Unix/ventoy_unix_src/FreeBSD/geom_ventoy_src/10.x/sys/geom/ventoy/g_ventoy.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
   3  *
   4  * Copyright (c) 2020 longpanda <admin@ventoy.net>
   5  * Copyright (c) 2004-2005 Pawel Jakub Dawidek <pjd@FreeBSD.org>
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  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 AUTHORS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29
  30 #include <sys/cdefs.h>
  31 __FBSDID("$FreeBSD$");
  32
  33 #include <sys/param.h>
  34 #include <sys/systm.h>
  35 #include <sys/kernel.h>
  36 #include <sys/module.h>
  37 #include <sys/lock.h>
  38 #include <sys/mutex.h>
  39 #include <sys/bio.h>
  40 #include <sys/sbuf.h>
  41 #include <sys/sysctl.h>
  42 #include <sys/malloc.h>
  43 #include <geom/geom.h>
  44 #include <geom/ventoy/g_ventoy.h>
  45
  46 FEATURE(geom_ventoy, "GEOM ventoy support");
  47
  48 static MALLOC_DEFINE(M_VENTOY, "ventoy_data", "GEOM_VENTOY Data");
  49
  50 SYSCTL_DECL(_kern_geom);
  51 static SYSCTL_NODE(_kern_geom, OID_AUTO, ventoy, CTLFLAG_RW, 0,
  52     "GEOM_VENTOY stuff");
  53 static u_int g_ventoy_debug = 0;
  54 SYSCTL_UINT(_kern_geom_ventoy, OID_AUTO, debug, CTLFLAG_RWTUN, &g_ventoy_debug, 0,
  55     "Debug level");
  56
  57 extern int resource_string_value(const char *name, int unit, const char *resname, const char **result);
  58 extern int resource_int_value(const char *name, int unit, const char *resname, int *result);
  59
  60 static int g_ventoy_destroy(struct g_ventoy_softc *sc, boolean_t force);
  61 static int g_ventoy_destroy_geom(struct gctl_req *req, struct g_class *mp,
  62     struct g_geom *gp);
  63
  64 static g_taste_t g_ventoy_taste;
  65 static g_ctl_req_t g_ventoy_config;
  66 static g_dumpconf_t g_ventoy_dumpconf;
  67
  68 static const char *g_ventoy_disk_uuid = NULL;
  69 static bool g_ventoy_tasted = false;
  70 static off_t g_ventoy_disk_size = 0;
  71 static off_t g_disk_map_start = 0;
  72 static off_t g_disk_map_end = 0;
  73
  74 struct g_class g_ventoy_class = {
  75         .name = G_VENTOY_CLASS_NAME,
  76         .version = G_VERSION,
  77         .ctlreq = g_ventoy_config,
  78         .taste = g_ventoy_taste,
  79         .destroy_geom = g_ventoy_destroy_geom
  80 };
  81
  82
  83 /*
  84  * Greatest Common Divisor.
  85  */
  86 static u_int
  87 gcd(u_int a, u_int b)
  88 {
  89         u_int c;
  90
  91         while (b != 0) {
  92                 c = a;
  93                 a = b;
  94                 b = (c % b);
  95         }
  96         return (a);
  97 }
  98
  99 /*
 100  * Least Common Multiple.
 101  */
 102 static u_int
 103 lcm(u_int a, u_int b)
 104 {
 105
 106         return ((a * b) / gcd(a, b));
 107 }
 108
 109 /*
 110  * Return the number of valid disks.
 111  */
 112 static u_int
 113 g_ventoy_nvalid(struct g_ventoy_softc *sc)
 114 {
 115         u_int i, no;
 116
 117         no = 0;
 118         for (i = 0; i < sc->sc_ndisks; i++) {
 119                 if (sc->sc_disks[i].d_consumer != NULL)
 120                         no++;
 121         }
 122
 123         return (no);
 124 }
 125
 126 static void
 127 g_ventoy_remove_disk(struct g_ventoy_disk *disk)
 128 {
 129         struct g_consumer *cp;
 130         struct g_ventoy_softc *sc;
 131
 132         g_topology_assert();
 133         KASSERT(disk->d_consumer != NULL, ("Non-valid disk in %s.", __func__));
 134         sc = disk->d_softc;
 135         cp = disk->d_consumer;
 136
 137         if (!disk->d_removed) {
 138                 G_VENTOY_DEBUG(0, "Disk %s removed from %s.",
 139                     cp->provider->name, sc->sc_name);
 140                 disk->d_removed = 1;
 141         }
 142
 143         if (sc->sc_provider != NULL) {
 144                 sc->sc_provider->flags |= G_PF_WITHER;
 145                 G_VENTOY_DEBUG(0, "Device %s deactivated.",
 146                     sc->sc_provider->name);
 147                 g_orphan_provider(sc->sc_provider, ENXIO);
 148                 sc->sc_provider = NULL;
 149         }
 150
 151         if (cp->acr > 0 || cp->acw > 0 || cp->ace > 0)
 152                 return;
 153         disk->d_consumer = NULL;
 154         g_detach(cp);
 155         g_destroy_consumer(cp);
 156         /* If there are no valid disks anymore, remove device. */
 157         if (LIST_EMPTY(&sc->sc_geom->consumer))
 158                 g_ventoy_destroy(sc, 1);
 159 }
 160
 161 static void
 162 g_ventoy_orphan(struct g_consumer *cp)
 163 {
 164         struct g_ventoy_softc *sc;
 165         struct g_ventoy_disk *disk;
 166         struct g_geom *gp;
 167
 168         g_topology_assert();
 169         gp = cp->geom;
 170         sc = gp->softc;
 171         if (sc == NULL)
 172                 return;
 173
 174         disk = cp->private;
 175         if (disk == NULL)       /* Possible? */
 176                 return;
 177         g_ventoy_remove_disk(disk);
 178 }
 179
 180 static int
 181 g_ventoy_access(struct g_provider *pp, int dr, int dw, int de)
 182 {
 183         struct g_consumer *cp1, *cp2, *tmp;
 184         struct g_ventoy_disk *disk;
 185         struct g_geom *gp;
 186         int error;
 187
 188     if (dw > 0) /* readonly */
 189                 return (EPERM);
 190
 191         g_topology_assert();
 192         gp = pp->geom;
 193
 194         /* On first open, grab an extra "exclusive" bit */
 195         if (pp->acr == 0 && pp->acw == 0 && pp->ace == 0)
 196                 de++;
 197         /* ... and let go of it on last close */
 198         if ((pp->acr + dr) == 0 && (pp->acw + dw) == 0 && (pp->ace + de) == 0)
 199                 de--;
 200
 201         LIST_FOREACH_SAFE(cp1, &gp->consumer, consumer, tmp) {
 202                 error = g_access(cp1, dr, dw, de);
 203                 if (error != 0)
 204                         goto fail;
 205                 disk = cp1->private;
 206                 if (cp1->acr == 0 && cp1->acw == 0 && cp1->ace == 0 &&
 207                     disk->d_removed) {
 208                         g_ventoy_remove_disk(disk); /* May destroy geom. */
 209                 }
 210         }
 211         return (0);
 212
 213 fail:
 214         LIST_FOREACH(cp2, &gp->consumer, consumer) {
 215                 if (cp1 == cp2)
 216                         break;
 217                 g_access(cp2, -dr, -dw, -de);
 218         }
 219         return (error);
 220 }
 221
 222 static void
 223 g_ventoy_kernel_dump(struct bio *bp)
 224 {
 225         struct g_ventoy_softc *sc;
 226         struct g_ventoy_disk *disk;
 227         struct bio *cbp;
 228         struct g_kerneldump *gkd;
 229         u_int i;
 230
 231         sc = bp->bio_to->geom->softc;
 232         gkd = (struct g_kerneldump *)bp->bio_data;
 233         for (i = 0; i < sc->sc_ndisks; i++) {
 234                 if (sc->sc_disks[i].d_start <= gkd->offset &&
 235                     sc->sc_disks[i].d_end > gkd->offset)
 236                         break;
 237         }
 238         if (i == sc->sc_ndisks)
 239                 g_io_deliver(bp, EOPNOTSUPP);
 240         disk = &sc->sc_disks[i];
 241         gkd->offset -= disk->d_start;
 242         if (gkd->length > disk->d_end - disk->d_start - gkd->offset)
 243                 gkd->length = disk->d_end - disk->d_start - gkd->offset;
 244         cbp = g_clone_bio(bp);
 245         if (cbp == NULL) {
 246                 g_io_deliver(bp, ENOMEM);
 247                 return;
 248         }
 249         cbp->bio_done = g_std_done;
 250         g_io_request(cbp, disk->d_consumer);
 251         G_VENTOY_DEBUG(1, "Kernel dump will go to %s.",
 252             disk->d_consumer->provider->name);
 253 }
 254
 255 static void
 256 g_ventoy_flush(struct g_ventoy_softc *sc, struct bio *bp)
 257 {
 258         struct bio_queue_head queue;
 259         struct g_consumer *cp;
 260         struct bio *cbp;
 261         u_int no;
 262
 263         bioq_init(&queue);
 264         for (no = 0; no < sc->sc_ndisks; no++) {
 265                 cbp = g_clone_bio(bp);
 266                 if (cbp == NULL) {
 267                         for (cbp = bioq_first(&queue); cbp != NULL;
 268                             cbp = bioq_first(&queue)) {
 269                                 bioq_remove(&queue, cbp);
 270                                 g_destroy_bio(cbp);
 271                         }
 272                         if (bp->bio_error == 0)
 273                                 bp->bio_error = ENOMEM;
 274                         g_io_deliver(bp, bp->bio_error);
 275                         return;
 276                 }
 277                 bioq_insert_tail(&queue, cbp);
 278                 cbp->bio_done = g_std_done;
 279                 cbp->bio_caller1 = sc->sc_disks[no].d_consumer;
 280                 cbp->bio_to = sc->sc_disks[no].d_consumer->provider;
 281         }
 282         for (cbp = bioq_first(&queue); cbp != NULL; cbp = bioq_first(&queue)) {
 283                 bioq_remove(&queue, cbp);
 284                 G_VENTOY_LOGREQ(cbp, "Sending request.");
 285                 cp = cbp->bio_caller1;
 286                 cbp->bio_caller1 = NULL;
 287                 g_io_request(cbp, cp);
 288         }
 289 }
 290
 291 static void
 292 g_ventoy_start(struct bio *bp)
 293 {
 294         struct bio_queue_head queue;
 295         struct g_ventoy_softc *sc;
 296         struct g_ventoy_disk *disk;
 297         struct g_provider *pp;
 298         off_t offset, end, length, off, len;
 299         struct bio *cbp;
 300         char *addr;
 301         u_int no;
 302
 303         pp = bp->bio_to;
 304         sc = pp->geom->softc;
 305         /*
 306          * If sc == NULL, provider's error should be set and g_ventoy_start()
 307          * should not be called at all.
 308          */
 309         KASSERT(sc != NULL,
 310             ("Provider's error should be set (error=%d)(device=%s).",
 311             bp->bio_to->error, bp->bio_to->name));
 312
 313         G_VENTOY_LOGREQ(bp, "Request received.");
 314
 315         switch (bp->bio_cmd) {
 316         case BIO_READ:
 317         case BIO_WRITE:
 318         case BIO_DELETE:
 319                 break;
 320         case BIO_FLUSH:
 321                 g_ventoy_flush(sc, bp);
 322                 return;
 323         case BIO_GETATTR:
 324                 if (strcmp("GEOM::kerneldump", bp->bio_attribute) == 0) {
 325                         g_ventoy_kernel_dump(bp);
 326                         return;
 327                 }
 328                 /* To which provider it should be delivered? */
 329                 /* FALLTHROUGH */
 330         default:
 331                 g_io_deliver(bp, EOPNOTSUPP);
 332                 return;
 333         }
 334
 335         offset = bp->bio_offset;
 336         length = bp->bio_length;
 337         addr = bp->bio_data;
 338         end = offset + length;
 339
 340         bioq_init(&queue);
 341         for (no = 0; no < sc->sc_ndisks; no++) {
 342                 disk = &sc->sc_disks[no];
 343                 if (disk->d_end <= offset)
 344                         continue;
 345                 if (disk->d_start >= end)
 346                         break;
 347
 348                 off = offset - disk->d_start;
 349                 len = MIN(length, disk->d_end - offset);
 350                 length -= len;
 351                 offset += len;
 352
 353                 cbp = g_clone_bio(bp);
 354                 if (cbp == NULL) {
 355                         for (cbp = bioq_first(&queue); cbp != NULL;
 356                             cbp = bioq_first(&queue)) {
 357                                 bioq_remove(&queue, cbp);
 358                                 g_destroy_bio(cbp);
 359                         }
 360                         if (bp->bio_error == 0)
 361                                 bp->bio_error = ENOMEM;
 362                         g_io_deliver(bp, bp->bio_error);
 363                         return;
 364                 }
 365                 bioq_insert_tail(&queue, cbp);
 366                 /*
 367                  * Fill in the component buf structure.
 368                  */
 369         cbp->bio_done = g_std_done;
 370                 cbp->bio_offset = off + disk->d_map_start;
 371         cbp->bio_data = addr;
 372                 addr += len;
 373         cbp->bio_length = len;
 374                 cbp->bio_to = disk->d_consumer->provider;
 375                 cbp->bio_caller1 = disk;
 376
 377                 if (length == 0)
 378                         break;
 379         }
 380         KASSERT(length == 0,
 381             ("Length is still greater than 0 (class=%s, name=%s).",
 382             bp->bio_to->geom->class->name, bp->bio_to->geom->name));
 383         for (cbp = bioq_first(&queue); cbp != NULL; cbp = bioq_first(&queue)) {
 384                 bioq_remove(&queue, cbp);
 385                 G_VENTOY_LOGREQ(cbp, "Sending request.");
 386                 disk = cbp->bio_caller1;
 387                 cbp->bio_caller1 = NULL;
 388                 g_io_request(cbp, disk->d_consumer);
 389         }
 390 }
 391
 392 static void
 393 g_ventoy_check_and_run(struct g_ventoy_softc *sc)
 394 {
 395         struct g_ventoy_disk *disk;
 396         struct g_provider *dp, *pp;
 397         u_int no, sectorsize = 0;
 398         off_t start;
 399
 400         g_topology_assert();
 401         if (g_ventoy_nvalid(sc) != sc->sc_ndisks)
 402                 return;
 403
 404         pp = g_new_providerf(sc->sc_geom, "ventoy/%s", sc->sc_name);
 405         start = 0;
 406         for (no = 0; no < sc->sc_ndisks; no++) {
 407                 disk = &sc->sc_disks[no];
 408                 dp = disk->d_consumer->provider;
 409                 disk->d_start = start;
 410                 disk->d_end = disk->d_start + (disk->d_map_end - disk->d_map_start);
 411                 if (sc->sc_type == G_VENTOY_TYPE_AUTOMATIC)
 412                         disk->d_end -= dp->sectorsize;
 413                 start = disk->d_end;
 414                 if (no == 0)
 415                         sectorsize = dp->sectorsize;
 416                 else {
 417                         sectorsize = lcm(sectorsize, dp->sectorsize);
 418
 419                 }
 420         }
 421         pp->sectorsize = sectorsize;
 422         /* We have sc->sc_disks[sc->sc_ndisks - 1].d_end in 'start'. */
 423         pp->mediasize = start;
 424         pp->stripesize = sc->sc_disks[0].d_consumer->provider->stripesize;
 425         pp->stripeoffset = sc->sc_disks[0].d_consumer->provider->stripeoffset;
 426         sc->sc_provider = pp;
 427         g_error_provider(pp, 0);
 428
 429         G_VENTOY_DEBUG(0, "Device %s activated.", sc->sc_provider->name);
 430 }
 431
 432 static int
 433 g_ventoy_read_metadata(struct g_consumer *cp, struct g_ventoy_metadata *md)
 434 {
 435         struct g_provider *pp;
 436         u_char *buf;
 437         int error;
 438
 439         g_topology_assert();
 440
 441         error = g_access(cp, 1, 0, 0);
 442         if (error != 0)
 443                 return (error);
 444         pp = cp->provider;
 445         g_topology_unlock();
 446         buf = g_read_data(cp, pp->mediasize - pp->sectorsize, pp->sectorsize,
 447             &error);
 448         g_topology_lock();
 449         g_access(cp, -1, 0, 0);
 450         if (buf == NULL)
 451                 return (error);
 452
 453         /* Decode metadata. */
 454         ventoy_metadata_decode(buf, md);
 455         g_free(buf);
 456
 457         return (0);
 458 }
 459
 460 /*
 461  * Add disk to given device.
 462  */
 463 static int
 464 g_ventoy_add_disk(struct g_ventoy_softc *sc, struct g_provider *pp, u_int no)
 465 {
 466         struct g_ventoy_disk *disk;
 467         struct g_consumer *cp, *fcp;
 468         struct g_geom *gp;
 469         int error;
 470
 471         g_topology_assert();
 472         /* Metadata corrupted? */
 473         if (no >= sc->sc_ndisks)
 474                 return (EINVAL);
 475
 476         disk = &sc->sc_disks[no];
 477         /* Check if disk is not already attached. */
 478         if (disk->d_consumer != NULL)
 479                 return (EEXIST);
 480
 481         gp = sc->sc_geom;
 482         fcp = LIST_FIRST(&gp->consumer);
 483
 484         cp = g_new_consumer(gp);
 485         error = g_attach(cp, pp);
 486         if (error != 0) {
 487                 g_destroy_consumer(cp);
 488                 return (error);
 489         }
 490
 491         if (fcp != NULL && (fcp->acr > 0 || fcp->acw > 0 || fcp->ace > 0)) {
 492                 error = g_access(cp, fcp->acr, fcp->acw, fcp->ace);
 493                 if (error != 0) {
 494                         g_detach(cp);
 495                         g_destroy_consumer(cp);
 496                         return (error);
 497                 }
 498         }
 499         if (sc->sc_type == G_VENTOY_TYPE_AUTOMATIC) {
 500                 struct g_ventoy_metadata md;
 501
 502                 /* Re-read metadata. */
 503                 error = g_ventoy_read_metadata(cp, &md);
 504                 if (error != 0)
 505                         goto fail;
 506
 507                 if (strcmp(md.md_magic, G_VENTOY_MAGIC) != 0 ||
 508                     strcmp(md.md_name, sc->sc_name) != 0 ||
 509                     md.md_id != sc->sc_id) {
 510                         G_VENTOY_DEBUG(0, "Metadata on %s changed.", pp->name);
 511                         goto fail;
 512                 }
 513         }
 514
 515         cp->private = disk;
 516         disk->d_consumer = cp;
 517         disk->d_softc = sc;
 518         disk->d_start = 0;      /* not yet */
 519         disk->d_end = 0;        /* not yet */
 520         disk->d_removed = 0;
 521
 522         disk->d_map_start = g_disk_map_start;
 523         disk->d_map_end = g_disk_map_end;
 524
 525         G_VENTOY_DEBUG(0, "Disk %s attached to %s.", pp->name, sc->sc_name);
 526
 527         g_ventoy_check_and_run(sc);
 528
 529         return (0);
 530 fail:
 531         if (fcp != NULL && (fcp->acr > 0 || fcp->acw > 0 || fcp->ace > 0))
 532                 g_access(cp, -fcp->acr, -fcp->acw, -fcp->ace);
 533         g_detach(cp);
 534         g_destroy_consumer(cp);
 535         return (error);
 536 }
 537
 538 static struct g_geom *
 539 g_ventoy_create(struct g_class *mp, const struct g_ventoy_metadata *md,
 540     u_int type)
 541 {
 542         struct g_ventoy_softc *sc;
 543         struct g_geom *gp;
 544         u_int no;
 545
 546         G_VENTOY_DEBUG(1, "Creating device %s (id=%u).", md->md_name,
 547             md->md_id);
 548
 549         /* One disks is minimum. */
 550         if (md->md_all < 1)
 551                 return (NULL);
 552
 553         /* Check for duplicate unit */
 554         LIST_FOREACH(gp, &mp->geom, geom) {
 555                 sc = gp->softc;
 556                 if (sc != NULL && strcmp(sc->sc_name, md->md_name) == 0) {
 557                         G_VENTOY_DEBUG(0, "Device %s already configured.",
 558                             gp->name);
 559                         return (NULL);
 560                 }
 561         }
 562         gp = g_new_geomf(mp, "%s", md->md_name);
 563         sc = malloc(sizeof(*sc), M_VENTOY, M_WAITOK | M_ZERO);
 564         gp->start = g_ventoy_start;
 565         gp->spoiled = g_ventoy_orphan;
 566         gp->orphan = g_ventoy_orphan;
 567         gp->access = g_ventoy_access;
 568         gp->dumpconf = g_ventoy_dumpconf;
 569
 570         sc->sc_id = md->md_id;
 571         sc->sc_ndisks = md->md_all;
 572         sc->sc_disks = malloc(sizeof(struct g_ventoy_disk) * sc->sc_ndisks,
 573             M_VENTOY, M_WAITOK | M_ZERO);
 574         for (no = 0; no < sc->sc_ndisks; no++)
 575                 sc->sc_disks[no].d_consumer = NULL;
 576         sc->sc_type = type;
 577
 578         gp->softc = sc;
 579         sc->sc_geom = gp;
 580         sc->sc_provider = NULL;
 581
 582         G_VENTOY_DEBUG(0, "Device %s created (id=%u).", sc->sc_name, sc->sc_id);
 583
 584         return (gp);
 585 }
 586
 587 static int
 588 g_ventoy_destroy(struct g_ventoy_softc *sc, boolean_t force)
 589 {
 590         struct g_provider *pp;
 591         struct g_consumer *cp, *cp1;
 592         struct g_geom *gp;
 593
 594         g_topology_assert();
 595
 596         if (sc == NULL)
 597                 return (ENXIO);
 598
 599         pp = sc->sc_provider;
 600         if (pp != NULL && (pp->acr != 0 || pp->acw != 0 || pp->ace != 0)) {
 601                 if (force) {
 602                         G_VENTOY_DEBUG(0, "Device %s is still open, so it "
 603                             "can't be definitely removed.", pp->name);
 604                 } else {
 605                         G_VENTOY_DEBUG(1,
 606                             "Device %s is still open (r%dw%de%d).", pp->name,
 607                             pp->acr, pp->acw, pp->ace);
 608                         return (EBUSY);
 609                 }
 610         }
 611
 612         gp = sc->sc_geom;
 613         LIST_FOREACH_SAFE(cp, &gp->consumer, consumer, cp1) {
 614                 g_ventoy_remove_disk(cp->private);
 615                 if (cp1 == NULL)
 616                         return (0);     /* Recursion happened. */
 617         }
 618         if (!LIST_EMPTY(&gp->consumer))
 619                 return (EINPROGRESS);
 620
 621         gp->softc = NULL;
 622         KASSERT(sc->sc_provider == NULL, ("Provider still exists? (device=%s)",
 623             gp->name));
 624         free(sc->sc_disks, M_VENTOY);
 625         free(sc, M_VENTOY);
 626
 627         G_VENTOY_DEBUG(0, "Device %s destroyed.", gp->name);
 628         g_wither_geom(gp, ENXIO);
 629         return (0);
 630 }
 631
 632 static int
 633 g_ventoy_destroy_geom(struct gctl_req *req __unused,
 634     struct g_class *mp __unused, struct g_geom *gp)
 635 {
 636         struct g_ventoy_softc *sc;
 637
 638         sc = gp->softc;
 639         return (g_ventoy_destroy(sc, 0));
 640 }
 641
 642 static bool g_vtoy_check_disk(struct g_class *mp, struct g_provider *pp)
 643 {
 644     int i;
 645     uint8_t *buf;
 646     char uuid[64];
 647     const char *value;
 648     struct g_consumer *cp;
 649         struct g_geom *gp;
 650
 651     if (g_ventoy_disk_size == 0)
 652     {
 653         if (resource_string_value("ventoy", 0, "disksize", &value) == 0)
 654         {
 655             G_DEBUG("ventoy.disksize: %s\n", value);
 656             g_ventoy_disk_size = strtouq(value, NULL, 0);
 657         }
 658
 659         if (resource_string_value("ventoy", 0, "diskuuid", &g_ventoy_disk_uuid) == 0)
 660         {
 661             G_DEBUG("ventoy.diskuuid: <%s>\n", g_ventoy_disk_uuid);
 662         }
 663     }
 664
 665     if (g_ventoy_disk_size != pp->mediasize)
 666     {
 667         return false;
 668     }
 669
 670     if (strncmp(pp->name, "cd", 2) == 0 || strchr(pp->name, '/'))
 671     {
 672         return false;
 673     }
 674
 675     /* read UUID from disk */
 676     gp = g_new_geomf(mp, "ventoy:taste");
 677         gp->start = NULL;
 678         gp->access = g_ventoy_access;
 679         gp->orphan = g_ventoy_orphan;
 680         cp = g_new_consumer(gp);
 681         g_attach(cp, pp);
 682
 683     g_access(cp, 1, 0, 0);
 684         g_topology_unlock();
 685         buf = g_read_data(cp, 0, pp->sectorsize, NULL);
 686         g_topology_lock();
 687         g_access(cp, -1, 0, 0);
 688
 689     g_detach(cp);
 690         g_destroy_consumer(cp);
 691         g_destroy_geom(gp);
 692         gp = NULL;
 693
 694     if (!buf)
 695     {
 696         return false;
 697     }
 698
 699     for (i = 0; i < 16; i++)
 700     {
 701         sprintf(uuid + i * 2, "%02x", buf[0x180 + i]);
 702     }
 703     g_free(buf);
 704
 705     if (strncmp(g_ventoy_disk_uuid, uuid, 32) == 0)
 706     {
 707         return true;
 708     }
 709
 710     return false;
 711 }
 712
 713 static struct g_geom *
 714 g_ventoy_taste(struct g_class *mp, struct g_provider *pp, int flags __unused)
 715 {
 716     int i;
 717         int error;
 718     int disknum;
 719     char *endpos;
 720     const char *value;
 721         struct g_geom *gp;
 722         struct g_ventoy_metadata md;
 723         struct g_ventoy_softc *sc;
 724
 725     if (g_ventoy_tasted)
 726     {
 727         return NULL;
 728     }
 729
 730         G_DEBUG("%s(%s, %s)\n", __func__, mp->name, pp->name);
 731         g_topology_assert();
 732
 733         /* Skip providers that are already open for writing. */
 734         if (pp->acw > 0)
 735                 return (NULL);
 736
 737     if (!g_vtoy_check_disk(mp, pp))
 738     {
 739         return NULL;
 740     }
 741
 742     g_ventoy_tasted = true;
 743
 744     G_DEBUG("######### ventoy disk <%s> #############\n", pp->name);
 745
 746     resource_int_value("ventoy", 0, "segnum", &disknum);
 747
 748     strlcpy(md.md_magic, G_VENTOY_MAGIC, sizeof(md.md_magic));
 749         md.md_version = G_VENTOY_VERSION;
 750         strlcpy(md.md_name, "IMAGE", sizeof(md.md_name));
 751         md.md_id = arc4random();
 752         md.md_no = 0;
 753         md.md_all = (uint16_t)disknum;
 754         bzero(md.md_provider, sizeof(md.md_provider));
 755         /* This field is not important here. */
 756         md.md_provsize = 0;
 757
 758         gp = g_ventoy_create(mp, &md, G_VENTOY_TYPE_MANUAL);
 759         if (gp == NULL) {
 760                 G_VENTOY_DEBUG(0, "Cannot create device %s.",
 761                     md.md_name);
 762                 return (NULL);
 763         }
 764         sc = gp->softc;
 765
 766     for (i = 0; i < disknum; i ++)
 767     {
 768         if (resource_string_value("ventoy", i, "seg", &value) == 0)
 769         {
 770             g_disk_map_start = strtouq(value, &endpos, 0);
 771             g_disk_map_end = strtouq(endpos + 1, NULL, 0);
 772         }
 773         else
 774         {
 775             printf("Failed to parse ventoy seg %d\n", i);
 776             continue;
 777         }
 778
 779         G_DEBUG("ventoy segment%d: %s\n", i, value);
 780
 781         G_VENTOY_DEBUG(1, "Adding disk %s to %s.", pp->name, gp->name);
 782         error = g_ventoy_add_disk(sc, pp, i);
 783         if (error != 0) {
 784                 G_VENTOY_DEBUG(0,
 785                     "Cannot add disk %s to %s (error=%d).", pp->name,
 786                     gp->name, error);
 787                 g_ventoy_destroy(sc, 1);
 788                 return (NULL);
 789         }
 790
 791         g_disk_map_start = 0;
 792         g_disk_map_end = 0;
 793     }
 794
 795         return (gp);
 796 }
 797
 798 static void
 799 g_ventoy_ctl_create(struct gctl_req *req, struct g_class *mp)
 800 {
 801         u_int attached, no;
 802         struct g_ventoy_metadata md;
 803         struct g_provider *pp;
 804         struct g_ventoy_softc *sc;
 805         struct g_geom *gp;
 806         struct sbuf *sb;
 807         const char *name;
 808         char param[16];
 809         int *nargs;
 810
 811         g_topology_assert();
 812         nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs));
 813         if (nargs == NULL) {
 814                 gctl_error(req, "No '%s' argument.", "nargs");
 815                 return;
 816         }
 817         if (*nargs < 2) {
 818                 gctl_error(req, "Too few arguments.");
 819                 return;
 820         }
 821
 822         strlcpy(md.md_magic, G_VENTOY_MAGIC, sizeof(md.md_magic));
 823         md.md_version = G_VENTOY_VERSION;
 824         name = gctl_get_asciiparam(req, "arg0");
 825         if (name == NULL) {
 826                 gctl_error(req, "No 'arg%u' argument.", 0);
 827                 return;
 828         }
 829         strlcpy(md.md_name, name, sizeof(md.md_name));
 830         md.md_id = arc4random();
 831         md.md_no = 0;
 832         md.md_all = *nargs - 1;
 833         bzero(md.md_provider, sizeof(md.md_provider));
 834         /* This field is not important here. */
 835         md.md_provsize = 0;
 836
 837         /* Check all providers are valid */
 838         for (no = 1; no < *nargs; no++) {
 839                 snprintf(param, sizeof(param), "arg%u", no);
 840                 name = gctl_get_asciiparam(req, param);
 841                 if (name == NULL) {
 842                         gctl_error(req, "No 'arg%u' argument.", no);
 843                         return;
 844                 }
 845                 if (strncmp(name, "/dev/", strlen("/dev/")) == 0)
 846                         name += strlen("/dev/");
 847                 pp = g_provider_by_name(name);
 848                 if (pp == NULL) {
 849                         G_VENTOY_DEBUG(1, "Disk %s is invalid.", name);
 850                         gctl_error(req, "Disk %s is invalid.", name);
 851                         return;
 852                 }
 853         }
 854
 855         gp = g_ventoy_create(mp, &md, G_VENTOY_TYPE_MANUAL);
 856         if (gp == NULL) {
 857                 gctl_error(req, "Can't configure %s.", md.md_name);
 858                 return;
 859         }
 860
 861         sc = gp->softc;
 862         sb = sbuf_new_auto();
 863         sbuf_printf(sb, "Can't attach disk(s) to %s:", gp->name);
 864         for (attached = 0, no = 1; no < *nargs; no++) {
 865                 snprintf(param, sizeof(param), "arg%u", no);
 866                 name = gctl_get_asciiparam(req, param);
 867                 if (name == NULL) {
 868                         gctl_error(req, "No 'arg%d' argument.", no);
 869                         return;
 870                 }
 871                 if (strncmp(name, "/dev/", strlen("/dev/")) == 0)
 872                         name += strlen("/dev/");
 873                 pp = g_provider_by_name(name);
 874                 KASSERT(pp != NULL, ("Provider %s disappear?!", name));
 875                 if (g_ventoy_add_disk(sc, pp, no - 1) != 0) {
 876                         G_VENTOY_DEBUG(1, "Disk %u (%s) not attached to %s.",
 877                             no, pp->name, gp->name);
 878                         sbuf_printf(sb, " %s", pp->name);
 879                         continue;
 880                 }
 881                 attached++;
 882         }
 883         sbuf_finish(sb);
 884         if (md.md_all != attached) {
 885                 g_ventoy_destroy(gp->softc, 1);
 886                 gctl_error(req, "%s", sbuf_data(sb));
 887         }
 888         sbuf_delete(sb);
 889 }
 890
 891 static struct g_ventoy_softc *
 892 g_ventoy_find_device(struct g_class *mp, const char *name)
 893 {
 894         struct g_ventoy_softc *sc;
 895         struct g_geom *gp;
 896
 897         LIST_FOREACH(gp, &mp->geom, geom) {
 898                 sc = gp->softc;
 899                 if (sc == NULL)
 900                         continue;
 901                 if (strcmp(sc->sc_name, name) == 0)
 902                         return (sc);
 903         }
 904         return (NULL);
 905 }
 906
 907 static void
 908 g_ventoy_ctl_destroy(struct gctl_req *req, struct g_class *mp)
 909 {
 910         struct g_ventoy_softc *sc;
 911         int *force, *nargs, error;
 912         const char *name;
 913         char param[16];
 914         u_int i;
 915
 916         g_topology_assert();
 917
 918         nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs));
 919         if (nargs == NULL) {
 920                 gctl_error(req, "No '%s' argument.", "nargs");
 921                 return;
 922         }
 923         if (*nargs <= 0) {
 924                 gctl_error(req, "Missing device(s).");
 925                 return;
 926         }
 927         force = gctl_get_paraml(req, "force", sizeof(*force));
 928         if (force == NULL) {
 929                 gctl_error(req, "No '%s' argument.", "force");
 930                 return;
 931         }
 932
 933         for (i = 0; i < (u_int)*nargs; i++) {
 934                 snprintf(param, sizeof(param), "arg%u", i);
 935                 name = gctl_get_asciiparam(req, param);
 936                 if (name == NULL) {
 937                         gctl_error(req, "No 'arg%u' argument.", i);
 938                         return;
 939                 }
 940                 sc = g_ventoy_find_device(mp, name);
 941                 if (sc == NULL) {
 942                         gctl_error(req, "No such device: %s.", name);
 943                         return;
 944                 }
 945                 error = g_ventoy_destroy(sc, *force);
 946                 if (error != 0) {
 947                         gctl_error(req, "Cannot destroy device %s (error=%d).",
 948                             sc->sc_name, error);
 949                         return;
 950                 }
 951         }
 952 }
 953
 954 static void
 955 g_ventoy_config(struct gctl_req *req, struct g_class *mp, const char *verb)
 956 {
 957         uint32_t *version;
 958
 959     return;
 960
 961         g_topology_assert();
 962
 963         version = gctl_get_paraml(req, "version", sizeof(*version));
 964         if (version == NULL) {
 965                 gctl_error(req, "No '%s' argument.", "version");
 966                 return;
 967         }
 968         if (*version != G_VENTOY_VERSION) {
 969                 gctl_error(req, "Userland and kernel parts are out of sync.");
 970                 return;
 971         }
 972
 973         if (strcmp(verb, "create") == 0) {
 974                 g_ventoy_ctl_create(req, mp);
 975                 return;
 976         } else if (strcmp(verb, "destroy") == 0 ||
 977             strcmp(verb, "stop") == 0) {
 978                 g_ventoy_ctl_destroy(req, mp);
 979                 return;
 980         }
 981         gctl_error(req, "Unknown verb.");
 982 }
 983
 984 static void
 985 g_ventoy_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp,
 986     struct g_consumer *cp, struct g_provider *pp)
 987 {
 988         struct g_ventoy_softc *sc;
 989
 990         g_topology_assert();
 991         sc = gp->softc;
 992         if (sc == NULL)
 993                 return;
 994         if (pp != NULL) {
 995                 /* Nothing here. */
 996         } else if (cp != NULL) {
 997                 struct g_ventoy_disk *disk;
 998
 999                 disk = cp->private;
1000                 if (disk == NULL)
1001                         return;
1002                 sbuf_printf(sb, "%s<End>%jd</End>\n", indent,
1003                     (intmax_t)disk->d_end);
1004                 sbuf_printf(sb, "%s<Start>%jd</Start>\n", indent,
1005                     (intmax_t)disk->d_start);
1006         } else {
1007                 sbuf_printf(sb, "%s<ID>%u</ID>\n", indent, (u_int)sc->sc_id);
1008                 sbuf_printf(sb, "%s<Type>", indent);
1009                 switch (sc->sc_type) {
1010                 case G_VENTOY_TYPE_AUTOMATIC:
1011                         sbuf_cat(sb, "AUTOMATIC");
1012                         break;
1013                 case G_VENTOY_TYPE_MANUAL:
1014                         sbuf_cat(sb, "MANUAL");
1015                         break;
1016                 default:
1017                         sbuf_cat(sb, "UNKNOWN");
1018                         break;
1019                 }
1020                 sbuf_cat(sb, "</Type>\n");
1021                 sbuf_printf(sb, "%s<Status>Total=%u, Online=%u</Status>\n",
1022                     indent, sc->sc_ndisks, g_ventoy_nvalid(sc));
1023                 sbuf_printf(sb, "%s<State>", indent);
1024                 if (sc->sc_provider != NULL && sc->sc_provider->error == 0)
1025                         sbuf_cat(sb, "UP");
1026                 else
1027                         sbuf_cat(sb, "DOWN");
1028                 sbuf_cat(sb, "</State>\n");
1029         }
1030 }
1031
1032 DECLARE_GEOM_CLASS(g_ventoy_class, g_ventoy);