1 files changed, 6564 insertions, 0 deletions

diff --git a/cmd/zfs/zfs_main.c b/cmd/zfs/zfs_main.c
new file mode 100644
index 000000000000..b64905f11997
--- /dev/null
+++ b/cmd/zfs/zfs_main.c
@@ -0,0 +1,6564 @@
+/*
+ * 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 2012 Nexenta Systems, Inc. All rights reserved.
+ * Copyright (c) 2012 by Delphix. All rights reserved.
+ * Copyright 2012 Milan Jurik. All rights reserved.
+ * Copyright (c) 2012, Joyent, Inc. All rights reserved.
+ */
+
+#include <assert.h>
+#include <ctype.h>
+#include <errno.h>
+#include <libgen.h>
+#include <libintl.h>
+#include <libuutil.h>
+#include <libnvpair.h>
+#include <locale.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <strings.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <zone.h>
+#include <grp.h>
+#include <pwd.h>
+#include <signal.h>
+#include <sys/list.h>
+#include <sys/mkdev.h>
+#include <sys/mntent.h>
+#include <sys/mnttab.h>
+#include <sys/mount.h>
+#include <sys/stat.h>
+#include <sys/fs/zfs.h>
+#include <sys/types.h>
+#include <time.h>
+
+#include <libzfs.h>
+#include <zfs_prop.h>
+#include <zfs_deleg.h>
+#include <libuutil.h>
+#include <aclutils.h>
+#include <directory.h>
+
+#include "zfs_iter.h"
+#include "zfs_util.h"
+#include "zfs_comutil.h"
+
+libzfs_handle_t *g_zfs;
+
+static FILE *mnttab_file;
+static char history_str[HIS_MAX_RECORD_LEN];
+
+static int zfs_do_clone(int argc, char **argv);
+static int zfs_do_create(int argc, char **argv);
+static int zfs_do_destroy(int argc, char **argv);
+static int zfs_do_get(int argc, char **argv);
+static int zfs_do_inherit(int argc, char **argv);
+static int zfs_do_list(int argc, char **argv);
+static int zfs_do_mount(int argc, char **argv);
+static int zfs_do_rename(int argc, char **argv);
+static int zfs_do_rollback(int argc, char **argv);
+static int zfs_do_set(int argc, char **argv);
+static int zfs_do_upgrade(int argc, char **argv);
+static int zfs_do_snapshot(int argc, char **argv);
+static int zfs_do_unmount(int argc, char **argv);
+static int zfs_do_share(int argc, char **argv);
+static int zfs_do_unshare(int argc, char **argv);
+static int zfs_do_send(int argc, char **argv);
+static int zfs_do_receive(int argc, char **argv);
+static int zfs_do_promote(int argc, char **argv);
+static int zfs_do_userspace(int argc, char **argv);
+static int zfs_do_allow(int argc, char **argv);
+static int zfs_do_unallow(int argc, char **argv);
+static int zfs_do_hold(int argc, char **argv);
+static int zfs_do_holds(int argc, char **argv);
+static int zfs_do_release(int argc, char **argv);
+static int zfs_do_diff(int argc, char **argv);
+
+/*
+ * Enable a reasonable set of defaults for libumem debugging on DEBUG builds.
+ */
+
+#ifdef DEBUG
+const char *
+_umem_debug_init(void)
+{
+	return ("default,verbose"); /* $UMEM_DEBUG setting */
+}
+
+const char *
+_umem_logging_init(void)
+{
+	return ("fail,contents"); /* $UMEM_LOGGING setting */
+}
+#endif
+
+typedef enum {
+	HELP_CLONE,
+	HELP_CREATE,
+	HELP_DESTROY,
+	HELP_GET,
+	HELP_INHERIT,
+	HELP_UPGRADE,
+	HELP_LIST,
+	HELP_MOUNT,
+	HELP_PROMOTE,
+	HELP_RECEIVE,
+	HELP_RENAME,
+	HELP_ROLLBACK,
+	HELP_SEND,
+	HELP_SET,
+	HELP_SHARE,
+	HELP_SNAPSHOT,
+	HELP_UNMOUNT,
+	HELP_UNSHARE,
+	HELP_ALLOW,
+	HELP_UNALLOW,
+	HELP_USERSPACE,
+	HELP_GROUPSPACE,
+	HELP_HOLD,
+	HELP_HOLDS,
+	HELP_RELEASE,
+	HELP_DIFF,
+} zfs_help_t;
+
+typedef struct zfs_command {
+	const char	*name;
+	int		(*func)(int argc, char **argv);
+	zfs_help_t	usage;
+} zfs_command_t;
+
+/*
+ * Master command table.  Each ZFS command has a name, associated function, and
+ * usage message.  The usage messages need to be internationalized, so we have
+ * to have a function to return the usage message based on a command index.
+ *
+ * These commands are organized according to how they are displayed in the usage
+ * message.  An empty command (one with a NULL name) indicates an empty line in
+ * the generic usage message.
+ */
+static zfs_command_t command_table[] = {
+	{ "create",	zfs_do_create,		HELP_CREATE		},
+	{ "destroy",	zfs_do_destroy,		HELP_DESTROY		},
+	{ NULL },
+	{ "snapshot",	zfs_do_snapshot,	HELP_SNAPSHOT		},
+	{ "rollback",	zfs_do_rollback,	HELP_ROLLBACK		},
+	{ "clone",	zfs_do_clone,		HELP_CLONE		},
+	{ "promote",	zfs_do_promote,		HELP_PROMOTE		},
+	{ "rename",	zfs_do_rename,		HELP_RENAME		},
+	{ NULL },
+	{ "list",	zfs_do_list,		HELP_LIST		},
+	{ NULL },
+	{ "set",	zfs_do_set,		HELP_SET		},
+	{ "get",	zfs_do_get,		HELP_GET		},
+	{ "inherit",	zfs_do_inherit,		HELP_INHERIT		},
+	{ "upgrade",	zfs_do_upgrade,		HELP_UPGRADE		},
+	{ "userspace",	zfs_do_userspace,	HELP_USERSPACE		},
+	{ "groupspace",	zfs_do_userspace,	HELP_GROUPSPACE		},
+	{ NULL },
+	{ "mount",	zfs_do_mount,		HELP_MOUNT		},
+	{ "unmount",	zfs_do_unmount,		HELP_UNMOUNT		},
+	{ "share",	zfs_do_share,		HELP_SHARE		},
+	{ "unshare",	zfs_do_unshare,		HELP_UNSHARE		},
+	{ NULL },
+	{ "send",	zfs_do_send,		HELP_SEND		},
+	{ "receive",	zfs_do_receive,		HELP_RECEIVE		},
+	{ NULL },
+	{ "allow",	zfs_do_allow,		HELP_ALLOW		},
+	{ NULL },
+	{ "unallow",	zfs_do_unallow,		HELP_UNALLOW		},
+	{ NULL },
+	{ "hold",	zfs_do_hold,		HELP_HOLD		},
+	{ "holds",	zfs_do_holds,		HELP_HOLDS		},
+	{ "release",	zfs_do_release,		HELP_RELEASE		},
+	{ "diff",	zfs_do_diff,		HELP_DIFF		},
+};
+
+#define	NCOMMAND	(sizeof (command_table) / sizeof (command_table[0]))
+
+zfs_command_t *current_command;
+
+static const char *
+get_usage(zfs_help_t idx)
+{
+	switch (idx) {
+	case HELP_CLONE:
+		return (gettext("\tclone [-p] [-o property=value] ... "
+		    "<snapshot> <filesystem|volume>\n"));
+	case HELP_CREATE:
+		return (gettext("\tcreate [-p] [-o property=value] ... "
+		    "<filesystem>\n"
+		    "\tcreate [-ps] [-b blocksize] [-o property=value] ... "
+		    "-V <size> <volume>\n"));
+	case HELP_DESTROY:
+		return (gettext("\tdestroy [-fnpRrv] <filesystem|volume>\n"
+		    "\tdestroy [-dnpRrv] "
+		    "<filesystem|volume>@<snap>[%<snap>][,...]\n"));
+	case HELP_GET:
+		return (gettext("\tget [-rHp] [-d max] "
+		    "[-o \"all\" | field[,...]] [-t type[,...]] "
+		    "[-s source[,...]]\n"
+		    "\t    <\"all\" | property[,...]> "
+		    "[filesystem|volume|snapshot] ...\n"));
+	case HELP_INHERIT:
+		return (gettext("\tinherit [-rS] <property> "
+		    "<filesystem|volume|snapshot> ...\n"));
+	case HELP_UPGRADE:
+		return (gettext("\tupgrade [-v]\n"
+		    "\tupgrade [-r] [-V version] <-a | filesystem ...>\n"));
+	case HELP_LIST:
+		return (gettext("\tlist [-rH][-d max] "
+		    "[-o property[,...]] [-t type[,...]] [-s property] ...\n"
+		    "\t    [-S property] ... "
+		    "[filesystem|volume|snapshot] ...\n"));
+	case HELP_MOUNT:
+		return (gettext("\tmount\n"
+		    "\tmount [-vO] [-o opts] <-a | filesystem>\n"));
+	case HELP_PROMOTE:
+		return (gettext("\tpromote <clone-filesystem>\n"));
+	case HELP_RECEIVE:
+		return (gettext("\treceive [-vnFu] <filesystem|volume|"
+		"snapshot>\n"
+		"\treceive [-vnFu] [-d | -e] <filesystem>\n"));
+	case HELP_RENAME:
+		return (gettext("\trename [-f] <filesystem|volume|snapshot> "
+		    "<filesystem|volume|snapshot>\n"
+		    "\trename [-f] -p <filesystem|volume> <filesystem|volume>\n"
+		    "\trename -r <snapshot> <snapshot>"));
+	case HELP_ROLLBACK:
+		return (gettext("\trollback [-rRf] <snapshot>\n"));
+	case HELP_SEND:
+		return (gettext("\tsend [-DnPpRrv] [-[iI] snapshot] "
+		    "<snapshot>\n"));
+	case HELP_SET:
+		return (gettext("\tset <property=value> "
+		    "<filesystem|volume|snapshot> ...\n"));
+	case HELP_SHARE:
+		return (gettext("\tshare <-a | filesystem>\n"));
+	case HELP_SNAPSHOT:
+		return (gettext("\tsnapshot [-r] [-o property=value] ... "
+		    "<filesystem@snapname|volume@snapname>\n"));
+	case HELP_UNMOUNT:
+		return (gettext("\tunmount [-f] "
+		    "<-a | filesystem|mountpoint>\n"));
+	case HELP_UNSHARE:
+		return (gettext("\tunshare "
+		    "<-a | filesystem|mountpoint>\n"));
+	case HELP_ALLOW:
+		return (gettext("\tallow <filesystem|volume>\n"
+		    "\tallow [-ldug] "
+		    "<\"everyone\"|user|group>[,...] <perm|@setname>[,...]\n"
+		    "\t    <filesystem|volume>\n"
+		    "\tallow [-ld] -e <perm|@setname>[,...] "
+		    "<filesystem|volume>\n"
+		    "\tallow -c <perm|@setname>[,...] <filesystem|volume>\n"
+		    "\tallow -s @setname <perm|@setname>[,...] "
+		    "<filesystem|volume>\n"));
+	case HELP_UNALLOW:
+		return (gettext("\tunallow [-rldug] "
+		    "<\"everyone\"|user|group>[,...]\n"
+		    "\t    [<perm|@setname>[,...]] <filesystem|volume>\n"
+		    "\tunallow [-rld] -e [<perm|@setname>[,...]] "
+		    "<filesystem|volume>\n"
+		    "\tunallow [-r] -c [<perm|@setname>[,...]] "
+		    "<filesystem|volume>\n"
+		    "\tunallow [-r] -s @setname [<perm|@setname>[,...]] "
+		    "<filesystem|volume>\n"));
+	case HELP_USERSPACE:
+		return (gettext("\tuserspace [-hniHp] [-o field[,...]] "
+		    "[-sS field] ... [-t type[,...]]\n"
+		    "\t    <filesystem|snapshot>\n"));
+	case HELP_GROUPSPACE:
+		return (gettext("\tgroupspace [-hniHpU] [-o field[,...]] "
+		    "[-sS field] ... [-t type[,...]]\n"
+		    "\t    <filesystem|snapshot>\n"));
+	case HELP_HOLD:
+		return (gettext("\thold [-r] <tag> <snapshot> ...\n"));
+	case HELP_HOLDS:
+		return (gettext("\tholds [-r] <snapshot> ...\n"));
+	case HELP_RELEASE:
+		return (gettext("\trelease [-r] <tag> <snapshot> ...\n"));
+	case HELP_DIFF:
+		return (gettext("\tdiff [-FHt] <snapshot> "
+		    "[snapshot|filesystem]\n"));
+	}
+
+	abort();
+	/* NOTREACHED */
+}
+
+void
+nomem(void)
+{
+	(void) fprintf(stderr, gettext("internal error: out of memory\n"));
+	exit(1);
+}
+
+/*
+ * Utility function to guarantee malloc() success.
+ */
+
+void *
+safe_malloc(size_t size)
+{
+	void *data;
+
+	if ((data = calloc(1, size)) == NULL)
+		nomem();
+
+	return (data);
+}
+
+static char *
+safe_strdup(char *str)
+{
+	char *dupstr = strdup(str);
+
+	if (dupstr == NULL)
+		nomem();
+
+	return (dupstr);
+}
+
+/*
+ * Callback routine that will print out information for each of
+ * the properties.
+ */
+static int
+usage_prop_cb(int prop, void *cb)
+{
+	FILE *fp = cb;
+
+	(void) fprintf(fp, "\t%-15s ", zfs_prop_to_name(prop));
+
+	if (zfs_prop_readonly(prop))
+		(void) fprintf(fp, " NO    ");
+	else
+		(void) fprintf(fp, "YES    ");
+
+	if (zfs_prop_inheritable(prop))
+		(void) fprintf(fp, "  YES   ");
+	else
+		(void) fprintf(fp, "   NO   ");
+
+	if (zfs_prop_values(prop) == NULL)
+		(void) fprintf(fp, "-\n");
+	else
+		(void) fprintf(fp, "%s\n", zfs_prop_values(prop));
+
+	return (ZPROP_CONT);
+}
+
+/*
+ * Display usage message.  If we're inside a command, display only the usage for
+ * that command.  Otherwise, iterate over the entire command table and display
+ * a complete usage message.
+ */
+static void
+usage(boolean_t requested)
+{
+	int i;
+	boolean_t show_properties = B_FALSE;
+	FILE *fp = requested ? stdout : stderr;
+
+	if (current_command == NULL) {
+
+		(void) fprintf(fp, gettext("usage: zfs command args ...\n"));
+		(void) fprintf(fp,
+		    gettext("where 'command' is one of the following:\n\n"));
+
+		for (i = 0; i < NCOMMAND; i++) {
+			if (command_table[i].name == NULL)
+				(void) fprintf(fp, "\n");
+			else
+				(void) fprintf(fp, "%s",
+				    get_usage(command_table[i].usage));
+		}
+
+		(void) fprintf(fp, gettext("\nEach dataset is of the form: "
+		    "pool/[dataset/]*dataset[@name]\n"));
+	} else {
+		(void) fprintf(fp, gettext("usage:\n"));
+		(void) fprintf(fp, "%s", get_usage(current_command->usage));
+	}
+
+	if (current_command != NULL &&
+	    (strcmp(current_command->name, "set") == 0 ||
+	    strcmp(current_command->name, "get") == 0 ||
+	    strcmp(current_command->name, "inherit") == 0 ||
+	    strcmp(current_command->name, "list") == 0))
+		show_properties = B_TRUE;
+
+	if (show_properties) {
+		(void) fprintf(fp,
+		    gettext("\nThe following properties are supported:\n"));
+
+		(void) fprintf(fp, "\n\t%-14s %s  %s   %s\n\n",
+		    "PROPERTY", "EDIT", "INHERIT", "VALUES");
+
+		/* Iterate over all properties */
+		(void) zprop_iter(usage_prop_cb, fp, B_FALSE, B_TRUE,
+		    ZFS_TYPE_DATASET);
+
+		(void) fprintf(fp, "\t%-15s ", "userused@...");
+		(void) fprintf(fp, " NO       NO   <size>\n");
+		(void) fprintf(fp, "\t%-15s ", "groupused@...");
+		(void) fprintf(fp, " NO       NO   <size>\n");
+		(void) fprintf(fp, "\t%-15s ", "userquota@...");
+		(void) fprintf(fp, "YES       NO   <size> | none\n");
+		(void) fprintf(fp, "\t%-15s ", "groupquota@...");
+		(void) fprintf(fp, "YES       NO   <size> | none\n");
+		(void) fprintf(fp, "\t%-15s ", "written@<snap>");
+		(void) fprintf(fp, " NO       NO   <size>\n");
+
+		(void) fprintf(fp, gettext("\nSizes are specified in bytes "
+		    "with standard units such as K, M, G, etc.\n"));
+		(void) fprintf(fp, gettext("\nUser-defined properties can "
+		    "be specified by using a name containing a colon (:).\n"));
+		(void) fprintf(fp, gettext("\nThe {user|group}{used|quota}@ "
+		    "properties must be appended with\n"
+		    "a user or group specifier of one of these forms:\n"
+		    "    POSIX name      (eg: \"matt\")\n"
+		    "    POSIX id        (eg: \"126829\")\n"
+		    "    SMB name@domain (eg: \"matt@sun\")\n"
+		    "    SMB SID         (eg: \"S-1-234-567-89\")\n"));
+	} else {
+		(void) fprintf(fp,
+		    gettext("\nFor the property list, run: %s\n"),
+		    "zfs set|get");
+		(void) fprintf(fp,
+		    gettext("\nFor the delegated permission list, run: %s\n"),
+		    "zfs allow|unallow");
+	}
+
+	/*
+	 * See comments at end of main().
+	 */
+	if (getenv("ZFS_ABORT") != NULL) {
+		(void) printf("dumping core by request\n");
+		abort();
+	}
+
+	exit(requested ? 0 : 2);
+}
+
+static int
+parseprop(nvlist_t *props)
+{
+	char *propname = optarg;
+	char *propval, *strval;
+
+	if ((propval = strchr(propname, '=')) == NULL) {
+		(void) fprintf(stderr, gettext("missing "
+		    "'=' for -o option\n"));
+		return (-1);
+	}
+	*propval = '\0';
+	propval++;
+	if (nvlist_lookup_string(props, propname, &strval) == 0) {
+		(void) fprintf(stderr, gettext("property '%s' "
+		    "specified multiple times\n"), propname);
+		return (-1);
+	}
+	if (nvlist_add_string(props, propname, propval) != 0)
+		nomem();
+	return (0);
+}
+
+static int
+parse_depth(char *opt, int *flags)
+{
+	char *tmp;
+	int depth;
+
+	depth = (int)strtol(opt, &tmp, 0);
+	if (*tmp) {
+		(void) fprintf(stderr,
+		    gettext("%s is not an integer\n"), optarg);
+		usage(B_FALSE);
+	}
+	if (depth < 0) {
+		(void) fprintf(stderr,
+		    gettext("Depth can not be negative.\n"));
+		usage(B_FALSE);
+	}
+	*flags |= (ZFS_ITER_DEPTH_LIMIT|ZFS_ITER_RECURSE);
+	return (depth);
+}
+
+#define	PROGRESS_DELAY 2		/* seconds */
+
+static char *pt_reverse = "\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b";
+static time_t pt_begin;
+static char *pt_header = NULL;
+static boolean_t pt_shown;
+
+static void
+start_progress_timer(void)
+{
+	pt_begin = time(NULL) + PROGRESS_DELAY;
+	pt_shown = B_FALSE;
+}
+
+static void
+set_progress_header(char *header)
+{
+	assert(pt_header == NULL);
+	pt_header = safe_strdup(header);
+	if (pt_shown) {
+		(void) printf("%s: ", header);
+		(void) fflush(stdout);
+	}
+}
+
+static void
+update_progress(char *update)
+{
+	if (!pt_shown && time(NULL) > pt_begin) {
+		int len = strlen(update);
+
+		(void) printf("%s: %s%*.*s", pt_header, update, len, len,
+		    pt_reverse);
+		(void) fflush(stdout);
+		pt_shown = B_TRUE;
+	} else if (pt_shown) {
+		int len = strlen(update);
+
+		(void) printf("%s%*.*s", update, len, len, pt_reverse);
+		(void) fflush(stdout);
+	}
+}
+
+static void
+finish_progress(char *done)
+{
+	if (pt_shown) {
+		(void) printf("%s\n", done);
+		(void) fflush(stdout);
+	}
+	free(pt_header);
+	pt_header = NULL;
+}
+/*
+ * zfs clone [-p] [-o prop=value] ... <snap> <fs | vol>
+ *
+ * Given an existing dataset, create a writable copy whose initial contents
+ * are the same as the source.  The newly created dataset maintains a
+ * dependency on the original; the original cannot be destroyed so long as
+ * the clone exists.
+ *
+ * The '-p' flag creates all the non-existing ancestors of the target first.
+ */
+static int
+zfs_do_clone(int argc, char **argv)
+{
+	zfs_handle_t *zhp = NULL;
+	boolean_t parents = B_FALSE;
+	nvlist_t *props;
+	int ret = 0;
+	int c;
+
+	if (nvlist_alloc(&props, NV_UNIQUE_NAME, 0) != 0)
+		nomem();
+
+	/* check options */
+	while ((c = getopt(argc, argv, "o:p")) != -1) {
+		switch (c) {
+		case 'o':
+			if (parseprop(props))
+				return (1);
+			break;
+		case 'p':
+			parents = B_TRUE;
+			break;
+		case '?':
+			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
+			    optopt);
+			goto usage;
+		}
+	}
+
+	argc -= optind;
+	argv += optind;
+
+	/* check number of arguments */
+	if (argc < 1) {
+		(void) fprintf(stderr, gettext("missing source dataset "
+		    "argument\n"));
+		goto usage;
+	}
+	if (argc < 2) {
+		(void) fprintf(stderr, gettext("missing target dataset "
+		    "argument\n"));
+		goto usage;
+	}
+	if (argc > 2) {
+		(void) fprintf(stderr, gettext("too many arguments\n"));
+		goto usage;
+	}
+
+	/* open the source dataset */
+	if ((zhp = zfs_open(g_zfs, argv[0], ZFS_TYPE_SNAPSHOT)) == NULL)
+		return (1);
+
+	if (parents && zfs_name_valid(argv[1], ZFS_TYPE_FILESYSTEM |
+	    ZFS_TYPE_VOLUME)) {
+		/*
+		 * Now create the ancestors of the target dataset.  If the
+		 * target already exists and '-p' option was used we should not
+		 * complain.
+		 */
+		if (zfs_dataset_exists(g_zfs, argv[1], ZFS_TYPE_FILESYSTEM |
+		    ZFS_TYPE_VOLUME))
+			return (0);
+		if (zfs_create_ancestors(g_zfs, argv[1]) != 0)
+			return (1);
+	}
+
+	/* pass to libzfs */
+	ret = zfs_clone(zhp, argv[1], props);
+
+	/* create the mountpoint if necessary */
+	if (ret == 0) {
+		zfs_handle_t *clone;
+
+		clone = zfs_open(g_zfs, argv[1], ZFS_TYPE_DATASET);
+		if (clone != NULL) {
+			if (zfs_get_type(clone) != ZFS_TYPE_VOLUME)
+				if ((ret = zfs_mount(clone, NULL, 0)) == 0)
+					ret = zfs_share(clone);
+			zfs_close(clone);
+		}
+	}
+
+	zfs_close(zhp);
+	nvlist_free(props);
+
+	return (!!ret);
+
+usage:
+	if (zhp)
+		zfs_close(zhp);
+	nvlist_free(props);
+	usage(B_FALSE);
+	return (-1);
+}
+
+/*
+ * zfs create [-p] [-o prop=value] ... fs
+ * zfs create [-ps] [-b blocksize] [-o prop=value] ... -V vol size
+ *
+ * Create a new dataset.  This command can be used to create filesystems
+ * and volumes.  Snapshot creation is handled by 'zfs snapshot'.
+ * For volumes, the user must specify a size to be used.
+ *
+ * The '-s' flag applies only to volumes, and indicates that we should not try
+ * to set the reservation for this volume.  By default we set a reservation
+ * equal to the size for any volume.  For pools with SPA_VERSION >=
+ * SPA_VERSION_REFRESERVATION, we set a refreservation instead.
+ *
+ * The '-p' flag creates all the non-existing ancestors of the target first.
+ */
+static int
+zfs_do_create(int argc, char **argv)
+{
+	zfs_type_t type = ZFS_TYPE_FILESYSTEM;
+	zfs_handle_t *zhp = NULL;
+	uint64_t volsize;
+	int c;
+	boolean_t noreserve = B_FALSE;
+	boolean_t bflag = B_FALSE;
+	boolean_t parents = B_FALSE;
+	int ret = 1;
+	nvlist_t *props;
+	uint64_t intval;
+	int canmount = ZFS_CANMOUNT_OFF;
+
+	if (nvlist_alloc(&props, NV_UNIQUE_NAME, 0) != 0)
+		nomem();
+
+	/* check options */
+	while ((c = getopt(argc, argv, ":V:b:so:p")) != -1) {
+		switch (c) {
+		case 'V':
+			type = ZFS_TYPE_VOLUME;
+			if (zfs_nicestrtonum(g_zfs, optarg, &intval) != 0) {
+				(void) fprintf(stderr, gettext("bad volume "
+				    "size '%s': %s\n"), optarg,
+				    libzfs_error_description(g_zfs));
+				goto error;
+			}
+
+			if (nvlist_add_uint64(props,
+			    zfs_prop_to_name(ZFS_PROP_VOLSIZE), intval) != 0)
+				nomem();
+			volsize = intval;
+			break;
+		case 'p':
+			parents = B_TRUE;
+			break;
+		case 'b':
+			bflag = B_TRUE;
+			if (zfs_nicestrtonum(g_zfs, optarg, &intval) != 0) {
+				(void) fprintf(stderr, gettext("bad volume "
+				    "block size '%s': %s\n"), optarg,
+				    libzfs_error_description(g_zfs));
+				goto error;
+			}
+
+			if (nvlist_add_uint64(props,
+			    zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE),
+			    intval) != 0)
+				nomem();
+			break;
+		case 'o':
+			if (parseprop(props))
+				goto error;
+			break;
+		case 's':
+			noreserve = B_TRUE;
+			break;
+		case ':':
+			(void) fprintf(stderr, gettext("missing size "
+			    "argument\n"));
+			goto badusage;
+		case '?':
+			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
+			    optopt);
+			goto badusage;
+		}
+	}
+
+	if ((bflag || noreserve) && type != ZFS_TYPE_VOLUME) {
+		(void) fprintf(stderr, gettext("'-s' and '-b' can only be "
+		    "used when creating a volume\n"));
+		goto badusage;
+	}
+
+	argc -= optind;
+	argv += optind;
+
+	/* check number of arguments */
+	if (argc == 0) {
+		(void) fprintf(stderr, gettext("missing %s argument\n"),
+		    zfs_type_to_name(type));
+		goto badusage;
+	}
+	if (argc > 1) {
+		(void) fprintf(stderr, gettext("too many arguments\n"));
+		goto badusage;
+	}
+
+	if (type == ZFS_TYPE_VOLUME && !noreserve) {
+		zpool_handle_t *zpool_handle;
+		uint64_t spa_version;
+		char *p;
+		zfs_prop_t resv_prop;
+		char *strval;
+
+		if (p = strchr(argv[0], '/'))
+			*p = '\0';
+		zpool_handle = zpool_open(g_zfs, argv[0]);
+		if (p != NULL)
+			*p = '/';
+		if (zpool_handle == NULL)
+			goto error;
+		spa_version = zpool_get_prop_int(zpool_handle,
+		    ZPOOL_PROP_VERSION, NULL);
+		zpool_close(zpool_handle);
+		if (spa_version >= SPA_VERSION_REFRESERVATION)
+			resv_prop = ZFS_PROP_REFRESERVATION;
+		else
+			resv_prop = ZFS_PROP_RESERVATION;
+		volsize = zvol_volsize_to_reservation(volsize, props);
+
+		if (nvlist_lookup_string(props, zfs_prop_to_name(resv_prop),
+		    &strval) != 0) {
+			if (nvlist_add_uint64(props,
+			    zfs_prop_to_name(resv_prop), volsize) != 0) {
+				nvlist_free(props);
+				nomem();
+			}
+		}
+	}
+
+	if (parents && zfs_name_valid(argv[0], type)) {
+		/*
+		 * Now create the ancestors of target dataset.  If the target
+		 * already exists and '-p' option was used we should not
+		 * complain.
+		 */
+		if (zfs_dataset_exists(g_zfs, argv[0], type)) {
+			ret = 0;
+			goto error;
+		}
+		if (zfs_create_ancestors(g_zfs, argv[0]) != 0)
+			goto error;
+	}
+
+	/* pass to libzfs */
+	if (zfs_create(g_zfs, argv[0], type, props) != 0)
+		goto error;
+
+	if ((zhp = zfs_open(g_zfs, argv[0], ZFS_TYPE_DATASET)) == NULL)
+		goto error;
+
+	ret = 0;
+	/*
+	 * if the user doesn't want the dataset automatically mounted,
+	 * then skip the mount/share step
+	 */
+	if (zfs_prop_valid_for_type(ZFS_PROP_CANMOUNT, type))
+		canmount = zfs_prop_get_int(zhp, ZFS_PROP_CANMOUNT);
+
+	/*
+	 * Mount and/or share the new filesystem as appropriate.  We provide a
+	 * verbose error message to let the user know that their filesystem was
+	 * in fact created, even if we failed to mount or share it.
+	 */
+	if (canmount == ZFS_CANMOUNT_ON) {
+		if (zfs_mount(zhp, NULL, 0) != 0) {
+			(void) fprintf(stderr, gettext("filesystem "
+			    "successfully created, but not mounted\n"));
+			ret = 1;
+		} else if (zfs_share(zhp) != 0) {
+			(void) fprintf(stderr, gettext("filesystem "
+			    "successfully created, but not shared\n"));
+			ret = 1;
+		}
+	}
+
+error:
+	if (zhp)
+		zfs_close(zhp);
+	nvlist_free(props);
+	return (ret);
+badusage:
+	nvlist_free(props);
+	usage(B_FALSE);
+	return (2);
+}
+
+/*
+ * zfs destroy [-rRf] <fs, vol>
+ * zfs destroy [-rRd] <snap>
+ *
+ *	-r	Recursively destroy all children
+ *	-R	Recursively destroy all dependents, including clones
+ *	-f	Force unmounting of any dependents
+ *	-d	If we can't destroy now, mark for deferred destruction
+ *
+ * Destroys the given dataset.  By default, it will unmount any filesystems,
+ * and refuse to destroy a dataset that has any dependents.  A dependent can
+ * either be a child, or a clone of a child.
+ */
+typedef struct destroy_cbdata {
+	boolean_t	cb_first;
+	boolean_t	cb_force;
+	boolean_t	cb_recurse;
+	boolean_t	cb_error;
+	boolean_t	cb_doclones;
+	zfs_handle_t	*cb_target;
+	boolean_t	cb_defer_destroy;
+	boolean_t	cb_verbose;
+	boolean_t	cb_parsable;
+	boolean_t	cb_dryrun;
+	nvlist_t	*cb_nvl;
+
+	/* first snap in contiguous run */
+	zfs_handle_t	*cb_firstsnap;
+	/* previous snap in contiguous run */
+	zfs_handle_t	*cb_prevsnap;
+	int64_t		cb_snapused;
+	char		*cb_snapspec;
+} destroy_cbdata_t;
+
+/*
+ * Check for any dependents based on the '-r' or '-R' flags.
+ */
+static int
+destroy_check_dependent(zfs_handle_t *zhp, void *data)
+{
+	destroy_cbdata_t *cbp = data;
+	const char *tname = zfs_get_name(cbp->cb_target);
+	const char *name = zfs_get_name(zhp);
+
+	if (strncmp(tname, name, strlen(tname)) == 0 &&
+	    (name[strlen(tname)] == '/' || name[strlen(tname)] == '@')) {
+		/*
+		 * This is a direct descendant, not a clone somewhere else in
+		 * the hierarchy.
+		 */
+		if (cbp->cb_recurse)
+			goto out;
+
+		if (cbp->cb_first) {
+			(void) fprintf(stderr, gettext("cannot destroy '%s': "
+			    "%s has children\n"),
+			    zfs_get_name(cbp->cb_target),
+			    zfs_type_to_name(zfs_get_type(cbp->cb_target)));
+			(void) fprintf(stderr, gettext("use '-r' to destroy "
+			    "the following datasets:\n"));
+			cbp->cb_first = B_FALSE;
+			cbp->cb_error = B_TRUE;
+		}
+
+		(void) fprintf(stderr, "%s\n", zfs_get_name(zhp));
+	} else {
+		/*
+		 * This is a clone.  We only want to report this if the '-r'
+		 * wasn't specified, or the target is a snapshot.
+		 */
+		if (!cbp->cb_recurse &&
+		    zfs_get_type(cbp->cb_target) != ZFS_TYPE_SNAPSHOT)
+			goto out;
+
+		if (cbp->cb_first) {
+			(void) fprintf(stderr, gettext("cannot destroy '%s': "
+			    "%s has dependent clones\n"),
+			    zfs_get_name(cbp->cb_target),
+			    zfs_type_to_name(zfs_get_type(cbp->cb_target)));
+			(void) fprintf(stderr, gettext("use '-R' to destroy "
+			    "the following datasets:\n"));
+			cbp->cb_first = B_FALSE;
+			cbp->cb_error = B_TRUE;
+			cbp->cb_dryrun = B_TRUE;
+		}
+
+		(void) fprintf(stderr, "%s\n", zfs_get_name(zhp));
+	}
+
+out:
+	zfs_close(zhp);
+	return (0);
+}
+
+static int
+destroy_callback(zfs_handle_t *zhp, void *data)
+{
+	destroy_cbdata_t *cb = data;
+	const char *name = zfs_get_name(zhp);
+
+	if (cb->cb_verbose) {
+		if (cb->cb_parsable) {
+			(void) printf("destroy\t%s\n", name);
+		} else if (cb->cb_dryrun) {
+			(void) printf(gettext("would destroy %s\n"),
+			    name);
+		} else {
+			(void) printf(gettext("will destroy %s\n"),
+			    name);
+		}
+	}
+
+	/*
+	 * Ignore pools (which we've already flagged as an error before getting
+	 * here).
+	 */
+	if (strchr(zfs_get_name(zhp), '/') == NULL &&
+	    zfs_get_type(zhp) == ZFS_TYPE_FILESYSTEM) {
+		zfs_close(zhp);
+		return (0);
+	}
+
+	if (!cb->cb_dryrun) {
+		if (zfs_unmount(zhp, NULL, cb->cb_force ? MS_FORCE : 0) != 0 ||
+		    zfs_destroy(zhp, cb->cb_defer_destroy) != 0) {
+			zfs_close(zhp);
+			return (-1);
+		}
+	}
+
+	zfs_close(zhp);
+	return (0);
+}
+
+static int
+destroy_print_cb(zfs_handle_t *zhp, void *arg)
+{
+	destroy_cbdata_t *cb = arg;
+	const char *name = zfs_get_name(zhp);
+	int err = 0;
+
+	if (nvlist_exists(cb->cb_nvl, name)) {
+		if (cb->cb_firstsnap == NULL)
+			cb->cb_firstsnap = zfs_handle_dup(zhp);
+		if (cb->cb_prevsnap != NULL)
+			zfs_close(cb->cb_prevsnap);
+		/* this snap continues the current range */
+		cb->cb_prevsnap = zfs_handle_dup(zhp);
+		if (cb->cb_verbose) {
+			if (cb->cb_parsable) {
+				(void) printf("destroy\t%s\n", name);
+			} else if (cb->cb_dryrun) {
+				(void) printf(gettext("would destroy %s\n"),
+				    name);
+			} else {
+				(void) printf(gettext("will destroy %s\n"),
+				    name);
+			}
+		}
+	} else if (cb->cb_firstsnap != NULL) {
+		/* end of this range */
+		uint64_t used = 0;
+		err = zfs_get_snapused_int(cb->cb_firstsnap,
+		    cb->cb_prevsnap, &used);
+		cb->cb_snapused += used;
+		zfs_close(cb->cb_firstsnap);
+		cb->cb_firstsnap = NULL;
+		zfs_close(cb->cb_prevsnap);
+		cb->cb_prevsnap = NULL;
+	}
+	zfs_close(zhp);
+	return (err);
+}
+
+static int
+destroy_print_snapshots(zfs_handle_t *fs_zhp, destroy_cbdata_t *cb)
+{
+	int err = 0;
+	assert(cb->cb_firstsnap == NULL);
+	assert(cb->cb_prevsnap == NULL);
+	err = zfs_iter_snapshots_sorted(fs_zhp, destroy_print_cb, cb);
+	if (cb->cb_firstsnap != NULL) {
+		uint64_t used = 0;
+		if (err == 0) {
+			err = zfs_get_snapused_int(cb->cb_firstsnap,
+			    cb->cb_prevsnap, &used);
+		}
+		cb->cb_snapused += used;
+		zfs_close(cb->cb_firstsnap);
+		cb->cb_firstsnap = NULL;
+		zfs_close(cb->cb_prevsnap);
+		cb->cb_prevsnap = NULL;
+	}
+	return (err);
+}
+
+static int
+snapshot_to_nvl_cb(zfs_handle_t *zhp, void *arg)
+{
+	destroy_cbdata_t *cb = arg;
+	int err = 0;
+
+	/* Check for clones. */
+	if (!cb->cb_doclones) {
+		cb->cb_target = zhp;
+		cb->cb_first = B_TRUE;
+		err = zfs_iter_dependents(zhp, B_TRUE,
+		    destroy_check_dependent, cb);
+	}
+
+	if (err == 0) {
+		if (nvlist_add_boolean(cb->cb_nvl, zfs_get_name(zhp)))
+			nomem();
+	}
+	zfs_close(zhp);
+	return (err);
+}
+
+static int
+gather_snapshots(zfs_handle_t *zhp, void *arg)
+{
+	destroy_cbdata_t *cb = arg;
+	int err = 0;
+
+	err = zfs_iter_snapspec(zhp, cb->cb_snapspec, snapshot_to_nvl_cb, cb);
+	if (err == ENOENT)
+		err = 0;
+	if (err != 0)
+		goto out;
+
+	if (cb->cb_verbose) {
+		err = destroy_print_snapshots(zhp, cb);
+		if (err != 0)
+			goto out;
+	}
+
+	if (cb->cb_recurse)
+		err = zfs_iter_filesystems(zhp, gather_snapshots, cb);
+
+out:
+	zfs_close(zhp);
+	return (err);
+}
+
+static int
+destroy_clones(destroy_cbdata_t *cb)
+{
+	nvpair_t *pair;
+	for (pair = nvlist_next_nvpair(cb->cb_nvl, NULL);
+	    pair != NULL;
+	    pair = nvlist_next_nvpair(cb->cb_nvl, pair)) {
+		zfs_handle_t *zhp = zfs_open(g_zfs, nvpair_name(pair),
+		    ZFS_TYPE_SNAPSHOT);
+		if (zhp != NULL) {
+			boolean_t defer = cb->cb_defer_destroy;
+			int err = 0;
+
+			/*
+			 * We can't defer destroy non-snapshots, so set it to
+			 * false while destroying the clones.
+			 */
+			cb->cb_defer_destroy = B_FALSE;
+			err = zfs_iter_dependents(zhp, B_FALSE,
+			    destroy_callback, cb);
+			cb->cb_defer_destroy = defer;
+			zfs_close(zhp);
+			if (err != 0)
+				return (err);
+		}
+	}
+	return (0);
+}
+
+static int
+zfs_do_destroy(int argc, char **argv)
+{
+	destroy_cbdata_t cb = { 0 };
+	int c;
+	zfs_handle_t *zhp;
+	char *at;
+	zfs_type_t type = ZFS_TYPE_DATASET;
+
+	/* check options */
+	while ((c = getopt(argc, argv, "vpndfrR")) != -1) {
+		switch (c) {
+		case 'v':
+			cb.cb_verbose = B_TRUE;
+			break;
+		case 'p':
+			cb.cb_verbose = B_TRUE;
+			cb.cb_parsable = B_TRUE;
+			break;
+		case 'n':
+			cb.cb_dryrun = B_TRUE;
+			break;
+		case 'd':
+			cb.cb_defer_destroy = B_TRUE;
+			type = ZFS_TYPE_SNAPSHOT;
+			break;
+		case 'f':
+			cb.cb_force = B_TRUE;
+			break;
+		case 'r':
+			cb.cb_recurse = B_TRUE;
+			break;
+		case 'R':
+			cb.cb_recurse = B_TRUE;
+			cb.cb_doclones = B_TRUE;
+			break;
+		case '?':
+		default:
+			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
+			    optopt);
+			usage(B_FALSE);
+		}
+	}
+
+	argc -= optind;
+	argv += optind;
+
+	/* check number of arguments */
+	if (argc == 0) {
+		(void) fprintf(stderr, gettext("missing dataset argument\n"));
+		usage(B_FALSE);
+	}
+	if (argc > 1) {
+		(void) fprintf(stderr, gettext("too many arguments\n"));
+		usage(B_FALSE);
+	}
+
+	at = strchr(argv[0], '@');
+	if (at != NULL) {
+		int err = 0;
+
+		/* Build the list of snaps to destroy in cb_nvl. */
+		if (nvlist_alloc(&cb.cb_nvl, NV_UNIQUE_NAME, 0) != 0)
+			nomem();
+
+		*at = '\0';
+		zhp = zfs_open(g_zfs, argv[0],
+		    ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME);
+		if (zhp == NULL)
+			return (1);
+
+		cb.cb_snapspec = at + 1;
+		if (gather_snapshots(zfs_handle_dup(zhp), &cb) != 0 ||
+		    cb.cb_error) {
+			zfs_close(zhp);
+			nvlist_free(cb.cb_nvl);
+			return (1);
+		}
+
+		if (nvlist_empty(cb.cb_nvl)) {
+			(void) fprintf(stderr, gettext("could not find any "
+			    "snapshots to destroy; check snapshot names.\n"));
+			zfs_close(zhp);
+			nvlist_free(cb.cb_nvl);
+			return (1);
+		}
+
+		if (cb.cb_verbose) {
+			char buf[16];
+			zfs_nicenum(cb.cb_snapused, buf, sizeof (buf));
+			if (cb.cb_parsable) {
+				(void) printf("reclaim\t%llu\n",
+				    cb.cb_snapused);
+			} else if (cb.cb_dryrun) {
+				(void) printf(gettext("would reclaim %s\n"),
+				    buf);
+			} else {
+				(void) printf(gettext("will reclaim %s\n"),
+				    buf);
+			}
+		}
+
+		if (!cb.cb_dryrun) {
+			if (cb.cb_doclones)
+				err = destroy_clones(&cb);
+			if (err == 0) {
+				err = zfs_destroy_snaps_nvl(zhp, cb.cb_nvl,
+				    cb.cb_defer_destroy);
+			}
+		}
+
+		zfs_close(zhp);
+		nvlist_free(cb.cb_nvl);
+		if (err != 0)
+			return (1);
+	} else {
+		/* Open the given dataset */
+		if ((zhp = zfs_open(g_zfs, argv[0], type)) == NULL)
+			return (1);
+
+		cb.cb_target = zhp;
+
+		/*
+		 * Perform an explicit check for pools before going any further.
+		 */
+		if (!cb.cb_recurse && strchr(zfs_get_name(zhp), '/') == NULL &&
+		    zfs_get_type(zhp) == ZFS_TYPE_FILESYSTEM) {
+			(void) fprintf(stderr, gettext("cannot destroy '%s': "
+			    "operation does not apply to pools\n"),
+			    zfs_get_name(zhp));
+			(void) fprintf(stderr, gettext("use 'zfs destroy -r "
+			    "%s' to destroy all datasets in the pool\n"),
+			    zfs_get_name(zhp));
+			(void) fprintf(stderr, gettext("use 'zpool destroy %s' "
+			    "to destroy the pool itself\n"), zfs_get_name(zhp));
+			zfs_close(zhp);
+			return (1);
+		}
+
+		/*
+		 * Check for any dependents and/or clones.
+		 */
+		cb.cb_first = B_TRUE;
+		if (!cb.cb_doclones &&
+		    zfs_iter_dependents(zhp, B_TRUE, destroy_check_dependent,
+		    &cb) != 0) {
+			zfs_close(zhp);
+			return (1);
+		}
+
+		if (cb.cb_error) {
+			zfs_close(zhp);
+			return (1);
+		}
+
+		if (zfs_iter_dependents(zhp, B_FALSE, destroy_callback,
+		    &cb) != 0) {
+			zfs_close(zhp);
+			return (1);
+		}
+
+		/*
+		 * Do the real thing.  The callback will close the
+		 * handle regardless of whether it succeeds or not.
+		 */
+		if (destroy_callback(zhp, &cb) != 0)
+			return (1);
+	}
+
+	return (0);
+}
+
+static boolean_t
+is_recvd_column(zprop_get_cbdata_t *cbp)
+{
+	int i;
+	zfs_get_column_t col;
+
+	for (i = 0; i < ZFS_GET_NCOLS &&
+	    (col = cbp->cb_columns[i]) != GET_COL_NONE; i++)
+		if (col == GET_COL_RECVD)
+			return (B_TRUE);
+	return (B_FALSE);
+}
+
+/*
+ * zfs get [-rHp] [-o all | field[,field]...] [-s source[,source]...]
+ *	< all | property[,property]... > < fs | snap | vol > ...
+ *
+ *	-r	recurse over any child datasets
+ *	-H	scripted mode.  Headers are stripped, and fields are separated
+ *		by tabs instead of spaces.
+ *	-o	Set of fields to display.  One of "name,property,value,
+ *		received,source". Default is "name,property,value,source".
+ *		"all" is an alias for all five.
+ *	-s	Set of sources to allow.  One of
+ *		"local,default,inherited,received,temporary,none".  Default is
+ *		all six.
+ *	-p	Display values in parsable (literal) format.
+ *
+ *  Prints properties for the given datasets.  The user can control which
+ *  columns to display as well as which property types to allow.
+ */
+
+/*
+ * Invoked to display the properties for a single dataset.
+ */
+static int
+get_callback(zfs_handle_t *zhp, void *data)
+{
+	char buf[ZFS_MAXPROPLEN];
+	char rbuf[ZFS_MAXPROPLEN];
+	zprop_source_t sourcetype;
+	char source[ZFS_MAXNAMELEN];
+	zprop_get_cbdata_t *cbp = data;
+	nvlist_t *user_props = zfs_get_user_props(zhp);
+	zprop_list_t *pl = cbp->cb_proplist;
+	nvlist_t *propval;
+	char *strval;
+	char *sourceval;
+	boolean_t received = is_recvd_column(cbp);
+
+	for (; pl != NULL; pl = pl->pl_next) {
+		char *recvdval = NULL;
+		/*
+		 * Skip the special fake placeholder.  This will also skip over
+		 * the name property when 'all' is specified.
+		 */
+		if (pl->pl_prop == ZFS_PROP_NAME &&
+		    pl == cbp->cb_proplist)
+			continue;
+
+		if (pl->pl_prop != ZPROP_INVAL) {
+			if (zfs_prop_get(zhp, pl->pl_prop, buf,
+			    sizeof (buf), &sourcetype, source,
+			    sizeof (source),
+			    cbp->cb_literal) != 0) {
+				if (pl->pl_all)
+					continue;
+				if (!zfs_prop_valid_for_type(pl->pl_prop,
+				    ZFS_TYPE_DATASET)) {
+					(void) fprintf(stderr,
+					    gettext("No such property '%s'\n"),
+					    zfs_prop_to_name(pl->pl_prop));
+					continue;
+				}
+				sourcetype = ZPROP_SRC_NONE;
+				(void) strlcpy(buf, "-", sizeof (buf));
+			}
+
+			if (received && (zfs_prop_get_recvd(zhp,
+			    zfs_prop_to_name(pl->pl_prop), rbuf, sizeof (rbuf),
+			    cbp->cb_literal) == 0))
+				recvdval = rbuf;
+
+			zprop_print_one_property(zfs_get_name(zhp), cbp,
+			    zfs_prop_to_name(pl->pl_prop),
+			    buf, sourcetype, source, recvdval);
+		} else if (zfs_prop_userquota(pl->pl_user_prop)) {
+			sourcetype = ZPROP_SRC_LOCAL;
+
+			if (zfs_prop_get_userquota(zhp, pl->pl_user_prop,
+			    buf, sizeof (buf), cbp->cb_literal) != 0) {
+				sourcetype = ZPROP_SRC_NONE;
+				(void) strlcpy(buf, "-", sizeof (buf));
+			}
+
+			zprop_print_one_property(zfs_get_name(zhp), cbp,
+			    pl->pl_user_prop, buf, sourcetype, source, NULL);
+		} else if (zfs_prop_written(pl->pl_user_prop)) {
+			sourcetype = ZPROP_SRC_LOCAL;
+
+			if (zfs_prop_get_written(zhp, pl->pl_user_prop,
+			    buf, sizeof (buf), cbp->cb_literal) != 0) {
+				sourcetype = ZPROP_SRC_NONE;
+				(void) strlcpy(buf, "-", sizeof (buf));
+			}
+
+			zprop_print_one_property(zfs_get_name(zhp), cbp,
+			    pl->pl_user_prop, buf, sourcetype, source, NULL);
+		} else {
+			if (nvlist_lookup_nvlist(user_props,
+			    pl->pl_user_prop, &propval) != 0) {
+				if (pl->pl_all)
+					continue;
+				sourcetype = ZPROP_SRC_NONE;
+				strval = "-";
+			} else {
+				verify(nvlist_lookup_string(propval,
+				    ZPROP_VALUE, &strval) == 0);
+				verify(nvlist_lookup_string(propval,
+				    ZPROP_SOURCE, &sourceval) == 0);
+
+				if (strcmp(sourceval,
+				    zfs_get_name(zhp)) == 0) {
+					sourcetype = ZPROP_SRC_LOCAL;
+				} else if (strcmp(sourceval,
+				    ZPROP_SOURCE_VAL_RECVD) == 0) {
+					sourcetype = ZPROP_SRC_RECEIVED;
+				} else {
+					sourcetype = ZPROP_SRC_INHERITED;
+					(void) strlcpy(source,
+					    sourceval, sizeof (source));
+				}
+			}
+
+			if (received && (zfs_prop_get_recvd(zhp,
+			    pl->pl_user_prop, rbuf, sizeof (rbuf),
+			    cbp->cb_literal) == 0))
+				recvdval = rbuf;
+
+			zprop_print_one_property(zfs_get_name(zhp), cbp,
+			    pl->pl_user_prop, strval, sourcetype,
+			    source, recvdval);
+		}
+	}
+
+	return (0);
+}
+
+static int
+zfs_do_get(int argc, char **argv)
+{
+	zprop_get_cbdata_t cb = { 0 };
+	int i, c, flags = ZFS_ITER_ARGS_CAN_BE_PATHS;
+	int types = ZFS_TYPE_DATASET;
+	char *value, *fields;
+	int ret = 0;
+	int limit = 0;
+	zprop_list_t fake_name = { 0 };
+
+	/*
+	 * Set up default columns and sources.
+	 */
+	cb.cb_sources = ZPROP_SRC_ALL;
+	cb.cb_columns[0] = GET_COL_NAME;
+	cb.cb_columns[1] = GET_COL_PROPERTY;
+	cb.cb_columns[2] = GET_COL_VALUE;
+	cb.cb_columns[3] = GET_COL_SOURCE;
+	cb.cb_type = ZFS_TYPE_DATASET;
+
+	/* check options */
+	while ((c = getopt(argc, argv, ":d:o:s:rt:Hp")) != -1) {
+		switch (c) {
+		case 'p':
+			cb.cb_literal = B_TRUE;
+			break;
+		case 'd':
+			limit = parse_depth(optarg, &flags);
+			break;
+		case 'r':
+			flags |= ZFS_ITER_RECURSE;
+			break;
+		case 'H':
+			cb.cb_scripted = B_TRUE;
+			break;
+		case ':':
+			(void) fprintf(stderr, gettext("missing argument for "
+			    "'%c' option\n"), optopt);
+			usage(B_FALSE);
+			break;
+		case 'o':
+			/*
+			 * Process the set of columns to display.  We zero out
+			 * the structure to give us a blank slate.
+			 */
+			bzero(&cb.cb_columns, sizeof (cb.cb_columns));
+			i = 0;
+			while (*optarg != '\0') {
+				static char *col_subopts[] =
+				    { "name", "property", "value", "received",
+				    "source", "all", NULL };
+
+				if (i == ZFS_GET_NCOLS) {
+					(void) fprintf(stderr, gettext("too "
+					    "many fields given to -o "
+					    "option\n"));
+					usage(B_FALSE);
+				}
+
+				switch (getsubopt(&optarg, col_subopts,
+				    &value)) {
+				case 0:
+					cb.cb_columns[i++] = GET_COL_NAME;
+					break;
+				case 1:
+					cb.cb_columns[i++] = GET_COL_PROPERTY;
+					break;
+				case 2:
+					cb.cb_columns[i++] = GET_COL_VALUE;
+					break;
+				case 3:
+					cb.cb_columns[i++] = GET_COL_RECVD;
+					flags |= ZFS_ITER_RECVD_PROPS;
+					break;
+				case 4:
+					cb.cb_columns[i++] = GET_COL_SOURCE;
+					break;
+				case 5:
+					if (i > 0) {
+						(void) fprintf(stderr,
+						    gettext("\"all\" conflicts "
+						    "with specific fields "
+						    "given to -o option\n"));
+						usage(B_FALSE);
+					}
+					cb.cb_columns[0] = GET_COL_NAME;
+					cb.cb_columns[1] = GET_COL_PROPERTY;
+					cb.cb_columns[2] = GET_COL_VALUE;
+					cb.cb_columns[3] = GET_COL_RECVD;
+					cb.cb_columns[4] = GET_COL_SOURCE;
+					flags |= ZFS_ITER_RECVD_PROPS;
+					i = ZFS_GET_NCOLS;
+					break;
+				default:
+					(void) fprintf(stderr,
+					    gettext("invalid column name "
+					    "'%s'\n"), value);
+					usage(B_FALSE);
+				}
+			}
+			break;
+
+		case 's':
+			cb.cb_sources = 0;
+			while (*optarg != '\0') {
+				static char *source_subopts[] = {
+					"local", "default", "inherited",
+					"received", "temporary", "none",
+					NULL };
+
+				switch (getsubopt(&optarg, source_subopts,
+				    &value)) {
+				case 0:
+					cb.cb_sources |= ZPROP_SRC_LOCAL;
+					break;
+				case 1:
+					cb.cb_sources |= ZPROP_SRC_DEFAULT;
+					break;
+				case 2:
+					cb.cb_sources |= ZPROP_SRC_INHERITED;
+					break;
+				case 3:
+					cb.cb_sources |= ZPROP_SRC_RECEIVED;
+					break;
+				case 4:
+					cb.cb_sources |= ZPROP_SRC_TEMPORARY;
+					break;
+				case 5:
+					cb.cb_sources |= ZPROP_SRC_NONE;
+					break;
+				default:
+					(void) fprintf(stderr,
+					    gettext("invalid source "
+					    "'%s'\n"), value);
+					usage(B_FALSE);
+				}
+			}
+			break;
+
+		case 't':
+			types = 0;
+			flags &= ~ZFS_ITER_PROP_LISTSNAPS;
+			while (*optarg != '\0') {
+				static char *type_subopts[] = { "filesystem",
+				    "volume", "snapshot", "all", NULL };
+
+				switch (getsubopt(&optarg, type_subopts,
+				    &value)) {
+				case 0:
+					types |= ZFS_TYPE_FILESYSTEM;
+					break;
+				case 1:
+					types |= ZFS_TYPE_VOLUME;
+					break;
+				case 2:
+					types |= ZFS_TYPE_SNAPSHOT;
+					break;
+				case 3:
+					types = ZFS_TYPE_DATASET;
+					break;
+
+				default:
+					(void) fprintf(stderr,
+					    gettext("invalid type '%s'\n"),
+					    value);
+					usage(B_FALSE);
+				}
+			}
+			break;
+
+		case '?':
+			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
+			    optopt);
+			usage(B_FALSE);
+		}
+	}
+
+	argc -= optind;
+	argv += optind;
+
+	if (argc < 1) {
+		(void) fprintf(stderr, gettext("missing property "
+		    "argument\n"));
+		usage(B_FALSE);
+	}
+
+	fields = argv[0];
+
+	if (zprop_get_list(g_zfs, fields, &cb.cb_proplist, ZFS_TYPE_DATASET)
+	    != 0)
+		usage(B_FALSE);
+
+	argc--;
+	argv++;
+
+	/*
+	 * As part of zfs_expand_proplist(), we keep track of the maximum column
+	 * width for each property.  For the 'NAME' (and 'SOURCE') columns, we
+	 * need to know the maximum name length.  However, the user likely did
+	 * not specify 'name' as one of the properties to fetch, so we need to
+	 * make sure we always include at least this property for
+	 * print_get_headers() to work properly.
+	 */
+	if (cb.cb_proplist != NULL) {
+		fake_name.pl_prop = ZFS_PROP_NAME;
+		fake_name.pl_width = strlen(gettext("NAME"));
+		fake_name.pl_next = cb.cb_proplist;
+		cb.cb_proplist = &fake_name;
+	}
+
+	cb.cb_first = B_TRUE;
+
+	/* run for each object */
+	ret = zfs_for_each(argc, argv, flags, types, NULL,
+	    &cb.cb_proplist, limit, get_callback, &cb);
+
+	if (cb.cb_proplist == &fake_name)
+		zprop_free_list(fake_name.pl_next);
+	else
+		zprop_free_list(cb.cb_proplist);
+
+	return (ret);
+}
+
+/*
+ * inherit [-rS] <property> <fs|vol> ...
+ *
+ *	-r	Recurse over all children
+ *	-S	Revert to received value, if any
+ *
+ * For each dataset specified on the command line, inherit the given property
+ * from its parent.  Inheriting a property at the pool level will cause it to
+ * use the default value.  The '-r' flag will recurse over all children, and is
+ * useful for setting a property on a hierarchy-wide basis, regardless of any
+ * local modifications for each dataset.
+ */
+
+typedef struct inherit_cbdata {
+	const char *cb_propname;
+	boolean_t cb_received;
+} inherit_cbdata_t;
+
+static int
+inherit_recurse_cb(zfs_handle_t *zhp, void *data)
+{
+	inherit_cbdata_t *cb = data;
+	zfs_prop_t prop = zfs_name_to_prop(cb->cb_propname);
+
+	/*
+	 * If we're doing it recursively, then ignore properties that
+	 * are not valid for this type of dataset.
+	 */
+	if (prop != ZPROP_INVAL &&
+	    !zfs_prop_valid_for_type(prop, zfs_get_type(zhp)))
+		return (0);
+
+	return (zfs_prop_inherit(zhp, cb->cb_propname, cb->cb_received) != 0);
+}
+
+static int
+inherit_cb(zfs_handle_t *zhp, void *data)
+{
+	inherit_cbdata_t *cb = data;
+
+	return (zfs_prop_inherit(zhp, cb->cb_propname, cb->cb_received) != 0);
+}
+
+static int
+zfs_do_inherit(int argc, char **argv)
+{
+	int c;
+	zfs_prop_t prop;
+	inherit_cbdata_t cb = { 0 };
+	char *propname;
+	int ret = 0;
+	int flags = 0;
+	boolean_t received = B_FALSE;
+
+	/* check options */
+	while ((c = getopt(argc, argv, "rS")) != -1) {
+		switch (c) {
+		case 'r':
+			flags |= ZFS_ITER_RECURSE;
+			break;
+		case 'S':
+			received = B_TRUE;
+			break;
+		case '?':
+		default:
+			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
+			    optopt);
+			usage(B_FALSE);
+		}
+	}
+
+	argc -= optind;
+	argv += optind;
+
+	/* check number of arguments */
+	if (argc < 1) {
+		(void) fprintf(stderr, gettext("missing property argument\n"));
+		usage(B_FALSE);
+	}
+	if (argc < 2) {
+		(void) fprintf(stderr, gettext("missing dataset argument\n"));
+		usage(B_FALSE);
+	}
+
+	propname = argv[0];
+	argc--;
+	argv++;
+
+	if ((prop = zfs_name_to_prop(propname)) != ZPROP_INVAL) {
+		if (zfs_prop_readonly(prop)) {
+			(void) fprintf(stderr, gettext(
+			    "%s property is read-only\n"),
+			    propname);
+			return (1);
+		}
+		if (!zfs_prop_inheritable(prop) && !received) {
+			(void) fprintf(stderr, gettext("'%s' property cannot "
+			    "be inherited\n"), propname);
+			if (prop == ZFS_PROP_QUOTA ||
+			    prop == ZFS_PROP_RESERVATION ||
+			    prop == ZFS_PROP_REFQUOTA ||
+			    prop == ZFS_PROP_REFRESERVATION)
+				(void) fprintf(stderr, gettext("use 'zfs set "
+				    "%s=none' to clear\n"), propname);
+			return (1);
+		}
+		if (received && (prop == ZFS_PROP_VOLSIZE ||
+		    prop == ZFS_PROP_VERSION)) {
+			(void) fprintf(stderr, gettext("'%s' property cannot "
+			    "be reverted to a received value\n"), propname);
+			return (1);
+		}
+	} else if (!zfs_prop_user(propname)) {
+		(void) fprintf(stderr, gettext("invalid property '%s'\n"),
+		    propname);
+		usage(B_FALSE);
+	}
+
+	cb.cb_propname = propname;
+	cb.cb_received = received;
+
+	if (flags & ZFS_ITER_RECURSE) {
+		ret = zfs_for_each(argc, argv, flags, ZFS_TYPE_DATASET,
+		    NULL, NULL, 0, inherit_recurse_cb, &cb);
+	} else {
+		ret = zfs_for_each(argc, argv, flags, ZFS_TYPE_DATASET,
+		    NULL, NULL, 0, inherit_cb, &cb);
+	}
+
+	return (ret);
+}
+
+typedef struct upgrade_cbdata {
+	uint64_t cb_numupgraded;
+	uint64_t cb_numsamegraded;
+	uint64_t cb_numfailed;
+	uint64_t cb_version;
+	boolean_t cb_newer;
+	boolean_t cb_foundone;
+	char cb_lastfs[ZFS_MAXNAMELEN];
+} upgrade_cbdata_t;
+
+static int
+same_pool(zfs_handle_t *zhp, const char *name)
+{
+	int len1 = strcspn(name, "/@");
+	const char *zhname = zfs_get_name(zhp);
+	int len2 = strcspn(zhname, "/@");
+
+	if (len1 != len2)
+		return (B_FALSE);
+	return (strncmp(name, zhname, len1) == 0);
+}
+
+static int
+upgrade_list_callback(zfs_handle_t *zhp, void *data)
+{
+	upgrade_cbdata_t *cb = data;
+	int version = zfs_prop_get_int(zhp, ZFS_PROP_VERSION);
+
+	/* list if it's old/new */
+	if ((!cb->cb_newer && version < ZPL_VERSION) ||
+	    (cb->cb_newer && version > ZPL_VERSION)) {
+		char *str;
+		if (cb->cb_newer) {
+			str = gettext("The following filesystems are "
+			    "formatted using a newer software version and\n"
+			    "cannot be accessed on the current system.\n\n");
+		} else {
+			str = gettext("The following filesystems are "
+			    "out of date, and can be upgraded.  After being\n"
+			    "upgraded, these filesystems (and any 'zfs send' "
+			    "streams generated from\n"
+			    "subsequent snapshots) will no longer be "
+			    "accessible by older software versions.\n\n");
+		}
+
+		if (!cb->cb_foundone) {
+			(void) puts(str);
+			(void) printf(gettext("VER  FILESYSTEM\n"));
+			(void) printf(gettext("---  ------------\n"));
+			cb->cb_foundone = B_TRUE;
+		}
+
+		(void) printf("%2u   %s\n", version, zfs_get_name(zhp));
+	}
+
+	return (0);
+}
+
+static int
+upgrade_set_callback(zfs_handle_t *zhp, void *data)
+{
+	upgrade_cbdata_t *cb = data;
+	int version = zfs_prop_get_int(zhp, ZFS_PROP_VERSION);
+	int needed_spa_version;
+	int spa_version;
+
+	if (zfs_spa_version(zhp, &spa_version) < 0)
+		return (-1);
+
+	needed_spa_version = zfs_spa_version_map(cb->cb_version);
+
+	if (needed_spa_version < 0)
+		return (-1);
+
+	if (spa_version < needed_spa_version) {
+		/* can't upgrade */
+		(void) printf(gettext("%s: can not be "
+		    "upgraded; the pool version needs to first "
+		    "be upgraded\nto version %d\n\n"),
+		    zfs_get_name(zhp), needed_spa_version);
+		cb->cb_numfailed++;
+		return (0);
+	}
+
+	/* upgrade */
+	if (version < cb->cb_version) {
+		char verstr[16];
+		(void) snprintf(verstr, sizeof (verstr),
+		    "%llu", cb->cb_version);
+		if (cb->cb_lastfs[0] && !same_pool(zhp, cb->cb_lastfs)) {
+			/*
+			 * If they did "zfs upgrade -a", then we could
+			 * be doing ioctls to different pools.  We need
+			 * to log this history once to each pool.
+			 */
+			verify(zpool_stage_history(g_zfs, history_str) == 0);
+		}
+		if (zfs_prop_set(zhp, "version", verstr) == 0)
+			cb->cb_numupgraded++;
+		else
+			cb->cb_numfailed++;
+		(void) strcpy(cb->cb_lastfs, zfs_get_name(zhp));
+	} else if (version > cb->cb_version) {
+		/* can't downgrade */
+		(void) printf(gettext("%s: can not be downgraded; "
+		    "it is already at version %u\n"),
+		    zfs_get_name(zhp), version);
+		cb->cb_numfailed++;
+	} else {
+		cb->cb_numsamegraded++;
+	}
+	return (0);
+}
+
+/*
+ * zfs upgrade
+ * zfs upgrade -v
+ * zfs upgrade [-r] [-V <version>] <-a | filesystem>
+ */
+static int
+zfs_do_upgrade(int argc, char **argv)
+{
+	boolean_t all = B_FALSE;
+	boolean_t showversions = B_FALSE;
+	int ret = 0;
+	upgrade_cbdata_t cb = { 0 };
+	char c;
+	int flags = ZFS_ITER_ARGS_CAN_BE_PATHS;
+
+	/* check options */
+	while ((c = getopt(argc, argv, "rvV:a")) != -1) {
+		switch (c) {
+		case 'r':
+			flags |= ZFS_ITER_RECURSE;
+			break;
+		case 'v':
+			showversions = B_TRUE;
+			break;
+		case 'V':
+			if (zfs_prop_string_to_index(ZFS_PROP_VERSION,
+			    optarg, &cb.cb_version) != 0) {
+				(void) fprintf(stderr,
+				    gettext("invalid version %s\n"), optarg);
+				usage(B_FALSE);
+			}
+			break;
+		case 'a':
+			all = B_TRUE;
+			break;
+		case '?':
+		default:
+			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
+			    optopt);
+			usage(B_FALSE);
+		}
+	}
+
+	argc -= optind;
+	argv += optind;
+
+	if ((!all && !argc) && ((flags & ZFS_ITER_RECURSE) | cb.cb_version))
+		usage(B_FALSE);
+	if (showversions && (flags & ZFS_ITER_RECURSE || all ||
+	    cb.cb_version || argc))
+		usage(B_FALSE);
+	if ((all || argc) && (showversions))
+		usage(B_FALSE);
+	if (all && argc)
+		usage(B_FALSE);
+
+	if (showversions) {
+		/* Show info on available versions. */
+		(void) printf(gettext("The following filesystem versions are "
+		    "supported:\n\n"));
+		(void) printf(gettext("VER  DESCRIPTION\n"));
+		(void) printf("---  -----------------------------------------"
+		    "---------------\n");
+		(void) printf(gettext(" 1   Initial ZFS filesystem version\n"));
+		(void) printf(gettext(" 2   Enhanced directory entries\n"));
+		(void) printf(gettext(" 3   Case insensitive and filesystem "
+		    "user identifier (FUID)\n"));
+		(void) printf(gettext(" 4   userquota, groupquota "
+		    "properties\n"));
+		(void) printf(gettext(" 5   System attributes\n"));
+		(void) printf(gettext("\nFor more information on a particular "
+		    "version, including supported releases,\n"));
+		(void) printf("see the ZFS Administration Guide.\n\n");
+		ret = 0;
+	} else if (argc || all) {
+		/* Upgrade filesystems */
+		if (cb.cb_version == 0)
+			cb.cb_version = ZPL_VERSION;
+		ret = zfs_for_each(argc, argv, flags, ZFS_TYPE_FILESYSTEM,
+		    NULL, NULL, 0, upgrade_set_callback, &cb);
+		(void) printf(gettext("%llu filesystems upgraded\n"),
+		    cb.cb_numupgraded);
+		if (cb.cb_numsamegraded) {
+			(void) printf(gettext("%llu filesystems already at "
+			    "this version\n"),
+			    cb.cb_numsamegraded);
+		}
+		if (cb.cb_numfailed != 0)
+			ret = 1;
+	} else {
+		/* List old-version filesytems */
+		boolean_t found;
+		(void) printf(gettext("This system is currently running "
+		    "ZFS filesystem version %llu.\n\n"), ZPL_VERSION);
+
+		flags |= ZFS_ITER_RECURSE;
+		ret = zfs_for_each(0, NULL, flags, ZFS_TYPE_FILESYSTEM,
+		    NULL, NULL, 0, upgrade_list_callback, &cb);
+
+		found = cb.cb_foundone;
+		cb.cb_foundone = B_FALSE;
+		cb.cb_newer = B_TRUE;
+
+		ret = zfs_for_each(0, NULL, flags, ZFS_TYPE_FILESYSTEM,
+		    NULL, NULL, 0, upgrade_list_callback, &cb);
+
+		if (!cb.cb_foundone && !found) {
+			(void) printf(gettext("All filesystems are "
+			    "formatted with the current version.\n"));
+		}
+	}
+
+	return (ret);
+}
+
+#define	USTYPE_USR_BIT (0)
+#define	USTYPE_GRP_BIT (1)
+#define	USTYPE_PSX_BIT (2)
+#define	USTYPE_SMB_BIT (3)
+
+#define	USTYPE_USR (1 << USTYPE_USR_BIT)
+#define	USTYPE_GRP (1 << USTYPE_GRP_BIT)
+
+#define	USTYPE_PSX (1 << USTYPE_PSX_BIT)
+#define	USTYPE_SMB (1 << USTYPE_SMB_BIT)
+
+#define	USTYPE_PSX_USR (USTYPE_PSX | USTYPE_USR)
+#define	USTYPE_SMB_USR (USTYPE_SMB | USTYPE_USR)
+#define	USTYPE_PSX_GRP (USTYPE_PSX | USTYPE_GRP)
+#define	USTYPE_SMB_GRP (USTYPE_SMB | USTYPE_GRP)
+#define	USTYPE_ALL (USTYPE_PSX_USR | USTYPE_SMB_USR \
+		| USTYPE_PSX_GRP | USTYPE_SMB_GRP)
+
+
+#define	USPROP_USED_BIT (0)
+#define	USPROP_QUOTA_BIT (1)
+
+#define	USPROP_USED (1 << USPROP_USED_BIT)
+#define	USPROP_QUOTA (1 << USPROP_QUOTA_BIT)
+
+typedef struct us_node {
+	nvlist_t	*usn_nvl;
+	uu_avl_node_t	usn_avlnode;
+	uu_list_node_t	usn_listnode;
+} us_node_t;
+
+typedef struct us_cbdata {
+	nvlist_t		**cb_nvlp;
+	uu_avl_pool_t		*cb_avl_pool;
+	uu_avl_t		*cb_avl;
+	boolean_t		cb_numname;
+	boolean_t		cb_nicenum;
+	boolean_t		cb_sid2posix;
+	zfs_userquota_prop_t	cb_prop;
+	zfs_sort_column_t	*cb_sortcol;
+	size_t			cb_max_typelen;
+	size_t			cb_max_namelen;
+	size_t			cb_max_usedlen;
+	size_t			cb_max_quotalen;
+} us_cbdata_t;
+
+typedef struct {
+	zfs_sort_column_t *si_sortcol;
+	boolean_t si_num_name;
+	boolean_t si_parsable;
+} us_sort_info_t;
+
+static int
+us_compare(const void *larg, const void *rarg, void *unused)
+{
+	const us_node_t *l = larg;
+	const us_node_t *r = rarg;
+	int rc = 0;
+	us_sort_info_t *si = (us_sort_info_t *)unused;
+	zfs_sort_column_t *sortcol = si->si_sortcol;
+	boolean_t num_name = si->si_num_name;
+	nvlist_t *lnvl = l->usn_nvl;
+	nvlist_t *rnvl = r->usn_nvl;
+
+	for (; sortcol != NULL; sortcol = sortcol->sc_next) {
+		char *lvstr = "";
+		char *rvstr = "";
+		uint32_t lv32 = 0;
+		uint32_t rv32 = 0;
+		uint64_t lv64 = 0;
+		uint64_t rv64 = 0;
+		zfs_prop_t prop = sortcol->sc_prop;
+		const char *propname = NULL;
+		boolean_t reverse = sortcol->sc_reverse;
+
+		switch (prop) {
+		case ZFS_PROP_TYPE:
+			propname = "type";
+			(void) nvlist_lookup_uint32(lnvl, propname, &lv32);
+			(void) nvlist_lookup_uint32(rnvl, propname, &rv32);
+			if (rv32 != lv32)
+				rc = (rv32 > lv32) ? 1 : -1;
+			break;
+		case ZFS_PROP_NAME:
+			propname = "name";
+			if (num_name) {
+				(void) nvlist_lookup_uint32(lnvl, propname,
+				    &lv32);
+				(void) nvlist_lookup_uint32(rnvl, propname,
+				    &rv32);
+				if (rv32 != lv32)
+					rc = (rv32 > lv32) ? 1 : -1;
+			} else {
+				(void) nvlist_lookup_string(lnvl, propname,
+				    &lvstr);
+				(void) nvlist_lookup_string(rnvl, propname,
+				    &rvstr);
+				rc = strcmp(lvstr, rvstr);
+			}
+			break;
+
+		case ZFS_PROP_USED:
+		case ZFS_PROP_QUOTA:
+			if (ZFS_PROP_USED == prop)
+				propname = "used";
+			else
+				propname = "quota";
+			(void) nvlist_lookup_uint64(lnvl, propname, &lv64);
+			(void) nvlist_lookup_uint64(rnvl, propname, &rv64);
+			if (rv64 != lv64)
+				rc = (rv64 > lv64) ? 1 : -1;
+		}
+
+		if (rc)
+			if (rc < 0)
+				return (reverse ? 1 : -1);
+			else
+				return (reverse ? -1 : 1);
+	}
+
+	return (rc);
+}
+
+static inline const char *
+us_type2str(unsigned field_type)
+{
+	switch (field_type) {
+	case USTYPE_PSX_USR:
+		return ("POSIX User");
+	case USTYPE_PSX_GRP:
+		return ("POSIX Group");
+	case USTYPE_SMB_USR:
+		return ("SMB User");
+	case USTYPE_SMB_GRP:
+		return ("SMB Group");
+	default:
+		return ("Undefined");
+	}
+}
+
+/*
+ * zfs userspace
+ */
+static int
+userspace_cb(void *arg, const char *domain, uid_t rid, uint64_t space)
+{
+	us_cbdata_t *cb = (us_cbdata_t *)arg;
+	zfs_userquota_prop_t prop = cb->cb_prop;
+	char *name = NULL;
+	char *propname;
+	char namebuf[32];
+	char sizebuf[32];
+	us_node_t *node;
+	uu_avl_pool_t *avl_pool = cb->cb_avl_pool;
+	uu_avl_t *avl = cb->cb_avl;
+	uu_avl_index_t idx;
+	nvlist_t *props;
+	us_node_t *n;
+	zfs_sort_column_t *sortcol = cb->cb_sortcol;
+	unsigned type;
+	const char *typestr;
+	size_t namelen;
+	size_t typelen;
+	size_t sizelen;
+	us_sort_info_t sortinfo = { sortcol, cb->cb_numname };
+
+	if (domain == NULL || domain[0] == '\0') {
+		/* POSIX */
+		if (prop == ZFS_PROP_GROUPUSED || prop == ZFS_PROP_GROUPQUOTA) {
+			type = USTYPE_PSX_GRP;
+			struct group *g = getgrgid(rid);
+			if (g)
+				name = g->gr_name;
+		} else {
+			type = USTYPE_PSX_USR;
+			struct passwd *p = getpwuid(rid);
+			if (p)
+				name = p->pw_name;
+		}
+	} else {
+		char sid[ZFS_MAXNAMELEN+32];
+		uid_t id;
+		uint64_t classes;
+		int err = 0;
+		directory_error_t e;
+
+		(void) snprintf(sid, sizeof (sid), "%s-%u", domain, rid);
+		/* SMB */
+		if (prop == ZFS_PROP_GROUPUSED || prop == ZFS_PROP_GROUPQUOTA) {
+			type = USTYPE_SMB_GRP;
+			err = sid_to_id(sid, B_FALSE, &id);
+		} else {
+			type = USTYPE_SMB_USR;
+			err = sid_to_id(sid, B_TRUE, &id);
+		}
+
+		if (err == 0) {
+			rid = id;
+
+			e = directory_name_from_sid(NULL, sid, &name, &classes);
+			if (e != NULL) {
+				directory_error_free(e);
+				return (NULL);
+			}
+
+			if (name == NULL)
+				name = sid;
+		}
+	}
+
+/*
+ *	if (prop == ZFS_PROP_GROUPUSED || prop == ZFS_PROP_GROUPQUOTA)
+ *		ug = "group";
+ *	else
+ *		ug = "user";
+ */
+
+	if (prop == ZFS_PROP_USERUSED || prop == ZFS_PROP_GROUPUSED)
+		propname = "used";
+	else
+		propname = "quota";
+
+	(void) snprintf(namebuf, sizeof (namebuf), "%u", rid);
+	if (name == NULL)
+		name = namebuf;
+
+	if (cb->cb_nicenum)
+		zfs_nicenum(space, sizebuf, sizeof (sizebuf));
+	else
+		(void) sprintf(sizebuf, "%llu", space);
+
+	node = safe_malloc(sizeof (us_node_t));
+	uu_avl_node_init(node, &node->usn_avlnode, avl_pool);
+
+	if (nvlist_alloc(&props, NV_UNIQUE_NAME, 0) != 0) {
+		free(node);
+		return (-1);
+	}
+
+	if (nvlist_add_uint32(props, "type", type) != 0)
+		nomem();
+
+	if (cb->cb_numname) {
+		if (nvlist_add_uint32(props, "name", rid) != 0)
+			nomem();
+		namelen = strlen(namebuf);
+	} else {
+		if (nvlist_add_string(props, "name", name) != 0)
+			nomem();
+		namelen = strlen(name);
+	}
+
+	typestr = us_type2str(type);
+	typelen = strlen(gettext(typestr));
+	if (typelen > cb->cb_max_typelen)
+		cb->cb_max_typelen  = typelen;
+
+	if (namelen > cb->cb_max_namelen)
+		cb->cb_max_namelen  = namelen;
+
+	sizelen = strlen(sizebuf);
+	if (0 == strcmp(propname, "used")) {
+		if (sizelen > cb->cb_max_usedlen)
+			cb->cb_max_usedlen  = sizelen;
+	} else {
+		if (sizelen > cb->cb_max_quotalen)
+			cb->cb_max_quotalen  = sizelen;
+	}
+
+	node->usn_nvl = props;
+
+	n = uu_avl_find(avl, node, &sortinfo, &idx);
+	if (n == NULL)
+		uu_avl_insert(avl, node, idx);
+	else {
+		nvlist_free(props);
+		free(node);
+		node = n;
+		props = node->usn_nvl;
+	}
+
+	if (nvlist_add_uint64(props, propname, space) != 0)
+		nomem();
+
+	return (0);
+}
+
+static inline boolean_t
+usprop_check(zfs_userquota_prop_t p, unsigned types, unsigned props)
+{
+	unsigned type;
+	unsigned prop;
+
+	switch (p) {
+	case ZFS_PROP_USERUSED:
+		type = USTYPE_USR;
+		prop = USPROP_USED;
+		break;
+	case ZFS_PROP_USERQUOTA:
+		type = USTYPE_USR;
+		prop = USPROP_QUOTA;
+		break;
+	case ZFS_PROP_GROUPUSED:
+		type = USTYPE_GRP;
+		prop = USPROP_USED;
+		break;
+	case ZFS_PROP_GROUPQUOTA:
+		type = USTYPE_GRP;
+		prop = USPROP_QUOTA;
+		break;
+	default: /* ALL */
+		return (B_TRUE);
+	};
+
+	return (type & types && prop & props);
+}
+
+#define	USFIELD_TYPE (1 << 0)
+#define	USFIELD_NAME (1 << 1)
+#define	USFIELD_USED (1 << 2)
+#define	USFIELD_QUOTA (1 << 3)
+#define	USFIELD_ALL (USFIELD_TYPE | USFIELD_NAME | USFIELD_USED | USFIELD_QUOTA)
+
+static int
+parsefields(unsigned *fieldsp, char **names, unsigned *bits, size_t len)
+{
+	char *field = optarg;
+	char *delim;
+
+	do {
+		int i;
+		boolean_t found = B_FALSE;
+		delim = strchr(field, ',');
+		if (delim != NULL)
+			*delim = '\0';
+
+		for (i = 0; i < len; i++)
+			if (0 == strcmp(field, names[i])) {
+				found = B_TRUE;
+				*fieldsp |= bits[i];
+				break;
+			}
+
+		if (!found) {
+			(void) fprintf(stderr, gettext("invalid type '%s'"
+			    "for -t option\n"), field);
+			return (-1);
+		}
+
+		field = delim + 1;
+	} while (delim);
+
+	return (0);
+}
+
+
+static char *type_names[] = { "posixuser", "smbuser", "posixgroup", "smbgroup",
+	"all" };
+static unsigned type_bits[] = {
+	USTYPE_PSX_USR,
+	USTYPE_SMB_USR,
+	USTYPE_PSX_GRP,
+	USTYPE_SMB_GRP,
+	USTYPE_ALL
+};
+
+static char *us_field_names[] = { "type", "name", "used", "quota" };
+static unsigned us_field_bits[] = {
+	USFIELD_TYPE,
+	USFIELD_NAME,
+	USFIELD_USED,
+	USFIELD_QUOTA
+};
+
+static void
+print_us_node(boolean_t scripted, boolean_t parseable, unsigned fields,
+		size_t type_width, size_t name_width, size_t used_width,
+		size_t quota_width, us_node_t *node)
+{
+	nvlist_t *nvl = node->usn_nvl;
+	nvpair_t *nvp = NULL;
+	char valstr[ZFS_MAXNAMELEN];
+	boolean_t first = B_TRUE;
+	boolean_t quota_found = B_FALSE;
+
+	if (fields & USFIELD_QUOTA && !nvlist_exists(nvl, "quota"))
+		if (nvlist_add_string(nvl, "quota", "none") != 0)
+			nomem();
+
+	while ((nvp = nvlist_next_nvpair(nvl, nvp)) != NULL) {
+		char *pname = nvpair_name(nvp);
+		data_type_t type = nvpair_type(nvp);
+		uint32_t val32 = 0;
+		uint64_t val64 = 0;
+		char *strval = NULL;
+		unsigned field = 0;
+		unsigned width = 0;
+		int i;
+		for (i = 0; i < 4; i++) {
+			if (0 == strcmp(pname, us_field_names[i])) {
+				field = us_field_bits[i];
+				break;
+			}
+		}
+
+		if (!(field & fields))
+			continue;
+
+		switch (type) {
+		case DATA_TYPE_UINT32:
+			(void) nvpair_value_uint32(nvp, &val32);
+			break;
+		case DATA_TYPE_UINT64:
+			(void) nvpair_value_uint64(nvp, &val64);
+			break;
+		case DATA_TYPE_STRING:
+			(void) nvpair_value_string(nvp, &strval);
+			break;
+		default:
+			(void) fprintf(stderr, "Invalid data type\n");
+		}
+
+		if (!first)
+			if (scripted)
+				(void) printf("\t");
+			else
+				(void) printf("  ");
+
+		switch (field) {
+		case USFIELD_TYPE:
+			strval = (char *)us_type2str(val32);
+			width = type_width;
+			break;
+		case USFIELD_NAME:
+			if (type == DATA_TYPE_UINT64) {
+				(void) sprintf(valstr, "%llu", val64);
+				strval = valstr;
+			}
+			width = name_width;
+			break;
+		case USFIELD_USED:
+		case USFIELD_QUOTA:
+			if (type == DATA_TYPE_UINT64) {
+				(void) nvpair_value_uint64(nvp, &val64);
+				if (parseable)
+					(void) sprintf(valstr, "%llu", val64);
+				else
+					zfs_nicenum(val64, valstr,
+					    sizeof (valstr));
+				strval = valstr;
+			}
+
+			if (field == USFIELD_USED)
+				width = used_width;
+			else {
+				quota_found = B_FALSE;
+				width = quota_width;
+			}
+
+			break;
+		}
+
+		if (field == USFIELD_QUOTA && !quota_found)
+			(void) printf("%*s", width, strval);
+		else {
+			if (type == DATA_TYPE_STRING)
+				(void) printf("%-*s", width, strval);
+			else
+				(void) printf("%*s", width, strval);
+		}
+
+		first = B_FALSE;
+
+	}
+
+	(void) printf("\n");
+}
+
+static void
+print_us(boolean_t scripted, boolean_t parsable, unsigned fields,
+		unsigned type_width, unsigned name_width, unsigned used_width,
+		unsigned quota_width, boolean_t rmnode, uu_avl_t *avl)
+{
+	static char *us_field_hdr[] = { "TYPE", "NAME", "USED", "QUOTA" };
+	us_node_t *node;
+	const char *col;
+	int i;
+	size_t width[4] = { type_width, name_width, used_width, quota_width };
+
+	if (!scripted) {
+		boolean_t first = B_TRUE;
+		for (i = 0; i < 4; i++) {
+			unsigned field = us_field_bits[i];
+			if (!(field & fields))
+				continue;
+
+			col = gettext(us_field_hdr[i]);
+			if (field == USFIELD_TYPE || field == USFIELD_NAME)
+				(void) printf(first?"%-*s":"  %-*s", width[i],
+				    col);
+			else
+				(void) printf(first?"%*s":"  %*s", width[i],
+				    col);
+			first = B_FALSE;
+		}
+		(void) printf("\n");
+	}
+
+	for (node = uu_avl_first(avl); node != NULL;
+	    node = uu_avl_next(avl, node)) {
+		print_us_node(scripted, parsable, fields, type_width,
+		    name_width, used_width, used_width, node);
+		if (rmnode)
+			nvlist_free(node->usn_nvl);
+	}
+}
+
+static int
+zfs_do_userspace(int argc, char **argv)
+{
+	zfs_handle_t *zhp;
+	zfs_userquota_prop_t p;
+	uu_avl_pool_t *avl_pool;
+	uu_avl_t *avl_tree;
+	uu_avl_walk_t *walk;
+
+	char *cmd;
+	boolean_t scripted = B_FALSE;
+	boolean_t prtnum = B_FALSE;
+	boolean_t parseable = B_FALSE;
+	boolean_t sid2posix = B_FALSE;
+	int error = 0;
+	int c;
+	zfs_sort_column_t *default_sortcol = NULL;
+	zfs_sort_column_t *sortcol = NULL;
+	unsigned types = USTYPE_PSX_USR | USTYPE_SMB_USR;
+	unsigned fields = 0;
+	unsigned props = USPROP_USED | USPROP_QUOTA;
+	us_cbdata_t cb;
+	us_node_t *node;
+	boolean_t resort_avl = B_FALSE;
+
+	if (argc < 2)
+		usage(B_FALSE);
+
+	cmd = argv[0];
+	if (0 == strcmp(cmd, "groupspace"))
+		/* toggle default group types */
+		types = USTYPE_PSX_GRP | USTYPE_SMB_GRP;
+
+	/* check options */
+	while ((c = getopt(argc, argv, "nHpo:s:S:t:i")) != -1) {
+		switch (c) {
+		case 'n':
+			prtnum = B_TRUE;
+			break;
+		case 'H':
+			scripted = B_TRUE;
+			break;
+		case 'p':
+			parseable = B_TRUE;
+			break;
+		case 'o':
+			if (parsefields(&fields, us_field_names, us_field_bits,
+			    4) != 0)
+				return (1);
+			break;
+		case 's':
+			if (zfs_add_sort_column(&sortcol, optarg,
+			    B_FALSE) != 0) {
+				(void) fprintf(stderr,
+				    gettext("invalid property '%s'\n"), optarg);
+				usage(B_FALSE);
+			}
+			break;
+		case 'S':
+			if (zfs_add_sort_column(&sortcol, optarg,
+			    B_TRUE) != 0) {
+				(void) fprintf(stderr,
+				    gettext("invalid property '%s'\n"), optarg);
+				usage(B_FALSE);
+			}
+			break;
+		case 't':
+			if (parsefields(&types, type_names, type_bits, 5))
+				return (1);
+			break;
+		case 'i':
+			sid2posix = B_TRUE;
+			break;
+		case ':':
+			(void) fprintf(stderr, gettext("missing argument for "
+			    "'%c' option\n"), optopt);
+			usage(B_FALSE);
+			break;
+		case '?':
+			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
+			    optopt);
+			usage(B_FALSE);
+		}
+	}
+
+	argc -= optind;
+	argv += optind;
+
+	/* ok, now we have sorted by default colums (type,name) avl tree */
+	if (sortcol) {
+		zfs_sort_column_t *sc;
+		for (sc = sortcol; sc; sc = sc->sc_next) {
+			if (sc->sc_prop == ZFS_PROP_QUOTA) {
+				resort_avl = B_TRUE;
+				break;
+			}
+		}
+	}
+
+	if (!fields)
+		fields = USFIELD_ALL;
+
+	if ((zhp = zfs_open(g_zfs, argv[argc-1], ZFS_TYPE_DATASET)) == NULL)
+		return (1);
+
+	if ((avl_pool = uu_avl_pool_create("us_avl_pool", sizeof (us_node_t),
+	    offsetof(us_node_t, usn_avlnode),
+	    us_compare, UU_DEFAULT)) == NULL)
+		nomem();
+	if ((avl_tree = uu_avl_create(avl_pool, NULL, UU_DEFAULT)) == NULL)
+		nomem();
+
+	if (sortcol && !resort_avl)
+		cb.cb_sortcol = sortcol;
+	else {
+		(void) zfs_add_sort_column(&default_sortcol, "type", B_FALSE);
+		(void) zfs_add_sort_column(&default_sortcol, "name", B_FALSE);
+		cb.cb_sortcol = default_sortcol;
+	}
+	cb.cb_numname = prtnum;
+	cb.cb_nicenum = !parseable;
+	cb.cb_avl_pool = avl_pool;
+	cb.cb_avl = avl_tree;
+	cb.cb_sid2posix = sid2posix;
+	cb.cb_max_typelen = strlen(gettext("TYPE"));
+	cb.cb_max_namelen = strlen(gettext("NAME"));
+	cb.cb_max_usedlen = strlen(gettext("USED"));
+	cb.cb_max_quotalen = strlen(gettext("QUOTA"));
+
+	for (p = 0; p < ZFS_NUM_USERQUOTA_PROPS; p++) {
+		if (!usprop_check(p, types, props))
+			continue;
+
+		cb.cb_prop = p;
+		error = zfs_userspace(zhp, p, userspace_cb, &cb);
+		if (error)
+			break;
+	}
+
+
+	if (resort_avl) {
+		us_node_t *node;
+		us_node_t *rmnode;
+		uu_list_pool_t *listpool;
+		uu_list_t *list;
+		uu_avl_index_t idx = 0;
+		uu_list_index_t idx2 = 0;
+		listpool = uu_list_pool_create("tmplist", sizeof (us_node_t),
+		    offsetof(us_node_t, usn_listnode), NULL,
+		    UU_DEFAULT);
+		list = uu_list_create(listpool, NULL, UU_DEFAULT);
+
+		node = uu_avl_first(avl_tree);
+		uu_list_node_init(node, &node->usn_listnode, listpool);
+		while (node != NULL) {
+			rmnode = node;
+			node = uu_avl_next(avl_tree, node);
+			uu_avl_remove(avl_tree, rmnode);
+			if (uu_list_find(list, rmnode, NULL, &idx2) == NULL) {
+				uu_list_insert(list, rmnode, idx2);
+			}
+		}
+
+		for (node = uu_list_first(list); node != NULL;
+		    node = uu_list_next(list, node)) {
+			us_sort_info_t sortinfo = { sortcol, cb.cb_numname };
+			if (uu_avl_find(avl_tree, node, &sortinfo, &idx) ==
+			    NULL)
+			uu_avl_insert(avl_tree, node, idx);
+		}
+
+		uu_list_destroy(list);
+	}
+
+	/* print & free node`s nvlist memory */
+	print_us(scripted, parseable, fields, cb.cb_max_typelen,
+	    cb.cb_max_namelen, cb.cb_max_usedlen,
+	    cb.cb_max_quotalen, B_TRUE, cb.cb_avl);
+
+	if (sortcol)
+		zfs_free_sort_columns(sortcol);
+	zfs_free_sort_columns(default_sortcol);
+
+	/*
+	 * Finally, clean up the AVL tree.
+	 */
+	if ((walk = uu_avl_walk_start(cb.cb_avl, UU_WALK_ROBUST)) == NULL)
+		nomem();
+
+	while ((node = uu_avl_walk_next(walk)) != NULL) {
+		uu_avl_remove(cb.cb_avl, node);
+		free(node);
+	}
+
+	uu_avl_walk_end(walk);
+	uu_avl_destroy(avl_tree);
+	uu_avl_pool_destroy(avl_pool);
+
+	return (error);
+}
+
+/*
+ * list [-r][-d max] [-H] [-o property[,property]...] [-t type[,type]...]
+ *      [-s property [-s property]...] [-S property [-S property]...]
+ *      <dataset> ...
+ *
+ *	-r	Recurse over all children
+ *	-d	Limit recursion by depth.
+ *	-H	Scripted mode; elide headers and separate columns by tabs
+ *	-o	Control which fields to display.
+ *	-t	Control which object types to display.
+ *	-s	Specify sort columns, descending order.
+ *	-S	Specify sort columns, ascending order.
+ *
+ * When given no arguments, lists all filesystems in the system.
+ * Otherwise, list the specified datasets, optionally recursing down them if
+ * '-r' is specified.
+ */
+typedef struct list_cbdata {
+	boolean_t	cb_first;
+	boolean_t	cb_scripted;
+	zprop_list_t	*cb_proplist;
+} list_cbdata_t;
+
+/*
+ * Given a list of columns to display, output appropriate headers for each one.
+ */
+static void
+print_header(zprop_list_t *pl)
+{
+	char headerbuf[ZFS_MAXPROPLEN];
+	const char *header;
+	int i;
+	boolean_t first = B_TRUE;
+	boolean_t right_justify;
+
+	for (; pl != NULL; pl = pl->pl_next) {
+		if (!first) {
+			(void) printf("  ");
+		} else {
+			first = B_FALSE;
+		}
+
+		right_justify = B_FALSE;
+		if (pl->pl_prop != ZPROP_INVAL) {
+			header = zfs_prop_column_name(pl->pl_prop);
+			right_justify = zfs_prop_align_right(pl->pl_prop);
+		} else {
+			for (i = 0; pl->pl_user_prop[i] != '\0'; i++)
+				headerbuf[i] = toupper(pl->pl_user_prop[i]);
+			headerbuf[i] = '\0';
+			header = headerbuf;
+		}
+
+		if (pl->pl_next == NULL && !right_justify)
+			(void) printf("%s", header);
+		else if (right_justify)
+			(void) printf("%*s", pl->pl_width, header);
+		else
+			(void) printf("%-*s", pl->pl_width, header);
+	}
+
+	(void) printf("\n");
+}
+
+/*
+ * Given a dataset and a list of fields, print out all the properties according
+ * to the described layout.
+ */
+static void
+print_dataset(zfs_handle_t *zhp, zprop_list_t *pl, boolean_t scripted)
+{
+	boolean_t first = B_TRUE;
+	char property[ZFS_MAXPROPLEN];
+	nvlist_t *userprops = zfs_get_user_props(zhp);
+	nvlist_t *propval;
+	char *propstr;
+	boolean_t right_justify;
+	int width;
+
+	for (; pl != NULL; pl = pl->pl_next) {
+		if (!first) {
+			if (scripted)
+				(void) printf("\t");
+			else
+				(void) printf("  ");
+		} else {
+			first = B_FALSE;
+		}
+
+		if (pl->pl_prop != ZPROP_INVAL) {
+			if (zfs_prop_get(zhp, pl->pl_prop, property,
+			    sizeof (property), NULL, NULL, 0, B_FALSE) != 0)
+				propstr = "-";
+			else
+				propstr = property;
+
+			right_justify = zfs_prop_align_right(pl->pl_prop);
+		} else if (zfs_prop_userquota(pl->pl_user_prop)) {
+			if (zfs_prop_get_userquota(zhp, pl->pl_user_prop,
+			    property, sizeof (property), B_FALSE) != 0)
+				propstr = "-";
+			else
+				propstr = property;
+			right_justify = B_TRUE;
+		} else if (zfs_prop_written(pl->pl_user_prop)) {
+			if (zfs_prop_get_written(zhp, pl->pl_user_prop,
+			    property, sizeof (property), B_FALSE) != 0)
+				propstr = "-";
+			else
+				propstr = property;
+			right_justify = B_TRUE;
+		} else {
+			if (nvlist_lookup_nvlist(userprops,
+			    pl->pl_user_prop, &propval) != 0)
+				propstr = "-";
+			else
+				verify(nvlist_lookup_string(propval,
+				    ZPROP_VALUE, &propstr) == 0);
+			right_justify = B_FALSE;
+		}
+
+		width = pl->pl_width;
+
+		/*
+		 * If this is being called in scripted mode, or if this is the
+		 * last column and it is left-justified, don't include a width
+		 * format specifier.
+		 */
+		if (scripted || (pl->pl_next == NULL && !right_justify))
+			(void) printf("%s", propstr);
+		else if (right_justify)
+			(void) printf("%*s", width, propstr);
+		else
+			(void) printf("%-*s", width, propstr);
+	}
+
+	(void) printf("\n");
+}
+
+/*
+ * Generic callback function to list a dataset or snapshot.
+ */
+static int
+list_callback(zfs_handle_t *zhp, void *data)
+{
+	list_cbdata_t *cbp = data;
+
+	if (cbp->cb_first) {
+		if (!cbp->cb_scripted)
+			print_header(cbp->cb_proplist);
+		cbp->cb_first = B_FALSE;
+	}
+
+	print_dataset(zhp, cbp->cb_proplist, cbp->cb_scripted);
+
+	return (0);
+}
+
+static int
+zfs_do_list(int argc, char **argv)
+{
+	int c;
+	boolean_t scripted = B_FALSE;
+	static char default_fields[] =
+	    "name,used,available,referenced,mountpoint";
+	int types = ZFS_TYPE_DATASET;
+	boolean_t types_specified = B_FALSE;
+	char *fields = NULL;
+	list_cbdata_t cb = { 0 };
+	char *value;
+	int limit = 0;
+	int ret = 0;
+	zfs_sort_column_t *sortcol = NULL;
+	int flags = ZFS_ITER_PROP_LISTSNAPS | ZFS_ITER_ARGS_CAN_BE_PATHS;
+
+	/* check options */
+	while ((c = getopt(argc, argv, ":d:o:rt:Hs:S:")) != -1) {
+		switch (c) {
+		case 'o':
+			fields = optarg;
+			break;
+		case 'd':
+			limit = parse_depth(optarg, &flags);
+			break;
+		case 'r':
+			flags |= ZFS_ITER_RECURSE;
+			break;
+		case 'H':
+			scripted = B_TRUE;
+			break;
+		case 's':
+			if (zfs_add_sort_column(&sortcol, optarg,
+			    B_FALSE) != 0) {
+				(void) fprintf(stderr,
+				    gettext("invalid property '%s'\n"), optarg);
+				usage(B_FALSE);
+			}
+			break;
+		case 'S':
+			if (zfs_add_sort_column(&sortcol, optarg,
+			    B_TRUE) != 0) {
+				(void) fprintf(stderr,
+				    gettext("invalid property '%s'\n"), optarg);
+				usage(B_FALSE);
+			}
+			break;
+		case 't':
+			types = 0;
+			types_specified = B_TRUE;
+			flags &= ~ZFS_ITER_PROP_LISTSNAPS;
+			while (*optarg != '\0') {
+				static char *type_subopts[] = { "filesystem",
+				    "volume", "snapshot", "all", NULL };
+
+				switch (getsubopt(&optarg, type_subopts,
+				    &value)) {
+				case 0:
+					types |= ZFS_TYPE_FILESYSTEM;
+					break;
+				case 1:
+					types |= ZFS_TYPE_VOLUME;
+					break;
+				case 2:
+					types |= ZFS_TYPE_SNAPSHOT;
+					break;
+				case 3:
+					types = ZFS_TYPE_DATASET;
+					break;
+
+				default:
+					(void) fprintf(stderr,
+					    gettext("invalid type '%s'\n"),
+					    value);
+					usage(B_FALSE);
+				}
+			}
+			break;
+		case ':':
+			(void) fprintf(stderr, gettext("missing argument for "
+			    "'%c' option\n"), optopt);
+			usage(B_FALSE);
+			break;
+		case '?':
+			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
+			    optopt);
+			usage(B_FALSE);
+		}
+	}
+
+	argc -= optind;
+	argv += optind;
+
+	if (fields == NULL)
+		fields = default_fields;
+
+	/*
+	 * If "-o space" and no types were specified, don't display snapshots.
+	 */
+	if (strcmp(fields, "space") == 0 && types_specified == B_FALSE)
+		types &= ~ZFS_TYPE_SNAPSHOT;
+
+	/*
+	 * If the user specifies '-o all', the zprop_get_list() doesn't
+	 * normally include the name of the dataset.  For 'zfs list', we always
+	 * want this property to be first.
+	 */
+	if (zprop_get_list(g_zfs, fields, &cb.cb_proplist, ZFS_TYPE_DATASET)
+	    != 0)
+		usage(B_FALSE);
+
+	cb.cb_scripted = scripted;
+	cb.cb_first = B_TRUE;
+
+	ret = zfs_for_each(argc, argv, flags, types, sortcol, &cb.cb_proplist,
+	    limit, list_callback, &cb);
+
+	zprop_free_list(cb.cb_proplist);
+	zfs_free_sort_columns(sortcol);
+
+	if (ret == 0 && cb.cb_first && !cb.cb_scripted)
+		(void) printf(gettext("no datasets available\n"));
+
+	return (ret);
+}
+
+/*
+ * zfs rename [-f] <fs | snap | vol> <fs | snap | vol>
+ * zfs rename [-f] -p <fs | vol> <fs | vol>
+ * zfs rename -r <snap> <snap>
+ *
+ * Renames the given dataset to another of the same type.
+ *
+ * The '-p' flag creates all the non-existing ancestors of the target first.
+ */
+/* ARGSUSED */
+static int
+zfs_do_rename(int argc, char **argv)
+{
+	zfs_handle_t *zhp;
+	int c;
+	int ret = 0;
+	boolean_t recurse = B_FALSE;
+	boolean_t parents = B_FALSE;
+	boolean_t force_unmount = B_FALSE;
+
+	/* check options */
+	while ((c = getopt(argc, argv, "prf")) != -1) {
+		switch (c) {
+		case 'p':
+			parents = B_TRUE;
+			break;
+		case 'r':
+			recurse = B_TRUE;
+			break;
+		case 'f':
+			force_unmount = B_TRUE;
+			break;
+		case '?':
+		default:
+			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
+			    optopt);
+			usage(B_FALSE);
+		}
+	}
+
+	argc -= optind;
+	argv += optind;
+
+	/* check number of arguments */
+	if (argc < 1) {
+		(void) fprintf(stderr, gettext("missing source dataset "
+		    "argument\n"));
+		usage(B_FALSE);
+	}
+	if (argc < 2) {
+		(void) fprintf(stderr, gettext("missing target dataset "
+		    "argument\n"));
+		usage(B_FALSE);
+	}
+	if (argc > 2) {
+		(void) fprintf(stderr, gettext("too many arguments\n"));
+		usage(B_FALSE);
+	}
+
+	if (recurse && parents) {
+		(void) fprintf(stderr, gettext("-p and -r options are mutually "
+		    "exclusive\n"));
+		usage(B_FALSE);
+	}
+
+	if (recurse && strchr(argv[0], '@') == 0) {
+		(void) fprintf(stderr, gettext("source dataset for recursive "
+		    "rename must be a snapshot\n"));
+		usage(B_FALSE);
+	}
+
+	if ((zhp = zfs_open(g_zfs, argv[0], parents ? ZFS_TYPE_FILESYSTEM |
+	    ZFS_TYPE_VOLUME : ZFS_TYPE_DATASET)) == NULL)
+		return (1);
+
+	/* If we were asked and the name looks good, try to create ancestors. */
+	if (parents && zfs_name_valid(argv[1], zfs_get_type(zhp)) &&
+	    zfs_create_ancestors(g_zfs, argv[1]) != 0) {
+		zfs_close(zhp);
+		return (1);
+	}
+
+	ret = (zfs_rename(zhp, argv[1], recurse, force_unmount) != 0);
+
+	zfs_close(zhp);
+	return (ret);
+}
+
+/*
+ * zfs promote <fs>
+ *
+ * Promotes the given clone fs to be the parent
+ */
+/* ARGSUSED */
+static int
+zfs_do_promote(int argc, char **argv)
+{
+	zfs_handle_t *zhp;
+	int ret = 0;
+
+	/* check options */
+	if (argc > 1 && argv[1][0] == '-') {
+		(void) fprintf(stderr, gettext("invalid option '%c'\n"),
+		    argv[1][1]);
+		usage(B_FALSE);
+	}
+
+	/* check number of arguments */
+	if (argc < 2) {
+		(void) fprintf(stderr, gettext("missing clone filesystem"
+		    " argument\n"));
+		usage(B_FALSE);
+	}
+	if (argc > 2) {
+		(void) fprintf(stderr, gettext("too many arguments\n"));
+		usage(B_FALSE);
+	}
+
+	zhp = zfs_open(g_zfs, argv[1], ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME);
+	if (zhp == NULL)
+		return (1);
+
+	ret = (zfs_promote(zhp) != 0);
+
+
+	zfs_close(zhp);
+	return (ret);
+}
+
+/*
+ * zfs rollback [-rRf] <snapshot>
+ *
+ *	-r	Delete any intervening snapshots before doing rollback
+ *	-R	Delete any snapshots and their clones
+ *	-f	ignored for backwards compatability
+ *
+ * Given a filesystem, rollback to a specific snapshot, discarding any changes
+ * since then and making it the active dataset.  If more recent snapshots exist,
+ * the command will complain unless the '-r' flag is given.
+ */
+typedef struct rollback_cbdata {
+	uint64_t	cb_create;
+	boolean_t	cb_first;
+	int		cb_doclones;
+	char		*cb_target;
+	int		cb_error;
+	boolean_t	cb_recurse;
+	boolean_t	cb_dependent;
+} rollback_cbdata_t;
+
+/*
+ * Report any snapshots more recent than the one specified.  Used when '-r' is
+ * not specified.  We reuse this same callback for the snapshot dependents - if
+ * 'cb_dependent' is set, then this is a dependent and we should report it
+ * without checking the transaction group.
+ */
+static int
+rollback_check(zfs_handle_t *zhp, void *data)
+{
+	rollback_cbdata_t *cbp = data;
+
+	if (cbp->cb_doclones) {
+		zfs_close(zhp);
+		return (0);
+	}
+
+	if (!cbp->cb_dependent) {
+		if (strcmp(zfs_get_name(zhp), cbp->cb_target) != 0 &&
+		    zfs_get_type(zhp) == ZFS_TYPE_SNAPSHOT &&
+		    zfs_prop_get_int(zhp, ZFS_PROP_CREATETXG) >
+		    cbp->cb_create) {
+
+			if (cbp->cb_first && !cbp->cb_recurse) {
+				(void) fprintf(stderr, gettext("cannot "
+				    "rollback to '%s': more recent snapshots "
+				    "exist\n"),
+				    cbp->cb_target);
+				(void) fprintf(stderr, gettext("use '-r' to "
+				    "force deletion of the following "
+				    "snapshots:\n"));
+				cbp->cb_first = 0;
+				cbp->cb_error = 1;
+			}
+
+			if (cbp->cb_recurse) {
+				cbp->cb_dependent = B_TRUE;
+				if (zfs_iter_dependents(zhp, B_TRUE,
+				    rollback_check, cbp) != 0) {
+					zfs_close(zhp);
+					return (-1);
+				}
+				cbp->cb_dependent = B_FALSE;
+			} else {
+				(void) fprintf(stderr, "%s\n",
+				    zfs_get_name(zhp));
+			}
+		}
+	} else {
+		if (cbp->cb_first && cbp->cb_recurse) {
+			(void) fprintf(stderr, gettext("cannot rollback to "
+			    "'%s': clones of previous snapshots exist\n"),
+			    cbp->cb_target);
+			(void) fprintf(stderr, gettext("use '-R' to "
+			    "force deletion of the following clones and "
+			    "dependents:\n"));
+			cbp->cb_first = 0;
+			cbp->cb_error = 1;
+		}
+
+		(void) fprintf(stderr, "%s\n", zfs_get_name(zhp));
+	}
+
+	zfs_close(zhp);
+	return (0);
+}
+
+static int
+zfs_do_rollback(int argc, char **argv)
+{
+	int ret = 0;
+	int c;
+	boolean_t force = B_FALSE;
+	rollback_cbdata_t cb = { 0 };
+	zfs_handle_t *zhp, *snap;
+	char parentname[ZFS_MAXNAMELEN];
+	char *delim;
+
+	/* check options */
+	while ((c = getopt(argc, argv, "rRf")) != -1) {
+		switch (c) {
+		case 'r':
+			cb.cb_recurse = 1;
+			break;
+		case 'R':
+			cb.cb_recurse = 1;
+			cb.cb_doclones = 1;
+			break;
+		case 'f':
+			force = B_TRUE;
+			break;
+		case '?':
+			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
+			    optopt);
+			usage(B_FALSE);
+		}
+	}
+
+	argc -= optind;
+	argv += optind;
+
+	/* check number of arguments */
+	if (argc < 1) {
+		(void) fprintf(stderr, gettext("missing dataset argument\n"));
+		usage(B_FALSE);
+	}
+	if (argc > 1) {
+		(void) fprintf(stderr, gettext("too many arguments\n"));
+		usage(B_FALSE);
+	}
+
+	/* open the snapshot */
+	if ((snap = zfs_open(g_zfs, argv[0], ZFS_TYPE_SNAPSHOT)) == NULL)
+		return (1);
+
+	/* open the parent dataset */
+	(void) strlcpy(parentname, argv[0], sizeof (parentname));
+	verify((delim = strrchr(parentname, '@')) != NULL);
+	*delim = '\0';
+	if ((zhp = zfs_open(g_zfs, parentname, ZFS_TYPE_DATASET)) == NULL) {
+		zfs_close(snap);
+		return (1);
+	}
+
+	/*
+	 * Check for more recent snapshots and/or clones based on the presence
+	 * of '-r' and '-R'.
+	 */
+	cb.cb_target = argv[0];
+	cb.cb_create = zfs_prop_get_int(snap, ZFS_PROP_CREATETXG);
+	cb.cb_first = B_TRUE;
+	cb.cb_error = 0;
+	if ((ret = zfs_iter_children(zhp, rollback_check, &cb)) != 0)
+		goto out;
+
+	if ((ret = cb.cb_error) != 0)
+		goto out;
+
+	/*
+	 * Rollback parent to the given snapshot.
+	 */
+	ret = zfs_rollback(zhp, snap, force);
+
+out:
+	zfs_close(snap);
+	zfs_close(zhp);
+
+	if (ret == 0)
+		return (0);
+	else
+		return (1);
+}
+
+/*
+ * zfs set property=value { fs | snap | vol } ...
+ *
+ * Sets the given property for all datasets specified on the command line.
+ */
+typedef struct set_cbdata {
+	char		*cb_propname;
+	char		*cb_value;
+} set_cbdata_t;
+
+static int
+set_callback(zfs_handle_t *zhp, void *data)
+{
+	set_cbdata_t *cbp = data;
+
+	if (zfs_prop_set(zhp, cbp->cb_propname, cbp->cb_value) != 0) {
+		switch (libzfs_errno(g_zfs)) {
+		case EZFS_MOUNTFAILED:
+			(void) fprintf(stderr, gettext("property may be set "
+			    "but unable to remount filesystem\n"));
+			break;
+		case EZFS_SHARENFSFAILED:
+			(void) fprintf(stderr, gettext("property may be set "
+			    "but unable to reshare filesystem\n"));
+			break;
+		}
+		return (1);
+	}
+	return (0);
+}
+
+static int
+zfs_do_set(int argc, char **argv)
+{
+	set_cbdata_t cb;
+	int ret = 0;
+
+	/* check for options */
+	if (argc > 1 && argv[1][0] == '-') {
+		(void) fprintf(stderr, gettext("invalid option '%c'\n"),
+		    argv[1][1]);
+		usage(B_FALSE);
+	}
+
+	/* check number of arguments */
+	if (argc < 2) {
+		(void) fprintf(stderr, gettext("missing property=value "
+		    "argument\n"));
+		usage(B_FALSE);
+	}
+	if (argc < 3) {
+		(void) fprintf(stderr, gettext("missing dataset name\n"));
+		usage(B_FALSE);
+	}
+
+	/* validate property=value argument */
+	cb.cb_propname = argv[1];
+	if (((cb.cb_value = strchr(cb.cb_propname, '=')) == NULL) ||
+	    (cb.cb_value[1] == '\0')) {
+		(void) fprintf(stderr, gettext("missing value in "
+		    "property=value argument\n"));
+		usage(B_FALSE);
+	}
+
+	*cb.cb_value = '\0';
+	cb.cb_value++;
+
+	if (*cb.cb_propname == '\0') {
+		(void) fprintf(stderr,
+		    gettext("missing property in property=value argument\n"));
+		usage(B_FALSE);
+	}
+
+	ret = zfs_for_each(argc - 2, argv + 2, NULL,
+	    ZFS_TYPE_DATASET, NULL, NULL, 0, set_callback, &cb);
+
+	return (ret);
+}
+
+/*
+ * zfs snapshot [-r] [-o prop=value] ... <fs@snap>
+ *
+ * Creates a snapshot with the given name.  While functionally equivalent to
+ * 'zfs create', it is a separate command to differentiate intent.
+ */
+static int
+zfs_do_snapshot(int argc, char **argv)
+{
+	boolean_t recursive = B_FALSE;
+	int ret = 0;
+	char c;
+	nvlist_t *props;
+
+	if (nvlist_alloc(&props, NV_UNIQUE_NAME, 0) != 0)
+		nomem();
+
+	/* check options */
+	while ((c = getopt(argc, argv, "ro:")) != -1) {
+		switch (c) {
+		case 'o':
+			if (parseprop(props))
+				return (1);
+			break;
+		case 'r':
+			recursive = B_TRUE;
+			break;
+		case '?':
+			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
+			    optopt);
+			goto usage;
+		}
+	}
+
+	argc -= optind;
+	argv += optind;
+
+	/* check number of arguments */
+	if (argc < 1) {
+		(void) fprintf(stderr, gettext("missing snapshot argument\n"));
+		goto usage;
+	}
+	if (argc > 1) {
+		(void) fprintf(stderr, gettext("too many arguments\n"));
+		goto usage;
+	}
+
+	ret = zfs_snapshot(g_zfs, argv[0], recursive, props);
+	nvlist_free(props);
+	if (ret && recursive)
+		(void) fprintf(stderr, gettext("no snapshots were created\n"));
+	return (ret != 0);
+
+usage:
+	nvlist_free(props);
+	usage(B_FALSE);
+	return (-1);
+}
+
+/*
+ * Send a backup stream to stdout.
+ */
+static int
+zfs_do_send(int argc, char **argv)
+{
+	char *fromname = NULL;
+	char *toname = NULL;
+	char *cp;
+	zfs_handle_t *zhp;
+	sendflags_t flags = { 0 };
+	int c, err;
+	nvlist_t *dbgnv = NULL;
+	boolean_t extraverbose = B_FALSE;
+
+	/* check options */
+	while ((c = getopt(argc, argv, ":i:I:RDpvnP")) != -1) {
+		switch (c) {
+		case 'i':
+			if (fromname)
+				usage(B_FALSE);
+			fromname = optarg;
+			break;
+		case 'I':
+			if (fromname)
+				usage(B_FALSE);
+			fromname = optarg;
+			flags.doall = B_TRUE;
+			break;
+		case 'R':
+			flags.replicate = B_TRUE;
+			break;
+		case 'p':
+			flags.props = B_TRUE;
+			break;
+		case 'P':
+			flags.parsable = B_TRUE;
+			flags.verbose = B_TRUE;
+			break;
+		case 'v':
+			if (flags.verbose)
+				extraverbose = B_TRUE;
+			flags.verbose = B_TRUE;
+			flags.progress = B_TRUE;
+			break;
+		case 'D':
+			flags.dedup = B_TRUE;
+			break;
+		case 'n':
+			flags.dryrun = B_TRUE;
+			break;
+		case ':':
+			(void) fprintf(stderr, gettext("missing argument for "
+			    "'%c' option\n"), optopt);
+			usage(B_FALSE);
+			break;
+		case '?':
+			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
+			    optopt);
+			usage(B_FALSE);
+		}
+	}
+
+	argc -= optind;
+	argv += optind;
+
+	/* check number of arguments */
+	if (argc < 1) {
+		(void) fprintf(stderr, gettext("missing snapshot argument\n"));
+		usage(B_FALSE);
+	}
+	if (argc > 1) {
+		(void) fprintf(stderr, gettext("too many arguments\n"));
+		usage(B_FALSE);
+	}
+
+	if (!flags.dryrun && isatty(STDOUT_FILENO)) {
+		(void) fprintf(stderr,
+		    gettext("Error: Stream can not be written to a terminal.\n"
+		    "You must redirect standard output.\n"));
+		return (1);
+	}
+
+	cp = strchr(argv[0], '@');
+	if (cp == NULL) {
+		(void) fprintf(stderr,
+		    gettext("argument must be a snapshot\n"));
+		usage(B_FALSE);
+	}
+	*cp = '\0';
+	toname = cp + 1;
+	zhp = zfs_open(g_zfs, argv[0], ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME);
+	if (zhp == NULL)
+		return (1);
+
+	/*
+	 * If they specified the full path to the snapshot, chop off
+	 * everything except the short name of the snapshot, but special
+	 * case if they specify the origin.
+	 */
+	if (fromname && (cp = strchr(fromname, '@')) != NULL) {
+		char origin[ZFS_MAXNAMELEN];
+		zprop_source_t src;
+
+		(void) zfs_prop_get(zhp, ZFS_PROP_ORIGIN,
+		    origin, sizeof (origin), &src, NULL, 0, B_FALSE);
+
+		if (strcmp(origin, fromname) == 0) {
+			fromname = NULL;
+			flags.fromorigin = B_TRUE;
+		} else {
+			*cp = '\0';
+			if (cp != fromname && strcmp(argv[0], fromname)) {
+				(void) fprintf(stderr,
+				    gettext("incremental source must be "
+				    "in same filesystem\n"));
+				usage(B_FALSE);
+			}
+			fromname = cp + 1;
+			if (strchr(fromname, '@') || strchr(fromname, '/')) {
+				(void) fprintf(stderr,
+				    gettext("invalid incremental source\n"));
+				usage(B_FALSE);
+			}
+		}
+	}
+
+	if (flags.replicate && fromname == NULL)
+		flags.doall = B_TRUE;
+
+	err = zfs_send(zhp, fromname, toname, &flags, STDOUT_FILENO, NULL, 0,
+	    extraverbose ? &dbgnv : NULL);
+
+	if (extraverbose && dbgnv != NULL) {
+		/*
+		 * dump_nvlist prints to stdout, but that's been
+		 * redirected to a file.  Make it print to stderr
+		 * instead.
+		 */
+		(void) dup2(STDERR_FILENO, STDOUT_FILENO);
+		dump_nvlist(dbgnv, 0);
+		nvlist_free(dbgnv);
+	}
+	zfs_close(zhp);
+
+	return (err != 0);
+}
+
+/*
+ * zfs receive [-vnFu] [-d | -e] <fs@snap>
+ *
+ * Restore a backup stream from stdin.
+ */
+static int
+zfs_do_receive(int argc, char **argv)
+{
+	int c, err;
+	recvflags_t flags = { 0 };
+
+	/* check options */
+	while ((c = getopt(argc, argv, ":denuvF")) != -1) {
+		switch (c) {
+		case 'd':
+			flags.isprefix = B_TRUE;
+			break;
+		case 'e':
+			flags.isprefix = B_TRUE;
+			flags.istail = B_TRUE;
+			break;
+		case 'n':
+			flags.dryrun = B_TRUE;
+			break;
+		case 'u':
+			flags.nomount = B_TRUE;
+			break;
+		case 'v':
+			flags.verbose = B_TRUE;
+			break;
+		case 'F':
+			flags.force = B_TRUE;
+			break;
+		case ':':
+			(void) fprintf(stderr, gettext("missing argument for "
+			    "'%c' option\n"), optopt);
+			usage(B_FALSE);
+			break;
+		case '?':
+			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
+			    optopt);
+			usage(B_FALSE);
+		}
+	}
+
+	argc -= optind;
+	argv += optind;
+
+	/* check number of arguments */
+	if (argc < 1) {
+		(void) fprintf(stderr, gettext("missing snapshot argument\n"));
+		usage(B_FALSE);
+	}
+	if (argc > 1) {
+		(void) fprintf(stderr, gettext("too many arguments\n"));
+		usage(B_FALSE);
+	}
+
+	if (isatty(STDIN_FILENO)) {
+		(void) fprintf(stderr,
+		    gettext("Error: Backup stream can not be read "
+		    "from a terminal.\n"
+		    "You must redirect standard input.\n"));
+		return (1);
+	}
+
+	err = zfs_receive(g_zfs, argv[0], &flags, STDIN_FILENO, NULL);
+
+	return (err != 0);
+}
+
+/*
+ * allow/unallow stuff
+ */
+/* copied from zfs/sys/dsl_deleg.h */
+#define	ZFS_DELEG_PERM_CREATE		"create"
+#define	ZFS_DELEG_PERM_DESTROY		"destroy"
+#define	ZFS_DELEG_PERM_SNAPSHOT		"snapshot"
+#define	ZFS_DELEG_PERM_ROLLBACK		"rollback"
+#define	ZFS_DELEG_PERM_CLONE		"clone"
+#define	ZFS_DELEG_PERM_PROMOTE		"promote"
+#define	ZFS_DELEG_PERM_RENAME		"rename"
+#define	ZFS_DELEG_PERM_MOUNT		"mount"
+#define	ZFS_DELEG_PERM_SHARE		"share"
+#define	ZFS_DELEG_PERM_SEND		"send"
+#define	ZFS_DELEG_PERM_RECEIVE		"receive"
+#define	ZFS_DELEG_PERM_ALLOW		"allow"
+#define	ZFS_DELEG_PERM_USERPROP		"userprop"
+#define	ZFS_DELEG_PERM_VSCAN		"vscan" /* ??? */
+#define	ZFS_DELEG_PERM_USERQUOTA	"userquota"
+#define	ZFS_DELEG_PERM_GROUPQUOTA	"groupquota"
+#define	ZFS_DELEG_PERM_USERUSED		"userused"
+#define	ZFS_DELEG_PERM_GROUPUSED	"groupused"
+#define	ZFS_DELEG_PERM_HOLD		"hold"
+#define	ZFS_DELEG_PERM_RELEASE		"release"
+#define	ZFS_DELEG_PERM_DIFF		"diff"
+
+#define	ZFS_NUM_DELEG_NOTES ZFS_DELEG_NOTE_NONE
+
+static zfs_deleg_perm_tab_t zfs_deleg_perm_tbl[] = {
+	{ ZFS_DELEG_PERM_ALLOW, ZFS_DELEG_NOTE_ALLOW },
+	{ ZFS_DELEG_PERM_CLONE, ZFS_DELEG_NOTE_CLONE },
+	{ ZFS_DELEG_PERM_CREATE, ZFS_DELEG_NOTE_CREATE },
+	{ ZFS_DELEG_PERM_DESTROY, ZFS_DELEG_NOTE_DESTROY },
+	{ ZFS_DELEG_PERM_DIFF, ZFS_DELEG_NOTE_DIFF},
+	{ ZFS_DELEG_PERM_HOLD, ZFS_DELEG_NOTE_HOLD },
+	{ ZFS_DELEG_PERM_MOUNT, ZFS_DELEG_NOTE_MOUNT },
+	{ ZFS_DELEG_PERM_PROMOTE, ZFS_DELEG_NOTE_PROMOTE },
+	{ ZFS_DELEG_PERM_RECEIVE, ZFS_DELEG_NOTE_RECEIVE },
+	{ ZFS_DELEG_PERM_RELEASE, ZFS_DELEG_NOTE_RELEASE },
+	{ ZFS_DELEG_PERM_RENAME, ZFS_DELEG_NOTE_RENAME },
+	{ ZFS_DELEG_PERM_ROLLBACK, ZFS_DELEG_NOTE_ROLLBACK },
+	{ ZFS_DELEG_PERM_SEND, ZFS_DELEG_NOTE_SEND },
+	{ ZFS_DELEG_PERM_SHARE, ZFS_DELEG_NOTE_SHARE },
+	{ ZFS_DELEG_PERM_SNAPSHOT, ZFS_DELEG_NOTE_SNAPSHOT },
+
+	{ ZFS_DELEG_PERM_GROUPQUOTA, ZFS_DELEG_NOTE_GROUPQUOTA },
+	{ ZFS_DELEG_PERM_GROUPUSED, ZFS_DELEG_NOTE_GROUPUSED },
+	{ ZFS_DELEG_PERM_USERPROP, ZFS_DELEG_NOTE_USERPROP },
+	{ ZFS_DELEG_PERM_USERQUOTA, ZFS_DELEG_NOTE_USERQUOTA },
+	{ ZFS_DELEG_PERM_USERUSED, ZFS_DELEG_NOTE_USERUSED },
+	{ NULL, ZFS_DELEG_NOTE_NONE }
+};
+
+/* permission structure */
+typedef struct deleg_perm {
+	zfs_deleg_who_type_t	dp_who_type;
+	const char		*dp_name;
+	boolean_t		dp_local;
+	boolean_t		dp_descend;
+} deleg_perm_t;
+
+/* */
+typedef struct deleg_perm_node {
+	deleg_perm_t		dpn_perm;
+
+	uu_avl_node_t		dpn_avl_node;
+} deleg_perm_node_t;
+
+typedef struct fs_perm fs_perm_t;
+
+/* permissions set */
+typedef struct who_perm {
+	zfs_deleg_who_type_t	who_type;
+	const char		*who_name;		/* id */
+	char			who_ug_name[256];	/* user/group name */
+	fs_perm_t		*who_fsperm;		/* uplink */
+
+	uu_avl_t		*who_deleg_perm_avl;	/* permissions */
+} who_perm_t;
+
+/* */
+typedef struct who_perm_node {
+	who_perm_t	who_perm;
+	uu_avl_node_t	who_avl_node;
+} who_perm_node_t;
+
+typedef struct fs_perm_set fs_perm_set_t;
+/* fs permissions */
+struct fs_perm {
+	const char		*fsp_name;
+
+	uu_avl_t		*fsp_sc_avl;	/* sets,create */
+	uu_avl_t		*fsp_uge_avl;	/* user,group,everyone */
+
+	fs_perm_set_t		*fsp_set;	/* uplink */
+};
+
+/* */
+typedef struct fs_perm_node {
+	fs_perm_t	fspn_fsperm;
+	uu_avl_t	*fspn_avl;
+
+	uu_list_node_t	fspn_list_node;
+} fs_perm_node_t;
+
+/* top level structure */
+struct fs_perm_set {
+	uu_list_pool_t	*fsps_list_pool;
+	uu_list_t	*fsps_list; /* list of fs_perms */
+
+	uu_avl_pool_t	*fsps_named_set_avl_pool;
+	uu_avl_pool_t	*fsps_who_perm_avl_pool;
+	uu_avl_pool_t	*fsps_deleg_perm_avl_pool;
+};
+
+static inline const char *
+deleg_perm_type(zfs_deleg_note_t note)
+{
+	/* subcommands */
+	switch (note) {
+		/* SUBCOMMANDS */
+		/* OTHER */
+	case ZFS_DELEG_NOTE_GROUPQUOTA:
+	case ZFS_DELEG_NOTE_GROUPUSED:
+	case ZFS_DELEG_NOTE_USERPROP:
+	case ZFS_DELEG_NOTE_USERQUOTA:
+	case ZFS_DELEG_NOTE_USERUSED:
+		/* other */
+		return (gettext("other"));
+	default:
+		return (gettext("subcommand"));
+	}
+}
+
+static int inline
+who_type2weight(zfs_deleg_who_type_t who_type)
+{
+	int res;
+	switch (who_type) {
+		case ZFS_DELEG_NAMED_SET_SETS:
+		case ZFS_DELEG_NAMED_SET:
+			res = 0;
+			break;
+		case ZFS_DELEG_CREATE_SETS:
+		case ZFS_DELEG_CREATE:
+			res = 1;
+			break;
+		case ZFS_DELEG_USER_SETS:
+		case ZFS_DELEG_USER:
+			res = 2;
+			break;
+		case ZFS_DELEG_GROUP_SETS:
+		case ZFS_DELEG_GROUP:
+			res = 3;
+			break;
+		case ZFS_DELEG_EVERYONE_SETS:
+		case ZFS_DELEG_EVERYONE:
+			res = 4;
+			break;
+		default:
+			res = -1;
+	}
+
+	return (res);
+}
+
+/* ARGSUSED */
+static int
+who_perm_compare(const void *larg, const void *rarg, void *unused)
+{
+	const who_perm_node_t *l = larg;
+	const who_perm_node_t *r = rarg;
+	zfs_deleg_who_type_t ltype = l->who_perm.who_type;
+	zfs_deleg_who_type_t rtype = r->who_perm.who_type;
+	int lweight = who_type2weight(ltype);
+	int rweight = who_type2weight(rtype);
+	int res = lweight - rweight;
+	if (res == 0)
+		res = strncmp(l->who_perm.who_name, r->who_perm.who_name,
+		    ZFS_MAX_DELEG_NAME-1);
+
+	if (res == 0)
+		return (0);
+	if (res > 0)
+		return (1);
+	else
+		return (-1);
+}
+
+/* ARGSUSED */
+static int
+deleg_perm_compare(const void *larg, const void *rarg, void *unused)
+{
+	const deleg_perm_node_t *l = larg;
+	const deleg_perm_node_t *r = rarg;
+	int res =  strncmp(l->dpn_perm.dp_name, r->dpn_perm.dp_name,
+	    ZFS_MAX_DELEG_NAME-1);
+
+	if (res == 0)
+		return (0);
+
+	if (res > 0)
+		return (1);
+	else
+		return (-1);
+}
+
+static inline void
+fs_perm_set_init(fs_perm_set_t *fspset)
+{
+	bzero(fspset, sizeof (fs_perm_set_t));
+
+	if ((fspset->fsps_list_pool = uu_list_pool_create("fsps_list_pool",
+	    sizeof (fs_perm_node_t), offsetof(fs_perm_node_t, fspn_list_node),
+	    NULL, UU_DEFAULT)) == NULL)
+		nomem();
+	if ((fspset->fsps_list = uu_list_create(fspset->fsps_list_pool, NULL,
+	    UU_DEFAULT)) == NULL)
+		nomem();
+
+	if ((fspset->fsps_named_set_avl_pool = uu_avl_pool_create(
+	    "named_set_avl_pool", sizeof (who_perm_node_t), offsetof(
+	    who_perm_node_t, who_avl_node), who_perm_compare,
+	    UU_DEFAULT)) == NULL)
+		nomem();
+
+	if ((fspset->fsps_who_perm_avl_pool = uu_avl_pool_create(
+	    "who_perm_avl_pool", sizeof (who_perm_node_t), offsetof(
+	    who_perm_node_t, who_avl_node), who_perm_compare,
+	    UU_DEFAULT)) == NULL)
+		nomem();
+
+	if ((fspset->fsps_deleg_perm_avl_pool = uu_avl_pool_create(
+	    "deleg_perm_avl_pool", sizeof (deleg_perm_node_t), offsetof(
+	    deleg_perm_node_t, dpn_avl_node), deleg_perm_compare, UU_DEFAULT))
+	    == NULL)
+		nomem();
+}
+
+static inline void fs_perm_fini(fs_perm_t *);
+static inline void who_perm_fini(who_perm_t *);
+
+static inline void
+fs_perm_set_fini(fs_perm_set_t *fspset)
+{
+	fs_perm_node_t *node = uu_list_first(fspset->fsps_list);
+
+	while (node != NULL) {
+		fs_perm_node_t *next_node =
+		    uu_list_next(fspset->fsps_list, node);
+		fs_perm_t *fsperm = &node->fspn_fsperm;
+		fs_perm_fini(fsperm);
+		uu_list_remove(fspset->fsps_list, node);
+		free(node);
+		node = next_node;
+	}
+
+	uu_avl_pool_destroy(fspset->fsps_named_set_avl_pool);
+	uu_avl_pool_destroy(fspset->fsps_who_perm_avl_pool);
+	uu_avl_pool_destroy(fspset->fsps_deleg_perm_avl_pool);
+}
+
+static inline void
+deleg_perm_init(deleg_perm_t *deleg_perm, zfs_deleg_who_type_t type,
+    const char *name)
+{
+	deleg_perm->dp_who_type = type;
+	deleg_perm->dp_name = name;
+}
+
+static inline void
+who_perm_init(who_perm_t *who_perm, fs_perm_t *fsperm,
+    zfs_deleg_who_type_t type, const char *name)
+{
+	uu_avl_pool_t	*pool;
+	pool = fsperm->fsp_set->fsps_deleg_perm_avl_pool;
+
+	bzero(who_perm, sizeof (who_perm_t));
+
+	if ((who_perm->who_deleg_perm_avl = uu_avl_create(pool, NULL,
+	    UU_DEFAULT)) == NULL)
+		nomem();
+
+	who_perm->who_type = type;
+	who_perm->who_name = name;
+	who_perm->who_fsperm = fsperm;
+}
+
+static inline void
+who_perm_fini(who_perm_t *who_perm)
+{
+	deleg_perm_node_t *node = uu_avl_first(who_perm->who_deleg_perm_avl);
+
+	while (node != NULL) {
+		deleg_perm_node_t *next_node =
+		    uu_avl_next(who_perm->who_deleg_perm_avl, node);
+
+		uu_avl_remove(who_perm->who_deleg_perm_avl, node);
+		free(node);
+		node = next_node;
+	}
+
+	uu_avl_destroy(who_perm->who_deleg_perm_avl);
+}
+
+static inline void
+fs_perm_init(fs_perm_t *fsperm, fs_perm_set_t *fspset, const char *fsname)
+{
+	uu_avl_pool_t	*nset_pool = fspset->fsps_named_set_avl_pool;
+	uu_avl_pool_t	*who_pool = fspset->fsps_who_perm_avl_pool;
+
+	bzero(fsperm, sizeof (fs_perm_t));
+
+	if ((fsperm->fsp_sc_avl = uu_avl_create(nset_pool, NULL, UU_DEFAULT))
+	    == NULL)
+		nomem();
+
+	if ((fsperm->fsp_uge_avl = uu_avl_create(who_pool, NULL, UU_DEFAULT))
+	    == NULL)
+		nomem();
+
+	fsperm->fsp_set = fspset;
+	fsperm->fsp_name = fsname;
+}
+
+static inline void
+fs_perm_fini(fs_perm_t *fsperm)
+{
+	who_perm_node_t *node = uu_avl_first(fsperm->fsp_sc_avl);
+	while (node != NULL) {
+		who_perm_node_t *next_node = uu_avl_next(fsperm->fsp_sc_avl,
+		    node);
+		who_perm_t *who_perm = &node->who_perm;
+		who_perm_fini(who_perm);
+		uu_avl_remove(fsperm->fsp_sc_avl, node);
+		free(node);
+		node = next_node;
+	}
+
+	node = uu_avl_first(fsperm->fsp_uge_avl);
+	while (node != NULL) {
+		who_perm_node_t *next_node = uu_avl_next(fsperm->fsp_uge_avl,
+		    node);
+		who_perm_t *who_perm = &node->who_perm;
+		who_perm_fini(who_perm);
+		uu_avl_remove(fsperm->fsp_uge_avl, node);
+		free(node);
+		node = next_node;
+	}
+
+	uu_avl_destroy(fsperm->fsp_sc_avl);
+	uu_avl_destroy(fsperm->fsp_uge_avl);
+}
+
+static void inline
+set_deleg_perm_node(uu_avl_t *avl, deleg_perm_node_t *node,
+    zfs_deleg_who_type_t who_type, const char *name, char locality)
+{
+	uu_avl_index_t idx = 0;
+
+	deleg_perm_node_t *found_node = NULL;
+	deleg_perm_t	*deleg_perm = &node->dpn_perm;
+
+	deleg_perm_init(deleg_perm, who_type, name);
+
+	if ((found_node = uu_avl_find(avl, node, NULL, &idx))
+	    == NULL)
+		uu_avl_insert(avl, node, idx);
+	else {
+		node = found_node;
+		deleg_perm = &node->dpn_perm;
+	}
+
+
+	switch (locality) {
+	case ZFS_DELEG_LOCAL:
+		deleg_perm->dp_local = B_TRUE;
+		break;
+	case ZFS_DELEG_DESCENDENT:
+		deleg_perm->dp_descend = B_TRUE;
+		break;
+	case ZFS_DELEG_NA:
+		break;
+	default:
+		assert(B_FALSE); /* invalid locality */
+	}
+}
+
+static inline int
+parse_who_perm(who_perm_t *who_perm, nvlist_t *nvl, char locality)
+{
+	nvpair_t *nvp = NULL;
+	fs_perm_set_t *fspset = who_perm->who_fsperm->fsp_set;
+	uu_avl_t *avl = who_perm->who_deleg_perm_avl;
+	zfs_deleg_who_type_t who_type = who_perm->who_type;
+
+	while ((nvp = nvlist_next_nvpair(nvl, nvp)) != NULL) {
+		const char *name = nvpair_name(nvp);
+		data_type_t type = nvpair_type(nvp);
+		uu_avl_pool_t *avl_pool = fspset->fsps_deleg_perm_avl_pool;
+		deleg_perm_node_t *node =
+		    safe_malloc(sizeof (deleg_perm_node_t));
+
+		assert(type == DATA_TYPE_BOOLEAN);
+
+		uu_avl_node_init(node, &node->dpn_avl_node, avl_pool);
+		set_deleg_perm_node(avl, node, who_type, name, locality);
+	}
+
+	return (0);
+}
+
+static inline int
+parse_fs_perm(fs_perm_t *fsperm, nvlist_t *nvl)
+{
+	nvpair_t *nvp = NULL;
+	fs_perm_set_t *fspset = fsperm->fsp_set;
+
+	while ((nvp = nvlist_next_nvpair(nvl, nvp)) != NULL) {
+		nvlist_t *nvl2 = NULL;
+		const char *name = nvpair_name(nvp);
+		uu_avl_t *avl = NULL;
+		uu_avl_pool_t *avl_pool;
+		zfs_deleg_who_type_t perm_type = name[0];
+		char perm_locality = name[1];
+		const char *perm_name = name + 3;
+		boolean_t is_set = B_TRUE;
+		who_perm_t *who_perm = NULL;
+
+		assert('$' == name[2]);
+
+		if (nvpair_value_nvlist(nvp, &nvl2) != 0)
+			return (-1);
+
+		switch (perm_type) {
+		case ZFS_DELEG_CREATE:
+		case ZFS_DELEG_CREATE_SETS:
+		case ZFS_DELEG_NAMED_SET:
+		case ZFS_DELEG_NAMED_SET_SETS:
+			avl_pool = fspset->fsps_named_set_avl_pool;
+			avl = fsperm->fsp_sc_avl;
+			break;
+		case ZFS_DELEG_USER:
+		case ZFS_DELEG_USER_SETS:
+		case ZFS_DELEG_GROUP:
+		case ZFS_DELEG_GROUP_SETS:
+		case ZFS_DELEG_EVERYONE:
+		case ZFS_DELEG_EVERYONE_SETS:
+			avl_pool = fspset->fsps_who_perm_avl_pool;
+			avl = fsperm->fsp_uge_avl;
+			break;
+		}
+
+		if (is_set) {
+			who_perm_node_t *found_node = NULL;
+			who_perm_node_t *node = safe_malloc(
+			    sizeof (who_perm_node_t));
+			who_perm = &node->who_perm;
+			uu_avl_index_t idx = 0;
+
+			uu_avl_node_init(node, &node->who_avl_node, avl_pool);
+			who_perm_init(who_perm, fsperm, perm_type, perm_name);
+
+			if ((found_node = uu_avl_find(avl, node, NULL, &idx))
+			    == NULL) {
+				if (avl == fsperm->fsp_uge_avl) {
+					uid_t rid = 0;
+					struct passwd *p = NULL;
+					struct group *g = NULL;
+					const char *nice_name = NULL;
+
+					switch (perm_type) {
+					case ZFS_DELEG_USER_SETS:
+					case ZFS_DELEG_USER:
+						rid = atoi(perm_name);
+						p = getpwuid(rid);
+						if (p)
+							nice_name = p->pw_name;
+						break;
+					case ZFS_DELEG_GROUP_SETS:
+					case ZFS_DELEG_GROUP:
+						rid = atoi(perm_name);
+						g = getgrgid(rid);
+						if (g)
+							nice_name = g->gr_name;
+						break;
+					}
+
+					if (nice_name != NULL)
+						(void) strlcpy(
+						    node->who_perm.who_ug_name,
+						    nice_name, 256);
+				}
+
+				uu_avl_insert(avl, node, idx);
+			} else {
+				node = found_node;
+				who_perm = &node->who_perm;
+			}
+		}
+
+		(void) parse_who_perm(who_perm, nvl2, perm_locality);
+	}
+
+	return (0);
+}
+
+static inline int
+parse_fs_perm_set(fs_perm_set_t *fspset, nvlist_t *nvl)
+{
+	nvpair_t *nvp = NULL;
+	uu_avl_index_t idx = 0;
+
+	while ((nvp = nvlist_next_nvpair(nvl, nvp)) != NULL) {
+		nvlist_t *nvl2 = NULL;
+		const char *fsname = nvpair_name(nvp);
+		data_type_t type = nvpair_type(nvp);
+		fs_perm_t *fsperm = NULL;
+		fs_perm_node_t *node = safe_malloc(sizeof (fs_perm_node_t));
+		if (node == NULL)
+			nomem();
+
+		fsperm = &node->fspn_fsperm;
+
+		assert(DATA_TYPE_NVLIST == type);
+
+		uu_list_node_init(node, &node->fspn_list_node,
+		    fspset->fsps_list_pool);
+
+		idx = uu_list_numnodes(fspset->fsps_list);
+		fs_perm_init(fsperm, fspset, fsname);
+
+		if (nvpair_value_nvlist(nvp, &nvl2) != 0)
+			return (-1);
+
+		(void) parse_fs_perm(fsperm, nvl2);
+
+		uu_list_insert(fspset->fsps_list, node, idx);
+	}
+
+	return (0);
+}
+
+static inline const char *
+deleg_perm_comment(zfs_deleg_note_t note)
+{
+	const char *str = "";
+
+	/* subcommands */
+	switch (note) {
+		/* SUBCOMMANDS */
+	case ZFS_DELEG_NOTE_ALLOW:
+		str = gettext("Must also have the permission that is being"
+		    "\n\t\t\t\tallowed");
+		break;
+	case ZFS_DELEG_NOTE_CLONE:
+		str = gettext("Must also have the 'create' ability and 'mount'"
+		    "\n\t\t\t\tability in the origin file system");
+		break;
+	case ZFS_DELEG_NOTE_CREATE:
+		str = gettext("Must also have the 'mount' ability");
+		break;
+	case ZFS_DELEG_NOTE_DESTROY:
+		str = gettext("Must also have the 'mount' ability");
+		break;
+	case ZFS_DELEG_NOTE_DIFF:
+		str = gettext("Allows lookup of paths within a dataset;"
+		    "\n\t\t\t\tgiven an object number. Ordinary users need this"
+		    "\n\t\t\t\tin order to use zfs diff");
+		break;
+	case ZFS_DELEG_NOTE_HOLD:
+		str = gettext("Allows adding a user hold to a snapshot");
+		break;
+	case ZFS_DELEG_NOTE_MOUNT:
+		str = gettext("Allows mount/umount of ZFS datasets");
+		break;
+	case ZFS_DELEG_NOTE_PROMOTE:
+		str = gettext("Must also have the 'mount'\n\t\t\t\tand"
+		    " 'promote' ability in the origin file system");
+		break;
+	case ZFS_DELEG_NOTE_RECEIVE:
+		str = gettext("Must also have the 'mount' and 'create'"
+		    " ability");
+		break;
+	case ZFS_DELEG_NOTE_RELEASE:
+		str = gettext("Allows releasing a user hold which\n\t\t\t\t"
+		    "might destroy the snapshot");
+		break;
+	case ZFS_DELEG_NOTE_RENAME:
+		str = gettext("Must also have the 'mount' and 'create'"
+		    "\n\t\t\t\tability in the new parent");
+		break;
+	case ZFS_DELEG_NOTE_ROLLBACK:
+		str = gettext("");
+		break;
+	case ZFS_DELEG_NOTE_SEND:
+		str = gettext("");
+		break;
+	case ZFS_DELEG_NOTE_SHARE:
+		str = gettext("Allows sharing file systems over NFS or SMB"
+		    "\n\t\t\t\tprotocols");
+		break;
+	case ZFS_DELEG_NOTE_SNAPSHOT:
+		str = gettext("");
+		break;
+/*
+ *	case ZFS_DELEG_NOTE_VSCAN:
+ *		str = gettext("");
+ *		break;
+ */
+		/* OTHER */
+	case ZFS_DELEG_NOTE_GROUPQUOTA:
+		str = gettext("Allows accessing any groupquota@... property");
+		break;
+	case ZFS_DELEG_NOTE_GROUPUSED:
+		str = gettext("Allows reading any groupused@... property");
+		break;
+	case ZFS_DELEG_NOTE_USERPROP:
+		str = gettext("Allows changing any user property");
+		break;
+	case ZFS_DELEG_NOTE_USERQUOTA:
+		str = gettext("Allows accessing any userquota@... property");
+		break;
+	case ZFS_DELEG_NOTE_USERUSED:
+		str = gettext("Allows reading any userused@... property");
+		break;
+		/* other */
+	default:
+		str = "";
+	}
+
+	return (str);
+}
+
+struct allow_opts {
+	boolean_t local;
+	boolean_t descend;
+	boolean_t user;
+	boolean_t group;
+	boolean_t everyone;
+	boolean_t create;
+	boolean_t set;
+	boolean_t recursive; /* unallow only */
+	boolean_t prt_usage;
+
+	boolean_t prt_perms;
+	char *who;
+	char *perms;
+	const char *dataset;
+};
+
+static inline int
+prop_cmp(const void *a, const void *b)
+{
+	const char *str1 = *(const char **)a;
+	const char *str2 = *(const char **)b;
+	return (strcmp(str1, str2));
+}
+
+static void
+allow_usage(boolean_t un, boolean_t requested, const char *msg)
+{
+	const char *opt_desc[] = {
+		"-h", gettext("show this help message and exit"),
+		"-l", gettext("set permission locally"),
+		"-d", gettext("set permission for descents"),
+		"-u", gettext("set permission for user"),
+		"-g", gettext("set permission for group"),
+		"-e", gettext("set permission for everyone"),
+		"-c", gettext("set create time permission"),
+		"-s", gettext("define permission set"),
+		/* unallow only */
+		"-r", gettext("remove permissions recursively"),
+	};
+	size_t unallow_size = sizeof (opt_desc) / sizeof (char *);
+	size_t allow_size = unallow_size - 2;
+	const char *props[ZFS_NUM_PROPS];
+	int i;
+	size_t count = 0;
+	FILE *fp = requested ? stdout : stderr;
+	zprop_desc_t *pdtbl = zfs_prop_get_table();
+	const char *fmt = gettext("%-16s %-14s\t%s\n");
+
+	(void) fprintf(fp, gettext("Usage: %s\n"), get_usage(un ? HELP_UNALLOW :
+	    HELP_ALLOW));
+	(void) fprintf(fp, gettext("Options:\n"));
+	for (int i = 0; i < (un ? unallow_size : allow_size); i++) {
+		const char *opt = opt_desc[i++];
+		const char *optdsc = opt_desc[i];
+		(void) fprintf(fp, gettext("  %-10s  %s\n"), opt, optdsc);
+	}
+
+	(void) fprintf(fp, gettext("\nThe following permissions are "
+	    "supported:\n\n"));
+	(void) fprintf(fp, fmt, gettext("NAME"), gettext("TYPE"),
+	    gettext("NOTES"));
+	for (i = 0; i < ZFS_NUM_DELEG_NOTES; i++) {
+		const char *perm_name = zfs_deleg_perm_tbl[i].z_perm;
+		zfs_deleg_note_t perm_note = zfs_deleg_perm_tbl[i].z_note;
+		const char *perm_type = deleg_perm_type(perm_note);
+		const char *perm_comment = deleg_perm_comment(perm_note);
+		(void) fprintf(fp, fmt, perm_name, perm_type, perm_comment);
+	}
+
+	for (i = 0; i < ZFS_NUM_PROPS; i++) {
+		zprop_desc_t *pd = &pdtbl[i];
+		if (pd->pd_visible != B_TRUE)
+			continue;
+
+		if (pd->pd_attr == PROP_READONLY)
+			continue;
+
+		props[count++] = pd->pd_name;
+	}
+	props[count] = NULL;
+
+	qsort(props, count, sizeof (char *), prop_cmp);
+
+	for (i = 0; i < count; i++)
+		(void) fprintf(fp, fmt, props[i], gettext("property"), "");
+
+	if (msg != NULL)
+		(void) fprintf(fp, gettext("\nzfs: error: %s"), msg);
+
+	exit(requested ? 0 : 2);
+}
+
+static inline const char *
+munge_args(int argc, char **argv, boolean_t un, size_t expected_argc,
+    char **permsp)
+{
+	if (un && argc == expected_argc - 1)
+		*permsp = NULL;
+	else if (argc == expected_argc)
+		*permsp = argv[argc - 2];
+	else
+		allow_usage(un, B_FALSE,
+		    gettext("wrong number of parameters\n"));
+
+	return (argv[argc - 1]);
+}
+
+static void
+parse_allow_args(int argc, char **argv, boolean_t un, struct allow_opts *opts)
+{
+	int uge_sum = opts->user + opts->group + opts->everyone;
+	int csuge_sum = opts->create + opts->set + uge_sum;
+	int ldcsuge_sum = csuge_sum + opts->local + opts->descend;
+	int all_sum = un ? ldcsuge_sum + opts->recursive : ldcsuge_sum;
+
+	if (uge_sum > 1)
+		allow_usage(un, B_FALSE,
+		    gettext("-u, -g, and -e are mutually exclusive\n"));
+
+	if (opts->prt_usage)
+		if (argc == 0 && all_sum == 0)
+			allow_usage(un, B_TRUE, NULL);
+		else
+			usage(B_FALSE);
+
+	if (opts->set) {
+		if (csuge_sum > 1)
+			allow_usage(un, B_FALSE,
+			    gettext("invalid options combined with -s\n"));
+
+		opts->dataset = munge_args(argc, argv, un, 3, &opts->perms);
+		if (argv[0][0] != '@')
+			allow_usage(un, B_FALSE,
+			    gettext("invalid set name: missing '@' prefix\n"));
+		opts->who = argv[0];
+	} else if (opts->create) {
+		if (ldcsuge_sum > 1)
+			allow_usage(un, B_FALSE,
+			    gettext("invalid options combined with -c\n"));
+		opts->dataset = munge_args(argc, argv, un, 2, &opts->perms);
+	} else if (opts->everyone) {
+		if (csuge_sum > 1)
+			allow_usage(un, B_FALSE,
+			    gettext("invalid options combined with -e\n"));
+		opts->dataset = munge_args(argc, argv, un, 2, &opts->perms);
+	} else if (uge_sum == 0 && argc > 0 && strcmp(argv[0], "everyone")
+	    == 0) {
+		opts->everyone = B_TRUE;
+		argc--;
+		argv++;
+		opts->dataset = munge_args(argc, argv, un, 2, &opts->perms);
+	} else if (argc == 1 && !un) {
+		opts->prt_perms = B_TRUE;
+		opts->dataset = argv[argc-1];
+	} else {
+		opts->dataset = munge_args(argc, argv, un, 3, &opts->perms);
+		opts->who = argv[0];
+	}
+
+	if (!opts->local && !opts->descend) {
+		opts->local = B_TRUE;
+		opts->descend = B_TRUE;
+	}
+}
+
+static void
+store_allow_perm(zfs_deleg_who_type_t type, boolean_t local, boolean_t descend,
+    const char *who, char *perms, nvlist_t *top_nvl)
+{
+	int i;
+	char ld[2] = { '\0', '\0' };
+	char who_buf[ZFS_MAXNAMELEN+32];
+	char base_type;
+	char set_type;
+	nvlist_t *base_nvl = NULL;
+	nvlist_t *set_nvl = NULL;
+	nvlist_t *nvl;
+
+	if (nvlist_alloc(&base_nvl, NV_UNIQUE_NAME, 0) != 0)
+		nomem();
+	if (nvlist_alloc(&set_nvl, NV_UNIQUE_NAME, 0) !=  0)
+		nomem();
+
+	switch (type) {
+	case ZFS_DELEG_NAMED_SET_SETS:
+	case ZFS_DELEG_NAMED_SET:
+		set_type = ZFS_DELEG_NAMED_SET_SETS;
+		base_type = ZFS_DELEG_NAMED_SET;
+		ld[0] = ZFS_DELEG_NA;
+		break;
+	case ZFS_DELEG_CREATE_SETS:
+	case ZFS_DELEG_CREATE:
+		set_type = ZFS_DELEG_CREATE_SETS;
+		base_type = ZFS_DELEG_CREATE;
+		ld[0] = ZFS_DELEG_NA;
+		break;
+	case ZFS_DELEG_USER_SETS:
+	case ZFS_DELEG_USER:
+		set_type = ZFS_DELEG_USER_SETS;
+		base_type = ZFS_DELEG_USER;
+		if (local)
+			ld[0] = ZFS_DELEG_LOCAL;
+		if (descend)
+			ld[1] = ZFS_DELEG_DESCENDENT;
+		break;
+	case ZFS_DELEG_GROUP_SETS:
+	case ZFS_DELEG_GROUP:
+		set_type = ZFS_DELEG_GROUP_SETS;
+		base_type = ZFS_DELEG_GROUP;
+		if (local)
+			ld[0] = ZFS_DELEG_LOCAL;
+		if (descend)
+			ld[1] = ZFS_DELEG_DESCENDENT;
+		break;
+	case ZFS_DELEG_EVERYONE_SETS:
+	case ZFS_DELEG_EVERYONE:
+		set_type = ZFS_DELEG_EVERYONE_SETS;
+		base_type = ZFS_DELEG_EVERYONE;
+		if (local)
+			ld[0] = ZFS_DELEG_LOCAL;
+		if (descend)
+			ld[1] = ZFS_DELEG_DESCENDENT;
+	}
+
+	if (perms != NULL) {
+		char *curr = perms;
+		char *end = curr + strlen(perms);
+
+		while (curr < end) {
+			char *delim = strchr(curr, ',');
+			if (delim == NULL)
+				delim = end;
+			else
+				*delim = '\0';
+
+			if (curr[0] == '@')
+				nvl = set_nvl;
+			else
+				nvl = base_nvl;
+
+			(void) nvlist_add_boolean(nvl, curr);
+			if (delim != end)
+				*delim = ',';
+			curr = delim + 1;
+		}
+
+		for (i = 0; i < 2; i++) {
+			char locality = ld[i];
+			if (locality == 0)
+				continue;
+
+			if (!nvlist_empty(base_nvl)) {
+				if (who != NULL)
+					(void) snprintf(who_buf,
+					    sizeof (who_buf), "%c%c$%s",
+					    base_type, locality, who);
+				else
+					(void) snprintf(who_buf,
+					    sizeof (who_buf), "%c%c$",
+					    base_type, locality);
+
+				(void) nvlist_add_nvlist(top_nvl, who_buf,
+				    base_nvl);
+			}
+
+
+			if (!nvlist_empty(set_nvl)) {
+				if (who != NULL)
+					(void) snprintf(who_buf,
+					    sizeof (who_buf), "%c%c$%s",
+					    set_type, locality, who);
+				else
+					(void) snprintf(who_buf,
+					    sizeof (who_buf), "%c%c$",
+					    set_type, locality);
+
+				(void) nvlist_add_nvlist(top_nvl, who_buf,
+				    set_nvl);
+			}
+		}
+	} else {
+		for (i = 0; i < 2; i++) {
+			char locality = ld[i];
+			if (locality == 0)
+				continue;
+
+			if (who != NULL)
+				(void) snprintf(who_buf, sizeof (who_buf),
+				    "%c%c$%s", base_type, locality, who);
+			else
+				(void) snprintf(who_buf, sizeof (who_buf),
+				    "%c%c$", base_type, locality);
+			(void) nvlist_add_boolean(top_nvl, who_buf);
+
+			if (who != NULL)
+				(void) snprintf(who_buf, sizeof (who_buf),
+				    "%c%c$%s", set_type, locality, who);
+			else
+				(void) snprintf(who_buf, sizeof (who_buf),
+				    "%c%c$", set_type, locality);
+			(void) nvlist_add_boolean(top_nvl, who_buf);
+		}
+	}
+}
+
+static int
+construct_fsacl_list(boolean_t un, struct allow_opts *opts, nvlist_t **nvlp)
+{
+	if (nvlist_alloc(nvlp, NV_UNIQUE_NAME, 0) != 0)
+		nomem();
+
+	if (opts->set) {
+		store_allow_perm(ZFS_DELEG_NAMED_SET, opts->local,
+		    opts->descend, opts->who, opts->perms, *nvlp);
+	} else if (opts->create) {
+		store_allow_perm(ZFS_DELEG_CREATE, opts->local,
+		    opts->descend, NULL, opts->perms, *nvlp);
+	} else if (opts->everyone) {
+		store_allow_perm(ZFS_DELEG_EVERYONE, opts->local,
+		    opts->descend, NULL, opts->perms, *nvlp);
+	} else {
+		char *curr = opts->who;
+		char *end = curr + strlen(curr);
+
+		while (curr < end) {
+			const char *who;
+			zfs_deleg_who_type_t who_type;
+			char *endch;
+			char *delim = strchr(curr, ',');
+			char errbuf[256];
+			char id[64];
+			struct passwd *p = NULL;
+			struct group *g = NULL;
+
+			uid_t rid;
+			if (delim == NULL)
+				delim = end;
+			else
+				*delim = '\0';
+
+			rid = (uid_t)strtol(curr, &endch, 0);
+			if (opts->user) {
+				who_type = ZFS_DELEG_USER;
+				if (*endch != '\0')
+					p = getpwnam(curr);
+				else
+					p = getpwuid(rid);
+
+				if (p != NULL)
+					rid = p->pw_uid;
+				else {
+					(void) snprintf(errbuf, 256, gettext(
+					    "invalid user %s"), curr);
+					allow_usage(un, B_TRUE, errbuf);
+				}
+			} else if (opts->group) {
+				who_type = ZFS_DELEG_GROUP;
+				if (*endch != '\0')
+					g = getgrnam(curr);
+				else
+					g = getgrgid(rid);
+
+				if (g != NULL)
+					rid = g->gr_gid;
+				else {
+					(void) snprintf(errbuf, 256, gettext(
+					    "invalid group %s"),  curr);
+					allow_usage(un, B_TRUE, errbuf);
+				}
+			} else {
+				if (*endch != '\0') {
+					p = getpwnam(curr);
+				} else {
+					p = getpwuid(rid);
+				}
+
+				if (p == NULL)
+					if (*endch != '\0') {
+						g = getgrnam(curr);
+					} else {
+						g = getgrgid(rid);
+					}
+
+				if (p != NULL) {
+					who_type = ZFS_DELEG_USER;
+					rid = p->pw_uid;
+				} else if (g != NULL) {
+					who_type = ZFS_DELEG_GROUP;
+					rid = g->gr_gid;
+				} else {
+					(void) snprintf(errbuf, 256, gettext(
+					    "invalid user/group %s"), curr);
+					allow_usage(un, B_TRUE, errbuf);
+				}
+			}
+
+			(void) sprintf(id, "%u", rid);
+			who = id;
+
+			store_allow_perm(who_type, opts->local,
+			    opts->descend, who, opts->perms, *nvlp);
+			curr = delim + 1;
+		}
+	}
+
+	return (0);
+}
+
+static void
+print_set_creat_perms(uu_avl_t *who_avl)
+{
+	const char *sc_title[] = {
+		gettext("Permission sets:\n"),
+		gettext("Create time permissions:\n"),
+		NULL
+	};
+	const char **title_ptr = sc_title;
+	who_perm_node_t *who_node = NULL;
+	int prev_weight = -1;
+
+	for (who_node = uu_avl_first(who_avl); who_node != NULL;
+	    who_node = uu_avl_next(who_avl, who_node)) {
+		uu_avl_t *avl = who_node->who_perm.who_deleg_perm_avl;
+		zfs_deleg_who_type_t who_type = who_node->who_perm.who_type;
+		const char *who_name = who_node->who_perm.who_name;
+		int weight = who_type2weight(who_type);
+		boolean_t first = B_TRUE;
+		deleg_perm_node_t *deleg_node;
+
+		if (prev_weight != weight) {
+			(void) printf(*title_ptr++);
+			prev_weight = weight;
+		}
+
+		if (who_name == NULL || strnlen(who_name, 1) == 0)
+			(void) printf("\t");
+		else
+			(void) printf("\t%s ", who_name);
+
+		for (deleg_node = uu_avl_first(avl); deleg_node != NULL;
+		    deleg_node = uu_avl_next(avl, deleg_node)) {
+			if (first) {
+				(void) printf("%s",
+				    deleg_node->dpn_perm.dp_name);
+				first = B_FALSE;
+			} else
+				(void) printf(",%s",
+				    deleg_node->dpn_perm.dp_name);
+		}
+
+		(void) printf("\n");
+	}
+}
+
+static void inline
+print_uge_deleg_perms(uu_avl_t *who_avl, boolean_t local, boolean_t descend,
+    const char *title)
+{
+	who_perm_node_t *who_node = NULL;
+	boolean_t prt_title = B_TRUE;
+	uu_avl_walk_t *walk;
+
+	if ((walk = uu_avl_walk_start(who_avl, UU_WALK_ROBUST)) == NULL)
+		nomem();
+
+	while ((who_node = uu_avl_walk_next(walk)) != NULL) {
+		const char *who_name = who_node->who_perm.who_name;
+		const char *nice_who_name = who_node->who_perm.who_ug_name;
+		uu_avl_t *avl = who_node->who_perm.who_deleg_perm_avl;
+		zfs_deleg_who_type_t who_type = who_node->who_perm.who_type;
+		char delim = ' ';
+		deleg_perm_node_t *deleg_node;
+		boolean_t prt_who = B_TRUE;
+
+		for (deleg_node = uu_avl_first(avl);
+		    deleg_node != NULL;
+		    deleg_node = uu_avl_next(avl, deleg_node)) {
+			if (local != deleg_node->dpn_perm.dp_local ||
+			    descend != deleg_node->dpn_perm.dp_descend)
+				continue;
+
+			if (prt_who) {
+				const char *who = NULL;
+				if (prt_title) {
+					prt_title = B_FALSE;
+					(void) printf(title);
+				}
+
+				switch (who_type) {
+				case ZFS_DELEG_USER_SETS:
+				case ZFS_DELEG_USER:
+					who = gettext("user");
+					if (nice_who_name)
+						who_name  = nice_who_name;
+					break;
+				case ZFS_DELEG_GROUP_SETS:
+				case ZFS_DELEG_GROUP:
+					who = gettext("group");
+					if (nice_who_name)
+						who_name  = nice_who_name;
+					break;
+				case ZFS_DELEG_EVERYONE_SETS:
+				case ZFS_DELEG_EVERYONE:
+					who = gettext("everyone");
+					who_name = NULL;
+				}
+
+				prt_who = B_FALSE;
+				if (who_name == NULL)
+					(void) printf("\t%s", who);
+				else
+					(void) printf("\t%s %s", who, who_name);
+			}
+
+			(void) printf("%c%s", delim,
+			    deleg_node->dpn_perm.dp_name);
+			delim = ',';
+		}
+
+		if (!prt_who)
+			(void) printf("\n");
+	}
+
+	uu_avl_walk_end(walk);
+}
+
+static void
+print_fs_perms(fs_perm_set_t *fspset)
+{
+	fs_perm_node_t *node = NULL;
+	char buf[ZFS_MAXNAMELEN+32];
+	const char *dsname = buf;
+
+	for (node = uu_list_first(fspset->fsps_list); node != NULL;
+	    node = uu_list_next(fspset->fsps_list, node)) {
+		uu_avl_t *sc_avl = node->fspn_fsperm.fsp_sc_avl;
+		uu_avl_t *uge_avl = node->fspn_fsperm.fsp_uge_avl;
+		int left = 0;
+
+		(void) snprintf(buf, ZFS_MAXNAMELEN+32,
+		    gettext("---- Permissions on %s "),
+		    node->fspn_fsperm.fsp_name);
+		(void) printf(dsname);
+		left = 70 - strlen(buf);
+		while (left-- > 0)
+			(void) printf("-");
+		(void) printf("\n");
+
+		print_set_creat_perms(sc_avl);
+		print_uge_deleg_perms(uge_avl, B_TRUE, B_FALSE,
+		    gettext("Local permissions:\n"));
+		print_uge_deleg_perms(uge_avl, B_FALSE, B_TRUE,
+		    gettext("Descendent permissions:\n"));
+		print_uge_deleg_perms(uge_avl, B_TRUE, B_TRUE,
+		    gettext("Local+Descendent permissions:\n"));
+	}
+}
+
+static fs_perm_set_t fs_perm_set = { NULL, NULL, NULL, NULL };
+
+struct deleg_perms {
+	boolean_t un;
+	nvlist_t *nvl;
+};
+
+static int
+set_deleg_perms(zfs_handle_t *zhp, void *data)
+{
+	struct deleg_perms *perms = (struct deleg_perms *)data;
+	zfs_type_t zfs_type = zfs_get_type(zhp);
+
+	if (zfs_type != ZFS_TYPE_FILESYSTEM && zfs_type != ZFS_TYPE_VOLUME)
+		return (0);
+
+	return (zfs_set_fsacl(zhp, perms->un, perms->nvl));
+}
+
+static int
+zfs_do_allow_unallow_impl(int argc, char **argv, boolean_t un)
+{
+	zfs_handle_t *zhp;
+	nvlist_t *perm_nvl = NULL;
+	nvlist_t *update_perm_nvl = NULL;
+	int error = 1;
+	int c;
+	struct allow_opts opts = { 0 };
+
+	const char *optstr = un ? "ldugecsrh" : "ldugecsh";
+
+	/* check opts */
+	while ((c = getopt(argc, argv, optstr)) != -1) {
+		switch (c) {
+		case 'l':
+			opts.local = B_TRUE;
+			break;
+		case 'd':
+			opts.descend = B_TRUE;
+			break;
+		case 'u':
+			opts.user = B_TRUE;
+			break;
+		case 'g':
+			opts.group = B_TRUE;
+			break;
+		case 'e':
+			opts.everyone = B_TRUE;
+			break;
+		case 's':
+			opts.set = B_TRUE;
+			break;
+		case 'c':
+			opts.create = B_TRUE;
+			break;
+		case 'r':
+			opts.recursive = B_TRUE;
+			break;
+		case ':':
+			(void) fprintf(stderr, gettext("missing argument for "
+			    "'%c' option\n"), optopt);
+			usage(B_FALSE);
+			break;
+		case 'h':
+			opts.prt_usage = B_TRUE;
+			break;
+		case '?':
+			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
+			    optopt);
+			usage(B_FALSE);
+		}
+	}
+
+	argc -= optind;
+	argv += optind;
+
+	/* check arguments */
+	parse_allow_args(argc, argv, un, &opts);
+
+	/* try to open the dataset */
+	if ((zhp = zfs_open(g_zfs, opts.dataset, ZFS_TYPE_FILESYSTEM |
+	    ZFS_TYPE_VOLUME)) == NULL) {
+		(void) fprintf(stderr, "Failed to open dataset: %s\n",
+		    opts.dataset);
+		return (-1);
+	}
+
+	if (zfs_get_fsacl(zhp, &perm_nvl) != 0)
+		goto cleanup2;
+
+	fs_perm_set_init(&fs_perm_set);
+	if (parse_fs_perm_set(&fs_perm_set, perm_nvl) != 0) {
+		(void) fprintf(stderr, "Failed to parse fsacl permissions\n");
+		goto cleanup1;
+	}
+
+	if (opts.prt_perms)
+		print_fs_perms(&fs_perm_set);
+	else {
+		(void) construct_fsacl_list(un, &opts, &update_perm_nvl);
+		if (zfs_set_fsacl(zhp, un, update_perm_nvl) != 0)
+			goto cleanup0;
+
+		if (un && opts.recursive) {
+			struct deleg_perms data = { un, update_perm_nvl };
+			if (zfs_iter_filesystems(zhp, set_deleg_perms,
+			    &data) != 0)
+				goto cleanup0;
+		}
+	}
+
+	error = 0;
+
+cleanup0:
+	nvlist_free(perm_nvl);
+	if (update_perm_nvl != NULL)
+		nvlist_free(update_perm_nvl);
+cleanup1:
+	fs_perm_set_fini(&fs_perm_set);
+cleanup2:
+	zfs_close(zhp);
+
+	return (error);
+}
+
+/*
+ * zfs allow [-r] [-t] <tag> <snap> ...
+ *
+ *	-r	Recursively hold
+ *	-t	Temporary hold (hidden option)
+ *
+ * Apply a user-hold with the given tag to the list of snapshots.
+ */
+static int
+zfs_do_allow(int argc, char **argv)
+{
+	return (zfs_do_allow_unallow_impl(argc, argv, B_FALSE));
+}
+
+/*
+ * zfs unallow [-r] [-t] <tag> <snap> ...
+ *
+ *	-r	Recursively hold
+ *	-t	Temporary hold (hidden option)
+ *
+ * Apply a user-hold with the given tag to the list of snapshots.
+ */
+static int
+zfs_do_unallow(int argc, char **argv)
+{
+	return (zfs_do_allow_unallow_impl(argc, argv, B_TRUE));
+}
+
+static int
+zfs_do_hold_rele_impl(int argc, char **argv, boolean_t holding)
+{
+	int errors = 0;
+	int i;
+	const char *tag;
+	boolean_t recursive = B_FALSE;
+	boolean_t temphold = B_FALSE;
+	const char *opts = holding ? "rt" : "r";
+	int c;
+
+	/* check options */
+	while ((c = getopt(argc, argv, opts)) != -1) {
+		switch (c) {
+		case 'r':
+			recursive = B_TRUE;
+			break;
+		case 't':
+			temphold = B_TRUE;
+			break;
+		case '?':
+			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
+			    optopt);
+			usage(B_FALSE);
+		}
+	}
+
+	argc -= optind;
+	argv += optind;
+
+	/* check number of arguments */
+	if (argc < 2)
+		usage(B_FALSE);
+
+	tag = argv[0];
+	--argc;
+	++argv;
+
+	if (holding && tag[0] == '.') {
+		/* tags starting with '.' are reserved for libzfs */
+		(void) fprintf(stderr, gettext("tag may not start with '.'\n"));
+		usage(B_FALSE);
+	}
+
+	for (i = 0; i < argc; ++i) {
+		zfs_handle_t *zhp;
+		char parent[ZFS_MAXNAMELEN];
+		const char *delim;
+		char *path = argv[i];
+
+		delim = strchr(path, '@');
+		if (delim == NULL) {
+			(void) fprintf(stderr,
+			    gettext("'%s' is not a snapshot\n"), path);
+			++errors;
+			continue;
+		}
+		(void) strncpy(parent, path, delim - path);
+		parent[delim - path] = '\0';
+
+		zhp = zfs_open(g_zfs, parent,
+		    ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME);
+		if (zhp == NULL) {
+			++errors;
+			continue;
+		}
+		if (holding) {
+			if (zfs_hold(zhp, delim+1, tag, recursive,
+			    temphold, B_FALSE, -1, 0, 0) != 0)
+				++errors;
+		} else {
+			if (zfs_release(zhp, delim+1, tag, recursive) != 0)
+				++errors;
+		}
+		zfs_close(zhp);
+	}
+
+	return (errors != 0);
+}
+
+/*
+ * zfs hold [-r] [-t] <tag> <snap> ...
+ *
+ *	-r	Recursively hold
+ *	-t	Temporary hold (hidden option)
+ *
+ * Apply a user-hold with the given tag to the list of snapshots.
+ */
+static int
+zfs_do_hold(int argc, char **argv)
+{
+	return (zfs_do_hold_rele_impl(argc, argv, B_TRUE));
+}
+
+/*
+ * zfs release [-r] <tag> <snap> ...
+ *
+ *	-r	Recursively release
+ *
+ * Release a user-hold with the given tag from the list of snapshots.
+ */
+static int
+zfs_do_release(int argc, char **argv)
+{
+	return (zfs_do_hold_rele_impl(argc, argv, B_FALSE));
+}
+
+typedef struct holds_cbdata {
+	boolean_t	cb_recursive;
+	const char	*cb_snapname;
+	nvlist_t	**cb_nvlp;
+	size_t		cb_max_namelen;
+	size_t		cb_max_taglen;
+} holds_cbdata_t;
+
+#define	STRFTIME_FMT_STR "%a %b %e %k:%M %Y"
+#define	DATETIME_BUF_LEN (32)
+/*
+ *
+ */
+static void
+print_holds(boolean_t scripted, size_t nwidth, size_t tagwidth, nvlist_t *nvl)
+{
+	int i;
+	nvpair_t *nvp = NULL;
+	char *hdr_cols[] = { "NAME", "TAG", "TIMESTAMP" };
+	const char *col;
+
+	if (!scripted) {
+		for (i = 0; i < 3; i++) {
+			col = gettext(hdr_cols[i]);
+			if (i < 2)
+				(void) printf("%-*s  ", i ? tagwidth : nwidth,
+				    col);
+			else
+				(void) printf("%s\n", col);
+		}
+	}
+
+	while ((nvp = nvlist_next_nvpair(nvl, nvp)) != NULL) {
+		char *zname = nvpair_name(nvp);
+		nvlist_t *nvl2;
+		nvpair_t *nvp2 = NULL;
+		(void) nvpair_value_nvlist(nvp, &nvl2);
+		while ((nvp2 = nvlist_next_nvpair(nvl2, nvp2)) != NULL) {
+			char tsbuf[DATETIME_BUF_LEN];
+			char *tagname = nvpair_name(nvp2);
+			uint64_t val = 0;
+			time_t time;
+			struct tm t;
+			char sep = scripted ? '\t' : ' ';
+			size_t sepnum = scripted ? 1 : 2;
+
+			(void) nvpair_value_uint64(nvp2, &val);
+			time = (time_t)val;
+			(void) localtime_r(&time, &t);
+			(void) strftime(tsbuf, DATETIME_BUF_LEN,
+			    gettext(STRFTIME_FMT_STR), &t);
+
+			(void) printf("%-*s%*c%-*s%*c%s\n", nwidth, zname,
+			    sepnum, sep, tagwidth, tagname, sepnum, sep, tsbuf);
+		}
+	}
+}
+
+/*
+ * Generic callback function to list a dataset or snapshot.
+ */
+static int
+holds_callback(zfs_handle_t *zhp, void *data)
+{
+	holds_cbdata_t *cbp = data;
+	nvlist_t *top_nvl = *cbp->cb_nvlp;
+	nvlist_t *nvl = NULL;
+	nvpair_t *nvp = NULL;
+	const char *zname = zfs_get_name(zhp);
+	size_t znamelen = strnlen(zname, ZFS_MAXNAMELEN);
+
+	if (cbp->cb_recursive) {
+		const char *snapname;
+		char *delim  = strchr(zname, '@');
+		if (delim == NULL)
+			return (0);
+
+		snapname = delim + 1;
+		if (strcmp(cbp->cb_snapname, snapname))
+			return (0);
+	}
+
+	if (zfs_get_holds(zhp, &nvl) != 0)
+		return (-1);
+
+	if (znamelen > cbp->cb_max_namelen)
+		cbp->cb_max_namelen  = znamelen;
+
+	while ((nvp = nvlist_next_nvpair(nvl, nvp)) != NULL) {
+		const char *tag = nvpair_name(nvp);
+		size_t taglen = strnlen(tag, MAXNAMELEN);
+		if (taglen > cbp->cb_max_taglen)
+			cbp->cb_max_taglen  = taglen;
+	}
+
+	return (nvlist_add_nvlist(top_nvl, zname, nvl));
+}
+
+/*
+ * zfs holds [-r] <snap> ...
+ *
+ *	-r	Recursively hold
+ */
+static int
+zfs_do_holds(int argc, char **argv)
+{
+	int errors = 0;
+	int c;
+	int i;
+	boolean_t scripted = B_FALSE;
+	boolean_t recursive = B_FALSE;
+	const char *opts = "rH";
+	nvlist_t *nvl;
+
+	int types = ZFS_TYPE_SNAPSHOT;
+	holds_cbdata_t cb = { 0 };
+
+	int limit = 0;
+	int ret = 0;
+	int flags = 0;
+
+	/* check options */
+	while ((c = getopt(argc, argv, opts)) != -1) {
+		switch (c) {
+		case 'r':
+			recursive = B_TRUE;
+			break;
+		case 'H':
+			scripted = B_TRUE;
+			break;
+		case '?':
+			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
+			    optopt);
+			usage(B_FALSE);
+		}
+	}
+
+	if (recursive) {
+		types |= ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME;
+		flags |= ZFS_ITER_RECURSE;
+	}
+
+	argc -= optind;
+	argv += optind;
+
+	/* check number of arguments */
+	if (argc < 1)
+		usage(B_FALSE);
+
+	if (nvlist_alloc(&nvl, NV_UNIQUE_NAME, 0) != 0)
+		nomem();
+
+	for (i = 0; i < argc; ++i) {
+		char *snapshot = argv[i];
+		const char *delim;
+		const char *snapname;
+
+		delim = strchr(snapshot, '@');
+		if (delim == NULL) {
+			(void) fprintf(stderr,
+			    gettext("'%s' is not a snapshot\n"), snapshot);
+			++errors;
+			continue;
+		}
+		snapname = delim + 1;
+		if (recursive)
+			snapshot[delim - snapshot] = '\0';
+
+		cb.cb_recursive = recursive;
+		cb.cb_snapname = snapname;
+		cb.cb_nvlp = &nvl;
+
+		/*
+		 *  1. collect holds data, set format options
+		 */
+		ret = zfs_for_each(argc, argv, flags, types, NULL, NULL, limit,
+		    holds_callback, &cb);
+		if (ret != 0)
+			++errors;
+	}
+
+	/*
+	 *  2. print holds data
+	 */
+	print_holds(scripted, cb.cb_max_namelen, cb.cb_max_taglen, nvl);
+
+	if (nvlist_empty(nvl))
+		(void) printf(gettext("no datasets available\n"));
+
+	nvlist_free(nvl);
+
+	return (0 != errors);
+}
+
+#define	CHECK_SPINNER 30
+#define	SPINNER_TIME 3		/* seconds */
+#define	MOUNT_TIME 5		/* seconds */
+
+static int
+get_one_dataset(zfs_handle_t *zhp, void *data)
+{
+	static char *spin[] = { "-", "\\", "|", "/" };
+	static int spinval = 0;
+	static int spincheck = 0;
+	static time_t last_spin_time = (time_t)0;
+	get_all_cb_t *cbp = data;
+	zfs_type_t type = zfs_get_type(zhp);
+
+	if (cbp->cb_verbose) {
+		if (--spincheck < 0) {
+			time_t now = time(NULL);
+			if (last_spin_time + SPINNER_TIME < now) {
+				update_progress(spin[spinval++ % 4]);
+				last_spin_time = now;
+			}
+			spincheck = CHECK_SPINNER;
+		}
+	}
+
+	/*
+	 * Interate over any nested datasets.
+	 */
+	if (zfs_iter_filesystems(zhp, get_one_dataset, data) != 0) {
+		zfs_close(zhp);
+		return (1);
+	}
+
+	/*
+	 * Skip any datasets whose type does not match.
+	 */
+	if ((type & ZFS_TYPE_FILESYSTEM) == 0) {
+		zfs_close(zhp);
+		return (0);
+	}
+	libzfs_add_handle(cbp, zhp);
+	assert(cbp->cb_used <= cbp->cb_alloc);
+
+	return (0);
+}
+
+static void
+get_all_datasets(zfs_handle_t ***dslist, size_t *count, boolean_t verbose)
+{
+	get_all_cb_t cb = { 0 };
+	cb.cb_verbose = verbose;
+	cb.cb_getone = get_one_dataset;
+
+	if (verbose)
+		set_progress_header(gettext("Reading ZFS config"));
+	(void) zfs_iter_root(g_zfs, get_one_dataset, &cb);
+
+	*dslist = cb.cb_handles;
+	*count = cb.cb_used;
+
+	if (verbose)
+		finish_progress(gettext("done."));
+}
+
+/*
+ * Generic callback for sharing or mounting filesystems.  Because the code is so
+ * similar, we have a common function with an extra parameter to determine which
+ * mode we are using.
+ */
+#define	OP_SHARE	0x1
+#define	OP_MOUNT	0x2
+
+/*
+ * Share or mount a dataset.
+ */
+static int
+share_mount_one(zfs_handle_t *zhp, int op, int flags, char *protocol,
+    boolean_t explicit, const char *options)
+{
+	char mountpoint[ZFS_MAXPROPLEN];
+	char shareopts[ZFS_MAXPROPLEN];
+	char smbshareopts[ZFS_MAXPROPLEN];
+	const char *cmdname = op == OP_SHARE ? "share" : "mount";
+	struct mnttab mnt;
+	uint64_t zoned, canmount;
+	boolean_t shared_nfs, shared_smb;
+
+	assert(zfs_get_type(zhp) & ZFS_TYPE_FILESYSTEM);
+
+	/*
+	 * Check to make sure we can mount/share this dataset.  If we
+	 * are in the global zone and the filesystem is exported to a
+	 * local zone, or if we are in a local zone and the
+	 * filesystem is not exported, then it is an error.
+	 */
+	zoned = zfs_prop_get_int(zhp, ZFS_PROP_ZONED);
+
+	if (zoned && getzoneid() == GLOBAL_ZONEID) {
+		if (!explicit)
+			return (0);
+
+		(void) fprintf(stderr, gettext("cannot %s '%s': "
+		    "dataset is exported to a local zone\n"), cmdname,
+		    zfs_get_name(zhp));
+		return (1);
+
+	} else if (!zoned && getzoneid() != GLOBAL_ZONEID) {
+		if (!explicit)
+			return (0);
+
+		(void) fprintf(stderr, gettext("cannot %s '%s': "
+		    "permission denied\n"), cmdname,
+		    zfs_get_name(zhp));
+		return (1);
+	}
+
+	/*
+	 * Ignore any filesystems which don't apply to us. This
+	 * includes those with a legacy mountpoint, or those with
+	 * legacy share options.
+	 */
+	verify(zfs_prop_get(zhp, ZFS_PROP_MOUNTPOINT, mountpoint,
+	    sizeof (mountpoint), NULL, NULL, 0, B_FALSE) == 0);
+	verify(zfs_prop_get(zhp, ZFS_PROP_SHARENFS, shareopts,
+	    sizeof (shareopts), NULL, NULL, 0, B_FALSE) == 0);
+	verify(zfs_prop_get(zhp, ZFS_PROP_SHARESMB, smbshareopts,
+	    sizeof (smbshareopts), NULL, NULL, 0, B_FALSE) == 0);
+
+	if (op == OP_SHARE && strcmp(shareopts, "off") == 0 &&
+	    strcmp(smbshareopts, "off") == 0) {
+		if (!explicit)
+			return (0);
+
+		(void) fprintf(stderr, gettext("cannot share '%s': "
+		    "legacy share\n"), zfs_get_name(zhp));
+		(void) fprintf(stderr, gettext("use share(1M) to "
+		    "share this filesystem, or set "
+		    "sharenfs property on\n"));
+		return (1);
+	}
+
+	/*
+	 * We cannot share or mount legacy filesystems. If the
+	 * shareopts is non-legacy but the mountpoint is legacy, we
+	 * treat it as a legacy share.
+	 */
+	if (strcmp(mountpoint, "legacy") == 0) {
+		if (!explicit)
+			return (0);
+
+		(void) fprintf(stderr, gettext("cannot %s '%s': "
+		    "legacy mountpoint\n"), cmdname, zfs_get_name(zhp));
+		(void) fprintf(stderr, gettext("use %s(1M) to "
+		    "%s this filesystem\n"), cmdname, cmdname);
+		return (1);
+	}
+
+	if (strcmp(mountpoint, "none") == 0) {
+		if (!explicit)
+			return (0);
+
+		(void) fprintf(stderr, gettext("cannot %s '%s': no "
+		    "mountpoint set\n"), cmdname, zfs_get_name(zhp));
+		return (1);
+	}
+
+	/*
+	 * canmount	explicit	outcome
+	 * on		no		pass through
+	 * on		yes		pass through
+	 * off		no		return 0
+	 * off		yes		display error, return 1
+	 * noauto	no		return 0
+	 * noauto	yes		pass through
+	 */
+	canmount = zfs_prop_get_int(zhp, ZFS_PROP_CANMOUNT);
+	if (canmount == ZFS_CANMOUNT_OFF) {
+		if (!explicit)
+			return (0);
+
+		(void) fprintf(stderr, gettext("cannot %s '%s': "
+		    "'canmount' property is set to 'off'\n"), cmdname,
+		    zfs_get_name(zhp));
+		return (1);
+	} else if (canmount == ZFS_CANMOUNT_NOAUTO && !explicit) {
+		return (0);
+	}
+
+	/*
+	 * At this point, we have verified that the mountpoint and/or
+	 * shareopts are appropriate for auto management. If the
+	 * filesystem is already mounted or shared, return (failing
+	 * for explicit requests); otherwise mount or share the
+	 * filesystem.
+	 */
+	switch (op) {
+	case OP_SHARE:
+
+		shared_nfs = zfs_is_shared_nfs(zhp, NULL);
+		shared_smb = zfs_is_shared_smb(zhp, NULL);
+
+		if (shared_nfs && shared_smb ||
+		    (shared_nfs && strcmp(shareopts, "on") == 0 &&
+		    strcmp(smbshareopts, "off") == 0) ||
+		    (shared_smb && strcmp(smbshareopts, "on") == 0 &&
+		    strcmp(shareopts, "off") == 0)) {
+			if (!explicit)
+				return (0);
+
+			(void) fprintf(stderr, gettext("cannot share "
+			    "'%s': filesystem already shared\n"),
+			    zfs_get_name(zhp));
+			return (1);
+		}
+
+		if (!zfs_is_mounted(zhp, NULL) &&
+		    zfs_mount(zhp, NULL, 0) != 0)
+			return (1);
+
+		if (protocol == NULL) {
+			if (zfs_shareall(zhp) != 0)
+				return (1);
+		} else if (strcmp(protocol, "nfs") == 0) {
+			if (zfs_share_nfs(zhp))
+				return (1);
+		} else if (strcmp(protocol, "smb") == 0) {
+			if (zfs_share_smb(zhp))
+				return (1);
+		} else {
+			(void) fprintf(stderr, gettext("cannot share "
+			    "'%s': invalid share type '%s' "
+			    "specified\n"),
+			    zfs_get_name(zhp), protocol);
+			return (1);
+		}
+
+		break;
+
+	case OP_MOUNT:
+		if (options == NULL)
+			mnt.mnt_mntopts = "";
+		else
+			mnt.mnt_mntopts = (char *)options;
+
+		if (!hasmntopt(&mnt, MNTOPT_REMOUNT) &&
+		    zfs_is_mounted(zhp, NULL)) {
+			if (!explicit)
+				return (0);
+
+			(void) fprintf(stderr, gettext("cannot mount "
+			    "'%s': filesystem already mounted\n"),
+			    zfs_get_name(zhp));
+			return (1);
+		}
+
+		if (zfs_mount(zhp, options, flags) != 0)
+			return (1);
+		break;
+	}
+
+	return (0);
+}
+
+/*
+ * Reports progress in the form "(current/total)".  Not thread-safe.
+ */
+static void
+report_mount_progress(int current, int total)
+{
+	static time_t last_progress_time = 0;
+	time_t now = time(NULL);
+	char info[32];
+
+	/* report 1..n instead of 0..n-1 */
+	++current;
+
+	/* display header if we're here for the first time */
+	if (current == 1) {
+		set_progress_header(gettext("Mounting ZFS filesystems"));
+	} else if (current != total && last_progress_time + MOUNT_TIME >= now) {
+		/* too soon to report again */
+		return;
+	}
+
+	last_progress_time = now;
+
+	(void) sprintf(info, "(%d/%d)", current, total);
+
+	if (current == total)
+		finish_progress(info);
+	else
+		update_progress(info);
+}
+
+static void
+append_options(char *mntopts, char *newopts)
+{
+	int len = strlen(mntopts);
+
+	/* original length plus new string to append plus 1 for the comma */
+	if (len + 1 + strlen(newopts) >= MNT_LINE_MAX) {
+		(void) fprintf(stderr, gettext("the opts argument for "
+		    "'%c' option is too long (more than %d chars)\n"),
+		    "-o", MNT_LINE_MAX);
+		usage(B_FALSE);
+	}
+
+	if (*mntopts)
+		mntopts[len++] = ',';
+
+	(void) strcpy(&mntopts[len], newopts);
+}
+
+static int
+share_mount(int op, int argc, char **argv)
+{
+	int do_all = 0;
+	boolean_t verbose = B_FALSE;
+	int c, ret = 0;
+	char *options = NULL;
+	int flags = 0;
+
+	/* check options */
+	while ((c = getopt(argc, argv, op == OP_MOUNT ? ":avo:O" : "a"))
+	    != -1) {
+		switch (c) {
+		case 'a':
+			do_all = 1;
+			break;
+		case 'v':
+			verbose = B_TRUE;
+			break;
+		case 'o':
+			if (*optarg == '\0') {
+				(void) fprintf(stderr, gettext("empty mount "
+				    "options (-o) specified\n"));
+				usage(B_FALSE);
+			}
+
+			if (options == NULL)
+				options = safe_malloc(MNT_LINE_MAX + 1);
+
+			/* option validation is done later */
+			append_options(options, optarg);
+			break;
+
+		case 'O':
+			flags |= MS_OVERLAY;
+			break;
+		case ':':
+			(void) fprintf(stderr, gettext("missing argument for "
+			    "'%c' option\n"), optopt);
+			usage(B_FALSE);
+			break;
+		case '?':
+			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
+			    optopt);
+			usage(B_FALSE);
+		}
+	}
+
+	argc -= optind;
+	argv += optind;
+
+	/* check number of arguments */
+	if (do_all) {
+		zfs_handle_t **dslist = NULL;
+		size_t i, count = 0;
+		char *protocol = NULL;
+
+		if (op == OP_SHARE && argc > 0) {
+			if (strcmp(argv[0], "nfs") != 0 &&
+			    strcmp(argv[0], "smb") != 0) {
+				(void) fprintf(stderr, gettext("share type "
+				    "must be 'nfs' or 'smb'\n"));
+				usage(B_FALSE);
+			}
+			protocol = argv[0];
+			argc--;
+			argv++;
+		}
+
+		if (argc != 0) {
+			(void) fprintf(stderr, gettext("too many arguments\n"));
+			usage(B_FALSE);
+		}
+
+		start_progress_timer();
+		get_all_datasets(&dslist, &count, verbose);
+
+		if (count == 0)
+			return (0);
+
+		qsort(dslist, count, sizeof (void *), libzfs_dataset_cmp);
+
+		for (i = 0; i < count; i++) {
+			if (verbose)
+				report_mount_progress(i, count);
+
+			if (share_mount_one(dslist[i], op, flags, protocol,
+			    B_FALSE, options) != 0)
+				ret = 1;
+			zfs_close(dslist[i]);
+		}
+
+		free(dslist);
+	} else if (argc == 0) {
+		struct mnttab entry;
+
+		if ((op == OP_SHARE) || (options != NULL)) {
+			(void) fprintf(stderr, gettext("missing filesystem "
+			    "argument (specify -a for all)\n"));
+			usage(B_FALSE);
+		}
+
+		/*
+		 * When mount is given no arguments, go through /etc/mnttab and
+		 * display any active ZFS mounts.  We hide any snapshots, since
+		 * they are controlled automatically.
+		 */
+		rewind(mnttab_file);
+		while (getmntent(mnttab_file, &entry) == 0) {
+			if (strcmp(entry.mnt_fstype, MNTTYPE_ZFS) != 0 ||
+			    strchr(entry.mnt_special, '@') != NULL)
+				continue;
+
+			(void) printf("%-30s  %s\n", entry.mnt_special,
+			    entry.mnt_mountp);
+		}
+
+	} else {
+		zfs_handle_t *zhp;
+
+		if (argc > 1) {
+			(void) fprintf(stderr,
+			    gettext("too many arguments\n"));
+			usage(B_FALSE);
+		}
+
+		if ((zhp = zfs_open(g_zfs, argv[0],
+		    ZFS_TYPE_FILESYSTEM)) == NULL) {
+			ret = 1;
+		} else {
+			ret = share_mount_one(zhp, op, flags, NULL, B_TRUE,
+			    options);
+			zfs_close(zhp);
+		}
+	}
+
+	return (ret);
+}
+
+/*
+ * zfs mount -a [nfs]
+ * zfs mount filesystem
+ *
+ * Mount all filesystems, or mount the given filesystem.
+ */
+static int
+zfs_do_mount(int argc, char **argv)
+{
+	return (share_mount(OP_MOUNT, argc, argv));
+}
+
+/*
+ * zfs share -a [nfs | smb]
+ * zfs share filesystem
+ *
+ * Share all filesystems, or share the given filesystem.
+ */
+static int
+zfs_do_share(int argc, char **argv)
+{
+	return (share_mount(OP_SHARE, argc, argv));
+}
+
+typedef struct unshare_unmount_node {
+	zfs_handle_t	*un_zhp;
+	char		*un_mountp;
+	uu_avl_node_t	un_avlnode;
+} unshare_unmount_node_t;
+
+/* ARGSUSED */
+static int
+unshare_unmount_compare(const void *larg, const void *rarg, void *unused)
+{
+	const unshare_unmount_node_t *l = larg;
+	const unshare_unmount_node_t *r = rarg;
+
+	return (strcmp(l->un_mountp, r->un_mountp));
+}
+
+/*
+ * Convenience routine used by zfs_do_umount() and manual_unmount().  Given an
+ * absolute path, find the entry /etc/mnttab, verify that its a ZFS filesystem,
+ * and unmount it appropriately.
+ */
+static int
+unshare_unmount_path(int op, char *path, int flags, boolean_t is_manual)
+{
+	zfs_handle_t *zhp;
+	int ret = 0;
+	struct stat64 statbuf;
+	struct extmnttab entry;
+	const char *cmdname = (op == OP_SHARE) ? "unshare" : "unmount";
+	ino_t path_inode;
+
+	/*
+	 * Search for the path in /etc/mnttab.  Rather than looking for the
+	 * specific path, which can be fooled by non-standard paths (i.e. ".."
+	 * or "//"), we stat() the path and search for the corresponding
+	 * (major,minor) device pair.
+	 */
+	if (stat64(path, &statbuf) != 0) {
+		(void) fprintf(stderr, gettext("cannot %s '%s': %s\n"),
+		    cmdname, path, strerror(errno));
+		return (1);
+	}
+	path_inode = statbuf.st_ino;
+
+	/*
+	 * Search for the given (major,minor) pair in the mount table.
+	 */
+	rewind(mnttab_file);
+	while ((ret = getextmntent(mnttab_file, &entry, 0)) == 0) {
+		if (entry.mnt_major == major(statbuf.st_dev) &&
+		    entry.mnt_minor == minor(statbuf.st_dev))
+			break;
+	}
+	if (ret != 0) {
+		if (op == OP_SHARE) {
+			(void) fprintf(stderr, gettext("cannot %s '%s': not "
+			    "currently mounted\n"), cmdname, path);
+			return (1);
+		}
+		(void) fprintf(stderr, gettext("warning: %s not in mnttab\n"),
+		    path);
+		if ((ret = umount2(path, flags)) != 0)
+			(void) fprintf(stderr, gettext("%s: %s\n"), path,
+			    strerror(errno));
+		return (ret != 0);
+	}
+
+	if (strcmp(entry.mnt_fstype, MNTTYPE_ZFS) != 0) {
+		(void) fprintf(stderr, gettext("cannot %s '%s': not a ZFS "
+		    "filesystem\n"), cmdname, path);
+		return (1);
+	}
+
+	if ((zhp = zfs_open(g_zfs, entry.mnt_special,
+	    ZFS_TYPE_FILESYSTEM)) == NULL)
+		return (1);
+
+	ret = 1;
+	if (stat64(entry.mnt_mountp, &statbuf) != 0) {
+		(void) fprintf(stderr, gettext("cannot %s '%s': %s\n"),
+		    cmdname, path, strerror(errno));
+		goto out;
+	} else if (statbuf.st_ino != path_inode) {
+		(void) fprintf(stderr, gettext("cannot "
+		    "%s '%s': not a mountpoint\n"), cmdname, path);
+		goto out;
+	}
+
+	if (op == OP_SHARE) {
+		char nfs_mnt_prop[ZFS_MAXPROPLEN];
+		char smbshare_prop[ZFS_MAXPROPLEN];
+
+		verify(zfs_prop_get(zhp, ZFS_PROP_SHARENFS, nfs_mnt_prop,
+		    sizeof (nfs_mnt_prop), NULL, NULL, 0, B_FALSE) == 0);
+		verify(zfs_prop_get(zhp, ZFS_PROP_SHARESMB, smbshare_prop,
+		    sizeof (smbshare_prop), NULL, NULL, 0, B_FALSE) == 0);
+
+		if (strcmp(nfs_mnt_prop, "off") == 0 &&
+		    strcmp(smbshare_prop, "off") == 0) {
+			(void) fprintf(stderr, gettext("cannot unshare "
+			    "'%s': legacy share\n"), path);
+			(void) fprintf(stderr, gettext("use "
+			    "unshare(1M) to unshare this filesystem\n"));
+		} else if (!zfs_is_shared(zhp)) {
+			(void) fprintf(stderr, gettext("cannot unshare '%s': "
+			    "not currently shared\n"), path);
+		} else {
+			ret = zfs_unshareall_bypath(zhp, path);
+		}
+	} else {
+		char mtpt_prop[ZFS_MAXPROPLEN];
+
+		verify(zfs_prop_get(zhp, ZFS_PROP_MOUNTPOINT, mtpt_prop,
+		    sizeof (mtpt_prop), NULL, NULL, 0, B_FALSE) == 0);
+
+		if (is_manual) {
+			ret = zfs_unmount(zhp, NULL, flags);
+		} else if (strcmp(mtpt_prop, "legacy") == 0) {
+			(void) fprintf(stderr, gettext("cannot unmount "
+			    "'%s': legacy mountpoint\n"),
+			    zfs_get_name(zhp));
+			(void) fprintf(stderr, gettext("use umount(1M) "
+			    "to unmount this filesystem\n"));
+		} else {
+			ret = zfs_unmountall(zhp, flags);
+		}
+	}
+
+out:
+	zfs_close(zhp);
+
+	return (ret != 0);
+}
+
+/*
+ * Generic callback for unsharing or unmounting a filesystem.
+ */
+static int
+unshare_unmount(int op, int argc, char **argv)
+{
+	int do_all = 0;
+	int flags = 0;
+	int ret = 0;
+	int c;
+	zfs_handle_t *zhp;
+	char nfs_mnt_prop[ZFS_MAXPROPLEN];
+	char sharesmb[ZFS_MAXPROPLEN];
+
+	/* check options */
+	while ((c = getopt(argc, argv, op == OP_SHARE ? "a" : "af")) != -1) {
+		switch (c) {
+		case 'a':
+			do_all = 1;
+			break;
+		case 'f':
+			flags = MS_FORCE;
+			break;
+		case '?':
+			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
+			    optopt);
+			usage(B_FALSE);
+		}
+	}
+
+	argc -= optind;
+	argv += optind;
+
+	if (do_all) {
+		/*
+		 * We could make use of zfs_for_each() to walk all datasets in
+		 * the system, but this would be very inefficient, especially
+		 * since we would have to linearly search /etc/mnttab for each
+		 * one.  Instead, do one pass through /etc/mnttab looking for
+		 * zfs entries and call zfs_unmount() for each one.
+		 *
+		 * Things get a little tricky if the administrator has created
+		 * mountpoints beneath other ZFS filesystems.  In this case, we
+		 * have to unmount the deepest filesystems first.  To accomplish
+		 * this, we place all the mountpoints in an AVL tree sorted by
+		 * the special type (dataset name), and walk the result in
+		 * reverse to make sure to get any snapshots first.
+		 */
+		struct mnttab entry;
+		uu_avl_pool_t *pool;
+		uu_avl_t *tree;
+		unshare_unmount_node_t *node;
+		uu_avl_index_t idx;
+		uu_avl_walk_t *walk;
+
+		if (argc != 0) {
+			(void) fprintf(stderr, gettext("too many arguments\n"));
+			usage(B_FALSE);
+		}
+
+		if (((pool = uu_avl_pool_create("unmount_pool",
+		    sizeof (unshare_unmount_node_t),
+		    offsetof(unshare_unmount_node_t, un_avlnode),
+		    unshare_unmount_compare, UU_DEFAULT)) == NULL) ||
+		    ((tree = uu_avl_create(pool, NULL, UU_DEFAULT)) == NULL))
+			nomem();
+
+		rewind(mnttab_file);
+		while (getmntent(mnttab_file, &entry) == 0) {
+
+			/* ignore non-ZFS entries */
+			if (strcmp(entry.mnt_fstype, MNTTYPE_ZFS) != 0)
+				continue;
+
+			/* ignore snapshots */
+			if (strchr(entry.mnt_special, '@') != NULL)
+				continue;
+
+			if ((zhp = zfs_open(g_zfs, entry.mnt_special,
+			    ZFS_TYPE_FILESYSTEM)) == NULL) {
+				ret = 1;
+				continue;
+			}
+
+			switch (op) {
+			case OP_SHARE:
+				verify(zfs_prop_get(zhp, ZFS_PROP_SHARENFS,
+				    nfs_mnt_prop,
+				    sizeof (nfs_mnt_prop),
+				    NULL, NULL, 0, B_FALSE) == 0);
+				if (strcmp(nfs_mnt_prop, "off") != 0)
+					break;
+				verify(zfs_prop_get(zhp, ZFS_PROP_SHARESMB,
+				    nfs_mnt_prop,
+				    sizeof (nfs_mnt_prop),
+				    NULL, NULL, 0, B_FALSE) == 0);
+				if (strcmp(nfs_mnt_prop, "off") == 0)
+					continue;
+				break;
+			case OP_MOUNT:
+				/* Ignore legacy mounts */
+				verify(zfs_prop_get(zhp, ZFS_PROP_MOUNTPOINT,
+				    nfs_mnt_prop,
+				    sizeof (nfs_mnt_prop),
+				    NULL, NULL, 0, B_FALSE) == 0);
+				if (strcmp(nfs_mnt_prop, "legacy") == 0)
+					continue;
+				/* Ignore canmount=noauto mounts */
+				if (zfs_prop_get_int(zhp, ZFS_PROP_CANMOUNT) ==
+				    ZFS_CANMOUNT_NOAUTO)
+					continue;
+			default:
+				break;
+			}
+
+			node = safe_malloc(sizeof (unshare_unmount_node_t));
+			node->un_zhp = zhp;
+			node->un_mountp = safe_strdup(entry.mnt_mountp);
+
+			uu_avl_node_init(node, &node->un_avlnode, pool);
+
+			if (uu_avl_find(tree, node, NULL, &idx) == NULL) {
+				uu_avl_insert(tree, node, idx);
+			} else {
+				zfs_close(node->un_zhp);
+				free(node->un_mountp);
+				free(node);
+			}
+		}
+
+		/*
+		 * Walk the AVL tree in reverse, unmounting each filesystem and
+		 * removing it from the AVL tree in the process.
+		 */
+		if ((walk = uu_avl_walk_start(tree,
+		    UU_WALK_REVERSE | UU_WALK_ROBUST)) == NULL)
+			nomem();
+
+		while ((node = uu_avl_walk_next(walk)) != NULL) {
+			uu_avl_remove(tree, node);
+
+			switch (op) {
+			case OP_SHARE:
+				if (zfs_unshareall_bypath(node->un_zhp,
+				    node->un_mountp) != 0)
+					ret = 1;
+				break;
+
+			case OP_MOUNT:
+				if (zfs_unmount(node->un_zhp,
+				    node->un_mountp, flags) != 0)
+					ret = 1;
+				break;
+			}
+
+			zfs_close(node->un_zhp);
+			free(node->un_mountp);
+			free(node);
+		}
+
+		uu_avl_walk_end(walk);
+		uu_avl_destroy(tree);
+		uu_avl_pool_destroy(pool);
+
+	} else {
+		if (argc != 1) {
+			if (argc == 0)
+				(void) fprintf(stderr,
+				    gettext("missing filesystem argument\n"));
+			else
+				(void) fprintf(stderr,
+				    gettext("too many arguments\n"));
+			usage(B_FALSE);
+		}
+
+		/*
+		 * We have an argument, but it may be a full path or a ZFS
+		 * filesystem.  Pass full paths off to unmount_path() (shared by
+		 * manual_unmount), otherwise open the filesystem and pass to
+		 * zfs_unmount().
+		 */
+		if (argv[0][0] == '/')
+			return (unshare_unmount_path(op, argv[0],
+			    flags, B_FALSE));
+
+		if ((zhp = zfs_open(g_zfs, argv[0],
+		    ZFS_TYPE_FILESYSTEM)) == NULL)
+			return (1);
+
+		verify(zfs_prop_get(zhp, op == OP_SHARE ?
+		    ZFS_PROP_SHARENFS : ZFS_PROP_MOUNTPOINT,
+		    nfs_mnt_prop, sizeof (nfs_mnt_prop), NULL,
+		    NULL, 0, B_FALSE) == 0);
+
+		switch (op) {
+		case OP_SHARE:
+			verify(zfs_prop_get(zhp, ZFS_PROP_SHARENFS,
+			    nfs_mnt_prop,
+			    sizeof (nfs_mnt_prop),
+			    NULL, NULL, 0, B_FALSE) == 0);
+			verify(zfs_prop_get(zhp, ZFS_PROP_SHARESMB,
+			    sharesmb, sizeof (sharesmb), NULL, NULL,
+			    0, B_FALSE) == 0);
+
+			if (strcmp(nfs_mnt_prop, "off") == 0 &&
+			    strcmp(sharesmb, "off") == 0) {
+				(void) fprintf(stderr, gettext("cannot "
+				    "unshare '%s': legacy share\n"),
+				    zfs_get_name(zhp));
+				(void) fprintf(stderr, gettext("use "
+				    "unshare(1M) to unshare this "
+				    "filesystem\n"));
+				ret = 1;
+			} else if (!zfs_is_shared(zhp)) {
+				(void) fprintf(stderr, gettext("cannot "
+				    "unshare '%s': not currently "
+				    "shared\n"), zfs_get_name(zhp));
+				ret = 1;
+			} else if (zfs_unshareall(zhp) != 0) {
+				ret = 1;
+			}
+			break;
+
+		case OP_MOUNT:
+			if (strcmp(nfs_mnt_prop, "legacy") == 0) {
+				(void) fprintf(stderr, gettext("cannot "
+				    "unmount '%s': legacy "
+				    "mountpoint\n"), zfs_get_name(zhp));
+				(void) fprintf(stderr, gettext("use "
+				    "umount(1M) to unmount this "
+				    "filesystem\n"));
+				ret = 1;
+			} else if (!zfs_is_mounted(zhp, NULL)) {
+				(void) fprintf(stderr, gettext("cannot "
+				    "unmount '%s': not currently "
+				    "mounted\n"),
+				    zfs_get_name(zhp));
+				ret = 1;
+			} else if (zfs_unmountall(zhp, flags) != 0) {
+				ret = 1;
+			}
+			break;
+		}
+
+		zfs_close(zhp);
+	}
+
+	return (ret);
+}
+
+/*
+ * zfs unmount -a
+ * zfs unmount filesystem
+ *
+ * Unmount all filesystems, or a specific ZFS filesystem.
+ */
+static int
+zfs_do_unmount(int argc, char **argv)
+{
+	return (unshare_unmount(OP_MOUNT, argc, argv));
+}
+
+/*
+ * zfs unshare -a
+ * zfs unshare filesystem
+ *
+ * Unshare all filesystems, or a specific ZFS filesystem.
+ */
+static int
+zfs_do_unshare(int argc, char **argv)
+{
+	return (unshare_unmount(OP_SHARE, argc, argv));
+}
+
+/*
+ * Called when invoked as /etc/fs/zfs/mount.  Do the mount if the mountpoint is
+ * 'legacy'.  Otherwise, complain that use should be using 'zfs mount'.
+ */
+static int
+manual_mount(int argc, char **argv)
+{
+	zfs_handle_t *zhp;
+	char mountpoint[ZFS_MAXPROPLEN];
+	char mntopts[MNT_LINE_MAX] = { '\0' };
+	int ret = 0;
+	int c;
+	int flags = 0;
+	char *dataset, *path;
+
+	/* check options */
+	while ((c = getopt(argc, argv, ":mo:O")) != -1) {
+		switch (c) {
+		case 'o':
+			(void) strlcpy(mntopts, optarg, sizeof (mntopts));
+			break;
+		case 'O':
+			flags |= MS_OVERLAY;
+			break;
+		case 'm':
+			flags |= MS_NOMNTTAB;
+			break;
+		case ':':
+			(void) fprintf(stderr, gettext("missing argument for "
+			    "'%c' option\n"), optopt);
+			usage(B_FALSE);
+			break;
+		case '?':
+			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
+			    optopt);
+			(void) fprintf(stderr, gettext("usage: mount [-o opts] "
+			    "<path>\n"));
+			return (2);
+		}
+	}
+
+	argc -= optind;
+	argv += optind;
+
+	/* check that we only have two arguments */
+	if (argc != 2) {
+		if (argc == 0)
+			(void) fprintf(stderr, gettext("missing dataset "
+			    "argument\n"));
+		else if (argc == 1)
+			(void) fprintf(stderr,
+			    gettext("missing mountpoint argument\n"));
+		else
+			(void) fprintf(stderr, gettext("too many arguments\n"));
+		(void) fprintf(stderr, "usage: mount <dataset> <mountpoint>\n");
+		return (2);
+	}
+
+	dataset = argv[0];
+	path = argv[1];
+
+	/* try to open the dataset */
+	if ((zhp = zfs_open(g_zfs, dataset, ZFS_TYPE_FILESYSTEM)) == NULL)
+		return (1);
+
+	(void) zfs_prop_get(zhp, ZFS_PROP_MOUNTPOINT, mountpoint,
+	    sizeof (mountpoint), NULL, NULL, 0, B_FALSE);
+
+	/* check for legacy mountpoint and complain appropriately */
+	ret = 0;
+	if (strcmp(mountpoint, ZFS_MOUNTPOINT_LEGACY) == 0) {
+		if (mount(dataset, path, MS_OPTIONSTR | flags, MNTTYPE_ZFS,
+		    NULL, 0, mntopts, sizeof (mntopts)) != 0) {
+			(void) fprintf(stderr, gettext("mount failed: %s\n"),
+			    strerror(errno));
+			ret = 1;
+		}
+	} else {
+		(void) fprintf(stderr, gettext("filesystem '%s' cannot be "
+		    "mounted using 'mount -F zfs'\n"), dataset);
+		(void) fprintf(stderr, gettext("Use 'zfs set mountpoint=%s' "
+		    "instead.\n"), path);
+		(void) fprintf(stderr, gettext("If you must use 'mount -F zfs' "
+		    "or /etc/vfstab, use 'zfs set mountpoint=legacy'.\n"));
+		(void) fprintf(stderr, gettext("See zfs(1M) for more "
+		    "information.\n"));
+		ret = 1;
+	}
+
+	return (ret);
+}
+
+/*
+ * Called when invoked as /etc/fs/zfs/umount.  Unlike a manual mount, we allow
+ * unmounts of non-legacy filesystems, as this is the dominant administrative
+ * interface.
+ */
+static int
+manual_unmount(int argc, char **argv)
+{
+	int flags = 0;
+	int c;
+
+	/* check options */
+	while ((c = getopt(argc, argv, "f")) != -1) {
+		switch (c) {
+		case 'f':
+			flags = MS_FORCE;
+			break;
+		case '?':
+			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
+			    optopt);
+			(void) fprintf(stderr, gettext("usage: unmount [-f] "
+			    "<path>\n"));
+			return (2);
+		}
+	}
+
+	argc -= optind;
+	argv += optind;
+
+	/* check arguments */
+	if (argc != 1) {
+		if (argc == 0)
+			(void) fprintf(stderr, gettext("missing path "
+			    "argument\n"));
+		else
+			(void) fprintf(stderr, gettext("too many arguments\n"));
+		(void) fprintf(stderr, gettext("usage: unmount [-f] <path>\n"));
+		return (2);
+	}
+
+	return (unshare_unmount_path(OP_MOUNT, argv[0], flags, B_TRUE));
+}
+
+static int
+find_command_idx(char *command, int *idx)
+{
+	int i;
+
+	for (i = 0; i < NCOMMAND; i++) {
+		if (command_table[i].name == NULL)
+			continue;
+
+		if (strcmp(command, command_table[i].name) == 0) {
+			*idx = i;
+			return (0);
+		}
+	}
+	return (1);
+}
+
+static int
+zfs_do_diff(int argc, char **argv)
+{
+	zfs_handle_t *zhp;
+	int flags = 0;
+	char *tosnap = NULL;
+	char *fromsnap = NULL;
+	char *atp, *copy;
+	int err = 0;
+	int c;
+
+	while ((c = getopt(argc, argv, "FHt")) != -1) {
+		switch (c) {
+		case 'F':
+			flags |= ZFS_DIFF_CLASSIFY;
+			break;
+		case 'H':
+			flags |= ZFS_DIFF_PARSEABLE;
+			break;
+		case 't':
+			flags |= ZFS_DIFF_TIMESTAMP;
+			break;
+		default:
+			(void) fprintf(stderr,
+			    gettext("invalid option '%c'\n"), optopt);
+			usage(B_FALSE);
+		}
+	}
+
+	argc -= optind;
+	argv += optind;
+
+	if (argc < 1) {
+		(void) fprintf(stderr,
+		gettext("must provide at least one snapshot name\n"));
+		usage(B_FALSE);
+	}
+
+	if (argc > 2) {
+		(void) fprintf(stderr, gettext("too many arguments\n"));
+		usage(B_FALSE);
+	}
+
+	fromsnap = argv[0];
+	tosnap = (argc == 2) ? argv[1] : NULL;
+
+	copy = NULL;
+	if (*fromsnap != '@')
+		copy = strdup(fromsnap);
+	else if (tosnap)
+		copy = strdup(tosnap);
+	if (copy == NULL)
+		usage(B_FALSE);
+
+	if (atp = strchr(copy, '@'))
+		*atp = '\0';
+
+	if ((zhp = zfs_open(g_zfs, copy, ZFS_TYPE_FILESYSTEM)) == NULL)
+		return (1);
+
+	free(copy);
+
+	/*
+	 * Ignore SIGPIPE so that the library can give us
+	 * information on any failure
+	 */
+	(void) sigignore(SIGPIPE);
+
+	err = zfs_show_diffs(zhp, STDOUT_FILENO, fromsnap, tosnap, flags);
+
+	zfs_close(zhp);
+
+	return (err != 0);
+}
+
+int
+main(int argc, char **argv)
+{
+	int ret = 0;
+	int i;
+	char *progname;
+	char *cmdname;
+
+	(void) setlocale(LC_ALL, "");
+	(void) textdomain(TEXT_DOMAIN);
+
+	opterr = 0;
+
+	if ((g_zfs = libzfs_init()) == NULL) {
+		(void) fprintf(stderr, gettext("internal error: failed to "
+		    "initialize ZFS library\n"));
+		return (1);
+	}
+
+	zpool_set_history_str("zfs", argc, argv, history_str);
+	verify(zpool_stage_history(g_zfs, history_str) == 0);
+
+	libzfs_print_on_error(g_zfs, B_TRUE);
+
+	if ((mnttab_file = fopen(MNTTAB, "r")) == NULL) {
+		(void) fprintf(stderr, gettext("internal error: unable to "
+		    "open %s\n"), MNTTAB);
+		return (1);
+	}
+
+	/*
+	 * This command also doubles as the /etc/fs mount and unmount program.
+	 * Determine if we should take this behavior based on argv[0].
+	 */
+	progname = basename(argv[0]);
+	if (strcmp(progname, "mount") == 0) {
+		ret = manual_mount(argc, argv);
+	} else if (strcmp(progname, "umount") == 0) {
+		ret = manual_unmount(argc, argv);
+	} else {
+		/*
+		 * Make sure the user has specified some command.
+		 */
+		if (argc < 2) {
+			(void) fprintf(stderr, gettext("missing command\n"));
+			usage(B_FALSE);
+		}
+
+		cmdname = argv[1];
+
+		/*
+		 * The 'umount' command is an alias for 'unmount'
+		 */
+		if (strcmp(cmdname, "umount") == 0)
+			cmdname = "unmount";
+
+		/*
+		 * The 'recv' command is an alias for 'receive'
+		 */
+		if (strcmp(cmdname, "recv") == 0)
+			cmdname = "receive";
+
+		/*
+		 * Special case '-?'
+		 */
+		if (strcmp(cmdname, "-?") == 0)
+			usage(B_TRUE);
+
+		/*
+		 * Run the appropriate command.
+		 */
+		libzfs_mnttab_cache(g_zfs, B_TRUE);
+		if (find_command_idx(cmdname, &i) == 0) {
+			current_command = &command_table[i];
+			ret = command_table[i].func(argc - 1, argv + 1);
+		} else if (strchr(cmdname, '=') != NULL) {
+			verify(find_command_idx("set", &i) == 0);
+			current_command = &command_table[i];
+			ret = command_table[i].func(argc, argv);
+		} else {
+			(void) fprintf(stderr, gettext("unrecognized "
+			    "command '%s'\n"), cmdname);
+			usage(B_FALSE);
+		}
+		libzfs_mnttab_cache(g_zfs, B_FALSE);
+	}
+
+	(void) fclose(mnttab_file);
+
+	libzfs_fini(g_zfs);
+
+	/*
+	 * The 'ZFS_ABORT' environment variable causes us to dump core on exit
+	 * for the purposes of running ::findleaks.
+	 */
+	if (getenv("ZFS_ABORT") != NULL) {
+		(void) printf("dumping core by request\n");
+		abort();
+	}
+
+	return (ret);
+}