xref: /illumos-gate/usr/src/cmd/zfs/zfs_main.c (revision 635216b673cf196ac523ff2a7ab715717e553292)
1 /*
2  * CDDL HEADER START
3  *
4  * The contents of this file are subject to the terms of the
5  * Common Development and Distribution License (the "License").
6  * You may not use this file except in compliance with the License.
7  *
8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9  * or http://www.opensolaris.org/os/licensing.
10  * See the License for the specific language governing permissions
11  * and limitations under the License.
12  *
13  * When distributing Covered Code, include this CDDL HEADER in each
14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15  * If applicable, add the following below this CDDL HEADER, with the
16  * fields enclosed by brackets "[]" replaced with your own identifying
17  * information: Portions Copyright [yyyy] [name of copyright owner]
18  *
19  * CDDL HEADER END
20  */
21 
22 /*
23  * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
24  * Use is subject to license terms.
25  */
26 
27 #include <assert.h>
28 #include <ctype.h>
29 #include <errno.h>
30 #include <libgen.h>
31 #include <libintl.h>
32 #include <libuutil.h>
33 #include <libnvpair.h>
34 #include <locale.h>
35 #include <stddef.h>
36 #include <stdio.h>
37 #include <stdlib.h>
38 #include <strings.h>
39 #include <unistd.h>
40 #include <fcntl.h>
41 #include <zone.h>
42 #include <grp.h>
43 #include <pwd.h>
44 #include <sys/mkdev.h>
45 #include <sys/mntent.h>
46 #include <sys/mnttab.h>
47 #include <sys/mount.h>
48 #include <sys/stat.h>
49 #include <sys/fs/zfs.h>
50 
51 #include <libzfs.h>
52 #include <libuutil.h>
53 
54 #include "zfs_iter.h"
55 #include "zfs_util.h"
56 
57 libzfs_handle_t *g_zfs;
58 
59 static FILE *mnttab_file;
60 static char history_str[HIS_MAX_RECORD_LEN];
61 const char *pypath = "/usr/lib/zfs/pyzfs.py";
62 
63 static int zfs_do_clone(int argc, char **argv);
64 static int zfs_do_create(int argc, char **argv);
65 static int zfs_do_destroy(int argc, char **argv);
66 static int zfs_do_get(int argc, char **argv);
67 static int zfs_do_inherit(int argc, char **argv);
68 static int zfs_do_list(int argc, char **argv);
69 static int zfs_do_mount(int argc, char **argv);
70 static int zfs_do_rename(int argc, char **argv);
71 static int zfs_do_rollback(int argc, char **argv);
72 static int zfs_do_set(int argc, char **argv);
73 static int zfs_do_upgrade(int argc, char **argv);
74 static int zfs_do_snapshot(int argc, char **argv);
75 static int zfs_do_unmount(int argc, char **argv);
76 static int zfs_do_share(int argc, char **argv);
77 static int zfs_do_unshare(int argc, char **argv);
78 static int zfs_do_send(int argc, char **argv);
79 static int zfs_do_receive(int argc, char **argv);
80 static int zfs_do_promote(int argc, char **argv);
81 static int zfs_do_userspace(int argc, char **argv);
82 static int zfs_do_python(int argc, char **argv);
83 static int zfs_do_hold(int argc, char **argv);
84 static int zfs_do_release(int argc, char **argv);
85 
86 /*
87  * Enable a reasonable set of defaults for libumem debugging on DEBUG builds.
88  */
89 
90 #ifdef DEBUG
91 const char *
92 _umem_debug_init(void)
93 {
94 	return ("default,verbose"); /* $UMEM_DEBUG setting */
95 }
96 
97 const char *
98 _umem_logging_init(void)
99 {
100 	return ("fail,contents"); /* $UMEM_LOGGING setting */
101 }
102 #endif
103 
104 typedef enum {
105 	HELP_CLONE,
106 	HELP_CREATE,
107 	HELP_DESTROY,
108 	HELP_GET,
109 	HELP_INHERIT,
110 	HELP_UPGRADE,
111 	HELP_LIST,
112 	HELP_MOUNT,
113 	HELP_PROMOTE,
114 	HELP_RECEIVE,
115 	HELP_RENAME,
116 	HELP_ROLLBACK,
117 	HELP_SEND,
118 	HELP_SET,
119 	HELP_SHARE,
120 	HELP_SNAPSHOT,
121 	HELP_UNMOUNT,
122 	HELP_UNSHARE,
123 	HELP_ALLOW,
124 	HELP_UNALLOW,
125 	HELP_USERSPACE,
126 	HELP_GROUPSPACE,
127 	HELP_HOLD,
128 	HELP_HOLDS,
129 	HELP_RELEASE
130 } zfs_help_t;
131 
132 typedef struct zfs_command {
133 	const char	*name;
134 	int		(*func)(int argc, char **argv);
135 	zfs_help_t	usage;
136 } zfs_command_t;
137 
138 /*
139  * Master command table.  Each ZFS command has a name, associated function, and
140  * usage message.  The usage messages need to be internationalized, so we have
141  * to have a function to return the usage message based on a command index.
142  *
143  * These commands are organized according to how they are displayed in the usage
144  * message.  An empty command (one with a NULL name) indicates an empty line in
145  * the generic usage message.
146  */
147 static zfs_command_t command_table[] = {
148 	{ "create",	zfs_do_create,		HELP_CREATE		},
149 	{ "destroy",	zfs_do_destroy,		HELP_DESTROY		},
150 	{ NULL },
151 	{ "snapshot",	zfs_do_snapshot,	HELP_SNAPSHOT		},
152 	{ "rollback",	zfs_do_rollback,	HELP_ROLLBACK		},
153 	{ "clone",	zfs_do_clone,		HELP_CLONE		},
154 	{ "promote",	zfs_do_promote,		HELP_PROMOTE		},
155 	{ "rename",	zfs_do_rename,		HELP_RENAME		},
156 	{ NULL },
157 	{ "list",	zfs_do_list,		HELP_LIST		},
158 	{ NULL },
159 	{ "set",	zfs_do_set,		HELP_SET		},
160 	{ "get", 	zfs_do_get,		HELP_GET		},
161 	{ "inherit",	zfs_do_inherit,		HELP_INHERIT		},
162 	{ "upgrade",	zfs_do_upgrade,		HELP_UPGRADE		},
163 	{ "userspace",	zfs_do_userspace,	HELP_USERSPACE		},
164 	{ "groupspace",	zfs_do_userspace,	HELP_GROUPSPACE		},
165 	{ NULL },
166 	{ "mount",	zfs_do_mount,		HELP_MOUNT		},
167 	{ "unmount",	zfs_do_unmount,		HELP_UNMOUNT		},
168 	{ "share",	zfs_do_share,		HELP_SHARE		},
169 	{ "unshare",	zfs_do_unshare,		HELP_UNSHARE		},
170 	{ NULL },
171 	{ "send",	zfs_do_send,		HELP_SEND		},
172 	{ "receive",	zfs_do_receive,		HELP_RECEIVE		},
173 	{ NULL },
174 	{ "allow",	zfs_do_python,		HELP_ALLOW		},
175 	{ NULL },
176 	{ "unallow",	zfs_do_python,		HELP_UNALLOW		},
177 	{ NULL },
178 	{ "hold",	zfs_do_hold,		HELP_HOLD		},
179 	{ "holds",	zfs_do_python,		HELP_HOLDS		},
180 	{ "release",	zfs_do_release,		HELP_RELEASE		},
181 };
182 
183 #define	NCOMMAND	(sizeof (command_table) / sizeof (command_table[0]))
184 
185 zfs_command_t *current_command;
186 
187 static const char *
188 get_usage(zfs_help_t idx)
189 {
190 	switch (idx) {
191 	case HELP_CLONE:
192 		return (gettext("\tclone [-p] [-o property=value] ... "
193 		    "<snapshot> <filesystem|volume>\n"));
194 	case HELP_CREATE:
195 		return (gettext("\tcreate [-p] [-o property=value] ... "
196 		    "<filesystem>\n"
197 		    "\tcreate [-ps] [-b blocksize] [-o property=value] ... "
198 		    "-V <size> <volume>\n"));
199 	case HELP_DESTROY:
200 		return (gettext("\tdestroy [-rRf] <filesystem|volume>\n"
201 		    "\tdestroy [-rRd] <snapshot>\n"));
202 	case HELP_GET:
203 		return (gettext("\tget [-rHp] [-d max] "
204 		    "[-o field[,...]] [-s source[,...]]\n"
205 		    "\t    <\"all\" | property[,...]> "
206 		    "[filesystem|volume|snapshot] ...\n"));
207 	case HELP_INHERIT:
208 		return (gettext("\tinherit [-r] <property> "
209 		    "<filesystem|volume|snapshot> ...\n"));
210 	case HELP_UPGRADE:
211 		return (gettext("\tupgrade [-v]\n"
212 		    "\tupgrade [-r] [-V version] <-a | filesystem ...>\n"));
213 	case HELP_LIST:
214 		return (gettext("\tlist [-rH][-d max] "
215 		    "[-o property[,...]] [-t type[,...]] [-s property] ...\n"
216 		    "\t    [-S property] ... "
217 		    "[filesystem|volume|snapshot] ...\n"));
218 	case HELP_MOUNT:
219 		return (gettext("\tmount\n"
220 		    "\tmount [-vO] [-o opts] <-a | filesystem>\n"));
221 	case HELP_PROMOTE:
222 		return (gettext("\tpromote <clone-filesystem>\n"));
223 	case HELP_RECEIVE:
224 		return (gettext("\treceive [-vnF] <filesystem|volume|"
225 		"snapshot>\n"
226 		"\treceive [-vnF] -d <filesystem>\n"));
227 	case HELP_RENAME:
228 		return (gettext("\trename <filesystem|volume|snapshot> "
229 		    "<filesystem|volume|snapshot>\n"
230 		    "\trename -p <filesystem|volume> <filesystem|volume>\n"
231 		    "\trename -r <snapshot> <snapshot>"));
232 	case HELP_ROLLBACK:
233 		return (gettext("\trollback [-rRf] <snapshot>\n"));
234 	case HELP_SEND:
235 		return (gettext("\tsend [-R] [-[iI] snapshot] <snapshot>\n"));
236 	case HELP_SET:
237 		return (gettext("\tset <property=value> "
238 		    "<filesystem|volume|snapshot> ...\n"));
239 	case HELP_SHARE:
240 		return (gettext("\tshare <-a | filesystem>\n"));
241 	case HELP_SNAPSHOT:
242 		return (gettext("\tsnapshot [-r] [-o property=value] ... "
243 		    "<filesystem@snapname|volume@snapname>\n"));
244 	case HELP_UNMOUNT:
245 		return (gettext("\tunmount [-f] "
246 		    "<-a | filesystem|mountpoint>\n"));
247 	case HELP_UNSHARE:
248 		return (gettext("\tunshare "
249 		    "<-a | filesystem|mountpoint>\n"));
250 	case HELP_ALLOW:
251 		return (gettext("\tallow <filesystem|volume>\n"
252 		    "\tallow [-ldug] "
253 		    "<\"everyone\"|user|group>[,...] <perm|@setname>[,...]\n"
254 		    "\t    <filesystem|volume>\n"
255 		    "\tallow [-ld] -e <perm|@setname>[,...] "
256 		    "<filesystem|volume>\n"
257 		    "\tallow -c <perm|@setname>[,...] <filesystem|volume>\n"
258 		    "\tallow -s @setname <perm|@setname>[,...] "
259 		    "<filesystem|volume>\n"));
260 	case HELP_UNALLOW:
261 		return (gettext("\tunallow [-rldug] "
262 		    "<\"everyone\"|user|group>[,...]\n"
263 		    "\t    [<perm|@setname>[,...]] <filesystem|volume>\n"
264 		    "\tunallow [-rld] -e [<perm|@setname>[,...]] "
265 		    "<filesystem|volume>\n"
266 		    "\tunallow [-r] -c [<perm|@setname>[,...]] "
267 		    "<filesystem|volume>\n"
268 		    "\tunallow [-r] -s @setname [<perm|@setname>[,...]] "
269 		    "<filesystem|volume>\n"));
270 	case HELP_USERSPACE:
271 		return (gettext("\tuserspace [-hniHp] [-o field[,...]] "
272 		    "[-sS field] ... [-t type[,...]]\n"
273 		    "\t    <filesystem|snapshot>\n"));
274 	case HELP_GROUPSPACE:
275 		return (gettext("\tgroupspace [-hniHpU] [-o field[,...]] "
276 		    "[-sS field] ... [-t type[,...]]\n"
277 		    "\t    <filesystem|snapshot>\n"));
278 	case HELP_HOLD:
279 		return (gettext("\thold [-r] <tag> <snapshot> ...\n"));
280 	case HELP_HOLDS:
281 		return (gettext("\tholds [-r] <snapshot> ...\n"));
282 	case HELP_RELEASE:
283 		return (gettext("\trelease [-r] <tag> <snapshot> ...\n"));
284 	}
285 
286 	abort();
287 	/* NOTREACHED */
288 }
289 
290 /*
291  * Utility function to guarantee malloc() success.
292  */
293 void *
294 safe_malloc(size_t size)
295 {
296 	void *data;
297 
298 	if ((data = calloc(1, size)) == NULL) {
299 		(void) fprintf(stderr, "internal error: out of memory\n");
300 		exit(1);
301 	}
302 
303 	return (data);
304 }
305 
306 /*
307  * Callback routine that will print out information for each of
308  * the properties.
309  */
310 static int
311 usage_prop_cb(int prop, void *cb)
312 {
313 	FILE *fp = cb;
314 
315 	(void) fprintf(fp, "\t%-15s ", zfs_prop_to_name(prop));
316 
317 	if (zfs_prop_readonly(prop))
318 		(void) fprintf(fp, " NO    ");
319 	else
320 		(void) fprintf(fp, "YES    ");
321 
322 	if (zfs_prop_inheritable(prop))
323 		(void) fprintf(fp, "  YES   ");
324 	else
325 		(void) fprintf(fp, "   NO   ");
326 
327 	if (zfs_prop_values(prop) == NULL)
328 		(void) fprintf(fp, "-\n");
329 	else
330 		(void) fprintf(fp, "%s\n", zfs_prop_values(prop));
331 
332 	return (ZPROP_CONT);
333 }
334 
335 /*
336  * Display usage message.  If we're inside a command, display only the usage for
337  * that command.  Otherwise, iterate over the entire command table and display
338  * a complete usage message.
339  */
340 static void
341 usage(boolean_t requested)
342 {
343 	int i;
344 	boolean_t show_properties = B_FALSE;
345 	FILE *fp = requested ? stdout : stderr;
346 
347 	if (current_command == NULL) {
348 
349 		(void) fprintf(fp, gettext("usage: zfs command args ...\n"));
350 		(void) fprintf(fp,
351 		    gettext("where 'command' is one of the following:\n\n"));
352 
353 		for (i = 0; i < NCOMMAND; i++) {
354 			if (command_table[i].name == NULL)
355 				(void) fprintf(fp, "\n");
356 			else
357 				(void) fprintf(fp, "%s",
358 				    get_usage(command_table[i].usage));
359 		}
360 
361 		(void) fprintf(fp, gettext("\nEach dataset is of the form: "
362 		    "pool/[dataset/]*dataset[@name]\n"));
363 	} else {
364 		(void) fprintf(fp, gettext("usage:\n"));
365 		(void) fprintf(fp, "%s", get_usage(current_command->usage));
366 	}
367 
368 	if (current_command != NULL &&
369 	    (strcmp(current_command->name, "set") == 0 ||
370 	    strcmp(current_command->name, "get") == 0 ||
371 	    strcmp(current_command->name, "inherit") == 0 ||
372 	    strcmp(current_command->name, "list") == 0))
373 		show_properties = B_TRUE;
374 
375 	if (show_properties) {
376 		(void) fprintf(fp,
377 		    gettext("\nThe following properties are supported:\n"));
378 
379 		(void) fprintf(fp, "\n\t%-14s %s  %s   %s\n\n",
380 		    "PROPERTY", "EDIT", "INHERIT", "VALUES");
381 
382 		/* Iterate over all properties */
383 		(void) zprop_iter(usage_prop_cb, fp, B_FALSE, B_TRUE,
384 		    ZFS_TYPE_DATASET);
385 
386 		(void) fprintf(fp, "\t%-15s ", "userused@...");
387 		(void) fprintf(fp, " NO       NO   <size>\n");
388 		(void) fprintf(fp, "\t%-15s ", "groupused@...");
389 		(void) fprintf(fp, " NO       NO   <size>\n");
390 		(void) fprintf(fp, "\t%-15s ", "userquota@...");
391 		(void) fprintf(fp, "YES       NO   <size> | none\n");
392 		(void) fprintf(fp, "\t%-15s ", "groupquota@...");
393 		(void) fprintf(fp, "YES       NO   <size> | none\n");
394 
395 		(void) fprintf(fp, gettext("\nSizes are specified in bytes "
396 		    "with standard units such as K, M, G, etc.\n"));
397 		(void) fprintf(fp, gettext("\nUser-defined properties can "
398 		    "be specified by using a name containing a colon (:).\n"));
399 		(void) fprintf(fp, gettext("\nThe {user|group}{used|quota}@ "
400 		    "properties must be appended with\n"
401 		    "a user or group specifier of one of these forms:\n"
402 		    "    POSIX name      (eg: \"matt\")\n"
403 		    "    POSIX id        (eg: \"126829\")\n"
404 		    "    SMB name@domain (eg: \"matt@sun\")\n"
405 		    "    SMB SID         (eg: \"S-1-234-567-89\")\n"));
406 	} else {
407 		(void) fprintf(fp,
408 		    gettext("\nFor the property list, run: %s\n"),
409 		    "zfs set|get");
410 		(void) fprintf(fp,
411 		    gettext("\nFor the delegated permission list, run: %s\n"),
412 		    "zfs allow|unallow");
413 	}
414 
415 	/*
416 	 * See comments at end of main().
417 	 */
418 	if (getenv("ZFS_ABORT") != NULL) {
419 		(void) printf("dumping core by request\n");
420 		abort();
421 	}
422 
423 	exit(requested ? 0 : 2);
424 }
425 
426 static int
427 parseprop(nvlist_t *props)
428 {
429 	char *propname = optarg;
430 	char *propval, *strval;
431 
432 	if ((propval = strchr(propname, '=')) == NULL) {
433 		(void) fprintf(stderr, gettext("missing "
434 		    "'=' for -o option\n"));
435 		return (-1);
436 	}
437 	*propval = '\0';
438 	propval++;
439 	if (nvlist_lookup_string(props, propname, &strval) == 0) {
440 		(void) fprintf(stderr, gettext("property '%s' "
441 		    "specified multiple times\n"), propname);
442 		return (-1);
443 	}
444 	if (nvlist_add_string(props, propname, propval) != 0) {
445 		(void) fprintf(stderr, gettext("internal "
446 		    "error: out of memory\n"));
447 		return (-1);
448 	}
449 	return (0);
450 }
451 
452 static int
453 parse_depth(char *opt, int *flags)
454 {
455 	char *tmp;
456 	int depth;
457 
458 	depth = (int)strtol(opt, &tmp, 0);
459 	if (*tmp) {
460 		(void) fprintf(stderr,
461 		    gettext("%s is not an integer\n"), optarg);
462 		usage(B_FALSE);
463 	}
464 	if (depth < 0) {
465 		(void) fprintf(stderr,
466 		    gettext("Depth can not be negative.\n"));
467 		usage(B_FALSE);
468 	}
469 	*flags |= (ZFS_ITER_DEPTH_LIMIT|ZFS_ITER_RECURSE);
470 	return (depth);
471 }
472 
473 /*
474  * zfs clone [-p] [-o prop=value] ... <snap> <fs | vol>
475  *
476  * Given an existing dataset, create a writable copy whose initial contents
477  * are the same as the source.  The newly created dataset maintains a
478  * dependency on the original; the original cannot be destroyed so long as
479  * the clone exists.
480  *
481  * The '-p' flag creates all the non-existing ancestors of the target first.
482  */
483 static int
484 zfs_do_clone(int argc, char **argv)
485 {
486 	zfs_handle_t *zhp = NULL;
487 	boolean_t parents = B_FALSE;
488 	nvlist_t *props;
489 	int ret;
490 	int c;
491 
492 	if (nvlist_alloc(&props, NV_UNIQUE_NAME, 0) != 0) {
493 		(void) fprintf(stderr, gettext("internal error: "
494 		    "out of memory\n"));
495 		return (1);
496 	}
497 
498 	/* check options */
499 	while ((c = getopt(argc, argv, "o:p")) != -1) {
500 		switch (c) {
501 		case 'o':
502 			if (parseprop(props))
503 				return (1);
504 			break;
505 		case 'p':
506 			parents = B_TRUE;
507 			break;
508 		case '?':
509 			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
510 			    optopt);
511 			goto usage;
512 		}
513 	}
514 
515 	argc -= optind;
516 	argv += optind;
517 
518 	/* check number of arguments */
519 	if (argc < 1) {
520 		(void) fprintf(stderr, gettext("missing source dataset "
521 		    "argument\n"));
522 		goto usage;
523 	}
524 	if (argc < 2) {
525 		(void) fprintf(stderr, gettext("missing target dataset "
526 		    "argument\n"));
527 		goto usage;
528 	}
529 	if (argc > 2) {
530 		(void) fprintf(stderr, gettext("too many arguments\n"));
531 		goto usage;
532 	}
533 
534 	/* open the source dataset */
535 	if ((zhp = zfs_open(g_zfs, argv[0], ZFS_TYPE_SNAPSHOT)) == NULL)
536 		return (1);
537 
538 	if (parents && zfs_name_valid(argv[1], ZFS_TYPE_FILESYSTEM |
539 	    ZFS_TYPE_VOLUME)) {
540 		/*
541 		 * Now create the ancestors of the target dataset.  If the
542 		 * target already exists and '-p' option was used we should not
543 		 * complain.
544 		 */
545 		if (zfs_dataset_exists(g_zfs, argv[1], ZFS_TYPE_FILESYSTEM |
546 		    ZFS_TYPE_VOLUME))
547 			return (0);
548 		if (zfs_create_ancestors(g_zfs, argv[1]) != 0)
549 			return (1);
550 	}
551 
552 	/* pass to libzfs */
553 	ret = zfs_clone(zhp, argv[1], props);
554 
555 	/* create the mountpoint if necessary */
556 	if (ret == 0) {
557 		zfs_handle_t *clone;
558 
559 		clone = zfs_open(g_zfs, argv[1], ZFS_TYPE_DATASET);
560 		if (clone != NULL) {
561 			if ((ret = zfs_mount(clone, NULL, 0)) == 0)
562 				ret = zfs_share(clone);
563 			zfs_close(clone);
564 		}
565 	}
566 
567 	zfs_close(zhp);
568 	nvlist_free(props);
569 
570 	return (!!ret);
571 
572 usage:
573 	if (zhp)
574 		zfs_close(zhp);
575 	nvlist_free(props);
576 	usage(B_FALSE);
577 	return (-1);
578 }
579 
580 /*
581  * zfs create [-p] [-o prop=value] ... fs
582  * zfs create [-ps] [-b blocksize] [-o prop=value] ... -V vol size
583  *
584  * Create a new dataset.  This command can be used to create filesystems
585  * and volumes.  Snapshot creation is handled by 'zfs snapshot'.
586  * For volumes, the user must specify a size to be used.
587  *
588  * The '-s' flag applies only to volumes, and indicates that we should not try
589  * to set the reservation for this volume.  By default we set a reservation
590  * equal to the size for any volume.  For pools with SPA_VERSION >=
591  * SPA_VERSION_REFRESERVATION, we set a refreservation instead.
592  *
593  * The '-p' flag creates all the non-existing ancestors of the target first.
594  */
595 static int
596 zfs_do_create(int argc, char **argv)
597 {
598 	zfs_type_t type = ZFS_TYPE_FILESYSTEM;
599 	zfs_handle_t *zhp = NULL;
600 	uint64_t volsize;
601 	int c;
602 	boolean_t noreserve = B_FALSE;
603 	boolean_t bflag = B_FALSE;
604 	boolean_t parents = B_FALSE;
605 	int ret = 1;
606 	nvlist_t *props;
607 	uint64_t intval;
608 	int canmount;
609 
610 	if (nvlist_alloc(&props, NV_UNIQUE_NAME, 0) != 0) {
611 		(void) fprintf(stderr, gettext("internal error: "
612 		    "out of memory\n"));
613 		return (1);
614 	}
615 
616 	/* check options */
617 	while ((c = getopt(argc, argv, ":V:b:so:p")) != -1) {
618 		switch (c) {
619 		case 'V':
620 			type = ZFS_TYPE_VOLUME;
621 			if (zfs_nicestrtonum(g_zfs, optarg, &intval) != 0) {
622 				(void) fprintf(stderr, gettext("bad volume "
623 				    "size '%s': %s\n"), optarg,
624 				    libzfs_error_description(g_zfs));
625 				goto error;
626 			}
627 
628 			if (nvlist_add_uint64(props,
629 			    zfs_prop_to_name(ZFS_PROP_VOLSIZE),
630 			    intval) != 0) {
631 				(void) fprintf(stderr, gettext("internal "
632 				    "error: out of memory\n"));
633 				goto error;
634 			}
635 			volsize = intval;
636 			break;
637 		case 'p':
638 			parents = B_TRUE;
639 			break;
640 		case 'b':
641 			bflag = B_TRUE;
642 			if (zfs_nicestrtonum(g_zfs, optarg, &intval) != 0) {
643 				(void) fprintf(stderr, gettext("bad volume "
644 				    "block size '%s': %s\n"), optarg,
645 				    libzfs_error_description(g_zfs));
646 				goto error;
647 			}
648 
649 			if (nvlist_add_uint64(props,
650 			    zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE),
651 			    intval) != 0) {
652 				(void) fprintf(stderr, gettext("internal "
653 				    "error: out of memory\n"));
654 				goto error;
655 			}
656 			break;
657 		case 'o':
658 			if (parseprop(props))
659 				goto error;
660 			break;
661 		case 's':
662 			noreserve = B_TRUE;
663 			break;
664 		case ':':
665 			(void) fprintf(stderr, gettext("missing size "
666 			    "argument\n"));
667 			goto badusage;
668 			break;
669 		case '?':
670 			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
671 			    optopt);
672 			goto badusage;
673 		}
674 	}
675 
676 	if ((bflag || noreserve) && type != ZFS_TYPE_VOLUME) {
677 		(void) fprintf(stderr, gettext("'-s' and '-b' can only be "
678 		    "used when creating a volume\n"));
679 		goto badusage;
680 	}
681 
682 	argc -= optind;
683 	argv += optind;
684 
685 	/* check number of arguments */
686 	if (argc == 0) {
687 		(void) fprintf(stderr, gettext("missing %s argument\n"),
688 		    zfs_type_to_name(type));
689 		goto badusage;
690 	}
691 	if (argc > 1) {
692 		(void) fprintf(stderr, gettext("too many arguments\n"));
693 		goto badusage;
694 	}
695 
696 	if (type == ZFS_TYPE_VOLUME && !noreserve) {
697 		zpool_handle_t *zpool_handle;
698 		uint64_t spa_version;
699 		char *p;
700 		zfs_prop_t resv_prop;
701 		char *strval;
702 
703 		if (p = strchr(argv[0], '/'))
704 			*p = '\0';
705 		zpool_handle = zpool_open(g_zfs, argv[0]);
706 		if (p != NULL)
707 			*p = '/';
708 		if (zpool_handle == NULL)
709 			goto error;
710 		spa_version = zpool_get_prop_int(zpool_handle,
711 		    ZPOOL_PROP_VERSION, NULL);
712 		zpool_close(zpool_handle);
713 		if (spa_version >= SPA_VERSION_REFRESERVATION)
714 			resv_prop = ZFS_PROP_REFRESERVATION;
715 		else
716 			resv_prop = ZFS_PROP_RESERVATION;
717 
718 		if (nvlist_lookup_string(props, zfs_prop_to_name(resv_prop),
719 		    &strval) != 0) {
720 			if (nvlist_add_uint64(props,
721 			    zfs_prop_to_name(resv_prop), volsize) != 0) {
722 				(void) fprintf(stderr, gettext("internal "
723 				    "error: out of memory\n"));
724 				nvlist_free(props);
725 				return (1);
726 			}
727 		}
728 	}
729 
730 	if (parents && zfs_name_valid(argv[0], type)) {
731 		/*
732 		 * Now create the ancestors of target dataset.  If the target
733 		 * already exists and '-p' option was used we should not
734 		 * complain.
735 		 */
736 		if (zfs_dataset_exists(g_zfs, argv[0], type)) {
737 			ret = 0;
738 			goto error;
739 		}
740 		if (zfs_create_ancestors(g_zfs, argv[0]) != 0)
741 			goto error;
742 	}
743 
744 	/* pass to libzfs */
745 	if (zfs_create(g_zfs, argv[0], type, props) != 0)
746 		goto error;
747 
748 	if ((zhp = zfs_open(g_zfs, argv[0], ZFS_TYPE_DATASET)) == NULL)
749 		goto error;
750 	/*
751 	 * if the user doesn't want the dataset automatically mounted,
752 	 * then skip the mount/share step
753 	 */
754 
755 	canmount = zfs_prop_get_int(zhp, ZFS_PROP_CANMOUNT);
756 
757 	/*
758 	 * Mount and/or share the new filesystem as appropriate.  We provide a
759 	 * verbose error message to let the user know that their filesystem was
760 	 * in fact created, even if we failed to mount or share it.
761 	 */
762 	ret = 0;
763 	if (canmount == ZFS_CANMOUNT_ON) {
764 		if (zfs_mount(zhp, NULL, 0) != 0) {
765 			(void) fprintf(stderr, gettext("filesystem "
766 			    "successfully created, but not mounted\n"));
767 			ret = 1;
768 		} else if (zfs_share(zhp) != 0) {
769 			(void) fprintf(stderr, gettext("filesystem "
770 			    "successfully created, but not shared\n"));
771 			ret = 1;
772 		}
773 	}
774 
775 error:
776 	if (zhp)
777 		zfs_close(zhp);
778 	nvlist_free(props);
779 	return (ret);
780 badusage:
781 	nvlist_free(props);
782 	usage(B_FALSE);
783 	return (2);
784 }
785 
786 /*
787  * zfs destroy [-rRf] <fs, vol>
788  * zfs destroy [-rRd] <snap>
789  *
790  * 	-r	Recursively destroy all children
791  * 	-R	Recursively destroy all dependents, including clones
792  * 	-f	Force unmounting of any dependents
793  *	-d	If we can't destroy now, mark for deferred destruction
794  *
795  * Destroys the given dataset.  By default, it will unmount any filesystems,
796  * and refuse to destroy a dataset that has any dependents.  A dependent can
797  * either be a child, or a clone of a child.
798  */
799 typedef struct destroy_cbdata {
800 	boolean_t	cb_first;
801 	int		cb_force;
802 	int		cb_recurse;
803 	int		cb_error;
804 	int		cb_needforce;
805 	int		cb_doclones;
806 	boolean_t	cb_closezhp;
807 	zfs_handle_t	*cb_target;
808 	char		*cb_snapname;
809 	boolean_t	cb_defer_destroy;
810 } destroy_cbdata_t;
811 
812 /*
813  * Check for any dependents based on the '-r' or '-R' flags.
814  */
815 static int
816 destroy_check_dependent(zfs_handle_t *zhp, void *data)
817 {
818 	destroy_cbdata_t *cbp = data;
819 	const char *tname = zfs_get_name(cbp->cb_target);
820 	const char *name = zfs_get_name(zhp);
821 
822 	if (strncmp(tname, name, strlen(tname)) == 0 &&
823 	    (name[strlen(tname)] == '/' || name[strlen(tname)] == '@')) {
824 		/*
825 		 * This is a direct descendant, not a clone somewhere else in
826 		 * the hierarchy.
827 		 */
828 		if (cbp->cb_recurse)
829 			goto out;
830 
831 		if (cbp->cb_first) {
832 			(void) fprintf(stderr, gettext("cannot destroy '%s': "
833 			    "%s has children\n"),
834 			    zfs_get_name(cbp->cb_target),
835 			    zfs_type_to_name(zfs_get_type(cbp->cb_target)));
836 			(void) fprintf(stderr, gettext("use '-r' to destroy "
837 			    "the following datasets:\n"));
838 			cbp->cb_first = B_FALSE;
839 			cbp->cb_error = 1;
840 		}
841 
842 		(void) fprintf(stderr, "%s\n", zfs_get_name(zhp));
843 	} else {
844 		/*
845 		 * This is a clone.  We only want to report this if the '-r'
846 		 * wasn't specified, or the target is a snapshot.
847 		 */
848 		if (!cbp->cb_recurse &&
849 		    zfs_get_type(cbp->cb_target) != ZFS_TYPE_SNAPSHOT)
850 			goto out;
851 
852 		if (cbp->cb_first) {
853 			(void) fprintf(stderr, gettext("cannot destroy '%s': "
854 			    "%s has dependent clones\n"),
855 			    zfs_get_name(cbp->cb_target),
856 			    zfs_type_to_name(zfs_get_type(cbp->cb_target)));
857 			(void) fprintf(stderr, gettext("use '-R' to destroy "
858 			    "the following datasets:\n"));
859 			cbp->cb_first = B_FALSE;
860 			cbp->cb_error = 1;
861 		}
862 
863 		(void) fprintf(stderr, "%s\n", zfs_get_name(zhp));
864 	}
865 
866 out:
867 	zfs_close(zhp);
868 	return (0);
869 }
870 
871 static int
872 destroy_callback(zfs_handle_t *zhp, void *data)
873 {
874 	destroy_cbdata_t *cbp = data;
875 
876 	/*
877 	 * Ignore pools (which we've already flagged as an error before getting
878 	 * here).
879 	 */
880 	if (strchr(zfs_get_name(zhp), '/') == NULL &&
881 	    zfs_get_type(zhp) == ZFS_TYPE_FILESYSTEM) {
882 		zfs_close(zhp);
883 		return (0);
884 	}
885 
886 	/*
887 	 * Bail out on the first error.
888 	 */
889 	if (zfs_unmount(zhp, NULL, cbp->cb_force ? MS_FORCE : 0) != 0 ||
890 	    zfs_destroy(zhp, cbp->cb_defer_destroy) != 0) {
891 		zfs_close(zhp);
892 		return (-1);
893 	}
894 
895 	zfs_close(zhp);
896 	return (0);
897 }
898 
899 static int
900 destroy_snap_clones(zfs_handle_t *zhp, void *arg)
901 {
902 	destroy_cbdata_t *cbp = arg;
903 	char thissnap[MAXPATHLEN];
904 	zfs_handle_t *szhp;
905 	boolean_t closezhp = cbp->cb_closezhp;
906 	int rv;
907 
908 	(void) snprintf(thissnap, sizeof (thissnap),
909 	    "%s@%s", zfs_get_name(zhp), cbp->cb_snapname);
910 
911 	libzfs_print_on_error(g_zfs, B_FALSE);
912 	szhp = zfs_open(g_zfs, thissnap, ZFS_TYPE_SNAPSHOT);
913 	libzfs_print_on_error(g_zfs, B_TRUE);
914 	if (szhp) {
915 		/*
916 		 * Destroy any clones of this snapshot
917 		 */
918 		if (zfs_iter_dependents(szhp, B_FALSE, destroy_callback,
919 		    cbp) != 0) {
920 			zfs_close(szhp);
921 			if (closezhp)
922 				zfs_close(zhp);
923 			return (-1);
924 		}
925 		zfs_close(szhp);
926 	}
927 
928 	cbp->cb_closezhp = B_TRUE;
929 	rv = zfs_iter_filesystems(zhp, destroy_snap_clones, arg);
930 	if (closezhp)
931 		zfs_close(zhp);
932 	return (rv);
933 }
934 
935 static int
936 zfs_do_destroy(int argc, char **argv)
937 {
938 	destroy_cbdata_t cb = { 0 };
939 	int c;
940 	zfs_handle_t *zhp;
941 	char *cp;
942 	zfs_type_t type = ZFS_TYPE_DATASET;
943 
944 	/* check options */
945 	while ((c = getopt(argc, argv, "dfrR")) != -1) {
946 		switch (c) {
947 		case 'd':
948 			cb.cb_defer_destroy = B_TRUE;
949 			type = ZFS_TYPE_SNAPSHOT;
950 			break;
951 		case 'f':
952 			cb.cb_force = 1;
953 			break;
954 		case 'r':
955 			cb.cb_recurse = 1;
956 			break;
957 		case 'R':
958 			cb.cb_recurse = 1;
959 			cb.cb_doclones = 1;
960 			break;
961 		case '?':
962 		default:
963 			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
964 			    optopt);
965 			usage(B_FALSE);
966 		}
967 	}
968 
969 	argc -= optind;
970 	argv += optind;
971 
972 	/* check number of arguments */
973 	if (argc == 0) {
974 		(void) fprintf(stderr, gettext("missing path argument\n"));
975 		usage(B_FALSE);
976 	}
977 	if (argc > 1) {
978 		(void) fprintf(stderr, gettext("too many arguments\n"));
979 		usage(B_FALSE);
980 	}
981 
982 	/*
983 	 * If we are doing recursive destroy of a snapshot, then the
984 	 * named snapshot may not exist.  Go straight to libzfs.
985 	 */
986 	if (cb.cb_recurse && (cp = strchr(argv[0], '@'))) {
987 		int ret;
988 
989 		*cp = '\0';
990 		if ((zhp = zfs_open(g_zfs, argv[0], ZFS_TYPE_DATASET)) == NULL)
991 			return (1);
992 		*cp = '@';
993 		cp++;
994 
995 		if (cb.cb_doclones) {
996 			boolean_t defer = cb.cb_defer_destroy;
997 
998 			/*
999 			 * Temporarily ignore the defer_destroy setting since
1000 			 * it's not supported for clones.
1001 			 */
1002 			cb.cb_defer_destroy = B_FALSE;
1003 			cb.cb_snapname = cp;
1004 			if (destroy_snap_clones(zhp, &cb) != 0) {
1005 				zfs_close(zhp);
1006 				return (1);
1007 			}
1008 			cb.cb_defer_destroy = defer;
1009 		}
1010 
1011 		ret = zfs_destroy_snaps(zhp, cp, cb.cb_defer_destroy);
1012 		zfs_close(zhp);
1013 		if (ret) {
1014 			(void) fprintf(stderr,
1015 			    gettext("no snapshots destroyed\n"));
1016 		}
1017 		return (ret != 0);
1018 	}
1019 
1020 	/* Open the given dataset */
1021 	if ((zhp = zfs_open(g_zfs, argv[0], type)) == NULL)
1022 		return (1);
1023 
1024 	cb.cb_target = zhp;
1025 
1026 	/*
1027 	 * Perform an explicit check for pools before going any further.
1028 	 */
1029 	if (!cb.cb_recurse && strchr(zfs_get_name(zhp), '/') == NULL &&
1030 	    zfs_get_type(zhp) == ZFS_TYPE_FILESYSTEM) {
1031 		(void) fprintf(stderr, gettext("cannot destroy '%s': "
1032 		    "operation does not apply to pools\n"),
1033 		    zfs_get_name(zhp));
1034 		(void) fprintf(stderr, gettext("use 'zfs destroy -r "
1035 		    "%s' to destroy all datasets in the pool\n"),
1036 		    zfs_get_name(zhp));
1037 		(void) fprintf(stderr, gettext("use 'zpool destroy %s' "
1038 		    "to destroy the pool itself\n"), zfs_get_name(zhp));
1039 		zfs_close(zhp);
1040 		return (1);
1041 	}
1042 
1043 	/*
1044 	 * Check for any dependents and/or clones.
1045 	 */
1046 	cb.cb_first = B_TRUE;
1047 	if (!cb.cb_doclones && !cb.cb_defer_destroy &&
1048 	    zfs_iter_dependents(zhp, B_TRUE, destroy_check_dependent,
1049 	    &cb) != 0) {
1050 		zfs_close(zhp);
1051 		return (1);
1052 	}
1053 
1054 	if (cb.cb_error || (!cb.cb_defer_destroy &&
1055 	    (zfs_iter_dependents(zhp, B_FALSE, destroy_callback, &cb) != 0))) {
1056 		zfs_close(zhp);
1057 		return (1);
1058 	}
1059 
1060 	/*
1061 	 * Do the real thing.  The callback will close the handle regardless of
1062 	 * whether it succeeds or not.
1063 	 */
1064 
1065 	if (destroy_callback(zhp, &cb) != 0)
1066 		return (1);
1067 
1068 	return (0);
1069 }
1070 
1071 /*
1072  * zfs get [-rHp] [-o field[,field]...] [-s source[,source]...]
1073  * 	< all | property[,property]... > < fs | snap | vol > ...
1074  *
1075  *	-r	recurse over any child datasets
1076  *	-H	scripted mode.  Headers are stripped, and fields are separated
1077  *		by tabs instead of spaces.
1078  *	-o	Set of fields to display.  One of "name,property,value,source".
1079  *		Default is all four.
1080  *	-s	Set of sources to allow.  One of
1081  *		"local,default,inherited,temporary,none".  Default is all
1082  *		five.
1083  *	-p	Display values in parsable (literal) format.
1084  *
1085  *  Prints properties for the given datasets.  The user can control which
1086  *  columns to display as well as which property types to allow.
1087  */
1088 
1089 /*
1090  * Invoked to display the properties for a single dataset.
1091  */
1092 static int
1093 get_callback(zfs_handle_t *zhp, void *data)
1094 {
1095 	char buf[ZFS_MAXPROPLEN];
1096 	zprop_source_t sourcetype;
1097 	char source[ZFS_MAXNAMELEN];
1098 	zprop_get_cbdata_t *cbp = data;
1099 	nvlist_t *userprop = zfs_get_user_props(zhp);
1100 	zprop_list_t *pl = cbp->cb_proplist;
1101 	nvlist_t *propval;
1102 	char *strval;
1103 	char *sourceval;
1104 
1105 	for (; pl != NULL; pl = pl->pl_next) {
1106 		/*
1107 		 * Skip the special fake placeholder.  This will also skip over
1108 		 * the name property when 'all' is specified.
1109 		 */
1110 		if (pl->pl_prop == ZFS_PROP_NAME &&
1111 		    pl == cbp->cb_proplist)
1112 			continue;
1113 
1114 		if (pl->pl_prop != ZPROP_INVAL) {
1115 			if (zfs_prop_get(zhp, pl->pl_prop, buf,
1116 			    sizeof (buf), &sourcetype, source,
1117 			    sizeof (source),
1118 			    cbp->cb_literal) != 0) {
1119 				if (pl->pl_all)
1120 					continue;
1121 				if (!zfs_prop_valid_for_type(pl->pl_prop,
1122 				    ZFS_TYPE_DATASET)) {
1123 					(void) fprintf(stderr,
1124 					    gettext("No such property '%s'\n"),
1125 					    zfs_prop_to_name(pl->pl_prop));
1126 					continue;
1127 				}
1128 				sourcetype = ZPROP_SRC_NONE;
1129 				(void) strlcpy(buf, "-", sizeof (buf));
1130 			}
1131 
1132 			zprop_print_one_property(zfs_get_name(zhp), cbp,
1133 			    zfs_prop_to_name(pl->pl_prop),
1134 			    buf, sourcetype, source);
1135 		} else if (zfs_prop_userquota(pl->pl_user_prop)) {
1136 			sourcetype = ZPROP_SRC_LOCAL;
1137 
1138 			if (zfs_prop_get_userquota(zhp, pl->pl_user_prop,
1139 			    buf, sizeof (buf), cbp->cb_literal) != 0) {
1140 				sourcetype = ZPROP_SRC_NONE;
1141 				(void) strlcpy(buf, "-", sizeof (buf));
1142 			}
1143 
1144 			zprop_print_one_property(zfs_get_name(zhp), cbp,
1145 			    pl->pl_user_prop, buf, sourcetype, source);
1146 		} else {
1147 			if (nvlist_lookup_nvlist(userprop,
1148 			    pl->pl_user_prop, &propval) != 0) {
1149 				if (pl->pl_all)
1150 					continue;
1151 				sourcetype = ZPROP_SRC_NONE;
1152 				strval = "-";
1153 			} else {
1154 				verify(nvlist_lookup_string(propval,
1155 				    ZPROP_VALUE, &strval) == 0);
1156 				verify(nvlist_lookup_string(propval,
1157 				    ZPROP_SOURCE, &sourceval) == 0);
1158 
1159 				if (strcmp(sourceval,
1160 				    zfs_get_name(zhp)) == 0) {
1161 					sourcetype = ZPROP_SRC_LOCAL;
1162 				} else {
1163 					sourcetype = ZPROP_SRC_INHERITED;
1164 					(void) strlcpy(source,
1165 					    sourceval, sizeof (source));
1166 				}
1167 			}
1168 
1169 			zprop_print_one_property(zfs_get_name(zhp), cbp,
1170 			    pl->pl_user_prop, strval, sourcetype,
1171 			    source);
1172 		}
1173 	}
1174 
1175 	return (0);
1176 }
1177 
1178 static int
1179 zfs_do_get(int argc, char **argv)
1180 {
1181 	zprop_get_cbdata_t cb = { 0 };
1182 	int i, c, flags = 0;
1183 	char *value, *fields;
1184 	int ret;
1185 	int limit = 0;
1186 	zprop_list_t fake_name = { 0 };
1187 
1188 	/*
1189 	 * Set up default columns and sources.
1190 	 */
1191 	cb.cb_sources = ZPROP_SRC_ALL;
1192 	cb.cb_columns[0] = GET_COL_NAME;
1193 	cb.cb_columns[1] = GET_COL_PROPERTY;
1194 	cb.cb_columns[2] = GET_COL_VALUE;
1195 	cb.cb_columns[3] = GET_COL_SOURCE;
1196 	cb.cb_type = ZFS_TYPE_DATASET;
1197 
1198 	/* check options */
1199 	while ((c = getopt(argc, argv, ":d:o:s:rHp")) != -1) {
1200 		switch (c) {
1201 		case 'p':
1202 			cb.cb_literal = B_TRUE;
1203 			break;
1204 		case 'd':
1205 			limit = parse_depth(optarg, &flags);
1206 			break;
1207 		case 'r':
1208 			flags |= ZFS_ITER_RECURSE;
1209 			break;
1210 		case 'H':
1211 			cb.cb_scripted = B_TRUE;
1212 			break;
1213 		case ':':
1214 			(void) fprintf(stderr, gettext("missing argument for "
1215 			    "'%c' option\n"), optopt);
1216 			usage(B_FALSE);
1217 			break;
1218 		case 'o':
1219 			/*
1220 			 * Process the set of columns to display.  We zero out
1221 			 * the structure to give us a blank slate.
1222 			 */
1223 			bzero(&cb.cb_columns, sizeof (cb.cb_columns));
1224 			i = 0;
1225 			while (*optarg != '\0') {
1226 				static char *col_subopts[] =
1227 				    { "name", "property", "value", "source",
1228 				    NULL };
1229 
1230 				if (i == 4) {
1231 					(void) fprintf(stderr, gettext("too "
1232 					    "many fields given to -o "
1233 					    "option\n"));
1234 					usage(B_FALSE);
1235 				}
1236 
1237 				switch (getsubopt(&optarg, col_subopts,
1238 				    &value)) {
1239 				case 0:
1240 					cb.cb_columns[i++] = GET_COL_NAME;
1241 					break;
1242 				case 1:
1243 					cb.cb_columns[i++] = GET_COL_PROPERTY;
1244 					break;
1245 				case 2:
1246 					cb.cb_columns[i++] = GET_COL_VALUE;
1247 					break;
1248 				case 3:
1249 					cb.cb_columns[i++] = GET_COL_SOURCE;
1250 					break;
1251 				default:
1252 					(void) fprintf(stderr,
1253 					    gettext("invalid column name "
1254 					    "'%s'\n"), value);
1255 					usage(B_FALSE);
1256 				}
1257 			}
1258 			break;
1259 
1260 		case 's':
1261 			cb.cb_sources = 0;
1262 			while (*optarg != '\0') {
1263 				static char *source_subopts[] = {
1264 					"local", "default", "inherited",
1265 					"temporary", "none", NULL };
1266 
1267 				switch (getsubopt(&optarg, source_subopts,
1268 				    &value)) {
1269 				case 0:
1270 					cb.cb_sources |= ZPROP_SRC_LOCAL;
1271 					break;
1272 				case 1:
1273 					cb.cb_sources |= ZPROP_SRC_DEFAULT;
1274 					break;
1275 				case 2:
1276 					cb.cb_sources |= ZPROP_SRC_INHERITED;
1277 					break;
1278 				case 3:
1279 					cb.cb_sources |= ZPROP_SRC_TEMPORARY;
1280 					break;
1281 				case 4:
1282 					cb.cb_sources |= ZPROP_SRC_NONE;
1283 					break;
1284 				default:
1285 					(void) fprintf(stderr,
1286 					    gettext("invalid source "
1287 					    "'%s'\n"), value);
1288 					usage(B_FALSE);
1289 				}
1290 			}
1291 			break;
1292 
1293 		case '?':
1294 			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
1295 			    optopt);
1296 			usage(B_FALSE);
1297 		}
1298 	}
1299 
1300 	argc -= optind;
1301 	argv += optind;
1302 
1303 	if (argc < 1) {
1304 		(void) fprintf(stderr, gettext("missing property "
1305 		    "argument\n"));
1306 		usage(B_FALSE);
1307 	}
1308 
1309 	fields = argv[0];
1310 
1311 	if (zprop_get_list(g_zfs, fields, &cb.cb_proplist, ZFS_TYPE_DATASET)
1312 	    != 0)
1313 		usage(B_FALSE);
1314 
1315 	argc--;
1316 	argv++;
1317 
1318 	/*
1319 	 * As part of zfs_expand_proplist(), we keep track of the maximum column
1320 	 * width for each property.  For the 'NAME' (and 'SOURCE') columns, we
1321 	 * need to know the maximum name length.  However, the user likely did
1322 	 * not specify 'name' as one of the properties to fetch, so we need to
1323 	 * make sure we always include at least this property for
1324 	 * print_get_headers() to work properly.
1325 	 */
1326 	if (cb.cb_proplist != NULL) {
1327 		fake_name.pl_prop = ZFS_PROP_NAME;
1328 		fake_name.pl_width = strlen(gettext("NAME"));
1329 		fake_name.pl_next = cb.cb_proplist;
1330 		cb.cb_proplist = &fake_name;
1331 	}
1332 
1333 	cb.cb_first = B_TRUE;
1334 
1335 	/* run for each object */
1336 	ret = zfs_for_each(argc, argv, flags, ZFS_TYPE_DATASET, NULL,
1337 	    &cb.cb_proplist, limit, get_callback, &cb);
1338 
1339 	if (cb.cb_proplist == &fake_name)
1340 		zprop_free_list(fake_name.pl_next);
1341 	else
1342 		zprop_free_list(cb.cb_proplist);
1343 
1344 	return (ret);
1345 }
1346 
1347 /*
1348  * inherit [-r] <property> <fs|vol> ...
1349  *
1350  * 	-r	Recurse over all children
1351  *
1352  * For each dataset specified on the command line, inherit the given property
1353  * from its parent.  Inheriting a property at the pool level will cause it to
1354  * use the default value.  The '-r' flag will recurse over all children, and is
1355  * useful for setting a property on a hierarchy-wide basis, regardless of any
1356  * local modifications for each dataset.
1357  */
1358 
1359 static int
1360 inherit_recurse_cb(zfs_handle_t *zhp, void *data)
1361 {
1362 	char *propname = data;
1363 	zfs_prop_t prop = zfs_name_to_prop(propname);
1364 
1365 	/*
1366 	 * If we're doing it recursively, then ignore properties that
1367 	 * are not valid for this type of dataset.
1368 	 */
1369 	if (prop != ZPROP_INVAL &&
1370 	    !zfs_prop_valid_for_type(prop, zfs_get_type(zhp)))
1371 		return (0);
1372 
1373 	return (zfs_prop_inherit(zhp, propname) != 0);
1374 }
1375 
1376 static int
1377 inherit_cb(zfs_handle_t *zhp, void *data)
1378 {
1379 	char *propname = data;
1380 
1381 	return (zfs_prop_inherit(zhp, propname) != 0);
1382 }
1383 
1384 static int
1385 zfs_do_inherit(int argc, char **argv)
1386 {
1387 	int c;
1388 	zfs_prop_t prop;
1389 	char *propname;
1390 	int ret;
1391 	int flags = 0;
1392 
1393 	/* check options */
1394 	while ((c = getopt(argc, argv, "r")) != -1) {
1395 		switch (c) {
1396 		case 'r':
1397 			flags |= ZFS_ITER_RECURSE;
1398 			break;
1399 		case '?':
1400 		default:
1401 			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
1402 			    optopt);
1403 			usage(B_FALSE);
1404 		}
1405 	}
1406 
1407 	argc -= optind;
1408 	argv += optind;
1409 
1410 	/* check number of arguments */
1411 	if (argc < 1) {
1412 		(void) fprintf(stderr, gettext("missing property argument\n"));
1413 		usage(B_FALSE);
1414 	}
1415 	if (argc < 2) {
1416 		(void) fprintf(stderr, gettext("missing dataset argument\n"));
1417 		usage(B_FALSE);
1418 	}
1419 
1420 	propname = argv[0];
1421 	argc--;
1422 	argv++;
1423 
1424 	if ((prop = zfs_name_to_prop(propname)) != ZPROP_INVAL) {
1425 		if (zfs_prop_readonly(prop)) {
1426 			(void) fprintf(stderr, gettext(
1427 			    "%s property is read-only\n"),
1428 			    propname);
1429 			return (1);
1430 		}
1431 		if (!zfs_prop_inheritable(prop)) {
1432 			(void) fprintf(stderr, gettext("'%s' property cannot "
1433 			    "be inherited\n"), propname);
1434 			if (prop == ZFS_PROP_QUOTA ||
1435 			    prop == ZFS_PROP_RESERVATION ||
1436 			    prop == ZFS_PROP_REFQUOTA ||
1437 			    prop == ZFS_PROP_REFRESERVATION)
1438 				(void) fprintf(stderr, gettext("use 'zfs set "
1439 				    "%s=none' to clear\n"), propname);
1440 			return (1);
1441 		}
1442 	} else if (!zfs_prop_user(propname)) {
1443 		(void) fprintf(stderr, gettext("invalid property '%s'\n"),
1444 		    propname);
1445 		usage(B_FALSE);
1446 	}
1447 
1448 	if (flags & ZFS_ITER_RECURSE) {
1449 		ret = zfs_for_each(argc, argv, flags, ZFS_TYPE_DATASET,
1450 		    NULL, NULL, 0, inherit_recurse_cb, propname);
1451 	} else {
1452 		ret = zfs_for_each(argc, argv, flags, ZFS_TYPE_DATASET,
1453 		    NULL, NULL, 0, inherit_cb, propname);
1454 	}
1455 
1456 	return (ret);
1457 }
1458 
1459 typedef struct upgrade_cbdata {
1460 	uint64_t cb_numupgraded;
1461 	uint64_t cb_numsamegraded;
1462 	uint64_t cb_numfailed;
1463 	uint64_t cb_version;
1464 	boolean_t cb_newer;
1465 	boolean_t cb_foundone;
1466 	char cb_lastfs[ZFS_MAXNAMELEN];
1467 } upgrade_cbdata_t;
1468 
1469 static int
1470 same_pool(zfs_handle_t *zhp, const char *name)
1471 {
1472 	int len1 = strcspn(name, "/@");
1473 	const char *zhname = zfs_get_name(zhp);
1474 	int len2 = strcspn(zhname, "/@");
1475 
1476 	if (len1 != len2)
1477 		return (B_FALSE);
1478 	return (strncmp(name, zhname, len1) == 0);
1479 }
1480 
1481 static int
1482 upgrade_list_callback(zfs_handle_t *zhp, void *data)
1483 {
1484 	upgrade_cbdata_t *cb = data;
1485 	int version = zfs_prop_get_int(zhp, ZFS_PROP_VERSION);
1486 
1487 	/* list if it's old/new */
1488 	if ((!cb->cb_newer && version < ZPL_VERSION) ||
1489 	    (cb->cb_newer && version > ZPL_VERSION)) {
1490 		char *str;
1491 		if (cb->cb_newer) {
1492 			str = gettext("The following filesystems are "
1493 			    "formatted using a newer software version and\n"
1494 			    "cannot be accessed on the current system.\n\n");
1495 		} else {
1496 			str = gettext("The following filesystems are "
1497 			    "out of date, and can be upgraded.  After being\n"
1498 			    "upgraded, these filesystems (and any 'zfs send' "
1499 			    "streams generated from\n"
1500 			    "subsequent snapshots) will no longer be "
1501 			    "accessible by older software versions.\n\n");
1502 		}
1503 
1504 		if (!cb->cb_foundone) {
1505 			(void) puts(str);
1506 			(void) printf(gettext("VER  FILESYSTEM\n"));
1507 			(void) printf(gettext("---  ------------\n"));
1508 			cb->cb_foundone = B_TRUE;
1509 		}
1510 
1511 		(void) printf("%2u   %s\n", version, zfs_get_name(zhp));
1512 	}
1513 
1514 	return (0);
1515 }
1516 
1517 static int
1518 upgrade_set_callback(zfs_handle_t *zhp, void *data)
1519 {
1520 	upgrade_cbdata_t *cb = data;
1521 	int version = zfs_prop_get_int(zhp, ZFS_PROP_VERSION);
1522 	int i;
1523 	static struct { int zplver; int spaver; } table[] = {
1524 		{ZPL_VERSION_FUID, SPA_VERSION_FUID},
1525 		{ZPL_VERSION_USERSPACE, SPA_VERSION_USERSPACE},
1526 		{0, 0}
1527 	};
1528 
1529 
1530 	for (i = 0; table[i].zplver; i++) {
1531 		if (cb->cb_version >= table[i].zplver) {
1532 			int spa_version;
1533 
1534 			if (zfs_spa_version(zhp, &spa_version) < 0)
1535 				return (-1);
1536 
1537 			if (spa_version < table[i].spaver) {
1538 				/* can't upgrade */
1539 				(void) printf(gettext("%s: can not be "
1540 				    "upgraded; the pool version needs to first "
1541 				    "be upgraded\nto version %d\n\n"),
1542 				    zfs_get_name(zhp), table[i].spaver);
1543 				cb->cb_numfailed++;
1544 				return (0);
1545 			}
1546 		}
1547 	}
1548 
1549 	/* upgrade */
1550 	if (version < cb->cb_version) {
1551 		char verstr[16];
1552 		(void) snprintf(verstr, sizeof (verstr),
1553 		    "%llu", cb->cb_version);
1554 		if (cb->cb_lastfs[0] && !same_pool(zhp, cb->cb_lastfs)) {
1555 			/*
1556 			 * If they did "zfs upgrade -a", then we could
1557 			 * be doing ioctls to different pools.  We need
1558 			 * to log this history once to each pool.
1559 			 */
1560 			verify(zpool_stage_history(g_zfs, history_str) == 0);
1561 		}
1562 		if (zfs_prop_set(zhp, "version", verstr) == 0)
1563 			cb->cb_numupgraded++;
1564 		else
1565 			cb->cb_numfailed++;
1566 		(void) strcpy(cb->cb_lastfs, zfs_get_name(zhp));
1567 	} else if (version > cb->cb_version) {
1568 		/* can't downgrade */
1569 		(void) printf(gettext("%s: can not be downgraded; "
1570 		    "it is already at version %u\n"),
1571 		    zfs_get_name(zhp), version);
1572 		cb->cb_numfailed++;
1573 	} else {
1574 		cb->cb_numsamegraded++;
1575 	}
1576 	return (0);
1577 }
1578 
1579 /*
1580  * zfs upgrade
1581  * zfs upgrade -v
1582  * zfs upgrade [-r] [-V <version>] <-a | filesystem>
1583  */
1584 static int
1585 zfs_do_upgrade(int argc, char **argv)
1586 {
1587 	boolean_t all = B_FALSE;
1588 	boolean_t showversions = B_FALSE;
1589 	int ret;
1590 	upgrade_cbdata_t cb = { 0 };
1591 	char c;
1592 	int flags = ZFS_ITER_ARGS_CAN_BE_PATHS;
1593 
1594 	/* check options */
1595 	while ((c = getopt(argc, argv, "rvV:a")) != -1) {
1596 		switch (c) {
1597 		case 'r':
1598 			flags |= ZFS_ITER_RECURSE;
1599 			break;
1600 		case 'v':
1601 			showversions = B_TRUE;
1602 			break;
1603 		case 'V':
1604 			if (zfs_prop_string_to_index(ZFS_PROP_VERSION,
1605 			    optarg, &cb.cb_version) != 0) {
1606 				(void) fprintf(stderr,
1607 				    gettext("invalid version %s\n"), optarg);
1608 				usage(B_FALSE);
1609 			}
1610 			break;
1611 		case 'a':
1612 			all = B_TRUE;
1613 			break;
1614 		case '?':
1615 		default:
1616 			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
1617 			    optopt);
1618 			usage(B_FALSE);
1619 		}
1620 	}
1621 
1622 	argc -= optind;
1623 	argv += optind;
1624 
1625 	if ((!all && !argc) && ((flags & ZFS_ITER_RECURSE) | cb.cb_version))
1626 		usage(B_FALSE);
1627 	if (showversions && (flags & ZFS_ITER_RECURSE || all ||
1628 	    cb.cb_version || argc))
1629 		usage(B_FALSE);
1630 	if ((all || argc) && (showversions))
1631 		usage(B_FALSE);
1632 	if (all && argc)
1633 		usage(B_FALSE);
1634 
1635 	if (showversions) {
1636 		/* Show info on available versions. */
1637 		(void) printf(gettext("The following filesystem versions are "
1638 		    "supported:\n\n"));
1639 		(void) printf(gettext("VER  DESCRIPTION\n"));
1640 		(void) printf("---  -----------------------------------------"
1641 		    "---------------\n");
1642 		(void) printf(gettext(" 1   Initial ZFS filesystem version\n"));
1643 		(void) printf(gettext(" 2   Enhanced directory entries\n"));
1644 		(void) printf(gettext(" 3   Case insensitive and File system "
1645 		    "unique identifier (FUID)\n"));
1646 		(void) printf(gettext(" 4   userquota, groupquota "
1647 		    "properties\n"));
1648 		(void) printf(gettext("\nFor more information on a particular "
1649 		    "version, including supported releases, see:\n\n"));
1650 		(void) printf("http://www.opensolaris.org/os/community/zfs/"
1651 		    "version/zpl/N\n\n");
1652 		(void) printf(gettext("Where 'N' is the version number.\n"));
1653 		ret = 0;
1654 	} else if (argc || all) {
1655 		/* Upgrade filesystems */
1656 		if (cb.cb_version == 0)
1657 			cb.cb_version = ZPL_VERSION;
1658 		ret = zfs_for_each(argc, argv, flags, ZFS_TYPE_FILESYSTEM,
1659 		    NULL, NULL, 0, upgrade_set_callback, &cb);
1660 		(void) printf(gettext("%llu filesystems upgraded\n"),
1661 		    cb.cb_numupgraded);
1662 		if (cb.cb_numsamegraded) {
1663 			(void) printf(gettext("%llu filesystems already at "
1664 			    "this version\n"),
1665 			    cb.cb_numsamegraded);
1666 		}
1667 		if (cb.cb_numfailed != 0)
1668 			ret = 1;
1669 	} else {
1670 		/* List old-version filesytems */
1671 		boolean_t found;
1672 		(void) printf(gettext("This system is currently running "
1673 		    "ZFS filesystem version %llu.\n\n"), ZPL_VERSION);
1674 
1675 		flags |= ZFS_ITER_RECURSE;
1676 		ret = zfs_for_each(0, NULL, flags, ZFS_TYPE_FILESYSTEM,
1677 		    NULL, NULL, 0, upgrade_list_callback, &cb);
1678 
1679 		found = cb.cb_foundone;
1680 		cb.cb_foundone = B_FALSE;
1681 		cb.cb_newer = B_TRUE;
1682 
1683 		ret = zfs_for_each(0, NULL, flags, ZFS_TYPE_FILESYSTEM,
1684 		    NULL, NULL, 0, upgrade_list_callback, &cb);
1685 
1686 		if (!cb.cb_foundone && !found) {
1687 			(void) printf(gettext("All filesystems are "
1688 			    "formatted with the current version.\n"));
1689 		}
1690 	}
1691 
1692 	return (ret);
1693 }
1694 
1695 /*
1696  * zfs userspace
1697  */
1698 static int
1699 userspace_cb(void *arg, const char *domain, uid_t rid, uint64_t space)
1700 {
1701 	zfs_userquota_prop_t *typep = arg;
1702 	zfs_userquota_prop_t p = *typep;
1703 	char *name = NULL;
1704 	char *ug, *propname;
1705 	char namebuf[32];
1706 	char sizebuf[32];
1707 
1708 	if (domain == NULL || domain[0] == '\0') {
1709 		if (p == ZFS_PROP_GROUPUSED || p == ZFS_PROP_GROUPQUOTA) {
1710 			struct group *g = getgrgid(rid);
1711 			if (g)
1712 				name = g->gr_name;
1713 		} else {
1714 			struct passwd *p = getpwuid(rid);
1715 			if (p)
1716 				name = p->pw_name;
1717 		}
1718 	}
1719 
1720 	if (p == ZFS_PROP_GROUPUSED || p == ZFS_PROP_GROUPQUOTA)
1721 		ug = "group";
1722 	else
1723 		ug = "user";
1724 
1725 	if (p == ZFS_PROP_USERUSED || p == ZFS_PROP_GROUPUSED)
1726 		propname = "used";
1727 	else
1728 		propname = "quota";
1729 
1730 	if (name == NULL) {
1731 		(void) snprintf(namebuf, sizeof (namebuf),
1732 		    "%llu", (longlong_t)rid);
1733 		name = namebuf;
1734 	}
1735 	zfs_nicenum(space, sizebuf, sizeof (sizebuf));
1736 
1737 	(void) printf("%s %s %s%c%s %s\n", propname, ug, domain,
1738 	    domain[0] ? '-' : ' ', name, sizebuf);
1739 
1740 	return (0);
1741 }
1742 
1743 static int
1744 zfs_do_userspace(int argc, char **argv)
1745 {
1746 	zfs_handle_t *zhp;
1747 	zfs_userquota_prop_t p;
1748 	int error;
1749 
1750 	/*
1751 	 * Try the python version.  If the execv fails, we'll continue
1752 	 * and do a simplistic implementation.
1753 	 */
1754 	(void) execv(pypath, argv-1);
1755 
1756 	(void) printf("internal error: %s not found\n"
1757 	    "falling back on built-in implementation, "
1758 	    "some features will not work\n", pypath);
1759 
1760 	if ((zhp = zfs_open(g_zfs, argv[argc-1], ZFS_TYPE_DATASET)) == NULL)
1761 		return (1);
1762 
1763 	(void) printf("PROP TYPE NAME VALUE\n");
1764 
1765 	for (p = 0; p < ZFS_NUM_USERQUOTA_PROPS; p++) {
1766 		error = zfs_userspace(zhp, p, userspace_cb, &p);
1767 		if (error)
1768 			break;
1769 	}
1770 	return (error);
1771 }
1772 
1773 /*
1774  * list [-r][-d max] [-H] [-o property[,property]...] [-t type[,type]...]
1775  *      [-s property [-s property]...] [-S property [-S property]...]
1776  *      <dataset> ...
1777  *
1778  * 	-r	Recurse over all children
1779  * 	-d	Limit recursion by depth.
1780  * 	-H	Scripted mode; elide headers and separate columns by tabs
1781  * 	-o	Control which fields to display.
1782  * 	-t	Control which object types to display.
1783  *	-s	Specify sort columns, descending order.
1784  *	-S	Specify sort columns, ascending order.
1785  *
1786  * When given no arguments, lists all filesystems in the system.
1787  * Otherwise, list the specified datasets, optionally recursing down them if
1788  * '-r' is specified.
1789  */
1790 typedef struct list_cbdata {
1791 	boolean_t	cb_first;
1792 	boolean_t	cb_scripted;
1793 	zprop_list_t	*cb_proplist;
1794 } list_cbdata_t;
1795 
1796 /*
1797  * Given a list of columns to display, output appropriate headers for each one.
1798  */
1799 static void
1800 print_header(zprop_list_t *pl)
1801 {
1802 	char headerbuf[ZFS_MAXPROPLEN];
1803 	const char *header;
1804 	int i;
1805 	boolean_t first = B_TRUE;
1806 	boolean_t right_justify;
1807 
1808 	for (; pl != NULL; pl = pl->pl_next) {
1809 		if (!first) {
1810 			(void) printf("  ");
1811 		} else {
1812 			first = B_FALSE;
1813 		}
1814 
1815 		right_justify = B_FALSE;
1816 		if (pl->pl_prop != ZPROP_INVAL) {
1817 			header = zfs_prop_column_name(pl->pl_prop);
1818 			right_justify = zfs_prop_align_right(pl->pl_prop);
1819 		} else {
1820 			for (i = 0; pl->pl_user_prop[i] != '\0'; i++)
1821 				headerbuf[i] = toupper(pl->pl_user_prop[i]);
1822 			headerbuf[i] = '\0';
1823 			header = headerbuf;
1824 		}
1825 
1826 		if (pl->pl_next == NULL && !right_justify)
1827 			(void) printf("%s", header);
1828 		else if (right_justify)
1829 			(void) printf("%*s", pl->pl_width, header);
1830 		else
1831 			(void) printf("%-*s", pl->pl_width, header);
1832 	}
1833 
1834 	(void) printf("\n");
1835 }
1836 
1837 /*
1838  * Given a dataset and a list of fields, print out all the properties according
1839  * to the described layout.
1840  */
1841 static void
1842 print_dataset(zfs_handle_t *zhp, zprop_list_t *pl, boolean_t scripted)
1843 {
1844 	boolean_t first = B_TRUE;
1845 	char property[ZFS_MAXPROPLEN];
1846 	nvlist_t *userprops = zfs_get_user_props(zhp);
1847 	nvlist_t *propval;
1848 	char *propstr;
1849 	boolean_t right_justify;
1850 	int width;
1851 
1852 	for (; pl != NULL; pl = pl->pl_next) {
1853 		if (!first) {
1854 			if (scripted)
1855 				(void) printf("\t");
1856 			else
1857 				(void) printf("  ");
1858 		} else {
1859 			first = B_FALSE;
1860 		}
1861 
1862 		if (pl->pl_prop != ZPROP_INVAL) {
1863 			if (zfs_prop_get(zhp, pl->pl_prop, property,
1864 			    sizeof (property), NULL, NULL, 0, B_FALSE) != 0)
1865 				propstr = "-";
1866 			else
1867 				propstr = property;
1868 
1869 			right_justify = zfs_prop_align_right(pl->pl_prop);
1870 		} else if (zfs_prop_userquota(pl->pl_user_prop)) {
1871 			if (zfs_prop_get_userquota(zhp, pl->pl_user_prop,
1872 			    property, sizeof (property), B_FALSE) != 0)
1873 				propstr = "-";
1874 			else
1875 				propstr = property;
1876 			right_justify = B_TRUE;
1877 		} else {
1878 			if (nvlist_lookup_nvlist(userprops,
1879 			    pl->pl_user_prop, &propval) != 0)
1880 				propstr = "-";
1881 			else
1882 				verify(nvlist_lookup_string(propval,
1883 				    ZPROP_VALUE, &propstr) == 0);
1884 			right_justify = B_FALSE;
1885 		}
1886 
1887 		width = pl->pl_width;
1888 
1889 		/*
1890 		 * If this is being called in scripted mode, or if this is the
1891 		 * last column and it is left-justified, don't include a width
1892 		 * format specifier.
1893 		 */
1894 		if (scripted || (pl->pl_next == NULL && !right_justify))
1895 			(void) printf("%s", propstr);
1896 		else if (right_justify)
1897 			(void) printf("%*s", width, propstr);
1898 		else
1899 			(void) printf("%-*s", width, propstr);
1900 	}
1901 
1902 	(void) printf("\n");
1903 }
1904 
1905 /*
1906  * Generic callback function to list a dataset or snapshot.
1907  */
1908 static int
1909 list_callback(zfs_handle_t *zhp, void *data)
1910 {
1911 	list_cbdata_t *cbp = data;
1912 
1913 	if (cbp->cb_first) {
1914 		if (!cbp->cb_scripted)
1915 			print_header(cbp->cb_proplist);
1916 		cbp->cb_first = B_FALSE;
1917 	}
1918 
1919 	print_dataset(zhp, cbp->cb_proplist, cbp->cb_scripted);
1920 
1921 	return (0);
1922 }
1923 
1924 static int
1925 zfs_do_list(int argc, char **argv)
1926 {
1927 	int c;
1928 	boolean_t scripted = B_FALSE;
1929 	static char default_fields[] =
1930 	    "name,used,available,referenced,mountpoint";
1931 	int types = ZFS_TYPE_DATASET;
1932 	boolean_t types_specified = B_FALSE;
1933 	char *fields = NULL;
1934 	list_cbdata_t cb = { 0 };
1935 	char *value;
1936 	int limit = 0;
1937 	int ret;
1938 	zfs_sort_column_t *sortcol = NULL;
1939 	int flags = ZFS_ITER_PROP_LISTSNAPS | ZFS_ITER_ARGS_CAN_BE_PATHS;
1940 
1941 	/* check options */
1942 	while ((c = getopt(argc, argv, ":d:o:rt:Hs:S:")) != -1) {
1943 		switch (c) {
1944 		case 'o':
1945 			fields = optarg;
1946 			break;
1947 		case 'd':
1948 			limit = parse_depth(optarg, &flags);
1949 			break;
1950 		case 'r':
1951 			flags |= ZFS_ITER_RECURSE;
1952 			break;
1953 		case 'H':
1954 			scripted = B_TRUE;
1955 			break;
1956 		case 's':
1957 			if (zfs_add_sort_column(&sortcol, optarg,
1958 			    B_FALSE) != 0) {
1959 				(void) fprintf(stderr,
1960 				    gettext("invalid property '%s'\n"), optarg);
1961 				usage(B_FALSE);
1962 			}
1963 			break;
1964 		case 'S':
1965 			if (zfs_add_sort_column(&sortcol, optarg,
1966 			    B_TRUE) != 0) {
1967 				(void) fprintf(stderr,
1968 				    gettext("invalid property '%s'\n"), optarg);
1969 				usage(B_FALSE);
1970 			}
1971 			break;
1972 		case 't':
1973 			types = 0;
1974 			types_specified = B_TRUE;
1975 			flags &= ~ZFS_ITER_PROP_LISTSNAPS;
1976 			while (*optarg != '\0') {
1977 				static char *type_subopts[] = { "filesystem",
1978 				    "volume", "snapshot", "all", NULL };
1979 
1980 				switch (getsubopt(&optarg, type_subopts,
1981 				    &value)) {
1982 				case 0:
1983 					types |= ZFS_TYPE_FILESYSTEM;
1984 					break;
1985 				case 1:
1986 					types |= ZFS_TYPE_VOLUME;
1987 					break;
1988 				case 2:
1989 					types |= ZFS_TYPE_SNAPSHOT;
1990 					break;
1991 				case 3:
1992 					types = ZFS_TYPE_DATASET;
1993 					break;
1994 
1995 				default:
1996 					(void) fprintf(stderr,
1997 					    gettext("invalid type '%s'\n"),
1998 					    value);
1999 					usage(B_FALSE);
2000 				}
2001 			}
2002 			break;
2003 		case ':':
2004 			(void) fprintf(stderr, gettext("missing argument for "
2005 			    "'%c' option\n"), optopt);
2006 			usage(B_FALSE);
2007 			break;
2008 		case '?':
2009 			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
2010 			    optopt);
2011 			usage(B_FALSE);
2012 		}
2013 	}
2014 
2015 	argc -= optind;
2016 	argv += optind;
2017 
2018 	if (fields == NULL)
2019 		fields = default_fields;
2020 
2021 	/*
2022 	 * If "-o space" and no types were specified, don't display snapshots.
2023 	 */
2024 	if (strcmp(fields, "space") == 0 && types_specified == B_FALSE)
2025 		types &= ~ZFS_TYPE_SNAPSHOT;
2026 
2027 	/*
2028 	 * If the user specifies '-o all', the zprop_get_list() doesn't
2029 	 * normally include the name of the dataset.  For 'zfs list', we always
2030 	 * want this property to be first.
2031 	 */
2032 	if (zprop_get_list(g_zfs, fields, &cb.cb_proplist, ZFS_TYPE_DATASET)
2033 	    != 0)
2034 		usage(B_FALSE);
2035 
2036 	cb.cb_scripted = scripted;
2037 	cb.cb_first = B_TRUE;
2038 
2039 	ret = zfs_for_each(argc, argv, flags, types, sortcol, &cb.cb_proplist,
2040 	    limit, list_callback, &cb);
2041 
2042 	zprop_free_list(cb.cb_proplist);
2043 	zfs_free_sort_columns(sortcol);
2044 
2045 	if (ret == 0 && cb.cb_first && !cb.cb_scripted)
2046 		(void) printf(gettext("no datasets available\n"));
2047 
2048 	return (ret);
2049 }
2050 
2051 /*
2052  * zfs rename <fs | snap | vol> <fs | snap | vol>
2053  * zfs rename -p <fs | vol> <fs | vol>
2054  * zfs rename -r <snap> <snap>
2055  *
2056  * Renames the given dataset to another of the same type.
2057  *
2058  * The '-p' flag creates all the non-existing ancestors of the target first.
2059  */
2060 /* ARGSUSED */
2061 static int
2062 zfs_do_rename(int argc, char **argv)
2063 {
2064 	zfs_handle_t *zhp;
2065 	int c;
2066 	int ret;
2067 	boolean_t recurse = B_FALSE;
2068 	boolean_t parents = B_FALSE;
2069 
2070 	/* check options */
2071 	while ((c = getopt(argc, argv, "pr")) != -1) {
2072 		switch (c) {
2073 		case 'p':
2074 			parents = B_TRUE;
2075 			break;
2076 		case 'r':
2077 			recurse = B_TRUE;
2078 			break;
2079 		case '?':
2080 		default:
2081 			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
2082 			    optopt);
2083 			usage(B_FALSE);
2084 		}
2085 	}
2086 
2087 	argc -= optind;
2088 	argv += optind;
2089 
2090 	/* check number of arguments */
2091 	if (argc < 1) {
2092 		(void) fprintf(stderr, gettext("missing source dataset "
2093 		    "argument\n"));
2094 		usage(B_FALSE);
2095 	}
2096 	if (argc < 2) {
2097 		(void) fprintf(stderr, gettext("missing target dataset "
2098 		    "argument\n"));
2099 		usage(B_FALSE);
2100 	}
2101 	if (argc > 2) {
2102 		(void) fprintf(stderr, gettext("too many arguments\n"));
2103 		usage(B_FALSE);
2104 	}
2105 
2106 	if (recurse && parents) {
2107 		(void) fprintf(stderr, gettext("-p and -r options are mutually "
2108 		    "exclusive\n"));
2109 		usage(B_FALSE);
2110 	}
2111 
2112 	if (recurse && strchr(argv[0], '@') == 0) {
2113 		(void) fprintf(stderr, gettext("source dataset for recursive "
2114 		    "rename must be a snapshot\n"));
2115 		usage(B_FALSE);
2116 	}
2117 
2118 	if ((zhp = zfs_open(g_zfs, argv[0], parents ? ZFS_TYPE_FILESYSTEM |
2119 	    ZFS_TYPE_VOLUME : ZFS_TYPE_DATASET)) == NULL)
2120 		return (1);
2121 
2122 	/* If we were asked and the name looks good, try to create ancestors. */
2123 	if (parents && zfs_name_valid(argv[1], zfs_get_type(zhp)) &&
2124 	    zfs_create_ancestors(g_zfs, argv[1]) != 0) {
2125 		zfs_close(zhp);
2126 		return (1);
2127 	}
2128 
2129 	ret = (zfs_rename(zhp, argv[1], recurse) != 0);
2130 
2131 	zfs_close(zhp);
2132 	return (ret);
2133 }
2134 
2135 /*
2136  * zfs promote <fs>
2137  *
2138  * Promotes the given clone fs to be the parent
2139  */
2140 /* ARGSUSED */
2141 static int
2142 zfs_do_promote(int argc, char **argv)
2143 {
2144 	zfs_handle_t *zhp;
2145 	int ret;
2146 
2147 	/* check options */
2148 	if (argc > 1 && argv[1][0] == '-') {
2149 		(void) fprintf(stderr, gettext("invalid option '%c'\n"),
2150 		    argv[1][1]);
2151 		usage(B_FALSE);
2152 	}
2153 
2154 	/* check number of arguments */
2155 	if (argc < 2) {
2156 		(void) fprintf(stderr, gettext("missing clone filesystem"
2157 		    " argument\n"));
2158 		usage(B_FALSE);
2159 	}
2160 	if (argc > 2) {
2161 		(void) fprintf(stderr, gettext("too many arguments\n"));
2162 		usage(B_FALSE);
2163 	}
2164 
2165 	zhp = zfs_open(g_zfs, argv[1], ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME);
2166 	if (zhp == NULL)
2167 		return (1);
2168 
2169 	ret = (zfs_promote(zhp) != 0);
2170 
2171 
2172 	zfs_close(zhp);
2173 	return (ret);
2174 }
2175 
2176 /*
2177  * zfs rollback [-rRf] <snapshot>
2178  *
2179  * 	-r	Delete any intervening snapshots before doing rollback
2180  * 	-R	Delete any snapshots and their clones
2181  * 	-f	ignored for backwards compatability
2182  *
2183  * Given a filesystem, rollback to a specific snapshot, discarding any changes
2184  * since then and making it the active dataset.  If more recent snapshots exist,
2185  * the command will complain unless the '-r' flag is given.
2186  */
2187 typedef struct rollback_cbdata {
2188 	uint64_t	cb_create;
2189 	boolean_t	cb_first;
2190 	int		cb_doclones;
2191 	char		*cb_target;
2192 	int		cb_error;
2193 	boolean_t	cb_recurse;
2194 	boolean_t	cb_dependent;
2195 } rollback_cbdata_t;
2196 
2197 /*
2198  * Report any snapshots more recent than the one specified.  Used when '-r' is
2199  * not specified.  We reuse this same callback for the snapshot dependents - if
2200  * 'cb_dependent' is set, then this is a dependent and we should report it
2201  * without checking the transaction group.
2202  */
2203 static int
2204 rollback_check(zfs_handle_t *zhp, void *data)
2205 {
2206 	rollback_cbdata_t *cbp = data;
2207 
2208 	if (cbp->cb_doclones) {
2209 		zfs_close(zhp);
2210 		return (0);
2211 	}
2212 
2213 	if (!cbp->cb_dependent) {
2214 		if (strcmp(zfs_get_name(zhp), cbp->cb_target) != 0 &&
2215 		    zfs_get_type(zhp) == ZFS_TYPE_SNAPSHOT &&
2216 		    zfs_prop_get_int(zhp, ZFS_PROP_CREATETXG) >
2217 		    cbp->cb_create) {
2218 
2219 			if (cbp->cb_first && !cbp->cb_recurse) {
2220 				(void) fprintf(stderr, gettext("cannot "
2221 				    "rollback to '%s': more recent snapshots "
2222 				    "exist\n"),
2223 				    cbp->cb_target);
2224 				(void) fprintf(stderr, gettext("use '-r' to "
2225 				    "force deletion of the following "
2226 				    "snapshots:\n"));
2227 				cbp->cb_first = 0;
2228 				cbp->cb_error = 1;
2229 			}
2230 
2231 			if (cbp->cb_recurse) {
2232 				cbp->cb_dependent = B_TRUE;
2233 				if (zfs_iter_dependents(zhp, B_TRUE,
2234 				    rollback_check, cbp) != 0) {
2235 					zfs_close(zhp);
2236 					return (-1);
2237 				}
2238 				cbp->cb_dependent = B_FALSE;
2239 			} else {
2240 				(void) fprintf(stderr, "%s\n",
2241 				    zfs_get_name(zhp));
2242 			}
2243 		}
2244 	} else {
2245 		if (cbp->cb_first && cbp->cb_recurse) {
2246 			(void) fprintf(stderr, gettext("cannot rollback to "
2247 			    "'%s': clones of previous snapshots exist\n"),
2248 			    cbp->cb_target);
2249 			(void) fprintf(stderr, gettext("use '-R' to "
2250 			    "force deletion of the following clones and "
2251 			    "dependents:\n"));
2252 			cbp->cb_first = 0;
2253 			cbp->cb_error = 1;
2254 		}
2255 
2256 		(void) fprintf(stderr, "%s\n", zfs_get_name(zhp));
2257 	}
2258 
2259 	zfs_close(zhp);
2260 	return (0);
2261 }
2262 
2263 static int
2264 zfs_do_rollback(int argc, char **argv)
2265 {
2266 	int ret;
2267 	int c;
2268 	boolean_t force = B_FALSE;
2269 	rollback_cbdata_t cb = { 0 };
2270 	zfs_handle_t *zhp, *snap;
2271 	char parentname[ZFS_MAXNAMELEN];
2272 	char *delim;
2273 
2274 	/* check options */
2275 	while ((c = getopt(argc, argv, "rRf")) != -1) {
2276 		switch (c) {
2277 		case 'r':
2278 			cb.cb_recurse = 1;
2279 			break;
2280 		case 'R':
2281 			cb.cb_recurse = 1;
2282 			cb.cb_doclones = 1;
2283 			break;
2284 		case 'f':
2285 			force = B_TRUE;
2286 			break;
2287 		case '?':
2288 			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
2289 			    optopt);
2290 			usage(B_FALSE);
2291 		}
2292 	}
2293 
2294 	argc -= optind;
2295 	argv += optind;
2296 
2297 	/* check number of arguments */
2298 	if (argc < 1) {
2299 		(void) fprintf(stderr, gettext("missing dataset argument\n"));
2300 		usage(B_FALSE);
2301 	}
2302 	if (argc > 1) {
2303 		(void) fprintf(stderr, gettext("too many arguments\n"));
2304 		usage(B_FALSE);
2305 	}
2306 
2307 	/* open the snapshot */
2308 	if ((snap = zfs_open(g_zfs, argv[0], ZFS_TYPE_SNAPSHOT)) == NULL)
2309 		return (1);
2310 
2311 	/* open the parent dataset */
2312 	(void) strlcpy(parentname, argv[0], sizeof (parentname));
2313 	verify((delim = strrchr(parentname, '@')) != NULL);
2314 	*delim = '\0';
2315 	if ((zhp = zfs_open(g_zfs, parentname, ZFS_TYPE_DATASET)) == NULL) {
2316 		zfs_close(snap);
2317 		return (1);
2318 	}
2319 
2320 	/*
2321 	 * Check for more recent snapshots and/or clones based on the presence
2322 	 * of '-r' and '-R'.
2323 	 */
2324 	cb.cb_target = argv[0];
2325 	cb.cb_create = zfs_prop_get_int(snap, ZFS_PROP_CREATETXG);
2326 	cb.cb_first = B_TRUE;
2327 	cb.cb_error = 0;
2328 	if ((ret = zfs_iter_children(zhp, rollback_check, &cb)) != 0)
2329 		goto out;
2330 
2331 	if ((ret = cb.cb_error) != 0)
2332 		goto out;
2333 
2334 	/*
2335 	 * Rollback parent to the given snapshot.
2336 	 */
2337 	ret = zfs_rollback(zhp, snap, force);
2338 
2339 out:
2340 	zfs_close(snap);
2341 	zfs_close(zhp);
2342 
2343 	if (ret == 0)
2344 		return (0);
2345 	else
2346 		return (1);
2347 }
2348 
2349 /*
2350  * zfs set property=value { fs | snap | vol } ...
2351  *
2352  * Sets the given property for all datasets specified on the command line.
2353  */
2354 typedef struct set_cbdata {
2355 	char		*cb_propname;
2356 	char		*cb_value;
2357 } set_cbdata_t;
2358 
2359 static int
2360 set_callback(zfs_handle_t *zhp, void *data)
2361 {
2362 	set_cbdata_t *cbp = data;
2363 
2364 	if (zfs_prop_set(zhp, cbp->cb_propname, cbp->cb_value) != 0) {
2365 		switch (libzfs_errno(g_zfs)) {
2366 		case EZFS_MOUNTFAILED:
2367 			(void) fprintf(stderr, gettext("property may be set "
2368 			    "but unable to remount filesystem\n"));
2369 			break;
2370 		case EZFS_SHARENFSFAILED:
2371 			(void) fprintf(stderr, gettext("property may be set "
2372 			    "but unable to reshare filesystem\n"));
2373 			break;
2374 		}
2375 		return (1);
2376 	}
2377 	return (0);
2378 }
2379 
2380 static int
2381 zfs_do_set(int argc, char **argv)
2382 {
2383 	set_cbdata_t cb;
2384 	int ret;
2385 
2386 	/* check for options */
2387 	if (argc > 1 && argv[1][0] == '-') {
2388 		(void) fprintf(stderr, gettext("invalid option '%c'\n"),
2389 		    argv[1][1]);
2390 		usage(B_FALSE);
2391 	}
2392 
2393 	/* check number of arguments */
2394 	if (argc < 2) {
2395 		(void) fprintf(stderr, gettext("missing property=value "
2396 		    "argument\n"));
2397 		usage(B_FALSE);
2398 	}
2399 	if (argc < 3) {
2400 		(void) fprintf(stderr, gettext("missing dataset name\n"));
2401 		usage(B_FALSE);
2402 	}
2403 
2404 	/* validate property=value argument */
2405 	cb.cb_propname = argv[1];
2406 	if (((cb.cb_value = strchr(cb.cb_propname, '=')) == NULL) ||
2407 	    (cb.cb_value[1] == '\0')) {
2408 		(void) fprintf(stderr, gettext("missing value in "
2409 		    "property=value argument\n"));
2410 		usage(B_FALSE);
2411 	}
2412 
2413 	*cb.cb_value = '\0';
2414 	cb.cb_value++;
2415 
2416 	if (*cb.cb_propname == '\0') {
2417 		(void) fprintf(stderr,
2418 		    gettext("missing property in property=value argument\n"));
2419 		usage(B_FALSE);
2420 	}
2421 
2422 	ret = zfs_for_each(argc - 2, argv + 2, NULL,
2423 	    ZFS_TYPE_DATASET, NULL, NULL, 0, set_callback, &cb);
2424 
2425 	return (ret);
2426 }
2427 
2428 /*
2429  * zfs snapshot [-r] [-o prop=value] ... <fs@snap>
2430  *
2431  * Creates a snapshot with the given name.  While functionally equivalent to
2432  * 'zfs create', it is a separate command to differentiate intent.
2433  */
2434 static int
2435 zfs_do_snapshot(int argc, char **argv)
2436 {
2437 	boolean_t recursive = B_FALSE;
2438 	int ret;
2439 	char c;
2440 	nvlist_t *props;
2441 
2442 	if (nvlist_alloc(&props, NV_UNIQUE_NAME, 0) != 0) {
2443 		(void) fprintf(stderr, gettext("internal error: "
2444 		    "out of memory\n"));
2445 		return (1);
2446 	}
2447 
2448 	/* check options */
2449 	while ((c = getopt(argc, argv, "ro:")) != -1) {
2450 		switch (c) {
2451 		case 'o':
2452 			if (parseprop(props))
2453 				return (1);
2454 			break;
2455 		case 'r':
2456 			recursive = B_TRUE;
2457 			break;
2458 		case '?':
2459 			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
2460 			    optopt);
2461 			goto usage;
2462 		}
2463 	}
2464 
2465 	argc -= optind;
2466 	argv += optind;
2467 
2468 	/* check number of arguments */
2469 	if (argc < 1) {
2470 		(void) fprintf(stderr, gettext("missing snapshot argument\n"));
2471 		goto usage;
2472 	}
2473 	if (argc > 1) {
2474 		(void) fprintf(stderr, gettext("too many arguments\n"));
2475 		goto usage;
2476 	}
2477 
2478 	ret = zfs_snapshot(g_zfs, argv[0], recursive, props);
2479 	nvlist_free(props);
2480 	if (ret && recursive)
2481 		(void) fprintf(stderr, gettext("no snapshots were created\n"));
2482 	return (ret != 0);
2483 
2484 usage:
2485 	nvlist_free(props);
2486 	usage(B_FALSE);
2487 	return (-1);
2488 }
2489 
2490 /*
2491  * zfs send [-v] -R [-i|-I <@snap>] <fs@snap>
2492  * zfs send [-v] [-i|-I <@snap>] <fs@snap>
2493  *
2494  * Send a backup stream to stdout.
2495  */
2496 static int
2497 zfs_do_send(int argc, char **argv)
2498 {
2499 	char *fromname = NULL;
2500 	char *toname = NULL;
2501 	char *cp;
2502 	zfs_handle_t *zhp;
2503 	boolean_t doall = B_FALSE;
2504 	boolean_t replicate = B_FALSE;
2505 	boolean_t fromorigin = B_FALSE;
2506 	boolean_t verbose = B_FALSE;
2507 	int c, err;
2508 
2509 	/* check options */
2510 	while ((c = getopt(argc, argv, ":i:I:Rv")) != -1) {
2511 		switch (c) {
2512 		case 'i':
2513 			if (fromname)
2514 				usage(B_FALSE);
2515 			fromname = optarg;
2516 			break;
2517 		case 'I':
2518 			if (fromname)
2519 				usage(B_FALSE);
2520 			fromname = optarg;
2521 			doall = B_TRUE;
2522 			break;
2523 		case 'R':
2524 			replicate = B_TRUE;
2525 			break;
2526 		case 'v':
2527 			verbose = B_TRUE;
2528 			break;
2529 		case ':':
2530 			(void) fprintf(stderr, gettext("missing argument for "
2531 			    "'%c' option\n"), optopt);
2532 			usage(B_FALSE);
2533 			break;
2534 		case '?':
2535 			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
2536 			    optopt);
2537 			usage(B_FALSE);
2538 		}
2539 	}
2540 
2541 	argc -= optind;
2542 	argv += optind;
2543 
2544 	/* check number of arguments */
2545 	if (argc < 1) {
2546 		(void) fprintf(stderr, gettext("missing snapshot argument\n"));
2547 		usage(B_FALSE);
2548 	}
2549 	if (argc > 1) {
2550 		(void) fprintf(stderr, gettext("too many arguments\n"));
2551 		usage(B_FALSE);
2552 	}
2553 
2554 	if (isatty(STDOUT_FILENO)) {
2555 		(void) fprintf(stderr,
2556 		    gettext("Error: Stream can not be written to a terminal.\n"
2557 		    "You must redirect standard output.\n"));
2558 		return (1);
2559 	}
2560 
2561 	cp = strchr(argv[0], '@');
2562 	if (cp == NULL) {
2563 		(void) fprintf(stderr,
2564 		    gettext("argument must be a snapshot\n"));
2565 		usage(B_FALSE);
2566 	}
2567 	*cp = '\0';
2568 	toname = cp + 1;
2569 	zhp = zfs_open(g_zfs, argv[0], ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME);
2570 	if (zhp == NULL)
2571 		return (1);
2572 
2573 	/*
2574 	 * If they specified the full path to the snapshot, chop off
2575 	 * everything except the short name of the snapshot, but special
2576 	 * case if they specify the origin.
2577 	 */
2578 	if (fromname && (cp = strchr(fromname, '@')) != NULL) {
2579 		char origin[ZFS_MAXNAMELEN];
2580 		zprop_source_t src;
2581 
2582 		(void) zfs_prop_get(zhp, ZFS_PROP_ORIGIN,
2583 		    origin, sizeof (origin), &src, NULL, 0, B_FALSE);
2584 
2585 		if (strcmp(origin, fromname) == 0) {
2586 			fromname = NULL;
2587 			fromorigin = B_TRUE;
2588 		} else {
2589 			*cp = '\0';
2590 			if (cp != fromname && strcmp(argv[0], fromname)) {
2591 				(void) fprintf(stderr,
2592 				    gettext("incremental source must be "
2593 				    "in same filesystem\n"));
2594 				usage(B_FALSE);
2595 			}
2596 			fromname = cp + 1;
2597 			if (strchr(fromname, '@') || strchr(fromname, '/')) {
2598 				(void) fprintf(stderr,
2599 				    gettext("invalid incremental source\n"));
2600 				usage(B_FALSE);
2601 			}
2602 		}
2603 	}
2604 
2605 	if (replicate && fromname == NULL)
2606 		doall = B_TRUE;
2607 
2608 	err = zfs_send(zhp, fromname, toname, replicate, doall, fromorigin,
2609 	    verbose, STDOUT_FILENO);
2610 	zfs_close(zhp);
2611 
2612 	return (err != 0);
2613 }
2614 
2615 /*
2616  * zfs receive [-dnvF] <fs@snap>
2617  *
2618  * Restore a backup stream from stdin.
2619  */
2620 static int
2621 zfs_do_receive(int argc, char **argv)
2622 {
2623 	int c, err;
2624 	recvflags_t flags;
2625 
2626 	bzero(&flags, sizeof (recvflags_t));
2627 	/* check options */
2628 	while ((c = getopt(argc, argv, ":dnuvF")) != -1) {
2629 		switch (c) {
2630 		case 'd':
2631 			flags.isprefix = B_TRUE;
2632 			break;
2633 		case 'n':
2634 			flags.dryrun = B_TRUE;
2635 			break;
2636 		case 'u':
2637 			flags.nomount = B_TRUE;
2638 			break;
2639 		case 'v':
2640 			flags.verbose = B_TRUE;
2641 			break;
2642 		case 'F':
2643 			flags.force = B_TRUE;
2644 			break;
2645 		case ':':
2646 			(void) fprintf(stderr, gettext("missing argument for "
2647 			    "'%c' option\n"), optopt);
2648 			usage(B_FALSE);
2649 			break;
2650 		case '?':
2651 			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
2652 			    optopt);
2653 			usage(B_FALSE);
2654 		}
2655 	}
2656 
2657 	argc -= optind;
2658 	argv += optind;
2659 
2660 	/* check number of arguments */
2661 	if (argc < 1) {
2662 		(void) fprintf(stderr, gettext("missing snapshot argument\n"));
2663 		usage(B_FALSE);
2664 	}
2665 	if (argc > 1) {
2666 		(void) fprintf(stderr, gettext("too many arguments\n"));
2667 		usage(B_FALSE);
2668 	}
2669 
2670 	if (isatty(STDIN_FILENO)) {
2671 		(void) fprintf(stderr,
2672 		    gettext("Error: Backup stream can not be read "
2673 		    "from a terminal.\n"
2674 		    "You must redirect standard input.\n"));
2675 		return (1);
2676 	}
2677 
2678 	err = zfs_receive(g_zfs, argv[0], flags, STDIN_FILENO, NULL);
2679 
2680 	return (err != 0);
2681 }
2682 
2683 static int
2684 zfs_do_hold_rele_impl(int argc, char **argv, boolean_t holding)
2685 {
2686 	int errors = 0;
2687 	int i;
2688 	const char *tag;
2689 	boolean_t recursive = B_FALSE;
2690 	boolean_t temphold = B_FALSE;
2691 	const char *opts = holding ? "rt" : "r";
2692 	int c;
2693 
2694 	/* check options */
2695 	while ((c = getopt(argc, argv, opts)) != -1) {
2696 		switch (c) {
2697 		case 'r':
2698 			recursive = B_TRUE;
2699 			break;
2700 		case 't':
2701 			temphold = B_TRUE;
2702 			break;
2703 		case '?':
2704 			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
2705 			    optopt);
2706 			usage(B_FALSE);
2707 		}
2708 	}
2709 
2710 	argc -= optind;
2711 	argv += optind;
2712 
2713 	/* check number of arguments */
2714 	if (argc < 2)
2715 		usage(B_FALSE);
2716 
2717 	tag = argv[0];
2718 	--argc;
2719 	++argv;
2720 
2721 	if (holding && tag[0] == '.') {
2722 		/* tags starting with '.' are reserved for libzfs */
2723 		(void) fprintf(stderr, gettext("tag may not start with '.'\n"));
2724 		usage(B_FALSE);
2725 	}
2726 
2727 	for (i = 0; i < argc; ++i) {
2728 		zfs_handle_t *zhp;
2729 		char parent[ZFS_MAXNAMELEN];
2730 		const char *delim;
2731 		char *path = argv[i];
2732 
2733 		delim = strchr(path, '@');
2734 		if (delim == NULL) {
2735 			(void) fprintf(stderr,
2736 			    gettext("'%s' is not a snapshot\n"), path);
2737 			++errors;
2738 			continue;
2739 		}
2740 		(void) strncpy(parent, path, delim - path);
2741 		parent[delim - path] = '\0';
2742 
2743 		zhp = zfs_open(g_zfs, parent,
2744 		    ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME);
2745 		if (zhp == NULL) {
2746 			++errors;
2747 			continue;
2748 		}
2749 		if (holding) {
2750 			if (zfs_hold(zhp, delim+1, tag, recursive,
2751 			    temphold) != 0)
2752 				++errors;
2753 		} else {
2754 			if (zfs_release(zhp, delim+1, tag, recursive) != 0)
2755 				++errors;
2756 		}
2757 		zfs_close(zhp);
2758 	}
2759 
2760 	return (errors != 0);
2761 }
2762 
2763 /*
2764  * zfs hold [-r] [-t] <tag> <snap> ...
2765  *
2766  * 	-r	Recursively hold
2767  *	-t	Temporary hold (hidden option)
2768  *
2769  * Apply a user-hold with the given tag to the list of snapshots.
2770  */
2771 static int
2772 zfs_do_hold(int argc, char **argv)
2773 {
2774 	return (zfs_do_hold_rele_impl(argc, argv, B_TRUE));
2775 }
2776 
2777 /*
2778  * zfs release [-r] <tag> <snap> ...
2779  *
2780  * 	-r	Recursively release
2781  *
2782  * Release a user-hold with the given tag from the list of snapshots.
2783  */
2784 static int
2785 zfs_do_release(int argc, char **argv)
2786 {
2787 	return (zfs_do_hold_rele_impl(argc, argv, B_FALSE));
2788 }
2789 
2790 typedef struct get_all_cbdata {
2791 	zfs_handle_t	**cb_handles;
2792 	size_t		cb_alloc;
2793 	size_t		cb_used;
2794 	uint_t		cb_types;
2795 	boolean_t	cb_verbose;
2796 } get_all_cbdata_t;
2797 
2798 #define	CHECK_SPINNER 30
2799 #define	SPINNER_TIME 3		/* seconds */
2800 #define	MOUNT_TIME 5		/* seconds */
2801 
2802 static int
2803 get_one_dataset(zfs_handle_t *zhp, void *data)
2804 {
2805 	static char spin[] = { '-', '\\', '|', '/' };
2806 	static int spinval = 0;
2807 	static int spincheck = 0;
2808 	static time_t last_spin_time = (time_t)0;
2809 	get_all_cbdata_t *cbp = data;
2810 	zfs_type_t type = zfs_get_type(zhp);
2811 
2812 	if (cbp->cb_verbose) {
2813 		if (--spincheck < 0) {
2814 			time_t now = time(NULL);
2815 			if (last_spin_time + SPINNER_TIME < now) {
2816 				(void) printf("\b%c", spin[spinval++ % 4]);
2817 				(void) fflush(stdout);
2818 				last_spin_time = now;
2819 			}
2820 			spincheck = CHECK_SPINNER;
2821 		}
2822 	}
2823 
2824 	/*
2825 	 * Interate over any nested datasets.
2826 	 */
2827 	if (type == ZFS_TYPE_FILESYSTEM &&
2828 	    zfs_iter_filesystems(zhp, get_one_dataset, data) != 0) {
2829 		zfs_close(zhp);
2830 		return (1);
2831 	}
2832 
2833 	/*
2834 	 * Skip any datasets whose type does not match.
2835 	 */
2836 	if ((type & cbp->cb_types) == 0) {
2837 		zfs_close(zhp);
2838 		return (0);
2839 	}
2840 
2841 	if (cbp->cb_alloc == cbp->cb_used) {
2842 		zfs_handle_t **handles;
2843 
2844 		if (cbp->cb_alloc == 0)
2845 			cbp->cb_alloc = 64;
2846 		else
2847 			cbp->cb_alloc *= 2;
2848 
2849 		handles = safe_malloc(cbp->cb_alloc * sizeof (void *));
2850 
2851 		if (cbp->cb_handles) {
2852 			bcopy(cbp->cb_handles, handles,
2853 			    cbp->cb_used * sizeof (void *));
2854 			free(cbp->cb_handles);
2855 		}
2856 
2857 		cbp->cb_handles = handles;
2858 	}
2859 
2860 	cbp->cb_handles[cbp->cb_used++] = zhp;
2861 
2862 	return (0);
2863 }
2864 
2865 static void
2866 get_all_datasets(uint_t types, zfs_handle_t ***dslist, size_t *count,
2867     boolean_t verbose)
2868 {
2869 	get_all_cbdata_t cb = { 0 };
2870 	cb.cb_types = types;
2871 	cb.cb_verbose = verbose;
2872 
2873 	if (verbose) {
2874 		(void) printf("%s: *", gettext("Reading ZFS config"));
2875 		(void) fflush(stdout);
2876 	}
2877 
2878 	(void) zfs_iter_root(g_zfs, get_one_dataset, &cb);
2879 
2880 	*dslist = cb.cb_handles;
2881 	*count = cb.cb_used;
2882 
2883 	if (verbose) {
2884 		(void) printf("\b%s\n", gettext("done."));
2885 	}
2886 }
2887 
2888 static int
2889 dataset_cmp(const void *a, const void *b)
2890 {
2891 	zfs_handle_t **za = (zfs_handle_t **)a;
2892 	zfs_handle_t **zb = (zfs_handle_t **)b;
2893 	char mounta[MAXPATHLEN];
2894 	char mountb[MAXPATHLEN];
2895 	boolean_t gota, gotb;
2896 
2897 	if ((gota = (zfs_get_type(*za) == ZFS_TYPE_FILESYSTEM)) != 0)
2898 		verify(zfs_prop_get(*za, ZFS_PROP_MOUNTPOINT, mounta,
2899 		    sizeof (mounta), NULL, NULL, 0, B_FALSE) == 0);
2900 	if ((gotb = (zfs_get_type(*zb) == ZFS_TYPE_FILESYSTEM)) != 0)
2901 		verify(zfs_prop_get(*zb, ZFS_PROP_MOUNTPOINT, mountb,
2902 		    sizeof (mountb), NULL, NULL, 0, B_FALSE) == 0);
2903 
2904 	if (gota && gotb)
2905 		return (strcmp(mounta, mountb));
2906 
2907 	if (gota)
2908 		return (-1);
2909 	if (gotb)
2910 		return (1);
2911 
2912 	return (strcmp(zfs_get_name(a), zfs_get_name(b)));
2913 }
2914 
2915 /*
2916  * Generic callback for sharing or mounting filesystems.  Because the code is so
2917  * similar, we have a common function with an extra parameter to determine which
2918  * mode we are using.
2919  */
2920 #define	OP_SHARE	0x1
2921 #define	OP_MOUNT	0x2
2922 
2923 /*
2924  * Share or mount a dataset.
2925  */
2926 static int
2927 share_mount_one(zfs_handle_t *zhp, int op, int flags, char *protocol,
2928     boolean_t explicit, const char *options)
2929 {
2930 	char mountpoint[ZFS_MAXPROPLEN];
2931 	char shareopts[ZFS_MAXPROPLEN];
2932 	char smbshareopts[ZFS_MAXPROPLEN];
2933 	const char *cmdname = op == OP_SHARE ? "share" : "mount";
2934 	struct mnttab mnt;
2935 	uint64_t zoned, canmount;
2936 	zfs_type_t type = zfs_get_type(zhp);
2937 	boolean_t shared_nfs, shared_smb;
2938 
2939 	assert(type & (ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME));
2940 
2941 	if (type == ZFS_TYPE_FILESYSTEM) {
2942 		/*
2943 		 * Check to make sure we can mount/share this dataset.  If we
2944 		 * are in the global zone and the filesystem is exported to a
2945 		 * local zone, or if we are in a local zone and the
2946 		 * filesystem is not exported, then it is an error.
2947 		 */
2948 		zoned = zfs_prop_get_int(zhp, ZFS_PROP_ZONED);
2949 
2950 		if (zoned && getzoneid() == GLOBAL_ZONEID) {
2951 			if (!explicit)
2952 				return (0);
2953 
2954 			(void) fprintf(stderr, gettext("cannot %s '%s': "
2955 			    "dataset is exported to a local zone\n"), cmdname,
2956 			    zfs_get_name(zhp));
2957 			return (1);
2958 
2959 		} else if (!zoned && getzoneid() != GLOBAL_ZONEID) {
2960 			if (!explicit)
2961 				return (0);
2962 
2963 			(void) fprintf(stderr, gettext("cannot %s '%s': "
2964 			    "permission denied\n"), cmdname,
2965 			    zfs_get_name(zhp));
2966 			return (1);
2967 		}
2968 
2969 		/*
2970 		 * Ignore any filesystems which don't apply to us. This
2971 		 * includes those with a legacy mountpoint, or those with
2972 		 * legacy share options.
2973 		 */
2974 		verify(zfs_prop_get(zhp, ZFS_PROP_MOUNTPOINT, mountpoint,
2975 		    sizeof (mountpoint), NULL, NULL, 0, B_FALSE) == 0);
2976 		verify(zfs_prop_get(zhp, ZFS_PROP_SHARENFS, shareopts,
2977 		    sizeof (shareopts), NULL, NULL, 0, B_FALSE) == 0);
2978 		verify(zfs_prop_get(zhp, ZFS_PROP_SHARESMB, smbshareopts,
2979 		    sizeof (smbshareopts), NULL, NULL, 0, B_FALSE) == 0);
2980 
2981 		if (op == OP_SHARE && strcmp(shareopts, "off") == 0 &&
2982 		    strcmp(smbshareopts, "off") == 0) {
2983 			if (!explicit)
2984 				return (0);
2985 
2986 			(void) fprintf(stderr, gettext("cannot share '%s': "
2987 			    "legacy share\n"), zfs_get_name(zhp));
2988 			(void) fprintf(stderr, gettext("use share(1M) to "
2989 			    "share this filesystem, or set "
2990 			    "sharenfs property on\n"));
2991 			return (1);
2992 		}
2993 
2994 		/*
2995 		 * We cannot share or mount legacy filesystems. If the
2996 		 * shareopts is non-legacy but the mountpoint is legacy, we
2997 		 * treat it as a legacy share.
2998 		 */
2999 		if (strcmp(mountpoint, "legacy") == 0) {
3000 			if (!explicit)
3001 				return (0);
3002 
3003 			(void) fprintf(stderr, gettext("cannot %s '%s': "
3004 			    "legacy mountpoint\n"), cmdname, zfs_get_name(zhp));
3005 			(void) fprintf(stderr, gettext("use %s(1M) to "
3006 			    "%s this filesystem\n"), cmdname, cmdname);
3007 			return (1);
3008 		}
3009 
3010 		if (strcmp(mountpoint, "none") == 0) {
3011 			if (!explicit)
3012 				return (0);
3013 
3014 			(void) fprintf(stderr, gettext("cannot %s '%s': no "
3015 			    "mountpoint set\n"), cmdname, zfs_get_name(zhp));
3016 			return (1);
3017 		}
3018 
3019 		/*
3020 		 * canmount	explicit	outcome
3021 		 * on		no		pass through
3022 		 * on		yes		pass through
3023 		 * off		no		return 0
3024 		 * off		yes		display error, return 1
3025 		 * noauto	no		return 0
3026 		 * noauto	yes		pass through
3027 		 */
3028 		canmount = zfs_prop_get_int(zhp, ZFS_PROP_CANMOUNT);
3029 		if (canmount == ZFS_CANMOUNT_OFF) {
3030 			if (!explicit)
3031 				return (0);
3032 
3033 			(void) fprintf(stderr, gettext("cannot %s '%s': "
3034 			    "'canmount' property is set to 'off'\n"), cmdname,
3035 			    zfs_get_name(zhp));
3036 			return (1);
3037 		} else if (canmount == ZFS_CANMOUNT_NOAUTO && !explicit) {
3038 			return (0);
3039 		}
3040 
3041 		/*
3042 		 * At this point, we have verified that the mountpoint and/or
3043 		 * shareopts are appropriate for auto management. If the
3044 		 * filesystem is already mounted or shared, return (failing
3045 		 * for explicit requests); otherwise mount or share the
3046 		 * filesystem.
3047 		 */
3048 		switch (op) {
3049 		case OP_SHARE:
3050 
3051 			shared_nfs = zfs_is_shared_nfs(zhp, NULL);
3052 			shared_smb = zfs_is_shared_smb(zhp, NULL);
3053 
3054 			if (shared_nfs && shared_smb ||
3055 			    (shared_nfs && strcmp(shareopts, "on") == 0 &&
3056 			    strcmp(smbshareopts, "off") == 0) ||
3057 			    (shared_smb && strcmp(smbshareopts, "on") == 0 &&
3058 			    strcmp(shareopts, "off") == 0)) {
3059 				if (!explicit)
3060 					return (0);
3061 
3062 				(void) fprintf(stderr, gettext("cannot share "
3063 				    "'%s': filesystem already shared\n"),
3064 				    zfs_get_name(zhp));
3065 				return (1);
3066 			}
3067 
3068 			if (!zfs_is_mounted(zhp, NULL) &&
3069 			    zfs_mount(zhp, NULL, 0) != 0)
3070 				return (1);
3071 
3072 			if (protocol == NULL) {
3073 				if (zfs_shareall(zhp) != 0)
3074 					return (1);
3075 			} else if (strcmp(protocol, "nfs") == 0) {
3076 				if (zfs_share_nfs(zhp))
3077 					return (1);
3078 			} else if (strcmp(protocol, "smb") == 0) {
3079 				if (zfs_share_smb(zhp))
3080 					return (1);
3081 			} else {
3082 				(void) fprintf(stderr, gettext("cannot share "
3083 				    "'%s': invalid share type '%s' "
3084 				    "specified\n"),
3085 				    zfs_get_name(zhp), protocol);
3086 				return (1);
3087 			}
3088 
3089 			break;
3090 
3091 		case OP_MOUNT:
3092 			if (options == NULL)
3093 				mnt.mnt_mntopts = "";
3094 			else
3095 				mnt.mnt_mntopts = (char *)options;
3096 
3097 			if (!hasmntopt(&mnt, MNTOPT_REMOUNT) &&
3098 			    zfs_is_mounted(zhp, NULL)) {
3099 				if (!explicit)
3100 					return (0);
3101 
3102 				(void) fprintf(stderr, gettext("cannot mount "
3103 				    "'%s': filesystem already mounted\n"),
3104 				    zfs_get_name(zhp));
3105 				return (1);
3106 			}
3107 
3108 			if (zfs_mount(zhp, options, flags) != 0)
3109 				return (1);
3110 			break;
3111 		}
3112 	} else {
3113 		assert(op == OP_SHARE);
3114 
3115 		/*
3116 		 * Ignore any volumes that aren't shared.
3117 		 */
3118 		verify(zfs_prop_get(zhp, ZFS_PROP_SHAREISCSI, shareopts,
3119 		    sizeof (shareopts), NULL, NULL, 0, B_FALSE) == 0);
3120 
3121 		if (strcmp(shareopts, "off") == 0) {
3122 			if (!explicit)
3123 				return (0);
3124 
3125 			(void) fprintf(stderr, gettext("cannot share '%s': "
3126 			    "'shareiscsi' property not set\n"),
3127 			    zfs_get_name(zhp));
3128 			(void) fprintf(stderr, gettext("set 'shareiscsi' "
3129 			    "property or use iscsitadm(1M) to share this "
3130 			    "volume\n"));
3131 			return (1);
3132 		}
3133 
3134 		if (zfs_is_shared_iscsi(zhp)) {
3135 			if (!explicit)
3136 				return (0);
3137 
3138 			(void) fprintf(stderr, gettext("cannot share "
3139 			    "'%s': volume already shared\n"),
3140 			    zfs_get_name(zhp));
3141 			return (1);
3142 		}
3143 
3144 		if (zfs_share_iscsi(zhp) != 0)
3145 			return (1);
3146 	}
3147 
3148 	return (0);
3149 }
3150 
3151 /*
3152  * Reports progress in the form "(current/total)".  Not thread-safe.
3153  */
3154 static void
3155 report_mount_progress(int current, int total)
3156 {
3157 	static int len;
3158 	static char *reverse = "\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b"
3159 	    "\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b";
3160 	static time_t last_progress_time;
3161 	time_t now = time(NULL);
3162 
3163 	/* report 1..n instead of 0..n-1 */
3164 	++current;
3165 
3166 	/* display header if we're here for the first time */
3167 	if (current == 1) {
3168 		(void) printf(gettext("Mounting ZFS filesystems: "));
3169 		len = 0;
3170 	} else if (current != total && last_progress_time + MOUNT_TIME >= now) {
3171 		/* too soon to report again */
3172 		return;
3173 	}
3174 
3175 	last_progress_time = now;
3176 
3177 	/* back up to prepare for overwriting */
3178 	if (len)
3179 		(void) printf("%*.*s", len, len, reverse);
3180 
3181 	/* We put a newline at the end if this is the last one.  */
3182 	len = printf("(%d/%d)%s", current, total, current == total ? "\n" : "");
3183 	(void) fflush(stdout);
3184 }
3185 
3186 static void
3187 append_options(char *mntopts, char *newopts)
3188 {
3189 	int len = strlen(mntopts);
3190 
3191 	/* original length plus new string to append plus 1 for the comma */
3192 	if (len + 1 + strlen(newopts) >= MNT_LINE_MAX) {
3193 		(void) fprintf(stderr, gettext("the opts argument for "
3194 		    "'%c' option is too long (more than %d chars)\n"),
3195 		    "-o", MNT_LINE_MAX);
3196 		usage(B_FALSE);
3197 	}
3198 
3199 	if (*mntopts)
3200 		mntopts[len++] = ',';
3201 
3202 	(void) strcpy(&mntopts[len], newopts);
3203 }
3204 
3205 static int
3206 share_mount(int op, int argc, char **argv)
3207 {
3208 	int do_all = 0;
3209 	boolean_t verbose = B_FALSE;
3210 	int c, ret = 0;
3211 	char *options = NULL;
3212 	int types, flags = 0;
3213 
3214 	/* check options */
3215 	while ((c = getopt(argc, argv, op == OP_MOUNT ? ":avo:O" : "a"))
3216 	    != -1) {
3217 		switch (c) {
3218 		case 'a':
3219 			do_all = 1;
3220 			break;
3221 		case 'v':
3222 			verbose = B_TRUE;
3223 			break;
3224 		case 'o':
3225 			if (*optarg == '\0') {
3226 				(void) fprintf(stderr, gettext("empty mount "
3227 				    "options (-o) specified\n"));
3228 				usage(B_FALSE);
3229 			}
3230 
3231 			if (options == NULL)
3232 				options = safe_malloc(MNT_LINE_MAX + 1);
3233 
3234 			/* option validation is done later */
3235 			append_options(options, optarg);
3236 			break;
3237 
3238 		case 'O':
3239 			flags |= MS_OVERLAY;
3240 			break;
3241 		case ':':
3242 			(void) fprintf(stderr, gettext("missing argument for "
3243 			    "'%c' option\n"), optopt);
3244 			usage(B_FALSE);
3245 			break;
3246 		case '?':
3247 			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
3248 			    optopt);
3249 			usage(B_FALSE);
3250 		}
3251 	}
3252 
3253 	argc -= optind;
3254 	argv += optind;
3255 
3256 	/* check number of arguments */
3257 	if (do_all) {
3258 		zfs_handle_t **dslist = NULL;
3259 		size_t i, count = 0;
3260 		char *protocol = NULL;
3261 
3262 		if (op == OP_MOUNT) {
3263 			types = ZFS_TYPE_FILESYSTEM;
3264 		} else if (argc > 0) {
3265 			if (strcmp(argv[0], "nfs") == 0 ||
3266 			    strcmp(argv[0], "smb") == 0) {
3267 				types = ZFS_TYPE_FILESYSTEM;
3268 			} else if (strcmp(argv[0], "iscsi") == 0) {
3269 				types = ZFS_TYPE_VOLUME;
3270 			} else {
3271 				(void) fprintf(stderr, gettext("share type "
3272 				    "must be 'nfs', 'smb' or 'iscsi'\n"));
3273 				usage(B_FALSE);
3274 			}
3275 			protocol = argv[0];
3276 			argc--;
3277 			argv++;
3278 		} else {
3279 			types = ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME;
3280 		}
3281 
3282 		if (argc != 0) {
3283 			(void) fprintf(stderr, gettext("too many arguments\n"));
3284 			usage(B_FALSE);
3285 		}
3286 
3287 		get_all_datasets(types, &dslist, &count, verbose);
3288 
3289 		if (count == 0)
3290 			return (0);
3291 
3292 		qsort(dslist, count, sizeof (void *), dataset_cmp);
3293 
3294 		for (i = 0; i < count; i++) {
3295 			if (verbose)
3296 				report_mount_progress(i, count);
3297 
3298 			if (share_mount_one(dslist[i], op, flags, protocol,
3299 			    B_FALSE, options) != 0)
3300 				ret = 1;
3301 			zfs_close(dslist[i]);
3302 		}
3303 
3304 		free(dslist);
3305 	} else if (argc == 0) {
3306 		struct mnttab entry;
3307 
3308 		if ((op == OP_SHARE) || (options != NULL)) {
3309 			(void) fprintf(stderr, gettext("missing filesystem "
3310 			    "argument (specify -a for all)\n"));
3311 			usage(B_FALSE);
3312 		}
3313 
3314 		/*
3315 		 * When mount is given no arguments, go through /etc/mnttab and
3316 		 * display any active ZFS mounts.  We hide any snapshots, since
3317 		 * they are controlled automatically.
3318 		 */
3319 		rewind(mnttab_file);
3320 		while (getmntent(mnttab_file, &entry) == 0) {
3321 			if (strcmp(entry.mnt_fstype, MNTTYPE_ZFS) != 0 ||
3322 			    strchr(entry.mnt_special, '@') != NULL)
3323 				continue;
3324 
3325 			(void) printf("%-30s  %s\n", entry.mnt_special,
3326 			    entry.mnt_mountp);
3327 		}
3328 
3329 	} else {
3330 		zfs_handle_t *zhp;
3331 
3332 		types = ZFS_TYPE_FILESYSTEM;
3333 		if (op == OP_SHARE)
3334 			types |= ZFS_TYPE_VOLUME;
3335 
3336 		if (argc > 1) {
3337 			(void) fprintf(stderr,
3338 			    gettext("too many arguments\n"));
3339 			usage(B_FALSE);
3340 		}
3341 
3342 		if ((zhp = zfs_open(g_zfs, argv[0], types)) == NULL) {
3343 			ret = 1;
3344 		} else {
3345 			ret = share_mount_one(zhp, op, flags, NULL, B_TRUE,
3346 			    options);
3347 			zfs_close(zhp);
3348 		}
3349 	}
3350 
3351 	return (ret);
3352 }
3353 
3354 /*
3355  * zfs mount -a [nfs | iscsi]
3356  * zfs mount filesystem
3357  *
3358  * Mount all filesystems, or mount the given filesystem.
3359  */
3360 static int
3361 zfs_do_mount(int argc, char **argv)
3362 {
3363 	return (share_mount(OP_MOUNT, argc, argv));
3364 }
3365 
3366 /*
3367  * zfs share -a [nfs | iscsi | smb]
3368  * zfs share filesystem
3369  *
3370  * Share all filesystems, or share the given filesystem.
3371  */
3372 static int
3373 zfs_do_share(int argc, char **argv)
3374 {
3375 	return (share_mount(OP_SHARE, argc, argv));
3376 }
3377 
3378 typedef struct unshare_unmount_node {
3379 	zfs_handle_t	*un_zhp;
3380 	char		*un_mountp;
3381 	uu_avl_node_t	un_avlnode;
3382 } unshare_unmount_node_t;
3383 
3384 /* ARGSUSED */
3385 static int
3386 unshare_unmount_compare(const void *larg, const void *rarg, void *unused)
3387 {
3388 	const unshare_unmount_node_t *l = larg;
3389 	const unshare_unmount_node_t *r = rarg;
3390 
3391 	return (strcmp(l->un_mountp, r->un_mountp));
3392 }
3393 
3394 /*
3395  * Convenience routine used by zfs_do_umount() and manual_unmount().  Given an
3396  * absolute path, find the entry /etc/mnttab, verify that its a ZFS filesystem,
3397  * and unmount it appropriately.
3398  */
3399 static int
3400 unshare_unmount_path(int op, char *path, int flags, boolean_t is_manual)
3401 {
3402 	zfs_handle_t *zhp;
3403 	int ret;
3404 	struct stat64 statbuf;
3405 	struct extmnttab entry;
3406 	const char *cmdname = (op == OP_SHARE) ? "unshare" : "unmount";
3407 	ino_t path_inode;
3408 
3409 	/*
3410 	 * Search for the path in /etc/mnttab.  Rather than looking for the
3411 	 * specific path, which can be fooled by non-standard paths (i.e. ".."
3412 	 * or "//"), we stat() the path and search for the corresponding
3413 	 * (major,minor) device pair.
3414 	 */
3415 	if (stat64(path, &statbuf) != 0) {
3416 		(void) fprintf(stderr, gettext("cannot %s '%s': %s\n"),
3417 		    cmdname, path, strerror(errno));
3418 		return (1);
3419 	}
3420 	path_inode = statbuf.st_ino;
3421 
3422 	/*
3423 	 * Search for the given (major,minor) pair in the mount table.
3424 	 */
3425 	rewind(mnttab_file);
3426 	while ((ret = getextmntent(mnttab_file, &entry, 0)) == 0) {
3427 		if (entry.mnt_major == major(statbuf.st_dev) &&
3428 		    entry.mnt_minor == minor(statbuf.st_dev))
3429 			break;
3430 	}
3431 	if (ret != 0) {
3432 		if (op == OP_SHARE) {
3433 			(void) fprintf(stderr, gettext("cannot %s '%s': not "
3434 			    "currently mounted\n"), cmdname, path);
3435 			return (1);
3436 		}
3437 		(void) fprintf(stderr, gettext("warning: %s not in mnttab\n"),
3438 		    path);
3439 		if ((ret = umount2(path, flags)) != 0)
3440 			(void) fprintf(stderr, gettext("%s: %s\n"), path,
3441 			    strerror(errno));
3442 		return (ret != 0);
3443 	}
3444 
3445 	if (strcmp(entry.mnt_fstype, MNTTYPE_ZFS) != 0) {
3446 		(void) fprintf(stderr, gettext("cannot %s '%s': not a ZFS "
3447 		    "filesystem\n"), cmdname, path);
3448 		return (1);
3449 	}
3450 
3451 	if ((zhp = zfs_open(g_zfs, entry.mnt_special,
3452 	    ZFS_TYPE_FILESYSTEM)) == NULL)
3453 		return (1);
3454 
3455 	ret = 1;
3456 	if (stat64(entry.mnt_mountp, &statbuf) != 0) {
3457 		(void) fprintf(stderr, gettext("cannot %s '%s': %s\n"),
3458 		    cmdname, path, strerror(errno));
3459 		goto out;
3460 	} else if (statbuf.st_ino != path_inode) {
3461 		(void) fprintf(stderr, gettext("cannot "
3462 		    "%s '%s': not a mountpoint\n"), cmdname, path);
3463 		goto out;
3464 	}
3465 
3466 	if (op == OP_SHARE) {
3467 		char nfs_mnt_prop[ZFS_MAXPROPLEN];
3468 		char smbshare_prop[ZFS_MAXPROPLEN];
3469 
3470 		verify(zfs_prop_get(zhp, ZFS_PROP_SHARENFS, nfs_mnt_prop,
3471 		    sizeof (nfs_mnt_prop), NULL, NULL, 0, B_FALSE) == 0);
3472 		verify(zfs_prop_get(zhp, ZFS_PROP_SHARESMB, smbshare_prop,
3473 		    sizeof (smbshare_prop), NULL, NULL, 0, B_FALSE) == 0);
3474 
3475 		if (strcmp(nfs_mnt_prop, "off") == 0 &&
3476 		    strcmp(smbshare_prop, "off") == 0) {
3477 			(void) fprintf(stderr, gettext("cannot unshare "
3478 			    "'%s': legacy share\n"), path);
3479 			(void) fprintf(stderr, gettext("use "
3480 			    "unshare(1M) to unshare this filesystem\n"));
3481 		} else if (!zfs_is_shared(zhp)) {
3482 			(void) fprintf(stderr, gettext("cannot unshare '%s': "
3483 			    "not currently shared\n"), path);
3484 		} else {
3485 			ret = zfs_unshareall_bypath(zhp, path);
3486 		}
3487 	} else {
3488 		char mtpt_prop[ZFS_MAXPROPLEN];
3489 
3490 		verify(zfs_prop_get(zhp, ZFS_PROP_MOUNTPOINT, mtpt_prop,
3491 		    sizeof (mtpt_prop), NULL, NULL, 0, B_FALSE) == 0);
3492 
3493 		if (is_manual) {
3494 			ret = zfs_unmount(zhp, NULL, flags);
3495 		} else if (strcmp(mtpt_prop, "legacy") == 0) {
3496 			(void) fprintf(stderr, gettext("cannot unmount "
3497 			    "'%s': legacy mountpoint\n"),
3498 			    zfs_get_name(zhp));
3499 			(void) fprintf(stderr, gettext("use umount(1M) "
3500 			    "to unmount this filesystem\n"));
3501 		} else {
3502 			ret = zfs_unmountall(zhp, flags);
3503 		}
3504 	}
3505 
3506 out:
3507 	zfs_close(zhp);
3508 
3509 	return (ret != 0);
3510 }
3511 
3512 /*
3513  * Generic callback for unsharing or unmounting a filesystem.
3514  */
3515 static int
3516 unshare_unmount(int op, int argc, char **argv)
3517 {
3518 	int do_all = 0;
3519 	int flags = 0;
3520 	int ret = 0;
3521 	int types, c;
3522 	zfs_handle_t *zhp;
3523 	char nfsiscsi_mnt_prop[ZFS_MAXPROPLEN];
3524 	char sharesmb[ZFS_MAXPROPLEN];
3525 
3526 	/* check options */
3527 	while ((c = getopt(argc, argv, op == OP_SHARE ? "a" : "af")) != -1) {
3528 		switch (c) {
3529 		case 'a':
3530 			do_all = 1;
3531 			break;
3532 		case 'f':
3533 			flags = MS_FORCE;
3534 			break;
3535 		case '?':
3536 			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
3537 			    optopt);
3538 			usage(B_FALSE);
3539 		}
3540 	}
3541 
3542 	argc -= optind;
3543 	argv += optind;
3544 
3545 	if (do_all) {
3546 		/*
3547 		 * We could make use of zfs_for_each() to walk all datasets in
3548 		 * the system, but this would be very inefficient, especially
3549 		 * since we would have to linearly search /etc/mnttab for each
3550 		 * one.  Instead, do one pass through /etc/mnttab looking for
3551 		 * zfs entries and call zfs_unmount() for each one.
3552 		 *
3553 		 * Things get a little tricky if the administrator has created
3554 		 * mountpoints beneath other ZFS filesystems.  In this case, we
3555 		 * have to unmount the deepest filesystems first.  To accomplish
3556 		 * this, we place all the mountpoints in an AVL tree sorted by
3557 		 * the special type (dataset name), and walk the result in
3558 		 * reverse to make sure to get any snapshots first.
3559 		 */
3560 		struct mnttab entry;
3561 		uu_avl_pool_t *pool;
3562 		uu_avl_t *tree;
3563 		unshare_unmount_node_t *node;
3564 		uu_avl_index_t idx;
3565 		uu_avl_walk_t *walk;
3566 
3567 		if (argc != 0) {
3568 			(void) fprintf(stderr, gettext("too many arguments\n"));
3569 			usage(B_FALSE);
3570 		}
3571 
3572 		if ((pool = uu_avl_pool_create("unmount_pool",
3573 		    sizeof (unshare_unmount_node_t),
3574 		    offsetof(unshare_unmount_node_t, un_avlnode),
3575 		    unshare_unmount_compare,
3576 		    UU_DEFAULT)) == NULL) {
3577 			(void) fprintf(stderr, gettext("internal error: "
3578 			    "out of memory\n"));
3579 			exit(1);
3580 		}
3581 
3582 		if ((tree = uu_avl_create(pool, NULL, UU_DEFAULT)) == NULL) {
3583 			(void) fprintf(stderr, gettext("internal error: "
3584 			    "out of memory\n"));
3585 			exit(1);
3586 		}
3587 
3588 		rewind(mnttab_file);
3589 		while (getmntent(mnttab_file, &entry) == 0) {
3590 
3591 			/* ignore non-ZFS entries */
3592 			if (strcmp(entry.mnt_fstype, MNTTYPE_ZFS) != 0)
3593 				continue;
3594 
3595 			/* ignore snapshots */
3596 			if (strchr(entry.mnt_special, '@') != NULL)
3597 				continue;
3598 
3599 			if ((zhp = zfs_open(g_zfs, entry.mnt_special,
3600 			    ZFS_TYPE_FILESYSTEM)) == NULL) {
3601 				ret = 1;
3602 				continue;
3603 			}
3604 
3605 			switch (op) {
3606 			case OP_SHARE:
3607 				verify(zfs_prop_get(zhp, ZFS_PROP_SHARENFS,
3608 				    nfsiscsi_mnt_prop,
3609 				    sizeof (nfsiscsi_mnt_prop),
3610 				    NULL, NULL, 0, B_FALSE) == 0);
3611 				if (strcmp(nfsiscsi_mnt_prop, "off") != 0)
3612 					break;
3613 				verify(zfs_prop_get(zhp, ZFS_PROP_SHARESMB,
3614 				    nfsiscsi_mnt_prop,
3615 				    sizeof (nfsiscsi_mnt_prop),
3616 				    NULL, NULL, 0, B_FALSE) == 0);
3617 				if (strcmp(nfsiscsi_mnt_prop, "off") == 0)
3618 					continue;
3619 				break;
3620 			case OP_MOUNT:
3621 				/* Ignore legacy mounts */
3622 				verify(zfs_prop_get(zhp, ZFS_PROP_MOUNTPOINT,
3623 				    nfsiscsi_mnt_prop,
3624 				    sizeof (nfsiscsi_mnt_prop),
3625 				    NULL, NULL, 0, B_FALSE) == 0);
3626 				if (strcmp(nfsiscsi_mnt_prop, "legacy") == 0)
3627 					continue;
3628 				/* Ignore canmount=noauto mounts */
3629 				if (zfs_prop_get_int(zhp, ZFS_PROP_CANMOUNT) ==
3630 				    ZFS_CANMOUNT_NOAUTO)
3631 					continue;
3632 			default:
3633 				break;
3634 			}
3635 
3636 			node = safe_malloc(sizeof (unshare_unmount_node_t));
3637 			node->un_zhp = zhp;
3638 
3639 			if ((node->un_mountp = strdup(entry.mnt_mountp)) ==
3640 			    NULL) {
3641 				(void) fprintf(stderr, gettext("internal error:"
3642 				    " out of memory\n"));
3643 				exit(1);
3644 			}
3645 
3646 			uu_avl_node_init(node, &node->un_avlnode, pool);
3647 
3648 			if (uu_avl_find(tree, node, NULL, &idx) == NULL) {
3649 				uu_avl_insert(tree, node, idx);
3650 			} else {
3651 				zfs_close(node->un_zhp);
3652 				free(node->un_mountp);
3653 				free(node);
3654 			}
3655 		}
3656 
3657 		/*
3658 		 * Walk the AVL tree in reverse, unmounting each filesystem and
3659 		 * removing it from the AVL tree in the process.
3660 		 */
3661 		if ((walk = uu_avl_walk_start(tree,
3662 		    UU_WALK_REVERSE | UU_WALK_ROBUST)) == NULL) {
3663 			(void) fprintf(stderr,
3664 			    gettext("internal error: out of memory"));
3665 			exit(1);
3666 		}
3667 
3668 		while ((node = uu_avl_walk_next(walk)) != NULL) {
3669 			uu_avl_remove(tree, node);
3670 
3671 			switch (op) {
3672 			case OP_SHARE:
3673 				if (zfs_unshareall_bypath(node->un_zhp,
3674 				    node->un_mountp) != 0)
3675 					ret = 1;
3676 				break;
3677 
3678 			case OP_MOUNT:
3679 				if (zfs_unmount(node->un_zhp,
3680 				    node->un_mountp, flags) != 0)
3681 					ret = 1;
3682 				break;
3683 			}
3684 
3685 			zfs_close(node->un_zhp);
3686 			free(node->un_mountp);
3687 			free(node);
3688 		}
3689 
3690 		uu_avl_walk_end(walk);
3691 		uu_avl_destroy(tree);
3692 		uu_avl_pool_destroy(pool);
3693 
3694 		if (op == OP_SHARE) {
3695 			/*
3696 			 * Finally, unshare any volumes shared via iSCSI.
3697 			 */
3698 			zfs_handle_t **dslist = NULL;
3699 			size_t i, count = 0;
3700 
3701 			get_all_datasets(ZFS_TYPE_VOLUME, &dslist, &count,
3702 			    B_FALSE);
3703 
3704 			if (count != 0) {
3705 				qsort(dslist, count, sizeof (void *),
3706 				    dataset_cmp);
3707 
3708 				for (i = 0; i < count; i++) {
3709 					if (zfs_unshare_iscsi(dslist[i]) != 0)
3710 						ret = 1;
3711 					zfs_close(dslist[i]);
3712 				}
3713 
3714 				free(dslist);
3715 			}
3716 		}
3717 	} else {
3718 		if (argc != 1) {
3719 			if (argc == 0)
3720 				(void) fprintf(stderr,
3721 				    gettext("missing filesystem argument\n"));
3722 			else
3723 				(void) fprintf(stderr,
3724 				    gettext("too many arguments\n"));
3725 			usage(B_FALSE);
3726 		}
3727 
3728 		/*
3729 		 * We have an argument, but it may be a full path or a ZFS
3730 		 * filesystem.  Pass full paths off to unmount_path() (shared by
3731 		 * manual_unmount), otherwise open the filesystem and pass to
3732 		 * zfs_unmount().
3733 		 */
3734 		if (argv[0][0] == '/')
3735 			return (unshare_unmount_path(op, argv[0],
3736 			    flags, B_FALSE));
3737 
3738 		types = ZFS_TYPE_FILESYSTEM;
3739 		if (op == OP_SHARE)
3740 			types |= ZFS_TYPE_VOLUME;
3741 
3742 		if ((zhp = zfs_open(g_zfs, argv[0], types)) == NULL)
3743 			return (1);
3744 
3745 		if (zfs_get_type(zhp) == ZFS_TYPE_FILESYSTEM) {
3746 			verify(zfs_prop_get(zhp, op == OP_SHARE ?
3747 			    ZFS_PROP_SHARENFS : ZFS_PROP_MOUNTPOINT,
3748 			    nfsiscsi_mnt_prop, sizeof (nfsiscsi_mnt_prop), NULL,
3749 			    NULL, 0, B_FALSE) == 0);
3750 
3751 			switch (op) {
3752 			case OP_SHARE:
3753 				verify(zfs_prop_get(zhp, ZFS_PROP_SHARENFS,
3754 				    nfsiscsi_mnt_prop,
3755 				    sizeof (nfsiscsi_mnt_prop),
3756 				    NULL, NULL, 0, B_FALSE) == 0);
3757 				verify(zfs_prop_get(zhp, ZFS_PROP_SHARESMB,
3758 				    sharesmb, sizeof (sharesmb), NULL, NULL,
3759 				    0, B_FALSE) == 0);
3760 
3761 				if (strcmp(nfsiscsi_mnt_prop, "off") == 0 &&
3762 				    strcmp(sharesmb, "off") == 0) {
3763 					(void) fprintf(stderr, gettext("cannot "
3764 					    "unshare '%s': legacy share\n"),
3765 					    zfs_get_name(zhp));
3766 					(void) fprintf(stderr, gettext("use "
3767 					    "unshare(1M) to unshare this "
3768 					    "filesystem\n"));
3769 					ret = 1;
3770 				} else if (!zfs_is_shared(zhp)) {
3771 					(void) fprintf(stderr, gettext("cannot "
3772 					    "unshare '%s': not currently "
3773 					    "shared\n"), zfs_get_name(zhp));
3774 					ret = 1;
3775 				} else if (zfs_unshareall(zhp) != 0) {
3776 					ret = 1;
3777 				}
3778 				break;
3779 
3780 			case OP_MOUNT:
3781 				if (strcmp(nfsiscsi_mnt_prop, "legacy") == 0) {
3782 					(void) fprintf(stderr, gettext("cannot "
3783 					    "unmount '%s': legacy "
3784 					    "mountpoint\n"), zfs_get_name(zhp));
3785 					(void) fprintf(stderr, gettext("use "
3786 					    "umount(1M) to unmount this "
3787 					    "filesystem\n"));
3788 					ret = 1;
3789 				} else if (!zfs_is_mounted(zhp, NULL)) {
3790 					(void) fprintf(stderr, gettext("cannot "
3791 					    "unmount '%s': not currently "
3792 					    "mounted\n"),
3793 					    zfs_get_name(zhp));
3794 					ret = 1;
3795 				} else if (zfs_unmountall(zhp, flags) != 0) {
3796 					ret = 1;
3797 				}
3798 				break;
3799 			}
3800 		} else {
3801 			assert(op == OP_SHARE);
3802 
3803 			verify(zfs_prop_get(zhp, ZFS_PROP_SHAREISCSI,
3804 			    nfsiscsi_mnt_prop, sizeof (nfsiscsi_mnt_prop),
3805 			    NULL, NULL, 0, B_FALSE) == 0);
3806 
3807 			if (strcmp(nfsiscsi_mnt_prop, "off") == 0) {
3808 				(void) fprintf(stderr, gettext("cannot unshare "
3809 				    "'%s': 'shareiscsi' property not set\n"),
3810 				    zfs_get_name(zhp));
3811 				(void) fprintf(stderr, gettext("set "
3812 				    "'shareiscsi' property or use "
3813 				    "iscsitadm(1M) to share this volume\n"));
3814 				ret = 1;
3815 			} else if (!zfs_is_shared_iscsi(zhp)) {
3816 				(void) fprintf(stderr, gettext("cannot "
3817 				    "unshare '%s': not currently shared\n"),
3818 				    zfs_get_name(zhp));
3819 				ret = 1;
3820 			} else if (zfs_unshare_iscsi(zhp) != 0) {
3821 				ret = 1;
3822 			}
3823 		}
3824 
3825 		zfs_close(zhp);
3826 	}
3827 
3828 	return (ret);
3829 }
3830 
3831 /*
3832  * zfs unmount -a
3833  * zfs unmount filesystem
3834  *
3835  * Unmount all filesystems, or a specific ZFS filesystem.
3836  */
3837 static int
3838 zfs_do_unmount(int argc, char **argv)
3839 {
3840 	return (unshare_unmount(OP_MOUNT, argc, argv));
3841 }
3842 
3843 /*
3844  * zfs unshare -a
3845  * zfs unshare filesystem
3846  *
3847  * Unshare all filesystems, or a specific ZFS filesystem.
3848  */
3849 static int
3850 zfs_do_unshare(int argc, char **argv)
3851 {
3852 	return (unshare_unmount(OP_SHARE, argc, argv));
3853 }
3854 
3855 /* ARGSUSED */
3856 static int
3857 zfs_do_python(int argc, char **argv)
3858 {
3859 	(void) execv(pypath, argv-1);
3860 	(void) printf("internal error: %s not found\n", pypath);
3861 	return (-1);
3862 }
3863 
3864 /*
3865  * Called when invoked as /etc/fs/zfs/mount.  Do the mount if the mountpoint is
3866  * 'legacy'.  Otherwise, complain that use should be using 'zfs mount'.
3867  */
3868 static int
3869 manual_mount(int argc, char **argv)
3870 {
3871 	zfs_handle_t *zhp;
3872 	char mountpoint[ZFS_MAXPROPLEN];
3873 	char mntopts[MNT_LINE_MAX] = { '\0' };
3874 	int ret;
3875 	int c;
3876 	int flags = 0;
3877 	char *dataset, *path;
3878 
3879 	/* check options */
3880 	while ((c = getopt(argc, argv, ":mo:O")) != -1) {
3881 		switch (c) {
3882 		case 'o':
3883 			(void) strlcpy(mntopts, optarg, sizeof (mntopts));
3884 			break;
3885 		case 'O':
3886 			flags |= MS_OVERLAY;
3887 			break;
3888 		case 'm':
3889 			flags |= MS_NOMNTTAB;
3890 			break;
3891 		case ':':
3892 			(void) fprintf(stderr, gettext("missing argument for "
3893 			    "'%c' option\n"), optopt);
3894 			usage(B_FALSE);
3895 			break;
3896 		case '?':
3897 			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
3898 			    optopt);
3899 			(void) fprintf(stderr, gettext("usage: mount [-o opts] "
3900 			    "<path>\n"));
3901 			return (2);
3902 		}
3903 	}
3904 
3905 	argc -= optind;
3906 	argv += optind;
3907 
3908 	/* check that we only have two arguments */
3909 	if (argc != 2) {
3910 		if (argc == 0)
3911 			(void) fprintf(stderr, gettext("missing dataset "
3912 			    "argument\n"));
3913 		else if (argc == 1)
3914 			(void) fprintf(stderr,
3915 			    gettext("missing mountpoint argument\n"));
3916 		else
3917 			(void) fprintf(stderr, gettext("too many arguments\n"));
3918 		(void) fprintf(stderr, "usage: mount <dataset> <mountpoint>\n");
3919 		return (2);
3920 	}
3921 
3922 	dataset = argv[0];
3923 	path = argv[1];
3924 
3925 	/* try to open the dataset */
3926 	if ((zhp = zfs_open(g_zfs, dataset, ZFS_TYPE_FILESYSTEM)) == NULL)
3927 		return (1);
3928 
3929 	(void) zfs_prop_get(zhp, ZFS_PROP_MOUNTPOINT, mountpoint,
3930 	    sizeof (mountpoint), NULL, NULL, 0, B_FALSE);
3931 
3932 	/* check for legacy mountpoint and complain appropriately */
3933 	ret = 0;
3934 	if (strcmp(mountpoint, ZFS_MOUNTPOINT_LEGACY) == 0) {
3935 		if (mount(dataset, path, MS_OPTIONSTR | flags, MNTTYPE_ZFS,
3936 		    NULL, 0, mntopts, sizeof (mntopts)) != 0) {
3937 			(void) fprintf(stderr, gettext("mount failed: %s\n"),
3938 			    strerror(errno));
3939 			ret = 1;
3940 		}
3941 	} else {
3942 		(void) fprintf(stderr, gettext("filesystem '%s' cannot be "
3943 		    "mounted using 'mount -F zfs'\n"), dataset);
3944 		(void) fprintf(stderr, gettext("Use 'zfs set mountpoint=%s' "
3945 		    "instead.\n"), path);
3946 		(void) fprintf(stderr, gettext("If you must use 'mount -F zfs' "
3947 		    "or /etc/vfstab, use 'zfs set mountpoint=legacy'.\n"));
3948 		(void) fprintf(stderr, gettext("See zfs(1M) for more "
3949 		    "information.\n"));
3950 		ret = 1;
3951 	}
3952 
3953 	return (ret);
3954 }
3955 
3956 /*
3957  * Called when invoked as /etc/fs/zfs/umount.  Unlike a manual mount, we allow
3958  * unmounts of non-legacy filesystems, as this is the dominant administrative
3959  * interface.
3960  */
3961 static int
3962 manual_unmount(int argc, char **argv)
3963 {
3964 	int flags = 0;
3965 	int c;
3966 
3967 	/* check options */
3968 	while ((c = getopt(argc, argv, "f")) != -1) {
3969 		switch (c) {
3970 		case 'f':
3971 			flags = MS_FORCE;
3972 			break;
3973 		case '?':
3974 			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
3975 			    optopt);
3976 			(void) fprintf(stderr, gettext("usage: unmount [-f] "
3977 			    "<path>\n"));
3978 			return (2);
3979 		}
3980 	}
3981 
3982 	argc -= optind;
3983 	argv += optind;
3984 
3985 	/* check arguments */
3986 	if (argc != 1) {
3987 		if (argc == 0)
3988 			(void) fprintf(stderr, gettext("missing path "
3989 			    "argument\n"));
3990 		else
3991 			(void) fprintf(stderr, gettext("too many arguments\n"));
3992 		(void) fprintf(stderr, gettext("usage: unmount [-f] <path>\n"));
3993 		return (2);
3994 	}
3995 
3996 	return (unshare_unmount_path(OP_MOUNT, argv[0], flags, B_TRUE));
3997 }
3998 
3999 static int
4000 find_command_idx(char *command, int *idx)
4001 {
4002 	int i;
4003 
4004 	for (i = 0; i < NCOMMAND; i++) {
4005 		if (command_table[i].name == NULL)
4006 			continue;
4007 
4008 		if (strcmp(command, command_table[i].name) == 0) {
4009 			*idx = i;
4010 			return (0);
4011 		}
4012 	}
4013 	return (1);
4014 }
4015 
4016 int
4017 main(int argc, char **argv)
4018 {
4019 	int ret;
4020 	int i;
4021 	char *progname;
4022 	char *cmdname;
4023 
4024 	(void) setlocale(LC_ALL, "");
4025 	(void) textdomain(TEXT_DOMAIN);
4026 
4027 	opterr = 0;
4028 
4029 	if ((g_zfs = libzfs_init()) == NULL) {
4030 		(void) fprintf(stderr, gettext("internal error: failed to "
4031 		    "initialize ZFS library\n"));
4032 		return (1);
4033 	}
4034 
4035 	zpool_set_history_str("zfs", argc, argv, history_str);
4036 	verify(zpool_stage_history(g_zfs, history_str) == 0);
4037 
4038 	libzfs_print_on_error(g_zfs, B_TRUE);
4039 
4040 	if ((mnttab_file = fopen(MNTTAB, "r")) == NULL) {
4041 		(void) fprintf(stderr, gettext("internal error: unable to "
4042 		    "open %s\n"), MNTTAB);
4043 		return (1);
4044 	}
4045 
4046 	/*
4047 	 * This command also doubles as the /etc/fs mount and unmount program.
4048 	 * Determine if we should take this behavior based on argv[0].
4049 	 */
4050 	progname = basename(argv[0]);
4051 	if (strcmp(progname, "mount") == 0) {
4052 		ret = manual_mount(argc, argv);
4053 	} else if (strcmp(progname, "umount") == 0) {
4054 		ret = manual_unmount(argc, argv);
4055 	} else {
4056 		/*
4057 		 * Make sure the user has specified some command.
4058 		 */
4059 		if (argc < 2) {
4060 			(void) fprintf(stderr, gettext("missing command\n"));
4061 			usage(B_FALSE);
4062 		}
4063 
4064 		cmdname = argv[1];
4065 
4066 		/*
4067 		 * The 'umount' command is an alias for 'unmount'
4068 		 */
4069 		if (strcmp(cmdname, "umount") == 0)
4070 			cmdname = "unmount";
4071 
4072 		/*
4073 		 * The 'recv' command is an alias for 'receive'
4074 		 */
4075 		if (strcmp(cmdname, "recv") == 0)
4076 			cmdname = "receive";
4077 
4078 		/*
4079 		 * Special case '-?'
4080 		 */
4081 		if (strcmp(cmdname, "-?") == 0)
4082 			usage(B_TRUE);
4083 
4084 		/*
4085 		 * Run the appropriate command.
4086 		 */
4087 		libzfs_mnttab_cache(g_zfs, B_TRUE);
4088 		if (find_command_idx(cmdname, &i) == 0) {
4089 			current_command = &command_table[i];
4090 			ret = command_table[i].func(argc - 1, argv + 1);
4091 		} else if (strchr(cmdname, '=') != NULL) {
4092 			verify(find_command_idx("set", &i) == 0);
4093 			current_command = &command_table[i];
4094 			ret = command_table[i].func(argc, argv);
4095 		} else {
4096 			(void) fprintf(stderr, gettext("unrecognized "
4097 			    "command '%s'\n"), cmdname);
4098 			usage(B_FALSE);
4099 		}
4100 		libzfs_mnttab_cache(g_zfs, B_FALSE);
4101 	}
4102 
4103 	(void) fclose(mnttab_file);
4104 
4105 	libzfs_fini(g_zfs);
4106 
4107 	/*
4108 	 * The 'ZFS_ABORT' environment variable causes us to dump core on exit
4109 	 * for the purposes of running ::findleaks.
4110 	 */
4111 	if (getenv("ZFS_ABORT") != NULL) {
4112 		(void) printf("dumping core by request\n");
4113 		abort();
4114 	}
4115 
4116 	return (ret);
4117 }
4118