zfs/zcmd/zpool/zpool_vdev.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21
  22 /*
  23  * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 #pragma ident   "@(#)zpool_vdev.c       1.15    07/11/09 SMI"
  28
  29 /*
  30  * Functions to convert between a list of vdevs and an nvlist representing the
  31  * configuration.  Each entry in the list can be one of:
  32  *
  33  *      Device vdevs
  34  *              disk=(path=..., devid=...)
  35  *              file=(path=...)
  36  *
  37  *      Group vdevs
  38  *              raidz[1|2]=(...)
  39  *              mirror=(...)
  40  *
  41  *      Hot spares
  42  *
  43  * While the underlying implementation supports it, group vdevs cannot contain
  44  * other group vdevs.  All userland verification of devices is contained within
  45  * this file.  If successful, the nvlist returned can be passed directly to the
  46  * kernel; we've done as much verification as possible in userland.
  47  *
  48  * Hot spares are a special case, and passed down as an array of disk vdevs, at
  49  * the same level as the root of the vdev tree.
  50  *
  51  * The only function exported by this file is 'make_root_vdev'.  The
  52  * function performs several passes:
  53  *
  54  *      1. Construct the vdev specification.  Performs syntax validation and
  55  *         makes sure each device is valid.
  56  *      2. Check for devices in use.  Using libdiskmgt, makes sure that no
  57  *         devices are also in use.  Some can be overridden using the 'force'
  58  *         flag, others cannot.
  59  *      3. Check for replication errors if the 'force' flag is not specified.
  60  *         validates that the replication level is consistent across the
  61  *         entire pool.
  62  *      4. Call libzfs to label any whole disks with an EFI label.
  63  */
  64
  65 #include <assert.h>
  66 #include <devid.h>
  67 #include <errno.h>
  68 #include <fcntl.h>
  69 #include <libdiskmgt.h>
  70 #include <libintl.h>
  71 #include <libnvpair.h>
  72 #include <stdio.h>
  73 #include <string.h>
  74 #include <unistd.h>
  75 #include <sys/efi_partition.h>
  76 #include <sys/stat.h>
  77 #include <sys/vtoc.h>
  78 #include <sys/mntent.h>
  79
  80 #include "zpool_util.h"
  81
  82 #define DISK_ROOT       "/dev/dsk"
  83 #define RDISK_ROOT      "/dev/rdsk"
  84 #define BACKUP_SLICE    "s2"
  85
  86 /*
  87  * For any given vdev specification, we can have multiple errors.  The
  88  * vdev_error() function keeps track of whether we have seen an error yet, and
  89  * prints out a header if its the first error we've seen.
  90  */
  91 boolean_t error_seen;
  92 boolean_t is_force;
  93
  94 /*PRINTFLIKE1*/
  95 static void
  96 vdev_error(const char *fmt, ...)
  97 {
  98         va_list ap;
  99
 100         if (!error_seen) {
 101                 (void) fprintf(stderr, gettext("invalid vdev specification\n"));
 102                 if (!is_force)
 103                         (void) fprintf(stderr, gettext("use '-f' to override "
 104                             "the following errors:\n"));
 105                 else
 106                         (void) fprintf(stderr, gettext("the following errors "
 107                             "must be manually repaired:\n"));
 108                 error_seen = B_TRUE;
 109         }
 110
 111         va_start(ap, fmt);
 112         (void) vfprintf(stderr, fmt, ap);
 113         va_end(ap);
 114 }
 115
 116 static void
 117 libdiskmgt_error(int error)
 118 {
 119         /*
 120          * ENXIO/ENODEV is a valid error message if the device doesn't live in
 121          * /dev/dsk.  Don't bother printing an error message in this case.
 122          */
 123         if (error == ENXIO || error == ENODEV)
 124                 return;
 125
 126         (void) fprintf(stderr, gettext("warning: device in use checking "
 127             "failed: %s\n"), strerror(error));
 128 }
 129
 130 /*
 131  * Validate a device, passing the bulk of the work off to libdiskmgt.
 132  */
 133 static int
 134 check_slice(const char *path, int force, boolean_t wholedisk, boolean_t isspare)
 135 {
 136         char *msg;
 137         int error = 0;
 138         dm_who_type_t who;
 139
 140         if (force)
 141                 who = DM_WHO_ZPOOL_FORCE;
 142         else if (isspare)
 143                 who = DM_WHO_ZPOOL_SPARE;
 144         else
 145                 who = DM_WHO_ZPOOL;
 146
 147         if (dm_inuse((char *)path, &msg, who, &error) || error) {
 148                 if (error != 0) {
 149                         libdiskmgt_error(error);
 150                         return (0);
 151                 } else {
 152                         vdev_error("%s", msg);
 153                         free(msg);
 154                         return (-1);
 155                 }
 156         }
 157
 158         /*
 159          * If we're given a whole disk, ignore overlapping slices since we're
 160          * about to label it anyway.
 161          */
 162         error = 0;
 163         if (!wholedisk && !force &&
 164             (dm_isoverlapping((char *)path, &msg, &error) || error)) {
 165                 if (error == 0) {
 166                         /* dm_isoverlapping returned -1 */
 167                         vdev_error(gettext("%s overlaps with %s\n"), path, msg);
 168                         free(msg);
 169                         return (-1);
 170                 } else if (error != ENODEV) {
 171                         /* libdiskmgt's devcache only handles physical drives */
 172                         libdiskmgt_error(error);
 173                         return (0);
 174                 }
 175         }
 176
 177         return (0);
 178 }
 179
 180
 181 /*
 182  * Validate a whole disk.  Iterate over all slices on the disk and make sure
 183  * that none is in use by calling check_slice().
 184  */
 185 static int
 186 check_disk(const char *name, dm_descriptor_t disk, int force, int isspare)
 187 {
 188         dm_descriptor_t *drive, *media, *slice;
 189         int err = 0;
 190         int i;
 191         int ret;
 192
 193         /*
 194          * Get the drive associated with this disk.  This should never fail,
 195          * because we already have an alias handle open for the device.
 196          */
 197         if ((drive = dm_get_associated_descriptors(disk, DM_DRIVE,
 198             &err)) == NULL || *drive == NULL) {
 199                 if (err)
 200                         libdiskmgt_error(err);
 201                 return (0);
 202         }
 203
 204         if ((media = dm_get_associated_descriptors(*drive, DM_MEDIA,
 205             &err)) == NULL) {
 206                 dm_free_descriptors(drive);
 207                 if (err)
 208                         libdiskmgt_error(err);
 209                 return (0);
 210         }
 211
 212         dm_free_descriptors(drive);
 213
 214         /*
 215          * It is possible that the user has specified a removable media drive,
 216          * and the media is not present.
 217          */
 218         if (*media == NULL) {
 219                 dm_free_descriptors(media);
 220                 vdev_error(gettext("'%s' has no media in drive\n"), name);
 221                 return (-1);
 222         }
 223
 224         if ((slice = dm_get_associated_descriptors(*media, DM_SLICE,
 225             &err)) == NULL) {
 226                 dm_free_descriptors(media);
 227                 if (err)
 228                         libdiskmgt_error(err);
 229                 return (0);
 230         }
 231
 232         dm_free_descriptors(media);
 233
 234         ret = 0;
 235
 236         /*
 237          * Iterate over all slices and report any errors.  We don't care about
 238          * overlapping slices because we are using the whole disk.
 239          */
 240         for (i = 0; slice[i] != NULL; i++) {
 241                 char *name = dm_get_name(slice[i], &err);
 242
 243                 if (check_slice(name, force, B_TRUE, isspare) != 0)
 244                         ret = -1;
 245
 246                 dm_free_name(name);
 247         }
 248
 249         dm_free_descriptors(slice);
 250         return (ret);
 251 }
 252
 253 /*
 254  * Validate a device.
 255  */
 256 static int
 257 check_device(const char *path, boolean_t force, boolean_t isspare)
 258 {
 259         dm_descriptor_t desc;
 260         int err;
 261         char *dev;
 262
 263         /*
 264          * For whole disks, libdiskmgt does not include the leading dev path.
 265          */
 266         dev = strrchr(path, '/');
 267         assert(dev != NULL);
 268         dev++;
 269         if ((desc = dm_get_descriptor_by_name(DM_ALIAS, dev, &err)) != NULL) {
 270                 err = check_disk(path, desc, force, isspare);
 271                 dm_free_descriptor(desc);
 272                 return (err);
 273         }
 274
 275         return (check_slice(path, force, B_FALSE, isspare));
 276 }
 277
 278 /*
 279  * Check that a file is valid.  All we can do in this case is check that it's
 280  * not in use by another pool, and not in use by swap.
 281  */
 282 static int
 283 check_file(const char *file, boolean_t force, boolean_t isspare)
 284 {
 285         char  *name;
 286         int fd;
 287         int ret = 0;
 288         int err;
 289         pool_state_t state;
 290         boolean_t inuse;
 291
 292         if (dm_inuse_swap(file, &err)) {
 293                 if (err)
 294                         libdiskmgt_error(err);
 295                 else
 296                         vdev_error(gettext("%s is currently used by swap. "
 297                             "Please see swap(1M).\n"), file);
 298                 return (-1);
 299         }
 300
 301         if ((fd = open(file, O_RDONLY)) < 0)
 302                 return (0);
 303
 304         if (zpool_in_use(g_zfs, fd, &state, &name, &inuse) == 0 && inuse) {
 305                 const char *desc;
 306
 307                 switch (state) {
 308                 case POOL_STATE_ACTIVE:
 309                         desc = gettext("active");
 310                         break;
 311
 312                 case POOL_STATE_EXPORTED:
 313                         desc = gettext("exported");
 314                         break;
 315
 316                 case POOL_STATE_POTENTIALLY_ACTIVE:
 317                         desc = gettext("potentially active");
 318                         break;
 319
 320                 default:
 321                         desc = gettext("unknown");
 322                         break;
 323                 }
 324
 325                 /*
 326                  * Allow hot spares to be shared between pools.
 327                  */
 328                 if (state == POOL_STATE_SPARE && isspare)
 329                         return (0);
 330
 331                 if (state == POOL_STATE_ACTIVE ||
 332                     state == POOL_STATE_SPARE || !force) {
 333                         switch (state) {
 334                         case POOL_STATE_SPARE:
 335                                 vdev_error(gettext("%s is reserved as a hot "
 336                                     "spare for pool %s\n"), file, name);
 337                                 break;
 338                         default:
 339                                 vdev_error(gettext("%s is part of %s pool "
 340                                     "'%s'\n"), file, desc, name);
 341                                 break;
 342                         }
 343                         ret = -1;
 344                 }
 345
 346                 free(name);
 347         }
 348
 349         (void) close(fd);
 350         return (ret);
 351 }
 352
 353
 354 /*
 355  * By "whole disk" we mean an entire physical disk (something we can
 356  * label, toggle the write cache on, etc.) as opposed to the full
 357  * capacity of a pseudo-device such as lofi or did.  We act as if we
 358  * are labeling the disk, which should be a pretty good test of whether
 359  * it's a viable device or not.  Returns B_TRUE if it is and B_FALSE if
 360  * it isn't.
 361  */
 362 static boolean_t
 363 is_whole_disk(const char *arg)
 364 {
 365         struct dk_gpt *label;
 366         int     fd;
 367         char    path[MAXPATHLEN];
 368
 369         (void) snprintf(path, sizeof (path), "%s%s%s",
 370             RDISK_ROOT, strrchr(arg, '/'), BACKUP_SLICE);
 371         if ((fd = open(path, O_RDWR | O_NDELAY)) < 0)
 372                 return (B_FALSE);
 373         if (efi_alloc_and_init(fd, EFI_NUMPAR, &label) != 0) {
 374                 (void) close(fd);
 375                 return (B_FALSE);
 376         }
 377         efi_free(label);
 378         (void) close(fd);
 379         return (B_TRUE);
 380 }
 381
 382 /*
 383  * Create a leaf vdev.  Determine if this is a file or a device.  If it's a
 384  * device, fill in the device id to make a complete nvlist.  Valid forms for a
 385  * leaf vdev are:
 386  *
 387  *      /dev/dsk/xxx    Complete disk path
 388  *      /xxx            Full path to file
 389  *      xxx             Shorthand for /dev/dsk/xxx
 390  */
 391 static nvlist_t *
 392 make_leaf_vdev(const char *arg, uint64_t is_log)
 393 {
 394         char path[MAXPATHLEN];
 395         struct stat64 statbuf;
 396         nvlist_t *vdev = NULL;
 397         char *type = NULL;
 398         boolean_t wholedisk = B_FALSE;
 399
 400         /*
 401          * Determine what type of vdev this is, and put the full path into
 402          * 'path'.  We detect whether this is a device of file afterwards by
 403          * checking the st_mode of the file.
 404          */
 405         if (arg[0] == '/') {
 406                 /*
 407                  * Complete device or file path.  Exact type is determined by
 408                  * examining the file descriptor afterwards.
 409                  */
 410                 wholedisk = is_whole_disk(arg);
 411                 if (!wholedisk && (stat64(arg, &statbuf) != 0)) {
 412                         (void) fprintf(stderr,
 413                             gettext("cannot open '%s': %s\n"),
 414                             arg, strerror(errno));
 415                         return (NULL);
 416                 }
 417
 418                 (void) strlcpy(path, arg, sizeof (path));
 419         } else {
 420                 /*
 421                  * This may be a short path for a device, or it could be total
 422                  * gibberish.  Check to see if it's a known device in
 423                  * /dev/dsk/.  As part of this check, see if we've been given a
 424                  * an entire disk (minus the slice number).
 425                  */
 426                 (void) snprintf(path, sizeof (path), "%s/%s", DISK_ROOT,
 427                     arg);
 428                 wholedisk = is_whole_disk(path);
 429                 if (!wholedisk && (stat64(path, &statbuf) != 0)) {
 430                         /*
 431                          * If we got ENOENT, then the user gave us
 432                          * gibberish, so try to direct them with a
 433                          * reasonable error message.  Otherwise,
 434                          * regurgitate strerror() since it's the best we
 435                          * can do.
 436                          */
 437                         if (errno == ENOENT) {
 438                                 (void) fprintf(stderr,
 439                                     gettext("cannot open '%s': no such "
 440                                     "device in %s\n"), arg, DISK_ROOT);
 441                                 (void) fprintf(stderr,
 442                                     gettext("must be a full path or "
 443                                     "shorthand device name\n"));
 444                                 return (NULL);
 445                         } else {
 446                                 (void) fprintf(stderr,
 447                                     gettext("cannot open '%s': %s\n"),
 448                                     path, strerror(errno));
 449                                 return (NULL);
 450                         }
 451                 }
 452         }
 453
 454         /*
 455          * Determine whether this is a device or a file.
 456          */
 457         if (wholedisk || S_ISBLK(statbuf.st_mode)) {
 458                 type = VDEV_TYPE_DISK;
 459         } else if (S_ISREG(statbuf.st_mode)) {
 460                 type = VDEV_TYPE_FILE;
 461         } else {
 462                 (void) fprintf(stderr, gettext("cannot use '%s': must be a "
 463                     "block device or regular file\n"), path);
 464                 return (NULL);
 465         }
 466
 467         /*
 468          * Finally, we have the complete device or file, and we know that it is
 469          * acceptable to use.  Construct the nvlist to describe this vdev.  All
 470          * vdevs have a 'path' element, and devices also have a 'devid' element.
 471          */
 472         verify(nvlist_alloc(&vdev, NV_UNIQUE_NAME, 0) == 0);
 473         verify(nvlist_add_string(vdev, ZPOOL_CONFIG_PATH, path) == 0);
 474         verify(nvlist_add_string(vdev, ZPOOL_CONFIG_TYPE, type) == 0);
 475         verify(nvlist_add_uint64(vdev, ZPOOL_CONFIG_IS_LOG, is_log) == 0);
 476         if (strcmp(type, VDEV_TYPE_DISK) == 0)
 477                 verify(nvlist_add_uint64(vdev, ZPOOL_CONFIG_WHOLE_DISK,
 478                     (uint64_t)wholedisk) == 0);
 479
 480         /*
 481          * For a whole disk, defer getting its devid until after labeling it.
 482          */
 483         if (S_ISBLK(statbuf.st_mode) && !wholedisk) {
 484                 /*
 485                  * Get the devid for the device.
 486                  */
 487                 int fd;
 488                 ddi_devid_t devid;
 489                 char *minor = NULL, *devid_str = NULL;
 490
 491                 if ((fd = open(path, O_RDONLY)) < 0) {
 492                         (void) fprintf(stderr, gettext("cannot open '%s': "
 493                             "%s\n"), path, strerror(errno));
 494                         nvlist_free(vdev);
 495                         return (NULL);
 496                 }
 497
 498                 if (devid_get(fd, &devid) == 0) {
 499                         if (devid_get_minor_name(fd, &minor) == 0 &&
 500                             (devid_str = devid_str_encode(devid, minor)) !=
 501                             NULL) {
 502                                 verify(nvlist_add_string(vdev,
 503                                     ZPOOL_CONFIG_DEVID, devid_str) == 0);
 504                         }
 505                         if (devid_str != NULL)
 506                                 devid_str_free(devid_str);
 507                         if (minor != NULL)
 508                                 devid_str_free(minor);
 509                         devid_free(devid);
 510                 }
 511
 512                 (void) close(fd);
 513         }
 514
 515         return (vdev);
 516 }
 517
 518 /*
 519  * Go through and verify the replication level of the pool is consistent.
 520  * Performs the following checks:
 521  *
 522  *      For the new spec, verifies that devices in mirrors and raidz are the
 523  *      same size.
 524  *
 525  *      If the current configuration already has inconsistent replication
 526  *      levels, ignore any other potential problems in the new spec.
 527  *
 528  *      Otherwise, make sure that the current spec (if there is one) and the new
 529  *      spec have consistent replication levels.
 530  */
 531 typedef struct replication_level {
 532         char *zprl_type;
 533         uint64_t zprl_children;
 534         uint64_t zprl_parity;
 535 } replication_level_t;
 536
 537 #define ZPOOL_FUZZ      (16 * 1024 * 1024)
 538
 539 /*
 540  * Given a list of toplevel vdevs, return the current replication level.  If
 541  * the config is inconsistent, then NULL is returned.  If 'fatal' is set, then
 542  * an error message will be displayed for each self-inconsistent vdev.
 543  */
 544 static replication_level_t *
 545 get_replication(nvlist_t *nvroot, boolean_t fatal)
 546 {
 547         nvlist_t **top;
 548         uint_t t, toplevels;
 549         nvlist_t **child;
 550         uint_t c, children;
 551         nvlist_t *nv;
 552         char *type;
 553         replication_level_t lastrep, rep, *ret;
 554         boolean_t dontreport;
 555
 556         ret = safe_malloc(sizeof (replication_level_t));
 557
 558         verify(nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_CHILDREN,
 559             &top, &toplevels) == 0);
 560
 561         lastrep.zprl_type = NULL;
 562         for (t = 0; t < toplevels; t++) {
 563                 uint64_t is_log = B_FALSE;
 564
 565                 nv = top[t];
 566
 567                 /*
 568                  * For separate logs we ignore the top level vdev replication
 569                  * constraints.
 570                  */
 571                 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_IS_LOG, &is_log);
 572                 if (is_log)
 573                         continue;
 574
 575                 verify(nvlist_lookup_string(nv, ZPOOL_CONFIG_TYPE,
 576                     &type) == 0);
 577                 if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_CHILDREN,
 578                     &child, &children) != 0) {
 579                         /*
 580                          * This is a 'file' or 'disk' vdev.
 581                          */
 582                         rep.zprl_type = type;
 583                         rep.zprl_children = 1;
 584                         rep.zprl_parity = 0;
 585                 } else {
 586                         uint64_t vdev_size;
 587
 588                         /*
 589                          * This is a mirror or RAID-Z vdev.  Go through and make
 590                          * sure the contents are all the same (files vs. disks),
 591                          * keeping track of the number of elements in the
 592                          * process.
 593                          *
 594                          * We also check that the size of each vdev (if it can
 595                          * be determined) is the same.
 596                          */
 597                         rep.zprl_type = type;
 598                         rep.zprl_children = 0;
 599
 600                         if (strcmp(type, VDEV_TYPE_RAIDZ) == 0) {
 601                                 verify(nvlist_lookup_uint64(nv,
 602                                     ZPOOL_CONFIG_NPARITY,
 603                                     &rep.zprl_parity) == 0);
 604                                 assert(rep.zprl_parity != 0);
 605                         } else {
 606                                 rep.zprl_parity = 0;
 607                         }
 608
 609                         /*
 610                          * The 'dontreport' variable indicates that we've
 611                          * already reported an error for this spec, so don't
 612                          * bother doing it again.
 613                          */
 614                         type = NULL;
 615                         dontreport = 0;
 616                         vdev_size = -1ULL;
 617                         for (c = 0; c < children; c++) {
 618                                 nvlist_t *cnv = child[c];
 619                                 char *path;
 620                                 struct stat64 statbuf;
 621                                 uint64_t size = -1ULL;
 622                                 char *childtype;
 623                                 int fd, err;
 624
 625                                 rep.zprl_children++;
 626
 627                                 verify(nvlist_lookup_string(cnv,
 628                                     ZPOOL_CONFIG_TYPE, &childtype) == 0);
 629
 630                                 /*
 631                                  * If this is a replacing or spare vdev, then
 632                                  * get the real first child of the vdev.
 633                                  */
 634                                 if (strcmp(childtype,
 635                                     VDEV_TYPE_REPLACING) == 0 ||
 636                                     strcmp(childtype, VDEV_TYPE_SPARE) == 0) {
 637                                         nvlist_t **rchild;
 638                                         uint_t rchildren;
 639
 640                                         verify(nvlist_lookup_nvlist_array(cnv,
 641                                             ZPOOL_CONFIG_CHILDREN, &rchild,
 642                                             &rchildren) == 0);
 643                                         assert(rchildren == 2);
 644                                         cnv = rchild[0];
 645
 646                                         verify(nvlist_lookup_string(cnv,
 647                                             ZPOOL_CONFIG_TYPE,
 648                                             &childtype) == 0);
 649                                 }
 650
 651                                 verify(nvlist_lookup_string(cnv,
 652                                     ZPOOL_CONFIG_PATH, &path) == 0);
 653
 654                                 /*
 655                                  * If we have a raidz/mirror that combines disks
 656                                  * with files, report it as an error.
 657                                  */
 658                                 if (!dontreport && type != NULL &&
 659                                     strcmp(type, childtype) != 0) {
 660                                         if (ret != NULL)
 661                                                 free(ret);
 662                                         ret = NULL;
 663                                         if (fatal)
 664                                                 vdev_error(gettext(
 665                                                     "mismatched replication "
 666                                                     "level: %s contains both "
 667                                                     "files and devices\n"),
 668                                                     rep.zprl_type);
 669                                         else
 670                                                 return (NULL);
 671                                         dontreport = B_TRUE;
 672                                 }
 673
 674                                 /*
 675                                  * According to stat(2), the value of 'st_size'
 676                                  * is undefined for block devices and character
 677                                  * devices.  But there is no effective way to
 678                                  * determine the real size in userland.
 679                                  *
 680                                  * Instead, we'll take advantage of an
 681                                  * implementation detail of spec_size().  If the
 682                                  * device is currently open, then we (should)
 683                                  * return a valid size.
 684                                  *
 685                                  * If we still don't get a valid size (indicated
 686                                  * by a size of 0 or MAXOFFSET_T), then ignore
 687                                  * this device altogether.
 688                                  */
 689                                 if ((fd = open(path, O_RDONLY)) >= 0) {
 690                                         err = fstat64(fd, &statbuf);
 691                                         (void) close(fd);
 692                                 } else {
 693                                         err = stat64(path, &statbuf);
 694                                 }
 695
 696                                 if (err != 0 ||
 697                                     statbuf.st_size == 0 ||
 698                                     statbuf.st_size == MAXOFFSET_T)
 699                                         continue;
 700
 701                                 size = statbuf.st_size;
 702
 703                                 /*
 704                                  * Also make sure that devices and
 705                                  * slices have a consistent size.  If
 706                                  * they differ by a significant amount
 707                                  * (~16MB) then report an error.
 708                                  */
 709                                 if (!dontreport &&
 710                                     (vdev_size != -1ULL &&
 711                                     (labs(size - vdev_size) >
 712                                     ZPOOL_FUZZ))) {
 713                                         if (ret != NULL)
 714                                                 free(ret);
 715                                         ret = NULL;
 716                                         if (fatal)
 717                                                 vdev_error(gettext(
 718                                                     "%s contains devices of "
 719                                                     "different sizes\n"),
 720                                                     rep.zprl_type);
 721                                         else
 722                                                 return (NULL);
 723                                         dontreport = B_TRUE;
 724                                 }
 725
 726                                 type = childtype;
 727                                 vdev_size = size;
 728                         }
 729                 }
 730
 731                 /*
 732                  * At this point, we have the replication of the last toplevel
 733                  * vdev in 'rep'.  Compare it to 'lastrep' to see if its
 734                  * different.
 735                  */
 736                 if (lastrep.zprl_type != NULL) {
 737                         if (strcmp(lastrep.zprl_type, rep.zprl_type) != 0) {
 738                                 if (ret != NULL)
 739                                         free(ret);
 740                                 ret = NULL;
 741                                 if (fatal)
 742                                         vdev_error(gettext(
 743                                             "mismatched replication level: "
 744                                             "both %s and %s vdevs are "
 745                                             "present\n"),
 746                                             lastrep.zprl_type, rep.zprl_type);
 747                                 else
 748                                         return (NULL);
 749                         } else if (lastrep.zprl_parity != rep.zprl_parity) {
 750                                 if (ret)
 751                                         free(ret);
 752                                 ret = NULL;
 753                                 if (fatal)
 754                                         vdev_error(gettext(
 755                                             "mismatched replication level: "
 756                                             "both %llu and %llu device parity "
 757                                             "%s vdevs are present\n"),
 758                                             lastrep.zprl_parity,
 759                                             rep.zprl_parity,
 760                                             rep.zprl_type);
 761                                 else
 762                                         return (NULL);
 763                         } else if (lastrep.zprl_children != rep.zprl_children) {
 764                                 if (ret)
 765                                         free(ret);
 766                                 ret = NULL;
 767                                 if (fatal)
 768                                         vdev_error(gettext(
 769                                             "mismatched replication level: "
 770                                             "both %llu-way and %llu-way %s "
 771                                             "vdevs are present\n"),
 772                                             lastrep.zprl_children,
 773                                             rep.zprl_children,
 774                                             rep.zprl_type);
 775                                 else
 776                                         return (NULL);
 777                         }
 778                 }
 779                 lastrep = rep;
 780         }
 781
 782         if (ret != NULL)
 783                 *ret = rep;
 784
 785         return (ret);
 786 }
 787
 788 /*
 789  * Check the replication level of the vdev spec against the current pool.  Calls
 790  * get_replication() to make sure the new spec is self-consistent.  If the pool
 791  * has a consistent replication level, then we ignore any errors.  Otherwise,
 792  * report any difference between the two.
 793  */
 794 static int
 795 check_replication(nvlist_t *config, nvlist_t *newroot)
 796 {
 797         nvlist_t **child;
 798         uint_t  children;
 799         replication_level_t *current = NULL, *new;
 800         int ret;
 801
 802         /*
 803          * If we have a current pool configuration, check to see if it's
 804          * self-consistent.  If not, simply return success.
 805          */
 806         if (config != NULL) {
 807                 nvlist_t *nvroot;
 808
 809                 verify(nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE,
 810                     &nvroot) == 0);
 811                 if ((current = get_replication(nvroot, B_FALSE)) == NULL)
 812                         return (0);
 813         }
 814         /*
 815          * for spares there may be no children, and therefore no
 816          * replication level to check
 817          */
 818         if ((nvlist_lookup_nvlist_array(newroot, ZPOOL_CONFIG_CHILDREN,
 819             &child, &children) != 0) || (children == 0)) {
 820                 free(current);
 821                 return (0);
 822         }
 823
 824         /*
 825          * If all we have is logs then there's no replication level to check.
 826          */
 827         if (num_logs(newroot) == children) {
 828                 free(current);
 829                 return (0);
 830         }
 831
 832         /*
 833          * Get the replication level of the new vdev spec, reporting any
 834          * inconsistencies found.
 835          */
 836         if ((new = get_replication(newroot, B_TRUE)) == NULL) {
 837                 free(current);
 838                 return (-1);
 839         }
 840
 841         /*
 842          * Check to see if the new vdev spec matches the replication level of
 843          * the current pool.
 844          */
 845         ret = 0;
 846         if (current != NULL) {
 847                 if (strcmp(current->zprl_type, new->zprl_type) != 0) {
 848                         vdev_error(gettext(
 849                             "mismatched replication level: pool uses %s "
 850                             "and new vdev is %s\n"),
 851                             current->zprl_type, new->zprl_type);
 852                         ret = -1;
 853                 } else if (current->zprl_parity != new->zprl_parity) {
 854                         vdev_error(gettext(
 855                             "mismatched replication level: pool uses %llu "
 856                             "device parity and new vdev uses %llu\n"),
 857                             current->zprl_parity, new->zprl_parity);
 858                         ret = -1;
 859                 } else if (current->zprl_children != new->zprl_children) {
 860                         vdev_error(gettext(
 861                             "mismatched replication level: pool uses %llu-way "
 862                             "%s and new vdev uses %llu-way %s\n"),
 863                             current->zprl_children, current->zprl_type,
 864                             new->zprl_children, new->zprl_type);
 865                         ret = -1;
 866                 }
 867         }
 868
 869         free(new);
 870         if (current != NULL)
 871                 free(current);
 872
 873         return (ret);
 874 }
 875
 876 /*
 877  * Go through and find any whole disks in the vdev specification, labelling them
 878  * as appropriate.  When constructing the vdev spec, we were unable to open this
 879  * device in order to provide a devid.  Now that we have labelled the disk and
 880  * know that slice 0 is valid, we can construct the devid now.
 881  *
 882  * If the disk was already labeled with an EFI label, we will have gotten the
 883  * devid already (because we were able to open the whole disk).  Otherwise, we
 884  * need to get the devid after we label the disk.
 885  */
 886 static int
 887 make_disks(zpool_handle_t *zhp, nvlist_t *nv)
 888 {
 889         nvlist_t **child;
 890         uint_t c, children;
 891         char *type, *path, *diskname;
 892         char buf[MAXPATHLEN];
 893         uint64_t wholedisk;
 894         int fd;
 895         int ret;
 896         ddi_devid_t devid;
 897         char *minor = NULL, *devid_str = NULL;
 898
 899         verify(nvlist_lookup_string(nv, ZPOOL_CONFIG_TYPE, &type) == 0);
 900
 901         if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_CHILDREN,
 902             &child, &children) != 0) {
 903
 904                 if (strcmp(type, VDEV_TYPE_DISK) != 0)
 905                         return (0);
 906
 907                 /*
 908                  * We have a disk device.  Get the path to the device
 909                  * and see if it's a whole disk by appending the backup
 910                  * slice and stat()ing the device.
 911                  */
 912                 verify(nvlist_lookup_string(nv, ZPOOL_CONFIG_PATH, &path) == 0);
 913                 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_WHOLE_DISK,
 914                     &wholedisk) != 0 || !wholedisk)
 915                         return (0);
 916
 917                 diskname = strrchr(path, '/');
 918                 assert(diskname != NULL);
 919                 diskname++;
 920                 if (zpool_label_disk(g_zfs, zhp, diskname) == -1)
 921                         return (-1);
 922
 923                 /*
 924                  * Fill in the devid, now that we've labeled the disk.
 925                  */
 926                 (void) snprintf(buf, sizeof (buf), "%ss0", path);
 927                 if ((fd = open(buf, O_RDONLY)) < 0) {
 928                         (void) fprintf(stderr,
 929                             gettext("cannot open '%s': %s\n"),
 930                             buf, strerror(errno));
 931                         return (-1);
 932                 }
 933
 934                 if (devid_get(fd, &devid) == 0) {
 935                         if (devid_get_minor_name(fd, &minor) == 0 &&
 936                             (devid_str = devid_str_encode(devid, minor)) !=
 937                             NULL) {
 938                                 verify(nvlist_add_string(nv,
 939                                     ZPOOL_CONFIG_DEVID, devid_str) == 0);
 940                         }
 941                         if (devid_str != NULL)
 942                                 devid_str_free(devid_str);
 943                         if (minor != NULL)
 944                                 devid_str_free(minor);
 945                         devid_free(devid);
 946                 }
 947
 948                 /*
 949                  * Update the path to refer to the 's0' slice.  The presence of
 950                  * the 'whole_disk' field indicates to the CLI that we should
 951                  * chop off the slice number when displaying the device in
 952                  * future output.
 953                  */
 954                 verify(nvlist_add_string(nv, ZPOOL_CONFIG_PATH, buf) == 0);
 955
 956                 (void) close(fd);
 957
 958                 return (0);
 959         }
 960
 961         for (c = 0; c < children; c++)
 962                 if ((ret = make_disks(zhp, child[c])) != 0)
 963                         return (ret);
 964
 965         if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_SPARES,
 966             &child, &children) == 0)
 967                 for (c = 0; c < children; c++)
 968                         if ((ret = make_disks(zhp, child[c])) != 0)
 969                                 return (ret);
 970
 971         if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_L2CACHE,
 972             &child, &children) == 0)
 973                 for (c = 0; c < children; c++)
 974                         if ((ret = make_disks(zhp, child[c])) != 0)
 975                                 return (ret);
 976
 977         return (0);
 978 }
 979
 980 /*
 981  * Determine if the given path is a hot spare within the given configuration.
 982  */
 983 static boolean_t
 984 is_spare(nvlist_t *config, const char *path)
 985 {
 986         int fd;
 987         pool_state_t state;
 988         char *name = NULL;
 989         nvlist_t *label;
 990         uint64_t guid, spareguid;
 991         nvlist_t *nvroot;
 992         nvlist_t **spares;
 993         uint_t i, nspares;
 994         boolean_t inuse;
 995
 996         if ((fd = open(path, O_RDONLY)) < 0)
 997                 return (B_FALSE);
 998
 999         if (zpool_in_use(g_zfs, fd, &state, &name, &inuse) != 0 ||
1000             !inuse ||
1001             state != POOL_STATE_SPARE ||
1002             zpool_read_label(fd, &label) != 0) {
1003                 free(name);
1004                 (void) close(fd);
1005                 return (B_FALSE);
1006         }
1007         free(name);
1008
1009         (void) close(fd);
1010         verify(nvlist_lookup_uint64(label, ZPOOL_CONFIG_GUID, &guid) == 0);
1011         nvlist_free(label);
1012
1013         verify(nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE,
1014             &nvroot) == 0);
1015         if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_SPARES,
1016             &spares, &nspares) == 0) {
1017                 for (i = 0; i < nspares; i++) {
1018                         verify(nvlist_lookup_uint64(spares[i],
1019                             ZPOOL_CONFIG_GUID, &spareguid) == 0);
1020                         if (spareguid == guid)
1021                                 return (B_TRUE);
1022                 }
1023         }
1024
1025         return (B_FALSE);
1026 }
1027
1028 /*
1029  * Go through and find any devices that are in use.  We rely on libdiskmgt for
1030  * the majority of this task.
1031  */
1032 static int
1033 check_in_use(nvlist_t *config, nvlist_t *nv, int force, int isreplacing,
1034     int isspare)
1035 {
1036         nvlist_t **child;
1037         uint_t c, children;
1038         char *type, *path;
1039         int ret;
1040         char buf[MAXPATHLEN];
1041         uint64_t wholedisk;
1042
1043         verify(nvlist_lookup_string(nv, ZPOOL_CONFIG_TYPE, &type) == 0);
1044
1045         if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_CHILDREN,
1046             &child, &children) != 0) {
1047
1048                 verify(nvlist_lookup_string(nv, ZPOOL_CONFIG_PATH, &path) == 0);
1049
1050                 /*
1051                  * As a generic check, we look to see if this is a replace of a
1052                  * hot spare within the same pool.  If so, we allow it
1053                  * regardless of what libdiskmgt or zpool_in_use() says.
1054                  */
1055                 if (isreplacing) {
1056                         if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_WHOLE_DISK,
1057                             &wholedisk) == 0 && wholedisk)
1058                                 (void) snprintf(buf, sizeof (buf), "%ss0",
1059                                     path);
1060                         else
1061                                 (void) strlcpy(buf, path, sizeof (buf));
1062                         if (is_spare(config, buf))
1063                                 return (0);
1064                 }
1065
1066                 if (strcmp(type, VDEV_TYPE_DISK) == 0)
1067                         ret = check_device(path, force, isspare);
1068
1069                 if (strcmp(type, VDEV_TYPE_FILE) == 0)
1070                         ret = check_file(path, force, isspare);
1071
1072                 return (ret);
1073         }
1074
1075         for (c = 0; c < children; c++)
1076                 if ((ret = check_in_use(config, child[c], force,
1077                     isreplacing, B_FALSE)) != 0)
1078                         return (ret);
1079
1080         if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_SPARES,
1081             &child, &children) == 0)
1082                 for (c = 0; c < children; c++)
1083                         if ((ret = check_in_use(config, child[c], force,
1084                             isreplacing, B_TRUE)) != 0)
1085                                 return (ret);
1086
1087         if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_L2CACHE,
1088             &child, &children) == 0)
1089                 for (c = 0; c < children; c++)
1090                         if ((ret = check_in_use(config, child[c], force,
1091                             isreplacing, B_FALSE)) != 0)
1092                                 return (ret);
1093
1094         return (0);
1095 }
1096
1097 static const char *
1098 is_grouping(const char *type, int *mindev)
1099 {
1100         if (strcmp(type, "raidz") == 0 || strcmp(type, "raidz1") == 0) {
1101                 if (mindev != NULL)
1102                         *mindev = 2;
1103                 return (VDEV_TYPE_RAIDZ);
1104         }
1105
1106         if (strcmp(type, "raidz2") == 0) {
1107                 if (mindev != NULL)
1108                         *mindev = 3;
1109                 return (VDEV_TYPE_RAIDZ);
1110         }
1111
1112         if (strcmp(type, "mirror") == 0) {
1113                 if (mindev != NULL)
1114                         *mindev = 2;
1115                 return (VDEV_TYPE_MIRROR);
1116         }
1117
1118         if (strcmp(type, "spare") == 0) {
1119                 if (mindev != NULL)
1120                         *mindev = 1;
1121                 return (VDEV_TYPE_SPARE);
1122         }
1123
1124         if (strcmp(type, "log") == 0) {
1125                 if (mindev != NULL)
1126                         *mindev = 1;
1127                 return (VDEV_TYPE_LOG);
1128         }
1129
1130         if (strcmp(type, "cache") == 0) {
1131                 if (mindev != NULL)
1132                         *mindev = 1;
1133                 return (VDEV_TYPE_L2CACHE);
1134         }
1135
1136         return (NULL);
1137 }
1138
1139 /*
1140  * Construct a syntactically valid vdev specification,
1141  * and ensure that all devices and files exist and can be opened.
1142  * Note: we don't bother freeing anything in the error paths
1143  * because the program is just going to exit anyway.
1144  */
1145 nvlist_t *
1146 construct_spec(int argc, char **argv)
1147 {
1148         nvlist_t *nvroot, *nv, **top, **spares, **l2cache;
1149         int t, toplevels, mindev, nspares, nlogs, nl2cache;
1150         const char *type;
1151         uint64_t is_log;
1152         boolean_t seen_logs;
1153
1154         top = NULL;
1155         toplevels = 0;
1156         spares = NULL;
1157         l2cache = NULL;
1158         nspares = 0;
1159         nlogs = 0;
1160         nl2cache = 0;
1161         is_log = B_FALSE;
1162         seen_logs = B_FALSE;
1163
1164         while (argc > 0) {
1165                 nv = NULL;
1166
1167                 /*
1168                  * If it's a mirror or raidz, the subsequent arguments are
1169                  * its leaves -- until we encounter the next mirror or raidz.
1170                  */
1171                 if ((type = is_grouping(argv[0], &mindev)) != NULL) {
1172                         nvlist_t **child = NULL;
1173                         int c, children = 0;
1174
1175                         if (strcmp(type, VDEV_TYPE_SPARE) == 0) {
1176                                 if (spares != NULL) {
1177                                         (void) fprintf(stderr,
1178                                             gettext("invalid vdev "
1179                                             "specification: 'spare' can be "
1180                                             "specified only once\n"));
1181                                         return (NULL);
1182                                 }
1183                                 is_log = B_FALSE;
1184                         }
1185
1186                         if (strcmp(type, VDEV_TYPE_LOG) == 0) {
1187                                 if (seen_logs) {
1188                                         (void) fprintf(stderr,
1189                                             gettext("invalid vdev "
1190                                             "specification: 'log' can be "
1191                                             "specified only once\n"));
1192                                         return (NULL);
1193                                 }
1194                                 seen_logs = B_TRUE;
1195                                 is_log = B_TRUE;
1196                                 argc--;
1197                                 argv++;
1198                                 /*
1199                                  * A log is not a real grouping device.
1200                                  * We just set is_log and continue.
1201                                  */
1202                                 continue;
1203                         }
1204
1205                         if (strcmp(type, VDEV_TYPE_L2CACHE) == 0) {
1206                                 if (l2cache != NULL) {
1207                                         (void) fprintf(stderr,
1208                                             gettext("invalid vdev "
1209                                             "specification: 'cache' can be "
1210                                             "specified only once\n"));
1211                                         return (NULL);
1212                                 }
1213                                 is_log = B_FALSE;
1214                         }
1215
1216                         if (is_log) {
1217                                 if (strcmp(type, VDEV_TYPE_MIRROR) != 0) {
1218                                         (void) fprintf(stderr,
1219                                             gettext("invalid vdev "
1220                                             "specification: unsupported 'log' "
1221                                             "device: %s\n"), type);
1222                                         return (NULL);
1223                                 }
1224                                 nlogs++;
1225                         }
1226
1227                         for (c = 1; c < argc; c++) {
1228                                 if (is_grouping(argv[c], NULL) != NULL)
1229                                         break;
1230                                 children++;
1231                                 child = realloc(child,
1232                                     children * sizeof (nvlist_t *));
1233                                 if (child == NULL)
1234                                         zpool_no_memory();
1235                                 if ((nv = make_leaf_vdev(argv[c], B_FALSE))
1236                                     == NULL)
1237                                         return (NULL);
1238                                 child[children - 1] = nv;
1239                         }
1240
1241                         if (children < mindev) {
1242                                 (void) fprintf(stderr, gettext("invalid vdev "
1243                                     "specification: %s requires at least %d "
1244                                     "devices\n"), argv[0], mindev);
1245                                 return (NULL);
1246                         }
1247
1248                         argc -= c;
1249                         argv += c;
1250
1251                         if (strcmp(type, VDEV_TYPE_SPARE) == 0) {
1252                                 spares = child;
1253                                 nspares = children;
1254                                 continue;
1255                         } else if (strcmp(type, VDEV_TYPE_L2CACHE) == 0) {
1256                                 l2cache = child;
1257                                 nl2cache = children;
1258                                 continue;
1259                         } else {
1260                                 verify(nvlist_alloc(&nv, NV_UNIQUE_NAME,
1261                                     0) == 0);
1262                                 verify(nvlist_add_string(nv, ZPOOL_CONFIG_TYPE,
1263                                     type) == 0);
1264                                 verify(nvlist_add_uint64(nv,
1265                                     ZPOOL_CONFIG_IS_LOG, is_log) == 0);
1266                                 if (strcmp(type, VDEV_TYPE_RAIDZ) == 0) {
1267                                         verify(nvlist_add_uint64(nv,
1268                                             ZPOOL_CONFIG_NPARITY,
1269                                             mindev - 1) == 0);
1270                                 }
1271                                 verify(nvlist_add_nvlist_array(nv,
1272                                     ZPOOL_CONFIG_CHILDREN, child,
1273                                     children) == 0);
1274
1275                                 for (c = 0; c < children; c++)
1276                                         nvlist_free(child[c]);
1277                                 free(child);
1278                         }
1279                 } else {
1280                         /*
1281                          * We have a device.  Pass off to make_leaf_vdev() to
1282                          * construct the appropriate nvlist describing the vdev.
1283                          */
1284                         if ((nv = make_leaf_vdev(argv[0], is_log)) == NULL)
1285                                 return (NULL);
1286                         if (is_log)
1287                                 nlogs++;
1288                         argc--;
1289                         argv++;
1290                 }
1291
1292                 toplevels++;
1293                 top = realloc(top, toplevels * sizeof (nvlist_t *));
1294                 if (top == NULL)
1295                         zpool_no_memory();
1296                 top[toplevels - 1] = nv;
1297         }
1298
1299         if (toplevels == 0 && nspares == 0 && nl2cache == 0) {
1300                 (void) fprintf(stderr, gettext("invalid vdev "
1301                     "specification: at least one toplevel vdev must be "
1302                     "specified\n"));
1303                 return (NULL);
1304         }
1305
1306         if (seen_logs && nlogs == 0) {
1307                 (void) fprintf(stderr, gettext("invalid vdev specification: "
1308                     "log requires at least 1 device\n"));
1309                 return (NULL);
1310         }
1311
1312         /*
1313          * Finally, create nvroot and add all top-level vdevs to it.
1314          */
1315         verify(nvlist_alloc(&nvroot, NV_UNIQUE_NAME, 0) == 0);
1316         verify(nvlist_add_string(nvroot, ZPOOL_CONFIG_TYPE,
1317             VDEV_TYPE_ROOT) == 0);
1318         verify(nvlist_add_nvlist_array(nvroot, ZPOOL_CONFIG_CHILDREN,
1319             top, toplevels) == 0);
1320         if (nspares != 0)
1321                 verify(nvlist_add_nvlist_array(nvroot, ZPOOL_CONFIG_SPARES,
1322                     spares, nspares) == 0);
1323         if (nl2cache != 0)
1324                 verify(nvlist_add_nvlist_array(nvroot, ZPOOL_CONFIG_L2CACHE,
1325                     l2cache, nl2cache) == 0);
1326
1327         for (t = 0; t < toplevels; t++)
1328                 nvlist_free(top[t]);
1329         for (t = 0; t < nspares; t++)
1330                 nvlist_free(spares[t]);
1331         for (t = 0; t < nl2cache; t++)
1332                 nvlist_free(l2cache[t]);
1333         if (spares)
1334                 free(spares);
1335         if (l2cache)
1336                 free(l2cache);
1337         free(top);
1338
1339         return (nvroot);
1340 }
1341
1342
1343 /*
1344  * Get and validate the contents of the given vdev specification.  This ensures
1345  * that the nvlist returned is well-formed, that all the devices exist, and that
1346  * they are not currently in use by any other known consumer.  The 'poolconfig'
1347  * parameter is the current configuration of the pool when adding devices
1348  * existing pool, and is used to perform additional checks, such as changing the
1349  * replication level of the pool.  It can be 'NULL' to indicate that this is a
1350  * new pool.  The 'force' flag controls whether devices should be forcefully
1351  * added, even if they appear in use.
1352  */
1353 nvlist_t *
1354 make_root_vdev(zpool_handle_t *zhp, int force, int check_rep,
1355     boolean_t isreplacing, int argc, char **argv)
1356 {
1357         nvlist_t *newroot;
1358         nvlist_t *poolconfig = NULL;
1359         is_force = force;
1360
1361         /*
1362          * Construct the vdev specification.  If this is successful, we know
1363          * that we have a valid specification, and that all devices can be
1364          * opened.
1365          */
1366         if ((newroot = construct_spec(argc, argv)) == NULL)
1367                 return (NULL);
1368
1369         if (zhp && ((poolconfig = zpool_get_config(zhp, NULL)) == NULL))
1370                 return (NULL);
1371
1372         /*
1373          * Validate each device to make sure that its not shared with another
1374          * subsystem.  We do this even if 'force' is set, because there are some
1375          * uses (such as a dedicated dump device) that even '-f' cannot
1376          * override.
1377          */
1378         if (check_in_use(poolconfig, newroot, force, isreplacing,
1379             B_FALSE) != 0) {
1380                 nvlist_free(newroot);
1381                 return (NULL);
1382         }
1383
1384         /*
1385          * Check the replication level of the given vdevs and report any errors
1386          * found.  We include the existing pool spec, if any, as we need to
1387          * catch changes against the existing replication level.
1388          */
1389         if (check_rep && check_replication(poolconfig, newroot) != 0) {
1390                 nvlist_free(newroot);
1391                 return (NULL);
1392         }
1393
1394         /*
1395          * Run through the vdev specification and label any whole disks found.
1396          */
1397         if (make_disks(zhp, newroot) != 0) {
1398                 nvlist_free(newroot);
1399                 return (NULL);
1400         }
1401
1402         return (newroot);
1403 }