sys/dev/disk/dm/device-mapper.c

   1 /*        $NetBSD: device-mapper.c,v 1.22 2010/03/26 15:46:04 jakllsch Exp $ */
   2
   3 /*
   4  * Copyright (c) 2010 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * This code is derived from software contributed to The NetBSD Foundation
   8  * by Adam Hamsik.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  29  * POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32 /*
  33  * I want to say thank you to all people who helped me with this project.
  34  */
  35
  36 #include <sys/types.h>
  37 #include <sys/param.h>
  38
  39 #include <sys/buf.h>
  40 #include <sys/conf.h>
  41 #include <sys/device.h>
  42 #include <sys/disk.h>
  43 #include <sys/disklabel.h>
  44 #include <sys/dtype.h>
  45 #include <sys/ioccom.h>
  46 #include <sys/malloc.h>
  47 #include <sys/module.h>
  48 #include <sys/sysctl.h>
  49
  50 #include "netbsd-dm.h"
  51 #include "dm.h"
  52
  53 static  d_ioctl_t       dmioctl;
  54 static  d_open_t        dmopen;
  55 static  d_close_t       dmclose;
  56 static  d_psize_t       dmsize;
  57 static  d_strategy_t    dmstrategy;
  58 static  d_dump_t        dmdump;
  59
  60 /* attach and detach routines */
  61 void dmattach(int);
  62 static int dm_modcmd(module_t mod, int cmd, void *unused);
  63 static int dmdestroy(void);
  64
  65 static void dm_doinit(void);
  66
  67 static int dm_cmd_to_fun(prop_dictionary_t);
  68 static int disk_ioctl_switch(cdev_t, u_long, void *);
  69 static int dm_ioctl_switch(u_long);
  70 #if 0
  71 static void dmminphys(struct buf *);
  72 #endif
  73
  74 /* ***Variable-definitions*** */
  75 struct dev_ops dm_ops = {
  76         { "dm", 0, D_DISK | D_MPSAFE },
  77         .d_open         = dmopen,
  78         .d_close        = dmclose,
  79         .d_read         = physread,
  80         .d_write        = physwrite,
  81         .d_ioctl        = dmioctl,
  82         .d_strategy     = dmstrategy,
  83         .d_psize        = dmsize,
  84         .d_dump         = dmdump,
  85 /* D_DISK */
  86 };
  87
  88 MALLOC_DEFINE(M_DM, "dm", "Device Mapper allocations");
  89
  90 int dm_debug_level = 0;
  91
  92 extern uint64_t dm_dev_counter;
  93
  94 static cdev_t dmcdev;
  95
  96 static moduledata_t dm_mod = {
  97     "dm",
  98     dm_modcmd,
  99     NULL
 100 };
 101 DECLARE_MODULE(dm, dm_mod, SI_SUB_RAID, SI_ORDER_ANY);
 102
 103 /*
 104  * This array is used to translate cmd to function pointer.
 105  *
 106  * Interface between libdevmapper and lvm2tools uses different
 107  * names for one IOCTL call because libdevmapper do another thing
 108  * then. When I run "info" or "mknodes" libdevmapper will send same
 109  * ioctl to kernel but will do another things in userspace.
 110  *
 111  */
 112 static struct cmd_function cmd_fn[] = {
 113                 { .cmd = "version", .fn = dm_get_version_ioctl},
 114                 { .cmd = "targets", .fn = dm_list_versions_ioctl},
 115                 { .cmd = "create",  .fn = dm_dev_create_ioctl},
 116                 { .cmd = "info",    .fn = dm_dev_status_ioctl},
 117                 { .cmd = "mknodes", .fn = dm_dev_status_ioctl},
 118                 { .cmd = "names",   .fn = dm_dev_list_ioctl},
 119                 { .cmd = "suspend", .fn = dm_dev_suspend_ioctl},
 120                 { .cmd = "remove",  .fn = dm_dev_remove_ioctl},
 121                 { .cmd = "rename",  .fn = dm_dev_rename_ioctl},
 122                 { .cmd = "resume",  .fn = dm_dev_resume_ioctl},
 123                 { .cmd = "clear",   .fn = dm_table_clear_ioctl},
 124                 { .cmd = "deps",    .fn = dm_table_deps_ioctl},
 125                 { .cmd = "reload",  .fn = dm_table_load_ioctl},
 126                 { .cmd = "status",  .fn = dm_table_status_ioctl},
 127                 { .cmd = "table",   .fn = dm_table_status_ioctl},
 128                 {NULL, NULL}
 129 };
 130
 131 /* New module handle routine */
 132 static int
 133 dm_modcmd(module_t mod, int cmd, void *unused)
 134 {
 135         int error, bmajor, cmajor;
 136
 137         error = 0;
 138         bmajor = -1;
 139         cmajor = -1;
 140
 141         switch (cmd) {
 142         case MOD_LOAD:
 143                 dm_doinit();
 144                 kprintf("Device Mapper version %d.%d.%d loaded\n",
 145                     DM_VERSION_MAJOR, DM_VERSION_MINOR, DM_VERSION_PATCHLEVEL);
 146                 break;
 147
 148         case MOD_UNLOAD:
 149                 /*
 150                  * Disable unloading of dm module if there are any devices
 151                  * defined in driver. This is probably too strong we need
 152                  * to disable auto-unload only if there is mounted dm device
 153                  * present.
 154                  */
 155                 if (dm_dev_counter > 0)
 156                         return EBUSY;
 157
 158                 error = dmdestroy();
 159                 if (error)
 160                         break;
 161                 kprintf("Device Mapper unloaded\n");
 162                 break;
 163
 164         default:
 165                 break;
 166         }
 167
 168         return error;
 169 }
 170
 171 /*
 172  * dm_detach:
 173  *
 174  *      Autoconfiguration detach function for pseudo-device glue.
 175  * This routine is called by dm_ioctl::dm_dev_remove_ioctl and by autoconf to
 176  * remove devices created in device-mapper.
 177  */
 178 int
 179 dm_detach(dm_dev_t *dmv)
 180 {
 181         disable_dev(dmv);
 182
 183         /* Destroy active table first.  */
 184         dm_table_destroy(&dmv->table_head, DM_TABLE_ACTIVE);
 185
 186         /* Destroy inactive table if exits, too. */
 187         dm_table_destroy(&dmv->table_head, DM_TABLE_INACTIVE);
 188
 189         dm_table_head_destroy(&dmv->table_head);
 190
 191         destroy_dev(dmv->devt);
 192
 193         /* Destroy device */
 194         (void)dm_dev_free(dmv);
 195
 196         /* Decrement device counter After removing device */
 197         --dm_dev_counter; /* XXX: was atomic 64 */
 198
 199         return 0;
 200 }
 201
 202 static void
 203 dm_doinit(void)
 204 {
 205         dm_target_init();
 206         dm_dev_init();
 207         dm_pdev_init();
 208         dmcdev = make_dev(&dm_ops, 0, UID_ROOT, GID_OPERATOR, 0640, "mapper/control");
 209 }
 210
 211 /* Destroy routine */
 212 static int
 213 dmdestroy(void)
 214 {
 215         destroy_dev(dmcdev);
 216
 217         dm_dev_destroy();
 218         dm_pdev_destroy();
 219         dm_target_destroy();
 220
 221         return 0;
 222 }
 223
 224 static int
 225 dmopen(struct dev_open_args *ap)
 226 {
 227
 228         aprint_debug("dm open routine called %" PRIu32 "\n",
 229             minor(ap->a_head.a_dev));
 230         return 0;
 231 }
 232
 233 static int
 234 dmclose(struct dev_close_args *ap)
 235 {
 236
 237         aprint_debug("dm close routine called %" PRIu32 "\n",
 238             minor(ap->a_head.a_dev));
 239         return 0;
 240 }
 241
 242
 243 static int
 244 dmioctl(struct dev_ioctl_args *ap)
 245 {
 246         cdev_t dev = ap->a_head.a_dev;
 247         u_long cmd = ap->a_cmd;
 248         void *data = ap->a_data;
 249
 250         int r;
 251         prop_dictionary_t dm_dict_in;
 252
 253         r = 0;
 254
 255         aprint_debug("dmioctl called\n");
 256
 257         KKASSERT(data != NULL);
 258
 259         if (( r = disk_ioctl_switch(dev, cmd, data)) == ENOTTY) {
 260                 struct plistref *pref = (struct plistref *) data;
 261
 262                 /* Check if we were called with NETBSD_DM_IOCTL ioctl
 263                    otherwise quit. */
 264                 if ((r = dm_ioctl_switch(cmd)) != 0)
 265                         return r;
 266
 267                 if((r = prop_dictionary_copyin_ioctl(pref, cmd, &dm_dict_in)) != 0)
 268                         return r;
 269
 270                 if ((r = dm_check_version(dm_dict_in)) != 0)
 271                         goto cleanup_exit;
 272
 273                 /* run ioctl routine */
 274                 if ((r = dm_cmd_to_fun(dm_dict_in)) != 0)
 275                         goto cleanup_exit;
 276
 277 cleanup_exit:
 278                 r = prop_dictionary_copyout_ioctl(pref, cmd, dm_dict_in);
 279                 prop_object_release(dm_dict_in);
 280         }
 281
 282         return r;
 283 }
 284
 285 /*
 286  * Translate command sent from libdevmapper to func.
 287  */
 288 static int
 289 dm_cmd_to_fun(prop_dictionary_t dm_dict){
 290         int i, r;
 291         prop_string_t command;
 292
 293         r = 0;
 294
 295         if ((command = prop_dictionary_get(dm_dict, DM_IOCTL_COMMAND)) == NULL)
 296                 return EINVAL;
 297
 298         for(i = 0; cmd_fn[i].cmd != NULL; i++)
 299                 if (prop_string_equals_cstring(command, cmd_fn[i].cmd))
 300                         break;
 301
 302         if (cmd_fn[i].cmd == NULL)
 303                 return EINVAL;
 304
 305         aprint_debug("ioctl %s called\n", cmd_fn[i].cmd);
 306         r = cmd_fn[i].fn(dm_dict);
 307
 308         return r;
 309 }
 310
 311 /* Call apropriate ioctl handler function. */
 312 static int
 313 dm_ioctl_switch(u_long cmd)
 314 {
 315
 316         switch(cmd) {
 317
 318         case NETBSD_DM_IOCTL:
 319                 aprint_debug("dm NetBSD_DM_IOCTL called\n");
 320                 break;
 321         default:
 322                  aprint_debug("dm unknown ioctl called\n");
 323                  return ENOTTY;
 324                  break; /* NOT REACHED */
 325         }
 326
 327          return 0;
 328 }
 329
 330  /*
 331   * Check for disk specific ioctls.
 332   */
 333
 334 static int
 335 disk_ioctl_switch(cdev_t dev, u_long cmd, void *data)
 336 {
 337         dm_dev_t *dmv;
 338
 339         /* disk ioctls make sense only on block devices */
 340         if (minor(dev) == 0)
 341                 return ENOTTY;
 342
 343         switch(cmd) {
 344         case DIOCGPART:
 345         {
 346                 struct partinfo *dpart;
 347                 u_int64_t size;
 348                 dpart = (void *)data;
 349                 bzero(dpart, sizeof(*dpart));
 350
 351                 if ((dmv = dm_dev_lookup(NULL, NULL, minor(dev))) == NULL)
 352                         return ENODEV;
 353                 if (dmv->diskp->d_info.d_media_blksize == 0) {
 354                         dm_dev_unbusy(dmv);
 355                         return ENOTSUP;
 356                 } else {
 357                         size = dm_table_size(&dmv->table_head);
 358                         dpart->media_offset  = 0;
 359                         dpart->media_size    = size * DEV_BSIZE;
 360                         dpart->media_blocks  = size;
 361                         dpart->media_blksize = DEV_BSIZE;
 362                         dpart->fstype = FS_BSDFFS;
 363                 }
 364                 dm_dev_unbusy(dmv);
 365                 break;
 366         }
 367
 368         default:
 369                 aprint_debug("unknown disk_ioctl called\n");
 370                 return ENOTTY;
 371                 break; /* NOT REACHED */
 372         }
 373
 374         return 0;
 375 }
 376
 377 /*
 378  * Do all IO operations on dm logical devices.
 379  */
 380 static int
 381 dmstrategy(struct dev_strategy_args *ap)
 382 {
 383         cdev_t dev = ap->a_head.a_dev;
 384         struct bio *bio = ap->a_bio;
 385         struct buf *bp = bio->bio_buf;
 386         int bypass;
 387
 388         dm_dev_t *dmv;
 389         dm_table_t  *tbl;
 390         dm_table_entry_t *table_en;
 391         struct buf *nestbuf;
 392
 393         uint32_t dev_type;
 394
 395         uint64_t buf_start, buf_len, issued_len;
 396         uint64_t table_start, table_end;
 397         uint64_t start, end;
 398
 399         buf_start = bio->bio_offset;
 400         buf_len = bp->b_bcount;
 401
 402         tbl = NULL;
 403
 404         table_end = 0;
 405         dev_type = 0;
 406         issued_len = 0;
 407
 408         if ((dmv = dm_dev_lookup(NULL, NULL, minor(dev))) == NULL) {
 409                 bp->b_error = EIO;
 410                 bp->b_resid = bp->b_bcount;
 411                 biodone(bio);
 412                 return 0;
 413         }
 414
 415         switch(bp->b_cmd) {
 416         case BUF_CMD_READ:
 417         case BUF_CMD_WRITE:
 418         case BUF_CMD_FREEBLKS:
 419                 bypass = 0;
 420                 break;
 421         case BUF_CMD_FLUSH:
 422                 bypass = 1;
 423                 KKASSERT(buf_len == 0);
 424                 break;
 425         default:
 426                 dm_dev_unbusy(dmv);
 427                 bp->b_error = EIO;
 428                 bp->b_resid = bp->b_bcount;
 429                 biodone(bio);
 430                 return 0;
 431         }
 432
 433         if (bypass == 0 &&
 434             bounds_check_with_mediasize(bio, DEV_BSIZE,
 435                                         dm_table_size(&dmv->table_head)) <= 0) {
 436                 dm_dev_unbusy(dmv);
 437                 bp->b_resid = bp->b_bcount;
 438                 biodone(bio);
 439                 return 0;
 440         }
 441
 442         /* Select active table */
 443         tbl = dm_table_get_entry(&dmv->table_head, DM_TABLE_ACTIVE);
 444
 445         nestiobuf_init(bio);
 446
 447         /*
 448          * Find out what tables I want to select.
 449          */
 450         SLIST_FOREACH(table_en, tbl, next) {
 451                 /*
 452                  * I need need number of bytes not blocks.
 453                  */
 454                 table_start = table_en->start * DEV_BSIZE;
 455                 table_end = table_start + (table_en->length) * DEV_BSIZE;
 456
 457                 /*
 458                  * Calculate the start and end
 459                  */
 460                 start = MAX(table_start, buf_start);
 461                 end = MIN(table_end, buf_start + buf_len);
 462
 463                 aprint_debug("----------------------------------------\n");
 464                 aprint_debug("table_start %010" PRIu64", table_end %010"
 465                     PRIu64 "\n", table_start, table_end);
 466                 aprint_debug("buf_start %010" PRIu64", buf_len %010"
 467                     PRIu64"\n", buf_start, buf_len);
 468                 aprint_debug("start-buf_start %010"PRIu64", end %010"
 469                     PRIu64"\n", start - buf_start, end);
 470                 aprint_debug("start %010" PRIu64" , end %010"
 471                     PRIu64"\n", start, end);
 472                 aprint_debug("\n----------------------------------------\n");
 473
 474                 if (bypass) {
 475                         nestbuf = getpbuf(NULL);
 476                         nestbuf->b_flags |= bio->bio_buf->b_flags & B_HASBOGUS;
 477
 478                         nestiobuf_add(bio, nestbuf, 0, 0);
 479                         nestbuf->b_bio1.bio_offset = 0;
 480                         table_en->target->strategy(table_en, nestbuf);
 481                 } else if (start < end) {
 482                         nestbuf = getpbuf(NULL);
 483                         nestbuf->b_flags |= bio->bio_buf->b_flags & B_HASBOGUS;
 484
 485                         nestiobuf_add(bio, nestbuf,
 486                                       start - buf_start, (end - start));
 487                         issued_len += end - start;
 488
 489                         nestbuf->b_bio1.bio_offset = (start - table_start);
 490                         table_en->target->strategy(table_en, nestbuf);
 491                 }
 492         }
 493
 494         if (issued_len < buf_len)
 495                 nestiobuf_error(bio, EINVAL);
 496         nestiobuf_start(bio);
 497         dm_table_release(&dmv->table_head, DM_TABLE_ACTIVE);
 498         dm_dev_unbusy(dmv);
 499
 500         return 0;
 501 }
 502
 503 static int
 504 dmdump(struct dev_dump_args *ap)
 505 {
 506         cdev_t dev = ap->a_head.a_dev;
 507         dm_dev_t *dmv;
 508         dm_table_t  *tbl;
 509         dm_table_entry_t *table_en;
 510         uint32_t dev_type;
 511         uint64_t buf_start, buf_len, issued_len;
 512         uint64_t table_start, table_end;
 513         uint64_t start, end, data_offset;
 514         off_t offset;
 515         size_t length;
 516         int error = 0;
 517
 518         buf_start = ap->a_offset;
 519         buf_len = ap->a_length;
 520
 521         tbl = NULL;
 522
 523         table_end = 0;
 524         dev_type = 0;
 525         issued_len = 0;
 526
 527         if ((dmv = dm_dev_lookup(NULL, NULL, minor(dev))) == NULL) {
 528                 return EIO;
 529         }
 530
 531         /* Select active table */
 532         tbl = dm_table_get_entry(&dmv->table_head, DM_TABLE_ACTIVE);
 533
 534
 535         /*
 536          * Find out what tables I want to select.
 537          */
 538         SLIST_FOREACH(table_en, tbl, next) {
 539                 /*
 540                  * I need need number of bytes not blocks.
 541                  */
 542                 table_start = table_en->start * DEV_BSIZE;
 543                 table_end = table_start + (table_en->length) * DEV_BSIZE;
 544
 545                 /*
 546                  * Calculate the start and end
 547                  */
 548                 start = MAX(table_start, buf_start);
 549                 end = MIN(table_end, buf_start + buf_len);
 550
 551                 if (ap->a_length == 0) {
 552                         if (table_en->target->dump == NULL) {
 553                                 error = ENXIO;
 554                                 goto out;
 555                         }
 556
 557                         table_en->target->dump(table_en, NULL, 0, 0);
 558                 } else if (start < end) {
 559                         data_offset = start - buf_start;
 560                         offset = start - table_start;
 561                         length = end - start;
 562
 563                         if (table_en->target->dump == NULL) {
 564                                 error = ENXIO;
 565                                 goto out;
 566                         }
 567
 568                         table_en->target->dump(table_en,
 569                             (char *)ap->a_virtual + data_offset,
 570                             length, offset);
 571
 572                         issued_len += end - start;
 573                 }
 574         }
 575
 576         if (issued_len < buf_len)
 577                 error = EINVAL;
 578
 579 out:
 580         dm_table_release(&dmv->table_head, DM_TABLE_ACTIVE);
 581         dm_dev_unbusy(dmv);
 582
 583         return error;
 584 }
 585
 586 static int
 587 dmsize(struct dev_psize_args *ap)
 588 {
 589         cdev_t dev = ap->a_head.a_dev;
 590         dm_dev_t *dmv;
 591         uint64_t size;
 592
 593         size = 0;
 594
 595         if ((dmv = dm_dev_lookup(NULL, NULL, minor(dev))) == NULL)
 596                         return ENOENT;
 597
 598         size = dm_table_size(&dmv->table_head);
 599         dm_dev_unbusy(dmv);
 600
 601         ap->a_result = (int64_t)size;
 602
 603         return 0;
 604 }
 605
 606 #if 0
 607 static void
 608 dmminphys(struct buf *bp)
 609 {
 610
 611         bp->b_bcount = MIN(bp->b_bcount, MAXPHYS);
 612 }
 613 #endif
 614
 615 void
 616 dmsetdiskinfo(struct disk *disk, dm_table_head_t *head)
 617 {
 618         struct disk_info info;
 619         int dmp_size;
 620
 621         dmp_size = dm_table_size(head);
 622
 623         bzero(&info, sizeof(struct disk_info));
 624         info.d_media_blksize = DEV_BSIZE;
 625         info.d_media_blocks = dmp_size;
 626         info.d_media_size = dmp_size * DEV_BSIZE;
 627         info.d_dsflags = DSO_MBRQUIET; /* XXX */
 628         info.d_secpertrack = 32;
 629         info.d_nheads = 64;
 630         info.d_secpercyl = info.d_secpertrack * info.d_nheads;
 631         info.d_ncylinders = dmp_size / 2048;
 632         bcopy(&info, &disk->d_info, sizeof(disk->d_info));
 633 }
 634
 635 prop_dictionary_t
 636 dmgetdiskinfo(struct disk *disk)
 637 {
 638         prop_dictionary_t disk_info, geom;
 639         struct disk_info *pinfo;
 640
 641         pinfo = &disk->d_info;
 642
 643         disk_info = prop_dictionary_create();
 644         geom = prop_dictionary_create();
 645
 646         prop_dictionary_set_cstring_nocopy(disk_info, "type", "ESDI");
 647         prop_dictionary_set_uint64(geom, "sectors-per-unit", pinfo->d_media_blocks);
 648         prop_dictionary_set_uint32(geom, "sector-size",
 649             DEV_BSIZE /* XXX 512? */);
 650         prop_dictionary_set_uint32(geom, "sectors-per-track", 32);
 651         prop_dictionary_set_uint32(geom, "tracks-per-cylinder", 64);
 652         prop_dictionary_set_uint32(geom, "cylinders-per-unit",
 653             pinfo->d_media_blocks / 2048);
 654         prop_dictionary_set(disk_info, "geometry", geom);
 655         prop_object_release(geom);
 656
 657         return disk_info;
 658 }
 659
 660 void
 661 dmgetproperties(struct disk *disk, dm_table_head_t *head)
 662 {
 663 #if 0
 664         prop_dictionary_t disk_info, odisk_info, geom;
 665         int dmp_size;
 666
 667         dmp_size = dm_table_size(head);
 668         disk_info = prop_dictionary_create();
 669         geom = prop_dictionary_create();
 670
 671         prop_dictionary_set_cstring_nocopy(disk_info, "type", "ESDI");
 672         prop_dictionary_set_uint64(geom, "sectors-per-unit", dmp_size);
 673         prop_dictionary_set_uint32(geom, "sector-size",
 674             DEV_BSIZE /* XXX 512? */);
 675         prop_dictionary_set_uint32(geom, "sectors-per-track", 32);
 676         prop_dictionary_set_uint32(geom, "tracks-per-cylinder", 64);
 677         prop_dictionary_set_uint32(geom, "cylinders-per-unit", dmp_size / 2048);
 678         prop_dictionary_set(disk_info, "geometry", geom);
 679         prop_object_release(geom);
 680
 681         odisk_info = disk->dk_info;
 682         disk->dk_info = disk_info;
 683
 684         if (odisk_info != NULL)
 685                 prop_object_release(odisk_info);
 686 #endif
 687 }
 688
 689 TUNABLE_INT("debug.dm_debug", &dm_debug_level);
 690 SYSCTL_INT(_debug, OID_AUTO, dm_debug, CTLFLAG_RW, &dm_debug_level,
 691                0, "Eanble device mapper debugging");
 692