cddl/contrib/opensolaris/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  * Copyright (c) 2013, 2015 by Delphix. All rights reserved.
  25  * Copyright 2016 Igor Kozhukhov <ikozhukhov@gmail.com>.
  26  */
  27
  28 /*
  29  * Functions to convert between a list of vdevs and an nvlist representing the
  30  * configuration.  Each entry in the list can be one of:
  31  *
  32  *      Device vdevs
  33  *              disk=(path=..., devid=...)
  34  *              file=(path=...)
  35  *
  36  *      Group vdevs
  37  *              raidz[1|2]=(...)
  38  *              mirror=(...)
  39  *
  40  *      Hot spares
  41  *
  42  * While the underlying implementation supports it, group vdevs cannot contain
  43  * other group vdevs.  All userland verification of devices is contained within
  44  * this file.  If successful, the nvlist returned can be passed directly to the
  45  * kernel; we've done as much verification as possible in userland.
  46  *
  47  * Hot spares are a special case, and passed down as an array of disk vdevs, at
  48  * the same level as the root of the vdev tree.
  49  *
  50  * The only function exported by this file is 'make_root_vdev'.  The
  51  * function performs several passes:
  52  *
  53  *      1. Construct the vdev specification.  Performs syntax validation and
  54  *         makes sure each device is valid.
  55  *      2. Check for devices in use.  Using libdiskmgt, makes sure that no
  56  *         devices are also in use.  Some can be overridden using the 'force'
  57  *         flag, others cannot.
  58  *      3. Check for replication errors if the 'force' flag is not specified.
  59  *         validates that the replication level is consistent across the
  60  *         entire pool.
  61  *      4. Call libzfs to label any whole disks with an EFI label.
  62  */
  63
  64 #include <assert.h>
  65 #include <devid.h>
  66 #include <errno.h>
  67 #include <fcntl.h>
  68 #include <libintl.h>
  69 #include <libnvpair.h>
  70 #include <limits.h>
  71 #include <stdio.h>
  72 #include <string.h>
  73 #include <unistd.h>
  74 #include <paths.h>
  75 #include <sys/stat.h>
  76 #include <sys/disk.h>
  77 #include <sys/mntent.h>
  78 #include <libgeom.h>
  79
  80 #include "zpool_util.h"
  81
  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 #ifdef illumos
 115 static void
 116 libdiskmgt_error(int error)
 117 {
 118         /*
 119          * ENXIO/ENODEV is a valid error message if the device doesn't live in
 120          * /dev/dsk.  Don't bother printing an error message in this case.
 121          */
 122         if (error == ENXIO || error == ENODEV)
 123                 return;
 124
 125         (void) fprintf(stderr, gettext("warning: device in use checking "
 126             "failed: %s\n"), strerror(error));
 127 }
 128
 129 /*
 130  * Validate a device, passing the bulk of the work off to libdiskmgt.
 131  */
 132 static int
 133 check_slice(const char *path, int force, boolean_t wholedisk, boolean_t isspare)
 134 {
 135         char *msg;
 136         int error = 0;
 137         dm_who_type_t who;
 138
 139         if (force)
 140                 who = DM_WHO_ZPOOL_FORCE;
 141         else if (isspare)
 142                 who = DM_WHO_ZPOOL_SPARE;
 143         else
 144                 who = DM_WHO_ZPOOL;
 145
 146         if (dm_inuse((char *)path, &msg, who, &error) || error) {
 147                 if (error != 0) {
 148                         libdiskmgt_error(error);
 149                         return (0);
 150                 } else {
 151                         vdev_error("%s", msg);
 152                         free(msg);
 153                         return (-1);
 154                 }
 155         }
 156
 157         /*
 158          * If we're given a whole disk, ignore overlapping slices since we're
 159          * about to label it anyway.
 160          */
 161         error = 0;
 162         if (!wholedisk && !force &&
 163             (dm_isoverlapping((char *)path, &msg, &error) || error)) {
 164                 if (error == 0) {
 165                         /* dm_isoverlapping returned -1 */
 166                         vdev_error(gettext("%s overlaps with %s\n"), path, msg);
 167                         free(msg);
 168                         return (-1);
 169                 } else if (error != ENODEV) {
 170                         /* libdiskmgt's devcache only handles physical drives */
 171                         libdiskmgt_error(error);
 172                         return (0);
 173                 }
 174         }
 175
 176         return (0);
 177 }
 178
 179
 180 /*
 181  * Validate a whole disk.  Iterate over all slices on the disk and make sure
 182  * that none is in use by calling check_slice().
 183  */
 184 static int
 185 check_disk(const char *name, dm_descriptor_t disk, int force, int isspare)
 186 {
 187         dm_descriptor_t *drive, *media, *slice;
 188         int err = 0;
 189         int i;
 190         int ret;
 191
 192         /*
 193          * Get the drive associated with this disk.  This should never fail,
 194          * because we already have an alias handle open for the device.
 195          */
 196         if ((drive = dm_get_associated_descriptors(disk, DM_DRIVE,
 197             &err)) == NULL || *drive == NULL) {
 198                 if (err)
 199                         libdiskmgt_error(err);
 200                 return (0);
 201         }
 202
 203         if ((media = dm_get_associated_descriptors(*drive, DM_MEDIA,
 204             &err)) == NULL) {
 205                 dm_free_descriptors(drive);
 206                 if (err)
 207                         libdiskmgt_error(err);
 208                 return (0);
 209         }
 210
 211         dm_free_descriptors(drive);
 212
 213         /*
 214          * It is possible that the user has specified a removable media drive,
 215          * and the media is not present.
 216          */
 217         if (*media == NULL) {
 218                 dm_free_descriptors(media);
 219                 vdev_error(gettext("'%s' has no media in drive\n"), name);
 220                 return (-1);
 221         }
 222
 223         if ((slice = dm_get_associated_descriptors(*media, DM_SLICE,
 224             &err)) == NULL) {
 225                 dm_free_descriptors(media);
 226                 if (err)
 227                         libdiskmgt_error(err);
 228                 return (0);
 229         }
 230
 231         dm_free_descriptors(media);
 232
 233         ret = 0;
 234
 235         /*
 236          * Iterate over all slices and report any errors.  We don't care about
 237          * overlapping slices because we are using the whole disk.
 238          */
 239         for (i = 0; slice[i] != NULL; i++) {
 240                 char *name = dm_get_name(slice[i], &err);
 241
 242                 if (check_slice(name, force, B_TRUE, isspare) != 0)
 243                         ret = -1;
 244
 245                 dm_free_name(name);
 246         }
 247
 248         dm_free_descriptors(slice);
 249         return (ret);
 250 }
 251
 252 /*
 253  * Validate a device.
 254  */
 255 static int
 256 check_device(const char *path, boolean_t force, boolean_t isspare)
 257 {
 258         dm_descriptor_t desc;
 259         int err;
 260         char *dev;
 261
 262         /*
 263          * For whole disks, libdiskmgt does not include the leading dev path.
 264          */
 265         dev = strrchr(path, '/');
 266         assert(dev != NULL);
 267         dev++;
 268         if ((desc = dm_get_descriptor_by_name(DM_ALIAS, dev, &err)) != NULL) {
 269                 err = check_disk(path, desc, force, isspare);
 270                 dm_free_descriptor(desc);
 271                 return (err);
 272         }
 273
 274         return (check_slice(path, force, B_FALSE, isspare));
 275 }
 276 #endif  /* illumos */
 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 #ifdef illumos
 293         if (dm_inuse_swap(file, &err)) {
 294                 if (err)
 295                         libdiskmgt_error(err);
 296                 else
 297                         vdev_error(gettext("%s is currently used by swap. "
 298                             "Please see swap(1M).\n"), file);
 299                 return (-1);
 300         }
 301 #endif
 302
 303         if ((fd = open(file, O_RDONLY)) < 0)
 304                 return (0);
 305
 306         if (zpool_in_use(g_zfs, fd, &state, &name, &inuse) == 0 && inuse) {
 307                 const char *desc;
 308
 309                 switch (state) {
 310                 case POOL_STATE_ACTIVE:
 311                         desc = gettext("active");
 312                         break;
 313
 314                 case POOL_STATE_EXPORTED:
 315                         desc = gettext("exported");
 316                         break;
 317
 318                 case POOL_STATE_POTENTIALLY_ACTIVE:
 319                         desc = gettext("potentially active");
 320                         break;
 321
 322                 default:
 323                         desc = gettext("unknown");
 324                         break;
 325                 }
 326
 327                 /*
 328                  * Allow hot spares to be shared between pools.
 329                  */
 330                 if (state == POOL_STATE_SPARE && isspare)
 331                         return (0);
 332
 333                 if (state == POOL_STATE_ACTIVE ||
 334                     state == POOL_STATE_SPARE || !force) {
 335                         switch (state) {
 336                         case POOL_STATE_SPARE:
 337                                 vdev_error(gettext("%s is reserved as a hot "
 338                                     "spare for pool %s\n"), file, name);
 339                                 break;
 340                         default:
 341                                 vdev_error(gettext("%s is part of %s pool "
 342                                     "'%s'\n"), file, desc, name);
 343                                 break;
 344                         }
 345                         ret = -1;
 346                 }
 347
 348                 free(name);
 349         }
 350
 351         (void) close(fd);
 352         return (ret);
 353 }
 354
 355 static int
 356 check_device(const char *name, boolean_t force, boolean_t isspare)
 357 {
 358         char path[MAXPATHLEN];
 359
 360         if (strncmp(name, _PATH_DEV, sizeof(_PATH_DEV) - 1) != 0)
 361                 snprintf(path, sizeof(path), "%s%s", _PATH_DEV, name);
 362         else
 363                 strlcpy(path, name, sizeof(path));
 364
 365         return (check_file(path, force, isspare));
 366 }
 367
 368 /*
 369  * By "whole disk" we mean an entire physical disk (something we can
 370  * label, toggle the write cache on, etc.) as opposed to the full
 371  * capacity of a pseudo-device such as lofi or did.  We act as if we
 372  * are labeling the disk, which should be a pretty good test of whether
 373  * it's a viable device or not.  Returns B_TRUE if it is and B_FALSE if
 374  * it isn't.
 375  */
 376 static boolean_t
 377 is_whole_disk(const char *arg)
 378 {
 379 #ifdef illumos
 380         struct dk_gpt *label;
 381         int     fd;
 382         char    path[MAXPATHLEN];
 383
 384         (void) snprintf(path, sizeof (path), "%s%s%s",
 385             ZFS_RDISK_ROOT, strrchr(arg, '/'), BACKUP_SLICE);
 386         if ((fd = open(path, O_RDWR | O_NDELAY)) < 0)
 387                 return (B_FALSE);
 388         if (efi_alloc_and_init(fd, EFI_NUMPAR, &label) != 0) {
 389                 (void) close(fd);
 390                 return (B_FALSE);
 391         }
 392         efi_free(label);
 393         (void) close(fd);
 394         return (B_TRUE);
 395 #else
 396         int fd;
 397
 398         fd = g_open(arg, 0);
 399         if (fd >= 0) {
 400                 g_close(fd);
 401                 return (B_TRUE);
 402         }
 403         return (B_FALSE);
 404 #endif
 405 }
 406
 407 /*
 408  * Create a leaf vdev.  Determine if this is a file or a device.  If it's a
 409  * device, fill in the device id to make a complete nvlist.  Valid forms for a
 410  * leaf vdev are:
 411  *
 412  *      /dev/dsk/xxx    Complete disk path
 413  *      /xxx            Full path to file
 414  *      xxx             Shorthand for /dev/dsk/xxx
 415  */
 416 static nvlist_t *
 417 make_leaf_vdev(const char *arg, uint64_t is_log)
 418 {
 419         char path[MAXPATHLEN];
 420         struct stat64 statbuf;
 421         nvlist_t *vdev = NULL;
 422         char *type = NULL;
 423         boolean_t wholedisk = B_FALSE;
 424
 425         /*
 426          * Determine what type of vdev this is, and put the full path into
 427          * 'path'.  We detect whether this is a device of file afterwards by
 428          * checking the st_mode of the file.
 429          */
 430         if (arg[0] == '/') {
 431                 /*
 432                  * Complete device or file path.  Exact type is determined by
 433                  * examining the file descriptor afterwards.
 434                  */
 435                 wholedisk = is_whole_disk(arg);
 436                 if (!wholedisk && (stat64(arg, &statbuf) != 0)) {
 437                         (void) fprintf(stderr,
 438                             gettext("cannot open '%s': %s\n"),
 439                             arg, strerror(errno));
 440                         return (NULL);
 441                 }
 442
 443                 (void) strlcpy(path, arg, sizeof (path));
 444         } else {
 445                 /*
 446                  * This may be a short path for a device, or it could be total
 447                  * gibberish.  Check to see if it's a known device in
 448                  * /dev/dsk/.  As part of this check, see if we've been given a
 449                  * an entire disk (minus the slice number).
 450                  */
 451                 if (strncmp(arg, _PATH_DEV, sizeof(_PATH_DEV) - 1) == 0)
 452                         strlcpy(path, arg, sizeof (path));
 453                 else
 454                         snprintf(path, sizeof (path), "%s%s", _PATH_DEV, arg);
 455                 wholedisk = is_whole_disk(path);
 456                 if (!wholedisk && (stat64(path, &statbuf) != 0)) {
 457                         /*
 458                          * If we got ENOENT, then the user gave us
 459                          * gibberish, so try to direct them with a
 460                          * reasonable error message.  Otherwise,
 461                          * regurgitate strerror() since it's the best we
 462                          * can do.
 463                          */
 464                         if (errno == ENOENT) {
 465                                 (void) fprintf(stderr,
 466                                     gettext("cannot open '%s': no such "
 467                                     "GEOM provider\n"), arg);
 468                                 (void) fprintf(stderr,
 469                                     gettext("must be a full path or "
 470                                     "shorthand device name\n"));
 471                                 return (NULL);
 472                         } else {
 473                                 (void) fprintf(stderr,
 474                                     gettext("cannot open '%s': %s\n"),
 475                                     path, strerror(errno));
 476                                 return (NULL);
 477                         }
 478                 }
 479         }
 480
 481 #ifdef __FreeBSD__
 482         if (S_ISCHR(statbuf.st_mode)) {
 483                 statbuf.st_mode &= ~S_IFCHR;
 484                 statbuf.st_mode |= S_IFBLK;
 485                 wholedisk = B_FALSE;
 486         }
 487 #endif
 488
 489         /*
 490          * Determine whether this is a device or a file.
 491          */
 492         if (wholedisk || S_ISBLK(statbuf.st_mode)) {
 493                 type = VDEV_TYPE_DISK;
 494         } else if (S_ISREG(statbuf.st_mode)) {
 495                 type = VDEV_TYPE_FILE;
 496         } else {
 497                 (void) fprintf(stderr, gettext("cannot use '%s': must be a "
 498                     "GEOM provider or regular file\n"), path);
 499                 return (NULL);
 500         }
 501
 502         /*
 503          * Finally, we have the complete device or file, and we know that it is
 504          * acceptable to use.  Construct the nvlist to describe this vdev.  All
 505          * vdevs have a 'path' element, and devices also have a 'devid' element.
 506          */
 507         verify(nvlist_alloc(&vdev, NV_UNIQUE_NAME, 0) == 0);
 508         verify(nvlist_add_string(vdev, ZPOOL_CONFIG_PATH, path) == 0);
 509         verify(nvlist_add_string(vdev, ZPOOL_CONFIG_TYPE, type) == 0);
 510         verify(nvlist_add_uint64(vdev, ZPOOL_CONFIG_IS_LOG, is_log) == 0);
 511         if (strcmp(type, VDEV_TYPE_DISK) == 0)
 512                 verify(nvlist_add_uint64(vdev, ZPOOL_CONFIG_WHOLE_DISK,
 513                     (uint64_t)wholedisk) == 0);
 514
 515 #ifdef have_devid
 516         /*
 517          * For a whole disk, defer getting its devid until after labeling it.
 518          */
 519         if (S_ISBLK(statbuf.st_mode) && !wholedisk) {
 520                 /*
 521                  * Get the devid for the device.
 522                  */
 523                 int fd;
 524                 ddi_devid_t devid;
 525                 char *minor = NULL, *devid_str = NULL;
 526
 527                 if ((fd = open(path, O_RDONLY)) < 0) {
 528                         (void) fprintf(stderr, gettext("cannot open '%s': "
 529                             "%s\n"), path, strerror(errno));
 530                         nvlist_free(vdev);
 531                         return (NULL);
 532                 }
 533
 534                 if (devid_get(fd, &devid) == 0) {
 535                         if (devid_get_minor_name(fd, &minor) == 0 &&
 536                             (devid_str = devid_str_encode(devid, minor)) !=
 537                             NULL) {
 538                                 verify(nvlist_add_string(vdev,
 539                                     ZPOOL_CONFIG_DEVID, devid_str) == 0);
 540                         }
 541                         if (devid_str != NULL)
 542                                 devid_str_free(devid_str);
 543                         if (minor != NULL)
 544                                 devid_str_free(minor);
 545                         devid_free(devid);
 546                 }
 547
 548                 (void) close(fd);
 549         }
 550 #endif
 551
 552         return (vdev);
 553 }
 554
 555 /*
 556  * Go through and verify the replication level of the pool is consistent.
 557  * Performs the following checks:
 558  *
 559  *      For the new spec, verifies that devices in mirrors and raidz are the
 560  *      same size.
 561  *
 562  *      If the current configuration already has inconsistent replication
 563  *      levels, ignore any other potential problems in the new spec.
 564  *
 565  *      Otherwise, make sure that the current spec (if there is one) and the new
 566  *      spec have consistent replication levels.
 567  */
 568 typedef struct replication_level {
 569         char *zprl_type;
 570         uint64_t zprl_children;
 571         uint64_t zprl_parity;
 572 } replication_level_t;
 573
 574 #define ZPOOL_FUZZ      (16 * 1024 * 1024)
 575
 576 /*
 577  * Given a list of toplevel vdevs, return the current replication level.  If
 578  * the config is inconsistent, then NULL is returned.  If 'fatal' is set, then
 579  * an error message will be displayed for each self-inconsistent vdev.
 580  */
 581 static replication_level_t *
 582 get_replication(nvlist_t *nvroot, boolean_t fatal)
 583 {
 584         nvlist_t **top;
 585         uint_t t, toplevels;
 586         nvlist_t **child;
 587         uint_t c, children;
 588         nvlist_t *nv;
 589         char *type;
 590         replication_level_t lastrep = {0};
 591         replication_level_t rep;
 592         replication_level_t *ret;
 593         boolean_t dontreport;
 594
 595         ret = safe_malloc(sizeof (replication_level_t));
 596
 597         verify(nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_CHILDREN,
 598             &top, &toplevels) == 0);
 599
 600         for (t = 0; t < toplevels; t++) {
 601                 uint64_t is_log = B_FALSE;
 602
 603                 nv = top[t];
 604
 605                 /*
 606                  * For separate logs we ignore the top level vdev replication
 607                  * constraints.
 608                  */
 609                 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_IS_LOG, &is_log);
 610                 if (is_log)
 611                         continue;
 612
 613                 verify(nvlist_lookup_string(nv, ZPOOL_CONFIG_TYPE,
 614                     &type) == 0);
 615                 if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_CHILDREN,
 616                     &child, &children) != 0) {
 617                         /*
 618                          * This is a 'file' or 'disk' vdev.
 619                          */
 620                         rep.zprl_type = type;
 621                         rep.zprl_children = 1;
 622                         rep.zprl_parity = 0;
 623                 } else {
 624                         uint64_t vdev_size;
 625
 626                         /*
 627                          * This is a mirror or RAID-Z vdev.  Go through and make
 628                          * sure the contents are all the same (files vs. disks),
 629                          * keeping track of the number of elements in the
 630                          * process.
 631                          *
 632                          * We also check that the size of each vdev (if it can
 633                          * be determined) is the same.
 634                          */
 635                         rep.zprl_type = type;
 636                         rep.zprl_children = 0;
 637
 638                         if (strcmp(type, VDEV_TYPE_RAIDZ) == 0) {
 639                                 verify(nvlist_lookup_uint64(nv,
 640                                     ZPOOL_CONFIG_NPARITY,
 641                                     &rep.zprl_parity) == 0);
 642                                 assert(rep.zprl_parity != 0);
 643                         } else {
 644                                 rep.zprl_parity = 0;
 645                         }
 646
 647                         /*
 648                          * The 'dontreport' variable indicates that we've
 649                          * already reported an error for this spec, so don't
 650                          * bother doing it again.
 651                          */
 652                         type = NULL;
 653                         dontreport = 0;
 654                         vdev_size = -1ULL;
 655                         for (c = 0; c < children; c++) {
 656                                 boolean_t is_replacing, is_spare;
 657                                 nvlist_t *cnv = child[c];
 658                                 char *path;
 659                                 struct stat64 statbuf;
 660                                 uint64_t size = -1ULL;
 661                                 char *childtype;
 662                                 int fd, err;
 663
 664                                 rep.zprl_children++;
 665
 666                                 verify(nvlist_lookup_string(cnv,
 667                                     ZPOOL_CONFIG_TYPE, &childtype) == 0);
 668
 669                                 /*
 670                                  * If this is a replacing or spare vdev, then
 671                                  * get the real first child of the vdev.
 672                                  */
 673                                 is_replacing = strcmp(childtype,
 674                                     VDEV_TYPE_REPLACING) == 0;
 675                                 is_spare = strcmp(childtype,
 676                                     VDEV_TYPE_SPARE) == 0;
 677                                 if (is_replacing || is_spare) {
 678                                         nvlist_t **rchild;
 679                                         uint_t rchildren;
 680
 681                                         verify(nvlist_lookup_nvlist_array(cnv,
 682                                             ZPOOL_CONFIG_CHILDREN, &rchild,
 683                                             &rchildren) == 0);
 684                                         assert((is_replacing && rchildren == 2)
 685                                             || (is_spare && rchildren >= 2));
 686                                         cnv = rchild[0];
 687
 688                                         verify(nvlist_lookup_string(cnv,
 689                                             ZPOOL_CONFIG_TYPE,
 690                                             &childtype) == 0);
 691                                 }
 692
 693                                 verify(nvlist_lookup_string(cnv,
 694                                     ZPOOL_CONFIG_PATH, &path) == 0);
 695
 696                                 /*
 697                                  * If we have a raidz/mirror that combines disks
 698                                  * with files, report it as an error.
 699                                  */
 700                                 if (!dontreport && type != NULL &&
 701                                     strcmp(type, childtype) != 0) {
 702                                         if (ret != NULL)
 703                                                 free(ret);
 704                                         ret = NULL;
 705                                         if (fatal)
 706                                                 vdev_error(gettext(
 707                                                     "mismatched replication "
 708                                                     "level: %s contains both "
 709                                                     "files and devices\n"),
 710                                                     rep.zprl_type);
 711                                         else
 712                                                 return (NULL);
 713                                         dontreport = B_TRUE;
 714                                 }
 715
 716                                 /*
 717                                  * According to stat(2), the value of 'st_size'
 718                                  * is undefined for block devices and character
 719                                  * devices.  But there is no effective way to
 720                                  * determine the real size in userland.
 721                                  *
 722                                  * Instead, we'll take advantage of an
 723                                  * implementation detail of spec_size().  If the
 724                                  * device is currently open, then we (should)
 725                                  * return a valid size.
 726                                  *
 727                                  * If we still don't get a valid size (indicated
 728                                  * by a size of 0 or MAXOFFSET_T), then ignore
 729                                  * this device altogether.
 730                                  */
 731                                 if ((fd = open(path, O_RDONLY)) >= 0) {
 732                                         err = fstat64(fd, &statbuf);
 733                                         (void) close(fd);
 734                                 } else {
 735                                         err = stat64(path, &statbuf);
 736                                 }
 737
 738                                 if (err != 0 ||
 739                                     statbuf.st_size == 0 ||
 740                                     statbuf.st_size == MAXOFFSET_T)
 741                                         continue;
 742
 743                                 size = statbuf.st_size;
 744
 745                                 /*
 746                                  * Also make sure that devices and
 747                                  * slices have a consistent size.  If
 748                                  * they differ by a significant amount
 749                                  * (~16MB) then report an error.
 750                                  */
 751                                 if (!dontreport &&
 752                                     (vdev_size != -1ULL &&
 753                                     (labs(size - vdev_size) >
 754                                     ZPOOL_FUZZ))) {
 755                                         if (ret != NULL)
 756                                                 free(ret);
 757                                         ret = NULL;
 758                                         if (fatal)
 759                                                 vdev_error(gettext(
 760                                                     "%s contains devices of "
 761                                                     "different sizes\n"),
 762                                                     rep.zprl_type);
 763                                         else
 764                                                 return (NULL);
 765                                         dontreport = B_TRUE;
 766                                 }
 767
 768                                 type = childtype;
 769                                 vdev_size = size;
 770                         }
 771                 }
 772
 773                 /*
 774                  * At this point, we have the replication of the last toplevel
 775                  * vdev in 'rep'.  Compare it to 'lastrep' to see if its
 776                  * different.
 777                  */
 778                 if (lastrep.zprl_type != NULL) {
 779                         if (strcmp(lastrep.zprl_type, rep.zprl_type) != 0) {
 780                                 if (ret != NULL)
 781                                         free(ret);
 782                                 ret = NULL;
 783                                 if (fatal)
 784                                         vdev_error(gettext(
 785                                             "mismatched replication level: "
 786                                             "both %s and %s vdevs are "
 787                                             "present\n"),
 788                                             lastrep.zprl_type, rep.zprl_type);
 789                                 else
 790                                         return (NULL);
 791                         } else if (lastrep.zprl_parity != rep.zprl_parity) {
 792                                 if (ret)
 793                                         free(ret);
 794                                 ret = NULL;
 795                                 if (fatal)
 796                                         vdev_error(gettext(
 797                                             "mismatched replication level: "
 798                                             "both %llu and %llu device parity "
 799                                             "%s vdevs are present\n"),
 800                                             lastrep.zprl_parity,
 801                                             rep.zprl_parity,
 802                                             rep.zprl_type);
 803                                 else
 804                                         return (NULL);
 805                         } else if (lastrep.zprl_children != rep.zprl_children) {
 806                                 if (ret)
 807                                         free(ret);
 808                                 ret = NULL;
 809                                 if (fatal)
 810                                         vdev_error(gettext(
 811                                             "mismatched replication level: "
 812                                             "both %llu-way and %llu-way %s "
 813                                             "vdevs are present\n"),
 814                                             lastrep.zprl_children,
 815                                             rep.zprl_children,
 816                                             rep.zprl_type);
 817                                 else
 818                                         return (NULL);
 819                         }
 820                 }
 821                 lastrep = rep;
 822         }
 823
 824         if (ret != NULL)
 825                 *ret = rep;
 826
 827         return (ret);
 828 }
 829
 830 /*
 831  * Check the replication level of the vdev spec against the current pool.  Calls
 832  * get_replication() to make sure the new spec is self-consistent.  If the pool
 833  * has a consistent replication level, then we ignore any errors.  Otherwise,
 834  * report any difference between the two.
 835  */
 836 static int
 837 check_replication(nvlist_t *config, nvlist_t *newroot)
 838 {
 839         nvlist_t **child;
 840         uint_t  children;
 841         replication_level_t *current = NULL, *new;
 842         int ret;
 843
 844         /*
 845          * If we have a current pool configuration, check to see if it's
 846          * self-consistent.  If not, simply return success.
 847          */
 848         if (config != NULL) {
 849                 nvlist_t *nvroot;
 850
 851                 verify(nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE,
 852                     &nvroot) == 0);
 853                 if ((current = get_replication(nvroot, B_FALSE)) == NULL)
 854                         return (0);
 855         }
 856         /*
 857          * for spares there may be no children, and therefore no
 858          * replication level to check
 859          */
 860         if ((nvlist_lookup_nvlist_array(newroot, ZPOOL_CONFIG_CHILDREN,
 861             &child, &children) != 0) || (children == 0)) {
 862                 free(current);
 863                 return (0);
 864         }
 865
 866         /*
 867          * If all we have is logs then there's no replication level to check.
 868          */
 869         if (num_logs(newroot) == children) {
 870                 free(current);
 871                 return (0);
 872         }
 873
 874         /*
 875          * Get the replication level of the new vdev spec, reporting any
 876          * inconsistencies found.
 877          */
 878         if ((new = get_replication(newroot, B_TRUE)) == NULL) {
 879                 free(current);
 880                 return (-1);
 881         }
 882
 883         /*
 884          * Check to see if the new vdev spec matches the replication level of
 885          * the current pool.
 886          */
 887         ret = 0;
 888         if (current != NULL) {
 889                 if (strcmp(current->zprl_type, new->zprl_type) != 0) {
 890                         vdev_error(gettext(
 891                             "mismatched replication level: pool uses %s "
 892                             "and new vdev is %s\n"),
 893                             current->zprl_type, new->zprl_type);
 894                         ret = -1;
 895                 } else if (current->zprl_parity != new->zprl_parity) {
 896                         vdev_error(gettext(
 897                             "mismatched replication level: pool uses %llu "
 898                             "device parity and new vdev uses %llu\n"),
 899                             current->zprl_parity, new->zprl_parity);
 900                         ret = -1;
 901                 } else if (current->zprl_children != new->zprl_children) {
 902                         vdev_error(gettext(
 903                             "mismatched replication level: pool uses %llu-way "
 904                             "%s and new vdev uses %llu-way %s\n"),
 905                             current->zprl_children, current->zprl_type,
 906                             new->zprl_children, new->zprl_type);
 907                         ret = -1;
 908                 }
 909         }
 910
 911         free(new);
 912         if (current != NULL)
 913                 free(current);
 914
 915         return (ret);
 916 }
 917
 918 #ifdef illumos
 919 /*
 920  * Go through and find any whole disks in the vdev specification, labelling them
 921  * as appropriate.  When constructing the vdev spec, we were unable to open this
 922  * device in order to provide a devid.  Now that we have labelled the disk and
 923  * know that slice 0 is valid, we can construct the devid now.
 924  *
 925  * If the disk was already labeled with an EFI label, we will have gotten the
 926  * devid already (because we were able to open the whole disk).  Otherwise, we
 927  * need to get the devid after we label the disk.
 928  */
 929 static int
 930 make_disks(zpool_handle_t *zhp, nvlist_t *nv)
 931 {
 932         nvlist_t **child;
 933         uint_t c, children;
 934         char *type, *path, *diskname;
 935         char buf[MAXPATHLEN];
 936         uint64_t wholedisk;
 937         int fd;
 938         int ret;
 939         ddi_devid_t devid;
 940         char *minor = NULL, *devid_str = NULL;
 941
 942         verify(nvlist_lookup_string(nv, ZPOOL_CONFIG_TYPE, &type) == 0);
 943
 944         if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_CHILDREN,
 945             &child, &children) != 0) {
 946
 947                 if (strcmp(type, VDEV_TYPE_DISK) != 0)
 948                         return (0);
 949
 950                 /*
 951                  * We have a disk device.  Get the path to the device
 952                  * and see if it's a whole disk by appending the backup
 953                  * slice and stat()ing the device.
 954                  */
 955                 verify(nvlist_lookup_string(nv, ZPOOL_CONFIG_PATH, &path) == 0);
 956                 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_WHOLE_DISK,
 957                     &wholedisk) != 0 || !wholedisk)
 958                         return (0);
 959
 960                 diskname = strrchr(path, '/');
 961                 assert(diskname != NULL);
 962                 diskname++;
 963                 if (zpool_label_disk(g_zfs, zhp, diskname) == -1)
 964                         return (-1);
 965
 966                 /*
 967                  * Fill in the devid, now that we've labeled the disk.
 968                  */
 969                 (void) snprintf(buf, sizeof (buf), "%ss0", path);
 970                 if ((fd = open(buf, O_RDONLY)) < 0) {
 971                         (void) fprintf(stderr,
 972                             gettext("cannot open '%s': %s\n"),
 973                             buf, strerror(errno));
 974                         return (-1);
 975                 }
 976
 977                 if (devid_get(fd, &devid) == 0) {
 978                         if (devid_get_minor_name(fd, &minor) == 0 &&
 979                             (devid_str = devid_str_encode(devid, minor)) !=
 980                             NULL) {
 981                                 verify(nvlist_add_string(nv,
 982                                     ZPOOL_CONFIG_DEVID, devid_str) == 0);
 983                         }
 984                         if (devid_str != NULL)
 985                                 devid_str_free(devid_str);
 986                         if (minor != NULL)
 987                                 devid_str_free(minor);
 988                         devid_free(devid);
 989                 }
 990
 991                 /*
 992                  * Update the path to refer to the 's0' slice.  The presence of
 993                  * the 'whole_disk' field indicates to the CLI that we should
 994                  * chop off the slice number when displaying the device in
 995                  * future output.
 996                  */
 997                 verify(nvlist_add_string(nv, ZPOOL_CONFIG_PATH, buf) == 0);
 998
 999                 (void) close(fd);
1000
1001                 return (0);
1002         }
1003
1004         for (c = 0; c < children; c++)
1005                 if ((ret = make_disks(zhp, child[c])) != 0)
1006                         return (ret);
1007
1008         if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_SPARES,
1009             &child, &children) == 0)
1010                 for (c = 0; c < children; c++)
1011                         if ((ret = make_disks(zhp, child[c])) != 0)
1012                                 return (ret);
1013
1014         if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_L2CACHE,
1015             &child, &children) == 0)
1016                 for (c = 0; c < children; c++)
1017                         if ((ret = make_disks(zhp, child[c])) != 0)
1018                                 return (ret);
1019
1020         return (0);
1021 }
1022 #endif  /* illumos */
1023
1024 /*
1025  * Determine if the given path is a hot spare within the given configuration.
1026  */
1027 static boolean_t
1028 is_spare(nvlist_t *config, const char *path)
1029 {
1030         int fd;
1031         pool_state_t state;
1032         char *name = NULL;
1033         nvlist_t *label;
1034         uint64_t guid, spareguid;
1035         nvlist_t *nvroot;
1036         nvlist_t **spares;
1037         uint_t i, nspares;
1038         boolean_t inuse;
1039
1040         if ((fd = open(path, O_RDONLY)) < 0)
1041                 return (B_FALSE);
1042
1043         if (zpool_in_use(g_zfs, fd, &state, &name, &inuse) != 0 ||
1044             !inuse ||
1045             state != POOL_STATE_SPARE ||
1046             zpool_read_label(fd, &label) != 0) {
1047                 free(name);
1048                 (void) close(fd);
1049                 return (B_FALSE);
1050         }
1051         free(name);
1052         (void) close(fd);
1053
1054         verify(nvlist_lookup_uint64(label, ZPOOL_CONFIG_GUID, &guid) == 0);
1055         nvlist_free(label);
1056
1057         verify(nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE,
1058             &nvroot) == 0);
1059         if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_SPARES,
1060             &spares, &nspares) == 0) {
1061                 for (i = 0; i < nspares; i++) {
1062                         verify(nvlist_lookup_uint64(spares[i],
1063                             ZPOOL_CONFIG_GUID, &spareguid) == 0);
1064                         if (spareguid == guid)
1065                                 return (B_TRUE);
1066                 }
1067         }
1068
1069         return (B_FALSE);
1070 }
1071
1072 /*
1073  * Go through and find any devices that are in use.  We rely on libdiskmgt for
1074  * the majority of this task.
1075  */
1076 static boolean_t
1077 is_device_in_use(nvlist_t *config, nvlist_t *nv, boolean_t force,
1078     boolean_t replacing, boolean_t isspare)
1079 {
1080         nvlist_t **child;
1081         uint_t c, children;
1082         char *type, *path;
1083         int ret = 0;
1084         char buf[MAXPATHLEN];
1085         uint64_t wholedisk;
1086         boolean_t anyinuse = B_FALSE;
1087
1088         verify(nvlist_lookup_string(nv, ZPOOL_CONFIG_TYPE, &type) == 0);
1089
1090         if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_CHILDREN,
1091             &child, &children) != 0) {
1092
1093                 verify(nvlist_lookup_string(nv, ZPOOL_CONFIG_PATH, &path) == 0);
1094
1095                 /*
1096                  * As a generic check, we look to see if this is a replace of a
1097                  * hot spare within the same pool.  If so, we allow it
1098                  * regardless of what libdiskmgt or zpool_in_use() says.
1099                  */
1100                 if (replacing) {
1101 #ifdef illumos
1102                         if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_WHOLE_DISK,
1103                             &wholedisk) == 0 && wholedisk)
1104                                 (void) snprintf(buf, sizeof (buf), "%ss0",
1105                                     path);
1106                         else
1107 #endif
1108                                 (void) strlcpy(buf, path, sizeof (buf));
1109
1110                         if (is_spare(config, buf))
1111                                 return (B_FALSE);
1112                 }
1113
1114                 if (strcmp(type, VDEV_TYPE_DISK) == 0)
1115                         ret = check_device(path, force, isspare);
1116                 else if (strcmp(type, VDEV_TYPE_FILE) == 0)
1117                         ret = check_file(path, force, isspare);
1118
1119                 return (ret != 0);
1120         }
1121
1122         for (c = 0; c < children; c++)
1123                 if (is_device_in_use(config, child[c], force, replacing,
1124                     B_FALSE))
1125                         anyinuse = B_TRUE;
1126
1127         if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_SPARES,
1128             &child, &children) == 0)
1129                 for (c = 0; c < children; c++)
1130                         if (is_device_in_use(config, child[c], force, replacing,
1131                             B_TRUE))
1132                                 anyinuse = B_TRUE;
1133
1134         if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_L2CACHE,
1135             &child, &children) == 0)
1136                 for (c = 0; c < children; c++)
1137                         if (is_device_in_use(config, child[c], force, replacing,
1138                             B_FALSE))
1139                                 anyinuse = B_TRUE;
1140
1141         return (anyinuse);
1142 }
1143
1144 static const char *
1145 is_grouping(const char *type, int *mindev, int *maxdev)
1146 {
1147         if (strncmp(type, "raidz", 5) == 0) {
1148                 const char *p = type + 5;
1149                 char *end;
1150                 long nparity;
1151
1152                 if (*p == '\0') {
1153                         nparity = 1;
1154                 } else if (*p == '0') {
1155                         return (NULL); /* no zero prefixes allowed */
1156                 } else {
1157                         errno = 0;
1158                         nparity = strtol(p, &end, 10);
1159                         if (errno != 0 || nparity < 1 || nparity >= 255 ||
1160                             *end != '\0')
1161                                 return (NULL);
1162                 }
1163
1164                 if (mindev != NULL)
1165                         *mindev = nparity + 1;
1166                 if (maxdev != NULL)
1167                         *maxdev = 255;
1168                 return (VDEV_TYPE_RAIDZ);
1169         }
1170
1171         if (maxdev != NULL)
1172                 *maxdev = INT_MAX;
1173
1174         if (strcmp(type, "mirror") == 0) {
1175                 if (mindev != NULL)
1176                         *mindev = 2;
1177                 return (VDEV_TYPE_MIRROR);
1178         }
1179
1180         if (strcmp(type, "spare") == 0) {
1181                 if (mindev != NULL)
1182                         *mindev = 1;
1183                 return (VDEV_TYPE_SPARE);
1184         }
1185
1186         if (strcmp(type, "log") == 0) {
1187                 if (mindev != NULL)
1188                         *mindev = 1;
1189                 return (VDEV_TYPE_LOG);
1190         }
1191
1192         if (strcmp(type, "cache") == 0) {
1193                 if (mindev != NULL)
1194                         *mindev = 1;
1195                 return (VDEV_TYPE_L2CACHE);
1196         }
1197
1198         return (NULL);
1199 }
1200
1201 /*
1202  * Construct a syntactically valid vdev specification,
1203  * and ensure that all devices and files exist and can be opened.
1204  * Note: we don't bother freeing anything in the error paths
1205  * because the program is just going to exit anyway.
1206  */
1207 nvlist_t *
1208 construct_spec(int argc, char **argv)
1209 {
1210         nvlist_t *nvroot, *nv, **top, **spares, **l2cache;
1211         int t, toplevels, mindev, maxdev, nspares, nlogs, nl2cache;
1212         const char *type;
1213         uint64_t is_log;
1214         boolean_t seen_logs;
1215
1216         top = NULL;
1217         toplevels = 0;
1218         spares = NULL;
1219         l2cache = NULL;
1220         nspares = 0;
1221         nlogs = 0;
1222         nl2cache = 0;
1223         is_log = B_FALSE;
1224         seen_logs = B_FALSE;
1225
1226         while (argc > 0) {
1227                 nv = NULL;
1228
1229                 /*
1230                  * If it's a mirror or raidz, the subsequent arguments are
1231                  * its leaves -- until we encounter the next mirror or raidz.
1232                  */
1233                 if ((type = is_grouping(argv[0], &mindev, &maxdev)) != NULL) {
1234                         nvlist_t **child = NULL;
1235                         int c, children = 0;
1236
1237                         if (strcmp(type, VDEV_TYPE_SPARE) == 0) {
1238                                 if (spares != NULL) {
1239                                         (void) fprintf(stderr,
1240                                             gettext("invalid vdev "
1241                                             "specification: 'spare' can be "
1242                                             "specified only once\n"));
1243                                         return (NULL);
1244                                 }
1245                                 is_log = B_FALSE;
1246                         }
1247
1248                         if (strcmp(type, VDEV_TYPE_LOG) == 0) {
1249                                 if (seen_logs) {
1250                                         (void) fprintf(stderr,
1251                                             gettext("invalid vdev "
1252                                             "specification: 'log' can be "
1253                                             "specified only once\n"));
1254                                         return (NULL);
1255                                 }
1256                                 seen_logs = B_TRUE;
1257                                 is_log = B_TRUE;
1258                                 argc--;
1259                                 argv++;
1260                                 /*
1261                                  * A log is not a real grouping device.
1262                                  * We just set is_log and continue.
1263                                  */
1264                                 continue;
1265                         }
1266
1267                         if (strcmp(type, VDEV_TYPE_L2CACHE) == 0) {
1268                                 if (l2cache != NULL) {
1269                                         (void) fprintf(stderr,
1270                                             gettext("invalid vdev "
1271                                             "specification: 'cache' can be "
1272                                             "specified only once\n"));
1273                                         return (NULL);
1274                                 }
1275                                 is_log = B_FALSE;
1276                         }
1277
1278                         if (is_log) {
1279                                 if (strcmp(type, VDEV_TYPE_MIRROR) != 0) {
1280                                         (void) fprintf(stderr,
1281                                             gettext("invalid vdev "
1282                                             "specification: unsupported 'log' "
1283                                             "device: %s\n"), type);
1284                                         return (NULL);
1285                                 }
1286                                 nlogs++;
1287                         }
1288
1289                         for (c = 1; c < argc; c++) {
1290                                 if (is_grouping(argv[c], NULL, NULL) != NULL)
1291                                         break;
1292                                 children++;
1293                                 child = realloc(child,
1294                                     children * sizeof (nvlist_t *));
1295                                 if (child == NULL)
1296                                         zpool_no_memory();
1297                                 if ((nv = make_leaf_vdev(argv[c], B_FALSE))
1298                                     == NULL)
1299                                         return (NULL);
1300                                 child[children - 1] = nv;
1301                         }
1302
1303                         if (children < mindev) {
1304                                 (void) fprintf(stderr, gettext("invalid vdev "
1305                                     "specification: %s requires at least %d "
1306                                     "devices\n"), argv[0], mindev);
1307                                 return (NULL);
1308                         }
1309
1310                         if (children > maxdev) {
1311                                 (void) fprintf(stderr, gettext("invalid vdev "
1312                                     "specification: %s supports no more than "
1313                                     "%d devices\n"), argv[0], maxdev);
1314                                 return (NULL);
1315                         }
1316
1317                         argc -= c;
1318                         argv += c;
1319
1320                         if (strcmp(type, VDEV_TYPE_SPARE) == 0) {
1321                                 spares = child;
1322                                 nspares = children;
1323                                 continue;
1324                         } else if (strcmp(type, VDEV_TYPE_L2CACHE) == 0) {
1325                                 l2cache = child;
1326                                 nl2cache = children;
1327                                 continue;
1328                         } else {
1329                                 verify(nvlist_alloc(&nv, NV_UNIQUE_NAME,
1330                                     0) == 0);
1331                                 verify(nvlist_add_string(nv, ZPOOL_CONFIG_TYPE,
1332                                     type) == 0);
1333                                 verify(nvlist_add_uint64(nv,
1334                                     ZPOOL_CONFIG_IS_LOG, is_log) == 0);
1335                                 if (strcmp(type, VDEV_TYPE_RAIDZ) == 0) {
1336                                         verify(nvlist_add_uint64(nv,
1337                                             ZPOOL_CONFIG_NPARITY,
1338                                             mindev - 1) == 0);
1339                                 }
1340                                 verify(nvlist_add_nvlist_array(nv,
1341                                     ZPOOL_CONFIG_CHILDREN, child,
1342                                     children) == 0);
1343
1344                                 for (c = 0; c < children; c++)
1345                                         nvlist_free(child[c]);
1346                                 free(child);
1347                         }
1348                 } else {
1349                         /*
1350                          * We have a device.  Pass off to make_leaf_vdev() to
1351                          * construct the appropriate nvlist describing the vdev.
1352                          */
1353                         if ((nv = make_leaf_vdev(argv[0], is_log)) == NULL)
1354                                 return (NULL);
1355                         if (is_log)
1356                                 nlogs++;
1357                         argc--;
1358                         argv++;
1359                 }
1360
1361                 toplevels++;
1362                 top = realloc(top, toplevels * sizeof (nvlist_t *));
1363                 if (top == NULL)
1364                         zpool_no_memory();
1365                 top[toplevels - 1] = nv;
1366         }
1367
1368         if (toplevels == 0 && nspares == 0 && nl2cache == 0) {
1369                 (void) fprintf(stderr, gettext("invalid vdev "
1370                     "specification: at least one toplevel vdev must be "
1371                     "specified\n"));
1372                 return (NULL);
1373         }
1374
1375         if (seen_logs && nlogs == 0) {
1376                 (void) fprintf(stderr, gettext("invalid vdev specification: "
1377                     "log requires at least 1 device\n"));
1378                 return (NULL);
1379         }
1380
1381         /*
1382          * Finally, create nvroot and add all top-level vdevs to it.
1383          */
1384         verify(nvlist_alloc(&nvroot, NV_UNIQUE_NAME, 0) == 0);
1385         verify(nvlist_add_string(nvroot, ZPOOL_CONFIG_TYPE,
1386             VDEV_TYPE_ROOT) == 0);
1387         verify(nvlist_add_nvlist_array(nvroot, ZPOOL_CONFIG_CHILDREN,
1388             top, toplevels) == 0);
1389         if (nspares != 0)
1390                 verify(nvlist_add_nvlist_array(nvroot, ZPOOL_CONFIG_SPARES,
1391                     spares, nspares) == 0);
1392         if (nl2cache != 0)
1393                 verify(nvlist_add_nvlist_array(nvroot, ZPOOL_CONFIG_L2CACHE,
1394                     l2cache, nl2cache) == 0);
1395
1396         for (t = 0; t < toplevels; t++)
1397                 nvlist_free(top[t]);
1398         for (t = 0; t < nspares; t++)
1399                 nvlist_free(spares[t]);
1400         for (t = 0; t < nl2cache; t++)
1401                 nvlist_free(l2cache[t]);
1402         if (spares)
1403                 free(spares);
1404         if (l2cache)
1405                 free(l2cache);
1406         free(top);
1407
1408         return (nvroot);
1409 }
1410
1411 nvlist_t *
1412 split_mirror_vdev(zpool_handle_t *zhp, char *newname, nvlist_t *props,
1413     splitflags_t flags, int argc, char **argv)
1414 {
1415         nvlist_t *newroot = NULL, **child;
1416         uint_t c, children;
1417
1418         if (argc > 0) {
1419                 if ((newroot = construct_spec(argc, argv)) == NULL) {
1420                         (void) fprintf(stderr, gettext("Unable to build a "
1421                             "pool from the specified devices\n"));
1422                         return (NULL);
1423                 }
1424
1425 #ifdef illumos
1426                 if (!flags.dryrun && make_disks(zhp, newroot) != 0) {
1427                         nvlist_free(newroot);
1428                         return (NULL);
1429                 }
1430 #endif
1431
1432                 /* avoid any tricks in the spec */
1433                 verify(nvlist_lookup_nvlist_array(newroot,
1434                     ZPOOL_CONFIG_CHILDREN, &child, &children) == 0);
1435                 for (c = 0; c < children; c++) {
1436                         char *path;
1437                         const char *type;
1438                         int min, max;
1439
1440                         verify(nvlist_lookup_string(child[c],
1441                             ZPOOL_CONFIG_PATH, &path) == 0);
1442                         if ((type = is_grouping(path, &min, &max)) != NULL) {
1443                                 (void) fprintf(stderr, gettext("Cannot use "
1444                                     "'%s' as a device for splitting\n"), type);
1445                                 nvlist_free(newroot);
1446                                 return (NULL);
1447                         }
1448                 }
1449         }
1450
1451         if (zpool_vdev_split(zhp, newname, &newroot, props, flags) != 0) {
1452                 nvlist_free(newroot);
1453                 return (NULL);
1454         }
1455
1456         return (newroot);
1457 }
1458
1459 /*
1460  * Get and validate the contents of the given vdev specification.  This ensures
1461  * that the nvlist returned is well-formed, that all the devices exist, and that
1462  * they are not currently in use by any other known consumer.  The 'poolconfig'
1463  * parameter is the current configuration of the pool when adding devices
1464  * existing pool, and is used to perform additional checks, such as changing the
1465  * replication level of the pool.  It can be 'NULL' to indicate that this is a
1466  * new pool.  The 'force' flag controls whether devices should be forcefully
1467  * added, even if they appear in use.
1468  */
1469 nvlist_t *
1470 make_root_vdev(zpool_handle_t *zhp, int force, int check_rep,
1471     boolean_t replacing, boolean_t dryrun, int argc, char **argv)
1472 {
1473         nvlist_t *newroot;
1474         nvlist_t *poolconfig = NULL;
1475         is_force = force;
1476
1477         /*
1478          * Construct the vdev specification.  If this is successful, we know
1479          * that we have a valid specification, and that all devices can be
1480          * opened.
1481          */
1482         if ((newroot = construct_spec(argc, argv)) == NULL)
1483                 return (NULL);
1484
1485         if (zhp && ((poolconfig = zpool_get_config(zhp, NULL)) == NULL))
1486                 return (NULL);
1487
1488         /*
1489          * Validate each device to make sure that its not shared with another
1490          * subsystem.  We do this even if 'force' is set, because there are some
1491          * uses (such as a dedicated dump device) that even '-f' cannot
1492          * override.
1493          */
1494         if (is_device_in_use(poolconfig, newroot, force, replacing, B_FALSE)) {
1495                 nvlist_free(newroot);
1496                 return (NULL);
1497         }
1498
1499         /*
1500          * Check the replication level of the given vdevs and report any errors
1501          * found.  We include the existing pool spec, if any, as we need to
1502          * catch changes against the existing replication level.
1503          */
1504         if (check_rep && check_replication(poolconfig, newroot) != 0) {
1505                 nvlist_free(newroot);
1506                 return (NULL);
1507         }
1508
1509 #ifdef illumos
1510         /*
1511          * Run through the vdev specification and label any whole disks found.
1512          */
1513         if (!dryrun && make_disks(zhp, newroot) != 0) {
1514                 nvlist_free(newroot);
1515                 return (NULL);
1516         }
1517 #endif
1518
1519         return (newroot);
1520 }