Merge commit 'refs/top-bases/gcc-cast' into gcc-cast

1 files changed, 4229 insertions, 0 deletions

diff --git a/cmd/zfs/zfs_main.c b/cmd/zfs/zfs_main.c
new file mode 100644
index 000000000..b46086c24
--- /dev/null
+++ b/cmd/zfs/zfs_main.c
@@ -0,0 +1,4229 @@
+/*
+ * 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 2008 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#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 <sys/mkdev.h>
+#include <sys/mntent.h>
+#include <sys/mnttab.h>
+#include <sys/mount.h>
+#include <sys/stat.h>
+#include <sys/avl.h>
+
+#include <libzfs.h>
+#include <libuutil.h>
+
+#include "zfs_iter.h"
+#include "zfs_util.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_allow(int argc, char **argv);
+static int zfs_do_unallow(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
+} 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		},
+	{ 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		},
+};
+
+#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 [-rRf] "
+		    "<filesystem|volume|snapshot>\n"));
+	case HELP_GET:
+		return (gettext("\tget [-rHp] [-o field[,...]] "
+		    "[-s source[,...]]\n"
+		    "\t    <\"all\" | property[,...]> "
+		    "[filesystem|volume|snapshot] ...\n"));
+	case HELP_INHERIT:
+		return (gettext("\tinherit [-r] <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] [-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 [-vnF] <filesystem|volume|"
+		"snapshot>\n"
+		"\treceive [-vnF] -d <filesystem>\n"));
+	case HELP_RENAME:
+		return (gettext("\trename <filesystem|volume|snapshot> "
+		    "<filesystem|volume|snapshot>\n"
+		    "\trename -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 [-R] [-[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 [-f] "
+		    "<-a | filesystem|mountpoint>\n"));
+	case HELP_ALLOW:
+		return (gettext("\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"));
+	}
+
+	abort();
+	/* NOTREACHED */
+}
+
+/*
+ * Utility function to guarantee malloc() success.
+ */
+void *
+safe_malloc(size_t size)
+{
+	void *data;
+
+	if ((data = calloc(1, size)) == NULL) {
+		(void) fprintf(stderr, "internal error: out of memory\n");
+		exit(1);
+	}
+
+	return (data);
+}
+
+/*
+ * 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;
+	boolean_t show_permissions = 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 (current_command != NULL &&
+	    (strcmp(current_command->name, "allow") == 0 ||
+	    strcmp(current_command->name, "unallow") == 0))
+		show_permissions = 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, 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"));
+
+	} else if (show_permissions) {
+		(void) fprintf(fp,
+		    gettext("\nThe following permissions are supported:\n"));
+
+		zfs_deleg_permissions();
+	} else {
+		/*
+		 * TRANSLATION NOTE:
+		 * "zfs set|get" must not be localised this is the
+		 * command name and arguments.
+		 */
+
+		(void) fprintf(fp,
+		    gettext("\nFor the property list, run: zfs set|get\n"));
+
+		(void) fprintf(fp,
+		    gettext("\nFor the delegated permission list, run:"
+		    " zfs allow|unallow\n"));
+	}
+
+	/*
+	 * 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) {
+		(void) fprintf(stderr, gettext("internal "
+		    "error: out of memory\n"));
+		return (-1);
+	}
+	return (0);
+
+}
+
+/*
+ * 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;
+	int c;
+
+	if (nvlist_alloc(&props, NV_UNIQUE_NAME, 0) != 0) {
+		(void) fprintf(stderr, gettext("internal error: "
+		    "out of memory\n"));
+		return (1);
+	}
+
+	/* 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 ((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;
+
+	if (nvlist_alloc(&props, NV_UNIQUE_NAME, 0) != 0) {
+		(void) fprintf(stderr, gettext("internal error: "
+		    "out of memory\n"));
+		return (1);
+	}
+
+	/* 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) {
+				(void) fprintf(stderr, gettext("internal "
+				    "error: out of memory\n"));
+				goto error;
+			}
+			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) {
+				(void) fprintf(stderr, gettext("internal "
+				    "error: out of memory\n"));
+				goto error;
+			}
+			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;
+			break;
+		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;
+
+		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) {
+				(void) fprintf(stderr, gettext("internal "
+				    "error: out of memory\n"));
+				nvlist_free(props);
+				return (1);
+			}
+		}
+	}
+
+	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;
+	/*
+	 * if the user doesn't want the dataset automatically mounted,
+	 * then skip the mount/share step
+	 */
+
+	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.
+	 */
+	ret = 0;
+	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 [-rf] <fs, snap, vol>
+ *
+ * 	-r	Recursively destroy all children
+ * 	-R	Recursively destroy all dependents, including clones
+ * 	-f	Force unmounting of any dependents
+ *
+ * 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;
+	int		cb_force;
+	int		cb_recurse;
+	int		cb_error;
+	int		cb_needforce;
+	int		cb_doclones;
+	boolean_t	cb_closezhp;
+	zfs_handle_t	*cb_target;
+	char		*cb_snapname;
+} 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 = 1;
+		}
+
+		(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 = 1;
+		}
+
+		(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 *cbp = data;
+
+	/*
+	 * 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);
+	}
+
+	/*
+	 * Bail out on the first error.
+	 */
+	if (zfs_unmount(zhp, NULL, cbp->cb_force ? MS_FORCE : 0) != 0 ||
+	    zfs_destroy(zhp) != 0) {
+		zfs_close(zhp);
+		return (-1);
+	}
+
+	zfs_close(zhp);
+	return (0);
+}
+
+static int
+destroy_snap_clones(zfs_handle_t *zhp, void *arg)
+{
+	destroy_cbdata_t *cbp = arg;
+	char thissnap[MAXPATHLEN];
+	zfs_handle_t *szhp;
+	boolean_t closezhp = cbp->cb_closezhp;
+	int rv;
+
+	(void) snprintf(thissnap, sizeof (thissnap),
+	    "%s@%s", zfs_get_name(zhp), cbp->cb_snapname);
+
+	libzfs_print_on_error(g_zfs, B_FALSE);
+	szhp = zfs_open(g_zfs, thissnap, ZFS_TYPE_SNAPSHOT);
+	libzfs_print_on_error(g_zfs, B_TRUE);
+	if (szhp) {
+		/*
+		 * Destroy any clones of this snapshot
+		 */
+		if (zfs_iter_dependents(szhp, B_FALSE, destroy_callback,
+		    cbp) != 0) {
+			zfs_close(szhp);
+			if (closezhp)
+				zfs_close(zhp);
+			return (-1);
+		}
+		zfs_close(szhp);
+	}
+
+	cbp->cb_closezhp = B_TRUE;
+	rv = zfs_iter_filesystems(zhp, destroy_snap_clones, arg);
+	if (closezhp)
+		zfs_close(zhp);
+	return (rv);
+}
+
+static int
+zfs_do_destroy(int argc, char **argv)
+{
+	destroy_cbdata_t cb = { 0 };
+	int c;
+	zfs_handle_t *zhp;
+	char *cp;
+
+	/* check options */
+	while ((c = getopt(argc, argv, "frR")) != -1) {
+		switch (c) {
+		case 'f':
+			cb.cb_force = 1;
+			break;
+		case 'r':
+			cb.cb_recurse = 1;
+			break;
+		case 'R':
+			cb.cb_recurse = 1;
+			cb.cb_doclones = 1;
+			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 path argument\n"));
+		usage(B_FALSE);
+	}
+	if (argc > 1) {
+		(void) fprintf(stderr, gettext("too many arguments\n"));
+		usage(B_FALSE);
+	}
+
+	/*
+	 * If we are doing recursive destroy of a snapshot, then the
+	 * named snapshot may not exist.  Go straight to libzfs.
+	 */
+	if (cb.cb_recurse && (cp = strchr(argv[0], '@'))) {
+		int ret;
+
+		*cp = '\0';
+		if ((zhp = zfs_open(g_zfs, argv[0], ZFS_TYPE_DATASET)) == NULL)
+			return (1);
+		*cp = '@';
+		cp++;
+
+		if (cb.cb_doclones) {
+			cb.cb_snapname = cp;
+			if (destroy_snap_clones(zhp, &cb) != 0) {
+				zfs_close(zhp);
+				return (1);
+			}
+		}
+
+		ret = zfs_destroy_snaps(zhp, cp);
+		zfs_close(zhp);
+		if (ret) {
+			(void) fprintf(stderr,
+			    gettext("no snapshots destroyed\n"));
+		}
+		return (ret != 0);
+	}
+
+
+	/* Open the given dataset */
+	if ((zhp = zfs_open(g_zfs, argv[0], ZFS_TYPE_DATASET)) == 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_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);
+}
+
+/*
+ * zfs get [-rHp] [-o 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,source".
+ *		Default is all four.
+ *	-s	Set of sources to allow.  One of
+ *		"local,default,inherited,temporary,none".  Default is all
+ *		five.
+ *	-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];
+	zprop_source_t sourcetype;
+	char source[ZFS_MAXNAMELEN];
+	zprop_get_cbdata_t *cbp = data;
+	nvlist_t *userprop = zfs_get_user_props(zhp);
+	zprop_list_t *pl = cbp->cb_proplist;
+	nvlist_t *propval;
+	char *strval;
+	char *sourceval;
+
+	for (; pl != NULL; pl = pl->pl_next) {
+		/*
+		 * 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));
+			}
+
+			zprop_print_one_property(zfs_get_name(zhp), cbp,
+			    zfs_prop_to_name(pl->pl_prop),
+			    buf, sourcetype, source);
+		} else {
+			if (nvlist_lookup_nvlist(userprop,
+			    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 {
+					sourcetype = ZPROP_SRC_INHERITED;
+					(void) strlcpy(source,
+					    sourceval, sizeof (source));
+				}
+			}
+
+			zprop_print_one_property(zfs_get_name(zhp), cbp,
+			    pl->pl_user_prop, strval, sourcetype,
+			    source);
+		}
+	}
+
+	return (0);
+}
+
+static int
+zfs_do_get(int argc, char **argv)
+{
+	zprop_get_cbdata_t cb = { 0 };
+	int i, c, flags = 0;
+	char *value, *fields;
+	int ret;
+	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, ":o:s:rHp")) != -1) {
+		switch (c) {
+		case 'p':
+			cb.cb_literal = B_TRUE;
+			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", "source",
+				    NULL };
+
+				if (i == 4) {
+					(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_SOURCE;
+					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",
+					"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_TEMPORARY;
+					break;
+				case 4:
+					cb.cb_sources |= ZPROP_SRC_NONE;
+					break;
+				default:
+					(void) fprintf(stderr,
+					    gettext("invalid source "
+					    "'%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, ZFS_TYPE_DATASET, NULL,
+	    &cb.cb_proplist, 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 [-r] <property> <fs|vol> ...
+ *
+ * 	-r	Recurse over all children
+ *
+ * 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.
+ */
+
+static int
+inherit_recurse_cb(zfs_handle_t *zhp, void *data)
+{
+	char *propname = data;
+	zfs_prop_t prop = zfs_name_to_prop(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, propname) != 0);
+}
+
+static int
+inherit_cb(zfs_handle_t *zhp, void *data)
+{
+	char *propname = data;
+
+	return (zfs_prop_inherit(zhp, propname) != 0);
+}
+
+static int
+zfs_do_inherit(int argc, char **argv)
+{
+	int c;
+	zfs_prop_t prop;
+	char *propname;
+	int ret;
+	int flags = 0;
+
+	/* check options */
+	while ((c = getopt(argc, argv, "r")) != -1) {
+		switch (c) {
+		case 'r':
+			flags |= ZFS_ITER_RECURSE;
+			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)) {
+			(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);
+		}
+	} else if (!zfs_prop_user(propname)) {
+		(void) fprintf(stderr, gettext("invalid property '%s'\n"),
+		    propname);
+		usage(B_FALSE);
+	}
+
+	if (flags & ZFS_ITER_RECURSE) {
+		ret = zfs_for_each(argc, argv, flags, ZFS_TYPE_DATASET,
+		    NULL, NULL, inherit_recurse_cb, propname);
+	} else {
+		ret = zfs_for_each(argc, argv, flags, ZFS_TYPE_DATASET,
+		    NULL, NULL, inherit_cb, propname);
+	}
+
+	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);
+
+	if (cb->cb_version >= ZPL_VERSION_FUID) {
+		int spa_version;
+
+		if (zfs_spa_version(zhp, &spa_version) < 0)
+			return (-1);
+
+		if (spa_version < SPA_VERSION_FUID) {
+			/* can't upgrade */
+			(void) printf(gettext("%s: can not be upgraded; "
+			    "the pool version needs to first be upgraded\nto "
+			    "version %llu\n\n"),
+			    zfs_get_name(zhp), SPA_VERSION_FUID);
+			cb->cb_numfailed++;
+			return (0);
+		}
+	}
+
+	/* upgrade */
+	if (version < cb->cb_version) {
+		char verstr[16];
+		(void) snprintf(verstr, sizeof (verstr),
+		    "%llu", (u_longlong_t)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;
+	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 File system "
+		    "unique identifer (FUID)\n"));
+		(void) printf(gettext("\nFor more information on a particular "
+		    "version, including supported releases, see:\n\n"));
+		(void) printf("http://www.opensolaris.org/os/community/zfs/"
+		    "version/zpl/N\n\n");
+		(void) printf(gettext("Where 'N' is the version number.\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, upgrade_set_callback, &cb);
+		(void) printf(gettext("%llu filesystems upgraded\n"),
+		    (u_longlong_t)cb.cb_numupgraded);
+		if (cb.cb_numsamegraded) {
+			(void) printf(gettext("%llu filesystems already at "
+			    "this version\n"),
+			    (u_longlong_t)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, 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, upgrade_list_callback, &cb);
+
+		if (!cb.cb_foundone && !found) {
+			(void) printf(gettext("All filesystems are "
+			    "formatted with the current version.\n"));
+		}
+	}
+
+	return (ret);
+}
+
+/*
+ * list [-rH] [-o property[,property]...] [-t type[,type]...]
+ *      [-s property [-s property]...] [-S property [-S property]...]
+ *      <dataset> ...
+ *
+ * 	-r	Recurse over all children
+ * 	-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", (int)pl->pl_width, header);
+		else
+			(void) printf("%-*s", (int)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;
+		}
+
+		right_justify = 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 (nvlist_lookup_nvlist(userprops,
+			    pl->pl_user_prop, &propval) != 0)
+				propstr = "-";
+			else
+				verify(nvlist_lookup_string(propval,
+				    ZPROP_VALUE, &propstr) == 0);
+		}
+
+		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_FILESYSTEM | ZFS_TYPE_VOLUME;
+	boolean_t types_specified = B_FALSE;
+	char *fields = NULL;
+	list_cbdata_t cb = { 0 };
+	char *value;
+	int ret;
+	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, ":o:rt:Hs:S:")) != -1) {
+		switch (c) {
+		case 'o':
+			fields = optarg;
+			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,
+	    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 <fs | snap | vol> <fs | snap | vol>
+ * zfs rename -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;
+	boolean_t recurse = B_FALSE;
+	boolean_t parents = B_FALSE;
+
+	/* check options */
+	while ((c = getopt(argc, argv, "pr")) != -1) {
+		switch (c) {
+		case 'p':
+			parents = B_TRUE;
+			break;
+		case 'r':
+			recurse = 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) != 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;
+
+	/* 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;
+	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;
+
+	/* 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, 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;
+	char c;
+	nvlist_t *props;
+
+	if (nvlist_alloc(&props, NV_UNIQUE_NAME, 0) != 0) {
+		(void) fprintf(stderr, gettext("internal error: "
+		    "out of memory\n"));
+		return (1);
+	}
+
+	/* 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);
+}
+
+/*
+ * zfs send [-v] -R [-i|-I <@snap>] <fs@snap>
+ * zfs send [-v] [-i|-I <@snap>] <fs@snap>
+ *
+ * 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;
+	boolean_t doall = B_FALSE;
+	boolean_t replicate = B_FALSE;
+	boolean_t fromorigin = B_FALSE;
+	boolean_t verbose = B_FALSE;
+	int c, err;
+
+	/* check options */
+	while ((c = getopt(argc, argv, ":i:I:Rv")) != -1) {
+		switch (c) {
+		case 'i':
+			if (fromname)
+				usage(B_FALSE);
+			fromname = optarg;
+			break;
+		case 'I':
+			if (fromname)
+				usage(B_FALSE);
+			fromname = optarg;
+			doall = B_TRUE;
+			break;
+		case 'R':
+			replicate = B_TRUE;
+			break;
+		case 'v':
+			verbose = 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(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;
+			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 (replicate && fromname == NULL)
+		doall = B_TRUE;
+
+	err = zfs_send(zhp, fromname, toname, replicate, doall, fromorigin,
+	    verbose, STDOUT_FILENO);
+	zfs_close(zhp);
+
+	return (err != 0);
+}
+
+/*
+ * zfs receive [-dnvF] <fs@snap>
+ *
+ * Restore a backup stream from stdin.
+ */
+static int
+zfs_do_receive(int argc, char **argv)
+{
+	int c, err;
+	recvflags_t flags;
+
+	bzero(&flags, sizeof (recvflags_t));
+	/* check options */
+	while ((c = getopt(argc, argv, ":dnvF")) != -1) {
+		switch (c) {
+		case 'd':
+			flags.isprefix = B_TRUE;
+			break;
+		case 'n':
+			flags.dryrun = 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);
+}
+
+typedef struct allow_cb {
+	int  a_permcnt;
+	size_t a_treeoffset;
+} allow_cb_t;
+
+static void
+zfs_print_perms(avl_tree_t *tree)
+{
+	zfs_perm_node_t *permnode;
+
+	permnode = avl_first(tree);
+	while (permnode != NULL) {
+		(void) printf("%s", permnode->z_pname);
+		permnode = AVL_NEXT(tree, permnode);
+		if (permnode)
+			(void) printf(",");
+		else
+			(void) printf("\n");
+	}
+}
+
+/*
+ * Iterate over user/groups/everyone/... and the call perm_iter
+ * function to print actual permission when tree has >0 nodes.
+ */
+static void
+zfs_iter_perms(avl_tree_t *tree, const char *banner, allow_cb_t *cb)
+{
+	zfs_allow_node_t *item;
+	avl_tree_t *ptree;
+
+	item = avl_first(tree);
+	while (item) {
+		ptree = (void *)((char *)item + cb->a_treeoffset);
+		if (avl_numnodes(ptree)) {
+			if (cb->a_permcnt++ == 0)
+				(void) printf("%s\n", banner);
+			(void) printf("\t%s", item->z_key);
+			/*
+			 * Avoid an extra space being printed
+			 * for "everyone" which is keyed with a null
+			 * string
+			 */
+			if (item->z_key[0] != '\0')
+				(void) printf(" ");
+			zfs_print_perms(ptree);
+		}
+		item = AVL_NEXT(tree, item);
+	}
+}
+
+#define	LINES "-------------------------------------------------------------\n"
+static int
+zfs_print_allows(char *ds)
+{
+	zfs_allow_t *curperms, *perms;
+	zfs_handle_t *zhp;
+	allow_cb_t allowcb = { 0 };
+	char banner[MAXPATHLEN];
+
+	if (ds[0] == '-')
+		usage(B_FALSE);
+
+	if (strrchr(ds, '@')) {
+		(void) fprintf(stderr, gettext("Snapshots don't have 'allow'"
+		    " permissions\n"));
+		return (1);
+	}
+	if ((zhp = zfs_open(g_zfs, ds, ZFS_TYPE_DATASET)) == NULL)
+		return (1);
+
+	if (zfs_perm_get(zhp, &perms)) {
+		(void) fprintf(stderr,
+		    gettext("Failed to retrieve 'allows' on %s\n"), ds);
+		zfs_close(zhp);
+		return (1);
+	}
+
+	zfs_close(zhp);
+
+	if (perms != NULL)
+		(void) printf("%s", LINES);
+	for (curperms = perms; curperms; curperms = curperms->z_next) {
+
+		(void) snprintf(banner, sizeof (banner),
+		    "Permission sets on (%s)", curperms->z_setpoint);
+		allowcb.a_treeoffset =
+		    offsetof(zfs_allow_node_t, z_localdescend);
+		allowcb.a_permcnt = 0;
+		zfs_iter_perms(&curperms->z_sets, banner, &allowcb);
+
+		(void) snprintf(banner, sizeof (banner),
+		    "Create time permissions on (%s)", curperms->z_setpoint);
+		allowcb.a_treeoffset =
+		    offsetof(zfs_allow_node_t, z_localdescend);
+		allowcb.a_permcnt = 0;
+		zfs_iter_perms(&curperms->z_crperms, banner, &allowcb);
+
+
+		(void) snprintf(banner, sizeof (banner),
+		    "Local permissions on (%s)", curperms->z_setpoint);
+		allowcb.a_treeoffset = offsetof(zfs_allow_node_t, z_local);
+		allowcb.a_permcnt = 0;
+		zfs_iter_perms(&curperms->z_user, banner, &allowcb);
+		zfs_iter_perms(&curperms->z_group, banner, &allowcb);
+		zfs_iter_perms(&curperms->z_everyone, banner, &allowcb);
+
+		(void) snprintf(banner, sizeof (banner),
+		    "Descendent permissions on (%s)", curperms->z_setpoint);
+		allowcb.a_treeoffset = offsetof(zfs_allow_node_t, z_descend);
+		allowcb.a_permcnt = 0;
+		zfs_iter_perms(&curperms->z_user, banner, &allowcb);
+		zfs_iter_perms(&curperms->z_group, banner, &allowcb);
+		zfs_iter_perms(&curperms->z_everyone, banner, &allowcb);
+
+		(void) snprintf(banner, sizeof (banner),
+		    "Local+Descendent permissions on (%s)",
+		    curperms->z_setpoint);
+		allowcb.a_treeoffset =
+		    offsetof(zfs_allow_node_t, z_localdescend);
+		allowcb.a_permcnt = 0;
+		zfs_iter_perms(&curperms->z_user, banner, &allowcb);
+		zfs_iter_perms(&curperms->z_group, banner, &allowcb);
+		zfs_iter_perms(&curperms->z_everyone, banner, &allowcb);
+
+		(void) printf("%s", LINES);
+	}
+	zfs_free_allows(perms);
+	return (0);
+}
+
+#define	ALLOWOPTIONS "ldcsu:g:e"
+#define	UNALLOWOPTIONS "ldcsu:g:er"
+
+/*
+ * Validate options, and build necessary datastructure to display/remove/add
+ * permissions.
+ * Returns 0 - If permissions should be added/removed
+ * Returns 1 - If permissions should be displayed.
+ * Returns -1 - on failure
+ */
+int
+parse_allow_args(int *argc, char **argv[], boolean_t unallow,
+    char **ds, int *recurse, nvlist_t **zperms)
+{
+	int c;
+	char *options = unallow ? UNALLOWOPTIONS : ALLOWOPTIONS;
+	zfs_deleg_inherit_t deleg_type = ZFS_DELEG_NONE;
+	zfs_deleg_who_type_t who_type = ZFS_DELEG_WHO_UNKNOWN;
+	char *who = NULL;
+	char *perms = NULL;
+	zfs_handle_t *zhp;
+
+	while ((c = getopt(*argc, *argv, options)) != -1) {
+		switch (c) {
+		case 'l':
+			if (who_type == ZFS_DELEG_CREATE ||
+			    who_type == ZFS_DELEG_NAMED_SET)
+				usage(B_FALSE);
+
+			deleg_type |= ZFS_DELEG_PERM_LOCAL;
+			break;
+		case 'd':
+			if (who_type == ZFS_DELEG_CREATE ||
+			    who_type == ZFS_DELEG_NAMED_SET)
+				usage(B_FALSE);
+
+			deleg_type |= ZFS_DELEG_PERM_DESCENDENT;
+			break;
+		case 'r':
+			*recurse = B_TRUE;
+			break;
+		case 'c':
+			if (who_type != ZFS_DELEG_WHO_UNKNOWN)
+				usage(B_FALSE);
+			if (deleg_type)
+				usage(B_FALSE);
+			who_type = ZFS_DELEG_CREATE;
+			break;
+		case 's':
+			if (who_type != ZFS_DELEG_WHO_UNKNOWN)
+				usage(B_FALSE);
+			if (deleg_type)
+				usage(B_FALSE);
+			who_type = ZFS_DELEG_NAMED_SET;
+			break;
+		case 'u':
+			if (who_type != ZFS_DELEG_WHO_UNKNOWN)
+				usage(B_FALSE);
+			who_type = ZFS_DELEG_USER;
+			who = optarg;
+			break;
+		case 'g':
+			if (who_type != ZFS_DELEG_WHO_UNKNOWN)
+				usage(B_FALSE);
+			who_type = ZFS_DELEG_GROUP;
+			who = optarg;
+			break;
+		case 'e':
+			if (who_type != ZFS_DELEG_WHO_UNKNOWN)
+				usage(B_FALSE);
+			who_type = ZFS_DELEG_EVERYONE;
+			break;
+		default:
+			usage(B_FALSE);
+			break;
+		}
+	}
+
+	if (deleg_type == 0)
+		deleg_type = ZFS_DELEG_PERM_LOCALDESCENDENT;
+
+	*argc -= optind;
+	*argv += optind;
+
+	if (unallow == B_FALSE && *argc == 1) {
+		/*
+		 * Only print permissions if no options were processed
+		 */
+		if (optind == 1)
+			return (1);
+		else
+			usage(B_FALSE);
+	}
+
+	/*
+	 * initialize variables for zfs_build_perms based on number
+	 * of arguments.
+	 * 3 arguments ==>	zfs [un]allow joe perm,perm,perm <dataset> or
+	 *			zfs [un]allow -s @set1 perm,perm <dataset>
+	 * 2 arguments ==>	zfs [un]allow -c perm,perm <dataset> or
+	 *			zfs [un]allow -u|-g <name> perm <dataset> or
+	 *			zfs [un]allow -e perm,perm <dataset>
+	 *			zfs unallow joe <dataset>
+	 *			zfs unallow -s @set1 <dataset>
+	 * 1 argument  ==>	zfs [un]allow -e <dataset> or
+	 *			zfs [un]allow -c <dataset>
+	 */
+
+	switch (*argc) {
+	case 3:
+		perms = (*argv)[1];
+		who = (*argv)[0];
+		*ds = (*argv)[2];
+
+		/*
+		 * advance argc/argv for do_allow cases.
+		 * for do_allow case make sure who have a know who type
+		 * and its not a permission set.
+		 */
+		if (unallow == B_TRUE) {
+			*argc -= 2;
+			*argv += 2;
+		} else if (who_type != ZFS_DELEG_WHO_UNKNOWN &&
+		    who_type != ZFS_DELEG_NAMED_SET)
+			usage(B_FALSE);
+		break;
+
+	case 2:
+		if (unallow == B_TRUE && (who_type == ZFS_DELEG_EVERYONE ||
+		    who_type == ZFS_DELEG_CREATE || who != NULL)) {
+			perms = (*argv)[0];
+			*ds = (*argv)[1];
+		} else {
+			if (unallow == B_FALSE &&
+			    (who_type == ZFS_DELEG_WHO_UNKNOWN ||
+			    who_type == ZFS_DELEG_NAMED_SET))
+				usage(B_FALSE);
+			else if (who_type == ZFS_DELEG_WHO_UNKNOWN ||
+			    who_type == ZFS_DELEG_NAMED_SET)
+				who = (*argv)[0];
+			else if (who_type != ZFS_DELEG_NAMED_SET)
+				perms = (*argv)[0];
+			*ds = (*argv)[1];
+		}
+		if (unallow == B_TRUE) {
+			(*argc)--;
+			(*argv)++;
+		}
+		break;
+
+	case 1:
+		if (unallow == B_FALSE)
+			usage(B_FALSE);
+		if (who == NULL && who_type != ZFS_DELEG_CREATE &&
+		    who_type != ZFS_DELEG_EVERYONE)
+			usage(B_FALSE);
+		*ds = (*argv)[0];
+		break;
+
+	default:
+		usage(B_FALSE);
+	}
+
+	if (strrchr(*ds, '@')) {
+		(void) fprintf(stderr,
+		    gettext("Can't set or remove 'allow' permissions "
+		    "on snapshots.\n"));
+			return (-1);
+	}
+
+	if ((zhp = zfs_open(g_zfs, *ds, ZFS_TYPE_DATASET)) == NULL)
+		return (-1);
+
+	if ((zfs_build_perms(zhp, who, perms,
+	    who_type, deleg_type, zperms)) != 0) {
+		zfs_close(zhp);
+		return (-1);
+	}
+	zfs_close(zhp);
+	return (0);
+}
+
+static int
+zfs_do_allow(int argc, char **argv)
+{
+	char *ds;
+	nvlist_t *zperms = NULL;
+	zfs_handle_t *zhp;
+	int unused;
+	int ret;
+
+	if ((ret = parse_allow_args(&argc, &argv, B_FALSE, &ds,
+	    &unused, &zperms)) == -1)
+		return (1);
+
+	if (ret == 1)
+		return (zfs_print_allows(argv[0]));
+
+	if ((zhp = zfs_open(g_zfs, ds, ZFS_TYPE_DATASET)) == NULL)
+		return (1);
+
+	if (zfs_perm_set(zhp, zperms)) {
+		zfs_close(zhp);
+		nvlist_free(zperms);
+		return (1);
+	}
+	nvlist_free(zperms);
+	zfs_close(zhp);
+
+	return (0);
+}
+
+static int
+unallow_callback(zfs_handle_t *zhp, void *data)
+{
+	nvlist_t *nvp = (nvlist_t *)data;
+	int error;
+
+	error = zfs_perm_remove(zhp, nvp);
+	if (error) {
+		(void) fprintf(stderr, gettext("Failed to remove permissions "
+		    "on %s\n"), zfs_get_name(zhp));
+	}
+	return (error);
+}
+
+static int
+zfs_do_unallow(int argc, char **argv)
+{
+	int recurse = B_FALSE;
+	char *ds;
+	int error;
+	nvlist_t *zperms = NULL;
+	int flags = 0;
+
+	if (parse_allow_args(&argc, &argv, B_TRUE,
+	    &ds, &recurse, &zperms) == -1)
+		return (1);
+
+	if (recurse)
+		flags |= ZFS_ITER_RECURSE;
+	error = zfs_for_each(argc, argv, flags,
+	    ZFS_TYPE_FILESYSTEM|ZFS_TYPE_VOLUME, NULL,
+	    NULL, unallow_callback, (void *)zperms);
+
+	if (zperms)
+		nvlist_free(zperms);
+
+	return (error);
+}
+
+typedef struct get_all_cbdata {
+	zfs_handle_t	**cb_handles;
+	size_t		cb_alloc;
+	size_t		cb_used;
+	uint_t		cb_types;
+	boolean_t	cb_verbose;
+} get_all_cbdata_t;
+
+#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_cbdata_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) {
+				(void) printf("\b%c", spin[spinval++ % 4]);
+				(void) fflush(stdout);
+				last_spin_time = now;
+			}
+			spincheck = CHECK_SPINNER;
+		}
+	}
+
+	/*
+	 * Interate over any nested datasets.
+	 */
+	if (type == ZFS_TYPE_FILESYSTEM &&
+	    zfs_iter_filesystems(zhp, get_one_dataset, data) != 0) {
+		zfs_close(zhp);
+		return (1);
+	}
+
+	/*
+	 * Skip any datasets whose type does not match.
+	 */
+	if ((type & cbp->cb_types) == 0) {
+		zfs_close(zhp);
+		return (0);
+	}
+
+	if (cbp->cb_alloc == cbp->cb_used) {
+		zfs_handle_t **handles;
+
+		if (cbp->cb_alloc == 0)
+			cbp->cb_alloc = 64;
+		else
+			cbp->cb_alloc *= 2;
+
+		handles = safe_malloc(cbp->cb_alloc * sizeof (void *));
+
+		if (cbp->cb_handles) {
+			bcopy(cbp->cb_handles, handles,
+			    cbp->cb_used * sizeof (void *));
+			free(cbp->cb_handles);
+		}
+
+		cbp->cb_handles = handles;
+	}
+
+	cbp->cb_handles[cbp->cb_used++] = zhp;
+
+	return (0);
+}
+
+static void
+get_all_datasets(uint_t types, zfs_handle_t ***dslist, size_t *count,
+    boolean_t verbose)
+{
+	get_all_cbdata_t cb = { 0 };
+	cb.cb_types = types;
+	cb.cb_verbose = verbose;
+
+	if (verbose) {
+		(void) printf("%s: *", gettext("Reading ZFS config"));
+		(void) fflush(stdout);
+	}
+
+	(void) zfs_iter_root(g_zfs, get_one_dataset, &cb);
+
+	*dslist = cb.cb_handles;
+	*count = cb.cb_used;
+
+	if (verbose) {
+		(void) printf("\b%s\n", gettext("done."));
+	}
+}
+
+static int
+dataset_cmp(const void *a, const void *b)
+{
+	zfs_handle_t **za = (zfs_handle_t **)a;
+	zfs_handle_t **zb = (zfs_handle_t **)b;
+	char mounta[MAXPATHLEN];
+	char mountb[MAXPATHLEN];
+	boolean_t gota, gotb;
+
+	if ((gota = (zfs_get_type(*za) == ZFS_TYPE_FILESYSTEM)) != 0)
+		verify(zfs_prop_get(*za, ZFS_PROP_MOUNTPOINT, mounta,
+		    sizeof (mounta), NULL, NULL, 0, B_FALSE) == 0);
+	if ((gotb = (zfs_get_type(*zb) == ZFS_TYPE_FILESYSTEM)) != 0)
+		verify(zfs_prop_get(*zb, ZFS_PROP_MOUNTPOINT, mountb,
+		    sizeof (mountb), NULL, NULL, 0, B_FALSE) == 0);
+
+	if (gota && gotb)
+		return (strcmp(mounta, mountb));
+
+	if (gota)
+		return (-1);
+	if (gotb)
+		return (1);
+
+	return (strcmp(zfs_get_name(a), zfs_get_name(b)));
+}
+
+/*
+ * 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;
+	zfs_type_t type = zfs_get_type(zhp);
+	boolean_t shared_nfs, shared_smb;
+
+	assert(type & (ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME));
+
+	if (type == 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);
+		canmount = zfs_prop_get_int(zhp, ZFS_PROP_CANMOUNT);
+
+		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\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
+		 */
+		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;
+		}
+	} else {
+		assert(op == OP_SHARE);
+
+		/*
+		 * Ignore any volumes that aren't shared.
+		 */
+		verify(zfs_prop_get(zhp, ZFS_PROP_SHAREISCSI, shareopts,
+		    sizeof (shareopts), NULL, NULL, 0, B_FALSE) == 0);
+
+		if (strcmp(shareopts, "off") == 0) {
+			if (!explicit)
+				return (0);
+
+			(void) fprintf(stderr, gettext("cannot share '%s': "
+			    "'shareiscsi' property not set\n"),
+			    zfs_get_name(zhp));
+			(void) fprintf(stderr, gettext("set 'shareiscsi' "
+			    "property or use iscsitadm(1M) to share this "
+			    "volume\n"));
+			return (1);
+		}
+
+		if (zfs_is_shared_iscsi(zhp)) {
+			if (!explicit)
+				return (0);
+
+			(void) fprintf(stderr, gettext("cannot share "
+			    "'%s': volume already shared\n"),
+			    zfs_get_name(zhp));
+			return (1);
+		}
+
+		if (zfs_share_iscsi(zhp) != 0)
+			return (1);
+	}
+
+	return (0);
+}
+
+/*
+ * Reports progress in the form "(current/total)".  Not thread-safe.
+ */
+static void
+report_mount_progress(int current, int total)
+{
+	static int len;
+	static char *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\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b";
+	static time_t last_progress_time;
+	time_t now = time(NULL);
+
+	/* report 1..n instead of 0..n-1 */
+	++current;
+
+	/* display header if we're here for the first time */
+	if (current == 1) {
+		(void) printf(gettext("Mounting ZFS filesystems: "));
+		len = 0;
+	} else if (current != total && last_progress_time + MOUNT_TIME >= now) {
+		/* too soon to report again */
+		return;
+	}
+
+	last_progress_time = now;
+
+	/* back up to prepare for overwriting */
+	if (len)
+		(void) printf("%*.*s", len, len, reverse);
+
+	/* We put a newline at the end if this is the last one.  */
+	len = printf("(%d/%d)%s", current, total, current == total ? "\n" : "");
+	(void) fflush(stdout);
+}
+
+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 types, 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_MOUNT) {
+			types = ZFS_TYPE_FILESYSTEM;
+		} else if (argc > 0) {
+			if (strcmp(argv[0], "nfs") == 0 ||
+			    strcmp(argv[0], "smb") == 0) {
+				types = ZFS_TYPE_FILESYSTEM;
+			} else if (strcmp(argv[0], "iscsi") == 0) {
+				types = ZFS_TYPE_VOLUME;
+			} else {
+				(void) fprintf(stderr, gettext("share type "
+				    "must be 'nfs', 'smb' or 'iscsi'\n"));
+				usage(B_FALSE);
+			}
+			protocol = argv[0];
+			argc--;
+			argv++;
+		} else {
+			types = ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME;
+		}
+
+		if (argc != 0) {
+			(void) fprintf(stderr, gettext("too many arguments\n"));
+			usage(B_FALSE);
+		}
+
+		get_all_datasets(types, &dslist, &count, verbose);
+
+		if (count == 0)
+			return (0);
+
+		qsort(dslist, count, sizeof (void *), 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;
+
+		types = ZFS_TYPE_FILESYSTEM;
+		if (op == OP_SHARE)
+			types |= ZFS_TYPE_VOLUME;
+
+		if (argc > 1) {
+			(void) fprintf(stderr,
+			    gettext("too many arguments\n"));
+			usage(B_FALSE);
+		}
+
+		if ((zhp = zfs_open(g_zfs, argv[0], types)) == NULL) {
+			ret = 1;
+		} else {
+			ret = share_mount_one(zhp, op, flags, NULL, B_TRUE,
+			    options);
+			zfs_close(zhp);
+		}
+	}
+
+	return (ret);
+}
+
+/*
+ * zfs mount -a [nfs | iscsi]
+ * 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 | iscsi | 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;
+	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 types, c;
+	zfs_handle_t *zhp;
+	char nfsiscsi_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) {
+			(void) fprintf(stderr, gettext("internal error: "
+			    "out of memory\n"));
+			exit(1);
+		}
+
+		if ((tree = uu_avl_create(pool, NULL, UU_DEFAULT)) == NULL) {
+			(void) fprintf(stderr, gettext("internal error: "
+			    "out of memory\n"));
+			exit(1);
+		}
+
+		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,
+				    nfsiscsi_mnt_prop,
+				    sizeof (nfsiscsi_mnt_prop),
+				    NULL, NULL, 0, B_FALSE) == 0);
+				if (strcmp(nfsiscsi_mnt_prop, "off") != 0)
+					break;
+				verify(zfs_prop_get(zhp, ZFS_PROP_SHARESMB,
+				    nfsiscsi_mnt_prop,
+				    sizeof (nfsiscsi_mnt_prop),
+				    NULL, NULL, 0, B_FALSE) == 0);
+				if (strcmp(nfsiscsi_mnt_prop, "off") == 0)
+					continue;
+				break;
+			case OP_MOUNT:
+				/* Ignore legacy mounts */
+				verify(zfs_prop_get(zhp, ZFS_PROP_MOUNTPOINT,
+				    nfsiscsi_mnt_prop,
+				    sizeof (nfsiscsi_mnt_prop),
+				    NULL, NULL, 0, B_FALSE) == 0);
+				if (strcmp(nfsiscsi_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;
+
+			if ((node->un_mountp = strdup(entry.mnt_mountp)) ==
+			    NULL) {
+				(void) fprintf(stderr, gettext("internal error:"
+				    " out of memory\n"));
+				exit(1);
+			}
+
+			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) {
+			(void) fprintf(stderr,
+			    gettext("internal error: out of memory"));
+			exit(1);
+		}
+
+		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);
+
+		if (op == OP_SHARE) {
+			/*
+			 * Finally, unshare any volumes shared via iSCSI.
+			 */
+			zfs_handle_t **dslist = NULL;
+			size_t i, count = 0;
+
+			get_all_datasets(ZFS_TYPE_VOLUME, &dslist, &count,
+			    B_FALSE);
+
+			if (count != 0) {
+				qsort(dslist, count, sizeof (void *),
+				    dataset_cmp);
+
+				for (i = 0; i < count; i++) {
+					if (zfs_unshare_iscsi(dslist[i]) != 0)
+						ret = 1;
+					zfs_close(dslist[i]);
+				}
+
+				free(dslist);
+			}
+		}
+	} 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));
+
+		types = ZFS_TYPE_FILESYSTEM;
+		if (op == OP_SHARE)
+			types |= ZFS_TYPE_VOLUME;
+
+		if ((zhp = zfs_open(g_zfs, argv[0], types)) == NULL)
+			return (1);
+
+		if (zfs_get_type(zhp) == ZFS_TYPE_FILESYSTEM) {
+			verify(zfs_prop_get(zhp, op == OP_SHARE ?
+			    ZFS_PROP_SHARENFS : ZFS_PROP_MOUNTPOINT,
+			    nfsiscsi_mnt_prop, sizeof (nfsiscsi_mnt_prop), NULL,
+			    NULL, 0, B_FALSE) == 0);
+
+			switch (op) {
+			case OP_SHARE:
+				verify(zfs_prop_get(zhp, ZFS_PROP_SHARENFS,
+				    nfsiscsi_mnt_prop,
+				    sizeof (nfsiscsi_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(nfsiscsi_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(nfsiscsi_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;
+			}
+		} else {
+			assert(op == OP_SHARE);
+
+			verify(zfs_prop_get(zhp, ZFS_PROP_SHAREISCSI,
+			    nfsiscsi_mnt_prop, sizeof (nfsiscsi_mnt_prop),
+			    NULL, NULL, 0, B_FALSE) == 0);
+
+			if (strcmp(nfsiscsi_mnt_prop, "off") == 0) {
+				(void) fprintf(stderr, gettext("cannot unshare "
+				    "'%s': 'shareiscsi' property not set\n"),
+				    zfs_get_name(zhp));
+				(void) fprintf(stderr, gettext("set "
+				    "'shareiscsi' property or use "
+				    "iscsitadm(1M) to share this volume\n"));
+				ret = 1;
+			} else if (!zfs_is_shared_iscsi(zhp)) {
+				(void) fprintf(stderr, gettext("cannot "
+				    "unshare '%s': not currently shared\n"),
+				    zfs_get_name(zhp));
+				ret = 1;
+			} else if (zfs_unshare_iscsi(zhp) != 0) {
+				ret = 1;
+			}
+		}
+
+		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;
+	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
+volcheck(zpool_handle_t *zhp, void *data)
+{
+	boolean_t isinit = *((boolean_t *)data);
+
+	if (isinit)
+		return (zpool_create_zvol_links(zhp));
+	else
+		return (zpool_remove_zvol_links(zhp));
+}
+
+/*
+ * Iterate over all pools in the system and either create or destroy /dev/zvol
+ * links, depending on the value of 'isinit'.
+ */
+static int
+do_volcheck(boolean_t isinit)
+{
+	return (zpool_iter(g_zfs, volcheck, &isinit) ? 1 : 0);
+}
+
+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);
+}
+
+int
+main(int argc, char **argv)
+{
+	int ret;
+	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);
+
+		/*
+		 * 'volinit' and 'volfini' do not appear in the usage message,
+		 * so we have to special case them here.
+		 */
+		if (strcmp(cmdname, "volinit") == 0)
+			return (do_volcheck(B_TRUE));
+		else if (strcmp(cmdname, "volfini") == 0)
+			return (do_volcheck(B_FALSE));
+
+		/*
+		 * Run the appropriate command.
+		 */
+		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);
+		}
+	}
+
+	(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);
+}