Unix/ventoy_unix_src/FreeBSD/geom_ventoy_src/12.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                 G_VENTOY_DEBUG(0, "Device %s deactivated.",
 145                     sc->sc_provider->name);
 146                 g_wither_provider(sc->sc_provider, ENXIO);
 147                 sc->sc_provider = NULL;
 148         }
 149
 150         if (cp->acr > 0 || cp->acw > 0 || cp->ace > 0)
 151                 return;
 152         disk->d_consumer = NULL;
 153         g_detach(cp);
 154         g_destroy_consumer(cp);
 155         /* If there are no valid disks anymore, remove device. */
 156         if (LIST_EMPTY(&sc->sc_geom->consumer))
 157                 g_ventoy_destroy(sc, 1);
 158 }
 159
 160 static void
 161 g_ventoy_orphan(struct g_consumer *cp)
 162 {
 163         struct g_ventoy_softc *sc;
 164         struct g_ventoy_disk *disk;
 165         struct g_geom *gp;
 166
 167         g_topology_assert();
 168         gp = cp->geom;
 169         sc = gp->softc;
 170         if (sc == NULL)
 171                 return;
 172
 173         disk = cp->private;
 174         if (disk == NULL)       /* Possible? */
 175                 return;
 176         g_ventoy_remove_disk(disk);
 177 }
 178
 179 static int
 180 g_ventoy_access(struct g_provider *pp, int dr, int dw, int de)
 181 {
 182         struct g_consumer *cp1, *cp2, *tmp;
 183         struct g_ventoy_disk *disk;
 184         struct g_geom *gp;
 185         int error;
 186
 187     if (dw > 0) /* readonly */
 188                 return (EPERM);
 189
 190         g_topology_assert();
 191         gp = pp->geom;
 192
 193         /* On first open, grab an extra "exclusive" bit */
 194         if (pp->acr == 0 && pp->acw == 0 && pp->ace == 0)
 195                 de++;
 196         /* ... and let go of it on last close */
 197         if ((pp->acr + dr) == 0 && (pp->acw + dw) == 0 && (pp->ace + de) == 0)
 198                 de--;
 199
 200         LIST_FOREACH_SAFE(cp1, &gp->consumer, consumer, tmp) {
 201                 error = g_access(cp1, dr, dw, de);
 202                 if (error != 0)
 203                         goto fail;
 204                 disk = cp1->private;
 205                 if (cp1->acr == 0 && cp1->acw == 0 && cp1->ace == 0 &&
 206                     disk->d_removed) {
 207                         g_ventoy_remove_disk(disk); /* May destroy geom. */
 208                 }
 209         }
 210         return (0);
 211
 212 fail:
 213         LIST_FOREACH(cp2, &gp->consumer, consumer) {
 214                 if (cp1 == cp2)
 215                         break;
 216                 g_access(cp2, -dr, -dw, -de);
 217         }
 218         return (error);
 219 }
 220
 221 static void
 222 g_ventoy_kernel_dump(struct bio *bp)
 223 {
 224         struct g_ventoy_softc *sc;
 225         struct g_ventoy_disk *disk;
 226         struct bio *cbp;
 227         struct g_kerneldump *gkd;
 228         u_int i;
 229
 230         sc = bp->bio_to->geom->softc;
 231         gkd = (struct g_kerneldump *)bp->bio_data;
 232         for (i = 0; i < sc->sc_ndisks; i++) {
 233                 if (sc->sc_disks[i].d_start <= gkd->offset &&
 234                     sc->sc_disks[i].d_end > gkd->offset)
 235                         break;
 236         }
 237         if (i == sc->sc_ndisks)
 238                 g_io_deliver(bp, EOPNOTSUPP);
 239         disk = &sc->sc_disks[i];
 240         gkd->offset -= disk->d_start;
 241         if (gkd->length > disk->d_end - disk->d_start - gkd->offset)
 242                 gkd->length = disk->d_end - disk->d_start - gkd->offset;
 243         cbp = g_clone_bio(bp);
 244         if (cbp == NULL) {
 245                 g_io_deliver(bp, ENOMEM);
 246                 return;
 247         }
 248         cbp->bio_done = g_std_done;
 249         g_io_request(cbp, disk->d_consumer);
 250         G_VENTOY_DEBUG(1, "Kernel dump will go to %s.",
 251             disk->d_consumer->provider->name);
 252 }
 253
 254 static void
 255 g_ventoy_done(struct bio *bp)
 256 {
 257         struct g_ventoy_softc *sc;
 258         struct bio *pbp;
 259
 260         pbp = bp->bio_parent;
 261         sc = pbp->bio_to->geom->softc;
 262         mtx_lock(&sc->sc_lock);
 263         if (pbp->bio_error == 0)
 264                 pbp->bio_error = bp->bio_error;
 265         pbp->bio_completed += bp->bio_completed;
 266         pbp->bio_inbed++;
 267         if (pbp->bio_children == pbp->bio_inbed) {
 268                 mtx_unlock(&sc->sc_lock);
 269                 g_io_deliver(pbp, pbp->bio_error);
 270         } else
 271                 mtx_unlock(&sc->sc_lock);
 272         g_destroy_bio(bp);
 273 }
 274
 275 static void
 276 g_ventoy_flush(struct g_ventoy_softc *sc, struct bio *bp)
 277 {
 278         struct bio_queue_head queue;
 279         struct g_consumer *cp;
 280         struct bio *cbp;
 281         u_int no;
 282
 283         bioq_init(&queue);
 284         for (no = 0; no < sc->sc_ndisks; no++) {
 285                 cbp = g_clone_bio(bp);
 286                 if (cbp == NULL) {
 287                         while ((cbp = bioq_takefirst(&queue)) != NULL)
 288                                 g_destroy_bio(cbp);
 289                         if (bp->bio_error == 0)
 290                                 bp->bio_error = ENOMEM;
 291                         g_io_deliver(bp, bp->bio_error);
 292                         return;
 293                 }
 294                 bioq_insert_tail(&queue, cbp);
 295                 cbp->bio_done = g_ventoy_done;
 296                 cbp->bio_caller1 = sc->sc_disks[no].d_consumer;
 297                 cbp->bio_to = sc->sc_disks[no].d_consumer->provider;
 298         }
 299         while ((cbp = bioq_takefirst(&queue)) != NULL) {
 300                 G_VENTOY_LOGREQ(cbp, "Sending request.");
 301                 cp = cbp->bio_caller1;
 302                 cbp->bio_caller1 = NULL;
 303                 g_io_request(cbp, cp);
 304         }
 305 }
 306
 307 static void
 308 g_ventoy_start(struct bio *bp)
 309 {
 310         struct bio_queue_head queue;
 311         struct g_ventoy_softc *sc;
 312         struct g_ventoy_disk *disk;
 313         struct g_provider *pp;
 314         off_t offset, end, length, off, len;
 315         struct bio *cbp;
 316         char *addr;
 317         u_int no;
 318
 319         pp = bp->bio_to;
 320         sc = pp->geom->softc;
 321         /*
 322          * If sc == NULL, provider's error should be set and g_ventoy_start()
 323          * should not be called at all.
 324          */
 325         KASSERT(sc != NULL,
 326             ("Provider's error should be set (error=%d)(device=%s).",
 327             bp->bio_to->error, bp->bio_to->name));
 328
 329         G_VENTOY_LOGREQ(bp, "Request received.");
 330
 331         switch (bp->bio_cmd) {
 332         case BIO_READ:
 333         case BIO_WRITE:
 334         case BIO_DELETE:
 335                 break;
 336         case BIO_FLUSH:
 337                 g_ventoy_flush(sc, bp);
 338                 return;
 339         case BIO_GETATTR:
 340                 if (strcmp("GEOM::kerneldump", bp->bio_attribute) == 0) {
 341                         g_ventoy_kernel_dump(bp);
 342                         return;
 343                 }
 344                 /* To which provider it should be delivered? */
 345                 /* FALLTHROUGH */
 346         default:
 347                 g_io_deliver(bp, EOPNOTSUPP);
 348                 return;
 349         }
 350
 351         offset = bp->bio_offset;
 352         length = bp->bio_length;
 353         if ((bp->bio_flags & BIO_UNMAPPED) != 0)
 354                 addr = NULL;
 355         else
 356                 addr = bp->bio_data;
 357         end = offset + length;
 358
 359         bioq_init(&queue);
 360         for (no = 0; no < sc->sc_ndisks; no++) {
 361                 disk = &sc->sc_disks[no];
 362                 if (disk->d_end <= offset)
 363                         continue;
 364                 if (disk->d_start >= end)
 365                         break;
 366
 367                 off = offset - disk->d_start;
 368                 len = MIN(length, disk->d_end - offset);
 369                 length -= len;
 370                 offset += len;
 371
 372                 cbp = g_clone_bio(bp);
 373                 if (cbp == NULL) {
 374                         while ((cbp = bioq_takefirst(&queue)) != NULL)
 375                                 g_destroy_bio(cbp);
 376                         if (bp->bio_error == 0)
 377                                 bp->bio_error = ENOMEM;
 378                         g_io_deliver(bp, bp->bio_error);
 379                         return;
 380                 }
 381                 bioq_insert_tail(&queue, cbp);
 382                 /*
 383                  * Fill in the component buf structure.
 384                  */
 385                 if (len == bp->bio_length)
 386                         cbp->bio_done = g_std_done;
 387                 else
 388                         cbp->bio_done = g_ventoy_done;
 389                 cbp->bio_offset = off + disk->d_map_start;
 390                 cbp->bio_length = len;
 391                 if ((bp->bio_flags & BIO_UNMAPPED) != 0) {
 392                         cbp->bio_ma_offset += (uintptr_t)addr;
 393                         cbp->bio_ma += cbp->bio_ma_offset / PAGE_SIZE;
 394                         cbp->bio_ma_offset %= PAGE_SIZE;
 395                         cbp->bio_ma_n = round_page(cbp->bio_ma_offset +
 396                             cbp->bio_length) / PAGE_SIZE;
 397                 } else
 398                         cbp->bio_data = addr;
 399                 addr += len;
 400                 cbp->bio_to = disk->d_consumer->provider;
 401                 cbp->bio_caller1 = disk;
 402
 403                 if (length == 0)
 404                         break;
 405         }
 406         KASSERT(length == 0,
 407             ("Length is still greater than 0 (class=%s, name=%s).",
 408             bp->bio_to->geom->class->name, bp->bio_to->geom->name));
 409         while ((cbp = bioq_takefirst(&queue)) != NULL) {
 410                 G_VENTOY_LOGREQ(cbp, "Sending request.");
 411                 disk = cbp->bio_caller1;
 412                 cbp->bio_caller1 = NULL;
 413                 g_io_request(cbp, disk->d_consumer);
 414         }
 415 }
 416
 417 static void
 418 g_ventoy_check_and_run(struct g_ventoy_softc *sc)
 419 {
 420         struct g_ventoy_disk *disk;
 421         struct g_provider *dp, *pp;
 422         u_int no, sectorsize = 0;
 423         off_t start;
 424
 425         g_topology_assert();
 426         if (g_ventoy_nvalid(sc) != sc->sc_ndisks)
 427                 return;
 428
 429         pp = g_new_providerf(sc->sc_geom, "ventoy/%s", sc->sc_name);
 430         pp->flags |= G_PF_DIRECT_SEND | G_PF_DIRECT_RECEIVE |
 431             G_PF_ACCEPT_UNMAPPED;
 432         start = 0;
 433         for (no = 0; no < sc->sc_ndisks; no++) {
 434                 disk = &sc->sc_disks[no];
 435                 dp = disk->d_consumer->provider;
 436                 disk->d_start = start;
 437                 disk->d_end = disk->d_start + (disk->d_map_end - disk->d_map_start);
 438                 if (sc->sc_type == G_VENTOY_TYPE_AUTOMATIC)
 439                         disk->d_end -= dp->sectorsize;
 440                 start = disk->d_end;
 441                 if (no == 0)
 442                         sectorsize = dp->sectorsize;
 443                 else
 444                         sectorsize = lcm(sectorsize, dp->sectorsize);
 445
 446                 /* A provider underneath us doesn't support unmapped */
 447                 if ((dp->flags & G_PF_ACCEPT_UNMAPPED) == 0) {
 448                         G_VENTOY_DEBUG(1, "Cancelling unmapped "
 449                             "because of %s.", dp->name);
 450                         pp->flags &= ~G_PF_ACCEPT_UNMAPPED;
 451                 }
 452         }
 453         pp->sectorsize = sectorsize;
 454         /* We have sc->sc_disks[sc->sc_ndisks - 1].d_end in 'start'. */
 455         pp->mediasize = start;
 456         pp->stripesize = sc->sc_disks[0].d_consumer->provider->stripesize;
 457         pp->stripeoffset = sc->sc_disks[0].d_consumer->provider->stripeoffset;
 458         sc->sc_provider = pp;
 459         g_error_provider(pp, 0);
 460
 461         G_VENTOY_DEBUG(0, "Device %s activated.", sc->sc_provider->name);
 462 }
 463
 464 static int
 465 g_ventoy_read_metadata(struct g_consumer *cp, struct g_ventoy_metadata *md)
 466 {
 467         struct g_provider *pp;
 468         u_char *buf;
 469         int error;
 470
 471         g_topology_assert();
 472
 473         error = g_access(cp, 1, 0, 0);
 474         if (error != 0)
 475                 return (error);
 476         pp = cp->provider;
 477         g_topology_unlock();
 478         buf = g_read_data(cp, pp->mediasize - pp->sectorsize, pp->sectorsize,
 479             &error);
 480         g_topology_lock();
 481         g_access(cp, -1, 0, 0);
 482         if (buf == NULL)
 483                 return (error);
 484
 485         /* Decode metadata. */
 486         ventoy_metadata_decode(buf, md);
 487         g_free(buf);
 488
 489         return (0);
 490 }
 491
 492 /*
 493  * Add disk to given device.
 494  */
 495 static int
 496 g_ventoy_add_disk(struct g_ventoy_softc *sc, struct g_provider *pp, u_int no)
 497 {
 498         struct g_ventoy_disk *disk;
 499         struct g_consumer *cp, *fcp;
 500         struct g_geom *gp;
 501         int error;
 502
 503         g_topology_assert();
 504         /* Metadata corrupted? */
 505         if (no >= sc->sc_ndisks)
 506                 return (EINVAL);
 507
 508         disk = &sc->sc_disks[no];
 509         /* Check if disk is not already attached. */
 510         if (disk->d_consumer != NULL)
 511                 return (EEXIST);
 512
 513         gp = sc->sc_geom;
 514         fcp = LIST_FIRST(&gp->consumer);
 515
 516         cp = g_new_consumer(gp);
 517         cp->flags |= G_CF_DIRECT_SEND | G_CF_DIRECT_RECEIVE;
 518         error = g_attach(cp, pp);
 519         if (error != 0) {
 520                 g_destroy_consumer(cp);
 521                 return (error);
 522         }
 523
 524         if (fcp != NULL && (fcp->acr > 0 || fcp->acw > 0 || fcp->ace > 0)) {
 525                 error = g_access(cp, fcp->acr, fcp->acw, fcp->ace);
 526                 if (error != 0) {
 527                         g_detach(cp);
 528                         g_destroy_consumer(cp);
 529                         return (error);
 530                 }
 531         }
 532         if (sc->sc_type == G_VENTOY_TYPE_AUTOMATIC) {
 533                 struct g_ventoy_metadata md;
 534
 535                 /* Re-read metadata. */
 536                 error = g_ventoy_read_metadata(cp, &md);
 537                 if (error != 0)
 538                         goto fail;
 539
 540                 if (strcmp(md.md_magic, G_VENTOY_MAGIC) != 0 ||
 541                     strcmp(md.md_name, sc->sc_name) != 0 ||
 542                     md.md_id != sc->sc_id) {
 543                         G_VENTOY_DEBUG(0, "Metadata on %s changed.", pp->name);
 544                         goto fail;
 545                 }
 546         }
 547
 548         cp->private = disk;
 549         disk->d_consumer = cp;
 550         disk->d_softc = sc;
 551         disk->d_start = 0;      /* not yet */
 552         disk->d_end = 0;        /* not yet */
 553         disk->d_removed = 0;
 554
 555         disk->d_map_start = g_disk_map_start;
 556         disk->d_map_end = g_disk_map_end;
 557
 558         G_VENTOY_DEBUG(0, "Disk %s attached to %s.", pp->name, sc->sc_name);
 559
 560         g_ventoy_check_and_run(sc);
 561
 562         return (0);
 563 fail:
 564         if (fcp != NULL && (fcp->acr > 0 || fcp->acw > 0 || fcp->ace > 0))
 565                 g_access(cp, -fcp->acr, -fcp->acw, -fcp->ace);
 566         g_detach(cp);
 567         g_destroy_consumer(cp);
 568         return (error);
 569 }
 570
 571 static struct g_geom *
 572 g_ventoy_create(struct g_class *mp, const struct g_ventoy_metadata *md,
 573     u_int type)
 574 {
 575         struct g_ventoy_softc *sc;
 576         struct g_geom *gp;
 577         u_int no;
 578
 579         G_VENTOY_DEBUG(1, "Creating device %s (id=%u).", md->md_name,
 580             md->md_id);
 581
 582         /* One disks is minimum. */
 583         if (md->md_all < 1)
 584                 return (NULL);
 585
 586         /* Check for duplicate unit */
 587         LIST_FOREACH(gp, &mp->geom, geom) {
 588                 sc = gp->softc;
 589                 if (sc != NULL && strcmp(sc->sc_name, md->md_name) == 0) {
 590                         G_VENTOY_DEBUG(0, "Device %s already configured.",
 591                             gp->name);
 592                         return (NULL);
 593                 }
 594         }
 595         gp = g_new_geomf(mp, "%s", md->md_name);
 596         sc = malloc(sizeof(*sc), M_VENTOY, M_WAITOK | M_ZERO);
 597         gp->start = g_ventoy_start;
 598         gp->spoiled = g_ventoy_orphan;
 599         gp->orphan = g_ventoy_orphan;
 600         gp->access = g_ventoy_access;
 601         gp->dumpconf = g_ventoy_dumpconf;
 602
 603         sc->sc_id = md->md_id;
 604         sc->sc_ndisks = md->md_all;
 605         sc->sc_disks = malloc(sizeof(struct g_ventoy_disk) * sc->sc_ndisks,
 606             M_VENTOY, M_WAITOK | M_ZERO);
 607         for (no = 0; no < sc->sc_ndisks; no++)
 608                 sc->sc_disks[no].d_consumer = NULL;
 609         sc->sc_type = type;
 610         mtx_init(&sc->sc_lock, "gventoy lock", NULL, MTX_DEF);
 611
 612         gp->softc = sc;
 613         sc->sc_geom = gp;
 614         sc->sc_provider = NULL;
 615
 616         G_VENTOY_DEBUG(0, "Device %s created (id=%u).", sc->sc_name, sc->sc_id);
 617
 618         return (gp);
 619 }
 620
 621 static int
 622 g_ventoy_destroy(struct g_ventoy_softc *sc, boolean_t force)
 623 {
 624         struct g_provider *pp;
 625         struct g_consumer *cp, *cp1;
 626         struct g_geom *gp;
 627
 628         g_topology_assert();
 629
 630         if (sc == NULL)
 631                 return (ENXIO);
 632
 633         pp = sc->sc_provider;
 634         if (pp != NULL && (pp->acr != 0 || pp->acw != 0 || pp->ace != 0)) {
 635                 if (force) {
 636                         G_VENTOY_DEBUG(0, "Device %s is still open, so it "
 637                             "can't be definitely removed.", pp->name);
 638                 } else {
 639                         G_VENTOY_DEBUG(1,
 640                             "Device %s is still open (r%dw%de%d).", pp->name,
 641                             pp->acr, pp->acw, pp->ace);
 642                         return (EBUSY);
 643                 }
 644         }
 645
 646         gp = sc->sc_geom;
 647         LIST_FOREACH_SAFE(cp, &gp->consumer, consumer, cp1) {
 648                 g_ventoy_remove_disk(cp->private);
 649                 if (cp1 == NULL)
 650                         return (0);     /* Recursion happened. */
 651         }
 652         if (!LIST_EMPTY(&gp->consumer))
 653                 return (EINPROGRESS);
 654
 655         gp->softc = NULL;
 656         KASSERT(sc->sc_provider == NULL, ("Provider still exists? (device=%s)",
 657             gp->name));
 658         free(sc->sc_disks, M_VENTOY);
 659         mtx_destroy(&sc->sc_lock);
 660         free(sc, M_VENTOY);
 661
 662         G_VENTOY_DEBUG(0, "Device %s destroyed.", gp->name);
 663         g_wither_geom(gp, ENXIO);
 664         return (0);
 665 }
 666
 667 static int
 668 g_ventoy_destroy_geom(struct gctl_req *req __unused,
 669     struct g_class *mp __unused, struct g_geom *gp)
 670 {
 671         struct g_ventoy_softc *sc;
 672
 673         sc = gp->softc;
 674         return (g_ventoy_destroy(sc, 0));
 675 }
 676
 677 static bool g_vtoy_check_disk(struct g_class *mp, struct g_provider *pp)
 678 {
 679     int i;
 680     uint8_t *buf;
 681     char uuid[64];
 682     const char *value;
 683     struct g_consumer *cp;
 684         struct g_geom *gp;
 685
 686     if (g_ventoy_disk_size == 0)
 687     {
 688         if (resource_string_value("ventoy", 0, "disksize", &value) == 0)
 689         {
 690             G_DEBUG("ventoy.disksize: %s\n", value);
 691             g_ventoy_disk_size = strtouq(value, NULL, 0);
 692         }
 693
 694         if (resource_string_value("ventoy", 0, "diskuuid", &g_ventoy_disk_uuid) == 0)
 695         {
 696             G_DEBUG("ventoy.diskuuid: <%s>\n", g_ventoy_disk_uuid);
 697         }
 698     }
 699
 700     if (g_ventoy_disk_size != pp->mediasize)
 701     {
 702         return false;
 703     }
 704
 705     if (strncmp(pp->name, "cd", 2) == 0 || strchr(pp->name, '/'))
 706     {
 707         return false;
 708     }
 709
 710     /* read UUID from disk */
 711     gp = g_new_geomf(mp, "ventoy:taste");
 712         gp->start = NULL;
 713         gp->access = g_ventoy_access;
 714         gp->orphan = g_ventoy_orphan;
 715         cp = g_new_consumer(gp);
 716         g_attach(cp, pp);
 717
 718     g_access(cp, 1, 0, 0);
 719         g_topology_unlock();
 720         buf = g_read_data(cp, 0, pp->sectorsize, NULL);
 721         g_topology_lock();
 722         g_access(cp, -1, 0, 0);
 723
 724     g_detach(cp);
 725         g_destroy_consumer(cp);
 726         g_destroy_geom(gp);
 727         gp = NULL;
 728
 729     if (!buf)
 730     {
 731         return false;
 732     }
 733
 734     for (i = 0; i < 16; i++)
 735     {
 736         sprintf(uuid + i * 2, "%02x", buf[0x180 + i]);
 737     }
 738     g_free(buf);
 739
 740     if (strncmp(g_ventoy_disk_uuid, uuid, 32) == 0)
 741     {
 742         return true;
 743     }
 744
 745     return false;
 746 }
 747
 748 static struct g_geom *
 749 g_ventoy_taste(struct g_class *mp, struct g_provider *pp, int flags __unused)
 750 {
 751     int i;
 752         int error;
 753     int disknum;
 754     char *endpos;
 755     const char *value;
 756         struct g_geom *gp;
 757         struct g_ventoy_metadata md;
 758         struct g_ventoy_softc *sc;
 759
 760     if (g_ventoy_tasted)
 761     {
 762         return NULL;
 763     }
 764
 765         G_DEBUG("%s(%s, %s)\n", __func__, mp->name, pp->name);
 766         g_topology_assert();
 767
 768         /* Skip providers that are already open for writing. */
 769         if (pp->acw > 0)
 770                 return (NULL);
 771
 772     if (!g_vtoy_check_disk(mp, pp))
 773     {
 774         return NULL;
 775     }
 776
 777     g_ventoy_tasted = true;
 778
 779     G_DEBUG("######### ventoy disk <%s> #############\n", pp->name);
 780
 781     resource_int_value("ventoy", 0, "segnum", &disknum);
 782
 783     strlcpy(md.md_magic, G_VENTOY_MAGIC, sizeof(md.md_magic));
 784         md.md_version = G_VENTOY_VERSION;
 785         strlcpy(md.md_name, "IMAGE", sizeof(md.md_name));
 786         md.md_id = arc4random();
 787         md.md_no = 0;
 788         md.md_all = (uint16_t)disknum;
 789         bzero(md.md_provider, sizeof(md.md_provider));
 790         /* This field is not important here. */
 791         md.md_provsize = 0;
 792
 793         gp = g_ventoy_create(mp, &md, G_VENTOY_TYPE_MANUAL);
 794         if (gp == NULL) {
 795                 G_VENTOY_DEBUG(0, "Cannot create device %s.",
 796                     md.md_name);
 797                 return (NULL);
 798         }
 799         sc = gp->softc;
 800
 801     for (i = 0; i < disknum; i ++)
 802     {
 803         if (resource_string_value("ventoy", i, "seg", &value) == 0)
 804         {
 805             g_disk_map_start = strtouq(value, &endpos, 0);
 806             g_disk_map_end = strtouq(endpos + 1, NULL, 0);
 807         }
 808         else
 809         {
 810             printf("Failed to parse ventoy seg %d\n", i);
 811             continue;
 812         }
 813
 814         G_DEBUG("ventoy segment%d: %s\n", i, value);
 815
 816         G_VENTOY_DEBUG(1, "Adding disk %s to %s.", pp->name, gp->name);
 817         error = g_ventoy_add_disk(sc, pp, i);
 818         if (error != 0) {
 819                 G_VENTOY_DEBUG(0,
 820                     "Cannot add disk %s to %s (error=%d).", pp->name,
 821                     gp->name, error);
 822                 g_ventoy_destroy(sc, 1);
 823                 return (NULL);
 824         }
 825
 826         g_disk_map_start = 0;
 827         g_disk_map_end = 0;
 828     }
 829
 830         return (gp);
 831 }
 832
 833 static void
 834 g_ventoy_ctl_create(struct gctl_req *req, struct g_class *mp)
 835 {
 836         u_int attached, no;
 837         struct g_ventoy_metadata md;
 838         struct g_provider *pp;
 839         struct g_ventoy_softc *sc;
 840         struct g_geom *gp;
 841         struct sbuf *sb;
 842         const char *name;
 843         char param[16];
 844         int *nargs;
 845
 846         g_topology_assert();
 847         nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs));
 848         if (nargs == NULL) {
 849                 gctl_error(req, "No '%s' argument.", "nargs");
 850                 return;
 851         }
 852         if (*nargs < 2) {
 853                 gctl_error(req, "Too few arguments.");
 854                 return;
 855         }
 856
 857         strlcpy(md.md_magic, G_VENTOY_MAGIC, sizeof(md.md_magic));
 858         md.md_version = G_VENTOY_VERSION;
 859         name = gctl_get_asciiparam(req, "arg0");
 860         if (name == NULL) {
 861                 gctl_error(req, "No 'arg%u' argument.", 0);
 862                 return;
 863         }
 864         strlcpy(md.md_name, name, sizeof(md.md_name));
 865         md.md_id = arc4random();
 866         md.md_no = 0;
 867         md.md_all = *nargs - 1;
 868         bzero(md.md_provider, sizeof(md.md_provider));
 869         /* This field is not important here. */
 870         md.md_provsize = 0;
 871
 872         /* Check all providers are valid */
 873         for (no = 1; no < *nargs; no++) {
 874                 snprintf(param, sizeof(param), "arg%u", no);
 875                 name = gctl_get_asciiparam(req, param);
 876                 if (name == NULL) {
 877                         gctl_error(req, "No 'arg%u' argument.", no);
 878                         return;
 879                 }
 880                 if (strncmp(name, "/dev/", strlen("/dev/")) == 0)
 881                         name += strlen("/dev/");
 882                 pp = g_provider_by_name(name);
 883                 if (pp == NULL) {
 884                         G_VENTOY_DEBUG(1, "Disk %s is invalid.", name);
 885                         gctl_error(req, "Disk %s is invalid.", name);
 886                         return;
 887                 }
 888         }
 889
 890         gp = g_ventoy_create(mp, &md, G_VENTOY_TYPE_MANUAL);
 891         if (gp == NULL) {
 892                 gctl_error(req, "Can't configure %s.", md.md_name);
 893                 return;
 894         }
 895
 896         sc = gp->softc;
 897         sb = sbuf_new_auto();
 898         sbuf_printf(sb, "Can't attach disk(s) to %s:", gp->name);
 899         for (attached = 0, no = 1; no < *nargs; no++) {
 900                 snprintf(param, sizeof(param), "arg%u", no);
 901                 name = gctl_get_asciiparam(req, param);
 902                 if (name == NULL) {
 903                         gctl_error(req, "No 'arg%d' argument.", no);
 904                         return;
 905                 }
 906                 if (strncmp(name, "/dev/", strlen("/dev/")) == 0)
 907                         name += strlen("/dev/");
 908                 pp = g_provider_by_name(name);
 909                 KASSERT(pp != NULL, ("Provider %s disappear?!", name));
 910                 if (g_ventoy_add_disk(sc, pp, no - 1) != 0) {
 911                         G_VENTOY_DEBUG(1, "Disk %u (%s) not attached to %s.",
 912                             no, pp->name, gp->name);
 913                         sbuf_printf(sb, " %s", pp->name);
 914                         continue;
 915                 }
 916                 attached++;
 917         }
 918         sbuf_finish(sb);
 919         if (md.md_all != attached) {
 920                 g_ventoy_destroy(gp->softc, 1);
 921                 gctl_error(req, "%s", sbuf_data(sb));
 922         }
 923         sbuf_delete(sb);
 924 }
 925
 926 static struct g_ventoy_softc *
 927 g_ventoy_find_device(struct g_class *mp, const char *name)
 928 {
 929         struct g_ventoy_softc *sc;
 930         struct g_geom *gp;
 931
 932         LIST_FOREACH(gp, &mp->geom, geom) {
 933                 sc = gp->softc;
 934                 if (sc == NULL)
 935                         continue;
 936                 if (strcmp(sc->sc_name, name) == 0)
 937                         return (sc);
 938         }
 939         return (NULL);
 940 }
 941
 942 static void
 943 g_ventoy_ctl_destroy(struct gctl_req *req, struct g_class *mp)
 944 {
 945         struct g_ventoy_softc *sc;
 946         int *force, *nargs, error;
 947         const char *name;
 948         char param[16];
 949         u_int i;
 950
 951         g_topology_assert();
 952
 953         nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs));
 954         if (nargs == NULL) {
 955                 gctl_error(req, "No '%s' argument.", "nargs");
 956                 return;
 957         }
 958         if (*nargs <= 0) {
 959                 gctl_error(req, "Missing device(s).");
 960                 return;
 961         }
 962         force = gctl_get_paraml(req, "force", sizeof(*force));
 963         if (force == NULL) {
 964                 gctl_error(req, "No '%s' argument.", "force");
 965                 return;
 966         }
 967
 968         for (i = 0; i < (u_int)*nargs; i++) {
 969                 snprintf(param, sizeof(param), "arg%u", i);
 970                 name = gctl_get_asciiparam(req, param);
 971                 if (name == NULL) {
 972                         gctl_error(req, "No 'arg%u' argument.", i);
 973                         return;
 974                 }
 975                 sc = g_ventoy_find_device(mp, name);
 976                 if (sc == NULL) {
 977                         gctl_error(req, "No such device: %s.", name);
 978                         return;
 979                 }
 980                 error = g_ventoy_destroy(sc, *force);
 981                 if (error != 0) {
 982                         gctl_error(req, "Cannot destroy device %s (error=%d).",
 983                             sc->sc_name, error);
 984                         return;
 985                 }
 986         }
 987 }
 988
 989 static void
 990 g_ventoy_config(struct gctl_req *req, struct g_class *mp, const char *verb)
 991 {
 992         uint32_t *version;
 993
 994     return;
 995
 996         g_topology_assert();
 997
 998         version = gctl_get_paraml(req, "version", sizeof(*version));
 999         if (version == NULL) {
1000                 gctl_error(req, "No '%s' argument.", "version");
1001                 return;
1002         }
1003         if (*version != G_VENTOY_VERSION) {
1004                 gctl_error(req, "Userland and kernel parts are out of sync.");
1005                 return;
1006         }
1007
1008         if (strcmp(verb, "create") == 0) {
1009                 g_ventoy_ctl_create(req, mp);
1010                 return;
1011         } else if (strcmp(verb, "destroy") == 0 ||
1012             strcmp(verb, "stop") == 0) {
1013                 g_ventoy_ctl_destroy(req, mp);
1014                 return;
1015         }
1016         gctl_error(req, "Unknown verb.");
1017 }
1018
1019 static void
1020 g_ventoy_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp,
1021     struct g_consumer *cp, struct g_provider *pp)
1022 {
1023         struct g_ventoy_softc *sc;
1024
1025         g_topology_assert();
1026         sc = gp->softc;
1027         if (sc == NULL)
1028                 return;
1029         if (pp != NULL) {
1030                 /* Nothing here. */
1031         } else if (cp != NULL) {
1032                 struct g_ventoy_disk *disk;
1033
1034                 disk = cp->private;
1035                 if (disk == NULL)
1036                         return;
1037                 sbuf_printf(sb, "%s<End>%jd</End>\n", indent,
1038                     (intmax_t)disk->d_end);
1039                 sbuf_printf(sb, "%s<Start>%jd</Start>\n", indent,
1040                     (intmax_t)disk->d_start);
1041         } else {
1042                 sbuf_printf(sb, "%s<ID>%u</ID>\n", indent, (u_int)sc->sc_id);
1043                 sbuf_printf(sb, "%s<Type>", indent);
1044                 switch (sc->sc_type) {
1045                 case G_VENTOY_TYPE_AUTOMATIC:
1046                         sbuf_cat(sb, "AUTOMATIC");
1047                         break;
1048                 case G_VENTOY_TYPE_MANUAL:
1049                         sbuf_cat(sb, "MANUAL");
1050                         break;
1051                 default:
1052                         sbuf_cat(sb, "UNKNOWN");
1053                         break;
1054                 }
1055                 sbuf_cat(sb, "</Type>\n");
1056                 sbuf_printf(sb, "%s<Status>Total=%u, Online=%u</Status>\n",
1057                     indent, sc->sc_ndisks, g_ventoy_nvalid(sc));
1058                 sbuf_printf(sb, "%s<State>", indent);
1059                 if (sc->sc_provider != NULL && sc->sc_provider->error == 0)
1060                         sbuf_cat(sb, "UP");
1061                 else
1062                         sbuf_cat(sb, "DOWN");
1063                 sbuf_cat(sb, "</State>\n");
1064         }
1065 }
1066
1067 DECLARE_GEOM_CLASS(g_ventoy_class, g_ventoy);
1068 //MODULE_VERSION(geom_ventoy, 0);