sys/geom/part/g_part.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
   3  *
   4  * Copyright (c) 2002, 2005-2009 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/cdefs.h>
  30 __FBSDID("$FreeBSD$");
  31
  32 #include <sys/param.h>
  33 #include <sys/bio.h>
  34 #include <sys/endian.h>
  35 #include <sys/kernel.h>
  36 #include <sys/kobj.h>
  37 #include <sys/limits.h>
  38 #include <sys/lock.h>
  39 #include <sys/malloc.h>
  40 #include <sys/mutex.h>
  41 #include <sys/queue.h>
  42 #include <sys/sbuf.h>
  43 #include <sys/sysctl.h>
  44 #include <sys/systm.h>
  45 #include <sys/uuid.h>
  46 #include <geom/geom.h>
  47 #include <geom/geom_ctl.h>
  48 #include <geom/geom_int.h>
  49 #include <geom/part/g_part.h>
  50
  51 #include "g_part_if.h"
  52
  53 #ifndef _PATH_DEV
  54 #define _PATH_DEV "/dev/"
  55 #endif
  56
  57 static kobj_method_t g_part_null_methods[] = {
  58         { 0, 0 }
  59 };
  60
  61 static struct g_part_scheme g_part_null_scheme = {
  62         "(none)",
  63         g_part_null_methods,
  64         sizeof(struct g_part_table),
  65 };
  66
  67 TAILQ_HEAD(, g_part_scheme) g_part_schemes =
  68     TAILQ_HEAD_INITIALIZER(g_part_schemes);
  69
  70 struct g_part_alias_list {
  71         const char *lexeme;
  72         enum g_part_alias alias;
  73 } g_part_alias_list[G_PART_ALIAS_COUNT] = {
  74         { "apple-apfs", G_PART_ALIAS_APPLE_APFS },
  75         { "apple-boot", G_PART_ALIAS_APPLE_BOOT },
  76         { "apple-core-storage", G_PART_ALIAS_APPLE_CORE_STORAGE },
  77         { "apple-hfs", G_PART_ALIAS_APPLE_HFS },
  78         { "apple-label", G_PART_ALIAS_APPLE_LABEL },
  79         { "apple-raid", G_PART_ALIAS_APPLE_RAID },
  80         { "apple-raid-offline", G_PART_ALIAS_APPLE_RAID_OFFLINE },
  81         { "apple-tv-recovery", G_PART_ALIAS_APPLE_TV_RECOVERY },
  82         { "apple-ufs", G_PART_ALIAS_APPLE_UFS },
  83         { "bios-boot", G_PART_ALIAS_BIOS_BOOT },
  84         { "chromeos-firmware", G_PART_ALIAS_CHROMEOS_FIRMWARE },
  85         { "chromeos-kernel", G_PART_ALIAS_CHROMEOS_KERNEL },
  86         { "chromeos-reserved", G_PART_ALIAS_CHROMEOS_RESERVED },
  87         { "chromeos-root", G_PART_ALIAS_CHROMEOS_ROOT },
  88         { "dragonfly-ccd", G_PART_ALIAS_DFBSD_CCD },
  89         { "dragonfly-hammer", G_PART_ALIAS_DFBSD_HAMMER },
  90         { "dragonfly-hammer2", G_PART_ALIAS_DFBSD_HAMMER2 },
  91         { "dragonfly-label32", G_PART_ALIAS_DFBSD },
  92         { "dragonfly-label64", G_PART_ALIAS_DFBSD64 },
  93         { "dragonfly-legacy", G_PART_ALIAS_DFBSD_LEGACY },
  94         { "dragonfly-swap", G_PART_ALIAS_DFBSD_SWAP },
  95         { "dragonfly-ufs", G_PART_ALIAS_DFBSD_UFS },
  96         { "dragonfly-vinum", G_PART_ALIAS_DFBSD_VINUM },
  97         { "ebr", G_PART_ALIAS_EBR },
  98         { "efi", G_PART_ALIAS_EFI },
  99         { "fat16", G_PART_ALIAS_MS_FAT16 },
 100         { "fat32", G_PART_ALIAS_MS_FAT32 },
 101         { "fat32lba", G_PART_ALIAS_MS_FAT32LBA },
 102         { "freebsd", G_PART_ALIAS_FREEBSD },
 103         { "freebsd-boot", G_PART_ALIAS_FREEBSD_BOOT },
 104         { "freebsd-nandfs", G_PART_ALIAS_FREEBSD_NANDFS },
 105         { "freebsd-swap", G_PART_ALIAS_FREEBSD_SWAP },
 106         { "freebsd-ufs", G_PART_ALIAS_FREEBSD_UFS },
 107         { "freebsd-vinum", G_PART_ALIAS_FREEBSD_VINUM },
 108         { "freebsd-zfs", G_PART_ALIAS_FREEBSD_ZFS },
 109         { "linux-data", G_PART_ALIAS_LINUX_DATA },
 110         { "linux-lvm", G_PART_ALIAS_LINUX_LVM },
 111         { "linux-raid", G_PART_ALIAS_LINUX_RAID },
 112         { "linux-swap", G_PART_ALIAS_LINUX_SWAP },
 113         { "mbr", G_PART_ALIAS_MBR },
 114         { "ms-basic-data", G_PART_ALIAS_MS_BASIC_DATA },
 115         { "ms-ldm-data", G_PART_ALIAS_MS_LDM_DATA },
 116         { "ms-ldm-metadata", G_PART_ALIAS_MS_LDM_METADATA },
 117         { "ms-recovery", G_PART_ALIAS_MS_RECOVERY },
 118         { "ms-reserved", G_PART_ALIAS_MS_RESERVED },
 119         { "ms-spaces", G_PART_ALIAS_MS_SPACES },
 120         { "netbsd-ccd", G_PART_ALIAS_NETBSD_CCD },
 121         { "netbsd-cgd", G_PART_ALIAS_NETBSD_CGD },
 122         { "netbsd-ffs", G_PART_ALIAS_NETBSD_FFS },
 123         { "netbsd-lfs", G_PART_ALIAS_NETBSD_LFS },
 124         { "netbsd-raid", G_PART_ALIAS_NETBSD_RAID },
 125         { "netbsd-swap", G_PART_ALIAS_NETBSD_SWAP },
 126         { "ntfs", G_PART_ALIAS_MS_NTFS },
 127         { "openbsd-data", G_PART_ALIAS_OPENBSD_DATA },
 128         { "prep-boot", G_PART_ALIAS_PREP_BOOT },
 129         { "vmware-reserved", G_PART_ALIAS_VMRESERVED },
 130         { "vmware-vmfs", G_PART_ALIAS_VMFS },
 131         { "vmware-vmkdiag", G_PART_ALIAS_VMKDIAG },
 132         { "vmware-vsanhdr", G_PART_ALIAS_VMVSANHDR },
 133 };
 134
 135 SYSCTL_DECL(_kern_geom);
 136 SYSCTL_NODE(_kern_geom, OID_AUTO, part, CTLFLAG_RW, 0,
 137     "GEOM_PART stuff");
 138 static u_int check_integrity = 1;
 139 SYSCTL_UINT(_kern_geom_part, OID_AUTO, check_integrity,
 140     CTLFLAG_RWTUN, &check_integrity, 1,
 141     "Enable integrity checking");
 142 static u_int auto_resize = 1;
 143 SYSCTL_UINT(_kern_geom_part, OID_AUTO, auto_resize,
 144     CTLFLAG_RWTUN, &auto_resize, 1,
 145     "Enable auto resize");
 146
 147 /*
 148  * The GEOM partitioning class.
 149  */
 150 static g_ctl_req_t g_part_ctlreq;
 151 static g_ctl_destroy_geom_t g_part_destroy_geom;
 152 static g_fini_t g_part_fini;
 153 static g_init_t g_part_init;
 154 static g_taste_t g_part_taste;
 155
 156 static g_access_t g_part_access;
 157 static g_dumpconf_t g_part_dumpconf;
 158 static g_orphan_t g_part_orphan;
 159 static g_spoiled_t g_part_spoiled;
 160 static g_start_t g_part_start;
 161 static g_resize_t g_part_resize;
 162 static g_ioctl_t g_part_ioctl;
 163
 164 static struct g_class g_part_class = {
 165         .name = "PART",
 166         .version = G_VERSION,
 167         /* Class methods. */
 168         .ctlreq = g_part_ctlreq,
 169         .destroy_geom = g_part_destroy_geom,
 170         .fini = g_part_fini,
 171         .init = g_part_init,
 172         .taste = g_part_taste,
 173         /* Geom methods. */
 174         .access = g_part_access,
 175         .dumpconf = g_part_dumpconf,
 176         .orphan = g_part_orphan,
 177         .spoiled = g_part_spoiled,
 178         .start = g_part_start,
 179         .resize = g_part_resize,
 180         .ioctl = g_part_ioctl,
 181 };
 182
 183 DECLARE_GEOM_CLASS(g_part_class, g_part);
 184 MODULE_VERSION(g_part, 0);
 185
 186 /*
 187  * Support functions.
 188  */
 189
 190 static void g_part_wither(struct g_geom *, int);
 191
 192 const char *
 193 g_part_alias_name(enum g_part_alias alias)
 194 {
 195         int i;
 196
 197         for (i = 0; i < G_PART_ALIAS_COUNT; i++) {
 198                 if (g_part_alias_list[i].alias != alias)
 199                         continue;
 200                 return (g_part_alias_list[i].lexeme);
 201         }
 202
 203         return (NULL);
 204 }
 205
 206 void
 207 g_part_geometry_heads(off_t blocks, u_int sectors, off_t *bestchs,
 208     u_int *bestheads)
 209 {
 210         static u_int candidate_heads[] = { 1, 2, 16, 32, 64, 128, 255, 0 };
 211         off_t chs, cylinders;
 212         u_int heads;
 213         int idx;
 214
 215         *bestchs = 0;
 216         *bestheads = 0;
 217         for (idx = 0; candidate_heads[idx] != 0; idx++) {
 218                 heads = candidate_heads[idx];
 219                 cylinders = blocks / heads / sectors;
 220                 if (cylinders < heads || cylinders < sectors)
 221                         break;
 222                 if (cylinders > 1023)
 223                         continue;
 224                 chs = cylinders * heads * sectors;
 225                 if (chs > *bestchs || (chs == *bestchs && *bestheads == 1)) {
 226                         *bestchs = chs;
 227                         *bestheads = heads;
 228                 }
 229         }
 230 }
 231
 232 static void
 233 g_part_geometry(struct g_part_table *table, struct g_consumer *cp,
 234     off_t blocks)
 235 {
 236         static u_int candidate_sectors[] = { 1, 9, 17, 33, 63, 0 };
 237         off_t chs, bestchs;
 238         u_int heads, sectors;
 239         int idx;
 240
 241         if (g_getattr("GEOM::fwsectors", cp, &sectors) != 0 || sectors == 0 ||
 242             g_getattr("GEOM::fwheads", cp, &heads) != 0 || heads == 0) {
 243                 table->gpt_fixgeom = 0;
 244                 table->gpt_heads = 0;
 245                 table->gpt_sectors = 0;
 246                 bestchs = 0;
 247                 for (idx = 0; candidate_sectors[idx] != 0; idx++) {
 248                         sectors = candidate_sectors[idx];
 249                         g_part_geometry_heads(blocks, sectors, &chs, &heads);
 250                         if (chs == 0)
 251                                 continue;
 252                         /*
 253                          * Prefer a geometry with sectors > 1, but only if
 254                          * it doesn't bump down the number of heads to 1.
 255                          */
 256                         if (chs > bestchs || (chs == bestchs && heads > 1 &&
 257                             table->gpt_sectors == 1)) {
 258                                 bestchs = chs;
 259                                 table->gpt_heads = heads;
 260                                 table->gpt_sectors = sectors;
 261                         }
 262                 }
 263                 /*
 264                  * If we didn't find a geometry at all, then the disk is
 265                  * too big. This means we can use the maximum number of
 266                  * heads and sectors.
 267                  */
 268                 if (bestchs == 0) {
 269                         table->gpt_heads = 255;
 270                         table->gpt_sectors = 63;
 271                 }
 272         } else {
 273                 table->gpt_fixgeom = 1;
 274                 table->gpt_heads = heads;
 275                 table->gpt_sectors = sectors;
 276         }
 277 }
 278
 279 static void
 280 g_part_get_physpath_done(struct bio *bp)
 281 {
 282         struct g_geom *gp;
 283         struct g_part_entry *entry;
 284         struct g_part_table *table;
 285         struct g_provider *pp;
 286         struct bio *pbp;
 287
 288         pbp = bp->bio_parent;
 289         pp = pbp->bio_to;
 290         gp = pp->geom;
 291         table = gp->softc;
 292         entry = pp->private;
 293
 294         if (bp->bio_error == 0) {
 295                 char *end;
 296                 size_t len, remainder;
 297                 len = strlcat(bp->bio_data, "/", bp->bio_length);
 298                 if (len < bp->bio_length) {
 299                         end = bp->bio_data + len;
 300                         remainder = bp->bio_length - len;
 301                         G_PART_NAME(table, entry, end, remainder);
 302                 }
 303         }
 304         g_std_done(bp);
 305 }
 306
 307
 308 #define DPRINTF(...)    if (bootverbose) {      \
 309         printf("GEOM_PART: " __VA_ARGS__);      \
 310 }
 311
 312 static int
 313 g_part_check_integrity(struct g_part_table *table, struct g_consumer *cp)
 314 {
 315         struct g_part_entry *e1, *e2;
 316         struct g_provider *pp;
 317         off_t offset;
 318         int failed;
 319
 320         failed = 0;
 321         pp = cp->provider;
 322         if (table->gpt_last < table->gpt_first) {
 323                 DPRINTF("last LBA is below first LBA: %jd < %jd\n",
 324                     (intmax_t)table->gpt_last, (intmax_t)table->gpt_first);
 325                 failed++;
 326         }
 327         if (table->gpt_last > pp->mediasize / pp->sectorsize - 1) {
 328                 DPRINTF("last LBA extends beyond mediasize: "
 329                     "%jd > %jd\n", (intmax_t)table->gpt_last,
 330                     (intmax_t)pp->mediasize / pp->sectorsize - 1);
 331                 failed++;
 332         }
 333         LIST_FOREACH(e1, &table->gpt_entry, gpe_entry) {
 334                 if (e1->gpe_deleted || e1->gpe_internal)
 335                         continue;
 336                 if (e1->gpe_start < table->gpt_first) {
 337                         DPRINTF("partition %d has start offset below first "
 338                             "LBA: %jd < %jd\n", e1->gpe_index,
 339                             (intmax_t)e1->gpe_start,
 340                             (intmax_t)table->gpt_first);
 341                         failed++;
 342                 }
 343                 if (e1->gpe_start > table->gpt_last) {
 344                         DPRINTF("partition %d has start offset beyond last "
 345                             "LBA: %jd > %jd\n", e1->gpe_index,
 346                             (intmax_t)e1->gpe_start,
 347                             (intmax_t)table->gpt_last);
 348                         failed++;
 349                 }
 350                 if (e1->gpe_end < e1->gpe_start) {
 351                         DPRINTF("partition %d has end offset below start "
 352                             "offset: %jd < %jd\n", e1->gpe_index,
 353                             (intmax_t)e1->gpe_end,
 354                             (intmax_t)e1->gpe_start);
 355                         failed++;
 356                 }
 357                 if (e1->gpe_end > table->gpt_last) {
 358                         DPRINTF("partition %d has end offset beyond last "
 359                             "LBA: %jd > %jd\n", e1->gpe_index,
 360                             (intmax_t)e1->gpe_end,
 361                             (intmax_t)table->gpt_last);
 362                         failed++;
 363                 }
 364                 if (pp->stripesize > 0) {
 365                         offset = e1->gpe_start * pp->sectorsize;
 366                         if (e1->gpe_offset > offset)
 367                                 offset = e1->gpe_offset;
 368                         if ((offset + pp->stripeoffset) % pp->stripesize) {
 369                                 DPRINTF("partition %d on (%s, %s) is not "
 370                                     "aligned on %ju bytes\n", e1->gpe_index,
 371                                     pp->name, table->gpt_scheme->name,
 372                                     (uintmax_t)pp->stripesize);
 373                                 /* Don't treat this as a critical failure */
 374                         }
 375                 }
 376                 e2 = e1;
 377                 while ((e2 = LIST_NEXT(e2, gpe_entry)) != NULL) {
 378                         if (e2->gpe_deleted || e2->gpe_internal)
 379                                 continue;
 380                         if (e1->gpe_start >= e2->gpe_start &&
 381                             e1->gpe_start <= e2->gpe_end) {
 382                                 DPRINTF("partition %d has start offset inside "
 383                                     "partition %d: start[%d] %jd >= start[%d] "
 384                                     "%jd <= end[%d] %jd\n",
 385                                     e1->gpe_index, e2->gpe_index,
 386                                     e2->gpe_index, (intmax_t)e2->gpe_start,
 387                                     e1->gpe_index, (intmax_t)e1->gpe_start,
 388                                     e2->gpe_index, (intmax_t)e2->gpe_end);
 389                                 failed++;
 390                         }
 391                         if (e1->gpe_end >= e2->gpe_start &&
 392                             e1->gpe_end <= e2->gpe_end) {
 393                                 DPRINTF("partition %d has end offset inside "
 394                                     "partition %d: start[%d] %jd >= end[%d] "
 395                                     "%jd <= end[%d] %jd\n",
 396                                     e1->gpe_index, e2->gpe_index,
 397                                     e2->gpe_index, (intmax_t)e2->gpe_start,
 398                                     e1->gpe_index, (intmax_t)e1->gpe_end,
 399                                     e2->gpe_index, (intmax_t)e2->gpe_end);
 400                                 failed++;
 401                         }
 402                         if (e1->gpe_start < e2->gpe_start &&
 403                             e1->gpe_end > e2->gpe_end) {
 404                                 DPRINTF("partition %d contains partition %d: "
 405                                     "start[%d] %jd > start[%d] %jd, end[%d] "
 406                                     "%jd < end[%d] %jd\n",
 407                                     e1->gpe_index, e2->gpe_index,
 408                                     e1->gpe_index, (intmax_t)e1->gpe_start,
 409                                     e2->gpe_index, (intmax_t)e2->gpe_start,
 410                                     e2->gpe_index, (intmax_t)e2->gpe_end,
 411                                     e1->gpe_index, (intmax_t)e1->gpe_end);
 412                                 failed++;
 413                         }
 414                 }
 415         }
 416         if (failed != 0) {
 417                 printf("GEOM_PART: integrity check failed (%s, %s)\n",
 418                     pp->name, table->gpt_scheme->name);
 419                 if (check_integrity != 0)
 420                         return (EINVAL);
 421                 table->gpt_corrupt = 1;
 422         }
 423         return (0);
 424 }
 425 #undef  DPRINTF
 426
 427 struct g_part_entry *
 428 g_part_new_entry(struct g_part_table *table, int index, quad_t start,
 429     quad_t end)
 430 {
 431         struct g_part_entry *entry, *last;
 432
 433         last = NULL;
 434         LIST_FOREACH(entry, &table->gpt_entry, gpe_entry) {
 435                 if (entry->gpe_index == index)
 436                         break;
 437                 if (entry->gpe_index > index) {
 438                         entry = NULL;
 439                         break;
 440                 }
 441                 last = entry;
 442         }
 443         if (entry == NULL) {
 444                 entry = g_malloc(table->gpt_scheme->gps_entrysz,
 445                     M_WAITOK | M_ZERO);
 446                 entry->gpe_index = index;
 447                 if (last == NULL)
 448                         LIST_INSERT_HEAD(&table->gpt_entry, entry, gpe_entry);
 449                 else
 450                         LIST_INSERT_AFTER(last, entry, gpe_entry);
 451         } else
 452                 entry->gpe_offset = 0;
 453         entry->gpe_start = start;
 454         entry->gpe_end = end;
 455         return (entry);
 456 }
 457
 458 static void
 459 g_part_new_provider(struct g_geom *gp, struct g_part_table *table,
 460     struct g_part_entry *entry)
 461 {
 462         struct g_consumer *cp;
 463         struct g_provider *pp;
 464         struct sbuf *sb;
 465         struct g_geom_alias *gap;
 466         off_t offset;
 467
 468         cp = LIST_FIRST(&gp->consumer);
 469         pp = cp->provider;
 470
 471         offset = entry->gpe_start * pp->sectorsize;
 472         if (entry->gpe_offset < offset)
 473                 entry->gpe_offset = offset;
 474
 475         if (entry->gpe_pp == NULL) {
 476                 /*
 477                  * Add aliases to the geom before we create the provider so that
 478                  * geom_dev can taste it with all the aliases in place so all
 479                  * the aliased dev_t instances get created for each partition
 480                  * (eg foo5p7 gets created for bar5p7 when foo is an alias of bar).
 481                  */
 482                 LIST_FOREACH(gap, &table->gpt_gp->aliases, ga_next) {
 483                         sb = sbuf_new_auto();
 484                         G_PART_FULLNAME(table, entry, sb, gap->ga_alias);
 485                         sbuf_finish(sb);
 486                         g_geom_add_alias(gp, sbuf_data(sb));
 487                         sbuf_delete(sb);
 488                 }
 489                 sb = sbuf_new_auto();
 490                 G_PART_FULLNAME(table, entry, sb, gp->name);
 491                 sbuf_finish(sb);
 492                 entry->gpe_pp = g_new_providerf(gp, "%s", sbuf_data(sb));
 493                 sbuf_delete(sb);
 494                 entry->gpe_pp->flags |= G_PF_DIRECT_SEND | G_PF_DIRECT_RECEIVE;
 495                 entry->gpe_pp->private = entry;         /* Close the circle. */
 496         }
 497         entry->gpe_pp->index = entry->gpe_index - 1;    /* index is 1-based. */
 498         entry->gpe_pp->mediasize = (entry->gpe_end - entry->gpe_start + 1) *
 499             pp->sectorsize;
 500         entry->gpe_pp->mediasize -= entry->gpe_offset - offset;
 501         entry->gpe_pp->sectorsize = pp->sectorsize;
 502         entry->gpe_pp->stripesize = pp->stripesize;
 503         entry->gpe_pp->stripeoffset = pp->stripeoffset + entry->gpe_offset;
 504         if (pp->stripesize > 0)
 505                 entry->gpe_pp->stripeoffset %= pp->stripesize;
 506         entry->gpe_pp->flags |= pp->flags & G_PF_ACCEPT_UNMAPPED;
 507         g_error_provider(entry->gpe_pp, 0);
 508 }
 509
 510 static struct g_geom*
 511 g_part_find_geom(const char *name)
 512 {
 513         struct g_geom *gp;
 514         LIST_FOREACH(gp, &g_part_class.geom, geom) {
 515                 if ((gp->flags & G_GEOM_WITHER) == 0 &&
 516                     strcmp(name, gp->name) == 0)
 517                         break;
 518         }
 519         return (gp);
 520 }
 521
 522 static int
 523 g_part_parm_geom(struct gctl_req *req, const char *name, struct g_geom **v)
 524 {
 525         struct g_geom *gp;
 526         const char *gname;
 527
 528         gname = gctl_get_asciiparam(req, name);
 529         if (gname == NULL)
 530                 return (ENOATTR);
 531         if (strncmp(gname, _PATH_DEV, sizeof(_PATH_DEV) - 1) == 0)
 532                 gname += sizeof(_PATH_DEV) - 1;
 533         gp = g_part_find_geom(gname);
 534         if (gp == NULL) {
 535                 gctl_error(req, "%d %s '%s'", EINVAL, name, gname);
 536                 return (EINVAL);
 537         }
 538         *v = gp;
 539         return (0);
 540 }
 541
 542 static int
 543 g_part_parm_provider(struct gctl_req *req, const char *name,
 544     struct g_provider **v)
 545 {
 546         struct g_provider *pp;
 547         const char *pname;
 548
 549         pname = gctl_get_asciiparam(req, name);
 550         if (pname == NULL)
 551                 return (ENOATTR);
 552         if (strncmp(pname, _PATH_DEV, sizeof(_PATH_DEV) - 1) == 0)
 553                 pname += sizeof(_PATH_DEV) - 1;
 554         pp = g_provider_by_name(pname);
 555         if (pp == NULL) {
 556                 gctl_error(req, "%d %s '%s'", EINVAL, name, pname);
 557                 return (EINVAL);
 558         }
 559         *v = pp;
 560         return (0);
 561 }
 562
 563 static int
 564 g_part_parm_quad(struct gctl_req *req, const char *name, quad_t *v)
 565 {
 566         const char *p;
 567         char *x;
 568         quad_t q;
 569
 570         p = gctl_get_asciiparam(req, name);
 571         if (p == NULL)
 572                 return (ENOATTR);
 573         q = strtoq(p, &x, 0);
 574         if (*x != '\0' || q < 0) {
 575                 gctl_error(req, "%d %s '%s'", EINVAL, name, p);
 576                 return (EINVAL);
 577         }
 578         *v = q;
 579         return (0);
 580 }
 581
 582 static int
 583 g_part_parm_scheme(struct gctl_req *req, const char *name,
 584     struct g_part_scheme **v)
 585 {
 586         struct g_part_scheme *s;
 587         const char *p;
 588
 589         p = gctl_get_asciiparam(req, name);
 590         if (p == NULL)
 591                 return (ENOATTR);
 592         TAILQ_FOREACH(s, &g_part_schemes, scheme_list) {
 593                 if (s == &g_part_null_scheme)
 594                         continue;
 595                 if (!strcasecmp(s->name, p))
 596                         break;
 597         }
 598         if (s == NULL) {
 599                 gctl_error(req, "%d %s '%s'", EINVAL, name, p);
 600                 return (EINVAL);
 601         }
 602         *v = s;
 603         return (0);
 604 }
 605
 606 static int
 607 g_part_parm_str(struct gctl_req *req, const char *name, const char **v)
 608 {
 609         const char *p;
 610
 611         p = gctl_get_asciiparam(req, name);
 612         if (p == NULL)
 613                 return (ENOATTR);
 614         /* An empty label is always valid. */
 615         if (strcmp(name, "label") != 0 && p[0] == '\0') {
 616                 gctl_error(req, "%d %s '%s'", EINVAL, name, p);
 617                 return (EINVAL);
 618         }
 619         *v = p;
 620         return (0);
 621 }
 622
 623 static int
 624 g_part_parm_intmax(struct gctl_req *req, const char *name, u_int *v)
 625 {
 626         const intmax_t *p;
 627         int size;
 628
 629         p = gctl_get_param(req, name, &size);
 630         if (p == NULL)
 631                 return (ENOATTR);
 632         if (size != sizeof(*p) || *p < 0 || *p > INT_MAX) {
 633                 gctl_error(req, "%d %s '%jd'", EINVAL, name, *p);
 634                 return (EINVAL);
 635         }
 636         *v = (u_int)*p;
 637         return (0);
 638 }
 639
 640 static int
 641 g_part_parm_uint32(struct gctl_req *req, const char *name, u_int *v)
 642 {
 643         const uint32_t *p;
 644         int size;
 645
 646         p = gctl_get_param(req, name, &size);
 647         if (p == NULL)
 648                 return (ENOATTR);
 649         if (size != sizeof(*p) || *p > INT_MAX) {
 650                 gctl_error(req, "%d %s '%u'", EINVAL, name, (unsigned int)*p);
 651                 return (EINVAL);
 652         }
 653         *v = (u_int)*p;
 654         return (0);
 655 }
 656
 657 static int
 658 g_part_parm_bootcode(struct gctl_req *req, const char *name, const void **v,
 659     unsigned int *s)
 660 {
 661         const void *p;
 662         int size;
 663
 664         p = gctl_get_param(req, name, &size);
 665         if (p == NULL)
 666                 return (ENOATTR);
 667         *v = p;
 668         *s = size;
 669         return (0);
 670 }
 671
 672 static int
 673 g_part_probe(struct g_geom *gp, struct g_consumer *cp, int depth)
 674 {
 675         struct g_part_scheme *iter, *scheme;
 676         struct g_part_table *table;
 677         int pri, probe;
 678
 679         table = gp->softc;
 680         scheme = (table != NULL) ? table->gpt_scheme : NULL;
 681         pri = (scheme != NULL) ? G_PART_PROBE(table, cp) : INT_MIN;
 682         if (pri == 0)
 683                 goto done;
 684         if (pri > 0) {  /* error */
 685                 scheme = NULL;
 686                 pri = INT_MIN;
 687         }
 688
 689         TAILQ_FOREACH(iter, &g_part_schemes, scheme_list) {
 690                 if (iter == &g_part_null_scheme)
 691                         continue;
 692                 table = (void *)kobj_create((kobj_class_t)iter, M_GEOM,
 693                     M_WAITOK);
 694                 table->gpt_gp = gp;
 695                 table->gpt_scheme = iter;
 696                 table->gpt_depth = depth;
 697                 probe = G_PART_PROBE(table, cp);
 698                 if (probe <= 0 && probe > pri) {
 699                         pri = probe;
 700                         scheme = iter;
 701                         if (gp->softc != NULL)
 702                                 kobj_delete((kobj_t)gp->softc, M_GEOM);
 703                         gp->softc = table;
 704                         if (pri == 0)
 705                                 goto done;
 706                 } else
 707                         kobj_delete((kobj_t)table, M_GEOM);
 708         }
 709
 710 done:
 711         return ((scheme == NULL) ? ENXIO : 0);
 712 }
 713
 714 /*
 715  * Control request functions.
 716  */
 717
 718 static int
 719 g_part_ctl_add(struct gctl_req *req, struct g_part_parms *gpp)
 720 {
 721         struct g_geom *gp;
 722         struct g_provider *pp;
 723         struct g_part_entry *delent, *last, *entry;
 724         struct g_part_table *table;
 725         struct sbuf *sb;
 726         quad_t end;
 727         unsigned int index;
 728         int error;
 729
 730         gp = gpp->gpp_geom;
 731         G_PART_TRACE((G_T_TOPOLOGY, "%s(%s)", __func__, gp->name));
 732         g_topology_assert();
 733
 734         pp = LIST_FIRST(&gp->consumer)->provider;
 735         table = gp->softc;
 736         end = gpp->gpp_start + gpp->gpp_size - 1;
 737
 738         if (gpp->gpp_start < table->gpt_first ||
 739             gpp->gpp_start > table->gpt_last) {
 740                 gctl_error(req, "%d start '%jd'", EINVAL,
 741                     (intmax_t)gpp->gpp_start);
 742                 return (EINVAL);
 743         }
 744         if (end < gpp->gpp_start || end > table->gpt_last) {
 745                 gctl_error(req, "%d size '%jd'", EINVAL,
 746                     (intmax_t)gpp->gpp_size);
 747                 return (EINVAL);
 748         }
 749         if (gpp->gpp_index > table->gpt_entries) {
 750                 gctl_error(req, "%d index '%d'", EINVAL, gpp->gpp_index);
 751                 return (EINVAL);
 752         }
 753
 754         delent = last = NULL;
 755         index = (gpp->gpp_index > 0) ? gpp->gpp_index : 1;
 756         LIST_FOREACH(entry, &table->gpt_entry, gpe_entry) {
 757                 if (entry->gpe_deleted) {
 758                         if (entry->gpe_index == index)
 759                                 delent = entry;
 760                         continue;
 761                 }
 762                 if (entry->gpe_index == index)
 763                         index = entry->gpe_index + 1;
 764                 if (entry->gpe_index < index)
 765                         last = entry;
 766                 if (entry->gpe_internal)
 767                         continue;
 768                 if (gpp->gpp_start >= entry->gpe_start &&
 769                     gpp->gpp_start <= entry->gpe_end) {
 770                         gctl_error(req, "%d start '%jd'", ENOSPC,
 771                             (intmax_t)gpp->gpp_start);
 772                         return (ENOSPC);
 773                 }
 774                 if (end >= entry->gpe_start && end <= entry->gpe_end) {
 775                         gctl_error(req, "%d end '%jd'", ENOSPC, (intmax_t)end);
 776                         return (ENOSPC);
 777                 }
 778                 if (gpp->gpp_start < entry->gpe_start && end > entry->gpe_end) {
 779                         gctl_error(req, "%d size '%jd'", ENOSPC,
 780                             (intmax_t)gpp->gpp_size);
 781                         return (ENOSPC);
 782                 }
 783         }
 784         if (gpp->gpp_index > 0 && index != gpp->gpp_index) {
 785                 gctl_error(req, "%d index '%d'", EEXIST, gpp->gpp_index);
 786                 return (EEXIST);
 787         }
 788         if (index > table->gpt_entries) {
 789                 gctl_error(req, "%d index '%d'", ENOSPC, index);
 790                 return (ENOSPC);
 791         }
 792
 793         entry = (delent == NULL) ? g_malloc(table->gpt_scheme->gps_entrysz,
 794             M_WAITOK | M_ZERO) : delent;
 795         entry->gpe_index = index;
 796         entry->gpe_start = gpp->gpp_start;
 797         entry->gpe_end = end;
 798         error = G_PART_ADD(table, entry, gpp);
 799         if (error) {
 800                 gctl_error(req, "%d", error);
 801                 if (delent == NULL)
 802                         g_free(entry);
 803                 return (error);
 804         }
 805         if (delent == NULL) {
 806                 if (last == NULL)
 807                         LIST_INSERT_HEAD(&table->gpt_entry, entry, gpe_entry);
 808                 else
 809                         LIST_INSERT_AFTER(last, entry, gpe_entry);
 810                 entry->gpe_created = 1;
 811         } else {
 812                 entry->gpe_deleted = 0;
 813                 entry->gpe_modified = 1;
 814         }
 815         g_part_new_provider(gp, table, entry);
 816
 817         /* Provide feedback if so requested. */
 818         if (gpp->gpp_parms & G_PART_PARM_OUTPUT) {
 819                 sb = sbuf_new_auto();
 820                 G_PART_FULLNAME(table, entry, sb, gp->name);
 821                 if (pp->stripesize > 0 && entry->gpe_pp->stripeoffset != 0)
 822                         sbuf_printf(sb, " added, but partition is not "
 823                             "aligned on %ju bytes\n", (uintmax_t)pp->stripesize);
 824                 else
 825                         sbuf_cat(sb, " added\n");
 826                 sbuf_finish(sb);
 827                 gctl_set_param(req, "output", sbuf_data(sb), sbuf_len(sb) + 1);
 828                 sbuf_delete(sb);
 829         }
 830         return (0);
 831 }
 832
 833 static int
 834 g_part_ctl_bootcode(struct gctl_req *req, struct g_part_parms *gpp)
 835 {
 836         struct g_geom *gp;
 837         struct g_part_table *table;
 838         struct sbuf *sb;
 839         int error, sz;
 840
 841         gp = gpp->gpp_geom;
 842         G_PART_TRACE((G_T_TOPOLOGY, "%s(%s)", __func__, gp->name));
 843         g_topology_assert();
 844
 845         table = gp->softc;
 846         sz = table->gpt_scheme->gps_bootcodesz;
 847         if (sz == 0) {
 848                 error = ENODEV;
 849                 goto fail;
 850         }
 851         if (gpp->gpp_codesize > sz) {
 852                 error = EFBIG;
 853                 goto fail;
 854         }
 855
 856         error = G_PART_BOOTCODE(table, gpp);
 857         if (error)
 858                 goto fail;
 859
 860         /* Provide feedback if so requested. */
 861         if (gpp->gpp_parms & G_PART_PARM_OUTPUT) {
 862                 sb = sbuf_new_auto();
 863                 sbuf_printf(sb, "bootcode written to %s\n", gp->name);
 864                 sbuf_finish(sb);
 865                 gctl_set_param(req, "output", sbuf_data(sb), sbuf_len(sb) + 1);
 866                 sbuf_delete(sb);
 867         }
 868         return (0);
 869
 870  fail:
 871         gctl_error(req, "%d", error);
 872         return (error);
 873 }
 874
 875 static int
 876 g_part_ctl_commit(struct gctl_req *req, struct g_part_parms *gpp)
 877 {
 878         struct g_consumer *cp;
 879         struct g_geom *gp;
 880         struct g_provider *pp;
 881         struct g_part_entry *entry, *tmp;
 882         struct g_part_table *table;
 883         char *buf;
 884         int error, i;
 885
 886         gp = gpp->gpp_geom;
 887         G_PART_TRACE((G_T_TOPOLOGY, "%s(%s)", __func__, gp->name));
 888         g_topology_assert();
 889
 890         table = gp->softc;
 891         if (!table->gpt_opened) {
 892                 gctl_error(req, "%d", EPERM);
 893                 return (EPERM);
 894         }
 895
 896         g_topology_unlock();
 897
 898         cp = LIST_FIRST(&gp->consumer);
 899         if ((table->gpt_smhead | table->gpt_smtail) != 0) {
 900                 pp = cp->provider;
 901                 buf = g_malloc(pp->sectorsize, M_WAITOK | M_ZERO);
 902                 while (table->gpt_smhead != 0) {
 903                         i = ffs(table->gpt_smhead) - 1;
 904                         error = g_write_data(cp, i * pp->sectorsize, buf,
 905                             pp->sectorsize);
 906                         if (error) {
 907                                 g_free(buf);
 908                                 goto fail;
 909                         }
 910                         table->gpt_smhead &= ~(1 << i);
 911                 }
 912                 while (table->gpt_smtail != 0) {
 913                         i = ffs(table->gpt_smtail) - 1;
 914                         error = g_write_data(cp, pp->mediasize - (i + 1) *
 915                             pp->sectorsize, buf, pp->sectorsize);
 916                         if (error) {
 917                                 g_free(buf);
 918                                 goto fail;
 919                         }
 920                         table->gpt_smtail &= ~(1 << i);
 921                 }
 922                 g_free(buf);
 923         }
 924
 925         if (table->gpt_scheme == &g_part_null_scheme) {
 926                 g_topology_lock();
 927                 g_access(cp, -1, -1, -1);
 928                 g_part_wither(gp, ENXIO);
 929                 return (0);
 930         }
 931
 932         error = G_PART_WRITE(table, cp);
 933         if (error)
 934                 goto fail;
 935
 936         LIST_FOREACH_SAFE(entry, &table->gpt_entry, gpe_entry, tmp) {
 937                 if (!entry->gpe_deleted) {
 938                         /* Notify consumers that provider might be changed. */
 939                         if (entry->gpe_modified && (
 940                             entry->gpe_pp->acw + entry->gpe_pp->ace +
 941                             entry->gpe_pp->acr) == 0)
 942                                 g_media_changed(entry->gpe_pp, M_NOWAIT);
 943                         entry->gpe_created = 0;
 944                         entry->gpe_modified = 0;
 945                         continue;
 946                 }
 947                 LIST_REMOVE(entry, gpe_entry);
 948                 g_free(entry);
 949         }
 950         table->gpt_created = 0;
 951         table->gpt_opened = 0;
 952
 953         g_topology_lock();
 954         g_access(cp, -1, -1, -1);
 955         return (0);
 956
 957 fail:
 958         g_topology_lock();
 959         gctl_error(req, "%d", error);
 960         return (error);
 961 }
 962
 963 static int
 964 g_part_ctl_create(struct gctl_req *req, struct g_part_parms *gpp)
 965 {
 966         struct g_consumer *cp;
 967         struct g_geom *gp;
 968         struct g_provider *pp;
 969         struct g_part_scheme *scheme;
 970         struct g_part_table *null, *table;
 971         struct sbuf *sb;
 972         int attr, error;
 973
 974         pp = gpp->gpp_provider;
 975         scheme = gpp->gpp_scheme;
 976         G_PART_TRACE((G_T_TOPOLOGY, "%s(%s)", __func__, pp->name));
 977         g_topology_assert();
 978
 979         /* Check that there isn't already a g_part geom on the provider. */
 980         gp = g_part_find_geom(pp->name);
 981         if (gp != NULL) {
 982                 null = gp->softc;
 983                 if (null->gpt_scheme != &g_part_null_scheme) {
 984                         gctl_error(req, "%d geom '%s'", EEXIST, pp->name);
 985                         return (EEXIST);
 986                 }
 987         } else
 988                 null = NULL;
 989
 990         if ((gpp->gpp_parms & G_PART_PARM_ENTRIES) &&
 991             (gpp->gpp_entries < scheme->gps_minent ||
 992              gpp->gpp_entries > scheme->gps_maxent)) {
 993                 gctl_error(req, "%d entries '%d'", EINVAL, gpp->gpp_entries);
 994                 return (EINVAL);
 995         }
 996
 997         if (null == NULL)
 998                 gp = g_new_geomf(&g_part_class, "%s", pp->name);
 999         gp->softc = kobj_create((kobj_class_t)gpp->gpp_scheme, M_GEOM,
1000             M_WAITOK);
1001         table = gp->softc;
1002         table->gpt_gp = gp;
1003         table->gpt_scheme = gpp->gpp_scheme;
1004         table->gpt_entries = (gpp->gpp_parms & G_PART_PARM_ENTRIES) ?
1005             gpp->gpp_entries : scheme->gps_minent;
1006         LIST_INIT(&table->gpt_entry);
1007         if (null == NULL) {
1008                 cp = g_new_consumer(gp);
1009                 cp->flags |= G_CF_DIRECT_SEND | G_CF_DIRECT_RECEIVE;
1010                 error = g_attach(cp, pp);
1011                 if (error == 0)
1012                         error = g_access(cp, 1, 1, 1);
1013                 if (error != 0) {
1014                         g_part_wither(gp, error);
1015                         gctl_error(req, "%d geom '%s'", error, pp->name);
1016                         return (error);
1017                 }
1018                 table->gpt_opened = 1;
1019         } else {
1020                 cp = LIST_FIRST(&gp->consumer);
1021                 table->gpt_opened = null->gpt_opened;
1022                 table->gpt_smhead = null->gpt_smhead;
1023                 table->gpt_smtail = null->gpt_smtail;
1024         }
1025
1026         g_topology_unlock();
1027
1028         /* Make sure the provider has media. */
1029         if (pp->mediasize == 0 || pp->sectorsize == 0) {
1030                 error = ENODEV;
1031                 goto fail;
1032         }
1033
1034         /* Make sure we can nest and if so, determine our depth. */
1035         error = g_getattr("PART::isleaf", cp, &attr);
1036         if (!error && attr) {
1037                 error = ENODEV;
1038                 goto fail;
1039         }
1040         error = g_getattr("PART::depth", cp, &attr);
1041         table->gpt_depth = (!error) ? attr + 1 : 0;
1042
1043         /*
1044          * Synthesize a disk geometry. Some partitioning schemes
1045          * depend on it and since some file systems need it even
1046          * when the partitition scheme doesn't, we do it here in
1047          * scheme-independent code.
1048          */
1049         g_part_geometry(table, cp, pp->mediasize / pp->sectorsize);
1050
1051         error = G_PART_CREATE(table, gpp);
1052         if (error)
1053                 goto fail;
1054
1055         g_topology_lock();
1056
1057         table->gpt_created = 1;
1058         if (null != NULL)
1059                 kobj_delete((kobj_t)null, M_GEOM);
1060
1061         /*
1062          * Support automatic commit by filling in the gpp_geom
1063          * parameter.
1064          */
1065         gpp->gpp_parms |= G_PART_PARM_GEOM;
1066         gpp->gpp_geom = gp;
1067
1068         /* Provide feedback if so requested. */
1069         if (gpp->gpp_parms & G_PART_PARM_OUTPUT) {
1070                 sb = sbuf_new_auto();
1071                 sbuf_printf(sb, "%s created\n", gp->name);
1072                 sbuf_finish(sb);
1073                 gctl_set_param(req, "output", sbuf_data(sb), sbuf_len(sb) + 1);
1074                 sbuf_delete(sb);
1075         }
1076         return (0);
1077
1078 fail:
1079         g_topology_lock();
1080         if (null == NULL) {
1081                 g_access(cp, -1, -1, -1);
1082                 g_part_wither(gp, error);
1083         } else {
1084                 kobj_delete((kobj_t)gp->softc, M_GEOM);
1085                 gp->softc = null;
1086         }
1087         gctl_error(req, "%d provider", error);
1088         return (error);
1089 }
1090
1091 static int
1092 g_part_ctl_delete(struct gctl_req *req, struct g_part_parms *gpp)
1093 {
1094         struct g_geom *gp;
1095         struct g_provider *pp;
1096         struct g_part_entry *entry;
1097         struct g_part_table *table;
1098         struct sbuf *sb;
1099
1100         gp = gpp->gpp_geom;
1101         G_PART_TRACE((G_T_TOPOLOGY, "%s(%s)", __func__, gp->name));
1102         g_topology_assert();
1103
1104         table = gp->softc;
1105
1106         LIST_FOREACH(entry, &table->gpt_entry, gpe_entry) {
1107                 if (entry->gpe_deleted || entry->gpe_internal)
1108                         continue;
1109                 if (entry->gpe_index == gpp->gpp_index)
1110                         break;
1111         }
1112         if (entry == NULL) {
1113                 gctl_error(req, "%d index '%d'", ENOENT, gpp->gpp_index);
1114                 return (ENOENT);
1115         }
1116
1117         pp = entry->gpe_pp;
1118         if (pp != NULL) {
1119                 if (pp->acr > 0 || pp->acw > 0 || pp->ace > 0) {
1120                         gctl_error(req, "%d", EBUSY);
1121                         return (EBUSY);
1122                 }
1123
1124                 pp->private = NULL;
1125                 entry->gpe_pp = NULL;
1126         }
1127
1128         if (pp != NULL)
1129                 g_wither_provider(pp, ENXIO);
1130
1131         /* Provide feedback if so requested. */
1132         if (gpp->gpp_parms & G_PART_PARM_OUTPUT) {
1133                 sb = sbuf_new_auto();
1134                 G_PART_FULLNAME(table, entry, sb, gp->name);
1135                 sbuf_cat(sb, " deleted\n");
1136                 sbuf_finish(sb);
1137                 gctl_set_param(req, "output", sbuf_data(sb), sbuf_len(sb) + 1);
1138                 sbuf_delete(sb);
1139         }
1140
1141         if (entry->gpe_created) {
1142                 LIST_REMOVE(entry, gpe_entry);
1143                 g_free(entry);
1144         } else {
1145                 entry->gpe_modified = 0;
1146                 entry->gpe_deleted = 1;
1147         }
1148         return (0);
1149 }
1150
1151 static int
1152 g_part_ctl_destroy(struct gctl_req *req, struct g_part_parms *gpp)
1153 {
1154         struct g_consumer *cp;
1155         struct g_geom *gp;
1156         struct g_provider *pp;
1157         struct g_part_entry *entry, *tmp;
1158         struct g_part_table *null, *table;
1159         struct sbuf *sb;
1160         int error;
1161
1162         gp = gpp->gpp_geom;
1163         G_PART_TRACE((G_T_TOPOLOGY, "%s(%s)", __func__, gp->name));
1164         g_topology_assert();
1165
1166         table = gp->softc;
1167         /* Check for busy providers. */
1168         LIST_FOREACH(entry, &table->gpt_entry, gpe_entry) {
1169                 if (entry->gpe_deleted || entry->gpe_internal)
1170                         continue;
1171                 if (gpp->gpp_force) {
1172                         pp = entry->gpe_pp;
1173                         if (pp == NULL)
1174                                 continue;
1175                         if (pp->acr == 0 && pp->acw == 0 && pp->ace == 0)
1176                                 continue;
1177                 }
1178                 gctl_error(req, "%d", EBUSY);
1179                 return (EBUSY);
1180         }
1181
1182         if (gpp->gpp_force) {
1183                 /* Destroy all providers. */
1184                 LIST_FOREACH_SAFE(entry, &table->gpt_entry, gpe_entry, tmp) {
1185                         pp = entry->gpe_pp;
1186                         if (pp != NULL) {
1187                                 pp->private = NULL;
1188                                 g_wither_provider(pp, ENXIO);
1189                         }
1190                         LIST_REMOVE(entry, gpe_entry);
1191                         g_free(entry);
1192                 }
1193         }
1194
1195         error = G_PART_DESTROY(table, gpp);
1196         if (error) {
1197                 gctl_error(req, "%d", error);
1198                 return (error);
1199         }
1200
1201         gp->softc = kobj_create((kobj_class_t)&g_part_null_scheme, M_GEOM,
1202             M_WAITOK);
1203         null = gp->softc;
1204         null->gpt_gp = gp;
1205         null->gpt_scheme = &g_part_null_scheme;
1206         LIST_INIT(&null->gpt_entry);
1207
1208         cp = LIST_FIRST(&gp->consumer);
1209         pp = cp->provider;
1210         null->gpt_last = pp->mediasize / pp->sectorsize - 1;
1211
1212         null->gpt_depth = table->gpt_depth;
1213         null->gpt_opened = table->gpt_opened;
1214         null->gpt_smhead = table->gpt_smhead;
1215         null->gpt_smtail = table->gpt_smtail;
1216
1217         while ((entry = LIST_FIRST(&table->gpt_entry)) != NULL) {
1218                 LIST_REMOVE(entry, gpe_entry);
1219                 g_free(entry);
1220         }
1221         kobj_delete((kobj_t)table, M_GEOM);
1222
1223         /* Provide feedback if so requested. */
1224         if (gpp->gpp_parms & G_PART_PARM_OUTPUT) {
1225                 sb = sbuf_new_auto();
1226                 sbuf_printf(sb, "%s destroyed\n", gp->name);
1227                 sbuf_finish(sb);
1228                 gctl_set_param(req, "output", sbuf_data(sb), sbuf_len(sb) + 1);
1229                 sbuf_delete(sb);
1230         }
1231         return (0);
1232 }
1233
1234 static int
1235 g_part_ctl_modify(struct gctl_req *req, struct g_part_parms *gpp)
1236 {
1237         struct g_geom *gp;
1238         struct g_part_entry *entry;
1239         struct g_part_table *table;
1240         struct sbuf *sb;
1241         int error;
1242
1243         gp = gpp->gpp_geom;
1244         G_PART_TRACE((G_T_TOPOLOGY, "%s(%s)", __func__, gp->name));
1245         g_topology_assert();
1246
1247         table = gp->softc;
1248
1249         LIST_FOREACH(entry, &table->gpt_entry, gpe_entry) {
1250                 if (entry->gpe_deleted || entry->gpe_internal)
1251                         continue;
1252                 if (entry->gpe_index == gpp->gpp_index)
1253                         break;
1254         }
1255         if (entry == NULL) {
1256                 gctl_error(req, "%d index '%d'", ENOENT, gpp->gpp_index);
1257                 return (ENOENT);
1258         }
1259
1260         error = G_PART_MODIFY(table, entry, gpp);
1261         if (error) {
1262                 gctl_error(req, "%d", error);
1263                 return (error);
1264         }
1265
1266         if (!entry->gpe_created)
1267                 entry->gpe_modified = 1;
1268
1269         /* Provide feedback if so requested. */
1270         if (gpp->gpp_parms & G_PART_PARM_OUTPUT) {
1271                 sb = sbuf_new_auto();
1272                 G_PART_FULLNAME(table, entry, sb, gp->name);
1273                 sbuf_cat(sb, " modified\n");
1274                 sbuf_finish(sb);
1275                 gctl_set_param(req, "output", sbuf_data(sb), sbuf_len(sb) + 1);
1276                 sbuf_delete(sb);
1277         }
1278         return (0);
1279 }
1280
1281 static int
1282 g_part_ctl_move(struct gctl_req *req, struct g_part_parms *gpp)
1283 {
1284         gctl_error(req, "%d verb 'move'", ENOSYS);
1285         return (ENOSYS);
1286 }
1287
1288 static int
1289 g_part_ctl_recover(struct gctl_req *req, struct g_part_parms *gpp)
1290 {
1291         struct g_part_table *table;
1292         struct g_geom *gp;
1293         struct sbuf *sb;
1294         int error, recovered;
1295
1296         gp = gpp->gpp_geom;
1297         G_PART_TRACE((G_T_TOPOLOGY, "%s(%s)", __func__, gp->name));
1298         g_topology_assert();
1299         table = gp->softc;
1300         error = recovered = 0;
1301
1302         if (table->gpt_corrupt) {
1303                 error = G_PART_RECOVER(table);
1304                 if (error == 0)
1305                         error = g_part_check_integrity(table,
1306                             LIST_FIRST(&gp->consumer));
1307                 if (error) {
1308                         gctl_error(req, "%d recovering '%s' failed",
1309                             error, gp->name);
1310                         return (error);
1311                 }
1312                 recovered = 1;
1313         }
1314         /* Provide feedback if so requested. */
1315         if (gpp->gpp_parms & G_PART_PARM_OUTPUT) {
1316                 sb = sbuf_new_auto();
1317                 if (recovered)
1318                         sbuf_printf(sb, "%s recovered\n", gp->name);
1319                 else
1320                         sbuf_printf(sb, "%s recovering is not needed\n",
1321                             gp->name);
1322                 sbuf_finish(sb);
1323                 gctl_set_param(req, "output", sbuf_data(sb), sbuf_len(sb) + 1);
1324                 sbuf_delete(sb);
1325         }
1326         return (0);
1327 }
1328
1329 static int
1330 g_part_ctl_resize(struct gctl_req *req, struct g_part_parms *gpp)
1331 {
1332         struct g_geom *gp;
1333         struct g_provider *pp;
1334         struct g_part_entry *pe, *entry;
1335         struct g_part_table *table;
1336         struct sbuf *sb;
1337         quad_t end;
1338         int error;
1339         off_t mediasize;
1340
1341         gp = gpp->gpp_geom;
1342         G_PART_TRACE((G_T_TOPOLOGY, "%s(%s)", __func__, gp->name));
1343         g_topology_assert();
1344         table = gp->softc;
1345
1346         /* check gpp_index */
1347         LIST_FOREACH(entry, &table->gpt_entry, gpe_entry) {
1348                 if (entry->gpe_deleted || entry->gpe_internal)
1349                         continue;
1350                 if (entry->gpe_index == gpp->gpp_index)
1351                         break;
1352         }
1353         if (entry == NULL) {
1354                 gctl_error(req, "%d index '%d'", ENOENT, gpp->gpp_index);
1355                 return (ENOENT);
1356         }
1357
1358         /* check gpp_size */
1359         end = entry->gpe_start + gpp->gpp_size - 1;
1360         if (gpp->gpp_size < 1 || end > table->gpt_last) {
1361                 gctl_error(req, "%d size '%jd'", EINVAL,
1362                     (intmax_t)gpp->gpp_size);
1363                 return (EINVAL);
1364         }
1365
1366         LIST_FOREACH(pe, &table->gpt_entry, gpe_entry) {
1367                 if (pe->gpe_deleted || pe->gpe_internal || pe == entry)
1368                         continue;
1369                 if (end >= pe->gpe_start && end <= pe->gpe_end) {
1370                         gctl_error(req, "%d end '%jd'", ENOSPC,
1371                             (intmax_t)end);
1372                         return (ENOSPC);
1373                 }
1374                 if (entry->gpe_start < pe->gpe_start && end > pe->gpe_end) {
1375                         gctl_error(req, "%d size '%jd'", ENOSPC,
1376                             (intmax_t)gpp->gpp_size);
1377                         return (ENOSPC);
1378                 }
1379         }
1380
1381         pp = entry->gpe_pp;
1382         if ((g_debugflags & 16) == 0 &&
1383             (pp->acr > 0 || pp->acw > 0 || pp->ace > 0)) {
1384                 if (entry->gpe_end - entry->gpe_start + 1 > gpp->gpp_size) {
1385                         /* Deny shrinking of an opened partition. */
1386                         gctl_error(req, "%d", EBUSY);
1387                         return (EBUSY);
1388                 }
1389         }
1390
1391         error = G_PART_RESIZE(table, entry, gpp);
1392         if (error) {
1393                 gctl_error(req, "%d%s", error, error != EBUSY ? "":
1394                     " resizing will lead to unexpected shrinking"
1395                     " due to alignment");
1396                 return (error);
1397         }
1398
1399         if (!entry->gpe_created)
1400                 entry->gpe_modified = 1;
1401
1402         /* update mediasize of changed provider */
1403         mediasize = (entry->gpe_end - entry->gpe_start + 1) *
1404                 pp->sectorsize;
1405         g_resize_provider(pp, mediasize);
1406
1407         /* Provide feedback if so requested. */
1408         if (gpp->gpp_parms & G_PART_PARM_OUTPUT) {
1409                 sb = sbuf_new_auto();
1410                 G_PART_FULLNAME(table, entry, sb, gp->name);
1411                 sbuf_cat(sb, " resized\n");
1412                 sbuf_finish(sb);
1413                 gctl_set_param(req, "output", sbuf_data(sb), sbuf_len(sb) + 1);
1414                 sbuf_delete(sb);
1415         }
1416         return (0);
1417 }
1418
1419 static int
1420 g_part_ctl_setunset(struct gctl_req *req, struct g_part_parms *gpp,
1421     unsigned int set)
1422 {
1423         struct g_geom *gp;
1424         struct g_part_entry *entry;
1425         struct g_part_table *table;
1426         struct sbuf *sb;
1427         int error;
1428
1429         gp = gpp->gpp_geom;
1430         G_PART_TRACE((G_T_TOPOLOGY, "%s(%s)", __func__, gp->name));
1431         g_topology_assert();
1432
1433         table = gp->softc;
1434
1435         if (gpp->gpp_parms & G_PART_PARM_INDEX) {
1436                 LIST_FOREACH(entry, &table->gpt_entry, gpe_entry) {
1437                         if (entry->gpe_deleted || entry->gpe_internal)
1438                                 continue;
1439                         if (entry->gpe_index == gpp->gpp_index)
1440                                 break;
1441                 }
1442                 if (entry == NULL) {
1443                         gctl_error(req, "%d index '%d'", ENOENT,
1444                             gpp->gpp_index);
1445                         return (ENOENT);
1446                 }
1447         } else
1448                 entry = NULL;
1449
1450         error = G_PART_SETUNSET(table, entry, gpp->gpp_attrib, set);
1451         if (error) {
1452                 gctl_error(req, "%d attrib '%s'", error, gpp->gpp_attrib);
1453                 return (error);
1454         }
1455
1456         /* Provide feedback if so requested. */
1457         if (gpp->gpp_parms & G_PART_PARM_OUTPUT) {
1458                 sb = sbuf_new_auto();
1459                 sbuf_printf(sb, "%s %sset on ", gpp->gpp_attrib,
1460                     (set) ? "" : "un");
1461                 if (entry)
1462                         G_PART_FULLNAME(table, entry, sb, gp->name);
1463                 else
1464                         sbuf_cat(sb, gp->name);
1465                 sbuf_cat(sb, "\n");
1466                 sbuf_finish(sb);
1467                 gctl_set_param(req, "output", sbuf_data(sb), sbuf_len(sb) + 1);
1468                 sbuf_delete(sb);
1469         }
1470         return (0);
1471 }
1472
1473 static int
1474 g_part_ctl_undo(struct gctl_req *req, struct g_part_parms *gpp)
1475 {
1476         struct g_consumer *cp;
1477         struct g_provider *pp;
1478         struct g_geom *gp;
1479         struct g_part_entry *entry, *tmp;
1480         struct g_part_table *table;
1481         int error, reprobe;
1482
1483         gp = gpp->gpp_geom;
1484         G_PART_TRACE((G_T_TOPOLOGY, "%s(%s)", __func__, gp->name));
1485         g_topology_assert();
1486
1487         table = gp->softc;
1488         if (!table->gpt_opened) {
1489                 gctl_error(req, "%d", EPERM);
1490                 return (EPERM);
1491         }
1492
1493         cp = LIST_FIRST(&gp->consumer);
1494         LIST_FOREACH_SAFE(entry, &table->gpt_entry, gpe_entry, tmp) {
1495                 entry->gpe_modified = 0;
1496                 if (entry->gpe_created) {
1497                         pp = entry->gpe_pp;
1498                         if (pp != NULL) {
1499                                 pp->private = NULL;
1500                                 entry->gpe_pp = NULL;
1501                                 g_wither_provider(pp, ENXIO);
1502                         }
1503                         entry->gpe_deleted = 1;
1504                 }
1505                 if (entry->gpe_deleted) {
1506                         LIST_REMOVE(entry, gpe_entry);
1507                         g_free(entry);
1508                 }
1509         }
1510
1511         g_topology_unlock();
1512
1513         reprobe = (table->gpt_scheme == &g_part_null_scheme ||
1514             table->gpt_created) ? 1 : 0;
1515
1516         if (reprobe) {
1517                 LIST_FOREACH(entry, &table->gpt_entry, gpe_entry) {
1518                         if (entry->gpe_internal)
1519                                 continue;
1520                         error = EBUSY;
1521                         goto fail;
1522                 }
1523                 while ((entry = LIST_FIRST(&table->gpt_entry)) != NULL) {
1524                         LIST_REMOVE(entry, gpe_entry);
1525                         g_free(entry);
1526                 }
1527                 error = g_part_probe(gp, cp, table->gpt_depth);
1528                 if (error) {
1529                         g_topology_lock();
1530                         g_access(cp, -1, -1, -1);
1531                         g_part_wither(gp, error);
1532                         return (0);
1533                 }
1534                 table = gp->softc;
1535
1536                 /*
1537                  * Synthesize a disk geometry. Some partitioning schemes
1538                  * depend on it and since some file systems need it even
1539                  * when the partitition scheme doesn't, we do it here in
1540                  * scheme-independent code.
1541                  */
1542                 pp = cp->provider;
1543                 g_part_geometry(table, cp, pp->mediasize / pp->sectorsize);
1544         }
1545
1546         error = G_PART_READ(table, cp);
1547         if (error)
1548                 goto fail;
1549         error = g_part_check_integrity(table, cp);
1550         if (error)
1551                 goto fail;
1552
1553         g_topology_lock();
1554         LIST_FOREACH(entry, &table->gpt_entry, gpe_entry) {
1555                 if (!entry->gpe_internal)
1556                         g_part_new_provider(gp, table, entry);
1557         }
1558
1559         table->gpt_opened = 0;
1560         g_access(cp, -1, -1, -1);
1561         return (0);
1562
1563 fail:
1564         g_topology_lock();
1565         gctl_error(req, "%d", error);
1566         return (error);
1567 }
1568
1569 static void
1570 g_part_wither(struct g_geom *gp, int error)
1571 {
1572         struct g_part_entry *entry;
1573         struct g_part_table *table;
1574         struct g_provider *pp;
1575
1576         table = gp->softc;
1577         if (table != NULL) {
1578                 gp->softc = NULL;
1579                 while ((entry = LIST_FIRST(&table->gpt_entry)) != NULL) {
1580                         LIST_REMOVE(entry, gpe_entry);
1581                         pp = entry->gpe_pp;
1582                         entry->gpe_pp = NULL;
1583                         if (pp != NULL) {
1584                                 pp->private = NULL;
1585                                 g_wither_provider(pp, error);
1586                         }
1587                         g_free(entry);
1588                 }
1589                 G_PART_DESTROY(table, NULL);
1590                 kobj_delete((kobj_t)table, M_GEOM);
1591         }
1592         g_wither_geom(gp, error);
1593 }
1594
1595 /*
1596  * Class methods.
1597  */
1598
1599 static void
1600 g_part_ctlreq(struct gctl_req *req, struct g_class *mp, const char *verb)
1601 {
1602         struct g_part_parms gpp;
1603         struct g_part_table *table;
1604         struct gctl_req_arg *ap;
1605         enum g_part_ctl ctlreq;
1606         unsigned int i, mparms, oparms, parm;
1607         int auto_commit, close_on_error;
1608         int error, modifies;
1609
1610         G_PART_TRACE((G_T_TOPOLOGY, "%s(%s,%s)", __func__, mp->name, verb));
1611         g_topology_assert();
1612
1613         ctlreq = G_PART_CTL_NONE;
1614         modifies = 1;
1615         mparms = 0;
1616         oparms = G_PART_PARM_FLAGS | G_PART_PARM_OUTPUT | G_PART_PARM_VERSION;
1617         switch (*verb) {
1618         case 'a':
1619                 if (!strcmp(verb, "add")) {
1620                         ctlreq = G_PART_CTL_ADD;
1621                         mparms |= G_PART_PARM_GEOM | G_PART_PARM_SIZE |
1622                             G_PART_PARM_START | G_PART_PARM_TYPE;
1623                         oparms |= G_PART_PARM_INDEX | G_PART_PARM_LABEL;
1624                 }
1625                 break;
1626         case 'b':
1627                 if (!strcmp(verb, "bootcode")) {
1628                         ctlreq = G_PART_CTL_BOOTCODE;
1629                         mparms |= G_PART_PARM_GEOM | G_PART_PARM_BOOTCODE;
1630                 }
1631                 break;
1632         case 'c':
1633                 if (!strcmp(verb, "commit")) {
1634                         ctlreq = G_PART_CTL_COMMIT;
1635                         mparms |= G_PART_PARM_GEOM;
1636                         modifies = 0;
1637                 } else if (!strcmp(verb, "create")) {
1638                         ctlreq = G_PART_CTL_CREATE;
1639                         mparms |= G_PART_PARM_PROVIDER | G_PART_PARM_SCHEME;
1640                         oparms |= G_PART_PARM_ENTRIES;
1641                 }
1642                 break;
1643         case 'd':
1644                 if (!strcmp(verb, "delete")) {
1645                         ctlreq = G_PART_CTL_DELETE;
1646                         mparms |= G_PART_PARM_GEOM | G_PART_PARM_INDEX;
1647                 } else if (!strcmp(verb, "destroy")) {
1648                         ctlreq = G_PART_CTL_DESTROY;
1649                         mparms |= G_PART_PARM_GEOM;
1650                         oparms |= G_PART_PARM_FORCE;
1651                 }
1652                 break;
1653         case 'm':
1654                 if (!strcmp(verb, "modify")) {
1655                         ctlreq = G_PART_CTL_MODIFY;
1656                         mparms |= G_PART_PARM_GEOM | G_PART_PARM_INDEX;
1657                         oparms |= G_PART_PARM_LABEL | G_PART_PARM_TYPE;
1658                 } else if (!strcmp(verb, "move")) {
1659                         ctlreq = G_PART_CTL_MOVE;
1660                         mparms |= G_PART_PARM_GEOM | G_PART_PARM_INDEX;
1661                 }
1662                 break;
1663         case 'r':
1664                 if (!strcmp(verb, "recover")) {
1665                         ctlreq = G_PART_CTL_RECOVER;
1666                         mparms |= G_PART_PARM_GEOM;
1667                 } else if (!strcmp(verb, "resize")) {
1668                         ctlreq = G_PART_CTL_RESIZE;
1669                         mparms |= G_PART_PARM_GEOM | G_PART_PARM_INDEX |
1670                             G_PART_PARM_SIZE;
1671                 }
1672                 break;
1673         case 's':
1674                 if (!strcmp(verb, "set")) {
1675                         ctlreq = G_PART_CTL_SET;
1676                         mparms |= G_PART_PARM_ATTRIB | G_PART_PARM_GEOM;
1677                         oparms |= G_PART_PARM_INDEX;
1678                 }
1679                 break;
1680         case 'u':
1681                 if (!strcmp(verb, "undo")) {
1682                         ctlreq = G_PART_CTL_UNDO;
1683                         mparms |= G_PART_PARM_GEOM;
1684                         modifies = 0;
1685                 } else if (!strcmp(verb, "unset")) {
1686                         ctlreq = G_PART_CTL_UNSET;
1687                         mparms |= G_PART_PARM_ATTRIB | G_PART_PARM_GEOM;
1688                         oparms |= G_PART_PARM_INDEX;
1689                 }
1690                 break;
1691         }
1692         if (ctlreq == G_PART_CTL_NONE) {
1693                 gctl_error(req, "%d verb '%s'", EINVAL, verb);
1694                 return;
1695         }
1696
1697         bzero(&gpp, sizeof(gpp));
1698         for (i = 0; i < req->narg; i++) {
1699                 ap = &req->arg[i];
1700                 parm = 0;
1701                 switch (ap->name[0]) {
1702                 case 'a':
1703                         if (!strcmp(ap->name, "arg0")) {
1704                                 parm = mparms &
1705                                     (G_PART_PARM_GEOM | G_PART_PARM_PROVIDER);
1706                         }
1707                         if (!strcmp(ap->name, "attrib"))
1708                                 parm = G_PART_PARM_ATTRIB;
1709                         break;
1710                 case 'b':
1711                         if (!strcmp(ap->name, "bootcode"))
1712                                 parm = G_PART_PARM_BOOTCODE;
1713                         break;
1714                 case 'c':
1715                         if (!strcmp(ap->name, "class"))
1716                                 continue;
1717                         break;
1718                 case 'e':
1719                         if (!strcmp(ap->name, "entries"))
1720                                 parm = G_PART_PARM_ENTRIES;
1721                         break;
1722                 case 'f':
1723                         if (!strcmp(ap->name, "flags"))
1724                                 parm = G_PART_PARM_FLAGS;
1725                         else if (!strcmp(ap->name, "force"))
1726                                 parm = G_PART_PARM_FORCE;
1727                         break;
1728                 case 'i':
1729                         if (!strcmp(ap->name, "index"))
1730                                 parm = G_PART_PARM_INDEX;
1731                         break;
1732                 case 'l':
1733                         if (!strcmp(ap->name, "label"))
1734                                 parm = G_PART_PARM_LABEL;
1735                         break;
1736                 case 'o':
1737                         if (!strcmp(ap->name, "output"))
1738                                 parm = G_PART_PARM_OUTPUT;
1739                         break;
1740                 case 's':
1741                         if (!strcmp(ap->name, "scheme"))
1742                                 parm = G_PART_PARM_SCHEME;
1743                         else if (!strcmp(ap->name, "size"))
1744                                 parm = G_PART_PARM_SIZE;
1745                         else if (!strcmp(ap->name, "start"))
1746                                 parm = G_PART_PARM_START;
1747                         break;
1748                 case 't':
1749                         if (!strcmp(ap->name, "type"))
1750                                 parm = G_PART_PARM_TYPE;
1751                         break;
1752                 case 'v':
1753                         if (!strcmp(ap->name, "verb"))
1754                                 continue;
1755                         else if (!strcmp(ap->name, "version"))
1756                                 parm = G_PART_PARM_VERSION;
1757                         break;
1758                 }
1759                 if ((parm & (mparms | oparms)) == 0) {
1760                         gctl_error(req, "%d param '%s'", EINVAL, ap->name);
1761                         return;
1762                 }
1763                 switch (parm) {
1764                 case G_PART_PARM_ATTRIB:
1765                         error = g_part_parm_str(req, ap->name,
1766                             &gpp.gpp_attrib);
1767                         break;
1768                 case G_PART_PARM_BOOTCODE:
1769                         error = g_part_parm_bootcode(req, ap->name,
1770                             &gpp.gpp_codeptr, &gpp.gpp_codesize);
1771                         break;
1772                 case G_PART_PARM_ENTRIES:
1773                         error = g_part_parm_intmax(req, ap->name,
1774                             &gpp.gpp_entries);
1775                         break;
1776                 case G_PART_PARM_FLAGS:
1777                         error = g_part_parm_str(req, ap->name, &gpp.gpp_flags);
1778                         break;
1779                 case G_PART_PARM_FORCE:
1780                         error = g_part_parm_uint32(req, ap->name,
1781                             &gpp.gpp_force);
1782                         break;
1783                 case G_PART_PARM_GEOM:
1784                         error = g_part_parm_geom(req, ap->name, &gpp.gpp_geom);
1785                         break;
1786                 case G_PART_PARM_INDEX:
1787                         error = g_part_parm_intmax(req, ap->name,
1788                             &gpp.gpp_index);
1789                         break;
1790                 case G_PART_PARM_LABEL:
1791                         error = g_part_parm_str(req, ap->name, &gpp.gpp_label);
1792                         break;
1793                 case G_PART_PARM_OUTPUT:
1794                         error = 0;      /* Write-only parameter */
1795                         break;
1796                 case G_PART_PARM_PROVIDER:
1797                         error = g_part_parm_provider(req, ap->name,
1798                             &gpp.gpp_provider);
1799                         break;
1800                 case G_PART_PARM_SCHEME:
1801                         error = g_part_parm_scheme(req, ap->name,
1802                             &gpp.gpp_scheme);
1803                         break;
1804                 case G_PART_PARM_SIZE:
1805                         error = g_part_parm_quad(req, ap->name, &gpp.gpp_size);
1806                         break;
1807                 case G_PART_PARM_START:
1808                         error = g_part_parm_quad(req, ap->name,
1809                             &gpp.gpp_start);
1810                         break;
1811                 case G_PART_PARM_TYPE:
1812                         error = g_part_parm_str(req, ap->name, &gpp.gpp_type);
1813                         break;
1814                 case G_PART_PARM_VERSION:
1815                         error = g_part_parm_uint32(req, ap->name,
1816                             &gpp.gpp_version);
1817                         break;
1818                 default:
1819                         error = EDOOFUS;
1820                         gctl_error(req, "%d %s", error, ap->name);
1821                         break;
1822                 }
1823                 if (error != 0) {
1824                         if (error == ENOATTR) {
1825                                 gctl_error(req, "%d param '%s'", error,
1826                                     ap->name);
1827                         }
1828                         return;
1829                 }
1830                 gpp.gpp_parms |= parm;
1831         }
1832         if ((gpp.gpp_parms & mparms) != mparms) {
1833                 parm = mparms - (gpp.gpp_parms & mparms);
1834                 gctl_error(req, "%d param '%x'", ENOATTR, parm);
1835                 return;
1836         }
1837
1838         /* Obtain permissions if possible/necessary. */
1839         close_on_error = 0;
1840         table = NULL;
1841         if (modifies && (gpp.gpp_parms & G_PART_PARM_GEOM)) {
1842                 table = gpp.gpp_geom->softc;
1843                 if (table != NULL && table->gpt_corrupt &&
1844                     ctlreq != G_PART_CTL_DESTROY &&
1845                     ctlreq != G_PART_CTL_RECOVER) {
1846                         gctl_error(req, "%d table '%s' is corrupt",
1847                             EPERM, gpp.gpp_geom->name);
1848                         return;
1849                 }
1850                 if (table != NULL && !table->gpt_opened) {
1851                         error = g_access(LIST_FIRST(&gpp.gpp_geom->consumer),
1852                             1, 1, 1);
1853                         if (error) {
1854                                 gctl_error(req, "%d geom '%s'", error,
1855                                     gpp.gpp_geom->name);
1856                                 return;
1857                         }
1858                         table->gpt_opened = 1;
1859                         close_on_error = 1;
1860                 }
1861         }
1862
1863         /* Allow the scheme to check or modify the parameters. */
1864         if (table != NULL) {
1865                 error = G_PART_PRECHECK(table, ctlreq, &gpp);
1866                 if (error) {
1867                         gctl_error(req, "%d pre-check failed", error);
1868                         goto out;
1869                 }
1870         } else
1871                 error = EDOOFUS;        /* Prevent bogus uninit. warning. */
1872
1873         switch (ctlreq) {
1874         case G_PART_CTL_NONE:
1875                 panic("%s", __func__);
1876         case G_PART_CTL_ADD:
1877                 error = g_part_ctl_add(req, &gpp);
1878                 break;
1879         case G_PART_CTL_BOOTCODE:
1880                 error = g_part_ctl_bootcode(req, &gpp);
1881                 break;
1882         case G_PART_CTL_COMMIT:
1883                 error = g_part_ctl_commit(req, &gpp);
1884                 break;
1885         case G_PART_CTL_CREATE:
1886                 error = g_part_ctl_create(req, &gpp);
1887                 break;
1888         case G_PART_CTL_DELETE:
1889                 error = g_part_ctl_delete(req, &gpp);
1890                 break;
1891         case G_PART_CTL_DESTROY:
1892                 error = g_part_ctl_destroy(req, &gpp);
1893                 break;
1894         case G_PART_CTL_MODIFY:
1895                 error = g_part_ctl_modify(req, &gpp);
1896                 break;
1897         case G_PART_CTL_MOVE:
1898                 error = g_part_ctl_move(req, &gpp);
1899                 break;
1900         case G_PART_CTL_RECOVER:
1901                 error = g_part_ctl_recover(req, &gpp);
1902                 break;
1903         case G_PART_CTL_RESIZE:
1904                 error = g_part_ctl_resize(req, &gpp);
1905                 break;
1906         case G_PART_CTL_SET:
1907                 error = g_part_ctl_setunset(req, &gpp, 1);
1908                 break;
1909         case G_PART_CTL_UNDO:
1910                 error = g_part_ctl_undo(req, &gpp);
1911                 break;
1912         case G_PART_CTL_UNSET:
1913                 error = g_part_ctl_setunset(req, &gpp, 0);
1914                 break;
1915         }
1916
1917         /* Implement automatic commit. */
1918         if (!error) {
1919                 auto_commit = (modifies &&
1920                     (gpp.gpp_parms & G_PART_PARM_FLAGS) &&
1921                     strchr(gpp.gpp_flags, 'C') != NULL) ? 1 : 0;
1922                 if (auto_commit) {
1923                         KASSERT(gpp.gpp_parms & G_PART_PARM_GEOM, ("%s",
1924                             __func__));
1925                         error = g_part_ctl_commit(req, &gpp);
1926                 }
1927         }
1928
1929  out:
1930         if (error && close_on_error) {
1931                 g_access(LIST_FIRST(&gpp.gpp_geom->consumer), -1, -1, -1);
1932                 table->gpt_opened = 0;
1933         }
1934 }
1935
1936 static int
1937 g_part_destroy_geom(struct gctl_req *req, struct g_class *mp,
1938     struct g_geom *gp)
1939 {
1940
1941         G_PART_TRACE((G_T_TOPOLOGY, "%s(%s,%s)", __func__, mp->name, gp->name));
1942         g_topology_assert();
1943
1944         g_part_wither(gp, EINVAL);
1945         return (0);
1946 }
1947
1948 static struct g_geom *
1949 g_part_taste(struct g_class *mp, struct g_provider *pp, int flags __unused)
1950 {
1951         struct g_consumer *cp;
1952         struct g_geom *gp;
1953         struct g_part_entry *entry;
1954         struct g_part_table *table;
1955         struct root_hold_token *rht;
1956         struct g_geom_alias *gap;
1957         int attr, depth;
1958         int error;
1959
1960         G_PART_TRACE((G_T_TOPOLOGY, "%s(%s,%s)", __func__, mp->name, pp->name));
1961         g_topology_assert();
1962
1963         /* Skip providers that are already open for writing. */
1964         if (pp->acw > 0)
1965                 return (NULL);
1966
1967         /*
1968          * Create a GEOM with consumer and hook it up to the provider.
1969          * With that we become part of the topology. Obtain read access
1970          * to the provider.
1971          */
1972         gp = g_new_geomf(mp, "%s", pp->name);
1973         LIST_FOREACH(gap, &pp->geom->aliases, ga_next)
1974                 g_geom_add_alias(gp, gap->ga_alias);
1975         cp = g_new_consumer(gp);
1976         cp->flags |= G_CF_DIRECT_SEND | G_CF_DIRECT_RECEIVE;
1977         error = g_attach(cp, pp);
1978         if (error == 0)
1979                 error = g_access(cp, 1, 0, 0);
1980         if (error != 0) {
1981                 if (cp->provider)
1982                         g_detach(cp);
1983                 g_destroy_consumer(cp);
1984                 g_destroy_geom(gp);
1985                 return (NULL);
1986         }
1987
1988         rht = root_mount_hold(mp->name);
1989         g_topology_unlock();
1990
1991         /*
1992          * Short-circuit the whole probing galore when there's no
1993          * media present.
1994          */
1995         if (pp->mediasize == 0 || pp->sectorsize == 0) {
1996                 error = ENODEV;
1997                 goto fail;
1998         }
1999
2000         /* Make sure we can nest and if so, determine our depth. */
2001         error = g_getattr("PART::isleaf", cp, &attr);
2002         if (!error && attr) {
2003                 error = ENODEV;
2004                 goto fail;
2005         }
2006         error = g_getattr("PART::depth", cp, &attr);
2007         depth = (!error) ? attr + 1 : 0;
2008
2009         error = g_part_probe(gp, cp, depth);
2010         if (error)
2011                 goto fail;
2012
2013         table = gp->softc;
2014
2015         /*
2016          * Synthesize a disk geometry. Some partitioning schemes
2017          * depend on it and since some file systems need it even
2018          * when the partitition scheme doesn't, we do it here in
2019          * scheme-independent code.
2020          */
2021         g_part_geometry(table, cp, pp->mediasize / pp->sectorsize);
2022
2023         error = G_PART_READ(table, cp);
2024         if (error)
2025                 goto fail;
2026         error = g_part_check_integrity(table, cp);
2027         if (error)
2028                 goto fail;
2029
2030         g_topology_lock();
2031         LIST_FOREACH(entry, &table->gpt_entry, gpe_entry) {
2032                 if (!entry->gpe_internal)
2033                         g_part_new_provider(gp, table, entry);
2034         }
2035
2036         root_mount_rel(rht);
2037         g_access(cp, -1, 0, 0);
2038         return (gp);
2039
2040  fail:
2041         g_topology_lock();
2042         root_mount_rel(rht);
2043         g_access(cp, -1, 0, 0);
2044         g_detach(cp);
2045         g_destroy_consumer(cp);
2046         g_destroy_geom(gp);
2047         return (NULL);
2048 }
2049
2050 /*
2051  * Geom methods.
2052  */
2053
2054 static int
2055 g_part_access(struct g_provider *pp, int dr, int dw, int de)
2056 {
2057         struct g_consumer *cp;
2058
2059         G_PART_TRACE((G_T_ACCESS, "%s(%s,%d,%d,%d)", __func__, pp->name, dr,
2060             dw, de));
2061
2062         cp = LIST_FIRST(&pp->geom->consumer);
2063
2064         /* We always gain write-exclusive access. */
2065         return (g_access(cp, dr, dw, dw + de));
2066 }
2067
2068 static void
2069 g_part_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp,
2070     struct g_consumer *cp, struct g_provider *pp)
2071 {
2072         char buf[64];
2073         struct g_part_entry *entry;
2074         struct g_part_table *table;
2075
2076         KASSERT(sb != NULL && gp != NULL, ("%s", __func__));
2077         table = gp->softc;
2078
2079         if (indent == NULL) {
2080                 KASSERT(cp == NULL && pp != NULL, ("%s", __func__));
2081                 entry = pp->private;
2082                 if (entry == NULL)
2083                         return;
2084                 sbuf_printf(sb, " i %u o %ju ty %s", entry->gpe_index,
2085                     (uintmax_t)entry->gpe_offset,
2086                     G_PART_TYPE(table, entry, buf, sizeof(buf)));
2087                 /*
2088                  * libdisk compatibility quirk - the scheme dumps the
2089                  * slicer name and partition type in a way that is
2090                  * compatible with libdisk. When libdisk is not used
2091                  * anymore, this should go away.
2092                  */
2093                 G_PART_DUMPCONF(table, entry, sb, indent);
2094         } else if (cp != NULL) {        /* Consumer configuration. */
2095                 KASSERT(pp == NULL, ("%s", __func__));
2096                 /* none */
2097         } else if (pp != NULL) {        /* Provider configuration. */
2098                 entry = pp->private;
2099                 if (entry == NULL)
2100                         return;
2101                 sbuf_printf(sb, "%s<start>%ju</start>\n", indent,
2102                     (uintmax_t)entry->gpe_start);
2103                 sbuf_printf(sb, "%s<end>%ju</end>\n", indent,
2104                     (uintmax_t)entry->gpe_end);
2105                 sbuf_printf(sb, "%s<index>%u</index>\n", indent,
2106                     entry->gpe_index);
2107                 sbuf_printf(sb, "%s<type>%s</type>\n", indent,
2108                     G_PART_TYPE(table, entry, buf, sizeof(buf)));
2109                 sbuf_printf(sb, "%s<offset>%ju</offset>\n", indent,
2110                     (uintmax_t)entry->gpe_offset);
2111                 sbuf_printf(sb, "%s<length>%ju</length>\n", indent,
2112                     (uintmax_t)pp->mediasize);
2113                 G_PART_DUMPCONF(table, entry, sb, indent);
2114         } else {                        /* Geom configuration. */
2115                 sbuf_printf(sb, "%s<scheme>%s</scheme>\n", indent,
2116                     table->gpt_scheme->name);
2117                 sbuf_printf(sb, "%s<entries>%u</entries>\n", indent,
2118                     table->gpt_entries);
2119                 sbuf_printf(sb, "%s<first>%ju</first>\n", indent,
2120                     (uintmax_t)table->gpt_first);
2121                 sbuf_printf(sb, "%s<last>%ju</last>\n", indent,
2122                     (uintmax_t)table->gpt_last);
2123                 sbuf_printf(sb, "%s<fwsectors>%u</fwsectors>\n", indent,
2124                     table->gpt_sectors);
2125                 sbuf_printf(sb, "%s<fwheads>%u</fwheads>\n", indent,
2126                     table->gpt_heads);
2127                 sbuf_printf(sb, "%s<state>%s</state>\n", indent,
2128                     table->gpt_corrupt ? "CORRUPT": "OK");
2129                 sbuf_printf(sb, "%s<modified>%s</modified>\n", indent,
2130                     table->gpt_opened ? "true": "false");
2131                 G_PART_DUMPCONF(table, NULL, sb, indent);
2132         }
2133 }
2134
2135 /*-
2136  * This start routine is only called for non-trivial requests, all the
2137  * trivial ones are handled autonomously by the slice code.
2138  * For requests we handle here, we must call the g_io_deliver() on the
2139  * bio, and return non-zero to indicate to the slice code that we did so.
2140  * This code executes in the "DOWN" I/O path, this means:
2141  *    * No sleeping.
2142  *    * Don't grab the topology lock.
2143  *    * Don't call biowait, g_getattr(), g_setattr() or g_read_data()
2144  */
2145 static int
2146 g_part_ioctl(struct g_provider *pp, u_long cmd, void *data, int fflag, struct thread *td)
2147 {
2148         struct g_part_table *table;
2149
2150         table = pp->geom->softc;
2151         return G_PART_IOCTL(table, pp, cmd, data, fflag, td);
2152 }
2153
2154 static void
2155 g_part_resize(struct g_consumer *cp)
2156 {
2157         struct g_part_table *table;
2158
2159         G_PART_TRACE((G_T_TOPOLOGY, "%s(%s)", __func__, cp->provider->name));
2160         g_topology_assert();
2161
2162         if (auto_resize == 0)
2163                 return;
2164
2165         table = cp->geom->softc;
2166         if (table->gpt_opened == 0) {
2167                 if (g_access(cp, 1, 1, 1) != 0)
2168                         return;
2169                 table->gpt_opened = 1;
2170         }
2171         if (G_PART_RESIZE(table, NULL, NULL) == 0)
2172                 printf("GEOM_PART: %s was automatically resized.\n"
2173                     "  Use `gpart commit %s` to save changes or "
2174                     "`gpart undo %s` to revert them.\n", cp->geom->name,
2175                     cp->geom->name, cp->geom->name);
2176         if (g_part_check_integrity(table, cp) != 0) {
2177                 g_access(cp, -1, -1, -1);
2178                 table->gpt_opened = 0;
2179                 g_part_wither(table->gpt_gp, ENXIO);
2180         }
2181 }
2182
2183 static void
2184 g_part_orphan(struct g_consumer *cp)
2185 {
2186         struct g_provider *pp;
2187         struct g_part_table *table;
2188
2189         pp = cp->provider;
2190         KASSERT(pp != NULL, ("%s", __func__));
2191         G_PART_TRACE((G_T_TOPOLOGY, "%s(%s)", __func__, pp->name));
2192         g_topology_assert();
2193
2194         KASSERT(pp->error != 0, ("%s", __func__));
2195         table = cp->geom->softc;
2196         if (table != NULL && table->gpt_opened)
2197                 g_access(cp, -1, -1, -1);
2198         g_part_wither(cp->geom, pp->error);
2199 }
2200
2201 static void
2202 g_part_spoiled(struct g_consumer *cp)
2203 {
2204
2205         G_PART_TRACE((G_T_TOPOLOGY, "%s(%s)", __func__, cp->provider->name));
2206         g_topology_assert();
2207
2208         cp->flags |= G_CF_ORPHAN;
2209         g_part_wither(cp->geom, ENXIO);
2210 }
2211
2212 static void
2213 g_part_start(struct bio *bp)
2214 {
2215         struct bio *bp2;
2216         struct g_consumer *cp;
2217         struct g_geom *gp;
2218         struct g_part_entry *entry;
2219         struct g_part_table *table;
2220         struct g_kerneldump *gkd;
2221         struct g_provider *pp;
2222         void (*done_func)(struct bio *) = g_std_done;
2223         char buf[64];
2224
2225         biotrack(bp, __func__);
2226
2227         pp = bp->bio_to;
2228         gp = pp->geom;
2229         table = gp->softc;
2230         cp = LIST_FIRST(&gp->consumer);
2231
2232         G_PART_TRACE((G_T_BIO, "%s: cmd=%d, provider=%s", __func__, bp->bio_cmd,
2233             pp->name));
2234
2235         entry = pp->private;
2236         if (entry == NULL) {
2237                 g_io_deliver(bp, ENXIO);
2238                 return;
2239         }
2240
2241         switch(bp->bio_cmd) {
2242         case BIO_DELETE:
2243         case BIO_READ:
2244         case BIO_WRITE:
2245                 if (bp->bio_offset >= pp->mediasize) {
2246                         g_io_deliver(bp, EIO);
2247                         return;
2248                 }
2249                 bp2 = g_clone_bio(bp);
2250                 if (bp2 == NULL) {
2251                         g_io_deliver(bp, ENOMEM);
2252                         return;
2253                 }
2254                 if (bp2->bio_offset + bp2->bio_length > pp->mediasize)
2255                         bp2->bio_length = pp->mediasize - bp2->bio_offset;
2256                 bp2->bio_done = g_std_done;
2257                 bp2->bio_offset += entry->gpe_offset;
2258                 g_io_request(bp2, cp);
2259                 return;
2260         case BIO_FLUSH:
2261                 break;
2262         case BIO_GETATTR:
2263                 if (g_handleattr_int(bp, "GEOM::fwheads", table->gpt_heads))
2264                         return;
2265                 if (g_handleattr_int(bp, "GEOM::fwsectors", table->gpt_sectors))
2266                         return;
2267                 if (g_handleattr_int(bp, "PART::isleaf", table->gpt_isleaf))
2268                         return;
2269                 if (g_handleattr_int(bp, "PART::depth", table->gpt_depth))
2270                         return;
2271                 if (g_handleattr_str(bp, "PART::scheme",
2272                     table->gpt_scheme->name))
2273                         return;
2274                 if (g_handleattr_str(bp, "PART::type",
2275                     G_PART_TYPE(table, entry, buf, sizeof(buf))))
2276                         return;
2277                 if (!strcmp("GEOM::physpath", bp->bio_attribute)) {
2278                         done_func = g_part_get_physpath_done;
2279                         break;
2280                 }
2281                 if (!strcmp("GEOM::kerneldump", bp->bio_attribute)) {
2282                         /*
2283                          * Check that the partition is suitable for kernel
2284                          * dumps. Typically only swap partitions should be
2285                          * used. If the request comes from the nested scheme
2286                          * we allow dumping there as well.
2287                          */
2288                         if ((bp->bio_from == NULL ||
2289                             bp->bio_from->geom->class != &g_part_class) &&
2290                             G_PART_DUMPTO(table, entry) == 0) {
2291                                 g_io_deliver(bp, ENODEV);
2292                                 printf("GEOM_PART: Partition '%s' not suitable"
2293                                     " for kernel dumps (wrong type?)\n",
2294                                     pp->name);
2295                                 return;
2296                         }
2297                         gkd = (struct g_kerneldump *)bp->bio_data;
2298                         if (gkd->offset >= pp->mediasize) {
2299                                 g_io_deliver(bp, EIO);
2300                                 return;
2301                         }
2302                         if (gkd->offset + gkd->length > pp->mediasize)
2303                                 gkd->length = pp->mediasize - gkd->offset;
2304                         gkd->offset += entry->gpe_offset;
2305                 }
2306                 break;
2307         default:
2308                 g_io_deliver(bp, EOPNOTSUPP);
2309                 return;
2310         }
2311
2312         bp2 = g_clone_bio(bp);
2313         if (bp2 == NULL) {
2314                 g_io_deliver(bp, ENOMEM);
2315                 return;
2316         }
2317         bp2->bio_done = done_func;
2318         g_io_request(bp2, cp);
2319 }
2320
2321 static void
2322 g_part_init(struct g_class *mp)
2323 {
2324
2325         TAILQ_INSERT_HEAD(&g_part_schemes, &g_part_null_scheme, scheme_list);
2326 }
2327
2328 static void
2329 g_part_fini(struct g_class *mp)
2330 {
2331
2332         TAILQ_REMOVE(&g_part_schemes, &g_part_null_scheme, scheme_list);
2333 }
2334
2335 static void
2336 g_part_unload_event(void *arg, int flag)
2337 {
2338         struct g_consumer *cp;
2339         struct g_geom *gp;
2340         struct g_provider *pp;
2341         struct g_part_scheme *scheme;
2342         struct g_part_table *table;
2343         uintptr_t *xchg;
2344         int acc, error;
2345
2346         if (flag == EV_CANCEL)
2347                 return;
2348
2349         xchg = arg;
2350         error = 0;
2351         scheme = (void *)(*xchg);
2352
2353         g_topology_assert();
2354
2355         LIST_FOREACH(gp, &g_part_class.geom, geom) {
2356                 table = gp->softc;
2357                 if (table->gpt_scheme != scheme)
2358                         continue;
2359
2360                 acc = 0;
2361                 LIST_FOREACH(pp, &gp->provider, provider)
2362                         acc += pp->acr + pp->acw + pp->ace;
2363                 LIST_FOREACH(cp, &gp->consumer, consumer)
2364                         acc += cp->acr + cp->acw + cp->ace;
2365
2366                 if (!acc)
2367                         g_part_wither(gp, ENOSYS);
2368                 else
2369                         error = EBUSY;
2370         }
2371
2372         if (!error)
2373                 TAILQ_REMOVE(&g_part_schemes, scheme, scheme_list);
2374
2375         *xchg = error;
2376 }
2377
2378 int
2379 g_part_modevent(module_t mod, int type, struct g_part_scheme *scheme)
2380 {
2381         struct g_part_scheme *iter;
2382         uintptr_t arg;
2383         int error;
2384
2385         error = 0;
2386         switch (type) {
2387         case MOD_LOAD:
2388                 TAILQ_FOREACH(iter, &g_part_schemes, scheme_list) {
2389                         if (scheme == iter) {
2390                                 printf("GEOM_PART: scheme %s is already "
2391                                     "registered!\n", scheme->name);
2392                                 break;
2393                         }
2394                 }
2395                 if (iter == NULL) {
2396                         TAILQ_INSERT_TAIL(&g_part_schemes, scheme,
2397                             scheme_list);
2398                         g_retaste(&g_part_class);
2399                 }
2400                 break;
2401         case MOD_UNLOAD:
2402                 arg = (uintptr_t)scheme;
2403                 error = g_waitfor_event(g_part_unload_event, &arg, M_WAITOK,
2404                     NULL);
2405                 if (error == 0)
2406                         error = arg;
2407                 break;
2408         default:
2409                 error = EOPNOTSUPP;
2410                 break;
2411         }
2412
2413         return (error);
2414 }