1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2007, 2008 Marcel Moolenaar
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 *
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 #include <sys/param.h>
30 #include <sys/bio.h>
31 #include <sys/diskmbr.h>
32 #include <sys/endian.h>
33 #include <sys/kernel.h>
34 #include <sys/kobj.h>
35 #include <sys/limits.h>
36 #include <sys/lock.h>
37 #include <sys/malloc.h>
38 #include <sys/mutex.h>
39 #include <sys/queue.h>
40 #include <sys/sbuf.h>
41 #include <sys/systm.h>
42 #include <sys/sysctl.h>
43 #include <geom/geom.h>
44 #include <geom/geom_int.h>
45 #include <geom/part/g_part.h>
46
47 #include "g_part_if.h"
48
49 FEATURE(geom_part_mbr, "GEOM partitioning class for MBR support");
50
51 SYSCTL_DECL(_kern_geom_part);
52 static SYSCTL_NODE(_kern_geom_part, OID_AUTO, mbr,
53 CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
54 "GEOM_PART_MBR Master Boot Record");
55
56 static u_int enforce_chs = 0;
57 SYSCTL_UINT(_kern_geom_part_mbr, OID_AUTO, enforce_chs,
58 CTLFLAG_RWTUN, &enforce_chs, 0, "Enforce alignment to CHS addressing");
59
60 #define MBRSIZE 512
61
62 struct g_part_mbr_table {
63 struct g_part_table base;
64 u_char mbr[MBRSIZE];
65 };
66
67 struct g_part_mbr_entry {
68 struct g_part_entry base;
69 struct dos_partition ent;
70 };
71
72 static int g_part_mbr_add(struct g_part_table *, struct g_part_entry *,
73 struct g_part_parms *);
74 static int g_part_mbr_bootcode(struct g_part_table *, struct g_part_parms *);
75 static int g_part_mbr_create(struct g_part_table *, struct g_part_parms *);
76 static int g_part_mbr_destroy(struct g_part_table *, struct g_part_parms *);
77 static void g_part_mbr_dumpconf(struct g_part_table *, struct g_part_entry *,
78 struct sbuf *, const char *);
79 static int g_part_mbr_dumpto(struct g_part_table *, struct g_part_entry *);
80 static int g_part_mbr_modify(struct g_part_table *, struct g_part_entry *,
81 struct g_part_parms *);
82 static const char *g_part_mbr_name(struct g_part_table *, struct g_part_entry *,
83 char *, size_t);
84 static int g_part_mbr_probe(struct g_part_table *, struct g_consumer *);
85 static int g_part_mbr_read(struct g_part_table *, struct g_consumer *);
86 static int g_part_mbr_setunset(struct g_part_table *, struct g_part_entry *,
87 const char *, unsigned int);
88 static const char *g_part_mbr_type(struct g_part_table *, struct g_part_entry *,
89 char *, size_t);
90 static int g_part_mbr_write(struct g_part_table *, struct g_consumer *);
91 static int g_part_mbr_resize(struct g_part_table *, struct g_part_entry *,
92 struct g_part_parms *);
93
94 static kobj_method_t g_part_mbr_methods[] = {
95 KOBJMETHOD(g_part_add, g_part_mbr_add),
96 KOBJMETHOD(g_part_bootcode, g_part_mbr_bootcode),
97 KOBJMETHOD(g_part_create, g_part_mbr_create),
98 KOBJMETHOD(g_part_destroy, g_part_mbr_destroy),
99 KOBJMETHOD(g_part_dumpconf, g_part_mbr_dumpconf),
100 KOBJMETHOD(g_part_dumpto, g_part_mbr_dumpto),
101 KOBJMETHOD(g_part_modify, g_part_mbr_modify),
102 KOBJMETHOD(g_part_resize, g_part_mbr_resize),
103 KOBJMETHOD(g_part_name, g_part_mbr_name),
104 KOBJMETHOD(g_part_probe, g_part_mbr_probe),
105 KOBJMETHOD(g_part_read, g_part_mbr_read),
106 KOBJMETHOD(g_part_setunset, g_part_mbr_setunset),
107 KOBJMETHOD(g_part_type, g_part_mbr_type),
108 KOBJMETHOD(g_part_write, g_part_mbr_write),
109 { 0, 0 }
110 };
111
112 static struct g_part_scheme g_part_mbr_scheme = {
113 "MBR",
114 g_part_mbr_methods,
115 sizeof(struct g_part_mbr_table),
116 .gps_entrysz = sizeof(struct g_part_mbr_entry),
117 .gps_minent = NDOSPART,
118 .gps_defent = NDOSPART,
119 .gps_maxent = NDOSPART,
120 .gps_bootcodesz = MBRSIZE,
121 };
122 G_PART_SCHEME_DECLARE(g_part_mbr);
123 MODULE_VERSION(geom_part_mbr, 0);
124
125 static struct g_part_mbr_alias {
126 u_char typ;
127 int alias;
128 } mbr_alias_match[] = {
129 { DOSPTYP_386BSD, G_PART_ALIAS_FREEBSD },
130 { DOSPTYP_APPLE_BOOT, G_PART_ALIAS_APPLE_BOOT },
131 { DOSPTYP_APPLE_UFS, G_PART_ALIAS_APPLE_UFS },
132 { DOSPTYP_EFI, G_PART_ALIAS_EFI },
133 { DOSPTYP_EXT, G_PART_ALIAS_EBR },
134 { DOSPTYP_EXTLBA, G_PART_ALIAS_EBR },
135 { DOSPTYP_FAT16, G_PART_ALIAS_MS_FAT16 },
136 { DOSPTYP_FAT32, G_PART_ALIAS_MS_FAT32 },
137 { DOSPTYP_FAT32LBA, G_PART_ALIAS_MS_FAT32LBA },
138 { DOSPTYP_HFS, G_PART_ALIAS_APPLE_HFS },
139 { DOSPTYP_LDM, G_PART_ALIAS_MS_LDM_DATA },
140 { DOSPTYP_LINLVM, G_PART_ALIAS_LINUX_LVM },
141 { DOSPTYP_LINRAID, G_PART_ALIAS_LINUX_RAID },
142 { DOSPTYP_LINSWP, G_PART_ALIAS_LINUX_SWAP },
143 { DOSPTYP_LINUX, G_PART_ALIAS_LINUX_DATA },
144 { DOSPTYP_NTFS, G_PART_ALIAS_MS_NTFS },
145 { DOSPTYP_PPCBOOT, G_PART_ALIAS_PREP_BOOT },
146 { DOSPTYP_VMFS, G_PART_ALIAS_VMFS },
147 { DOSPTYP_VMKDIAG, G_PART_ALIAS_VMKDIAG },
148 };
149
150 static int
mbr_parse_type(const char * type,u_char * dp_typ)151 mbr_parse_type(const char *type, u_char *dp_typ)
152 {
153 const char *alias;
154 char *endp;
155 long lt;
156 int i;
157
158 if (type[0] == '!') {
159 lt = strtol(type + 1, &endp, 0);
160 if (type[1] == '\0' || *endp != '\0' || lt <= 0 || lt >= 256)
161 return (EINVAL);
162 *dp_typ = (u_char)lt;
163 return (0);
164 }
165 for (i = 0; i < nitems(mbr_alias_match); i++) {
166 alias = g_part_alias_name(mbr_alias_match[i].alias);
167 if (strcasecmp(type, alias) == 0) {
168 *dp_typ = mbr_alias_match[i].typ;
169 return (0);
170 }
171 }
172 return (EINVAL);
173 }
174
175 static int
mbr_probe_bpb(u_char * bpb)176 mbr_probe_bpb(u_char *bpb)
177 {
178 uint16_t secsz;
179 uint8_t clstsz;
180
181 #define PO2(x) ((x & (x - 1)) == 0)
182 secsz = le16dec(bpb);
183 if (secsz < 512 || secsz > 4096 || !PO2(secsz))
184 return (0);
185 clstsz = bpb[2];
186 if (clstsz < 1 || clstsz > 128 || !PO2(clstsz))
187 return (0);
188 #undef PO2
189
190 return (1);
191 }
192
193 static void
mbr_set_chs(struct g_part_table * table,uint32_t lba,u_char * cylp,u_char * hdp,u_char * secp)194 mbr_set_chs(struct g_part_table *table, uint32_t lba, u_char *cylp, u_char *hdp,
195 u_char *secp)
196 {
197 uint32_t cyl, hd, sec;
198
199 sec = lba % table->gpt_sectors + 1;
200 lba /= table->gpt_sectors;
201 hd = lba % table->gpt_heads;
202 lba /= table->gpt_heads;
203 cyl = lba;
204 if (cyl > 1023)
205 sec = hd = cyl = ~0;
206
207 *cylp = cyl & 0xff;
208 *hdp = hd & 0xff;
209 *secp = (sec & 0x3f) | ((cyl >> 2) & 0xc0);
210 }
211
212 static int
mbr_align(struct g_part_table * basetable,uint32_t * start,uint32_t * size)213 mbr_align(struct g_part_table *basetable, uint32_t *start, uint32_t *size)
214 {
215 uint32_t sectors;
216
217 if (enforce_chs == 0)
218 return (0);
219 sectors = basetable->gpt_sectors;
220 if (*size < sectors)
221 return (EINVAL);
222 if (start != NULL && (*start % sectors)) {
223 *size += (*start % sectors) - sectors;
224 *start -= (*start % sectors) - sectors;
225 }
226 if (*size % sectors)
227 *size -= (*size % sectors);
228 if (*size < sectors)
229 return (EINVAL);
230 return (0);
231 }
232
233 static int
g_part_mbr_add(struct g_part_table * basetable,struct g_part_entry * baseentry,struct g_part_parms * gpp)234 g_part_mbr_add(struct g_part_table *basetable, struct g_part_entry *baseentry,
235 struct g_part_parms *gpp)
236 {
237 struct g_part_mbr_entry *entry;
238 uint32_t start, size;
239
240 if (gpp->gpp_parms & G_PART_PARM_LABEL)
241 return (EINVAL);
242
243 entry = (struct g_part_mbr_entry *)baseentry;
244 start = gpp->gpp_start;
245 size = gpp->gpp_size;
246 if (mbr_align(basetable, &start, &size) != 0)
247 return (EINVAL);
248 if (baseentry->gpe_deleted)
249 bzero(&entry->ent, sizeof(entry->ent));
250
251 KASSERT(baseentry->gpe_start <= start, ("%s", __func__));
252 KASSERT(baseentry->gpe_end >= start + size - 1, ("%s", __func__));
253 baseentry->gpe_start = start;
254 baseentry->gpe_end = start + size - 1;
255 entry->ent.dp_start = start;
256 entry->ent.dp_size = size;
257 mbr_set_chs(basetable, baseentry->gpe_start, &entry->ent.dp_scyl,
258 &entry->ent.dp_shd, &entry->ent.dp_ssect);
259 mbr_set_chs(basetable, baseentry->gpe_end, &entry->ent.dp_ecyl,
260 &entry->ent.dp_ehd, &entry->ent.dp_esect);
261 return (mbr_parse_type(gpp->gpp_type, &entry->ent.dp_typ));
262 }
263
264 static int
g_part_mbr_bootcode(struct g_part_table * basetable,struct g_part_parms * gpp)265 g_part_mbr_bootcode(struct g_part_table *basetable, struct g_part_parms *gpp)
266 {
267 struct g_part_mbr_table *table;
268 uint32_t dsn;
269
270 if (gpp->gpp_codesize != MBRSIZE)
271 return (ENODEV);
272
273 table = (struct g_part_mbr_table *)basetable;
274 dsn = *(uint32_t *)(table->mbr + DOSDSNOFF);
275 bcopy(gpp->gpp_codeptr, table->mbr, DOSPARTOFF);
276 if (dsn != 0 && !gpp->gpp_skip_dsn)
277 *(uint32_t *)(table->mbr + DOSDSNOFF) = dsn;
278 return (0);
279 }
280
281 static int
g_part_mbr_create(struct g_part_table * basetable,struct g_part_parms * gpp)282 g_part_mbr_create(struct g_part_table *basetable, struct g_part_parms *gpp)
283 {
284 struct g_provider *pp;
285 struct g_part_mbr_table *table;
286
287 pp = gpp->gpp_provider;
288 if (pp->sectorsize < MBRSIZE)
289 return (ENOSPC);
290
291 basetable->gpt_first = basetable->gpt_sectors;
292 basetable->gpt_last = MIN(pp->mediasize / pp->sectorsize,
293 UINT32_MAX) - 1;
294
295 table = (struct g_part_mbr_table *)basetable;
296 le16enc(table->mbr + DOSMAGICOFFSET, DOSMAGIC);
297 return (0);
298 }
299
300 static int
g_part_mbr_destroy(struct g_part_table * basetable,struct g_part_parms * gpp)301 g_part_mbr_destroy(struct g_part_table *basetable, struct g_part_parms *gpp)
302 {
303
304 /* Wipe the first sector to clear the partitioning. */
305 basetable->gpt_smhead |= 1;
306 return (0);
307 }
308
309 static void
g_part_mbr_efimedia(struct g_part_mbr_table * table,struct g_part_mbr_entry * entry,struct sbuf * sb)310 g_part_mbr_efimedia(struct g_part_mbr_table *table, struct g_part_mbr_entry *entry,
311 struct sbuf *sb)
312 {
313 uint32_t dsn;
314
315 dsn = le32dec(table->mbr + DOSDSNOFF);
316 sbuf_printf(sb, "HD(%d,MBR,%#08x,%#jx,%#jx)",
317 entry->base.gpe_index, dsn, (intmax_t)entry->base.gpe_start,
318 (intmax_t)(entry->base.gpe_end - entry->base.gpe_start + 1));
319 }
320
321 static void
g_part_mbr_dumpconf(struct g_part_table * basetable,struct g_part_entry * baseentry,struct sbuf * sb,const char * indent)322 g_part_mbr_dumpconf(struct g_part_table *basetable, struct g_part_entry *baseentry,
323 struct sbuf *sb, const char *indent)
324 {
325 struct g_part_mbr_entry *entry;
326 struct g_part_mbr_table *table;
327
328 table = (struct g_part_mbr_table *)basetable;
329 entry = (struct g_part_mbr_entry *)baseentry;
330 if (indent == NULL) {
331 /* conftxt: libdisk compatibility */
332 sbuf_printf(sb, " xs MBR xt %u", entry->ent.dp_typ);
333 } else if (entry != NULL) {
334 /* confxml: partition entry information */
335 sbuf_printf(sb, "%s<rawtype>%u</rawtype>\n", indent,
336 entry->ent.dp_typ);
337 if (entry->ent.dp_flag & 0x80)
338 sbuf_printf(sb, "%s<attrib>active</attrib>\n", indent);
339 sbuf_printf(sb, "%s<efimedia>", indent);
340 g_part_mbr_efimedia(table, entry, sb);
341 sbuf_cat(sb, "</efimedia>\n");
342 } else {
343 /* confxml: scheme information */
344 }
345 }
346
347 static int
g_part_mbr_dumpto(struct g_part_table * table,struct g_part_entry * baseentry)348 g_part_mbr_dumpto(struct g_part_table *table, struct g_part_entry *baseentry)
349 {
350 struct g_part_mbr_entry *entry;
351
352 /* Allow dumping to a FreeBSD partition or Linux swap partition only. */
353 entry = (struct g_part_mbr_entry *)baseentry;
354 return ((entry->ent.dp_typ == DOSPTYP_386BSD ||
355 entry->ent.dp_typ == DOSPTYP_LINSWP) ? 1 : 0);
356 }
357
358 static int
g_part_mbr_modify(struct g_part_table * basetable,struct g_part_entry * baseentry,struct g_part_parms * gpp)359 g_part_mbr_modify(struct g_part_table *basetable,
360 struct g_part_entry *baseentry, struct g_part_parms *gpp)
361 {
362 struct g_part_mbr_entry *entry;
363
364 if (gpp->gpp_parms & G_PART_PARM_LABEL)
365 return (EINVAL);
366
367 entry = (struct g_part_mbr_entry *)baseentry;
368 if (gpp->gpp_parms & G_PART_PARM_TYPE)
369 return (mbr_parse_type(gpp->gpp_type, &entry->ent.dp_typ));
370 return (0);
371 }
372
373 static int
g_part_mbr_resize(struct g_part_table * basetable,struct g_part_entry * baseentry,struct g_part_parms * gpp)374 g_part_mbr_resize(struct g_part_table *basetable,
375 struct g_part_entry *baseentry, struct g_part_parms *gpp)
376 {
377 struct g_part_mbr_entry *entry;
378 struct g_provider *pp;
379 uint32_t size;
380
381 if (baseentry == NULL) {
382 pp = LIST_FIRST(&basetable->gpt_gp->consumer)->provider;
383 basetable->gpt_last = MIN(pp->mediasize / pp->sectorsize,
384 UINT32_MAX) - 1;
385 return (0);
386 }
387 size = gpp->gpp_size;
388 if (mbr_align(basetable, NULL, &size) != 0)
389 return (EINVAL);
390 /* XXX: prevent unexpected shrinking. */
391 pp = baseentry->gpe_pp;
392 if ((g_debugflags & G_F_FOOTSHOOTING) == 0 && size < gpp->gpp_size &&
393 pp->mediasize / pp->sectorsize > size)
394 return (EBUSY);
395 entry = (struct g_part_mbr_entry *)baseentry;
396 baseentry->gpe_end = baseentry->gpe_start + size - 1;
397 entry->ent.dp_size = size;
398 mbr_set_chs(basetable, baseentry->gpe_end, &entry->ent.dp_ecyl,
399 &entry->ent.dp_ehd, &entry->ent.dp_esect);
400 return (0);
401 }
402
403 static const char *
g_part_mbr_name(struct g_part_table * table,struct g_part_entry * baseentry,char * buf,size_t bufsz)404 g_part_mbr_name(struct g_part_table *table, struct g_part_entry *baseentry,
405 char *buf, size_t bufsz)
406 {
407
408 snprintf(buf, bufsz, "s%d", baseentry->gpe_index);
409 return (buf);
410 }
411
412 static int
g_part_mbr_probe(struct g_part_table * table,struct g_consumer * cp)413 g_part_mbr_probe(struct g_part_table *table, struct g_consumer *cp)
414 {
415 char psn[8];
416 struct g_provider *pp;
417 u_char *buf, *p;
418 int error, index, res, sum;
419 uint16_t magic;
420
421 pp = cp->provider;
422
423 /* Sanity-check the provider. */
424 if (pp->sectorsize < MBRSIZE || pp->mediasize < pp->sectorsize)
425 return (ENOSPC);
426 if (pp->sectorsize > 4096)
427 return (ENXIO);
428
429 /* We don't nest under an MBR (see EBR instead). */
430 error = g_getattr("PART::scheme", cp, &psn);
431 if (error == 0 && strcmp(psn, g_part_mbr_scheme.name) == 0)
432 return (ELOOP);
433
434 /* Check that there's a MBR. */
435 buf = g_read_data(cp, 0L, pp->sectorsize, &error);
436 if (buf == NULL)
437 return (error);
438
439 /* We goto out on mismatch. */
440 res = ENXIO;
441
442 magic = le16dec(buf + DOSMAGICOFFSET);
443 if (magic != DOSMAGIC)
444 goto out;
445
446 for (index = 0; index < NDOSPART; index++) {
447 p = buf + DOSPARTOFF + index * DOSPARTSIZE;
448 if (p[0] != 0 && p[0] != 0x80)
449 goto out;
450 }
451
452 /*
453 * If the partition table does not consist of all zeroes,
454 * assume we have a MBR. If it's all zeroes, we could have
455 * a boot sector. For example, a boot sector that doesn't
456 * have boot code -- common on non-i386 hardware. In that
457 * case we check if we have a possible BPB. If so, then we
458 * assume we have a boot sector instead.
459 */
460 sum = 0;
461 for (index = 0; index < NDOSPART * DOSPARTSIZE; index++)
462 sum += buf[DOSPARTOFF + index];
463 if (sum != 0 || !mbr_probe_bpb(buf + 0x0b))
464 res = G_PART_PROBE_PRI_NORM;
465
466 out:
467 g_free(buf);
468 return (res);
469 }
470
471 static int
g_part_mbr_read(struct g_part_table * basetable,struct g_consumer * cp)472 g_part_mbr_read(struct g_part_table *basetable, struct g_consumer *cp)
473 {
474 struct dos_partition ent;
475 struct g_provider *pp;
476 struct g_part_mbr_table *table;
477 struct g_part_mbr_entry *entry;
478 u_char *buf, *p;
479 off_t chs, msize, first;
480 u_int sectors, heads;
481 int error, index;
482
483 pp = cp->provider;
484 table = (struct g_part_mbr_table *)basetable;
485 first = basetable->gpt_sectors;
486 msize = MIN(pp->mediasize / pp->sectorsize, UINT32_MAX);
487
488 buf = g_read_data(cp, 0L, pp->sectorsize, &error);
489 if (buf == NULL)
490 return (error);
491
492 bcopy(buf, table->mbr, sizeof(table->mbr));
493 for (index = NDOSPART - 1; index >= 0; index--) {
494 p = buf + DOSPARTOFF + index * DOSPARTSIZE;
495 ent.dp_flag = p[0];
496 ent.dp_shd = p[1];
497 ent.dp_ssect = p[2];
498 ent.dp_scyl = p[3];
499 ent.dp_typ = p[4];
500 ent.dp_ehd = p[5];
501 ent.dp_esect = p[6];
502 ent.dp_ecyl = p[7];
503 ent.dp_start = le32dec(p + 8);
504 ent.dp_size = le32dec(p + 12);
505 if (ent.dp_typ == 0 || ent.dp_typ == DOSPTYP_PMBR)
506 continue;
507 if (ent.dp_start == 0 || ent.dp_size == 0)
508 continue;
509 sectors = ent.dp_esect & 0x3f;
510 if (sectors > basetable->gpt_sectors &&
511 !basetable->gpt_fixgeom) {
512 g_part_geometry_heads(msize, sectors, &chs, &heads);
513 if (chs != 0) {
514 basetable->gpt_sectors = sectors;
515 basetable->gpt_heads = heads;
516 }
517 }
518 if (ent.dp_start < first)
519 first = ent.dp_start;
520 entry = (struct g_part_mbr_entry *)g_part_new_entry(basetable,
521 index + 1, ent.dp_start, ent.dp_start + ent.dp_size - 1);
522 entry->ent = ent;
523 }
524
525 basetable->gpt_entries = NDOSPART;
526 basetable->gpt_first = basetable->gpt_sectors;
527 basetable->gpt_last = msize - 1;
528
529 if (first < basetable->gpt_first)
530 basetable->gpt_first = 1;
531
532 g_free(buf);
533 return (0);
534 }
535
536 static int
g_part_mbr_setunset(struct g_part_table * table,struct g_part_entry * baseentry,const char * attrib,unsigned int set)537 g_part_mbr_setunset(struct g_part_table *table, struct g_part_entry *baseentry,
538 const char *attrib, unsigned int set)
539 {
540 struct g_part_entry *iter;
541 struct g_part_mbr_entry *entry;
542 int changed;
543
544 if (baseentry == NULL)
545 return (ENODEV);
546 if (strcasecmp(attrib, "active") != 0)
547 return (EINVAL);
548
549 /* Only one entry can have the active attribute. */
550 LIST_FOREACH(iter, &table->gpt_entry, gpe_entry) {
551 if (iter->gpe_deleted)
552 continue;
553 changed = 0;
554 entry = (struct g_part_mbr_entry *)iter;
555 if (iter == baseentry) {
556 if (set && (entry->ent.dp_flag & 0x80) == 0) {
557 entry->ent.dp_flag |= 0x80;
558 changed = 1;
559 } else if (!set && (entry->ent.dp_flag & 0x80)) {
560 entry->ent.dp_flag &= ~0x80;
561 changed = 1;
562 }
563 } else {
564 if (set && (entry->ent.dp_flag & 0x80)) {
565 entry->ent.dp_flag &= ~0x80;
566 changed = 1;
567 }
568 }
569 if (changed && !iter->gpe_created)
570 iter->gpe_modified = 1;
571 }
572 return (0);
573 }
574
575 static const char *
g_part_mbr_type(struct g_part_table * basetable,struct g_part_entry * baseentry,char * buf,size_t bufsz)576 g_part_mbr_type(struct g_part_table *basetable, struct g_part_entry *baseentry,
577 char *buf, size_t bufsz)
578 {
579 struct g_part_mbr_entry *entry;
580 int i;
581
582 entry = (struct g_part_mbr_entry *)baseentry;
583 for (i = 0; i < nitems(mbr_alias_match); i++) {
584 if (mbr_alias_match[i].typ == entry->ent.dp_typ)
585 return (g_part_alias_name(mbr_alias_match[i].alias));
586 }
587 snprintf(buf, bufsz, "!%d", entry->ent.dp_typ);
588 return (buf);
589 }
590
591 static int
g_part_mbr_write(struct g_part_table * basetable,struct g_consumer * cp)592 g_part_mbr_write(struct g_part_table *basetable, struct g_consumer *cp)
593 {
594 struct g_part_entry *baseentry;
595 struct g_part_mbr_entry *entry;
596 struct g_part_mbr_table *table;
597 u_char *p;
598 int error, index;
599
600 table = (struct g_part_mbr_table *)basetable;
601 baseentry = LIST_FIRST(&basetable->gpt_entry);
602 for (index = 1; index <= basetable->gpt_entries; index++) {
603 p = table->mbr + DOSPARTOFF + (index - 1) * DOSPARTSIZE;
604 entry = (baseentry != NULL && index == baseentry->gpe_index)
605 ? (struct g_part_mbr_entry *)baseentry : NULL;
606 if (entry != NULL && !baseentry->gpe_deleted) {
607 p[0] = entry->ent.dp_flag;
608 p[1] = entry->ent.dp_shd;
609 p[2] = entry->ent.dp_ssect;
610 p[3] = entry->ent.dp_scyl;
611 p[4] = entry->ent.dp_typ;
612 p[5] = entry->ent.dp_ehd;
613 p[6] = entry->ent.dp_esect;
614 p[7] = entry->ent.dp_ecyl;
615 le32enc(p + 8, entry->ent.dp_start);
616 le32enc(p + 12, entry->ent.dp_size);
617 } else
618 bzero(p, DOSPARTSIZE);
619
620 if (entry != NULL)
621 baseentry = LIST_NEXT(baseentry, gpe_entry);
622 }
623
624 error = g_write_data(cp, 0, table->mbr, cp->provider->sectorsize);
625 return (error);
626 }
627