cmd/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 (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
  24  */
  25
  26 /*
  27  * Functions to convert between a list of vdevs and an nvlist representing the
  28  * configuration.  Each entry in the list can be one of:
  29  *
  30  *      Device vdevs
  31  *              disk=(path=..., devid=...)
  32  *              file=(path=...)
  33  *
  34  *      Group vdevs
  35  *              raidz[1|2]=(...)
  36  *              mirror=(...)
  37  *
  38  *      Hot spares
  39  *
  40  * While the underlying implementation supports it, group vdevs cannot contain
  41  * other group vdevs.  All userland verification of devices is contained within
  42  * this file.  If successful, the nvlist returned can be passed directly to the
  43  * kernel; we've done as much verification as possible in userland.
  44  *
  45  * Hot spares are a special case, and passed down as an array of disk vdevs, at
  46  * the same level as the root of the vdev tree.
  47  *
  48  * The only function exported by this file is 'make_root_vdev'.  The
  49  * function performs several passes:
  50  *
  51  *      1. Construct the vdev specification.  Performs syntax validation and
  52  *         makes sure each device is valid.
  53  *      2. Check for devices in use.  Using libdiskmgt, makes sure that no
  54  *         devices are also in use.  Some can be overridden using the 'force'
  55  *         flag, others cannot.
  56  *      3. Check for replication errors if the 'force' flag is not specified.
  57  *         validates that the replication level is consistent across the
  58  *         entire pool.
  59  *      4. Call libzfs to label any whole disks with an EFI label.
  60  */
  61
  62 #include <assert.h>
  63 #include <devid.h>
  64 #include <errno.h>
  65 #include <fcntl.h>
  66 #include <libdiskmgt.h>
  67 #include <libintl.h>
  68 #include <libnvpair.h>
  69 #include <limits.h>
  70 #include <stdio.h>
  71 #include <string.h>
  72 #include <unistd.h>
  73 #include <sys/efi_partition.h>
  74 #include <sys/stat.h>
  75 #include <sys/vtoc.h>
  76 #include <sys/mntent.h>
  77
  78 #include "zpool_util.h"
  79
  80 #define DISK_ROOT       "/dev/dsk"
  81 #define RDISK_ROOT      "/dev/rdsk"
  82 #define BACKUP_SLICE    "s2"
  83
  84 /*
  85  * For any given vdev specification, we can have multiple errors.  The
  86  * vdev_error() function keeps track of whether we have seen an error yet, and
  87  * prints out a header if its the first error we've seen.
  88  */
  89 boolean_t error_seen;
  90 boolean_t is_force;
  91
  92 /*PRINTFLIKE1*/
  93 static void
  94 vdev_error(const char *fmt, ...)
  95 {
  96         va_list ap;
  97
  98         if (!error_seen) {
  99                 (void) fprintf(stderr, gettext("invalid vdev specification\n"));
 100                 if (!is_force)
 101                         (void) fprintf(stderr, gettext("use '-f' to override "
 102                             "the following errors:\n"));
 103                 else
 104                         (void) fprintf(stderr, gettext("the following errors "
 105                             "must be manually repaired:\n"));
 106                 error_seen = B_TRUE;
 107         }
 108
 109         va_start(ap, fmt);
 110         (void) vfprintf(stderr, fmt, ap);
 111         va_end(ap);
 112 }
 113
 114 static void
 115 libdiskmgt_error(int error)
 116 {
 117         /*
 118          * ENXIO/ENODEV is a valid error message if the device doesn't live in
 119          * /dev/dsk.  Don't bother printing an error message in this case.
 120          */
 121         if (error == ENXIO || error == ENODEV)
 122                 return;
 123
 124         (void) fprintf(stderr, gettext("warning: device in use checking "
 125             "failed: %s\n"), strerror(error));
 126 }
 127
 128 /*
 129  * Validate a device, passing the bulk of the work off to libdiskmgt.
 130  */
 131 static int
 132 check_slice(const char *path, int force, boolean_t wholedisk, boolean_t isspare)
 133 {
 134         char *msg;
 135         int error = 0;
 136         dm_who_type_t who;
 137
 138         if (force)
 139                 who = DM_WHO_ZPOOL_FORCE;
 140         else if (isspare)
 141                 who = DM_WHO_ZPOOL_SPARE;
 142         else
 143                 who = DM_WHO_ZPOOL;
 144
 145         if (dm_inuse((char *)path, &msg, who, &error) || error) {
 146                 if (error != 0) {
 147                         libdiskmgt_error(error);
 148                         return (0);
 149                 } else {
 150                         vdev_error("%s", msg);
 151                         free(msg);
 152                         return (-1);
 153                 }
 154         }
 155
 156         /*
 157          * If we're given a whole disk, ignore overlapping slices since we're
 158          * about to label it anyway.
 159          */
 160         error = 0;
 161         if (!wholedisk && !force &&
 162             (dm_isoverlapping((char *)path, &msg, &error) || error)) {
 163                 if (error == 0) {
 164                         /* dm_isoverlapping returned -1 */
 165                         vdev_error(gettext("%s overlaps with %s\n"), path, msg);
 166                         free(msg);
 167                         return (-1);
 168                 } else if (error != ENODEV) {
 169                         /* libdiskmgt's devcache only handles physical drives */
 170                         libdiskmgt_error(error);
 171                         return (0);
 172                 }
 173         }
 174
 175         return (0);
 176 }
 177
 178
 179 /*
 180  * Validate a whole disk.  Iterate over all slices on the disk and make sure
 181  * that none is in use by calling check_slice().
 182  */
 183 static int
 184 check_disk(const char *name, dm_descriptor_t disk, int force, int isspare)
 185 {
 186         dm_descriptor_t *drive, *media, *slice;
 187         int err = 0;
 188         int i;
 189         int ret;
 190
 191         /*
 192          * Get the drive associated with this disk.  This should never fail,
 193          * because we already have an alias handle open for the device.
 194          */
 195         if ((drive = dm_get_associated_descriptors(disk, DM_DRIVE,
 196             &err)) == NULL || *drive == NULL) {
 197                 if (err)
 198                         libdiskmgt_error(err);
 199                 return (0);
 200         }
 201
 202         if ((media = dm_get_associated_descriptors(*drive, DM_MEDIA,
 203             &err)) == NULL) {
 204                 dm_free_descriptors(drive);
 205                 if (err)
 206                         libdiskmgt_error(err);
 207                 return (0);
 208         }
 209
 210         dm_free_descriptors(drive);
 211
 212         /*
 213          * It is possible that the user has specified a removable media drive,
 214          * and the media is not present.
 215          */
 216         if (*media == NULL) {
 217                 dm_free_descriptors(media);
 218                 vdev_error(gettext("'%s' has no media in drive\n"), name);
 219                 return (-1);
 220         }
 221
 222         if ((slice = dm_get_associated_descriptors(*media, DM_SLICE,
 223             &err)) == NULL) {
 224                 dm_free_descriptors(media);
 225                 if (err)
 226                         libdiskmgt_error(err);
 227                 return (0);
 228         }
 229
 230         dm_free_descriptors(media);
 231
 232         ret = 0;
 233
 234         /*
 235          * Iterate over all slices and report any errors.  We don't care about
 236          * overlapping slices because we are using the whole disk.
 237          */
 238         for (i = 0; slice[i] != NULL; i++) {
 239                 char *name = dm_get_name(slice[i], &err);
 240
 241                 if (check_slice(name, force, B_TRUE, isspare) != 0)
 242                         ret = -1;
 243
 244                 dm_free_name(name);
 245         }
 246
 247         dm_free_descriptors(slice);
 248         return (ret);
 249 }
 250
 251 /*
 252  * Validate a device.
 253  */
 254 static int
 255 check_device(const char *path, boolean_t force, boolean_t isspare)
 256 {
 257         dm_descriptor_t desc;
 258         int err;
 259         char *dev;
 260
 261         /*
 262          * For whole disks, libdiskmgt does not include the leading dev path.
 263          */
 264         dev = strrchr(path, '/');
 265         assert(dev != NULL);
 266         dev++;
 267         if ((desc = dm_get_descriptor_by_name(DM_ALIAS, dev, &err)) != NULL) {
 268                 err = check_disk(path, desc, force, isspare);
 269                 dm_free_descriptor(desc);
 270                 return (err);
 271         }
 272
 273         return (check_slice(path, force, B_FALSE, isspare));
 274 }
 275
 276 /*
 277  * Check that a file is valid.  All we can do in this case is check that it's
 278  * not in use by another pool, and not in use by swap.
 279  */
 280 static int
 281 check_file(const char *file, boolean_t force, boolean_t isspare)
 282 {
 283         char  *name;
 284         int fd;
 285         int ret = 0;
 286         int err;
 287         pool_state_t state;
 288         boolean_t inuse;
 289
 290         if (dm_inuse_swap(file, &err)) {
 291                 if (err)
 292                         libdiskmgt_error(err);
 293                 else
 294                         vdev_error(gettext("%s is currently used by swap. "
 295                             "Please see swap(1M).\n"), file);
 296                 return (-1);
 297         }
 298
 299         if ((fd = open(file, O_RDONLY)) < 0)
 300                 return (0);
 301
 302         if (zpool_in_use(g_zfs, fd, &state, &name, &inuse) == 0 && inuse) {
 303                 const char *desc;
 304
 305                 switch (state) {
 306                 case POOL_STATE_ACTIVE:
 307                         desc = gettext("active");
 308                         break;
 309
 310                 case POOL_STATE_EXPORTED:
 311                         desc = gettext("exported");
 312                         break;
 313
 314                 case POOL_STATE_POTENTIALLY_ACTIVE:
 315                         desc = gettext("potentially active");
 316                         break;
 317
 318                 default:
 319                         desc = gettext("unknown");
 320                         break;
 321                 }
 322
 323                 /*
 324                  * Allow hot spares to be shared between pools.
 325                  */
 326                 if (state == POOL_STATE_SPARE && isspare)
 327                         return (0);
 328
 329                 if (state == POOL_STATE_ACTIVE ||
 330                     state == POOL_STATE_SPARE || !force) {
 331                         switch (state) {
 332                         case POOL_STATE_SPARE:
 333                                 vdev_error(gettext("%s is reserved as a hot "
 334                                     "spare for pool %s\n"), file, name);
 335                                 break;
 336                         default:
 337                                 vdev_error(gettext("%s is part of %s pool "
 338                                     "'%s'\n"), file, desc, name);
 339                                 break;
 340                         }
 341                         ret = -1;
 342                 }
 343
 344                 free(name);
 345         }
 346
 347         (void) close(fd);
 348         return (ret);
 349 }
 350
 351
 352 /*
 353  * By "whole disk" we mean an entire physical disk (something we can
 354  * label, toggle the write cache on, etc.) as opposed to the full
 355  * capacity of a pseudo-device such as lofi or did.  We act as if we
 356  * are labeling the disk, which should be a pretty good test of whether
 357  * it's a viable device or not.  Returns B_TRUE if it is and B_FALSE if
 358  * it isn't.
 359  */
 360 static boolean_t
 361 is_whole_disk(const char *arg)
 362 {
 363         struct dk_gpt *label;
 364         int     fd;
 365         char    path[MAXPATHLEN];
 366
 367         (void) snprintf(path, sizeof (path), "%s%s%s",
 368             RDISK_ROOT, strrchr(arg, '/'), BACKUP_SLICE);
 369         if ((fd = open(path, O_RDWR | O_NDELAY)) < 0)
 370                 return (B_FALSE);
 371         if (efi_alloc_and_init(fd, EFI_NUMPAR, &label) != 0) {
 372                 (void) close(fd);
 373                 return (B_FALSE);
 374         }
 375         efi_free(label);
 376         (void) close(fd);
 377         return (B_TRUE);
 378 }
 379
 380 /*
 381  * Create a leaf vdev.  Determine if this is a file or a device.  If it's a
 382  * device, fill in the device id to make a complete nvlist.  Valid forms for a
 383  * leaf vdev are:
 384  *
 385  *      /dev/dsk/xxx    Complete disk path
 386  *      /xxx            Full path to file
 387  *      xxx             Shorthand for /dev/dsk/xxx
 388  */
 389 static nvlist_t *
 390 make_leaf_vdev(const char *arg, uint64_t is_log)
 391 {
 392         char path[MAXPATHLEN];
 393         struct stat64 statbuf;
 394         nvlist_t *vdev = NULL;
 395         char *type = NULL;
 396         boolean_t wholedisk = B_FALSE;
 397
 398         /*
 399          * Determine what type of vdev this is, and put the full path into
 400          * 'path'.  We detect whether this is a device of file afterwards by
 401          * checking the st_mode of the file.
 402          */
 403         if (arg[0] == '/') {
 404                 /*
 405                  * Complete device or file path.  Exact type is determined by
 406                  * examining the file descriptor afterwards.
 407                  */
 408                 wholedisk = is_whole_disk(arg);
 409                 if (!wholedisk && (stat64(arg, &statbuf) != 0)) {
 410                         (void) fprintf(stderr,
 411                             gettext("cannot open '%s': %s\n"),
 412                             arg, strerror(errno));
 413                         return (NULL);
 414                 }
 415
 416                 (void) strlcpy(path, arg, sizeof (path));
 417         } else {
 418                 /*
 419                  * This may be a short path for a device, or it could be total
 420                  * gibberish.  Check to see if it's a known device in
 421                  * /dev/dsk/.  As part of this check, see if we've been given a
 422                  * an entire disk (minus the slice number).
 423                  */
 424                 (void) snprintf(path, sizeof (path), "%s/%s", DISK_ROOT,
 425                     arg);
 426                 wholedisk = is_whole_disk(path);
 427                 if (!wholedisk && (stat64(path, &statbuf) != 0)) {
 428                         /*
 429                          * If we got ENOENT, then the user gave us
 430                          * gibberish, so try to direct them with a
 431                          * reasonable error message.  Otherwise,
 432                          * regurgitate strerror() since it's the best we
 433                          * can do.
 434                          */
 435                         if (errno == ENOENT) {
 436                                 (void) fprintf(stderr,
 437                                     gettext("cannot open '%s': no such "
 438                                     "device in %s\n"), arg, DISK_ROOT);
 439                                 (void) fprintf(stderr,
 440                                     gettext("must be a full path or "
 441                                     "shorthand device name\n"));
 442                                 return (NULL);
 443                         } else {
 444                                 (void) fprintf(stderr,
 445                                     gettext("cannot open '%s': %s\n"),
 446                                     path, strerror(errno));
 447                                 return (NULL);
 448                         }
 449                 }
 450         }
 451
 452         /*
 453          * Determine whether this is a device or a file.
 454          */
 455         if (wholedisk || S_ISBLK(statbuf.st_mode)) {
 456                 type = VDEV_TYPE_DISK;
 457         } else if (S_ISREG(statbuf.st_mode)) {
 458                 type = VDEV_TYPE_FILE;
 459         } else {
 460                 (void) fprintf(stderr, gettext("cannot use '%s': must be a "
 461                     "block device or regular file\n"), path);
 462                 return (NULL);
 463         }
 464
 465         /*
 466          * Finally, we have the complete device or file, and we know that it is
 467          * acceptable to use.  Construct the nvlist to describe this vdev.  All
 468          * vdevs have a 'path' element, and devices also have a 'devid' element.
 469          */
 470         verify(nvlist_alloc(&vdev, NV_UNIQUE_NAME, 0) == 0);
 471         verify(nvlist_add_string(vdev, ZPOOL_CONFIG_PATH, path) == 0);
 472         verify(nvlist_add_string(vdev, ZPOOL_CONFIG_TYPE, type) == 0);
 473         verify(nvlist_add_uint64(vdev, ZPOOL_CONFIG_IS_LOG, is_log) == 0);
 474         if (strcmp(type, VDEV_TYPE_DISK) == 0)
 475                 verify(nvlist_add_uint64(vdev, ZPOOL_CONFIG_WHOLE_DISK,
 476                     (uint64_t)wholedisk) == 0);
 477
 478         /*
 479          * For a whole disk, defer getting its devid until after labeling it.
 480          */
 481         if (S_ISBLK(statbuf.st_mode) && !wholedisk) {
 482                 /*
 483                  * Get the devid for the device.
 484                  */
 485                 int fd;
 486                 ddi_devid_t devid;
 487                 char *minor = NULL, *devid_str = NULL;
 488
 489                 if ((fd = open(path, O_RDONLY)) < 0) {
 490                         (void) fprintf(stderr, gettext("cannot open '%s': "
 491                             "%s\n"), path, strerror(errno));
 492                         nvlist_free(vdev);
 493                         return (NULL);
 494                 }
 495
 496                 if (devid_get(fd, &devid) == 0) {
 497                         if (devid_get_minor_name(fd, &minor) == 0 &&
 498                             (devid_str = devid_str_encode(devid, minor)) !=
 499                             NULL) {
 500                                 verify(nvlist_add_string(vdev,
 501                                     ZPOOL_CONFIG_DEVID, devid_str) == 0);
 502                         }
 503                         if (devid_str != NULL)
 504                                 devid_str_free(devid_str);
 505                         if (minor != NULL)
 506                                 devid_str_free(minor);
 507                         devid_free(devid);
 508                 }
 509
 510                 (void) close(fd);
 511         }
 512
 513         return (vdev);
 514 }
 515
 516 /*
 517  * Go through and verify the replication level of the pool is consistent.
 518  * Performs the following checks:
 519  *
 520  *      For the new spec, verifies that devices in mirrors and raidz are the
 521  *      same size.
 522  *
 523  *      If the current configuration already has inconsistent replication
 524  *      levels, ignore any other potential problems in the new spec.
 525  *
 526  *      Otherwise, make sure that the current spec (if there is one) and the new
 527  *      spec have consistent replication levels.
 528  */
 529 typedef struct replication_level {
 530         char *zprl_type;
 531         uint64_t zprl_children;
 532         uint64_t zprl_parity;
 533 } replication_level_t;
 534
 535 #define ZPOOL_FUZZ      (16 * 1024 * 1024)
 536
 537 /*
 538  * Given a list of toplevel vdevs, return the current replication level.  If
 539  * the config is inconsistent, then NULL is returned.  If 'fatal' is set, then
 540  * an error message will be displayed for each self-inconsistent vdev.
 541  */
 542 static replication_level_t *
 543 get_replication(nvlist_t *nvroot, boolean_t fatal)
 544 {
 545         nvlist_t **top;
 546         uint_t t, toplevels;
 547         nvlist_t **child;
 548         uint_t c, children;
 549         nvlist_t *nv;
 550         char *type;
 551         replication_level_t lastrep = { 0 }, rep, *ret;
 552         boolean_t dontreport;
 553
 554         ret = safe_malloc(sizeof (replication_level_t));
 555
 556         verify(nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_CHILDREN,
 557             &top, &toplevels) == 0);
 558
 559         lastrep.zprl_type = NULL;
 560         for (t = 0; t < toplevels; t++) {
 561                 uint64_t is_log = B_FALSE;
 562
 563                 nv = top[t];
 564
 565                 /*
 566                  * For separate logs we ignore the top level vdev replication
 567                  * constraints.
 568                  */
 569                 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_IS_LOG, &is_log);
 570                 if (is_log)
 571                         continue;
 572
 573                 verify(nvlist_lookup_string(nv, ZPOOL_CONFIG_TYPE,
 574                     &type) == 0);
 575                 if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_CHILDREN,
 576                     &child, &children) != 0) {
 577                         /*
 578                          * This is a 'file' or 'disk' vdev.
 579                          */
 580                         rep.zprl_type = type;
 581                         rep.zprl_children = 1;
 582                         rep.zprl_parity = 0;
 583                 } else {
 584                         uint64_t vdev_size;
 585
 586                         /*
 587                          * This is a mirror or RAID-Z vdev.  Go through and make
 588                          * sure the contents are all the same (files vs. disks),
 589                          * keeping track of the number of elements in the
 590                          * process.
 591                          *
 592                          * We also check that the size of each vdev (if it can
 593                          * be determined) is the same.
 594                          */
 595                         rep.zprl_type = type;
 596                         rep.zprl_children = 0;
 597
 598                         if (strcmp(type, VDEV_TYPE_RAIDZ) == 0) {
 599                                 verify(nvlist_lookup_uint64(nv,
 600                                     ZPOOL_CONFIG_NPARITY,
 601                                     &rep.zprl_parity) == 0);
 602                                 assert(rep.zprl_parity != 0);
 603                         } else {
 604                                 rep.zprl_parity = 0;
 605                         }
 606
 607                         /*
 608                          * The 'dontreport' variable indicates that we've
 609                          * already reported an error for this spec, so don't
 610                          * bother doing it again.
 611                          */
 612                         type = NULL;
 613                         dontreport = 0;
 614                         vdev_size = -1ULL;
 615                         for (c = 0; c < children; c++) {
 616                                 nvlist_t *cnv = child[c];
 617                                 char *path;
 618                                 struct stat64 statbuf;
 619                                 uint64_t size = -1ULL;
 620                                 char *childtype;
 621                                 int fd, err;
 622
 623                                 rep.zprl_children++;
 624
 625                                 verify(nvlist_lookup_string(cnv,
 626                                     ZPOOL_CONFIG_TYPE, &childtype) == 0);
 627
 628                                 /*
 629                                  * If this is a replacing or spare vdev, then
 630                                  * get the real first child of the vdev.
 631                                  */
 632                                 if (strcmp(childtype,
 633                                     VDEV_TYPE_REPLACING) == 0 ||
 634                                     strcmp(childtype, VDEV_TYPE_SPARE) == 0) {
 635                                         nvlist_t **rchild;
 636                                         uint_t rchildren;
 637
 638                                         verify(nvlist_lookup_nvlist_array(cnv,
 639                                             ZPOOL_CONFIG_CHILDREN, &rchild,
 640                                             &rchildren) == 0);
 641                                         assert(rchildren == 2);
 642                                         cnv = rchild[0];
 643
 644                                         verify(nvlist_lookup_string(cnv,
 645                                             ZPOOL_CONFIG_TYPE,
 646                                             &childtype) == 0);
 647                                 }
 648
 649                                 verify(nvlist_lookup_string(cnv,
 650                                     ZPOOL_CONFIG_PATH, &path) == 0);
 651
 652                                 /*
 653                                  * If we have a raidz/mirror that combines disks
 654                                  * with files, report it as an error.
 655                                  */
 656                                 if (!dontreport && type != NULL &&
 657                                     strcmp(type, childtype) != 0) {
 658                                         if (ret != NULL)
 659                                                 free(ret);
 660                                         ret = NULL;
 661                                         if (fatal)
 662                                                 vdev_error(gettext(
 663                                                     "mismatched replication "
 664                                                     "level: %s contains both "
 665                                                     "files and devices\n"),
 666                                                     rep.zprl_type);
 667                                         else
 668                                                 return (NULL);
 669                                         dontreport = B_TRUE;
 670                                 }
 671
 672                                 /*
 673                                  * According to stat(2), the value of 'st_size'
 674                                  * is undefined for block devices and character
 675                                  * devices.  But there is no effective way to
 676                                  * determine the real size in userland.
 677                                  *
 678                                  * Instead, we'll take advantage of an
 679                                  * implementation detail of spec_size().  If the
 680                                  * device is currently open, then we (should)
 681                                  * return a valid size.
 682                                  *
 683                                  * If we still don't get a valid size (indicated
 684                                  * by a size of 0 or MAXOFFSET_T), then ignore
 685                                  * this device altogether.
 686                                  */
 687                                 if ((fd = open(path, O_RDONLY)) >= 0) {
 688                                         err = fstat64(fd, &statbuf);
 689                                         (void) close(fd);
 690                                 } else {
 691                                         err = stat64(path, &statbuf);
 692                                 }
 693
 694                                 if (err != 0 ||
 695                                     statbuf.st_size == 0 ||
 696                                     statbuf.st_size == MAXOFFSET_T)
 697                                         continue;
 698
 699                                 size = statbuf.st_size;
 700
 701                                 /*
 702                                  * Also make sure that devices and
 703                                  * slices have a consistent size.  If
 704                                  * they differ by a significant amount
 705                                  * (~16MB) then report an error.
 706                                  */
 707                                 if (!dontreport &&
 708                                     (vdev_size != -1ULL &&
 709                                     (labs(size - vdev_size) >
 710                                     ZPOOL_FUZZ))) {
 711                                         if (ret != NULL)
 712                                                 free(ret);
 713                                         ret = NULL;
 714                                         if (fatal)
 715                                                 vdev_error(gettext(
 716                                                     "%s contains devices of "
 717                                                     "different sizes\n"),
 718                                                     rep.zprl_type);
 719                                         else
 720                                                 return (NULL);
 721                                         dontreport = B_TRUE;
 722                                 }
 723
 724                                 type = childtype;
 725                                 vdev_size = size;
 726                         }
 727                 }
 728
 729                 /*
 730                  * At this point, we have the replication of the last toplevel
 731                  * vdev in 'rep'.  Compare it to 'lastrep' to see if its
 732                  * different.
 733                  */
 734                 if (lastrep.zprl_type != NULL) {
 735                         if (strcmp(lastrep.zprl_type, rep.zprl_type) != 0) {
 736                                 if (ret != NULL)
 737                                         free(ret);
 738                                 ret = NULL;
 739                                 if (fatal)
 740                                         vdev_error(gettext(
 741                                             "mismatched replication level: "
 742                                             "both %s and %s vdevs are "
 743                                             "present\n"),
 744                                             lastrep.zprl_type, rep.zprl_type);
 745                                 else
 746                                         return (NULL);
 747                         } else if (lastrep.zprl_parity != rep.zprl_parity) {
 748                                 if (ret)
 749                                         free(ret);
 750                                 ret = NULL;
 751                                 if (fatal)
 752                                         vdev_error(gettext(
 753                                             "mismatched replication level: "
 754                                             "both %llu and %llu device parity "
 755                                             "%s vdevs are present\n"),
 756                                             lastrep.zprl_parity,
 757                                             rep.zprl_parity,
 758                                             rep.zprl_type);
 759                                 else
 760                                         return (NULL);
 761                         } else if (lastrep.zprl_children != rep.zprl_children) {
 762                                 if (ret)
 763                                         free(ret);
 764                                 ret = NULL;
 765                                 if (fatal)
 766                                         vdev_error(gettext(
 767                                             "mismatched replication level: "
 768                                             "both %llu-way and %llu-way %s "
 769                                             "vdevs are present\n"),
 770                                             lastrep.zprl_children,
 771                                             rep.zprl_children,
 772                                             rep.zprl_type);
 773                                 else
 774                                         return (NULL);
 775                         }
 776                 }
 777                 lastrep = rep;
 778         }
 779
 780         if (ret != NULL)
 781                 *ret = rep;
 782
 783         return (ret);
 784 }
 785
 786 /*
 787  * Check the replication level of the vdev spec against the current pool.  Calls
 788  * get_replication() to make sure the new spec is self-consistent.  If the pool
 789  * has a consistent replication level, then we ignore any errors.  Otherwise,
 790  * report any difference between the two.
 791  */
 792 static int
 793 check_replication(nvlist_t *config, nvlist_t *newroot)
 794 {
 795         nvlist_t **child;
 796         uint_t  children;
 797         replication_level_t *current = NULL, *new;
 798         int ret;
 799
 800         /*
 801          * If we have a current pool configuration, check to see if it's
 802          * self-consistent.  If not, simply return success.
 803          */
 804         if (config != NULL) {
 805                 nvlist_t *nvroot;
 806
 807                 verify(nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE,
 808                     &nvroot) == 0);
 809                 if ((current = get_replication(nvroot, B_FALSE)) == NULL)
 810                         return (0);
 811         }
 812         /*
 813          * for spares there may be no children, and therefore no
 814          * replication level to check
 815          */
 816         if ((nvlist_lookup_nvlist_array(newroot, ZPOOL_CONFIG_CHILDREN,
 817             &child, &children) != 0) || (children == 0)) {
 818                 free(current);
 819                 return (0);
 820         }
 821
 822         /*
 823          * If all we have is logs then there's no replication level to check.
 824          */
 825         if (num_logs(newroot) == children) {
 826                 free(current);
 827                 return (0);
 828         }
 829
 830         /*
 831          * Get the replication level of the new vdev spec, reporting any
 832          * inconsistencies found.
 833          */
 834         if ((new = get_replication(newroot, B_TRUE)) == NULL) {
 835                 free(current);
 836                 return (-1);
 837         }
 838
 839         /*
 840          * Check to see if the new vdev spec matches the replication level of
 841          * the current pool.
 842          */
 843         ret = 0;
 844         if (current != NULL) {
 845                 if (strcmp(current->zprl_type, new->zprl_type) != 0) {
 846                         vdev_error(gettext(
 847                             "mismatched replication level: pool uses %s "
 848                             "and new vdev is %s\n"),
 849                             current->zprl_type, new->zprl_type);
 850                         ret = -1;
 851                 } else if (current->zprl_parity != new->zprl_parity) {
 852                         vdev_error(gettext(
 853                             "mismatched replication level: pool uses %llu "
 854                             "device parity and new vdev uses %llu\n"),
 855                             current->zprl_parity, new->zprl_parity);
 856                         ret = -1;
 857                 } else if (current->zprl_children != new->zprl_children) {
 858                         vdev_error(gettext(
 859                             "mismatched replication level: pool uses %llu-way "
 860                             "%s and new vdev uses %llu-way %s\n"),
 861                             current->zprl_children, current->zprl_type,
 862                             new->zprl_children, new->zprl_type);
 863                         ret = -1;
 864                 }
 865         }
 866
 867         free(new);
 868         if (current != NULL)
 869                 free(current);
 870
 871         return (ret);
 872 }
 873
 874 /*
 875  * Go through and find any whole disks in the vdev specification, labelling them
 876  * as appropriate.  When constructing the vdev spec, we were unable to open this
 877  * device in order to provide a devid.  Now that we have labelled the disk and
 878  * know that slice 0 is valid, we can construct the devid now.
 879  *
 880  * If the disk was already labeled with an EFI label, we will have gotten the
 881  * devid already (because we were able to open the whole disk).  Otherwise, we
 882  * need to get the devid after we label the disk.
 883  */
 884 static int
 885 make_disks(zpool_handle_t *zhp, nvlist_t *nv)
 886 {
 887         nvlist_t **child;
 888         uint_t c, children;
 889         char *type, *path, *diskname;
 890         char buf[MAXPATHLEN];
 891         uint64_t wholedisk;
 892         int fd;
 893         int ret;
 894         ddi_devid_t devid;
 895         char *minor = NULL, *devid_str = NULL;
 896
 897         verify(nvlist_lookup_string(nv, ZPOOL_CONFIG_TYPE, &type) == 0);
 898
 899         if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_CHILDREN,
 900             &child, &children) != 0) {
 901
 902                 if (strcmp(type, VDEV_TYPE_DISK) != 0)
 903                         return (0);
 904
 905                 /*
 906                  * We have a disk device.  Get the path to the device
 907                  * and see if it's a whole disk by appending the backup
 908                  * slice and stat()ing the device.
 909                  */
 910                 verify(nvlist_lookup_string(nv, ZPOOL_CONFIG_PATH, &path) == 0);
 911                 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_WHOLE_DISK,
 912                     &wholedisk) != 0 || !wholedisk)
 913                         return (0);
 914
 915                 diskname = strrchr(path, '/');
 916                 assert(diskname != NULL);
 917                 diskname++;
 918                 if (zpool_label_disk(g_zfs, zhp, diskname) == -1)
 919                         return (-1);
 920
 921                 /*
 922                  * Fill in the devid, now that we've labeled the disk.
 923                  */
 924                 (void) snprintf(buf, sizeof (buf), "%ss0", path);
 925                 if ((fd = open(buf, O_RDONLY)) < 0) {
 926                         (void) fprintf(stderr,
 927                             gettext("cannot open '%s': %s\n"),
 928                             buf, strerror(errno));
 929                         return (-1);
 930                 }
 931
 932                 if (devid_get(fd, &devid) == 0) {
 933                         if (devid_get_minor_name(fd, &minor) == 0 &&
 934                             (devid_str = devid_str_encode(devid, minor)) !=
 935                             NULL) {
 936                                 verify(nvlist_add_string(nv,
 937                                     ZPOOL_CONFIG_DEVID, devid_str) == 0);
 938                         }
 939                         if (devid_str != NULL)
 940                                 devid_str_free(devid_str);
 941                         if (minor != NULL)
 942                                 devid_str_free(minor);
 943                         devid_free(devid);
 944                 }
 945
 946                 /*
 947                  * Update the path to refer to the 's0' slice.  The presence of
 948                  * the 'whole_disk' field indicates to the CLI that we should
 949                  * chop off the slice number when displaying the device in
 950                  * future output.
 951                  */
 952                 verify(nvlist_add_string(nv, ZPOOL_CONFIG_PATH, buf) == 0);
 953
 954                 (void) close(fd);
 955
 956                 return (0);
 957         }
 958
 959         for (c = 0; c < children; c++)
 960                 if ((ret = make_disks(zhp, child[c])) != 0)
 961                         return (ret);
 962
 963         if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_SPARES,
 964             &child, &children) == 0)
 965                 for (c = 0; c < children; c++)
 966                         if ((ret = make_disks(zhp, child[c])) != 0)
 967                                 return (ret);
 968
 969         if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_L2CACHE,
 970             &child, &children) == 0)
 971                 for (c = 0; c < children; c++)
 972                         if ((ret = make_disks(zhp, child[c])) != 0)
 973                                 return (ret);
 974
 975         return (0);
 976 }
 977
 978 /*
 979  * Determine if the given path is a hot spare within the given configuration.
 980  */
 981 static boolean_t
 982 is_spare(nvlist_t *config, const char *path)
 983 {
 984         int fd;
 985         pool_state_t state;
 986         char *name = NULL;
 987         nvlist_t *label;
 988         uint64_t guid, spareguid;
 989         nvlist_t *nvroot;
 990         nvlist_t **spares;
 991         uint_t i, nspares;
 992         boolean_t inuse;
 993
 994         if ((fd = open(path, O_RDONLY)) < 0)
 995                 return (B_FALSE);
 996
 997         if (zpool_in_use(g_zfs, fd, &state, &name, &inuse) != 0 ||
 998             !inuse ||
 999             state != POOL_STATE_SPARE ||
1000             zpool_read_label(fd, &label) != 0) {
1001                 free(name);
1002                 (void) close(fd);
1003                 return (B_FALSE);
1004         }
1005         free(name);
1006         (void) close(fd);
1007
1008         verify(nvlist_lookup_uint64(label, ZPOOL_CONFIG_GUID, &guid) == 0);
1009         nvlist_free(label);
1010
1011         verify(nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE,
1012             &nvroot) == 0);
1013         if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_SPARES,
1014             &spares, &nspares) == 0) {
1015                 for (i = 0; i < nspares; i++) {
1016                         verify(nvlist_lookup_uint64(spares[i],
1017                             ZPOOL_CONFIG_GUID, &spareguid) == 0);
1018                         if (spareguid == guid)
1019                                 return (B_TRUE);
1020                 }
1021         }
1022
1023         return (B_FALSE);
1024 }
1025
1026 /*
1027  * Go through and find any devices that are in use.  We rely on libdiskmgt for
1028  * the majority of this task.
1029  */
1030 static int
1031 check_in_use(nvlist_t *config, nvlist_t *nv, boolean_t force,
1032     boolean_t replacing, boolean_t isspare)
1033 {
1034         nvlist_t **child;
1035         uint_t c, children;
1036         char *type, *path;
1037         int ret;
1038         char buf[MAXPATHLEN];
1039         uint64_t wholedisk;
1040
1041         verify(nvlist_lookup_string(nv, ZPOOL_CONFIG_TYPE, &type) == 0);
1042
1043         if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_CHILDREN,
1044             &child, &children) != 0) {
1045
1046                 verify(nvlist_lookup_string(nv, ZPOOL_CONFIG_PATH, &path) == 0);
1047
1048                 /*
1049                  * As a generic check, we look to see if this is a replace of a
1050                  * hot spare within the same pool.  If so, we allow it
1051                  * regardless of what libdiskmgt or zpool_in_use() says.
1052                  */
1053                 if (replacing) {
1054                         if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_WHOLE_DISK,
1055                             &wholedisk) == 0 && wholedisk)
1056                                 (void) snprintf(buf, sizeof (buf), "%ss0",
1057                                     path);
1058                         else
1059                                 (void) strlcpy(buf, path, sizeof (buf));
1060
1061                         if (is_spare(config, buf))
1062                                 return (0);
1063                 }
1064
1065                 if (strcmp(type, VDEV_TYPE_DISK) == 0)
1066                         ret = check_device(path, force, isspare);
1067
1068                 if (strcmp(type, VDEV_TYPE_FILE) == 0)
1069                         ret = check_file(path, force, isspare);
1070
1071                 return (ret);
1072         }
1073
1074         for (c = 0; c < children; c++)
1075                 if ((ret = check_in_use(config, child[c], force,
1076                     replacing, B_FALSE)) != 0)
1077                         return (ret);
1078
1079         if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_SPARES,
1080             &child, &children) == 0)
1081                 for (c = 0; c < children; c++)
1082                         if ((ret = check_in_use(config, child[c], force,
1083                             replacing, B_TRUE)) != 0)
1084                                 return (ret);
1085
1086         if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_L2CACHE,
1087             &child, &children) == 0)
1088                 for (c = 0; c < children; c++)
1089                         if ((ret = check_in_use(config, child[c], force,
1090                             replacing, B_FALSE)) != 0)
1091                                 return (ret);
1092
1093         return (0);
1094 }
1095
1096 static const char *
1097 is_grouping(const char *type, int *mindev, int *maxdev)
1098 {
1099         if (strncmp(type, "raidz", 5) == 0) {
1100                 const char *p = type + 5;
1101                 char *end;
1102                 long nparity;
1103
1104                 if (*p == '\0') {
1105                         nparity = 1;
1106                 } else if (*p == '0') {
1107                         return (NULL); /* no zero prefixes allowed */
1108                 } else {
1109                         errno = 0;
1110                         nparity = strtol(p, &end, 10);
1111                         if (errno != 0 || nparity < 1 || nparity >= 255 ||
1112                             *end != '\0')
1113                                 return (NULL);
1114                 }
1115
1116                 if (mindev != NULL)
1117                         *mindev = nparity + 1;
1118                 if (maxdev != NULL)
1119                         *maxdev = 255;
1120                 return (VDEV_TYPE_RAIDZ);
1121         }
1122
1123         if (maxdev != NULL)
1124                 *maxdev = INT_MAX;
1125
1126         if (strcmp(type, "mirror") == 0) {
1127                 if (mindev != NULL)
1128                         *mindev = 2;
1129                 return (VDEV_TYPE_MIRROR);
1130         }
1131
1132         if (strcmp(type, "spare") == 0) {
1133                 if (mindev != NULL)
1134                         *mindev = 1;
1135                 return (VDEV_TYPE_SPARE);
1136         }
1137
1138         if (strcmp(type, "log") == 0) {
1139                 if (mindev != NULL)
1140                         *mindev = 1;
1141                 return (VDEV_TYPE_LOG);
1142         }
1143
1144         if (strcmp(type, "cache") == 0) {
1145                 if (mindev != NULL)
1146                         *mindev = 1;
1147                 return (VDEV_TYPE_L2CACHE);
1148         }
1149
1150         return (NULL);
1151 }
1152
1153 /*
1154  * Construct a syntactically valid vdev specification,
1155  * and ensure that all devices and files exist and can be opened.
1156  * Note: we don't bother freeing anything in the error paths
1157  * because the program is just going to exit anyway.
1158  */
1159 nvlist_t *
1160 construct_spec(int argc, char **argv)
1161 {
1162         nvlist_t *nvroot, *nv, **top, **spares, **l2cache;
1163         int t, toplevels, mindev, maxdev, nspares, nlogs, nl2cache;
1164         const char *type;
1165         uint64_t is_log;
1166         boolean_t seen_logs;
1167
1168         top = NULL;
1169         toplevels = 0;
1170         spares = NULL;
1171         l2cache = NULL;
1172         nspares = 0;
1173         nlogs = 0;
1174         nl2cache = 0;
1175         is_log = B_FALSE;
1176         seen_logs = B_FALSE;
1177
1178         while (argc > 0) {
1179                 nv = NULL;
1180
1181                 /*
1182                  * If it's a mirror or raidz, the subsequent arguments are
1183                  * its leaves -- until we encounter the next mirror or raidz.
1184                  */
1185                 if ((type = is_grouping(argv[0], &mindev, &maxdev)) != NULL) {
1186                         nvlist_t **child = NULL;
1187                         int c, children = 0;
1188
1189                         if (strcmp(type, VDEV_TYPE_SPARE) == 0) {
1190                                 if (spares != NULL) {
1191                                         (void) fprintf(stderr,
1192                                             gettext("invalid vdev "
1193                                             "specification: 'spare' can be "
1194                                             "specified only once\n"));
1195                                         return (NULL);
1196                                 }
1197                                 is_log = B_FALSE;
1198                         }
1199
1200                         if (strcmp(type, VDEV_TYPE_LOG) == 0) {
1201                                 if (seen_logs) {
1202                                         (void) fprintf(stderr,
1203                                             gettext("invalid vdev "
1204                                             "specification: 'log' can be "
1205                                             "specified only once\n"));
1206                                         return (NULL);
1207                                 }
1208                                 seen_logs = B_TRUE;
1209                                 is_log = B_TRUE;
1210                                 argc--;
1211                                 argv++;
1212                                 /*
1213                                  * A log is not a real grouping device.
1214                                  * We just set is_log and continue.
1215                                  */
1216                                 continue;
1217                         }
1218
1219                         if (strcmp(type, VDEV_TYPE_L2CACHE) == 0) {
1220                                 if (l2cache != NULL) {
1221                                         (void) fprintf(stderr,
1222                                             gettext("invalid vdev "
1223                                             "specification: 'cache' can be "
1224                                             "specified only once\n"));
1225                                         return (NULL);
1226                                 }
1227                                 is_log = B_FALSE;
1228                         }
1229
1230                         if (is_log) {
1231                                 if (strcmp(type, VDEV_TYPE_MIRROR) != 0) {
1232                                         (void) fprintf(stderr,
1233                                             gettext("invalid vdev "
1234                                             "specification: unsupported 'log' "
1235                                             "device: %s\n"), type);
1236                                         return (NULL);
1237                                 }
1238                                 nlogs++;
1239                         }
1240
1241                         for (c = 1; c < argc; c++) {
1242                                 if (is_grouping(argv[c], NULL, NULL) != NULL)
1243                                         break;
1244                                 children++;
1245                                 child = realloc(child,
1246                                     children * sizeof (nvlist_t *));
1247                                 if (child == NULL)
1248                                         zpool_no_memory();
1249                                 if ((nv = make_leaf_vdev(argv[c], B_FALSE))
1250                                     == NULL)
1251                                         return (NULL);
1252                                 child[children - 1] = nv;
1253                         }
1254
1255                         if (children < mindev) {
1256                                 (void) fprintf(stderr, gettext("invalid vdev "
1257                                     "specification: %s requires at least %d "
1258                                     "devices\n"), argv[0], mindev);
1259                                 return (NULL);
1260                         }
1261
1262                         if (children > maxdev) {
1263                                 (void) fprintf(stderr, gettext("invalid vdev "
1264                                     "specification: %s supports no more than "
1265                                     "%d devices\n"), argv[0], maxdev);
1266                                 return (NULL);
1267                         }
1268
1269                         argc -= c;
1270                         argv += c;
1271
1272                         if (strcmp(type, VDEV_TYPE_SPARE) == 0) {
1273                                 spares = child;
1274                                 nspares = children;
1275                                 continue;
1276                         } else if (strcmp(type, VDEV_TYPE_L2CACHE) == 0) {
1277                                 l2cache = child;
1278                                 nl2cache = children;
1279                                 continue;
1280                         } else {
1281                                 verify(nvlist_alloc(&nv, NV_UNIQUE_NAME,
1282                                     0) == 0);
1283                                 verify(nvlist_add_string(nv, ZPOOL_CONFIG_TYPE,
1284                                     type) == 0);
1285                                 verify(nvlist_add_uint64(nv,
1286                                     ZPOOL_CONFIG_IS_LOG, is_log) == 0);
1287                                 if (strcmp(type, VDEV_TYPE_RAIDZ) == 0) {
1288                                         verify(nvlist_add_uint64(nv,
1289                                             ZPOOL_CONFIG_NPARITY,
1290                                             mindev - 1) == 0);
1291                                 }
1292                                 verify(nvlist_add_nvlist_array(nv,
1293                                     ZPOOL_CONFIG_CHILDREN, child,
1294                                     children) == 0);
1295
1296                                 for (c = 0; c < children; c++)
1297                                         nvlist_free(child[c]);
1298                                 free(child);
1299                         }
1300                 } else {
1301                         /*
1302                          * We have a device.  Pass off to make_leaf_vdev() to
1303                          * construct the appropriate nvlist describing the vdev.
1304                          */
1305                         if ((nv = make_leaf_vdev(argv[0], is_log)) == NULL)
1306                                 return (NULL);
1307                         if (is_log)
1308                                 nlogs++;
1309                         argc--;
1310                         argv++;
1311                 }
1312
1313                 toplevels++;
1314                 top = realloc(top, toplevels * sizeof (nvlist_t *));
1315                 if (top == NULL)
1316                         zpool_no_memory();
1317                 top[toplevels - 1] = nv;
1318         }
1319
1320         if (toplevels == 0 && nspares == 0 && nl2cache == 0) {
1321                 (void) fprintf(stderr, gettext("invalid vdev "
1322                     "specification: at least one toplevel vdev must be "
1323                     "specified\n"));
1324                 return (NULL);
1325         }
1326
1327         if (seen_logs && nlogs == 0) {
1328                 (void) fprintf(stderr, gettext("invalid vdev specification: "
1329                     "log requires at least 1 device\n"));
1330                 return (NULL);
1331         }
1332
1333         /*
1334          * Finally, create nvroot and add all top-level vdevs to it.
1335          */
1336         verify(nvlist_alloc(&nvroot, NV_UNIQUE_NAME, 0) == 0);
1337         verify(nvlist_add_string(nvroot, ZPOOL_CONFIG_TYPE,
1338             VDEV_TYPE_ROOT) == 0);
1339         verify(nvlist_add_nvlist_array(nvroot, ZPOOL_CONFIG_CHILDREN,
1340             top, toplevels) == 0);
1341         if (nspares != 0)
1342                 verify(nvlist_add_nvlist_array(nvroot, ZPOOL_CONFIG_SPARES,
1343                     spares, nspares) == 0);
1344         if (nl2cache != 0)
1345                 verify(nvlist_add_nvlist_array(nvroot, ZPOOL_CONFIG_L2CACHE,
1346                     l2cache, nl2cache) == 0);
1347
1348         for (t = 0; t < toplevels; t++)
1349                 nvlist_free(top[t]);
1350         for (t = 0; t < nspares; t++)
1351                 nvlist_free(spares[t]);
1352         for (t = 0; t < nl2cache; t++)
1353                 nvlist_free(l2cache[t]);
1354         if (spares)
1355                 free(spares);
1356         if (l2cache)
1357                 free(l2cache);
1358         free(top);
1359
1360         return (nvroot);
1361 }
1362
1363 nvlist_t *
1364 split_mirror_vdev(zpool_handle_t *zhp, char *newname, nvlist_t *props,
1365     splitflags_t flags, int argc, char **argv)
1366 {
1367         nvlist_t *newroot = NULL, **child;
1368         uint_t c, children;
1369
1370         if (argc > 0) {
1371                 if ((newroot = construct_spec(argc, argv)) == NULL) {
1372                         (void) fprintf(stderr, gettext("Unable to build a "
1373                             "pool from the specified devices\n"));
1374                         return (NULL);
1375                 }
1376
1377                 if (!flags.dryrun && make_disks(zhp, newroot) != 0) {
1378                         nvlist_free(newroot);
1379                         return (NULL);
1380                 }
1381
1382                 /* avoid any tricks in the spec */
1383                 verify(nvlist_lookup_nvlist_array(newroot,
1384                     ZPOOL_CONFIG_CHILDREN, &child, &children) == 0);
1385                 for (c = 0; c < children; c++) {
1386                         char *path;
1387                         const char *type;
1388                         int min, max;
1389
1390                         verify(nvlist_lookup_string(child[c],
1391                             ZPOOL_CONFIG_PATH, &path) == 0);
1392                         if ((type = is_grouping(path, &min, &max)) != NULL) {
1393                                 (void) fprintf(stderr, gettext("Cannot use "
1394                                     "'%s' as a device for splitting\n"), type);
1395                                 nvlist_free(newroot);
1396                                 return (NULL);
1397                         }
1398                 }
1399         }
1400
1401         if (zpool_vdev_split(zhp, newname, &newroot, props, flags) != 0) {
1402                 if (newroot != NULL)
1403                         nvlist_free(newroot);
1404                 return (NULL);
1405         }
1406
1407         return (newroot);
1408 }
1409
1410 /*
1411  * Get and validate the contents of the given vdev specification.  This ensures
1412  * that the nvlist returned is well-formed, that all the devices exist, and that
1413  * they are not currently in use by any other known consumer.  The 'poolconfig'
1414  * parameter is the current configuration of the pool when adding devices
1415  * existing pool, and is used to perform additional checks, such as changing the
1416  * replication level of the pool.  It can be 'NULL' to indicate that this is a
1417  * new pool.  The 'force' flag controls whether devices should be forcefully
1418  * added, even if they appear in use.
1419  */
1420 nvlist_t *
1421 make_root_vdev(zpool_handle_t *zhp, int force, int check_rep,
1422     boolean_t replacing, boolean_t dryrun, int argc, char **argv)
1423 {
1424         nvlist_t *newroot;
1425         nvlist_t *poolconfig = NULL;
1426         is_force = force;
1427
1428         /*
1429          * Construct the vdev specification.  If this is successful, we know
1430          * that we have a valid specification, and that all devices can be
1431          * opened.
1432          */
1433         if ((newroot = construct_spec(argc, argv)) == NULL)
1434                 return (NULL);
1435
1436         if (zhp && ((poolconfig = zpool_get_config(zhp, NULL)) == NULL))
1437                 return (NULL);
1438
1439         /*
1440          * Validate each device to make sure that its not shared with another
1441          * subsystem.  We do this even if 'force' is set, because there are some
1442          * uses (such as a dedicated dump device) that even '-f' cannot
1443          * override.
1444          */
1445         if (check_in_use(poolconfig, newroot, force, replacing, B_FALSE) != 0) {
1446                 nvlist_free(newroot);
1447                 return (NULL);
1448         }
1449
1450         /*
1451          * Check the replication level of the given vdevs and report any errors
1452          * found.  We include the existing pool spec, if any, as we need to
1453          * catch changes against the existing replication level.
1454          */
1455         if (check_rep && check_replication(poolconfig, newroot) != 0) {
1456                 nvlist_free(newroot);
1457                 return (NULL);
1458         }
1459
1460         /*
1461          * Run through the vdev specification and label any whole disks found.
1462          */
1463         if (!dryrun && make_disks(zhp, newroot) != 0) {
1464                 nvlist_free(newroot);
1465                 return (NULL);
1466         }
1467
1468         return (newroot);
1469 }