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-rw-r--r--cmd/zpool/zpool_vdev.c1581
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diff --git a/cmd/zpool/zpool_vdev.c b/cmd/zpool/zpool_vdev.c
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+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License (the "License").
+ * You may not use this file except in compliance with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+
+/*
+ * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2013, 2018 by Delphix. All rights reserved.
+ * Copyright (c) 2016, 2017 Intel Corporation.
+ * Copyright 2016 Igor Kozhukhov <ikozhukhov@gmail.com>.
+ */
+
+/*
+ * Functions to convert between a list of vdevs and an nvlist representing the
+ * configuration. Each entry in the list can be one of:
+ *
+ * Device vdevs
+ * disk=(path=..., devid=...)
+ * file=(path=...)
+ *
+ * Group vdevs
+ * raidz[1|2]=(...)
+ * mirror=(...)
+ *
+ * Hot spares
+ *
+ * While the underlying implementation supports it, group vdevs cannot contain
+ * other group vdevs. All userland verification of devices is contained within
+ * this file. If successful, the nvlist returned can be passed directly to the
+ * kernel; we've done as much verification as possible in userland.
+ *
+ * Hot spares are a special case, and passed down as an array of disk vdevs, at
+ * the same level as the root of the vdev tree.
+ *
+ * The only function exported by this file is 'make_root_vdev'. The
+ * function performs several passes:
+ *
+ * 1. Construct the vdev specification. Performs syntax validation and
+ * makes sure each device is valid.
+ * 2. Check for devices in use. Using libblkid to make sure that no
+ * devices are also in use. Some can be overridden using the 'force'
+ * flag, others cannot.
+ * 3. Check for replication errors if the 'force' flag is not specified.
+ * validates that the replication level is consistent across the
+ * entire pool.
+ * 4. Call libzfs to label any whole disks with an EFI label.
+ */
+
+#include <assert.h>
+#include <ctype.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <libintl.h>
+#include <libnvpair.h>
+#include <libzutil.h>
+#include <limits.h>
+#include <sys/spa.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#include "zpool_util.h"
+#include <sys/zfs_context.h>
+#include <sys/stat.h>
+
+/*
+ * For any given vdev specification, we can have multiple errors. The
+ * vdev_error() function keeps track of whether we have seen an error yet, and
+ * prints out a header if its the first error we've seen.
+ */
+boolean_t error_seen;
+boolean_t is_force;
+
+
+
+
+/*PRINTFLIKE1*/
+void
+vdev_error(const char *fmt, ...)
+{
+ va_list ap;
+
+ if (!error_seen) {
+ (void) fprintf(stderr, gettext("invalid vdev specification\n"));
+ if (!is_force)
+ (void) fprintf(stderr, gettext("use '-f' to override "
+ "the following errors:\n"));
+ else
+ (void) fprintf(stderr, gettext("the following errors "
+ "must be manually repaired:\n"));
+ error_seen = B_TRUE;
+ }
+
+ va_start(ap, fmt);
+ (void) vfprintf(stderr, fmt, ap);
+ va_end(ap);
+}
+
+/*
+ * Check that a file is valid. All we can do in this case is check that it's
+ * not in use by another pool, and not in use by swap.
+ */
+int
+check_file(const char *file, boolean_t force, boolean_t isspare)
+{
+ char *name;
+ int fd;
+ int ret = 0;
+ pool_state_t state;
+ boolean_t inuse;
+
+ if ((fd = open(file, O_RDONLY)) < 0)
+ return (0);
+
+ if (zpool_in_use(g_zfs, fd, &state, &name, &inuse) == 0 && inuse) {
+ const char *desc;
+
+ switch (state) {
+ case POOL_STATE_ACTIVE:
+ desc = gettext("active");
+ break;
+
+ case POOL_STATE_EXPORTED:
+ desc = gettext("exported");
+ break;
+
+ case POOL_STATE_POTENTIALLY_ACTIVE:
+ desc = gettext("potentially active");
+ break;
+
+ default:
+ desc = gettext("unknown");
+ break;
+ }
+
+ /*
+ * Allow hot spares to be shared between pools.
+ */
+ if (state == POOL_STATE_SPARE && isspare) {
+ free(name);
+ (void) close(fd);
+ return (0);
+ }
+
+ if (state == POOL_STATE_ACTIVE ||
+ state == POOL_STATE_SPARE || !force) {
+ switch (state) {
+ case POOL_STATE_SPARE:
+ vdev_error(gettext("%s is reserved as a hot "
+ "spare for pool %s\n"), file, name);
+ break;
+ default:
+ vdev_error(gettext("%s is part of %s pool "
+ "'%s'\n"), file, desc, name);
+ break;
+ }
+ ret = -1;
+ }
+
+ free(name);
+ }
+
+ (void) close(fd);
+ return (ret);
+}
+
+/*
+ * This may be a shorthand device path or it could be total gibberish.
+ * Check to see if it is a known device available in zfs_vdev_paths.
+ * As part of this check, see if we've been given an entire disk
+ * (minus the slice number).
+ */
+static int
+is_shorthand_path(const char *arg, char *path, size_t path_size,
+ struct stat64 *statbuf, boolean_t *wholedisk)
+{
+ int error;
+
+ error = zfs_resolve_shortname(arg, path, path_size);
+ if (error == 0) {
+ *wholedisk = zfs_dev_is_whole_disk(path);
+ if (*wholedisk || (stat64(path, statbuf) == 0))
+ return (0);
+ }
+
+ strlcpy(path, arg, path_size);
+ memset(statbuf, 0, sizeof (*statbuf));
+ *wholedisk = B_FALSE;
+
+ return (error);
+}
+
+/*
+ * Determine if the given path is a hot spare within the given configuration.
+ * If no configuration is given we rely solely on the label.
+ */
+static boolean_t
+is_spare(nvlist_t *config, const char *path)
+{
+ int fd;
+ pool_state_t state;
+ char *name = NULL;
+ nvlist_t *label;
+ uint64_t guid, spareguid;
+ nvlist_t *nvroot;
+ nvlist_t **spares;
+ uint_t i, nspares;
+ boolean_t inuse;
+
+ if ((fd = open(path, O_RDONLY|O_DIRECT)) < 0)
+ return (B_FALSE);
+
+ if (zpool_in_use(g_zfs, fd, &state, &name, &inuse) != 0 ||
+ !inuse ||
+ state != POOL_STATE_SPARE ||
+ zpool_read_label(fd, &label, NULL) != 0) {
+ free(name);
+ (void) close(fd);
+ return (B_FALSE);
+ }
+ free(name);
+ (void) close(fd);
+
+ if (config == NULL) {
+ nvlist_free(label);
+ return (B_TRUE);
+ }
+
+ verify(nvlist_lookup_uint64(label, ZPOOL_CONFIG_GUID, &guid) == 0);
+ nvlist_free(label);
+
+ verify(nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE,
+ &nvroot) == 0);
+ if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_SPARES,
+ &spares, &nspares) == 0) {
+ for (i = 0; i < nspares; i++) {
+ verify(nvlist_lookup_uint64(spares[i],
+ ZPOOL_CONFIG_GUID, &spareguid) == 0);
+ if (spareguid == guid)
+ return (B_TRUE);
+ }
+ }
+
+ return (B_FALSE);
+}
+
+/*
+ * Create a leaf vdev. Determine if this is a file or a device. If it's a
+ * device, fill in the device id to make a complete nvlist. Valid forms for a
+ * leaf vdev are:
+ *
+ * /dev/xxx Complete disk path
+ * /xxx Full path to file
+ * xxx Shorthand for <zfs_vdev_paths>/xxx
+ */
+static nvlist_t *
+make_leaf_vdev(nvlist_t *props, const char *arg, uint64_t is_log)
+{
+ char path[MAXPATHLEN];
+ struct stat64 statbuf;
+ nvlist_t *vdev = NULL;
+ char *type = NULL;
+ boolean_t wholedisk = B_FALSE;
+ uint64_t ashift = 0;
+ int err;
+
+ /*
+ * Determine what type of vdev this is, and put the full path into
+ * 'path'. We detect whether this is a device of file afterwards by
+ * checking the st_mode of the file.
+ */
+ if (arg[0] == '/') {
+ /*
+ * Complete device or file path. Exact type is determined by
+ * examining the file descriptor afterwards. Symbolic links
+ * are resolved to their real paths to determine whole disk
+ * and S_ISBLK/S_ISREG type checks. However, we are careful
+ * to store the given path as ZPOOL_CONFIG_PATH to ensure we
+ * can leverage udev's persistent device labels.
+ */
+ if (realpath(arg, path) == NULL) {
+ (void) fprintf(stderr,
+ gettext("cannot resolve path '%s'\n"), arg);
+ return (NULL);
+ }
+
+ wholedisk = zfs_dev_is_whole_disk(path);
+ if (!wholedisk && (stat64(path, &statbuf) != 0)) {
+ (void) fprintf(stderr,
+ gettext("cannot open '%s': %s\n"),
+ path, strerror(errno));
+ return (NULL);
+ }
+
+ /* After whole disk check restore original passed path */
+ strlcpy(path, arg, sizeof (path));
+ } else {
+ err = is_shorthand_path(arg, path, sizeof (path),
+ &statbuf, &wholedisk);
+ if (err != 0) {
+ /*
+ * If we got ENOENT, then the user gave us
+ * gibberish, so try to direct them with a
+ * reasonable error message. Otherwise,
+ * regurgitate strerror() since it's the best we
+ * can do.
+ */
+ if (err == ENOENT) {
+ (void) fprintf(stderr,
+ gettext("cannot open '%s': no such "
+ "device in %s\n"), arg, DISK_ROOT);
+ (void) fprintf(stderr,
+ gettext("must be a full path or "
+ "shorthand device name\n"));
+ return (NULL);
+ } else {
+ (void) fprintf(stderr,
+ gettext("cannot open '%s': %s\n"),
+ path, strerror(errno));
+ return (NULL);
+ }
+ }
+ }
+
+ /*
+ * Determine whether this is a device or a file.
+ */
+ if (wholedisk || S_ISBLK(statbuf.st_mode)) {
+ type = VDEV_TYPE_DISK;
+ } else if (S_ISREG(statbuf.st_mode)) {
+ type = VDEV_TYPE_FILE;
+ } else {
+ (void) fprintf(stderr, gettext("cannot use '%s': must be a "
+ "block device or regular file\n"), path);
+ return (NULL);
+ }
+
+ /*
+ * Finally, we have the complete device or file, and we know that it is
+ * acceptable to use. Construct the nvlist to describe this vdev. All
+ * vdevs have a 'path' element, and devices also have a 'devid' element.
+ */
+ verify(nvlist_alloc(&vdev, NV_UNIQUE_NAME, 0) == 0);
+ verify(nvlist_add_string(vdev, ZPOOL_CONFIG_PATH, path) == 0);
+ verify(nvlist_add_string(vdev, ZPOOL_CONFIG_TYPE, type) == 0);
+ verify(nvlist_add_uint64(vdev, ZPOOL_CONFIG_IS_LOG, is_log) == 0);
+ if (is_log)
+ verify(nvlist_add_string(vdev, ZPOOL_CONFIG_ALLOCATION_BIAS,
+ VDEV_ALLOC_BIAS_LOG) == 0);
+ if (strcmp(type, VDEV_TYPE_DISK) == 0)
+ verify(nvlist_add_uint64(vdev, ZPOOL_CONFIG_WHOLE_DISK,
+ (uint64_t)wholedisk) == 0);
+
+ /*
+ * Override defaults if custom properties are provided.
+ */
+ if (props != NULL) {
+ char *value = NULL;
+
+ if (nvlist_lookup_string(props,
+ zpool_prop_to_name(ZPOOL_PROP_ASHIFT), &value) == 0) {
+ if (zfs_nicestrtonum(NULL, value, &ashift) != 0) {
+ (void) fprintf(stderr,
+ gettext("ashift must be a number.\n"));
+ return (NULL);
+ }
+ if (ashift != 0 &&
+ (ashift < ASHIFT_MIN || ashift > ASHIFT_MAX)) {
+ (void) fprintf(stderr,
+ gettext("invalid 'ashift=%" PRIu64 "' "
+ "property: only values between %" PRId32 " "
+ "and %" PRId32 " are allowed.\n"),
+ ashift, ASHIFT_MIN, ASHIFT_MAX);
+ return (NULL);
+ }
+ }
+ }
+
+ /*
+ * If the device is known to incorrectly report its physical sector
+ * size explicitly provide the known correct value.
+ */
+ if (ashift == 0) {
+ int sector_size;
+
+ if (check_sector_size_database(path, &sector_size) == B_TRUE)
+ ashift = highbit64(sector_size) - 1;
+ }
+
+ if (ashift > 0)
+ (void) nvlist_add_uint64(vdev, ZPOOL_CONFIG_ASHIFT, ashift);
+
+ return (vdev);
+}
+
+/*
+ * Go through and verify the replication level of the pool is consistent.
+ * Performs the following checks:
+ *
+ * For the new spec, verifies that devices in mirrors and raidz are the
+ * same size.
+ *
+ * If the current configuration already has inconsistent replication
+ * levels, ignore any other potential problems in the new spec.
+ *
+ * Otherwise, make sure that the current spec (if there is one) and the new
+ * spec have consistent replication levels.
+ *
+ * If there is no current spec (create), make sure new spec has at least
+ * one general purpose vdev.
+ */
+typedef struct replication_level {
+ char *zprl_type;
+ uint64_t zprl_children;
+ uint64_t zprl_parity;
+} replication_level_t;
+
+#define ZPOOL_FUZZ (16 * 1024 * 1024)
+
+static boolean_t
+is_raidz_mirror(replication_level_t *a, replication_level_t *b,
+ replication_level_t **raidz, replication_level_t **mirror)
+{
+ if (strcmp(a->zprl_type, "raidz") == 0 &&
+ strcmp(b->zprl_type, "mirror") == 0) {
+ *raidz = a;
+ *mirror = b;
+ return (B_TRUE);
+ }
+ return (B_FALSE);
+}
+
+/*
+ * Given a list of toplevel vdevs, return the current replication level. If
+ * the config is inconsistent, then NULL is returned. If 'fatal' is set, then
+ * an error message will be displayed for each self-inconsistent vdev.
+ */
+static replication_level_t *
+get_replication(nvlist_t *nvroot, boolean_t fatal)
+{
+ nvlist_t **top;
+ uint_t t, toplevels;
+ nvlist_t **child;
+ uint_t c, children;
+ nvlist_t *nv;
+ char *type;
+ replication_level_t lastrep = {0};
+ replication_level_t rep;
+ replication_level_t *ret;
+ replication_level_t *raidz, *mirror;
+ boolean_t dontreport;
+
+ ret = safe_malloc(sizeof (replication_level_t));
+
+ verify(nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_CHILDREN,
+ &top, &toplevels) == 0);
+
+ for (t = 0; t < toplevels; t++) {
+ uint64_t is_log = B_FALSE;
+
+ nv = top[t];
+
+ /*
+ * For separate logs we ignore the top level vdev replication
+ * constraints.
+ */
+ (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_IS_LOG, &is_log);
+ if (is_log)
+ continue;
+
+ /* Ignore holes introduced by removing aux devices */
+ verify(nvlist_lookup_string(nv, ZPOOL_CONFIG_TYPE, &type) == 0);
+ if (strcmp(type, VDEV_TYPE_HOLE) == 0)
+ continue;
+
+ if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_CHILDREN,
+ &child, &children) != 0) {
+ /*
+ * This is a 'file' or 'disk' vdev.
+ */
+ rep.zprl_type = type;
+ rep.zprl_children = 1;
+ rep.zprl_parity = 0;
+ } else {
+ int64_t vdev_size;
+
+ /*
+ * This is a mirror or RAID-Z vdev. Go through and make
+ * sure the contents are all the same (files vs. disks),
+ * keeping track of the number of elements in the
+ * process.
+ *
+ * We also check that the size of each vdev (if it can
+ * be determined) is the same.
+ */
+ rep.zprl_type = type;
+ rep.zprl_children = 0;
+
+ if (strcmp(type, VDEV_TYPE_RAIDZ) == 0) {
+ verify(nvlist_lookup_uint64(nv,
+ ZPOOL_CONFIG_NPARITY,
+ &rep.zprl_parity) == 0);
+ assert(rep.zprl_parity != 0);
+ } else {
+ rep.zprl_parity = 0;
+ }
+
+ /*
+ * The 'dontreport' variable indicates that we've
+ * already reported an error for this spec, so don't
+ * bother doing it again.
+ */
+ type = NULL;
+ dontreport = 0;
+ vdev_size = -1LL;
+ for (c = 0; c < children; c++) {
+ nvlist_t *cnv = child[c];
+ char *path;
+ struct stat64 statbuf;
+ int64_t size = -1LL;
+ char *childtype;
+ int fd, err;
+
+ rep.zprl_children++;
+
+ verify(nvlist_lookup_string(cnv,
+ ZPOOL_CONFIG_TYPE, &childtype) == 0);
+
+ /*
+ * If this is a replacing or spare vdev, then
+ * get the real first child of the vdev: do this
+ * in a loop because replacing and spare vdevs
+ * can be nested.
+ */
+ while (strcmp(childtype,
+ VDEV_TYPE_REPLACING) == 0 ||
+ strcmp(childtype, VDEV_TYPE_SPARE) == 0) {
+ nvlist_t **rchild;
+ uint_t rchildren;
+
+ verify(nvlist_lookup_nvlist_array(cnv,
+ ZPOOL_CONFIG_CHILDREN, &rchild,
+ &rchildren) == 0);
+ assert(rchildren == 2);
+ cnv = rchild[0];
+
+ verify(nvlist_lookup_string(cnv,
+ ZPOOL_CONFIG_TYPE,
+ &childtype) == 0);
+ }
+
+ verify(nvlist_lookup_string(cnv,
+ ZPOOL_CONFIG_PATH, &path) == 0);
+
+ /*
+ * If we have a raidz/mirror that combines disks
+ * with files, report it as an error.
+ */
+ if (!dontreport && type != NULL &&
+ strcmp(type, childtype) != 0) {
+ if (ret != NULL)
+ free(ret);
+ ret = NULL;
+ if (fatal)
+ vdev_error(gettext(
+ "mismatched replication "
+ "level: %s contains both "
+ "files and devices\n"),
+ rep.zprl_type);
+ else
+ return (NULL);
+ dontreport = B_TRUE;
+ }
+
+ /*
+ * According to stat(2), the value of 'st_size'
+ * is undefined for block devices and character
+ * devices. But there is no effective way to
+ * determine the real size in userland.
+ *
+ * Instead, we'll take advantage of an
+ * implementation detail of spec_size(). If the
+ * device is currently open, then we (should)
+ * return a valid size.
+ *
+ * If we still don't get a valid size (indicated
+ * by a size of 0 or MAXOFFSET_T), then ignore
+ * this device altogether.
+ */
+ if ((fd = open(path, O_RDONLY)) >= 0) {
+ err = fstat64_blk(fd, &statbuf);
+ (void) close(fd);
+ } else {
+ err = stat64(path, &statbuf);
+ }
+
+ if (err != 0 ||
+ statbuf.st_size == 0 ||
+ statbuf.st_size == MAXOFFSET_T)
+ continue;
+
+ size = statbuf.st_size;
+
+ /*
+ * Also make sure that devices and
+ * slices have a consistent size. If
+ * they differ by a significant amount
+ * (~16MB) then report an error.
+ */
+ if (!dontreport &&
+ (vdev_size != -1LL &&
+ (llabs(size - vdev_size) >
+ ZPOOL_FUZZ))) {
+ if (ret != NULL)
+ free(ret);
+ ret = NULL;
+ if (fatal)
+ vdev_error(gettext(
+ "%s contains devices of "
+ "different sizes\n"),
+ rep.zprl_type);
+ else
+ return (NULL);
+ dontreport = B_TRUE;
+ }
+
+ type = childtype;
+ vdev_size = size;
+ }
+ }
+
+ /*
+ * At this point, we have the replication of the last toplevel
+ * vdev in 'rep'. Compare it to 'lastrep' to see if it is
+ * different.
+ */
+ if (lastrep.zprl_type != NULL) {
+ if (is_raidz_mirror(&lastrep, &rep, &raidz, &mirror) ||
+ is_raidz_mirror(&rep, &lastrep, &raidz, &mirror)) {
+ /*
+ * Accepted raidz and mirror when they can
+ * handle the same number of disk failures.
+ */
+ if (raidz->zprl_parity !=
+ mirror->zprl_children - 1) {
+ if (ret != NULL)
+ free(ret);
+ ret = NULL;
+ if (fatal)
+ vdev_error(gettext(
+ "mismatched replication "
+ "level: "
+ "%s and %s vdevs with "
+ "different redundancy, "
+ "%llu vs. %llu (%llu-way) "
+ "are present\n"),
+ raidz->zprl_type,
+ mirror->zprl_type,
+ raidz->zprl_parity,
+ mirror->zprl_children - 1,
+ mirror->zprl_children);
+ else
+ return (NULL);
+ }
+ } else if (strcmp(lastrep.zprl_type, rep.zprl_type) !=
+ 0) {
+ if (ret != NULL)
+ free(ret);
+ ret = NULL;
+ if (fatal)
+ vdev_error(gettext(
+ "mismatched replication level: "
+ "both %s and %s vdevs are "
+ "present\n"),
+ lastrep.zprl_type, rep.zprl_type);
+ else
+ return (NULL);
+ } else if (lastrep.zprl_parity != rep.zprl_parity) {
+ if (ret)
+ free(ret);
+ ret = NULL;
+ if (fatal)
+ vdev_error(gettext(
+ "mismatched replication level: "
+ "both %llu and %llu device parity "
+ "%s vdevs are present\n"),
+ lastrep.zprl_parity,
+ rep.zprl_parity,
+ rep.zprl_type);
+ else
+ return (NULL);
+ } else if (lastrep.zprl_children != rep.zprl_children) {
+ if (ret)
+ free(ret);
+ ret = NULL;
+ if (fatal)
+ vdev_error(gettext(
+ "mismatched replication level: "
+ "both %llu-way and %llu-way %s "
+ "vdevs are present\n"),
+ lastrep.zprl_children,
+ rep.zprl_children,
+ rep.zprl_type);
+ else
+ return (NULL);
+ }
+ }
+ lastrep = rep;
+ }
+
+ if (ret != NULL)
+ *ret = rep;
+
+ return (ret);
+}
+
+/*
+ * Check the replication level of the vdev spec against the current pool. Calls
+ * get_replication() to make sure the new spec is self-consistent. If the pool
+ * has a consistent replication level, then we ignore any errors. Otherwise,
+ * report any difference between the two.
+ */
+static int
+check_replication(nvlist_t *config, nvlist_t *newroot)
+{
+ nvlist_t **child;
+ uint_t children;
+ replication_level_t *current = NULL, *new;
+ replication_level_t *raidz, *mirror;
+ int ret;
+
+ /*
+ * If we have a current pool configuration, check to see if it's
+ * self-consistent. If not, simply return success.
+ */
+ if (config != NULL) {
+ nvlist_t *nvroot;
+
+ verify(nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE,
+ &nvroot) == 0);
+ if ((current = get_replication(nvroot, B_FALSE)) == NULL)
+ return (0);
+ }
+ /*
+ * for spares there may be no children, and therefore no
+ * replication level to check
+ */
+ if ((nvlist_lookup_nvlist_array(newroot, ZPOOL_CONFIG_CHILDREN,
+ &child, &children) != 0) || (children == 0)) {
+ free(current);
+ return (0);
+ }
+
+ /*
+ * If all we have is logs then there's no replication level to check.
+ */
+ if (num_logs(newroot) == children) {
+ free(current);
+ return (0);
+ }
+
+ /*
+ * Get the replication level of the new vdev spec, reporting any
+ * inconsistencies found.
+ */
+ if ((new = get_replication(newroot, B_TRUE)) == NULL) {
+ free(current);
+ return (-1);
+ }
+
+ /*
+ * Check to see if the new vdev spec matches the replication level of
+ * the current pool.
+ */
+ ret = 0;
+ if (current != NULL) {
+ if (is_raidz_mirror(current, new, &raidz, &mirror) ||
+ is_raidz_mirror(new, current, &raidz, &mirror)) {
+ if (raidz->zprl_parity != mirror->zprl_children - 1) {
+ vdev_error(gettext(
+ "mismatched replication level: pool and "
+ "new vdev with different redundancy, %s "
+ "and %s vdevs, %llu vs. %llu (%llu-way)\n"),
+ raidz->zprl_type,
+ mirror->zprl_type,
+ raidz->zprl_parity,
+ mirror->zprl_children - 1,
+ mirror->zprl_children);
+ ret = -1;
+ }
+ } else if (strcmp(current->zprl_type, new->zprl_type) != 0) {
+ vdev_error(gettext(
+ "mismatched replication level: pool uses %s "
+ "and new vdev is %s\n"),
+ current->zprl_type, new->zprl_type);
+ ret = -1;
+ } else if (current->zprl_parity != new->zprl_parity) {
+ vdev_error(gettext(
+ "mismatched replication level: pool uses %llu "
+ "device parity and new vdev uses %llu\n"),
+ current->zprl_parity, new->zprl_parity);
+ ret = -1;
+ } else if (current->zprl_children != new->zprl_children) {
+ vdev_error(gettext(
+ "mismatched replication level: pool uses %llu-way "
+ "%s and new vdev uses %llu-way %s\n"),
+ current->zprl_children, current->zprl_type,
+ new->zprl_children, new->zprl_type);
+ ret = -1;
+ }
+ }
+
+ free(new);
+ if (current != NULL)
+ free(current);
+
+ return (ret);
+}
+
+static int
+zero_label(char *path)
+{
+ const int size = 4096;
+ char buf[size];
+ int err, fd;
+
+ if ((fd = open(path, O_WRONLY|O_EXCL)) < 0) {
+ (void) fprintf(stderr, gettext("cannot open '%s': %s\n"),
+ path, strerror(errno));
+ return (-1);
+ }
+
+ memset(buf, 0, size);
+ err = write(fd, buf, size);
+ (void) fdatasync(fd);
+ (void) close(fd);
+
+ if (err == -1) {
+ (void) fprintf(stderr, gettext("cannot zero first %d bytes "
+ "of '%s': %s\n"), size, path, strerror(errno));
+ return (-1);
+ }
+
+ if (err != size) {
+ (void) fprintf(stderr, gettext("could only zero %d/%d bytes "
+ "of '%s'\n"), err, size, path);
+ return (-1);
+ }
+
+ return (0);
+}
+
+/*
+ * Go through and find any whole disks in the vdev specification, labelling them
+ * as appropriate. When constructing the vdev spec, we were unable to open this
+ * device in order to provide a devid. Now that we have labelled the disk and
+ * know that slice 0 is valid, we can construct the devid now.
+ *
+ * If the disk was already labeled with an EFI label, we will have gotten the
+ * devid already (because we were able to open the whole disk). Otherwise, we
+ * need to get the devid after we label the disk.
+ */
+static int
+make_disks(zpool_handle_t *zhp, nvlist_t *nv)
+{
+ nvlist_t **child;
+ uint_t c, children;
+ char *type, *path;
+ char devpath[MAXPATHLEN];
+ char udevpath[MAXPATHLEN];
+ uint64_t wholedisk;
+ struct stat64 statbuf;
+ int is_exclusive = 0;
+ int fd;
+ int ret;
+
+ verify(nvlist_lookup_string(nv, ZPOOL_CONFIG_TYPE, &type) == 0);
+
+ if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_CHILDREN,
+ &child, &children) != 0) {
+
+ if (strcmp(type, VDEV_TYPE_DISK) != 0)
+ return (0);
+
+ /*
+ * We have a disk device. If this is a whole disk write
+ * out the efi partition table, otherwise write zero's to
+ * the first 4k of the partition. This is to ensure that
+ * libblkid will not misidentify the partition due to a
+ * magic value left by the previous filesystem.
+ */
+ verify(!nvlist_lookup_string(nv, ZPOOL_CONFIG_PATH, &path));
+ verify(!nvlist_lookup_uint64(nv, ZPOOL_CONFIG_WHOLE_DISK,
+ &wholedisk));
+
+ if (!wholedisk) {
+ /*
+ * Update device id string for mpath nodes (Linux only)
+ */
+ if (is_mpath_whole_disk(path))
+ update_vdev_config_dev_strs(nv);
+
+ if (!is_spare(NULL, path))
+ (void) zero_label(path);
+ return (0);
+ }
+
+ if (realpath(path, devpath) == NULL) {
+ ret = errno;
+ (void) fprintf(stderr,
+ gettext("cannot resolve path '%s'\n"), path);
+ return (ret);
+ }
+
+ /*
+ * Remove any previously existing symlink from a udev path to
+ * the device before labeling the disk. This ensures that
+ * only newly created links are used. Otherwise there is a
+ * window between when udev deletes and recreates the link
+ * during which access attempts will fail with ENOENT.
+ */
+ strlcpy(udevpath, path, MAXPATHLEN);
+ (void) zfs_append_partition(udevpath, MAXPATHLEN);
+
+ fd = open(devpath, O_RDWR|O_EXCL);
+ if (fd == -1) {
+ if (errno == EBUSY)
+ is_exclusive = 1;
+#ifdef __FreeBSD__
+ if (errno == EPERM)
+ is_exclusive = 1;
+#endif
+ } else {
+ (void) close(fd);
+ }
+
+ /*
+ * If the partition exists, contains a valid spare label,
+ * and is opened exclusively there is no need to partition
+ * it. Hot spares have already been partitioned and are
+ * held open exclusively by the kernel as a safety measure.
+ *
+ * If the provided path is for a /dev/disk/ device its
+ * symbolic link will be removed, partition table created,
+ * and then block until udev creates the new link.
+ */
+ if (!is_exclusive && !is_spare(NULL, udevpath)) {
+ char *devnode = strrchr(devpath, '/') + 1;
+
+ ret = strncmp(udevpath, UDISK_ROOT, strlen(UDISK_ROOT));
+ if (ret == 0) {
+ ret = lstat64(udevpath, &statbuf);
+ if (ret == 0 && S_ISLNK(statbuf.st_mode))
+ (void) unlink(udevpath);
+ }
+
+ /*
+ * When labeling a pool the raw device node name
+ * is provided as it appears under /dev/.
+ */
+ if (zpool_label_disk(g_zfs, zhp, devnode) == -1)
+ return (-1);
+
+ /*
+ * Wait for udev to signal the device is available
+ * by the provided path.
+ */
+ ret = zpool_label_disk_wait(udevpath, DISK_LABEL_WAIT);
+ if (ret) {
+ (void) fprintf(stderr,
+ gettext("missing link: %s was "
+ "partitioned but %s is missing\n"),
+ devnode, udevpath);
+ return (ret);
+ }
+
+ ret = zero_label(udevpath);
+ if (ret)
+ return (ret);
+ }
+
+ /*
+ * Update the path to refer to the partition. The presence of
+ * the 'whole_disk' field indicates to the CLI that we should
+ * chop off the partition number when displaying the device in
+ * future output.
+ */
+ verify(nvlist_add_string(nv, ZPOOL_CONFIG_PATH, udevpath) == 0);
+
+ /*
+ * Update device id strings for whole disks (Linux only)
+ */
+ update_vdev_config_dev_strs(nv);
+
+ return (0);
+ }
+
+ for (c = 0; c < children; c++)
+ if ((ret = make_disks(zhp, child[c])) != 0)
+ return (ret);
+
+ if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_SPARES,
+ &child, &children) == 0)
+ for (c = 0; c < children; c++)
+ if ((ret = make_disks(zhp, child[c])) != 0)
+ return (ret);
+
+ if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_L2CACHE,
+ &child, &children) == 0)
+ for (c = 0; c < children; c++)
+ if ((ret = make_disks(zhp, child[c])) != 0)
+ return (ret);
+
+ return (0);
+}
+
+/*
+ * Go through and find any devices that are in use. We rely on libdiskmgt for
+ * the majority of this task.
+ */
+static boolean_t
+is_device_in_use(nvlist_t *config, nvlist_t *nv, boolean_t force,
+ boolean_t replacing, boolean_t isspare)
+{
+ nvlist_t **child;
+ uint_t c, children;
+ char *type, *path;
+ int ret = 0;
+ char buf[MAXPATHLEN];
+ uint64_t wholedisk = B_FALSE;
+ boolean_t anyinuse = B_FALSE;
+
+ verify(nvlist_lookup_string(nv, ZPOOL_CONFIG_TYPE, &type) == 0);
+
+ if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_CHILDREN,
+ &child, &children) != 0) {
+
+ verify(!nvlist_lookup_string(nv, ZPOOL_CONFIG_PATH, &path));
+ if (strcmp(type, VDEV_TYPE_DISK) == 0)
+ verify(!nvlist_lookup_uint64(nv,
+ ZPOOL_CONFIG_WHOLE_DISK, &wholedisk));
+
+ /*
+ * As a generic check, we look to see if this is a replace of a
+ * hot spare within the same pool. If so, we allow it
+ * regardless of what libblkid or zpool_in_use() says.
+ */
+ if (replacing) {
+ (void) strlcpy(buf, path, sizeof (buf));
+ if (wholedisk) {
+ ret = zfs_append_partition(buf, sizeof (buf));
+ if (ret == -1)
+ return (-1);
+ }
+
+ if (is_spare(config, buf))
+ return (B_FALSE);
+ }
+
+ if (strcmp(type, VDEV_TYPE_DISK) == 0)
+ ret = check_device(path, force, isspare, wholedisk);
+
+ else if (strcmp(type, VDEV_TYPE_FILE) == 0)
+ ret = check_file(path, force, isspare);
+
+ return (ret != 0);
+ }
+
+ for (c = 0; c < children; c++)
+ if (is_device_in_use(config, child[c], force, replacing,
+ B_FALSE))
+ anyinuse = B_TRUE;
+
+ if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_SPARES,
+ &child, &children) == 0)
+ for (c = 0; c < children; c++)
+ if (is_device_in_use(config, child[c], force, replacing,
+ B_TRUE))
+ anyinuse = B_TRUE;
+
+ if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_L2CACHE,
+ &child, &children) == 0)
+ for (c = 0; c < children; c++)
+ if (is_device_in_use(config, child[c], force, replacing,
+ B_FALSE))
+ anyinuse = B_TRUE;
+
+ return (anyinuse);
+}
+
+static const char *
+is_grouping(const char *type, int *mindev, int *maxdev)
+{
+ if (strncmp(type, "raidz", 5) == 0) {
+ const char *p = type + 5;
+ char *end;
+ long nparity;
+
+ if (*p == '\0') {
+ nparity = 1;
+ } else if (*p == '0') {
+ return (NULL); /* no zero prefixes allowed */
+ } else {
+ errno = 0;
+ nparity = strtol(p, &end, 10);
+ if (errno != 0 || nparity < 1 || nparity >= 255 ||
+ *end != '\0')
+ return (NULL);
+ }
+
+ if (mindev != NULL)
+ *mindev = nparity + 1;
+ if (maxdev != NULL)
+ *maxdev = 255;
+ return (VDEV_TYPE_RAIDZ);
+ }
+
+ if (maxdev != NULL)
+ *maxdev = INT_MAX;
+
+ if (strcmp(type, "mirror") == 0) {
+ if (mindev != NULL)
+ *mindev = 2;
+ return (VDEV_TYPE_MIRROR);
+ }
+
+ if (strcmp(type, "spare") == 0) {
+ if (mindev != NULL)
+ *mindev = 1;
+ return (VDEV_TYPE_SPARE);
+ }
+
+ if (strcmp(type, "log") == 0) {
+ if (mindev != NULL)
+ *mindev = 1;
+ return (VDEV_TYPE_LOG);
+ }
+
+ if (strcmp(type, VDEV_ALLOC_BIAS_SPECIAL) == 0 ||
+ strcmp(type, VDEV_ALLOC_BIAS_DEDUP) == 0) {
+ if (mindev != NULL)
+ *mindev = 1;
+ return (type);
+ }
+
+ if (strcmp(type, "cache") == 0) {
+ if (mindev != NULL)
+ *mindev = 1;
+ return (VDEV_TYPE_L2CACHE);
+ }
+
+ return (NULL);
+}
+
+/*
+ * Construct a syntactically valid vdev specification,
+ * and ensure that all devices and files exist and can be opened.
+ * Note: we don't bother freeing anything in the error paths
+ * because the program is just going to exit anyway.
+ */
+static nvlist_t *
+construct_spec(nvlist_t *props, int argc, char **argv)
+{
+ nvlist_t *nvroot, *nv, **top, **spares, **l2cache;
+ int t, toplevels, mindev, maxdev, nspares, nlogs, nl2cache;
+ const char *type;
+ uint64_t is_log, is_special, is_dedup;
+ boolean_t seen_logs;
+
+ top = NULL;
+ toplevels = 0;
+ spares = NULL;
+ l2cache = NULL;
+ nspares = 0;
+ nlogs = 0;
+ nl2cache = 0;
+ is_log = is_special = is_dedup = B_FALSE;
+ seen_logs = B_FALSE;
+ nvroot = NULL;
+
+ while (argc > 0) {
+ nv = NULL;
+
+ /*
+ * If it's a mirror or raidz, the subsequent arguments are
+ * its leaves -- until we encounter the next mirror or raidz.
+ */
+ if ((type = is_grouping(argv[0], &mindev, &maxdev)) != NULL) {
+ nvlist_t **child = NULL;
+ int c, children = 0;
+
+ if (strcmp(type, VDEV_TYPE_SPARE) == 0) {
+ if (spares != NULL) {
+ (void) fprintf(stderr,
+ gettext("invalid vdev "
+ "specification: 'spare' can be "
+ "specified only once\n"));
+ goto spec_out;
+ }
+ is_log = is_special = is_dedup = B_FALSE;
+ }
+
+ if (strcmp(type, VDEV_TYPE_LOG) == 0) {
+ if (seen_logs) {
+ (void) fprintf(stderr,
+ gettext("invalid vdev "
+ "specification: 'log' can be "
+ "specified only once\n"));
+ goto spec_out;
+ }
+ seen_logs = B_TRUE;
+ is_log = B_TRUE;
+ is_special = B_FALSE;
+ is_dedup = B_FALSE;
+ argc--;
+ argv++;
+ /*
+ * A log is not a real grouping device.
+ * We just set is_log and continue.
+ */
+ continue;
+ }
+
+ if (strcmp(type, VDEV_ALLOC_BIAS_SPECIAL) == 0) {
+ is_special = B_TRUE;
+ is_log = B_FALSE;
+ is_dedup = B_FALSE;
+ argc--;
+ argv++;
+ continue;
+ }
+
+ if (strcmp(type, VDEV_ALLOC_BIAS_DEDUP) == 0) {
+ is_dedup = B_TRUE;
+ is_log = B_FALSE;
+ is_special = B_FALSE;
+ argc--;
+ argv++;
+ continue;
+ }
+
+ if (strcmp(type, VDEV_TYPE_L2CACHE) == 0) {
+ if (l2cache != NULL) {
+ (void) fprintf(stderr,
+ gettext("invalid vdev "
+ "specification: 'cache' can be "
+ "specified only once\n"));
+ goto spec_out;
+ }
+ is_log = is_special = is_dedup = B_FALSE;
+ }
+
+ if (is_log || is_special || is_dedup) {
+ if (strcmp(type, VDEV_TYPE_MIRROR) != 0) {
+ (void) fprintf(stderr,
+ gettext("invalid vdev "
+ "specification: unsupported '%s' "
+ "device: %s\n"), is_log ? "log" :
+ "special", type);
+ goto spec_out;
+ }
+ nlogs++;
+ }
+
+ for (c = 1; c < argc; c++) {
+ if (is_grouping(argv[c], NULL, NULL) != NULL)
+ break;
+ children++;
+ child = realloc(child,
+ children * sizeof (nvlist_t *));
+ if (child == NULL)
+ zpool_no_memory();
+ if ((nv = make_leaf_vdev(props, argv[c],
+ B_FALSE)) == NULL) {
+ for (c = 0; c < children - 1; c++)
+ nvlist_free(child[c]);
+ free(child);
+ goto spec_out;
+ }
+
+ child[children - 1] = nv;
+ }
+
+ if (children < mindev) {
+ (void) fprintf(stderr, gettext("invalid vdev "
+ "specification: %s requires at least %d "
+ "devices\n"), argv[0], mindev);
+ for (c = 0; c < children; c++)
+ nvlist_free(child[c]);
+ free(child);
+ goto spec_out;
+ }
+
+ if (children > maxdev) {
+ (void) fprintf(stderr, gettext("invalid vdev "
+ "specification: %s supports no more than "
+ "%d devices\n"), argv[0], maxdev);
+ for (c = 0; c < children; c++)
+ nvlist_free(child[c]);
+ free(child);
+ goto spec_out;
+ }
+
+ argc -= c;
+ argv += c;
+
+ if (strcmp(type, VDEV_TYPE_SPARE) == 0) {
+ spares = child;
+ nspares = children;
+ continue;
+ } else if (strcmp(type, VDEV_TYPE_L2CACHE) == 0) {
+ l2cache = child;
+ nl2cache = children;
+ continue;
+ } else {
+ /* create a top-level vdev with children */
+ verify(nvlist_alloc(&nv, NV_UNIQUE_NAME,
+ 0) == 0);
+ verify(nvlist_add_string(nv, ZPOOL_CONFIG_TYPE,
+ type) == 0);
+ verify(nvlist_add_uint64(nv,
+ ZPOOL_CONFIG_IS_LOG, is_log) == 0);
+ if (is_log)
+ verify(nvlist_add_string(nv,
+ ZPOOL_CONFIG_ALLOCATION_BIAS,
+ VDEV_ALLOC_BIAS_LOG) == 0);
+ if (is_special) {
+ verify(nvlist_add_string(nv,
+ ZPOOL_CONFIG_ALLOCATION_BIAS,
+ VDEV_ALLOC_BIAS_SPECIAL) == 0);
+ }
+ if (is_dedup) {
+ verify(nvlist_add_string(nv,
+ ZPOOL_CONFIG_ALLOCATION_BIAS,
+ VDEV_ALLOC_BIAS_DEDUP) == 0);
+ }
+ if (strcmp(type, VDEV_TYPE_RAIDZ) == 0) {
+ verify(nvlist_add_uint64(nv,
+ ZPOOL_CONFIG_NPARITY,
+ mindev - 1) == 0);
+ }
+ verify(nvlist_add_nvlist_array(nv,
+ ZPOOL_CONFIG_CHILDREN, child,
+ children) == 0);
+
+ for (c = 0; c < children; c++)
+ nvlist_free(child[c]);
+ free(child);
+ }
+ } else {
+ /*
+ * We have a device. Pass off to make_leaf_vdev() to
+ * construct the appropriate nvlist describing the vdev.
+ */
+ if ((nv = make_leaf_vdev(props, argv[0],
+ is_log)) == NULL)
+ goto spec_out;
+
+ if (is_log)
+ nlogs++;
+ if (is_special) {
+ verify(nvlist_add_string(nv,
+ ZPOOL_CONFIG_ALLOCATION_BIAS,
+ VDEV_ALLOC_BIAS_SPECIAL) == 0);
+ }
+ if (is_dedup) {
+ verify(nvlist_add_string(nv,
+ ZPOOL_CONFIG_ALLOCATION_BIAS,
+ VDEV_ALLOC_BIAS_DEDUP) == 0);
+ }
+ argc--;
+ argv++;
+ }
+
+ toplevels++;
+ top = realloc(top, toplevels * sizeof (nvlist_t *));
+ if (top == NULL)
+ zpool_no_memory();
+ top[toplevels - 1] = nv;
+ }
+
+ if (toplevels == 0 && nspares == 0 && nl2cache == 0) {
+ (void) fprintf(stderr, gettext("invalid vdev "
+ "specification: at least one toplevel vdev must be "
+ "specified\n"));
+ goto spec_out;
+ }
+
+ if (seen_logs && nlogs == 0) {
+ (void) fprintf(stderr, gettext("invalid vdev specification: "
+ "log requires at least 1 device\n"));
+ goto spec_out;
+ }
+
+ /*
+ * Finally, create nvroot and add all top-level vdevs to it.
+ */
+ verify(nvlist_alloc(&nvroot, NV_UNIQUE_NAME, 0) == 0);
+ verify(nvlist_add_string(nvroot, ZPOOL_CONFIG_TYPE,
+ VDEV_TYPE_ROOT) == 0);
+ verify(nvlist_add_nvlist_array(nvroot, ZPOOL_CONFIG_CHILDREN,
+ top, toplevels) == 0);
+ if (nspares != 0)
+ verify(nvlist_add_nvlist_array(nvroot, ZPOOL_CONFIG_SPARES,
+ spares, nspares) == 0);
+ if (nl2cache != 0)
+ verify(nvlist_add_nvlist_array(nvroot, ZPOOL_CONFIG_L2CACHE,
+ l2cache, nl2cache) == 0);
+
+spec_out:
+ for (t = 0; t < toplevels; t++)
+ nvlist_free(top[t]);
+ for (t = 0; t < nspares; t++)
+ nvlist_free(spares[t]);
+ for (t = 0; t < nl2cache; t++)
+ nvlist_free(l2cache[t]);
+
+ free(spares);
+ free(l2cache);
+ free(top);
+
+ return (nvroot);
+}
+
+nvlist_t *
+split_mirror_vdev(zpool_handle_t *zhp, char *newname, nvlist_t *props,
+ splitflags_t flags, int argc, char **argv)
+{
+ nvlist_t *newroot = NULL, **child;
+ uint_t c, children;
+
+ if (argc > 0) {
+ if ((newroot = construct_spec(props, argc, argv)) == NULL) {
+ (void) fprintf(stderr, gettext("Unable to build a "
+ "pool from the specified devices\n"));
+ return (NULL);
+ }
+
+ if (!flags.dryrun && make_disks(zhp, newroot) != 0) {
+ nvlist_free(newroot);
+ return (NULL);
+ }
+
+ /* avoid any tricks in the spec */
+ verify(nvlist_lookup_nvlist_array(newroot,
+ ZPOOL_CONFIG_CHILDREN, &child, &children) == 0);
+ for (c = 0; c < children; c++) {
+ char *path;
+ const char *type;
+ int min, max;
+
+ verify(nvlist_lookup_string(child[c],
+ ZPOOL_CONFIG_PATH, &path) == 0);
+ if ((type = is_grouping(path, &min, &max)) != NULL) {
+ (void) fprintf(stderr, gettext("Cannot use "
+ "'%s' as a device for splitting\n"), type);
+ nvlist_free(newroot);
+ return (NULL);
+ }
+ }
+ }
+
+ if (zpool_vdev_split(zhp, newname, &newroot, props, flags) != 0) {
+ nvlist_free(newroot);
+ return (NULL);
+ }
+
+ return (newroot);
+}
+
+static int
+num_normal_vdevs(nvlist_t *nvroot)
+{
+ nvlist_t **top;
+ uint_t t, toplevels, normal = 0;
+
+ verify(nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_CHILDREN,
+ &top, &toplevels) == 0);
+
+ for (t = 0; t < toplevels; t++) {
+ uint64_t log = B_FALSE;
+
+ (void) nvlist_lookup_uint64(top[t], ZPOOL_CONFIG_IS_LOG, &log);
+ if (log)
+ continue;
+ if (nvlist_exists(top[t], ZPOOL_CONFIG_ALLOCATION_BIAS))
+ continue;
+
+ normal++;
+ }
+
+ return (normal);
+}
+
+/*
+ * Get and validate the contents of the given vdev specification. This ensures
+ * that the nvlist returned is well-formed, that all the devices exist, and that
+ * they are not currently in use by any other known consumer. The 'poolconfig'
+ * parameter is the current configuration of the pool when adding devices
+ * existing pool, and is used to perform additional checks, such as changing the
+ * replication level of the pool. It can be 'NULL' to indicate that this is a
+ * new pool. The 'force' flag controls whether devices should be forcefully
+ * added, even if they appear in use.
+ */
+nvlist_t *
+make_root_vdev(zpool_handle_t *zhp, nvlist_t *props, int force, int check_rep,
+ boolean_t replacing, boolean_t dryrun, int argc, char **argv)
+{
+ nvlist_t *newroot;
+ nvlist_t *poolconfig = NULL;
+ is_force = force;
+
+ /*
+ * Construct the vdev specification. If this is successful, we know
+ * that we have a valid specification, and that all devices can be
+ * opened.
+ */
+ if ((newroot = construct_spec(props, argc, argv)) == NULL)
+ return (NULL);
+
+ if (zhp && ((poolconfig = zpool_get_config(zhp, NULL)) == NULL)) {
+ nvlist_free(newroot);
+ return (NULL);
+ }
+
+ /*
+ * Validate each device to make sure that it's not shared with another
+ * subsystem. We do this even if 'force' is set, because there are some
+ * uses (such as a dedicated dump device) that even '-f' cannot
+ * override.
+ */
+ if (is_device_in_use(poolconfig, newroot, force, replacing, B_FALSE)) {
+ nvlist_free(newroot);
+ return (NULL);
+ }
+
+ /*
+ * Check the replication level of the given vdevs and report any errors
+ * found. We include the existing pool spec, if any, as we need to
+ * catch changes against the existing replication level.
+ */
+ if (check_rep && check_replication(poolconfig, newroot) != 0) {
+ nvlist_free(newroot);
+ return (NULL);
+ }
+
+ /*
+ * On pool create the new vdev spec must have one normal vdev.
+ */
+ if (poolconfig == NULL && num_normal_vdevs(newroot) == 0) {
+ vdev_error(gettext("at least one general top-level vdev must "
+ "be specified\n"));
+ nvlist_free(newroot);
+ return (NULL);
+ }
+
+ /*
+ * Run through the vdev specification and label any whole disks found.
+ */
+ if (!dryrun && make_disks(zhp, newroot) != 0) {
+ nvlist_free(newroot);
+ return (NULL);
+ }
+
+ return (newroot);
+}