1 /*-
2 * Copyright (c) 2007-2009 Marcel Moolenaar
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
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.
14 *
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.
25 */
26
27 #include "opt_geom.h"
28
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD: stable/9/sys/geom/part/g_part_ebr.c 265911 2014-05-12 11:14:07Z ae $");
31
32 #include <sys/param.h>
33 #include <sys/bio.h>
34 #include <sys/diskmbr.h>
35 #include <sys/endian.h>
36 #include <sys/kernel.h>
37 #include <sys/kobj.h>
38 #include <sys/limits.h>
39 #include <sys/lock.h>
40 #include <sys/malloc.h>
41 #include <sys/mutex.h>
42 #include <sys/queue.h>
43 #include <sys/sbuf.h>
44 #include <sys/systm.h>
45 #include <sys/sysctl.h>
46 #include <geom/geom.h>
47 #include <geom/part/g_part.h>
48
49 #include "g_part_if.h"
50
51 FEATURE(geom_part_ebr,
52 "GEOM partitioning class for extended boot records support");
53 #if defined(GEOM_PART_EBR_COMPAT)
54 FEATURE(geom_part_ebr_compat,
55 "GEOM EBR partitioning class: backward-compatible partition names");
56 #endif
57
58 #define EBRSIZE 512
59
60 struct g_part_ebr_table {
61 struct g_part_table base;
62 #ifndef GEOM_PART_EBR_COMPAT
63 u_char ebr[EBRSIZE];
64 #endif
65 };
66
67 struct g_part_ebr_entry {
68 struct g_part_entry base;
69 struct dos_partition ent;
70 };
71
72 static int g_part_ebr_add(struct g_part_table *, struct g_part_entry *,
73 struct g_part_parms *);
74 static int g_part_ebr_create(struct g_part_table *, struct g_part_parms *);
75 static int g_part_ebr_destroy(struct g_part_table *, struct g_part_parms *);
76 static void g_part_ebr_dumpconf(struct g_part_table *, struct g_part_entry *,
77 struct sbuf *, const char *);
78 static int g_part_ebr_dumpto(struct g_part_table *, struct g_part_entry *);
79 #if defined(GEOM_PART_EBR_COMPAT)
80 static void g_part_ebr_fullname(struct g_part_table *, struct g_part_entry *,
81 struct sbuf *, const char *);
82 #endif
83 static int g_part_ebr_modify(struct g_part_table *, struct g_part_entry *,
84 struct g_part_parms *);
85 static const char *g_part_ebr_name(struct g_part_table *, struct g_part_entry *,
86 char *, size_t);
87 static int g_part_ebr_precheck(struct g_part_table *, enum g_part_ctl,
88 struct g_part_parms *);
89 static int g_part_ebr_probe(struct g_part_table *, struct g_consumer *);
90 static int g_part_ebr_read(struct g_part_table *, struct g_consumer *);
91 static int g_part_ebr_setunset(struct g_part_table *, struct g_part_entry *,
92 const char *, unsigned int);
93 static const char *g_part_ebr_type(struct g_part_table *, struct g_part_entry *,
94 char *, size_t);
95 static int g_part_ebr_write(struct g_part_table *, struct g_consumer *);
96
97 static kobj_method_t g_part_ebr_methods[] = {
98 KOBJMETHOD(g_part_add, g_part_ebr_add),
99 KOBJMETHOD(g_part_create, g_part_ebr_create),
100 KOBJMETHOD(g_part_destroy, g_part_ebr_destroy),
101 KOBJMETHOD(g_part_dumpconf, g_part_ebr_dumpconf),
102 KOBJMETHOD(g_part_dumpto, g_part_ebr_dumpto),
103 #if defined(GEOM_PART_EBR_COMPAT)
104 KOBJMETHOD(g_part_fullname, g_part_ebr_fullname),
105 #endif
106 KOBJMETHOD(g_part_modify, g_part_ebr_modify),
107 KOBJMETHOD(g_part_name, g_part_ebr_name),
108 KOBJMETHOD(g_part_precheck, g_part_ebr_precheck),
109 KOBJMETHOD(g_part_probe, g_part_ebr_probe),
110 KOBJMETHOD(g_part_read, g_part_ebr_read),
111 KOBJMETHOD(g_part_setunset, g_part_ebr_setunset),
112 KOBJMETHOD(g_part_type, g_part_ebr_type),
113 KOBJMETHOD(g_part_write, g_part_ebr_write),
114 { 0, 0 }
115 };
116
117 static struct g_part_scheme g_part_ebr_scheme = {
118 "EBR",
119 g_part_ebr_methods,
120 sizeof(struct g_part_ebr_table),
121 .gps_entrysz = sizeof(struct g_part_ebr_entry),
122 .gps_minent = 1,
123 .gps_maxent = INT_MAX,
124 };
125 G_PART_SCHEME_DECLARE(g_part_ebr);
126
127 static struct g_part_ebr_alias {
128 u_char typ;
129 int alias;
130 } ebr_alias_match[] = {
131 { DOSPTYP_386BSD, G_PART_ALIAS_FREEBSD },
132 { DOSPTYP_NTFS, G_PART_ALIAS_MS_NTFS },
133 { DOSPTYP_FAT32, G_PART_ALIAS_MS_FAT32 },
134 { DOSPTYP_LINSWP, G_PART_ALIAS_LINUX_SWAP },
135 { DOSPTYP_LINUX, G_PART_ALIAS_LINUX_DATA },
136 { DOSPTYP_LINLVM, G_PART_ALIAS_LINUX_LVM },
137 { DOSPTYP_LINRAID, G_PART_ALIAS_LINUX_RAID },
138 };
139
140 static void ebr_set_chs(struct g_part_table *, uint32_t, u_char *, u_char *,
141 u_char *);
142
143 static void
ebr_entry_decode(const char * p,struct dos_partition * ent)144 ebr_entry_decode(const char *p, struct dos_partition *ent)
145 {
146 ent->dp_flag = p[0];
147 ent->dp_shd = p[1];
148 ent->dp_ssect = p[2];
149 ent->dp_scyl = p[3];
150 ent->dp_typ = p[4];
151 ent->dp_ehd = p[5];
152 ent->dp_esect = p[6];
153 ent->dp_ecyl = p[7];
154 ent->dp_start = le32dec(p + 8);
155 ent->dp_size = le32dec(p + 12);
156 }
157
158 static void
ebr_entry_link(struct g_part_table * table,uint32_t start,uint32_t end,u_char * buf)159 ebr_entry_link(struct g_part_table *table, uint32_t start, uint32_t end,
160 u_char *buf)
161 {
162
163 buf[0] = 0 /* dp_flag */;
164 ebr_set_chs(table, start, &buf[3] /* dp_scyl */, &buf[1] /* dp_shd */,
165 &buf[2] /* dp_ssect */);
166 buf[4] = 5 /* dp_typ */;
167 ebr_set_chs(table, end, &buf[7] /* dp_ecyl */, &buf[5] /* dp_ehd */,
168 &buf[6] /* dp_esect */);
169 le32enc(buf + 8, start);
170 le32enc(buf + 12, end - start + 1);
171 }
172
173 static int
ebr_parse_type(const char * type,u_char * dp_typ)174 ebr_parse_type(const char *type, u_char *dp_typ)
175 {
176 const char *alias;
177 char *endp;
178 long lt;
179 int i;
180
181 if (type[0] == '!') {
182 lt = strtol(type + 1, &endp, 0);
183 if (type[1] == '\0' || *endp != '\0' || lt <= 0 || lt >= 256)
184 return (EINVAL);
185 *dp_typ = (u_char)lt;
186 return (0);
187 }
188 for (i = 0;
189 i < sizeof(ebr_alias_match) / sizeof(ebr_alias_match[0]); i++) {
190 alias = g_part_alias_name(ebr_alias_match[i].alias);
191 if (strcasecmp(type, alias) == 0) {
192 *dp_typ = ebr_alias_match[i].typ;
193 return (0);
194 }
195 }
196 return (EINVAL);
197 }
198
199
200 static void
ebr_set_chs(struct g_part_table * table,uint32_t lba,u_char * cylp,u_char * hdp,u_char * secp)201 ebr_set_chs(struct g_part_table *table, uint32_t lba, u_char *cylp, u_char *hdp,
202 u_char *secp)
203 {
204 uint32_t cyl, hd, sec;
205
206 sec = lba % table->gpt_sectors + 1;
207 lba /= table->gpt_sectors;
208 hd = lba % table->gpt_heads;
209 lba /= table->gpt_heads;
210 cyl = lba;
211 if (cyl > 1023)
212 sec = hd = cyl = ~0;
213
214 *cylp = cyl & 0xff;
215 *hdp = hd & 0xff;
216 *secp = (sec & 0x3f) | ((cyl >> 2) & 0xc0);
217 }
218
219 static int
ebr_align(struct g_part_table * basetable,uint32_t * start,uint32_t * size)220 ebr_align(struct g_part_table *basetable, uint32_t *start, uint32_t *size)
221 {
222 uint32_t sectors;
223
224 sectors = basetable->gpt_sectors;
225 if (*size < 2 * sectors)
226 return (EINVAL);
227 if (*start % sectors) {
228 *size += (*start % sectors) - sectors;
229 *start -= (*start % sectors) - sectors;
230 }
231 if (*size % sectors)
232 *size -= (*size % sectors);
233 if (*size < 2 * sectors)
234 return (EINVAL);
235 return (0);
236 }
237
238
239 static int
g_part_ebr_add(struct g_part_table * basetable,struct g_part_entry * baseentry,struct g_part_parms * gpp)240 g_part_ebr_add(struct g_part_table *basetable, struct g_part_entry *baseentry,
241 struct g_part_parms *gpp)
242 {
243 struct g_provider *pp;
244 struct g_part_ebr_entry *entry;
245 uint32_t start, size;
246
247 if (gpp->gpp_parms & G_PART_PARM_LABEL)
248 return (EINVAL);
249
250 pp = LIST_FIRST(&basetable->gpt_gp->consumer)->provider;
251 entry = (struct g_part_ebr_entry *)baseentry;
252 start = gpp->gpp_start;
253 size = gpp->gpp_size;
254 if (ebr_align(basetable, &start, &size) != 0)
255 return (EINVAL);
256 if (baseentry->gpe_deleted)
257 bzero(&entry->ent, sizeof(entry->ent));
258
259 KASSERT(baseentry->gpe_start <= start, ("%s", __func__));
260 KASSERT(baseentry->gpe_end >= start + size - 1, ("%s", __func__));
261 baseentry->gpe_index = (start / basetable->gpt_sectors) + 1;
262 baseentry->gpe_offset =
263 (off_t)(start + basetable->gpt_sectors) * pp->sectorsize;
264 baseentry->gpe_start = start;
265 baseentry->gpe_end = start + size - 1;
266 entry->ent.dp_start = basetable->gpt_sectors;
267 entry->ent.dp_size = size - basetable->gpt_sectors;
268 ebr_set_chs(basetable, entry->ent.dp_start, &entry->ent.dp_scyl,
269 &entry->ent.dp_shd, &entry->ent.dp_ssect);
270 ebr_set_chs(basetable, baseentry->gpe_end, &entry->ent.dp_ecyl,
271 &entry->ent.dp_ehd, &entry->ent.dp_esect);
272 return (ebr_parse_type(gpp->gpp_type, &entry->ent.dp_typ));
273 }
274
275 static int
g_part_ebr_create(struct g_part_table * basetable,struct g_part_parms * gpp)276 g_part_ebr_create(struct g_part_table *basetable, struct g_part_parms *gpp)
277 {
278 char type[64];
279 struct g_consumer *cp;
280 struct g_provider *pp;
281 uint32_t msize;
282 int error;
283
284 pp = gpp->gpp_provider;
285
286 if (pp->sectorsize < EBRSIZE)
287 return (ENOSPC);
288 if (pp->sectorsize > 4096)
289 return (ENXIO);
290
291 /* Check that we have a parent and that it's a MBR. */
292 if (basetable->gpt_depth == 0)
293 return (ENXIO);
294 cp = LIST_FIRST(&pp->consumers);
295 error = g_getattr("PART::scheme", cp, &type);
296 if (error != 0)
297 return (error);
298 if (strcmp(type, "MBR") != 0)
299 return (ENXIO);
300 error = g_getattr("PART::type", cp, &type);
301 if (error != 0)
302 return (error);
303 if (strcmp(type, "ebr") != 0)
304 return (ENXIO);
305
306 msize = MIN(pp->mediasize / pp->sectorsize, UINT32_MAX);
307 basetable->gpt_first = 0;
308 basetable->gpt_last = msize - 1;
309 basetable->gpt_entries = msize / basetable->gpt_sectors;
310 return (0);
311 }
312
313 static int
g_part_ebr_destroy(struct g_part_table * basetable,struct g_part_parms * gpp)314 g_part_ebr_destroy(struct g_part_table *basetable, struct g_part_parms *gpp)
315 {
316
317 /* Wipe the first sector to clear the partitioning. */
318 basetable->gpt_smhead |= 1;
319 return (0);
320 }
321
322 static void
g_part_ebr_dumpconf(struct g_part_table * table,struct g_part_entry * baseentry,struct sbuf * sb,const char * indent)323 g_part_ebr_dumpconf(struct g_part_table *table, struct g_part_entry *baseentry,
324 struct sbuf *sb, const char *indent)
325 {
326 struct g_part_ebr_entry *entry;
327
328 entry = (struct g_part_ebr_entry *)baseentry;
329 if (indent == NULL) {
330 /* conftxt: libdisk compatibility */
331 sbuf_printf(sb, " xs MBREXT xt %u", entry->ent.dp_typ);
332 } else if (entry != NULL) {
333 /* confxml: partition entry information */
334 sbuf_printf(sb, "%s<rawtype>%u</rawtype>\n", indent,
335 entry->ent.dp_typ);
336 if (entry->ent.dp_flag & 0x80)
337 sbuf_printf(sb, "%s<attrib>active</attrib>\n", indent);
338 } else {
339 /* confxml: scheme information */
340 }
341 }
342
343 static int
g_part_ebr_dumpto(struct g_part_table * table,struct g_part_entry * baseentry)344 g_part_ebr_dumpto(struct g_part_table *table, struct g_part_entry *baseentry)
345 {
346 struct g_part_ebr_entry *entry;
347
348 /* Allow dumping to a FreeBSD partition or Linux swap partition only. */
349 entry = (struct g_part_ebr_entry *)baseentry;
350 return ((entry->ent.dp_typ == DOSPTYP_386BSD ||
351 entry->ent.dp_typ == DOSPTYP_LINSWP) ? 1 : 0);
352 }
353
354 #if defined(GEOM_PART_EBR_COMPAT)
355 static void
g_part_ebr_fullname(struct g_part_table * table,struct g_part_entry * entry,struct sbuf * sb,const char * pfx)356 g_part_ebr_fullname(struct g_part_table *table, struct g_part_entry *entry,
357 struct sbuf *sb, const char *pfx)
358 {
359 struct g_part_entry *iter;
360 u_int idx;
361
362 idx = 5;
363 LIST_FOREACH(iter, &table->gpt_entry, gpe_entry) {
364 if (iter == entry)
365 break;
366 idx++;
367 }
368 sbuf_printf(sb, "%.*s%u", (int)strlen(pfx) - 1, pfx, idx);
369 }
370 #endif
371
372 static int
g_part_ebr_modify(struct g_part_table * basetable,struct g_part_entry * baseentry,struct g_part_parms * gpp)373 g_part_ebr_modify(struct g_part_table *basetable,
374 struct g_part_entry *baseentry, struct g_part_parms *gpp)
375 {
376 struct g_part_ebr_entry *entry;
377
378 if (gpp->gpp_parms & G_PART_PARM_LABEL)
379 return (EINVAL);
380
381 entry = (struct g_part_ebr_entry *)baseentry;
382 if (gpp->gpp_parms & G_PART_PARM_TYPE)
383 return (ebr_parse_type(gpp->gpp_type, &entry->ent.dp_typ));
384 return (0);
385 }
386
387 static const char *
g_part_ebr_name(struct g_part_table * table,struct g_part_entry * entry,char * buf,size_t bufsz)388 g_part_ebr_name(struct g_part_table *table, struct g_part_entry *entry,
389 char *buf, size_t bufsz)
390 {
391
392 snprintf(buf, bufsz, "+%08u", entry->gpe_index);
393 return (buf);
394 }
395
396 static int
g_part_ebr_precheck(struct g_part_table * table,enum g_part_ctl req,struct g_part_parms * gpp)397 g_part_ebr_precheck(struct g_part_table *table, enum g_part_ctl req,
398 struct g_part_parms *gpp)
399 {
400 #if defined(GEOM_PART_EBR_COMPAT)
401 if (req == G_PART_CTL_DESTROY)
402 return (0);
403 return (ECANCELED);
404 #else
405 /*
406 * The index is a function of the start of the partition.
407 * This is not something the user can override, nor is it
408 * something the common code will do right. We can set the
409 * index now so that we get what we need.
410 */
411 if (req == G_PART_CTL_ADD)
412 gpp->gpp_index = (gpp->gpp_start / table->gpt_sectors) + 1;
413 return (0);
414 #endif
415 }
416
417 static int
g_part_ebr_probe(struct g_part_table * table,struct g_consumer * cp)418 g_part_ebr_probe(struct g_part_table *table, struct g_consumer *cp)
419 {
420 char type[64];
421 struct g_provider *pp;
422 u_char *buf, *p;
423 int error, index, res;
424 uint16_t magic;
425
426 pp = cp->provider;
427
428 /* Sanity-check the provider. */
429 if (pp->sectorsize < EBRSIZE || pp->mediasize < pp->sectorsize)
430 return (ENOSPC);
431 if (pp->sectorsize > 4096)
432 return (ENXIO);
433
434 /* Check that we have a parent and that it's a MBR. */
435 if (table->gpt_depth == 0)
436 return (ENXIO);
437 error = g_getattr("PART::scheme", cp, &type);
438 if (error != 0)
439 return (error);
440 if (strcmp(type, "MBR") != 0)
441 return (ENXIO);
442 /* Check that partition has type DOSPTYP_EBR. */
443 error = g_getattr("PART::type", cp, &type);
444 if (error != 0)
445 return (error);
446 if (strcmp(type, "ebr") != 0)
447 return (ENXIO);
448
449 /* Check that there's a EBR. */
450 buf = g_read_data(cp, 0L, pp->sectorsize, &error);
451 if (buf == NULL)
452 return (error);
453
454 /* We goto out on mismatch. */
455 res = ENXIO;
456
457 magic = le16dec(buf + DOSMAGICOFFSET);
458 if (magic != DOSMAGIC)
459 goto out;
460
461 for (index = 0; index < 2; index++) {
462 p = buf + DOSPARTOFF + index * DOSPARTSIZE;
463 if (p[0] != 0 && p[0] != 0x80)
464 goto out;
465 }
466 res = G_PART_PROBE_PRI_NORM;
467
468 out:
469 g_free(buf);
470 return (res);
471 }
472
473 static int
g_part_ebr_read(struct g_part_table * basetable,struct g_consumer * cp)474 g_part_ebr_read(struct g_part_table *basetable, struct g_consumer *cp)
475 {
476 struct dos_partition ent[2];
477 struct g_provider *pp;
478 struct g_part_entry *baseentry;
479 struct g_part_ebr_table *table;
480 struct g_part_ebr_entry *entry;
481 u_char *buf;
482 off_t ofs, msize;
483 u_int lba;
484 int error, index;
485
486 pp = cp->provider;
487 table = (struct g_part_ebr_table *)basetable;
488 msize = MIN(pp->mediasize / pp->sectorsize, UINT32_MAX);
489
490 lba = 0;
491 while (1) {
492 ofs = (off_t)lba * pp->sectorsize;
493 buf = g_read_data(cp, ofs, pp->sectorsize, &error);
494 if (buf == NULL)
495 return (error);
496
497 ebr_entry_decode(buf + DOSPARTOFF + 0 * DOSPARTSIZE, ent + 0);
498 ebr_entry_decode(buf + DOSPARTOFF + 1 * DOSPARTSIZE, ent + 1);
499
500 /* The 3rd & 4th entries should be zeroes. */
501 if (le64dec(buf + DOSPARTOFF + 2 * DOSPARTSIZE) +
502 le64dec(buf + DOSPARTOFF + 3 * DOSPARTSIZE) != 0) {
503 basetable->gpt_corrupt = 1;
504 printf("GEOM: %s: invalid entries in the EBR ignored.\n",
505 pp->name);
506 }
507 #ifndef GEOM_PART_EBR_COMPAT
508 /* Save the first EBR, it can contain a boot code */
509 if (lba == 0)
510 bcopy(buf, table->ebr, sizeof(table->ebr));
511 #endif
512 g_free(buf);
513
514 if (ent[0].dp_typ == 0)
515 break;
516
517 if (ent[0].dp_typ == 5 && ent[1].dp_typ == 0) {
518 lba = ent[0].dp_start;
519 continue;
520 }
521
522 index = (lba / basetable->gpt_sectors) + 1;
523 baseentry = (struct g_part_entry *)g_part_new_entry(basetable,
524 index, lba, lba + ent[0].dp_start + ent[0].dp_size - 1);
525 baseentry->gpe_offset = (off_t)(lba + ent[0].dp_start) *
526 pp->sectorsize;
527 entry = (struct g_part_ebr_entry *)baseentry;
528 entry->ent = ent[0];
529
530 if (ent[1].dp_typ == 0)
531 break;
532
533 lba = ent[1].dp_start;
534 }
535
536 basetable->gpt_entries = msize / basetable->gpt_sectors;
537 basetable->gpt_first = 0;
538 basetable->gpt_last = msize - 1;
539 return (0);
540 }
541
542 static int
g_part_ebr_setunset(struct g_part_table * table,struct g_part_entry * baseentry,const char * attrib,unsigned int set)543 g_part_ebr_setunset(struct g_part_table *table, struct g_part_entry *baseentry,
544 const char *attrib, unsigned int set)
545 {
546 struct g_part_entry *iter;
547 struct g_part_ebr_entry *entry;
548 int changed;
549
550 if (baseentry == NULL)
551 return (ENODEV);
552 if (strcasecmp(attrib, "active") != 0)
553 return (EINVAL);
554
555 /* Only one entry can have the active attribute. */
556 LIST_FOREACH(iter, &table->gpt_entry, gpe_entry) {
557 if (iter->gpe_deleted)
558 continue;
559 changed = 0;
560 entry = (struct g_part_ebr_entry *)iter;
561 if (iter == baseentry) {
562 if (set && (entry->ent.dp_flag & 0x80) == 0) {
563 entry->ent.dp_flag |= 0x80;
564 changed = 1;
565 } else if (!set && (entry->ent.dp_flag & 0x80)) {
566 entry->ent.dp_flag &= ~0x80;
567 changed = 1;
568 }
569 } else {
570 if (set && (entry->ent.dp_flag & 0x80)) {
571 entry->ent.dp_flag &= ~0x80;
572 changed = 1;
573 }
574 }
575 if (changed && !iter->gpe_created)
576 iter->gpe_modified = 1;
577 }
578 return (0);
579 }
580
581 static const char *
g_part_ebr_type(struct g_part_table * basetable,struct g_part_entry * baseentry,char * buf,size_t bufsz)582 g_part_ebr_type(struct g_part_table *basetable, struct g_part_entry *baseentry,
583 char *buf, size_t bufsz)
584 {
585 struct g_part_ebr_entry *entry;
586 int i;
587
588 entry = (struct g_part_ebr_entry *)baseentry;
589 for (i = 0;
590 i < sizeof(ebr_alias_match) / sizeof(ebr_alias_match[0]); i++) {
591 if (ebr_alias_match[i].typ == entry->ent.dp_typ)
592 return (g_part_alias_name(ebr_alias_match[i].alias));
593 }
594 snprintf(buf, bufsz, "!%d", entry->ent.dp_typ);
595 return (buf);
596 }
597
598 static int
g_part_ebr_write(struct g_part_table * basetable,struct g_consumer * cp)599 g_part_ebr_write(struct g_part_table *basetable, struct g_consumer *cp)
600 {
601 #ifndef GEOM_PART_EBR_COMPAT
602 struct g_part_ebr_table *table;
603 #endif
604 struct g_provider *pp;
605 struct g_part_entry *baseentry, *next;
606 struct g_part_ebr_entry *entry;
607 u_char *buf;
608 u_char *p;
609 int error;
610
611 pp = cp->provider;
612 buf = g_malloc(pp->sectorsize, M_WAITOK | M_ZERO);
613 #ifndef GEOM_PART_EBR_COMPAT
614 table = (struct g_part_ebr_table *)basetable;
615 bcopy(table->ebr, buf, DOSPARTOFF);
616 #endif
617 le16enc(buf + DOSMAGICOFFSET, DOSMAGIC);
618
619 baseentry = LIST_FIRST(&basetable->gpt_entry);
620 while (baseentry != NULL && baseentry->gpe_deleted)
621 baseentry = LIST_NEXT(baseentry, gpe_entry);
622
623 /* Wipe-out the first EBR when there are no slices. */
624 if (baseentry == NULL) {
625 error = g_write_data(cp, 0, buf, pp->sectorsize);
626 goto out;
627 }
628
629 /*
630 * If the first partition is not in LBA 0, we need to
631 * put a "link" EBR in LBA 0.
632 */
633 if (baseentry->gpe_start != 0) {
634 ebr_entry_link(basetable, (uint32_t)baseentry->gpe_start,
635 (uint32_t)baseentry->gpe_end, buf + DOSPARTOFF);
636 error = g_write_data(cp, 0, buf, pp->sectorsize);
637 if (error)
638 goto out;
639 }
640
641 do {
642 entry = (struct g_part_ebr_entry *)baseentry;
643
644 p = buf + DOSPARTOFF;
645 p[0] = entry->ent.dp_flag;
646 p[1] = entry->ent.dp_shd;
647 p[2] = entry->ent.dp_ssect;
648 p[3] = entry->ent.dp_scyl;
649 p[4] = entry->ent.dp_typ;
650 p[5] = entry->ent.dp_ehd;
651 p[6] = entry->ent.dp_esect;
652 p[7] = entry->ent.dp_ecyl;
653 le32enc(p + 8, entry->ent.dp_start);
654 le32enc(p + 12, entry->ent.dp_size);
655
656 next = LIST_NEXT(baseentry, gpe_entry);
657 while (next != NULL && next->gpe_deleted)
658 next = LIST_NEXT(next, gpe_entry);
659
660 p += DOSPARTSIZE;
661 if (next != NULL)
662 ebr_entry_link(basetable, (uint32_t)next->gpe_start,
663 (uint32_t)next->gpe_end, p);
664 else
665 bzero(p, DOSPARTSIZE);
666
667 error = g_write_data(cp, baseentry->gpe_start * pp->sectorsize,
668 buf, pp->sectorsize);
669 #ifndef GEOM_PART_EBR_COMPAT
670 if (baseentry->gpe_start == 0)
671 bzero(buf, DOSPARTOFF);
672 #endif
673 baseentry = next;
674 } while (!error && baseentry != NULL);
675
676 out:
677 g_free(buf);
678 return (error);
679 }
680