gpp->gpp_parms & G_PART_PARM_LABEL)
333 entry = (struct g_part_mbr_entry *)baseentry;
334 if (gpp->gpp_parms & G_PART_PARM_TYPE)
335 return (mbr_parse_type(gpp->gpp_type, &entry->ent.dp_typ));
340 g_part_mbr_resize(struct g_part_table *basetable,
341 struct g_part_entry *baseentry, struct g_part_parms *gpp)
343 struct g_part_mbr_entry *entry;
344 struct g_provider *pp;
347 size = gpp->gpp_size;
348 if (mbr_align(basetable, NULL, &size) != 0)
350 /* XXX: prevent unexpected shrinking. */
351 pp = baseentry->gpe_pp;
352 if ((g_debugflags & 0x10) == 0 && size < gpp->gpp_size &&
353 pp->mediasize / pp->sectorsize > size)
355 entry = (struct g_part_mbr_entry *)baseentry;
356 baseentry->gpe_end = baseentry->gpe_start + size - 1;
357 entry->ent.dp_size = size;
358 mbr_set_chs(basetable, baseentry->gpe_end, &entry->ent.dp_ecyl,
359 &entry->ent.dp_ehd, &entry->ent.dp_esect);
364 g_part_mbr_name(struct g_part_table *table, struct g_part_entry *baseentry,
365 char *buf, size_t bufsz)
368 snprintf(buf, bufsz, "s%d", baseentry->gpe_index);
373 g_part_mbr_probe(struct g_part_table *table, struct g_consumer *cp)
376 struct g_provider *pp;
378 int error, index, res, sum;
383 /* Sanity-check the provider. */
384 if (pp->sectorsize < MBRSIZE || pp->mediasize < pp->sectorsize)
386 if (pp->sectorsize > 4096)
389 /* We don't nest under an MBR (see EBR instead). */
390 error = g_getattr("PART::scheme", cp, &psn);
391 if (error == 0 && strcmp(psn, g_part_mbr_scheme.name) == 0)
394 /* Check that there's a MBR. */
395 buf = g_read_data(cp, 0L, pp->sectorsize, &error);
399 /* We goto out on mismatch. */
402 magic = le16dec(buf + DOSMAGICOFFSET);
403 if (magic != DOSMAGIC)
406 for (index = 0; index < NDOSPART; index++) {
407 p = buf + DOSPARTOFF + index * DOSPARTSIZE;
408 if (p[0] != 0 && p[0] != 0x80)
413 * If the partition table does not consist of all zeroes,
414 * assume we have a MBR. If it's all zeroes, we could have
415 * a boot sector. For example, a boot sector that doesn't
416 * have boot code -- common on non-i386 hardware. In that
417 * case we check if we have a possible BPB. If so, then we
418 * assume we have a boot sector instead.
421 for (index = 0; index < NDOSPART * DOSPARTSIZE; index++)
422 sum += buf[DOSPARTOFF + index];
423 if (sum != 0 || !mbr_probe_bpb(buf + 0x0b))
424 res = G_PART_PROBE_PRI_NORM;
432 g_part_mbr_read(struct g_part_table *basetable, struct g_consumer *cp)
434 struct dos_partition ent;
435 struct g_provider *pp;
436 struct g_part_mbr_table *table;
437 struct g_part_mbr_entry *entry;
439 off_t chs, msize, first;
440 u_int sectors, heads;
444 table = (struct g_part_mbr_table *)basetable;
445 first = basetable->gpt_sectors;
446 msize = MIN(pp->mediasize / pp->sectorsize, UINT32_MAX);
448 buf = g_read_data(cp, 0L, pp->sectorsize, &error);
452 bcopy(buf, table->mbr, sizeof(table->mbr));
453 for (index = NDOSPART - 1; index >= 0; index--) {
454 p = buf + DOSPARTOFF + index * DOSPARTSIZE;
463 ent.dp_start = le32dec(p + 8);
464 ent.dp_size = le32dec(p + 12);
465 if (ent.dp_typ == 0 || ent.dp_typ == DOSPTYP_PMBR)
467 if (ent.dp_start == 0 || ent.dp_size == 0)
469 sectors = ent.dp_esect & 0x3f;
470 if (sectors > basetable->gpt_sectors &&
471 !basetable->gpt_fixgeom) {
472 g_part_geometry_heads(msize, sectors, &chs, &heads);
474 basetable->gpt_sectors = sectors;
475 basetable->gpt_heads = heads;
478 if (ent.dp_start < first)
479 first = ent.dp_start;
480 entry = (struct g_part_mbr_entry *)g_part_new_entry(basetable,
481 index + 1, ent.dp_start, ent.dp_start + ent.dp_size - 1);
485 basetable->gpt_entries = NDOSPART;
486 basetable->gpt_first = basetable->gpt_sectors;
487 basetable->gpt_last = msize - 1;
489 if (first < basetable->gpt_first)
490 basetable->gpt_first = 1;
497 g_part_mbr_setunset(struct g_part_table *table, struct g_part_entry *baseentry,
498 const char *attrib, unsigned int set)
500 struct g_part_entry *iter;
501 struct g_part_mbr_entry *entry;
504 if (baseentry == NULL)
506 if (strcasecmp(attrib, "active") != 0)
509 /* Only one entry can have the active attribute. */
510 LIST_FOREACH(iter, &table->gpt_entry, gpe_entry) {
511 if (iter->gpe_deleted)
514 entry = (struct g_part_mbr_entry *)iter;
515 if (iter == baseentry) {
516 if (set && (entry->ent.dp_flag & 0x80) == 0) {
517 entry->ent.dp_flag |= 0x80;
519 } else if (!set && (entry->ent.dp_flag & 0x80)) {
520 entry->ent.dp_flag &= ~0x80;
524 if (set && (entry->ent.dp_flag & 0x80)) {
525 entry->ent.dp_flag &= ~0x80;
529 if (changed && !iter->gpe_created)
530 iter->gpe_modified = 1;
536 g_part_mbr_type(struct g_part_table *basetable, struct g_part_entry *baseentry,
537 char *buf, size_t bufsz)
539 struct g_part_mbr_entry *entry;
542 entry = (struct g_part_mbr_entry *)baseentry;
544 i < sizeof(mbr_alias_match) / sizeof(mbr_alias_match[0]); i++) {
545 if (mbr_alias_match[i].typ == entry->ent.dp_typ)
546 return (g_part_alias_name(mbr_alias_match[i].alias));
548 snprintf(buf, bufsz, "!%d", entry->ent.dp_typ);
553 g_part_mbr_write(struct g_part_table *basetable, struct g_consumer *cp)
555 struct g_part_entry *baseentry;
556 struct g_part_mbr_entry *entry;
557 struct g_part_mbr_table *table;
561 table = (struct g_part_mbr_table *)basetable;
562 baseentry = LIST_FIRST(&basetable->gpt_entry);
563 for (index = 1; index <= basetable->gpt_entries; index++) {
564 p = table->mbr + DOSPARTOFF + (index - 1) * DOSPARTSIZE;
565 entry = (baseentry != NULL && index == baseentry->gpe_index)
566 ? (struct g_part_mbr_entry *)baseentry : NULL;
567 if (entry != NULL && !baseentry->gpe_deleted) {
568 p[0] = entry->ent.dp_flag;
569 p[1] = entry->ent.dp_shd;
570 p[2] = entry->ent.dp_ssect;
571 p[3] = entry->ent.dp_scyl;
572 p[4] = entry->ent.dp_typ;
573 p[5] = entry->ent.dp_ehd;
574 p[6] = entry->ent.dp_esect;
575 p[7] = entry->ent.dp_ecyl;
576 le32enc(p + 8, entry->ent.dp_start);
577 le32enc(p + 12, entry->ent.dp_size);
579 bzero(p, DOSPARTSIZE);
582 baseentry = LIST_NEXT(baseentry, gpe_entry);
585 error = g_write_data(cp, 0, table->mbr, cp->provider->sectorsize);