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);
111 static struct g_part_mbr_alias {
114 } mbr_alias_match[] = {
115 { DOSPTYP_386BSD, G_PART_ALIAS_FREEBSD },
116 { DOSPTYP_EXT, G_PART_ALIAS_EBR },
117 { DOSPTYP_NTFS, G_PART_ALIAS_MS_NTFS },
118 { DOSPTYP_FAT32, G_PART_ALIAS_MS_FAT32 },
119 { DOSPTYP_LINSWP, G_PART_ALIAS_LINUX_SWAP },
120 { DOSPTYP_LINUX, G_PART_ALIAS_LINUX_DATA },
121 { DOSPTYP_LINLVM, G_PART_ALIAS_LINUX_LVM },
122 { DOSPTYP_LINRAID, G_PART_ALIAS_LINUX_RAID },
126 mbr_parse_type(const char *type, u_char *dp_typ)
133 if (type[0] == '!') {
134 lt = strtol(type + 1, &endp, 0);
135 if (type[1] == '\0' || *endp != '\0' || lt <= 0 || lt >= 256)
137 *dp_typ = (u_char)lt;
141 i < sizeof(mbr_alias_match) / sizeof(mbr_alias_match[0]); i++) {
142 alias = g_part_alias_name(mbr_alias_match[i].alias);
143 if (strcasecmp(type, alias) == 0) {
144 *dp_typ = mbr_alias_match[i].typ;
152 mbr_probe_bpb(u_char *bpb)
157 #define PO2(x) ((x & (x - 1)) == 0)
158 secsz = le16dec(bpb);
159 if (secsz < 512 || secsz > 4096 || !PO2(secsz))
162 if (clstsz < 1 || clstsz > 128 || !PO2(clstsz))
170 mbr_set_chs(struct g_part_table *table, uint32_t lba, u_char *cylp, u_char *hdp,
173 uint32_t cyl, hd, sec;
175 sec = lba % table->gpt_sectors + 1;
176 lba /= table->gpt_sectors;
177 hd = lba % table->gpt_heads;
178 lba /= table->gpt_heads;
185 *secp = (sec & 0x3f) | ((cyl >> 2) & 0xc0);
189 g_part_mbr_add(struct g_part_table *basetable, struct g_part_entry *baseentry,
190 struct g_part_parms *gpp)
192 struct g_part_mbr_entry *entry;
193 struct g_part_mbr_table *table;
194 uint32_t start, size, sectors;
196 if (gpp->gpp_parms & G_PART_PARM_LABEL)
199 sectors = basetable->gpt_sectors;
201 entry = (struct g_part_mbr_entry *)baseentry;
202 table = (struct g_part_mbr_table *)basetable;
204 start = gpp->gpp_start;
205 size = gpp->gpp_size;
208 if (start % sectors) {
209 size = size - sectors + (start % sectors);
210 start = start - (start % sectors) + sectors;
213 size = size - (size % sectors);
217 if (baseentry->gpe_deleted)
218 bzero(&entry->ent, sizeof(entry->ent));
220 KASSERT(baseentry->gpe_start <= start, (__func__));
221 KASSERT(baseentry->gpe_end >= start + size - 1, (__func__));
222 baseentry->gpe_start = start;
223 baseentry->gpe_end = start + size - 1;
224 entry->ent.dp_start = start;
225 entry->ent.dp_size = size;
226 mbr_set_chs(basetable, baseentry->gpe_start, &entry->ent.dp_scyl,
227 &entry->ent.dp_shd, &entry->ent.dp_ssect);
228 mbr_set_chs(basetable, baseentry->gpe_end, &entry->ent.dp_ecyl,
229 &entry->ent.dp_ehd, &entry->ent.dp_esect);
230 return (mbr_parse_type(gpp->gpp_type, &entry->ent.dp_typ));
234 g_part_mbr_bootcode(struct g_part_table *basetable, struct g_part_parms *gpp)
236 struct g_part_mbr_table *table;
239 if (gpp->gpp_codesize != MBRSIZE)
242 table = (struct g_part_mbr_table *)basetable;
243 dsn = *(uint32_t *)(table->mbr + DOSDSNOFF);
244 bcopy(gpp->gpp_codeptr, table->mbr, DOSPARTOFF);
246 *(uint32_t *)(table->mbr + DOSDSNOFF) = dsn;
251 g_part_mbr_create(struct g_part_table *basetable, struct g_part_parms *gpp)
253 struct g_provider *pp;
254 struct g_part_mbr_table *table;
256 pp = gpp->gpp_provider;
257 if (pp->sectorsize < MBRSIZE)
260 basetable->gpt_first = basetable->gpt_sectors;
261 basetable->gpt_last = MIN(pp->mediasize / pp->sectorsize,
264 table = (struct g_part_mbr_table *)basetable;
265 le16enc(table->mbr + DOSMAGICOFFSET, DOSMAGIC);
270 g_part_mbr_destroy(struct g_part_table *basetable, struct g_part_parms *gpp)
273 /* Wipe the first sector to clear the partitioning. */
274 basetable->gpt_smhead |= 1;
279 g_part_mbr_dumpconf(struct g_part_table *table, struct g_part_entry *baseentry,
280 struct sbuf *sb, const char *indent)
282 struct g_part_mbr_entry *entry;
284 entry = (struct g_part_mbr_entry *)baseentry;
285 if (indent == NULL) {
286 /* conftxt: libdisk compatibility */
287 sbuf_printf(sb, " xs MBR xt %u", entry->ent.dp_typ);
288 } else if (entry != NULL) {
289 /* confxml: partition entry information */
290 sbuf_printf(sb, "%s<rawtype>%u</rawtype>\n", indent,
292 if (entry->ent.dp_flag & 0x80)
293 sbuf_printf(sb, "%s<attrib>active</attrib>\n", indent);
295 /* confxml: scheme information */
300 g_part_mbr_dumpto(struct g_part_table *table, struct g_part_entry *baseentry)
302 struct g_part_mbr_entry *entry;
304 /* Allow dumping to a FreeBSD partition or Linux swap partition only. */
305 entry = (struct g_part_mbr_entry *)baseentry;
306 return ((entry->ent.dp_typ == DOSPTYP_386BSD ||
307 entry->ent.dp_typ == DOSPTYP_LINSWP) ? 1 : 0);
311 g_part_mbr_modify(struct g_part_table *basetable,
312 struct g_part_entry *baseentry, struct g_part_parms *gpp)
314 struct g_part_mbr_entry *entry;
316 if (gpp->gpp_parms & G_PART_PARM_LABEL)
319 entry = (struct g_part_mbr_entry *)baseentry;
320 if (gpp->gpp_parms & G_PART_PARM_TYPE)
321 return (mbr_parse_type(gpp->gpp_type, &entry->ent.dp_typ));
326 g_part_mbr_resize(struct g_part_table *basetable,
327 struct g_part_entry *baseentry, struct g_part_parms *gpp)
329 struct g_part_mbr_entry *entry;
330 uint32_t size, sectors;
332 sectors = basetable->gpt_sectors;
333 size = gpp->gpp_size;
338 size = size - (size % sectors);
342 entry = (struct g_part_mbr_entry *)baseentry;
343 baseentry->gpe_end = baseentry->gpe_start + size - 1;
344 entry->ent.dp_size = size;
345 mbr_set_chs(basetable, baseentry->gpe_end, &entry->ent.dp_ecyl,
346 &entry->ent.dp_ehd, &entry->ent.dp_esect);
351 g_part_mbr_name(struct g_part_table *table, struct g_part_entry *baseentry,
352 char *buf, size_t bufsz)
355 snprintf(buf, bufsz, "s%d", baseentry->gpe_index);
360 g_part_mbr_probe(struct g_part_table *table, struct g_consumer *cp)
363 struct g_provider *pp;
365 int error, index, res, sum;
370 /* Sanity-check the provider. */
371 if (pp->sectorsize < MBRSIZE || pp->mediasize < pp->sectorsize)
373 if (pp->sectorsize > 4096)
376 /* We don't nest under an MBR (see EBR instead). */
377 error = g_getattr("PART::scheme", cp, &psn);
378 if (error == 0 && strcmp(psn, g_part_mbr_scheme.name) == 0)
381 /* Check that there's a MBR. */
382 buf = g_read_data(cp, 0L, pp->sectorsize, &error);
386 /* We goto out on mismatch. */
389 magic = le16dec(buf + DOSMAGICOFFSET);
390 if (magic != DOSMAGIC)
393 for (index = 0; index < NDOSPART; index++) {
394 p = buf + DOSPARTOFF + index * DOSPARTSIZE;
395 if (p[0] != 0 && p[0] != 0x80)
400 * If the partition table does not consist of all zeroes,
401 * assume we have a MBR. If it's all zeroes, we could have
402 * a boot sector. For example, a boot sector that doesn't
403 * have boot code -- common on non-i386 hardware. In that
404 * case we check if we have a possible BPB. If so, then we
405 * assume we have a boot sector instead.
408 for (index = 0; index < NDOSPART * DOSPARTSIZE; index++)
409 sum += buf[DOSPARTOFF + index];
410 if (sum != 0 || !mbr_probe_bpb(buf + 0x0b))
411 res = G_PART_PROBE_PRI_NORM;
419 g_part_mbr_read(struct g_part_table *basetable, struct g_consumer *cp)
421 struct dos_partition ent;
422 struct g_provider *pp;
423 struct g_part_mbr_table *table;
424 struct g_part_mbr_entry *entry;
426 off_t chs, msize, first;
427 u_int sectors, heads;
431 table = (struct g_part_mbr_table *)basetable;
432 first = basetable->gpt_sectors;
433 msize = MIN(pp->mediasize / pp->sectorsize, UINT32_MAX);
435 buf = g_read_data(cp, 0L, pp->sectorsize, &error);
439 bcopy(buf, table->mbr, sizeof(table->mbr));
440 for (index = NDOSPART - 1; index >= 0; index--) {
441 p = buf + DOSPARTOFF + index * DOSPARTSIZE;
450 ent.dp_start = le32dec(p + 8);
451 ent.dp_size = le32dec(p + 12);
452 if (ent.dp_typ == 0 || ent.dp_typ == DOSPTYP_PMBR)
454 if (ent.dp_start == 0 || ent.dp_size == 0)
456 sectors = ent.dp_esect & 0x3f;
457 if (sectors > basetable->gpt_sectors &&
458 !basetable->gpt_fixgeom) {
459 g_part_geometry_heads(msize, sectors, &chs, &heads);
461 basetable->gpt_sectors = sectors;
462 basetable->gpt_heads = heads;
465 if (ent.dp_start < first)
466 first = ent.dp_start;
467 entry = (struct g_part_mbr_entry *)g_part_new_entry(basetable,
468 index + 1, ent.dp_start, ent.dp_start + ent.dp_size - 1);
472 basetable->gpt_entries = NDOSPART;
473 basetable->gpt_first = basetable->gpt_sectors;
474 basetable->gpt_last = msize - 1;
476 if (first < basetable->gpt_first)
477 basetable->gpt_first = 1;
484 g_part_mbr_setunset(struct g_part_table *table, struct g_part_entry *baseentry,
485 const char *attrib, unsigned int set)
487 struct g_part_entry *iter;
488 struct g_part_mbr_entry *entry;
491 if (strcasecmp(attrib, "active") != 0)
494 /* Only one entry can have the active attribute. */
495 LIST_FOREACH(iter, &table->gpt_entry, gpe_entry) {
496 if (iter->gpe_deleted)
499 entry = (struct g_part_mbr_entry *)iter;
500 if (iter == baseentry) {
501 if (set && (entry->ent.dp_flag & 0x80) == 0) {
502 entry->ent.dp_flag |= 0x80;
504 } else if (!set && (entry->ent.dp_flag & 0x80)) {
505 entry->ent.dp_flag &= ~0x80;
509 if (set && (entry->ent.dp_flag & 0x80)) {
510 entry->ent.dp_flag &= ~0x80;
514 if (changed && !iter->gpe_created)
515 iter->gpe_modified = 1;
521 g_part_mbr_type(struct g_part_table *basetable, struct g_part_entry *baseentry,
522 char *buf, size_t bufsz)
524 struct g_part_mbr_entry *entry;
527 entry = (struct g_part_mbr_entry *)baseentry;
529 i < sizeof(mbr_alias_match) / sizeof(mbr_alias_match[0]); i++) {
530 if (mbr_alias_match[i].typ == entry->ent.dp_typ)
531 return (g_part_alias_name(mbr_alias_match[i].alias));
533 snprintf(buf, bufsz, "!%d", entry->ent.dp_typ);
538 g_part_mbr_write(struct g_part_table *basetable, struct g_consumer *cp)
540 struct g_part_entry *baseentry;
541 struct g_part_mbr_entry *entry;
542 struct g_part_mbr_table *table;
546 table = (struct g_part_mbr_table *)basetable;
547 baseentry = LIST_FIRST(&basetable->gpt_entry);
548 for (index = 1; index <= basetable->gpt_entries; index++) {
549 p = table->mbr + DOSPARTOFF + (index - 1) * DOSPARTSIZE;
550 entry = (baseentry != NULL && index == baseentry->gpe_index)
551 ? (struct g_part_mbr_entry *)baseentry : NULL;
552 if (entry != NULL && !baseentry->gpe_deleted) {
553 p[0] = entry->ent.dp_flag;
554 p[1] = entry->ent.dp_shd;
555 p[2] = entry->ent.dp_ssect;
556 p[3] = entry->ent.dp_scyl;
557 p[4] = entry->ent.dp_typ;
558 p[5] = entry->ent.dp_ehd;
559 p[6] = entry->ent.dp_esect;
560 p[7] = entry->ent.dp_ecyl;
561 le32enc(p + 8, entry->ent.dp_start);
562 le32enc(p + 12, entry->ent.dp_size);
564 bzero(p, DOSPARTSIZE);
567 baseentry = LIST_NEXT(baseentry, gpe_entry);
570 error = g_write_data(cp, 0, table->mbr, cp->provider->sectorsize);