xref: /titanic_52/usr/src/cmd/zfs/zfs_main.c (revision ae115bc77f6fcde83175c75b4206dc2e50747966)
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 2006 Sun Microsystems, Inc.  All rights reserved.
24  * Use is subject to license terms.
25  */
26 
27 #pragma ident	"%Z%%M%	%I%	%E% SMI"
28 
29 #include <assert.h>
30 #include <ctype.h>
31 #include <errno.h>
32 #include <libgen.h>
33 #include <libintl.h>
34 #include <libuutil.h>
35 #include <locale.h>
36 #include <stddef.h>
37 #include <stdio.h>
38 #include <stdlib.h>
39 #include <strings.h>
40 #include <unistd.h>
41 #include <fcntl.h>
42 #include <zone.h>
43 #include <sys/mkdev.h>
44 #include <sys/mntent.h>
45 #include <sys/mnttab.h>
46 #include <sys/mount.h>
47 #include <sys/stat.h>
48 
49 #include <libzfs.h>
50 
51 #include "zfs_iter.h"
52 #include "zfs_util.h"
53 
54 libzfs_handle_t *g_zfs;
55 
56 static FILE *mnttab_file;
57 
58 static int zfs_do_clone(int argc, char **argv);
59 static int zfs_do_create(int argc, char **argv);
60 static int zfs_do_destroy(int argc, char **argv);
61 static int zfs_do_get(int argc, char **argv);
62 static int zfs_do_inherit(int argc, char **argv);
63 static int zfs_do_list(int argc, char **argv);
64 static int zfs_do_mount(int argc, char **argv);
65 static int zfs_do_rename(int argc, char **argv);
66 static int zfs_do_rollback(int argc, char **argv);
67 static int zfs_do_set(int argc, char **argv);
68 static int zfs_do_snapshot(int argc, char **argv);
69 static int zfs_do_unmount(int argc, char **argv);
70 static int zfs_do_share(int argc, char **argv);
71 static int zfs_do_unshare(int argc, char **argv);
72 static int zfs_do_send(int argc, char **argv);
73 static int zfs_do_receive(int argc, char **argv);
74 static int zfs_do_promote(int argc, char **argv);
75 
76 /*
77  * These libumem hooks provide a reasonable set of defaults for the allocator's
78  * debugging facilities.
79  */
80 const char *
81 _umem_debug_init(void)
82 {
83 	return ("default,verbose"); /* $UMEM_DEBUG setting */
84 }
85 
86 const char *
87 _umem_logging_init(void)
88 {
89 	return ("fail,contents"); /* $UMEM_LOGGING setting */
90 }
91 
92 typedef enum {
93 	HELP_CLONE,
94 	HELP_CREATE,
95 	HELP_DESTROY,
96 	HELP_GET,
97 	HELP_INHERIT,
98 	HELP_LIST,
99 	HELP_MOUNT,
100 	HELP_PROMOTE,
101 	HELP_RECEIVE,
102 	HELP_RENAME,
103 	HELP_ROLLBACK,
104 	HELP_SEND,
105 	HELP_SET,
106 	HELP_SHARE,
107 	HELP_SNAPSHOT,
108 	HELP_UNMOUNT,
109 	HELP_UNSHARE
110 } zfs_help_t;
111 
112 typedef struct zfs_command {
113 	const char	*name;
114 	int		(*func)(int argc, char **argv);
115 	zfs_help_t	usage;
116 } zfs_command_t;
117 
118 /*
119  * Master command table.  Each ZFS command has a name, associated function, and
120  * usage message.  The usage messages need to be internationalized, so we have
121  * to have a function to return the usage message based on a command index.
122  *
123  * These commands are organized according to how they are displayed in the usage
124  * message.  An empty command (one with a NULL name) indicates an empty line in
125  * the generic usage message.
126  */
127 static zfs_command_t command_table[] = {
128 	{ "create",	zfs_do_create,		HELP_CREATE		},
129 	{ "destroy",	zfs_do_destroy,		HELP_DESTROY		},
130 	{ NULL },
131 	{ "snapshot",	zfs_do_snapshot,	HELP_SNAPSHOT		},
132 	{ "rollback",	zfs_do_rollback,	HELP_ROLLBACK		},
133 	{ "clone",	zfs_do_clone,		HELP_CLONE		},
134 	{ "promote",	zfs_do_promote,		HELP_PROMOTE		},
135 	{ "rename",	zfs_do_rename,		HELP_RENAME		},
136 	{ NULL },
137 	{ "list",	zfs_do_list,		HELP_LIST		},
138 	{ NULL },
139 	{ "set",	zfs_do_set,		HELP_SET		},
140 	{ "get", 	zfs_do_get,		HELP_GET		},
141 	{ "inherit",	zfs_do_inherit,		HELP_INHERIT		},
142 	{ NULL },
143 	{ "mount",	zfs_do_mount,		HELP_MOUNT		},
144 	{ NULL },
145 	{ "unmount",	zfs_do_unmount,		HELP_UNMOUNT		},
146 	{ NULL },
147 	{ "share",	zfs_do_share,		HELP_SHARE		},
148 	{ NULL },
149 	{ "unshare",	zfs_do_unshare,		HELP_UNSHARE		},
150 	{ NULL },
151 	{ "send",	zfs_do_send,		HELP_SEND		},
152 	{ "receive",	zfs_do_receive,		HELP_RECEIVE		},
153 };
154 
155 #define	NCOMMAND	(sizeof (command_table) / sizeof (command_table[0]))
156 
157 zfs_command_t *current_command;
158 
159 static const char *
160 get_usage(zfs_help_t idx)
161 {
162 	switch (idx) {
163 	case HELP_CLONE:
164 		return (gettext("\tclone <snapshot> <filesystem|volume>\n"));
165 	case HELP_CREATE:
166 		return (gettext("\tcreate [[-o property=value] ... ] "
167 		    "<filesystem>\n"
168 		    "\tcreate [-s] [-b blocksize] [[-o property=value] ...]\n"
169 		    "\t    -V <size> <volume>\n"));
170 	case HELP_DESTROY:
171 		return (gettext("\tdestroy [-rRf] "
172 		    "<filesystem|volume|snapshot>\n"));
173 	case HELP_GET:
174 		return (gettext("\tget [-rHp] [-o field[,field]...] "
175 		    "[-s source[,source]...]\n"
176 		    "\t    <all | property[,property]...> "
177 		    "[filesystem|volume|snapshot] ...\n"));
178 	case HELP_INHERIT:
179 		return (gettext("\tinherit [-r] <property> "
180 		    "<filesystem|volume> ...\n"));
181 	case HELP_LIST:
182 		return (gettext("\tlist [-rH] [-o property[,property]...] "
183 		    "[-t type[,type]...]\n"
184 		    "\t    [-s property [-s property]...]"
185 		    " [-S property [-S property]...]\n"
186 		    "\t    [filesystem|volume|snapshot] ...\n"));
187 	case HELP_MOUNT:
188 		return (gettext("\tmount\n"
189 		    "\tmount [-o opts] [-O] -a\n"
190 		    "\tmount [-o opts] [-O] <filesystem>\n"));
191 	case HELP_PROMOTE:
192 		return (gettext("\tpromote <clone filesystem>\n"));
193 	case HELP_RECEIVE:
194 		return (gettext("\treceive [-vnF] <filesystem|volume|"
195 		"snapshot>\n"
196 		"\treceive [-vnF] -d <filesystem>\n"));
197 	case HELP_RENAME:
198 		return (gettext("\trename <filesystem|volume|snapshot> "
199 		    "<filesystem|volume|snapshot>\n"));
200 	case HELP_ROLLBACK:
201 		return (gettext("\trollback [-rRf] <snapshot>\n"));
202 	case HELP_SEND:
203 		return (gettext("\tsend [-i <snapshot>] <snapshot>\n"));
204 	case HELP_SET:
205 		return (gettext("\tset <property=value> "
206 		    "<filesystem|volume> ...\n"));
207 	case HELP_SHARE:
208 		return (gettext("\tshare -a\n"
209 		    "\tshare <filesystem>\n"));
210 	case HELP_SNAPSHOT:
211 		return (gettext("\tsnapshot [-r] "
212 		    "<filesystem@name|volume@name>\n"));
213 	case HELP_UNMOUNT:
214 		return (gettext("\tunmount [-f] -a\n"
215 		    "\tunmount [-f] <filesystem|mountpoint>\n"));
216 	case HELP_UNSHARE:
217 		return (gettext("\tunshare [-f] -a\n"
218 		    "\tunshare [-f] <filesystem|mountpoint>\n"));
219 	}
220 
221 	abort();
222 	/* NOTREACHED */
223 }
224 
225 /*
226  * Utility function to guarantee malloc() success.
227  */
228 void *
229 safe_malloc(size_t size)
230 {
231 	void *data;
232 
233 	if ((data = calloc(1, size)) == NULL) {
234 		(void) fprintf(stderr, "internal error: out of memory\n");
235 		exit(1);
236 	}
237 
238 	return (data);
239 }
240 
241 /*
242  * Display usage message.  If we're inside a command, display only the usage for
243  * that command.  Otherwise, iterate over the entire command table and display
244  * a complete usage message.
245  */
246 static void
247 usage(boolean_t requested)
248 {
249 	int i;
250 	boolean_t show_properties = B_FALSE;
251 	FILE *fp = requested ? stdout : stderr;
252 
253 	if (current_command == NULL) {
254 
255 		(void) fprintf(fp, gettext("usage: zfs command args ...\n"));
256 		(void) fprintf(fp,
257 		    gettext("where 'command' is one of the following:\n\n"));
258 
259 		for (i = 0; i < NCOMMAND; i++) {
260 			if (command_table[i].name == NULL)
261 				(void) fprintf(fp, "\n");
262 			else
263 				(void) fprintf(fp, "%s",
264 				    get_usage(command_table[i].usage));
265 		}
266 
267 		(void) fprintf(fp, gettext("\nEach dataset is of the form: "
268 		    "pool/[dataset/]*dataset[@name]\n"));
269 	} else {
270 		(void) fprintf(fp, gettext("usage:\n"));
271 		(void) fprintf(fp, "%s", get_usage(current_command->usage));
272 	}
273 
274 	if (current_command != NULL &&
275 	    (strcmp(current_command->name, "set") == 0 ||
276 	    strcmp(current_command->name, "get") == 0 ||
277 	    strcmp(current_command->name, "inherit") == 0 ||
278 	    strcmp(current_command->name, "list") == 0))
279 		show_properties = B_TRUE;
280 
281 	if (show_properties) {
282 
283 		(void) fprintf(fp,
284 		    gettext("\nThe following properties are supported:\n"));
285 
286 		(void) fprintf(fp, "\n\t%-13s  %s  %s   %s\n\n",
287 		    "PROPERTY", "EDIT", "INHERIT", "VALUES");
288 
289 		for (i = 0; i < ZFS_NPROP_VISIBLE; i++) {
290 			(void) fprintf(fp, "\t%-13s  ", zfs_prop_to_name(i));
291 
292 			if (zfs_prop_readonly(i))
293 				(void) fprintf(fp, "  NO    ");
294 			else
295 				(void) fprintf(fp, " YES    ");
296 
297 			if (zfs_prop_inheritable(i))
298 				(void) fprintf(fp, "  YES   ");
299 			else
300 				(void) fprintf(fp, "   NO   ");
301 
302 			if (zfs_prop_values(i) == NULL)
303 				(void) fprintf(fp, "-\n");
304 			else
305 				(void) fprintf(fp, "%s\n", zfs_prop_values(i));
306 		}
307 		(void) fprintf(fp, gettext("\nSizes are specified in bytes "
308 		    "with standard units such as K, M, G, etc.\n"));
309 		(void) fprintf(fp, gettext("\n\nUser-defined properties can "
310 		    "be specified by using a name containing a colon (:).\n"));
311 	} else {
312 		/*
313 		 * TRANSLATION NOTE:
314 		 * "zfs set|get" must not be localised this is the
315 		 * command name and arguments.
316 		 */
317 		(void) fprintf(fp,
318 		    gettext("\nFor the property list, run: zfs set|get\n"));
319 	}
320 
321 	/*
322 	 * See comments at end of main().
323 	 */
324 	if (getenv("ZFS_ABORT") != NULL) {
325 		(void) printf("dumping core by request\n");
326 		abort();
327 	}
328 
329 	exit(requested ? 0 : 2);
330 }
331 
332 /*
333  * zfs clone <fs, snap, vol> fs
334  *
335  * Given an existing dataset, create a writable copy whose initial contents
336  * are the same as the source.  The newly created dataset maintains a
337  * dependency on the original; the original cannot be destroyed so long as
338  * the clone exists.
339  */
340 static int
341 zfs_do_clone(int argc, char **argv)
342 {
343 	zfs_handle_t *zhp;
344 	int ret;
345 
346 	/* check options */
347 	if (argc > 1 && argv[1][0] == '-') {
348 		(void) fprintf(stderr, gettext("invalid option '%c'\n"),
349 		    argv[1][1]);
350 		usage(B_FALSE);
351 	}
352 
353 	/* check number of arguments */
354 	if (argc < 2) {
355 		(void) fprintf(stderr, gettext("missing source dataset "
356 		    "argument\n"));
357 		usage(B_FALSE);
358 	}
359 	if (argc < 3) {
360 		(void) fprintf(stderr, gettext("missing target dataset "
361 		    "argument\n"));
362 		usage(B_FALSE);
363 	}
364 	if (argc > 3) {
365 		(void) fprintf(stderr, gettext("too many arguments\n"));
366 		usage(B_FALSE);
367 	}
368 
369 	/* open the source dataset */
370 	if ((zhp = zfs_open(g_zfs, argv[1], ZFS_TYPE_SNAPSHOT)) == NULL)
371 		return (1);
372 
373 	/* pass to libzfs */
374 	ret = zfs_clone(zhp, argv[2], NULL);
375 
376 	/* create the mountpoint if necessary */
377 	if (ret == 0) {
378 		zfs_handle_t *clone = zfs_open(g_zfs, argv[2], ZFS_TYPE_ANY);
379 		if (clone != NULL) {
380 			if ((ret = zfs_mount(clone, NULL, 0)) == 0)
381 				ret = zfs_share(clone);
382 			zfs_close(clone);
383 		}
384 		zpool_log_history(g_zfs, argc, argv, argv[2], B_FALSE, B_FALSE);
385 	}
386 
387 	zfs_close(zhp);
388 
389 	return (ret == 0 ? 0 : 1);
390 }
391 
392 /*
393  * zfs create [-o prop=value] ... fs
394  * zfs create [-s] [-b blocksize] [-o prop=value] ... -V vol size
395  *
396  * Create a new dataset.  This command can be used to create filesystems
397  * and volumes.  Snapshot creation is handled by 'zfs snapshot'.
398  * For volumes, the user must specify a size to be used.
399  *
400  * The '-s' flag applies only to volumes, and indicates that we should not try
401  * to set the reservation for this volume.  By default we set a reservation
402  * equal to the size for any volume.
403  */
404 static int
405 zfs_do_create(int argc, char **argv)
406 {
407 	zfs_type_t type = ZFS_TYPE_FILESYSTEM;
408 	zfs_handle_t *zhp = NULL;
409 	uint64_t volsize;
410 	int c;
411 	boolean_t noreserve = B_FALSE;
412 	int ret = 1;
413 	nvlist_t *props = NULL;
414 	uint64_t intval;
415 	char *propname;
416 	char *propval = NULL;
417 	char *strval;
418 
419 	if (nvlist_alloc(&props, NV_UNIQUE_NAME, 0) != 0) {
420 		(void) fprintf(stderr, gettext("internal error: "
421 		    "out of memory\n"));
422 		return (1);
423 	}
424 
425 	/* check options */
426 	while ((c = getopt(argc, argv, ":V:b:so:")) != -1) {
427 		switch (c) {
428 		case 'V':
429 			type = ZFS_TYPE_VOLUME;
430 			if (zfs_nicestrtonum(g_zfs, optarg, &intval) != 0) {
431 				(void) fprintf(stderr, gettext("bad volume "
432 				    "size '%s': %s\n"), optarg,
433 				    libzfs_error_description(g_zfs));
434 				goto error;
435 			}
436 
437 			if (nvlist_add_uint64(props,
438 			    zfs_prop_to_name(ZFS_PROP_VOLSIZE),
439 			    intval) != 0) {
440 				(void) fprintf(stderr, gettext("internal "
441 				    "error: out of memory\n"));
442 				goto error;
443 			}
444 			volsize = intval;
445 			break;
446 		case 'b':
447 			if (zfs_nicestrtonum(g_zfs, optarg, &intval) != 0) {
448 				(void) fprintf(stderr, gettext("bad volume "
449 				    "block size '%s': %s\n"), optarg,
450 				    libzfs_error_description(g_zfs));
451 				goto error;
452 			}
453 
454 			if (nvlist_add_uint64(props,
455 			    zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE),
456 			    intval) != 0) {
457 				(void) fprintf(stderr, gettext("internal "
458 				    "error: out of memory\n"));
459 				goto error;
460 			}
461 			break;
462 		case 'o':
463 			propname = optarg;
464 			if ((propval = strchr(propname, '=')) == NULL) {
465 				(void) fprintf(stderr, gettext("missing "
466 				    "'=' for -o option\n"));
467 				goto error;
468 			}
469 			*propval = '\0';
470 			propval++;
471 			if (nvlist_lookup_string(props, propname,
472 			    &strval) == 0) {
473 				(void) fprintf(stderr, gettext("property '%s' "
474 				    "specified multiple times\n"), propname);
475 				goto error;
476 			}
477 			if (nvlist_add_string(props, propname, propval) != 0) {
478 				(void) fprintf(stderr, gettext("internal "
479 				    "error: out of memory\n"));
480 				goto error;
481 			}
482 			break;
483 		case 's':
484 			noreserve = B_TRUE;
485 			break;
486 		case ':':
487 			(void) fprintf(stderr, gettext("missing size "
488 			    "argument\n"));
489 			goto badusage;
490 			break;
491 		case '?':
492 			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
493 			    optopt);
494 			goto badusage;
495 		}
496 	}
497 
498 	if (noreserve && type != ZFS_TYPE_VOLUME) {
499 		(void) fprintf(stderr, gettext("'-s' can only be used when "
500 		    "creating a volume\n"));
501 		goto badusage;
502 	}
503 
504 	argc -= optind;
505 	argv += optind;
506 
507 	/* check number of arguments */
508 	if (argc == 0) {
509 		(void) fprintf(stderr, gettext("missing %s argument\n"),
510 		    zfs_type_to_name(type));
511 		goto badusage;
512 	}
513 	if (argc > 1) {
514 		(void) fprintf(stderr, gettext("too many arguments\n"));
515 		goto badusage;
516 	}
517 
518 	if (type == ZFS_TYPE_VOLUME && !noreserve &&
519 	    nvlist_lookup_string(props, zfs_prop_to_name(ZFS_PROP_RESERVATION),
520 	    &strval) != 0) {
521 		if (nvlist_add_uint64(props,
522 		    zfs_prop_to_name(ZFS_PROP_RESERVATION),
523 		    volsize) != 0) {
524 			(void) fprintf(stderr, gettext("internal "
525 			    "error: out of memory\n"));
526 			nvlist_free(props);
527 			return (1);
528 		}
529 	}
530 
531 	/* pass to libzfs */
532 	if (zfs_create(g_zfs, argv[0], type, props) != 0)
533 		goto error;
534 
535 	if (propval != NULL)
536 		*(propval - 1) = '=';
537 	zpool_log_history(g_zfs, argc + optind, argv - optind, argv[0],
538 	    B_FALSE, B_FALSE);
539 
540 	if ((zhp = zfs_open(g_zfs, argv[0], ZFS_TYPE_ANY)) == NULL)
541 		goto error;
542 
543 	/*
544 	 * Mount and/or share the new filesystem as appropriate.  We provide a
545 	 * verbose error message to let the user know that their filesystem was
546 	 * in fact created, even if we failed to mount or share it.
547 	 */
548 	if (zfs_mount(zhp, NULL, 0) != 0) {
549 		(void) fprintf(stderr, gettext("filesystem successfully "
550 		    "created, but not mounted\n"));
551 		ret = 1;
552 	} else if (zfs_share(zhp) != 0) {
553 		(void) fprintf(stderr, gettext("filesystem successfully "
554 		    "created, but not shared\n"));
555 		ret = 1;
556 	} else {
557 		ret = 0;
558 	}
559 
560 error:
561 	if (zhp)
562 		zfs_close(zhp);
563 	nvlist_free(props);
564 	return (ret);
565 badusage:
566 	nvlist_free(props);
567 	usage(B_FALSE);
568 	return (2);
569 }
570 
571 /*
572  * zfs destroy [-rf] <fs, snap, vol>
573  *
574  * 	-r	Recursively destroy all children
575  * 	-R	Recursively destroy all dependents, including clones
576  * 	-f	Force unmounting of any dependents
577  *
578  * Destroys the given dataset.  By default, it will unmount any filesystems,
579  * and refuse to destroy a dataset that has any dependents.  A dependent can
580  * either be a child, or a clone of a child.
581  */
582 typedef struct destroy_cbdata {
583 	boolean_t	cb_first;
584 	int		cb_force;
585 	int		cb_recurse;
586 	int		cb_error;
587 	int		cb_needforce;
588 	int		cb_doclones;
589 	boolean_t	cb_closezhp;
590 	zfs_handle_t	*cb_target;
591 	char		*cb_snapname;
592 } destroy_cbdata_t;
593 
594 /*
595  * Check for any dependents based on the '-r' or '-R' flags.
596  */
597 static int
598 destroy_check_dependent(zfs_handle_t *zhp, void *data)
599 {
600 	destroy_cbdata_t *cbp = data;
601 	const char *tname = zfs_get_name(cbp->cb_target);
602 	const char *name = zfs_get_name(zhp);
603 
604 	if (strncmp(tname, name, strlen(tname)) == 0 &&
605 	    (name[strlen(tname)] == '/' || name[strlen(tname)] == '@')) {
606 		/*
607 		 * This is a direct descendant, not a clone somewhere else in
608 		 * the hierarchy.
609 		 */
610 		if (cbp->cb_recurse)
611 			goto out;
612 
613 		if (cbp->cb_first) {
614 			(void) fprintf(stderr, gettext("cannot destroy '%s': "
615 			    "%s has children\n"),
616 			    zfs_get_name(cbp->cb_target),
617 			    zfs_type_to_name(zfs_get_type(cbp->cb_target)));
618 			(void) fprintf(stderr, gettext("use '-r' to destroy "
619 			    "the following datasets:\n"));
620 			cbp->cb_first = B_FALSE;
621 			cbp->cb_error = 1;
622 		}
623 
624 		(void) fprintf(stderr, "%s\n", zfs_get_name(zhp));
625 	} else {
626 		/*
627 		 * This is a clone.  We only want to report this if the '-r'
628 		 * wasn't specified, or the target is a snapshot.
629 		 */
630 		if (!cbp->cb_recurse &&
631 		    zfs_get_type(cbp->cb_target) != ZFS_TYPE_SNAPSHOT)
632 			goto out;
633 
634 		if (cbp->cb_first) {
635 			(void) fprintf(stderr, gettext("cannot destroy '%s': "
636 			    "%s has dependent clones\n"),
637 			    zfs_get_name(cbp->cb_target),
638 			    zfs_type_to_name(zfs_get_type(cbp->cb_target)));
639 			(void) fprintf(stderr, gettext("use '-R' to destroy "
640 			    "the following datasets:\n"));
641 			cbp->cb_first = B_FALSE;
642 			cbp->cb_error = 1;
643 		}
644 
645 		(void) fprintf(stderr, "%s\n", zfs_get_name(zhp));
646 	}
647 
648 out:
649 	zfs_close(zhp);
650 	return (0);
651 }
652 
653 static int
654 destroy_callback(zfs_handle_t *zhp, void *data)
655 {
656 	destroy_cbdata_t *cbp = data;
657 
658 	/*
659 	 * Ignore pools (which we've already flagged as an error before getting
660 	 * here.
661 	 */
662 	if (strchr(zfs_get_name(zhp), '/') == NULL &&
663 	    zfs_get_type(zhp) == ZFS_TYPE_FILESYSTEM) {
664 		zfs_close(zhp);
665 		return (0);
666 	}
667 
668 	/*
669 	 * Bail out on the first error.
670 	 */
671 	if (zfs_unmount(zhp, NULL, cbp->cb_force ? MS_FORCE : 0) != 0 ||
672 	    zfs_destroy(zhp) != 0) {
673 		zfs_close(zhp);
674 		return (-1);
675 	}
676 
677 	zfs_close(zhp);
678 	return (0);
679 }
680 
681 static int
682 destroy_snap_clones(zfs_handle_t *zhp, void *arg)
683 {
684 	destroy_cbdata_t *cbp = arg;
685 	char thissnap[MAXPATHLEN];
686 	zfs_handle_t *szhp;
687 	boolean_t closezhp = cbp->cb_closezhp;
688 	int rv;
689 
690 	(void) snprintf(thissnap, sizeof (thissnap),
691 	    "%s@%s", zfs_get_name(zhp), cbp->cb_snapname);
692 
693 	libzfs_print_on_error(g_zfs, B_FALSE);
694 	szhp = zfs_open(g_zfs, thissnap, ZFS_TYPE_SNAPSHOT);
695 	libzfs_print_on_error(g_zfs, B_TRUE);
696 	if (szhp) {
697 		/*
698 		 * Destroy any clones of this snapshot
699 		 */
700 		if (zfs_iter_dependents(szhp, B_FALSE, destroy_callback,
701 		    cbp) != 0) {
702 			zfs_close(szhp);
703 			if (closezhp)
704 				zfs_close(zhp);
705 			return (-1);
706 		}
707 		zfs_close(szhp);
708 	}
709 
710 	cbp->cb_closezhp = B_TRUE;
711 	rv = zfs_iter_filesystems(zhp, destroy_snap_clones, arg);
712 	if (closezhp)
713 		zfs_close(zhp);
714 	return (rv);
715 }
716 
717 static int
718 zfs_do_destroy(int argc, char **argv)
719 {
720 	destroy_cbdata_t cb = { 0 };
721 	int c;
722 	zfs_handle_t *zhp;
723 	char *cp;
724 
725 	/* check options */
726 	while ((c = getopt(argc, argv, "frR")) != -1) {
727 		switch (c) {
728 		case 'f':
729 			cb.cb_force = 1;
730 			break;
731 		case 'r':
732 			cb.cb_recurse = 1;
733 			break;
734 		case 'R':
735 			cb.cb_recurse = 1;
736 			cb.cb_doclones = 1;
737 			break;
738 		case '?':
739 		default:
740 			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
741 			    optopt);
742 			usage(B_FALSE);
743 		}
744 	}
745 
746 	argc -= optind;
747 	argv += optind;
748 
749 	/* check number of arguments */
750 	if (argc == 0) {
751 		(void) fprintf(stderr, gettext("missing path argument\n"));
752 		usage(B_FALSE);
753 	}
754 	if (argc > 1) {
755 		(void) fprintf(stderr, gettext("too many arguments\n"));
756 		usage(B_FALSE);
757 	}
758 
759 	/*
760 	 * If we are doing recursive destroy of a snapshot, then the
761 	 * named snapshot may not exist.  Go straight to libzfs.
762 	 */
763 	if (cb.cb_recurse && (cp = strchr(argv[0], '@'))) {
764 		int ret;
765 
766 		*cp = '\0';
767 		if ((zhp = zfs_open(g_zfs, argv[0], ZFS_TYPE_ANY)) == NULL)
768 			return (1);
769 		*cp = '@';
770 		cp++;
771 
772 		if (cb.cb_doclones) {
773 			cb.cb_snapname = cp;
774 			if (destroy_snap_clones(zhp, &cb) != 0) {
775 				zfs_close(zhp);
776 				return (1);
777 			}
778 		}
779 
780 		ret = zfs_destroy_snaps(zhp, cp);
781 		zfs_close(zhp);
782 		if (ret) {
783 			(void) fprintf(stderr,
784 			    gettext("no snapshots destroyed\n"));
785 		}
786 		return (ret != 0);
787 	}
788 
789 
790 	/* Open the given dataset */
791 	if ((zhp = zfs_open(g_zfs, argv[0], ZFS_TYPE_ANY)) == NULL)
792 		return (1);
793 
794 	cb.cb_target = zhp;
795 
796 	/*
797 	 * Perform an explicit check for pools before going any further.
798 	 */
799 	if (!cb.cb_recurse && strchr(zfs_get_name(zhp), '/') == NULL &&
800 	    zfs_get_type(zhp) == ZFS_TYPE_FILESYSTEM) {
801 		(void) fprintf(stderr, gettext("cannot destroy '%s': "
802 		    "operation does not apply to pools\n"),
803 		    zfs_get_name(zhp));
804 		(void) fprintf(stderr, gettext("use 'zfs destroy -r "
805 		    "%s' to destroy all datasets in the pool\n"),
806 		    zfs_get_name(zhp));
807 		(void) fprintf(stderr, gettext("use 'zpool destroy %s' "
808 		    "to destroy the pool itself\n"), zfs_get_name(zhp));
809 		zfs_close(zhp);
810 		return (1);
811 	}
812 
813 	/*
814 	 * Check for any dependents and/or clones.
815 	 */
816 	cb.cb_first = B_TRUE;
817 	if (!cb.cb_doclones &&
818 	    zfs_iter_dependents(zhp, B_TRUE, destroy_check_dependent,
819 	    &cb) != 0) {
820 		zfs_close(zhp);
821 		return (1);
822 	}
823 
824 
825 	if (cb.cb_error ||
826 	    zfs_iter_dependents(zhp, B_FALSE, destroy_callback, &cb) != 0) {
827 		zfs_close(zhp);
828 		return (1);
829 	}
830 
831 	/*
832 	 * Do the real thing.  The callback will close the handle regardless of
833 	 * whether it succeeds or not.
834 	 */
835 	if (destroy_callback(zhp, &cb) != 0)
836 		return (1);
837 
838 	zpool_log_history(g_zfs, argc + optind, argv - optind, argv[0],
839 	    B_FALSE, B_FALSE);
840 
841 	return (0);
842 }
843 
844 /*
845  * zfs get [-rHp] [-o field[,field]...] [-s source[,source]...]
846  * 	< all | property[,property]... > < fs | snap | vol > ...
847  *
848  *	-r	recurse over any child datasets
849  *	-H	scripted mode.  Headers are stripped, and fields are separated
850  *		by tabs instead of spaces.
851  *	-o	Set of fields to display.  One of "name,property,value,source".
852  *		Default is all four.
853  *	-s	Set of sources to allow.  One of
854  *		"local,default,inherited,temporary,none".  Default is all
855  *		five.
856  *	-p	Display values in parsable (literal) format.
857  *
858  *  Prints properties for the given datasets.  The user can control which
859  *  columns to display as well as which property types to allow.
860  */
861 typedef struct get_cbdata {
862 	int cb_sources;
863 	int cb_columns[4];
864 	int cb_colwidths[5];
865 	boolean_t cb_scripted;
866 	boolean_t cb_literal;
867 	boolean_t cb_first;
868 	zfs_proplist_t *cb_proplist;
869 } get_cbdata_t;
870 
871 #define	GET_COL_NAME		1
872 #define	GET_COL_PROPERTY	2
873 #define	GET_COL_VALUE		3
874 #define	GET_COL_SOURCE		4
875 
876 /*
877  * Print the column headers for 'zfs get'.
878  */
879 static void
880 print_get_headers(get_cbdata_t *cbp)
881 {
882 	zfs_proplist_t *pl = cbp->cb_proplist;
883 	int i;
884 	char *title;
885 	size_t len;
886 
887 	cbp->cb_first = B_FALSE;
888 	if (cbp->cb_scripted)
889 		return;
890 
891 	/*
892 	 * Start with the length of the column headers.
893 	 */
894 	cbp->cb_colwidths[GET_COL_NAME] = strlen(gettext("NAME"));
895 	cbp->cb_colwidths[GET_COL_PROPERTY] = strlen(gettext("PROPERTY"));
896 	cbp->cb_colwidths[GET_COL_VALUE] = strlen(gettext("VALUE"));
897 	cbp->cb_colwidths[GET_COL_SOURCE] = strlen(gettext("SOURCE"));
898 
899 	/*
900 	 * Go through and calculate the widths for each column.  For the
901 	 * 'source' column, we kludge it up by taking the worst-case scenario of
902 	 * inheriting from the longest name.  This is acceptable because in the
903 	 * majority of cases 'SOURCE' is the last column displayed, and we don't
904 	 * use the width anyway.  Note that the 'VALUE' column can be oversized,
905 	 * if the name of the property is much longer the any values we find.
906 	 */
907 	for (pl = cbp->cb_proplist; pl != NULL; pl = pl->pl_next) {
908 		/*
909 		 * 'PROPERTY' column
910 		 */
911 		if (pl->pl_prop != ZFS_PROP_INVAL) {
912 			len = strlen(zfs_prop_to_name(pl->pl_prop));
913 			if (len > cbp->cb_colwidths[GET_COL_PROPERTY])
914 				cbp->cb_colwidths[GET_COL_PROPERTY] = len;
915 		} else {
916 			len = strlen(pl->pl_user_prop);
917 			if (len > cbp->cb_colwidths[GET_COL_PROPERTY])
918 				cbp->cb_colwidths[GET_COL_PROPERTY] = len;
919 		}
920 
921 		/*
922 		 * 'VALUE' column
923 		 */
924 		if ((pl->pl_prop != ZFS_PROP_NAME || !pl->pl_all) &&
925 		    pl->pl_width > cbp->cb_colwidths[GET_COL_VALUE])
926 			cbp->cb_colwidths[GET_COL_VALUE] = pl->pl_width;
927 
928 		/*
929 		 * 'NAME' and 'SOURCE' columns
930 		 */
931 		if (pl->pl_prop == ZFS_PROP_NAME &&
932 		    pl->pl_width > cbp->cb_colwidths[GET_COL_NAME]) {
933 			cbp->cb_colwidths[GET_COL_NAME] = pl->pl_width;
934 			cbp->cb_colwidths[GET_COL_SOURCE] = pl->pl_width +
935 			    strlen(gettext("inherited from"));
936 		}
937 	}
938 
939 	/*
940 	 * Now go through and print the headers.
941 	 */
942 	for (i = 0; i < 4; i++) {
943 		switch (cbp->cb_columns[i]) {
944 		case GET_COL_NAME:
945 			title = gettext("NAME");
946 			break;
947 		case GET_COL_PROPERTY:
948 			title = gettext("PROPERTY");
949 			break;
950 		case GET_COL_VALUE:
951 			title = gettext("VALUE");
952 			break;
953 		case GET_COL_SOURCE:
954 			title = gettext("SOURCE");
955 			break;
956 		default:
957 			title = NULL;
958 		}
959 
960 		if (title != NULL) {
961 			if (i == 3 || cbp->cb_columns[i + 1] == 0)
962 				(void) printf("%s", title);
963 			else
964 				(void) printf("%-*s  ",
965 				    cbp->cb_colwidths[cbp->cb_columns[i]],
966 				    title);
967 		}
968 	}
969 	(void) printf("\n");
970 }
971 
972 /*
973  * Display a single line of output, according to the settings in the callback
974  * structure.
975  */
976 static void
977 print_one_property(zfs_handle_t *zhp, get_cbdata_t *cbp, const char *propname,
978     const char *value, zfs_source_t sourcetype, const char *source)
979 {
980 	int i;
981 	const char *str;
982 	char buf[128];
983 
984 	/*
985 	 * Ignore those source types that the user has chosen to ignore.
986 	 */
987 	if ((sourcetype & cbp->cb_sources) == 0)
988 		return;
989 
990 	if (cbp->cb_first)
991 		print_get_headers(cbp);
992 
993 	for (i = 0; i < 4; i++) {
994 		switch (cbp->cb_columns[i]) {
995 		case GET_COL_NAME:
996 			str = zfs_get_name(zhp);
997 			break;
998 
999 		case GET_COL_PROPERTY:
1000 			str = propname;
1001 			break;
1002 
1003 		case GET_COL_VALUE:
1004 			str = value;
1005 			break;
1006 
1007 		case GET_COL_SOURCE:
1008 			switch (sourcetype) {
1009 			case ZFS_SRC_NONE:
1010 				str = "-";
1011 				break;
1012 
1013 			case ZFS_SRC_DEFAULT:
1014 				str = "default";
1015 				break;
1016 
1017 			case ZFS_SRC_LOCAL:
1018 				str = "local";
1019 				break;
1020 
1021 			case ZFS_SRC_TEMPORARY:
1022 				str = "temporary";
1023 				break;
1024 
1025 			case ZFS_SRC_INHERITED:
1026 				(void) snprintf(buf, sizeof (buf),
1027 				    "inherited from %s", source);
1028 				str = buf;
1029 				break;
1030 			}
1031 			break;
1032 
1033 		default:
1034 			continue;
1035 		}
1036 
1037 		if (cbp->cb_columns[i + 1] == 0)
1038 			(void) printf("%s", str);
1039 		else if (cbp->cb_scripted)
1040 			(void) printf("%s\t", str);
1041 		else
1042 			(void) printf("%-*s  ",
1043 			    cbp->cb_colwidths[cbp->cb_columns[i]],
1044 			    str);
1045 
1046 	}
1047 
1048 	(void) printf("\n");
1049 }
1050 
1051 /*
1052  * Invoked to display the properties for a single dataset.
1053  */
1054 static int
1055 get_callback(zfs_handle_t *zhp, void *data)
1056 {
1057 	char buf[ZFS_MAXPROPLEN];
1058 	zfs_source_t sourcetype;
1059 	char source[ZFS_MAXNAMELEN];
1060 	get_cbdata_t *cbp = data;
1061 	nvlist_t *userprop = zfs_get_user_props(zhp);
1062 	zfs_proplist_t *pl = cbp->cb_proplist;
1063 	nvlist_t *propval;
1064 	char *strval;
1065 	char *sourceval;
1066 
1067 	for (; pl != NULL; pl = pl->pl_next) {
1068 		/*
1069 		 * Skip the special fake placeholder.  This will also skip over
1070 		 * the name property when 'all' is specified.
1071 		 */
1072 		if (pl->pl_prop == ZFS_PROP_NAME &&
1073 		    pl == cbp->cb_proplist)
1074 			continue;
1075 
1076 		if (pl->pl_prop != ZFS_PROP_INVAL) {
1077 			if (zfs_prop_get(zhp, pl->pl_prop, buf,
1078 			    sizeof (buf), &sourcetype, source,
1079 			    sizeof (source),
1080 			    cbp->cb_literal) != 0) {
1081 				if (pl->pl_all)
1082 					continue;
1083 				sourcetype = ZFS_SRC_NONE;
1084 				(void) strlcpy(buf, "-", sizeof (buf));
1085 			}
1086 
1087 			print_one_property(zhp, cbp,
1088 			    zfs_prop_to_name(pl->pl_prop),
1089 			    buf, sourcetype, source);
1090 		} else {
1091 			if (nvlist_lookup_nvlist(userprop,
1092 			    pl->pl_user_prop, &propval) != 0) {
1093 				if (pl->pl_all)
1094 					continue;
1095 				sourcetype = ZFS_SRC_NONE;
1096 				strval = "-";
1097 			} else {
1098 				verify(nvlist_lookup_string(propval,
1099 				    ZFS_PROP_VALUE, &strval) == 0);
1100 				verify(nvlist_lookup_string(propval,
1101 				    ZFS_PROP_SOURCE, &sourceval) == 0);
1102 
1103 				if (strcmp(sourceval,
1104 				    zfs_get_name(zhp)) == 0) {
1105 					sourcetype = ZFS_SRC_LOCAL;
1106 				} else {
1107 					sourcetype = ZFS_SRC_INHERITED;
1108 					(void) strlcpy(source,
1109 					    sourceval, sizeof (source));
1110 				}
1111 			}
1112 
1113 			print_one_property(zhp, cbp,
1114 			    pl->pl_user_prop, strval, sourcetype,
1115 			    source);
1116 		}
1117 	}
1118 
1119 	return (0);
1120 }
1121 
1122 static int
1123 zfs_do_get(int argc, char **argv)
1124 {
1125 	get_cbdata_t cb = { 0 };
1126 	boolean_t recurse = B_FALSE;
1127 	int i, c;
1128 	char *value, *fields;
1129 	int ret;
1130 	zfs_proplist_t fake_name = { 0 };
1131 
1132 	/*
1133 	 * Set up default columns and sources.
1134 	 */
1135 	cb.cb_sources = ZFS_SRC_ALL;
1136 	cb.cb_columns[0] = GET_COL_NAME;
1137 	cb.cb_columns[1] = GET_COL_PROPERTY;
1138 	cb.cb_columns[2] = GET_COL_VALUE;
1139 	cb.cb_columns[3] = GET_COL_SOURCE;
1140 
1141 	/* check options */
1142 	while ((c = getopt(argc, argv, ":o:s:rHp")) != -1) {
1143 		switch (c) {
1144 		case 'p':
1145 			cb.cb_literal = B_TRUE;
1146 			break;
1147 		case 'r':
1148 			recurse = B_TRUE;
1149 			break;
1150 		case 'H':
1151 			cb.cb_scripted = B_TRUE;
1152 			break;
1153 		case ':':
1154 			(void) fprintf(stderr, gettext("missing argument for "
1155 			    "'%c' option\n"), optopt);
1156 			usage(B_FALSE);
1157 			break;
1158 		case 'o':
1159 			/*
1160 			 * Process the set of columns to display.  We zero out
1161 			 * the structure to give us a blank slate.
1162 			 */
1163 			bzero(&cb.cb_columns, sizeof (cb.cb_columns));
1164 			i = 0;
1165 			while (*optarg != '\0') {
1166 				static char *col_subopts[] =
1167 				    { "name", "property", "value", "source",
1168 				    NULL };
1169 
1170 				if (i == 4) {
1171 					(void) fprintf(stderr, gettext("too "
1172 					    "many fields given to -o "
1173 					    "option\n"));
1174 					usage(B_FALSE);
1175 				}
1176 
1177 				switch (getsubopt(&optarg, col_subopts,
1178 				    &value)) {
1179 				case 0:
1180 					cb.cb_columns[i++] = GET_COL_NAME;
1181 					break;
1182 				case 1:
1183 					cb.cb_columns[i++] = GET_COL_PROPERTY;
1184 					break;
1185 				case 2:
1186 					cb.cb_columns[i++] = GET_COL_VALUE;
1187 					break;
1188 				case 3:
1189 					cb.cb_columns[i++] = GET_COL_SOURCE;
1190 					break;
1191 				default:
1192 					(void) fprintf(stderr,
1193 					    gettext("invalid column name "
1194 					    "'%s'\n"), value);
1195 					    usage(B_FALSE);
1196 				}
1197 			}
1198 			break;
1199 
1200 		case 's':
1201 			cb.cb_sources = 0;
1202 			while (*optarg != '\0') {
1203 				static char *source_subopts[] = {
1204 					"local", "default", "inherited",
1205 					"temporary", "none", NULL };
1206 
1207 				switch (getsubopt(&optarg, source_subopts,
1208 				    &value)) {
1209 				case 0:
1210 					cb.cb_sources |= ZFS_SRC_LOCAL;
1211 					break;
1212 				case 1:
1213 					cb.cb_sources |= ZFS_SRC_DEFAULT;
1214 					break;
1215 				case 2:
1216 					cb.cb_sources |= ZFS_SRC_INHERITED;
1217 					break;
1218 				case 3:
1219 					cb.cb_sources |= ZFS_SRC_TEMPORARY;
1220 					break;
1221 				case 4:
1222 					cb.cb_sources |= ZFS_SRC_NONE;
1223 					break;
1224 				default:
1225 					(void) fprintf(stderr,
1226 					    gettext("invalid source "
1227 					    "'%s'\n"), value);
1228 					    usage(B_FALSE);
1229 				}
1230 			}
1231 			break;
1232 
1233 		case '?':
1234 			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
1235 			    optopt);
1236 			usage(B_FALSE);
1237 		}
1238 	}
1239 
1240 	argc -= optind;
1241 	argv += optind;
1242 
1243 	if (argc < 1) {
1244 		(void) fprintf(stderr, gettext("missing property "
1245 		    "argument\n"));
1246 		usage(B_FALSE);
1247 	}
1248 
1249 	fields = argv[0];
1250 
1251 	if (zfs_get_proplist(g_zfs, fields, &cb.cb_proplist) != 0)
1252 		usage(B_FALSE);
1253 
1254 	argc--;
1255 	argv++;
1256 
1257 	/*
1258 	 * As part of zfs_expand_proplist(), we keep track of the maximum column
1259 	 * width for each property.  For the 'NAME' (and 'SOURCE') columns, we
1260 	 * need to know the maximum name length.  However, the user likely did
1261 	 * not specify 'name' as one of the properties to fetch, so we need to
1262 	 * make sure we always include at least this property for
1263 	 * print_get_headers() to work properly.
1264 	 */
1265 	if (cb.cb_proplist != NULL) {
1266 		fake_name.pl_prop = ZFS_PROP_NAME;
1267 		fake_name.pl_width = strlen(gettext("NAME"));
1268 		fake_name.pl_next = cb.cb_proplist;
1269 		cb.cb_proplist = &fake_name;
1270 	}
1271 
1272 	cb.cb_first = B_TRUE;
1273 
1274 	/* run for each object */
1275 	ret = zfs_for_each(argc, argv, recurse, ZFS_TYPE_ANY, NULL,
1276 	    &cb.cb_proplist, get_callback, &cb);
1277 
1278 	if (cb.cb_proplist == &fake_name)
1279 		zfs_free_proplist(fake_name.pl_next);
1280 	else
1281 		zfs_free_proplist(cb.cb_proplist);
1282 
1283 	return (ret);
1284 }
1285 
1286 /*
1287  * inherit [-r] <property> <fs|vol> ...
1288  *
1289  * 	-r	Recurse over all children
1290  *
1291  * For each dataset specified on the command line, inherit the given property
1292  * from its parent.  Inheriting a property at the pool level will cause it to
1293  * use the default value.  The '-r' flag will recurse over all children, and is
1294  * useful for setting a property on a hierarchy-wide basis, regardless of any
1295  * local modifications for each dataset.
1296  */
1297 typedef struct inherit_cbdata {
1298 	char		*cb_propname;
1299 	boolean_t	cb_any_successful;
1300 } inherit_cbdata_t;
1301 
1302 static int
1303 inherit_callback(zfs_handle_t *zhp, void *data)
1304 {
1305 	inherit_cbdata_t *cbp = data;
1306 	int ret;
1307 
1308 	ret = zfs_prop_inherit(zhp, cbp->cb_propname);
1309 	if (ret == 0)
1310 		cbp->cb_any_successful = B_TRUE;
1311 	return (ret != 0);
1312 }
1313 
1314 static int
1315 zfs_do_inherit(int argc, char **argv)
1316 {
1317 	boolean_t recurse = B_FALSE;
1318 	int c;
1319 	zfs_prop_t prop;
1320 	inherit_cbdata_t cb;
1321 	int ret;
1322 
1323 	/* check options */
1324 	while ((c = getopt(argc, argv, "r")) != -1) {
1325 		switch (c) {
1326 		case 'r':
1327 			recurse = B_TRUE;
1328 			break;
1329 		case '?':
1330 		default:
1331 			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
1332 			    optopt);
1333 			usage(B_FALSE);
1334 		}
1335 	}
1336 
1337 	argc -= optind;
1338 	argv += optind;
1339 
1340 	/* check number of arguments */
1341 	if (argc < 1) {
1342 		(void) fprintf(stderr, gettext("missing property argument\n"));
1343 		usage(B_FALSE);
1344 	}
1345 	if (argc < 2) {
1346 		(void) fprintf(stderr, gettext("missing dataset argument\n"));
1347 		usage(B_FALSE);
1348 	}
1349 
1350 	cb.cb_propname = argv[0];
1351 	argc--;
1352 	argv++;
1353 
1354 	if ((prop = zfs_name_to_prop(cb.cb_propname)) != ZFS_PROP_INVAL) {
1355 		if (zfs_prop_readonly(prop)) {
1356 			(void) fprintf(stderr, gettext(
1357 			    "%s property is read-only\n"),
1358 			    cb.cb_propname);
1359 			return (1);
1360 		}
1361 		if (!zfs_prop_inheritable(prop)) {
1362 			(void) fprintf(stderr, gettext("'%s' property cannot "
1363 			    "be inherited\n"), cb.cb_propname);
1364 			if (prop == ZFS_PROP_QUOTA ||
1365 			    prop == ZFS_PROP_RESERVATION)
1366 				(void) fprintf(stderr, gettext("use 'zfs set "
1367 				    "%s=none' to clear\n"), cb.cb_propname);
1368 			return (1);
1369 		}
1370 	} else if (!zfs_prop_user(cb.cb_propname)) {
1371 		(void) fprintf(stderr, gettext(
1372 		    "invalid property '%s'\n"),
1373 		    cb.cb_propname);
1374 		usage(B_FALSE);
1375 	}
1376 
1377 	cb.cb_any_successful = B_FALSE;
1378 
1379 	ret = zfs_for_each(argc, argv, recurse,
1380 	    ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME, NULL, NULL,
1381 	    inherit_callback, &cb);
1382 
1383 	if (cb.cb_any_successful) {
1384 		zpool_log_history(g_zfs, argc + optind + 1, argv - optind - 1,
1385 		    argv[0], B_FALSE, B_FALSE);
1386 	}
1387 
1388 	return (ret);
1389 }
1390 
1391 /*
1392  * list [-rH] [-o property[,property]...] [-t type[,type]...]
1393  *      [-s property [-s property]...] [-S property [-S property]...]
1394  *      <dataset> ...
1395  *
1396  * 	-r	Recurse over all children
1397  * 	-H	Scripted mode; elide headers and separate colums by tabs
1398  * 	-o	Control which fields to display.
1399  * 	-t	Control which object types to display.
1400  *	-s	Specify sort columns, descending order.
1401  *	-S	Specify sort columns, ascending order.
1402  *
1403  * When given no arguments, lists all filesystems in the system.
1404  * Otherwise, list the specified datasets, optionally recursing down them if
1405  * '-r' is specified.
1406  */
1407 typedef struct list_cbdata {
1408 	boolean_t	cb_first;
1409 	boolean_t	cb_scripted;
1410 	zfs_proplist_t	*cb_proplist;
1411 } list_cbdata_t;
1412 
1413 /*
1414  * Given a list of columns to display, output appropriate headers for each one.
1415  */
1416 static void
1417 print_header(zfs_proplist_t *pl)
1418 {
1419 	char headerbuf[ZFS_MAXPROPLEN];
1420 	const char *header;
1421 	int i;
1422 	boolean_t first = B_TRUE;
1423 	boolean_t right_justify;
1424 
1425 	for (; pl != NULL; pl = pl->pl_next) {
1426 		if (!first) {
1427 			(void) printf("  ");
1428 		} else {
1429 			first = B_FALSE;
1430 		}
1431 
1432 		right_justify = B_FALSE;
1433 		if (pl->pl_prop != ZFS_PROP_INVAL) {
1434 			header = zfs_prop_column_name(pl->pl_prop);
1435 			right_justify = zfs_prop_align_right(pl->pl_prop);
1436 		} else {
1437 			for (i = 0; pl->pl_user_prop[i] != '\0'; i++)
1438 				headerbuf[i] = toupper(pl->pl_user_prop[i]);
1439 			headerbuf[i] = '\0';
1440 			header = headerbuf;
1441 		}
1442 
1443 		if (pl->pl_next == NULL && !right_justify)
1444 			(void) printf("%s", header);
1445 		else if (right_justify)
1446 			(void) printf("%*s", pl->pl_width, header);
1447 		else
1448 			(void) printf("%-*s", pl->pl_width, header);
1449 	}
1450 
1451 	(void) printf("\n");
1452 }
1453 
1454 /*
1455  * Given a dataset and a list of fields, print out all the properties according
1456  * to the described layout.
1457  */
1458 static void
1459 print_dataset(zfs_handle_t *zhp, zfs_proplist_t *pl, int scripted)
1460 {
1461 	boolean_t first = B_TRUE;
1462 	char property[ZFS_MAXPROPLEN];
1463 	nvlist_t *userprops = zfs_get_user_props(zhp);
1464 	nvlist_t *propval;
1465 	char *propstr;
1466 	boolean_t right_justify;
1467 	int width;
1468 
1469 	for (; pl != NULL; pl = pl->pl_next) {
1470 		if (!first) {
1471 			if (scripted)
1472 				(void) printf("\t");
1473 			else
1474 				(void) printf("  ");
1475 		} else {
1476 			first = B_FALSE;
1477 		}
1478 
1479 		right_justify = B_FALSE;
1480 		if (pl->pl_prop != ZFS_PROP_INVAL) {
1481 			if (zfs_prop_get(zhp, pl->pl_prop, property,
1482 			    sizeof (property), NULL, NULL, 0, B_FALSE) != 0)
1483 				propstr = "-";
1484 			else
1485 				propstr = property;
1486 
1487 			right_justify = zfs_prop_align_right(pl->pl_prop);
1488 		} else {
1489 			if (nvlist_lookup_nvlist(userprops,
1490 			    pl->pl_user_prop, &propval) != 0)
1491 				propstr = "-";
1492 			else
1493 				verify(nvlist_lookup_string(propval,
1494 				    ZFS_PROP_VALUE, &propstr) == 0);
1495 		}
1496 
1497 		width = pl->pl_width;
1498 
1499 		/*
1500 		 * If this is being called in scripted mode, or if this is the
1501 		 * last column and it is left-justified, don't include a width
1502 		 * format specifier.
1503 		 */
1504 		if (scripted || (pl->pl_next == NULL && !right_justify))
1505 			(void) printf("%s", propstr);
1506 		else if (right_justify)
1507 			(void) printf("%*s", width, propstr);
1508 		else
1509 			(void) printf("%-*s", width, propstr);
1510 	}
1511 
1512 	(void) printf("\n");
1513 }
1514 
1515 /*
1516  * Generic callback function to list a dataset or snapshot.
1517  */
1518 static int
1519 list_callback(zfs_handle_t *zhp, void *data)
1520 {
1521 	list_cbdata_t *cbp = data;
1522 
1523 	if (cbp->cb_first) {
1524 		if (!cbp->cb_scripted)
1525 			print_header(cbp->cb_proplist);
1526 		cbp->cb_first = B_FALSE;
1527 	}
1528 
1529 	print_dataset(zhp, cbp->cb_proplist, cbp->cb_scripted);
1530 
1531 	return (0);
1532 }
1533 
1534 static int
1535 zfs_do_list(int argc, char **argv)
1536 {
1537 	int c;
1538 	boolean_t recurse = B_FALSE;
1539 	boolean_t scripted = B_FALSE;
1540 	static char default_fields[] =
1541 	    "name,used,available,referenced,mountpoint";
1542 	int types = ZFS_TYPE_ANY;
1543 	char *fields = NULL;
1544 	char *basic_fields = default_fields;
1545 	list_cbdata_t cb = { 0 };
1546 	char *value;
1547 	int ret;
1548 	char *type_subopts[] = { "filesystem", "volume", "snapshot", NULL };
1549 	zfs_sort_column_t *sortcol = NULL;
1550 
1551 	/* check options */
1552 	while ((c = getopt(argc, argv, ":o:rt:Hs:S:")) != -1) {
1553 		switch (c) {
1554 		case 'o':
1555 			fields = optarg;
1556 			break;
1557 		case 'r':
1558 			recurse = B_TRUE;
1559 			break;
1560 		case 'H':
1561 			scripted = B_TRUE;
1562 			break;
1563 		case 's':
1564 			if (zfs_add_sort_column(&sortcol, optarg,
1565 			    B_FALSE) != 0) {
1566 				(void) fprintf(stderr,
1567 				    gettext("invalid property '%s'\n"), optarg);
1568 				usage(B_FALSE);
1569 			}
1570 			break;
1571 		case 'S':
1572 			if (zfs_add_sort_column(&sortcol, optarg,
1573 			    B_TRUE) != 0) {
1574 				(void) fprintf(stderr,
1575 				    gettext("invalid property '%s'\n"), optarg);
1576 				usage(B_FALSE);
1577 			}
1578 			break;
1579 		case 't':
1580 			types = 0;
1581 			while (*optarg != '\0') {
1582 				switch (getsubopt(&optarg, type_subopts,
1583 				    &value)) {
1584 				case 0:
1585 					types |= ZFS_TYPE_FILESYSTEM;
1586 					break;
1587 				case 1:
1588 					types |= ZFS_TYPE_VOLUME;
1589 					break;
1590 				case 2:
1591 					types |= ZFS_TYPE_SNAPSHOT;
1592 					break;
1593 				default:
1594 					(void) fprintf(stderr,
1595 					    gettext("invalid type '%s'\n"),
1596 					    value);
1597 					usage(B_FALSE);
1598 				}
1599 			}
1600 			break;
1601 		case ':':
1602 			(void) fprintf(stderr, gettext("missing argument for "
1603 			    "'%c' option\n"), optopt);
1604 			usage(B_FALSE);
1605 			break;
1606 		case '?':
1607 			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
1608 			    optopt);
1609 			usage(B_FALSE);
1610 		}
1611 	}
1612 
1613 	argc -= optind;
1614 	argv += optind;
1615 
1616 	if (fields == NULL)
1617 		fields = basic_fields;
1618 
1619 	/*
1620 	 * If the user specifies '-o all', the zfs_get_proplist() doesn't
1621 	 * normally include the name of the dataset.  For 'zfs list', we always
1622 	 * want this property to be first.
1623 	 */
1624 	if (zfs_get_proplist(g_zfs, fields, &cb.cb_proplist) != 0)
1625 		usage(B_FALSE);
1626 
1627 	cb.cb_scripted = scripted;
1628 	cb.cb_first = B_TRUE;
1629 
1630 	ret = zfs_for_each(argc, argv, recurse, types, sortcol, &cb.cb_proplist,
1631 	    list_callback, &cb);
1632 
1633 	zfs_free_proplist(cb.cb_proplist);
1634 	zfs_free_sort_columns(sortcol);
1635 
1636 	if (ret == 0 && cb.cb_first)
1637 		(void) printf(gettext("no datasets available\n"));
1638 
1639 	return (ret);
1640 }
1641 
1642 /*
1643  * zfs rename <fs | snap | vol> <fs | snap | vol>
1644  *
1645  * Renames the given dataset to another of the same type.
1646  */
1647 /* ARGSUSED */
1648 static int
1649 zfs_do_rename(int argc, char **argv)
1650 {
1651 	zfs_handle_t *zhp;
1652 	int ret;
1653 
1654 	/* check options */
1655 	if (argc > 1 && argv[1][0] == '-') {
1656 		(void) fprintf(stderr, gettext("invalid option '%c'\n"),
1657 		    argv[1][1]);
1658 		usage(B_FALSE);
1659 	}
1660 
1661 	/* check number of arguments */
1662 	if (argc < 2) {
1663 		(void) fprintf(stderr, gettext("missing source dataset "
1664 		    "argument\n"));
1665 		usage(B_FALSE);
1666 	}
1667 	if (argc < 3) {
1668 		(void) fprintf(stderr, gettext("missing target dataset "
1669 		    "argument\n"));
1670 		usage(B_FALSE);
1671 	}
1672 	if (argc > 3) {
1673 		(void) fprintf(stderr, gettext("too many arguments\n"));
1674 		usage(B_FALSE);
1675 	}
1676 
1677 	if ((zhp = zfs_open(g_zfs, argv[1], ZFS_TYPE_ANY)) == NULL)
1678 		return (1);
1679 
1680 	ret = (zfs_rename(zhp, argv[2]) != 0);
1681 
1682 	if (!ret)
1683 		zpool_log_history(g_zfs, argc, argv, argv[2], B_FALSE, B_FALSE);
1684 
1685 	zfs_close(zhp);
1686 	return (ret);
1687 }
1688 
1689 /*
1690  * zfs promote <fs>
1691  *
1692  * Promotes the given clone fs to be the parent
1693  */
1694 /* ARGSUSED */
1695 static int
1696 zfs_do_promote(int argc, char **argv)
1697 {
1698 	zfs_handle_t *zhp;
1699 	int ret;
1700 
1701 	/* check options */
1702 	if (argc > 1 && argv[1][0] == '-') {
1703 		(void) fprintf(stderr, gettext("invalid option '%c'\n"),
1704 		    argv[1][1]);
1705 		usage(B_FALSE);
1706 	}
1707 
1708 	/* check number of arguments */
1709 	if (argc < 2) {
1710 		(void) fprintf(stderr, gettext("missing clone filesystem"
1711 		    " argument\n"));
1712 		usage(B_FALSE);
1713 	}
1714 	if (argc > 2) {
1715 		(void) fprintf(stderr, gettext("too many arguments\n"));
1716 		usage(B_FALSE);
1717 	}
1718 
1719 	zhp = zfs_open(g_zfs, argv[1], ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME);
1720 	if (zhp == NULL)
1721 		return (1);
1722 
1723 	ret = (zfs_promote(zhp) != 0);
1724 
1725 	if (!ret)
1726 		zpool_log_history(g_zfs, argc, argv, argv[1], B_FALSE, B_FALSE);
1727 
1728 	zfs_close(zhp);
1729 	return (ret);
1730 }
1731 
1732 /*
1733  * zfs rollback [-rfR] <snapshot>
1734  *
1735  * 	-r	Delete any intervening snapshots before doing rollback
1736  * 	-R	Delete any snapshots and their clones
1737  * 	-f	Force unmount filesystems, even if they are in use.
1738  *
1739  * Given a filesystem, rollback to a specific snapshot, discarding any changes
1740  * since then and making it the active dataset.  If more recent snapshots exist,
1741  * the command will complain unless the '-r' flag is given.
1742  */
1743 typedef struct rollback_cbdata {
1744 	uint64_t	cb_create;
1745 	boolean_t	cb_first;
1746 	int		cb_doclones;
1747 	char		*cb_target;
1748 	int		cb_error;
1749 	boolean_t	cb_recurse;
1750 	boolean_t	cb_dependent;
1751 } rollback_cbdata_t;
1752 
1753 /*
1754  * Report any snapshots more recent than the one specified.  Used when '-r' is
1755  * not specified.  We reuse this same callback for the snapshot dependents - if
1756  * 'cb_dependent' is set, then this is a dependent and we should report it
1757  * without checking the transaction group.
1758  */
1759 static int
1760 rollback_check(zfs_handle_t *zhp, void *data)
1761 {
1762 	rollback_cbdata_t *cbp = data;
1763 
1764 	if (cbp->cb_doclones) {
1765 		zfs_close(zhp);
1766 		return (0);
1767 	}
1768 
1769 	if (!cbp->cb_dependent) {
1770 		if (strcmp(zfs_get_name(zhp), cbp->cb_target) != 0 &&
1771 		    zfs_get_type(zhp) == ZFS_TYPE_SNAPSHOT &&
1772 		    zfs_prop_get_int(zhp, ZFS_PROP_CREATETXG) >
1773 		    cbp->cb_create) {
1774 
1775 			if (cbp->cb_first && !cbp->cb_recurse) {
1776 				(void) fprintf(stderr, gettext("cannot "
1777 				    "rollback to '%s': more recent snapshots "
1778 				    "exist\n"),
1779 				    cbp->cb_target);
1780 				(void) fprintf(stderr, gettext("use '-r' to "
1781 				    "force deletion of the following "
1782 				    "snapshots:\n"));
1783 				cbp->cb_first = 0;
1784 				cbp->cb_error = 1;
1785 			}
1786 
1787 			if (cbp->cb_recurse) {
1788 				cbp->cb_dependent = B_TRUE;
1789 				if (zfs_iter_dependents(zhp, B_TRUE,
1790 				    rollback_check, cbp) != 0) {
1791 					zfs_close(zhp);
1792 					return (-1);
1793 				}
1794 				cbp->cb_dependent = B_FALSE;
1795 			} else {
1796 				(void) fprintf(stderr, "%s\n",
1797 				    zfs_get_name(zhp));
1798 			}
1799 		}
1800 	} else {
1801 		if (cbp->cb_first && cbp->cb_recurse) {
1802 			(void) fprintf(stderr, gettext("cannot rollback to "
1803 			    "'%s': clones of previous snapshots exist\n"),
1804 			    cbp->cb_target);
1805 			(void) fprintf(stderr, gettext("use '-R' to "
1806 			    "force deletion of the following clones and "
1807 			    "dependents:\n"));
1808 			cbp->cb_first = 0;
1809 			cbp->cb_error = 1;
1810 		}
1811 
1812 		(void) fprintf(stderr, "%s\n", zfs_get_name(zhp));
1813 	}
1814 
1815 	zfs_close(zhp);
1816 	return (0);
1817 }
1818 
1819 static int
1820 zfs_do_rollback(int argc, char **argv)
1821 {
1822 	int ret;
1823 	int c;
1824 	rollback_cbdata_t cb = { 0 };
1825 	zfs_handle_t *zhp, *snap;
1826 	char parentname[ZFS_MAXNAMELEN];
1827 	char *delim;
1828 	int force = 0;
1829 
1830 	/* check options */
1831 	while ((c = getopt(argc, argv, "rfR")) != -1) {
1832 		switch (c) {
1833 		case 'f':
1834 			force = 1;
1835 			break;
1836 		case 'r':
1837 			cb.cb_recurse = 1;
1838 			break;
1839 		case 'R':
1840 			cb.cb_recurse = 1;
1841 			cb.cb_doclones = 1;
1842 			break;
1843 		case '?':
1844 			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
1845 			    optopt);
1846 			usage(B_FALSE);
1847 		}
1848 	}
1849 
1850 	argc -= optind;
1851 	argv += optind;
1852 
1853 	/* check number of arguments */
1854 	if (argc < 1) {
1855 		(void) fprintf(stderr, gettext("missing dataset argument\n"));
1856 		usage(B_FALSE);
1857 	}
1858 	if (argc > 1) {
1859 		(void) fprintf(stderr, gettext("too many arguments\n"));
1860 		usage(B_FALSE);
1861 	}
1862 
1863 	/* open the snapshot */
1864 	if ((snap = zfs_open(g_zfs, argv[0], ZFS_TYPE_SNAPSHOT)) == NULL)
1865 		return (1);
1866 
1867 	/* open the parent dataset */
1868 	(void) strlcpy(parentname, argv[0], sizeof (parentname));
1869 	verify((delim = strrchr(parentname, '@')) != NULL);
1870 	*delim = '\0';
1871 	if ((zhp = zfs_open(g_zfs, parentname, ZFS_TYPE_ANY)) == NULL) {
1872 		zfs_close(snap);
1873 		return (1);
1874 	}
1875 
1876 	/*
1877 	 * Check for more recent snapshots and/or clones based on the presence
1878 	 * of '-r' and '-R'.
1879 	 */
1880 	cb.cb_target = argv[0];
1881 	cb.cb_create = zfs_prop_get_int(snap, ZFS_PROP_CREATETXG);
1882 	cb.cb_first = B_TRUE;
1883 	cb.cb_error = 0;
1884 	if ((ret = zfs_iter_children(zhp, rollback_check, &cb)) != 0)
1885 		goto out;
1886 
1887 	if ((ret = cb.cb_error) != 0)
1888 		goto out;
1889 
1890 	/*
1891 	 * Rollback parent to the given snapshot.
1892 	 */
1893 	ret = zfs_rollback(zhp, snap, force);
1894 
1895 	if (!ret) {
1896 		zpool_log_history(g_zfs, argc + optind, argv - optind, argv[0],
1897 		    B_FALSE, B_FALSE);
1898 	}
1899 
1900 out:
1901 	zfs_close(snap);
1902 	zfs_close(zhp);
1903 
1904 	if (ret == 0)
1905 		return (0);
1906 	else
1907 		return (1);
1908 }
1909 
1910 /*
1911  * zfs set property=value { fs | snap | vol } ...
1912  *
1913  * Sets the given property for all datasets specified on the command line.
1914  */
1915 typedef struct set_cbdata {
1916 	char		*cb_propname;
1917 	char		*cb_value;
1918 	boolean_t	cb_any_successful;
1919 } set_cbdata_t;
1920 
1921 static int
1922 set_callback(zfs_handle_t *zhp, void *data)
1923 {
1924 	set_cbdata_t *cbp = data;
1925 
1926 	if (zfs_prop_set(zhp, cbp->cb_propname, cbp->cb_value) != 0) {
1927 		switch (libzfs_errno(g_zfs)) {
1928 		case EZFS_MOUNTFAILED:
1929 			(void) fprintf(stderr, gettext("property may be set "
1930 			    "but unable to remount filesystem\n"));
1931 			break;
1932 		case EZFS_SHARENFSFAILED:
1933 			(void) fprintf(stderr, gettext("property may be set "
1934 			    "but unable to reshare filesystem\n"));
1935 			break;
1936 		}
1937 		return (1);
1938 	}
1939 	cbp->cb_any_successful = B_TRUE;
1940 	return (0);
1941 }
1942 
1943 static int
1944 zfs_do_set(int argc, char **argv)
1945 {
1946 	set_cbdata_t cb;
1947 	int ret;
1948 
1949 	/* check for options */
1950 	if (argc > 1 && argv[1][0] == '-') {
1951 		(void) fprintf(stderr, gettext("invalid option '%c'\n"),
1952 		    argv[1][1]);
1953 		usage(B_FALSE);
1954 	}
1955 
1956 	/* check number of arguments */
1957 	if (argc < 2) {
1958 		(void) fprintf(stderr, gettext("missing property=value "
1959 		    "argument\n"));
1960 		usage(B_FALSE);
1961 	}
1962 	if (argc < 3) {
1963 		(void) fprintf(stderr, gettext("missing dataset name\n"));
1964 		usage(B_FALSE);
1965 	}
1966 
1967 	/* validate property=value argument */
1968 	cb.cb_propname = argv[1];
1969 	if ((cb.cb_value = strchr(cb.cb_propname, '=')) == NULL) {
1970 		(void) fprintf(stderr, gettext("missing value in "
1971 		    "property=value argument\n"));
1972 		usage(B_FALSE);
1973 	}
1974 
1975 	*cb.cb_value = '\0';
1976 	cb.cb_value++;
1977 	cb.cb_any_successful = B_FALSE;
1978 
1979 	if (*cb.cb_propname == '\0') {
1980 		(void) fprintf(stderr,
1981 		    gettext("missing property in property=value argument\n"));
1982 		usage(B_FALSE);
1983 	}
1984 
1985 	ret = zfs_for_each(argc - 2, argv + 2, B_FALSE,
1986 	    ZFS_TYPE_ANY, NULL, NULL, set_callback, &cb);
1987 
1988 	if (cb.cb_any_successful) {
1989 		*(cb.cb_value - 1) = '=';
1990 		zpool_log_history(g_zfs, argc, argv, argv[2], B_FALSE, B_FALSE);
1991 	}
1992 
1993 	return (ret);
1994 }
1995 
1996 /*
1997  * zfs snapshot [-r] <fs@snap>
1998  *
1999  * Creates a snapshot with the given name.  While functionally equivalent to
2000  * 'zfs create', it is a separate command to diffferentiate intent.
2001  */
2002 static int
2003 zfs_do_snapshot(int argc, char **argv)
2004 {
2005 	int recursive = B_FALSE;
2006 	int ret;
2007 	char c;
2008 
2009 	/* check options */
2010 	while ((c = getopt(argc, argv, ":r")) != -1) {
2011 		switch (c) {
2012 		case 'r':
2013 			recursive = B_TRUE;
2014 			break;
2015 		case '?':
2016 			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
2017 			    optopt);
2018 			usage(B_FALSE);
2019 		}
2020 	}
2021 
2022 	argc -= optind;
2023 	argv += optind;
2024 
2025 	/* check number of arguments */
2026 	if (argc < 1) {
2027 		(void) fprintf(stderr, gettext("missing snapshot argument\n"));
2028 		usage(B_FALSE);
2029 	}
2030 	if (argc > 1) {
2031 		(void) fprintf(stderr, gettext("too many arguments\n"));
2032 		usage(B_FALSE);
2033 	}
2034 
2035 	ret = zfs_snapshot(g_zfs, argv[0], recursive);
2036 	if (ret && recursive)
2037 		(void) fprintf(stderr, gettext("no snapshots were created\n"));
2038 	if (!ret) {
2039 		zpool_log_history(g_zfs, argc + optind, argv - optind, argv[0],
2040 		    B_FALSE, B_FALSE);
2041 	}
2042 	return (ret != 0);
2043 }
2044 
2045 /*
2046  * zfs send [-i <@snap>] <fs@snap>
2047  *
2048  * Send a backup stream to stdout.
2049  */
2050 static int
2051 zfs_do_send(int argc, char **argv)
2052 {
2053 	char *fromname = NULL;
2054 	char *cp;
2055 	zfs_handle_t *zhp;
2056 	int c, err;
2057 
2058 	/* check options */
2059 	while ((c = getopt(argc, argv, ":i:")) != -1) {
2060 		switch (c) {
2061 		case 'i':
2062 			if (fromname)
2063 				usage(B_FALSE);
2064 			fromname = optarg;
2065 			break;
2066 		case ':':
2067 			(void) fprintf(stderr, gettext("missing argument for "
2068 			    "'%c' option\n"), optopt);
2069 			usage(B_FALSE);
2070 			break;
2071 		case '?':
2072 			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
2073 			    optopt);
2074 			usage(B_FALSE);
2075 		}
2076 	}
2077 
2078 	argc -= optind;
2079 	argv += optind;
2080 
2081 	/* check number of arguments */
2082 	if (argc < 1) {
2083 		(void) fprintf(stderr, gettext("missing snapshot argument\n"));
2084 		usage(B_FALSE);
2085 	}
2086 	if (argc > 1) {
2087 		(void) fprintf(stderr, gettext("too many arguments\n"));
2088 		usage(B_FALSE);
2089 	}
2090 
2091 	if (isatty(STDOUT_FILENO)) {
2092 		(void) fprintf(stderr,
2093 		    gettext("Error: Stream can not be written to a terminal.\n"
2094 			    "You must redirect standard output.\n"));
2095 		return (1);
2096 	}
2097 
2098 	if ((zhp = zfs_open(g_zfs, argv[0], ZFS_TYPE_SNAPSHOT)) == NULL)
2099 		return (1);
2100 
2101 	/*
2102 	 * If they specified the full path to the snapshot, chop off
2103 	 * everything except the short name of the snapshot.
2104 	 */
2105 	if (fromname && (cp = strchr(fromname, '@')) != NULL) {
2106 		if (cp != fromname &&
2107 		    strncmp(argv[0], fromname, cp - fromname + 1)) {
2108 			(void) fprintf(stderr,
2109 			    gettext("incremental source must be "
2110 			    "in same filesystem\n"));
2111 			usage(B_FALSE);
2112 		}
2113 		fromname = cp + 1;
2114 		if (strchr(fromname, '@') || strchr(fromname, '/')) {
2115 			(void) fprintf(stderr,
2116 			    gettext("invalid incremental source\n"));
2117 			usage(B_FALSE);
2118 		}
2119 	}
2120 
2121 	err = zfs_send(zhp, fromname);
2122 	zfs_close(zhp);
2123 
2124 	return (err != 0);
2125 }
2126 
2127 /*
2128  * zfs receive <fs@snap>
2129  *
2130  * Restore a backup stream from stdin.
2131  */
2132 static int
2133 zfs_do_receive(int argc, char **argv)
2134 {
2135 	int c, err;
2136 	boolean_t isprefix = B_FALSE;
2137 	boolean_t dryrun = B_FALSE;
2138 	boolean_t verbose = B_FALSE;
2139 	boolean_t force = B_FALSE;
2140 
2141 	/* check options */
2142 	while ((c = getopt(argc, argv, ":dnvF")) != -1) {
2143 		switch (c) {
2144 		case 'd':
2145 			isprefix = B_TRUE;
2146 			break;
2147 		case 'n':
2148 			dryrun = B_TRUE;
2149 			break;
2150 		case 'v':
2151 			verbose = B_TRUE;
2152 			break;
2153 		case 'F':
2154 			force = B_TRUE;
2155 			break;
2156 		case ':':
2157 			(void) fprintf(stderr, gettext("missing argument for "
2158 			    "'%c' option\n"), optopt);
2159 			usage(B_FALSE);
2160 			break;
2161 		case '?':
2162 			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
2163 			    optopt);
2164 			usage(B_FALSE);
2165 		}
2166 	}
2167 
2168 	argc -= optind;
2169 	argv += optind;
2170 
2171 	/* check number of arguments */
2172 	if (argc < 1) {
2173 		(void) fprintf(stderr, gettext("missing snapshot argument\n"));
2174 		usage(B_FALSE);
2175 	}
2176 	if (argc > 1) {
2177 		(void) fprintf(stderr, gettext("too many arguments\n"));
2178 		usage(B_FALSE);
2179 	}
2180 
2181 	if (isatty(STDIN_FILENO)) {
2182 		(void) fprintf(stderr,
2183 		    gettext("Error: Backup stream can not be read "
2184 			    "from a terminal.\n"
2185 			    "You must redirect standard input.\n"));
2186 		return (1);
2187 	}
2188 
2189 	err = zfs_receive(g_zfs, argv[0], isprefix, verbose, dryrun, force);
2190 
2191 	if (!err) {
2192 		zpool_log_history(g_zfs, argc + optind, argv - optind, argv[0],
2193 		    B_FALSE, B_FALSE);
2194 	}
2195 
2196 	return (err != 0);
2197 }
2198 
2199 typedef struct get_all_cbdata {
2200 	zfs_handle_t	**cb_handles;
2201 	size_t		cb_alloc;
2202 	size_t		cb_used;
2203 	uint_t		cb_types;
2204 } get_all_cbdata_t;
2205 
2206 static int
2207 get_one_dataset(zfs_handle_t *zhp, void *data)
2208 {
2209 	get_all_cbdata_t *cbp = data;
2210 	zfs_type_t type = zfs_get_type(zhp);
2211 
2212 	/*
2213 	 * Interate over any nested datasets.
2214 	 */
2215 	if (type == ZFS_TYPE_FILESYSTEM &&
2216 	    zfs_iter_filesystems(zhp, get_one_dataset, data) != 0) {
2217 		zfs_close(zhp);
2218 		return (1);
2219 	}
2220 
2221 	/*
2222 	 * Skip any datasets whose type does not match.
2223 	 */
2224 	if ((type & cbp->cb_types) == 0) {
2225 		zfs_close(zhp);
2226 		return (0);
2227 	}
2228 
2229 	if (cbp->cb_alloc == cbp->cb_used) {
2230 		zfs_handle_t **handles;
2231 
2232 		if (cbp->cb_alloc == 0)
2233 			cbp->cb_alloc = 64;
2234 		else
2235 			cbp->cb_alloc *= 2;
2236 
2237 		handles = safe_malloc(cbp->cb_alloc * sizeof (void *));
2238 
2239 		if (cbp->cb_handles) {
2240 			bcopy(cbp->cb_handles, handles,
2241 			    cbp->cb_used * sizeof (void *));
2242 			free(cbp->cb_handles);
2243 		}
2244 
2245 		cbp->cb_handles = handles;
2246 	}
2247 
2248 	cbp->cb_handles[cbp->cb_used++] = zhp;
2249 
2250 	return (0);
2251 }
2252 
2253 static void
2254 get_all_datasets(uint_t types, zfs_handle_t ***dslist, size_t *count)
2255 {
2256 	get_all_cbdata_t cb = { 0 };
2257 	cb.cb_types = types;
2258 
2259 	(void) zfs_iter_root(g_zfs, get_one_dataset, &cb);
2260 
2261 	*dslist = cb.cb_handles;
2262 	*count = cb.cb_used;
2263 }
2264 
2265 static int
2266 dataset_cmp(const void *a, const void *b)
2267 {
2268 	zfs_handle_t **za = (zfs_handle_t **)a;
2269 	zfs_handle_t **zb = (zfs_handle_t **)b;
2270 	char mounta[MAXPATHLEN];
2271 	char mountb[MAXPATHLEN];
2272 	boolean_t gota, gotb;
2273 
2274 	if ((gota = (zfs_get_type(*za) == ZFS_TYPE_FILESYSTEM)) != 0)
2275 		verify(zfs_prop_get(*za, ZFS_PROP_MOUNTPOINT, mounta,
2276 		    sizeof (mounta), NULL, NULL, 0, B_FALSE) == 0);
2277 	if ((gotb = (zfs_get_type(*zb) == ZFS_TYPE_FILESYSTEM)) != 0)
2278 		verify(zfs_prop_get(*zb, ZFS_PROP_MOUNTPOINT, mountb,
2279 		    sizeof (mountb), NULL, NULL, 0, B_FALSE) == 0);
2280 
2281 	if (gota && gotb)
2282 		return (strcmp(mounta, mountb));
2283 
2284 	if (gota)
2285 		return (-1);
2286 	if (gotb)
2287 		return (1);
2288 
2289 	return (strcmp(zfs_get_name(a), zfs_get_name(b)));
2290 }
2291 
2292 /*
2293  * Generic callback for sharing or mounting filesystems.  Because the code is so
2294  * similar, we have a common function with an extra parameter to determine which
2295  * mode we are using.
2296  */
2297 #define	OP_SHARE	0x1
2298 #define	OP_MOUNT	0x2
2299 
2300 /*
2301  * Share or mount a dataset.
2302  */
2303 static int
2304 share_mount_one(zfs_handle_t *zhp, int op, int flags, boolean_t explicit,
2305     const char *options)
2306 {
2307 	char mountpoint[ZFS_MAXPROPLEN];
2308 	char shareopts[ZFS_MAXPROPLEN];
2309 	const char *cmdname = op == OP_SHARE ? "share" : "mount";
2310 	struct mnttab mnt;
2311 	uint64_t zoned, canmount;
2312 	zfs_type_t type = zfs_get_type(zhp);
2313 
2314 	assert(type & (ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME));
2315 
2316 	if (type == ZFS_TYPE_FILESYSTEM) {
2317 		/*
2318 		 * Check to make sure we can mount/share this dataset.  If we
2319 		 * are in the global zone and the filesystem is exported to a
2320 		 * local zone, or if we are in a local zone and the
2321 		 * filesystem is not exported, then it is an error.
2322 		 */
2323 		zoned = zfs_prop_get_int(zhp, ZFS_PROP_ZONED);
2324 
2325 		if (zoned && getzoneid() == GLOBAL_ZONEID) {
2326 			if (!explicit)
2327 				return (0);
2328 
2329 			(void) fprintf(stderr, gettext("cannot %s '%s': "
2330 			    "dataset is exported to a local zone\n"), cmdname,
2331 			    zfs_get_name(zhp));
2332 			return (1);
2333 
2334 		} else if (!zoned && getzoneid() != GLOBAL_ZONEID) {
2335 			if (!explicit)
2336 				return (0);
2337 
2338 			(void) fprintf(stderr, gettext("cannot %s '%s': "
2339 			    "permission denied\n"), cmdname,
2340 			    zfs_get_name(zhp));
2341 			return (1);
2342 		}
2343 
2344 		/*
2345 		 * Ignore any filesystems which don't apply to us. This
2346 		 * includes those with a legacy mountpoint, or those with
2347 		 * legacy share options.
2348 		 */
2349 		verify(zfs_prop_get(zhp, ZFS_PROP_MOUNTPOINT, mountpoint,
2350 		    sizeof (mountpoint), NULL, NULL, 0, B_FALSE) == 0);
2351 		verify(zfs_prop_get(zhp, ZFS_PROP_SHARENFS, shareopts,
2352 		    sizeof (shareopts), NULL, NULL, 0, B_FALSE) == 0);
2353 		canmount = zfs_prop_get_int(zhp, ZFS_PROP_CANMOUNT);
2354 
2355 		if (op == OP_SHARE && strcmp(shareopts, "off") == 0) {
2356 			if (!explicit)
2357 				return (0);
2358 
2359 			(void) fprintf(stderr, gettext("cannot share '%s': "
2360 			    "legacy share\n"), zfs_get_name(zhp));
2361 			(void) fprintf(stderr, gettext("use share(1M) to "
2362 			    "share this filesystem\n"));
2363 			return (1);
2364 		}
2365 
2366 		/*
2367 		 * We cannot share or mount legacy filesystems. If the
2368 		 * shareopts is non-legacy but the mountpoint is legacy, we
2369 		 * treat it as a legacy share.
2370 		 */
2371 		if (strcmp(mountpoint, "legacy") == 0) {
2372 			if (!explicit)
2373 				return (0);
2374 
2375 			(void) fprintf(stderr, gettext("cannot %s '%s': "
2376 			    "legacy mountpoint\n"), cmdname, zfs_get_name(zhp));
2377 			(void) fprintf(stderr, gettext("use %s to "
2378 			    "%s this filesystem\n"), op == OP_SHARE ?
2379 			    "share(1M)" : "mount(1M)", cmdname);
2380 			return (1);
2381 		}
2382 
2383 		if (strcmp(mountpoint, "none") == 0) {
2384 			if (!explicit)
2385 				return (0);
2386 
2387 			(void) fprintf(stderr, gettext("cannot %s '%s': no "
2388 			    "mountpoint set\n"), cmdname, zfs_get_name(zhp));
2389 			return (1);
2390 		}
2391 
2392 		if (!canmount) {
2393 			if (!explicit)
2394 				return (0);
2395 
2396 			(void) fprintf(stderr, gettext("cannot %s '%s': "
2397 			    "'canmount' property is set to 'off'\n"), cmdname,
2398 			    zfs_get_name(zhp));
2399 			return (1);
2400 		}
2401 
2402 		/*
2403 		 * At this point, we have verified that the mountpoint and/or
2404 		 * shareopts are appropriate for auto management. If the
2405 		 * filesystem is already mounted or shared, return (failing
2406 		 * for explicit requests); otherwise mount or share the
2407 		 * filesystem.
2408 		 */
2409 		switch (op) {
2410 		case OP_SHARE:
2411 			if (zfs_is_shared_nfs(zhp, NULL)) {
2412 				if (!explicit)
2413 					return (0);
2414 
2415 				(void) fprintf(stderr, gettext("cannot share "
2416 				    "'%s': filesystem already shared\n"),
2417 				    zfs_get_name(zhp));
2418 				return (1);
2419 			}
2420 
2421 			if (!zfs_is_mounted(zhp, NULL) &&
2422 			    zfs_mount(zhp, NULL, 0) != 0)
2423 				return (1);
2424 
2425 			if (zfs_share_nfs(zhp) != 0)
2426 				return (1);
2427 			break;
2428 
2429 		case OP_MOUNT:
2430 			if (options == NULL)
2431 				mnt.mnt_mntopts = "";
2432 			else
2433 				mnt.mnt_mntopts = (char *)options;
2434 
2435 			if (!hasmntopt(&mnt, MNTOPT_REMOUNT) &&
2436 			    zfs_is_mounted(zhp, NULL)) {
2437 				if (!explicit)
2438 					return (0);
2439 
2440 				(void) fprintf(stderr, gettext("cannot mount "
2441 				    "'%s': filesystem already mounted\n"),
2442 				    zfs_get_name(zhp));
2443 				return (1);
2444 			}
2445 
2446 			if (zfs_mount(zhp, options, flags) != 0)
2447 				return (1);
2448 			break;
2449 		}
2450 	} else {
2451 		assert(op == OP_SHARE);
2452 
2453 		/*
2454 		 * Ignore any volumes that aren't shared.
2455 		 */
2456 		verify(zfs_prop_get(zhp, ZFS_PROP_SHAREISCSI, shareopts,
2457 		    sizeof (shareopts), NULL, NULL, 0, B_FALSE) == 0);
2458 
2459 		if (strcmp(shareopts, "off") == 0) {
2460 			if (!explicit)
2461 				return (0);
2462 
2463 			(void) fprintf(stderr, gettext("cannot share '%s': "
2464 			    "'shareiscsi' property not set\n"),
2465 			    zfs_get_name(zhp));
2466 			(void) fprintf(stderr, gettext("set 'shareiscsi' "
2467 			    "property or use iscsitadm(1M) to share this "
2468 			    "volume\n"));
2469 			return (1);
2470 		}
2471 
2472 		if (zfs_is_shared_iscsi(zhp)) {
2473 			if (!explicit)
2474 				return (0);
2475 
2476 			(void) fprintf(stderr, gettext("cannot share "
2477 			    "'%s': volume already shared\n"),
2478 			    zfs_get_name(zhp));
2479 			return (1);
2480 		}
2481 
2482 		if (zfs_share_iscsi(zhp) != 0)
2483 			return (1);
2484 	}
2485 
2486 	return (0);
2487 }
2488 
2489 static int
2490 share_mount(int op, int argc, char **argv)
2491 {
2492 	int do_all = 0;
2493 	int c, ret = 0;
2494 	const char *options = NULL;
2495 	int types, flags = 0;
2496 
2497 	/* check options */
2498 	while ((c = getopt(argc, argv, op == OP_MOUNT ? ":ao:O" : "a"))
2499 	    != -1) {
2500 		switch (c) {
2501 		case 'a':
2502 			do_all = 1;
2503 			break;
2504 		case 'o':
2505 			options = optarg;
2506 			break;
2507 		case 'O':
2508 			flags |= MS_OVERLAY;
2509 			break;
2510 		case ':':
2511 			(void) fprintf(stderr, gettext("missing argument for "
2512 			    "'%c' option\n"), optopt);
2513 			usage(B_FALSE);
2514 			break;
2515 		case '?':
2516 			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
2517 			    optopt);
2518 			usage(B_FALSE);
2519 		}
2520 	}
2521 
2522 	argc -= optind;
2523 	argv += optind;
2524 
2525 	/* check number of arguments */
2526 	if (do_all) {
2527 		zfs_handle_t **dslist = NULL;
2528 		size_t i, count = 0;
2529 
2530 		if (op == OP_MOUNT) {
2531 			types = ZFS_TYPE_FILESYSTEM;
2532 		} else if (argc > 0) {
2533 			if (strcmp(argv[0], "nfs") == 0) {
2534 				types = ZFS_TYPE_FILESYSTEM;
2535 			} else if (strcmp(argv[0], "iscsi") == 0) {
2536 				types = ZFS_TYPE_VOLUME;
2537 			} else {
2538 				(void) fprintf(stderr, gettext("share type "
2539 				    "must be 'nfs' or 'iscsi'\n"));
2540 				usage(B_FALSE);
2541 			}
2542 
2543 			argc--;
2544 			argv++;
2545 		} else {
2546 			types = ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME;
2547 		}
2548 
2549 		if (argc != 0) {
2550 			(void) fprintf(stderr, gettext("too many arguments\n"));
2551 			usage(B_FALSE);
2552 		}
2553 
2554 		get_all_datasets(types, &dslist, &count);
2555 
2556 		if (count == 0)
2557 			return (0);
2558 
2559 		qsort(dslist, count, sizeof (void *), dataset_cmp);
2560 
2561 		for (i = 0; i < count; i++) {
2562 			if (share_mount_one(dslist[i], op, flags, B_FALSE,
2563 			    options) != 0)
2564 				ret = 1;
2565 			zfs_close(dslist[i]);
2566 		}
2567 
2568 		free(dslist);
2569 	} else if (argc == 0) {
2570 		struct mnttab entry;
2571 
2572 		if (op == OP_SHARE) {
2573 			(void) fprintf(stderr, gettext("missing filesystem "
2574 			    "argument\n"));
2575 			usage(B_FALSE);
2576 		}
2577 
2578 		/*
2579 		 * When mount is given no arguments, go through /etc/mnttab and
2580 		 * display any active ZFS mounts.  We hide any snapshots, since
2581 		 * they are controlled automatically.
2582 		 */
2583 		rewind(mnttab_file);
2584 		while (getmntent(mnttab_file, &entry) == 0) {
2585 			if (strcmp(entry.mnt_fstype, MNTTYPE_ZFS) != 0 ||
2586 			    strchr(entry.mnt_special, '@') != NULL)
2587 				continue;
2588 
2589 			(void) printf("%-30s  %s\n", entry.mnt_special,
2590 			    entry.mnt_mountp);
2591 		}
2592 
2593 	} else {
2594 		zfs_handle_t *zhp;
2595 
2596 		types = ZFS_TYPE_FILESYSTEM;
2597 		if (op == OP_SHARE)
2598 			types |= ZFS_TYPE_VOLUME;
2599 
2600 		if (argc > 1) {
2601 			(void) fprintf(stderr,
2602 			    gettext("too many arguments\n"));
2603 			usage(B_FALSE);
2604 		}
2605 
2606 		if ((zhp = zfs_open(g_zfs, argv[0], types)) == NULL) {
2607 			ret = 1;
2608 		} else {
2609 			ret = share_mount_one(zhp, op, flags, B_TRUE,
2610 			    options);
2611 			zfs_close(zhp);
2612 		}
2613 	}
2614 
2615 	return (ret);
2616 }
2617 
2618 /*
2619  * zfs mount -a [nfs | iscsi]
2620  * zfs mount filesystem
2621  *
2622  * Mount all filesystems, or mount the given filesystem.
2623  */
2624 static int
2625 zfs_do_mount(int argc, char **argv)
2626 {
2627 	return (share_mount(OP_MOUNT, argc, argv));
2628 }
2629 
2630 /*
2631  * zfs share -a [nfs | iscsi]
2632  * zfs share filesystem
2633  *
2634  * Share all filesystems, or share the given filesystem.
2635  */
2636 static int
2637 zfs_do_share(int argc, char **argv)
2638 {
2639 	return (share_mount(OP_SHARE, argc, argv));
2640 }
2641 
2642 typedef struct unshare_unmount_node {
2643 	zfs_handle_t	*un_zhp;
2644 	char		*un_mountp;
2645 	uu_avl_node_t	un_avlnode;
2646 } unshare_unmount_node_t;
2647 
2648 /* ARGSUSED */
2649 static int
2650 unshare_unmount_compare(const void *larg, const void *rarg, void *unused)
2651 {
2652 	const unshare_unmount_node_t *l = larg;
2653 	const unshare_unmount_node_t *r = rarg;
2654 
2655 	return (strcmp(l->un_mountp, r->un_mountp));
2656 }
2657 
2658 /*
2659  * Convenience routine used by zfs_do_umount() and manual_unmount().  Given an
2660  * absolute path, find the entry /etc/mnttab, verify that its a ZFS filesystem,
2661  * and unmount it appropriately.
2662  */
2663 static int
2664 unshare_unmount_path(int op, char *path, int flags, boolean_t is_manual)
2665 {
2666 	zfs_handle_t *zhp;
2667 	int ret;
2668 	struct stat64 statbuf;
2669 	struct extmnttab entry;
2670 	const char *cmdname = (op == OP_SHARE) ? "unshare" : "unmount";
2671 	char property[ZFS_MAXPROPLEN];
2672 
2673 	/*
2674 	 * Search for the path in /etc/mnttab.  Rather than looking for the
2675 	 * specific path, which can be fooled by non-standard paths (i.e. ".."
2676 	 * or "//"), we stat() the path and search for the corresponding
2677 	 * (major,minor) device pair.
2678 	 */
2679 	if (stat64(path, &statbuf) != 0) {
2680 		(void) fprintf(stderr, gettext("cannot %s '%s': %s\n"),
2681 		    cmdname, path, strerror(errno));
2682 		return (1);
2683 	}
2684 
2685 	/*
2686 	 * Search for the given (major,minor) pair in the mount table.
2687 	 */
2688 	rewind(mnttab_file);
2689 	while ((ret = getextmntent(mnttab_file, &entry, 0)) == 0) {
2690 		if (entry.mnt_major == major(statbuf.st_dev) &&
2691 		    entry.mnt_minor == minor(statbuf.st_dev))
2692 			break;
2693 	}
2694 	if (ret != 0) {
2695 		(void) fprintf(stderr, gettext("cannot %s '%s': not "
2696 		    "currently mounted\n"), cmdname, path);
2697 		return (1);
2698 	}
2699 
2700 	if (strcmp(entry.mnt_fstype, MNTTYPE_ZFS) != 0) {
2701 		(void) fprintf(stderr, gettext("cannot %s '%s': not a ZFS "
2702 		    "filesystem\n"), cmdname, path);
2703 		return (1);
2704 	}
2705 
2706 	if ((zhp = zfs_open(g_zfs, entry.mnt_special,
2707 	    ZFS_TYPE_FILESYSTEM)) == NULL)
2708 		return (1);
2709 
2710 	verify(zfs_prop_get(zhp, op == OP_SHARE ?
2711 		ZFS_PROP_SHARENFS : ZFS_PROP_MOUNTPOINT, property,
2712 		sizeof (property), NULL, NULL, 0, B_FALSE) == 0);
2713 
2714 	if (op == OP_SHARE) {
2715 		if (strcmp(property, "off") == 0) {
2716 			(void) fprintf(stderr, gettext("cannot unshare "
2717 			    "'%s': legacy share\n"), path);
2718 			(void) fprintf(stderr, gettext("use "
2719 			    "unshare(1M) to unshare this filesystem\n"));
2720 			ret = 1;
2721 		} else if (!zfs_is_shared_nfs(zhp, NULL)) {
2722 			(void) fprintf(stderr, gettext("cannot unshare '%s': "
2723 			    "not currently shared\n"), path);
2724 			ret = 1;
2725 		} else {
2726 			ret = zfs_unshareall_nfs(zhp);
2727 		}
2728 	} else {
2729 		if (is_manual) {
2730 			ret = zfs_unmount(zhp, NULL, flags);
2731 		} else if (strcmp(property, "legacy") == 0) {
2732 			(void) fprintf(stderr, gettext("cannot unmount "
2733 			    "'%s': legacy mountpoint\n"),
2734 			    zfs_get_name(zhp));
2735 			(void) fprintf(stderr, gettext("use umount(1M) "
2736 			    "to unmount this filesystem\n"));
2737 			ret = 1;
2738 		} else {
2739 			ret = zfs_unmountall(zhp, flags);
2740 		}
2741 	}
2742 
2743 	zfs_close(zhp);
2744 
2745 	return (ret != 0);
2746 }
2747 
2748 /*
2749  * Generic callback for unsharing or unmounting a filesystem.
2750  */
2751 static int
2752 unshare_unmount(int op, int argc, char **argv)
2753 {
2754 	int do_all = 0;
2755 	int flags = 0;
2756 	int ret = 0;
2757 	int types, c;
2758 	zfs_handle_t *zhp;
2759 	char property[ZFS_MAXPROPLEN];
2760 
2761 	/* check options */
2762 	while ((c = getopt(argc, argv, op == OP_SHARE ? "a" : "af")) != -1) {
2763 		switch (c) {
2764 		case 'a':
2765 			do_all = 1;
2766 			break;
2767 		case 'f':
2768 			flags = MS_FORCE;
2769 			break;
2770 		case '?':
2771 			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
2772 			    optopt);
2773 			usage(B_FALSE);
2774 		}
2775 	}
2776 
2777 	argc -= optind;
2778 	argv += optind;
2779 
2780 	if (do_all) {
2781 		/*
2782 		 * We could make use of zfs_for_each() to walk all datasets in
2783 		 * the system, but this would be very inefficient, especially
2784 		 * since we would have to linearly search /etc/mnttab for each
2785 		 * one.  Instead, do one pass through /etc/mnttab looking for
2786 		 * zfs entries and call zfs_unmount() for each one.
2787 		 *
2788 		 * Things get a little tricky if the administrator has created
2789 		 * mountpoints beneath other ZFS filesystems.  In this case, we
2790 		 * have to unmount the deepest filesystems first.  To accomplish
2791 		 * this, we place all the mountpoints in an AVL tree sorted by
2792 		 * the special type (dataset name), and walk the result in
2793 		 * reverse to make sure to get any snapshots first.
2794 		 */
2795 		struct mnttab entry;
2796 		uu_avl_pool_t *pool;
2797 		uu_avl_t *tree;
2798 		unshare_unmount_node_t *node;
2799 		uu_avl_index_t idx;
2800 		uu_avl_walk_t *walk;
2801 
2802 		if (argc != 0) {
2803 			(void) fprintf(stderr, gettext("too many arguments\n"));
2804 			usage(B_FALSE);
2805 		}
2806 
2807 		if ((pool = uu_avl_pool_create("unmount_pool",
2808 		    sizeof (unshare_unmount_node_t),
2809 		    offsetof(unshare_unmount_node_t, un_avlnode),
2810 		    unshare_unmount_compare,
2811 		    UU_DEFAULT)) == NULL) {
2812 			(void) fprintf(stderr, gettext("internal error: "
2813 			    "out of memory\n"));
2814 			exit(1);
2815 		}
2816 
2817 		if ((tree = uu_avl_create(pool, NULL, UU_DEFAULT)) == NULL) {
2818 			(void) fprintf(stderr, gettext("internal error: "
2819 			    "out of memory\n"));
2820 			exit(1);
2821 		}
2822 
2823 		rewind(mnttab_file);
2824 		while (getmntent(mnttab_file, &entry) == 0) {
2825 
2826 			/* ignore non-ZFS entries */
2827 			if (strcmp(entry.mnt_fstype, MNTTYPE_ZFS) != 0)
2828 				continue;
2829 
2830 			/* ignore snapshots */
2831 			if (strchr(entry.mnt_special, '@') != NULL)
2832 				continue;
2833 
2834 			if ((zhp = zfs_open(g_zfs, entry.mnt_special,
2835 			    ZFS_TYPE_FILESYSTEM)) == NULL) {
2836 				ret = 1;
2837 				continue;
2838 			}
2839 
2840 			verify(zfs_prop_get(zhp, op == OP_SHARE ?
2841 			    ZFS_PROP_SHARENFS : ZFS_PROP_MOUNTPOINT,
2842 			    property, sizeof (property), NULL, NULL,
2843 			    0, B_FALSE) == 0);
2844 
2845 			/* Ignore legacy mounts and shares */
2846 			if ((op == OP_SHARE &&
2847 			    strcmp(property, "off") == 0) ||
2848 			    (op == OP_MOUNT &&
2849 			    strcmp(property, "legacy") == 0)) {
2850 				zfs_close(zhp);
2851 				continue;
2852 			}
2853 
2854 			node = safe_malloc(sizeof (unshare_unmount_node_t));
2855 			node->un_zhp = zhp;
2856 
2857 			if ((node->un_mountp = strdup(entry.mnt_mountp)) ==
2858 			    NULL) {
2859 				(void) fprintf(stderr, gettext("internal error:"
2860 				    " out of memory\n"));
2861 				exit(1);
2862 			}
2863 
2864 			uu_avl_node_init(node, &node->un_avlnode, pool);
2865 
2866 			if (uu_avl_find(tree, node, NULL, &idx) == NULL) {
2867 				uu_avl_insert(tree, node, idx);
2868 			} else {
2869 				zfs_close(node->un_zhp);
2870 				free(node->un_mountp);
2871 				free(node);
2872 			}
2873 		}
2874 
2875 		/*
2876 		 * Walk the AVL tree in reverse, unmounting each filesystem and
2877 		 * removing it from the AVL tree in the process.
2878 		 */
2879 		if ((walk = uu_avl_walk_start(tree,
2880 		    UU_WALK_REVERSE | UU_WALK_ROBUST)) == NULL) {
2881 			(void) fprintf(stderr,
2882 			    gettext("internal error: out of memory"));
2883 			exit(1);
2884 		}
2885 
2886 		while ((node = uu_avl_walk_next(walk)) != NULL) {
2887 			uu_avl_remove(tree, node);
2888 
2889 			switch (op) {
2890 			case OP_SHARE:
2891 				if (zfs_unshare_nfs(node->un_zhp,
2892 				    node->un_mountp) != 0)
2893 					ret = 1;
2894 				break;
2895 
2896 			case OP_MOUNT:
2897 				if (zfs_unmount(node->un_zhp,
2898 				    node->un_mountp, flags) != 0)
2899 					ret = 1;
2900 				break;
2901 			}
2902 
2903 			zfs_close(node->un_zhp);
2904 			free(node->un_mountp);
2905 			free(node);
2906 		}
2907 
2908 		uu_avl_walk_end(walk);
2909 		uu_avl_destroy(tree);
2910 		uu_avl_pool_destroy(pool);
2911 
2912 		if (op == OP_SHARE) {
2913 			/*
2914 			 * Finally, unshare any volumes shared via iSCSI.
2915 			 */
2916 			zfs_handle_t **dslist = NULL;
2917 			size_t i, count = 0;
2918 
2919 			get_all_datasets(ZFS_TYPE_VOLUME, &dslist, &count);
2920 
2921 			if (count != 0) {
2922 				qsort(dslist, count, sizeof (void *),
2923 				    dataset_cmp);
2924 
2925 				for (i = 0; i < count; i++) {
2926 					if (zfs_unshare_iscsi(dslist[i]) != 0)
2927 						ret = 1;
2928 					zfs_close(dslist[i]);
2929 				}
2930 
2931 				free(dslist);
2932 			}
2933 		}
2934 	} else {
2935 		if (argc != 1) {
2936 			if (argc == 0)
2937 				(void) fprintf(stderr,
2938 				    gettext("missing filesystem argument\n"));
2939 			else
2940 				(void) fprintf(stderr,
2941 				    gettext("too many arguments\n"));
2942 			usage(B_FALSE);
2943 		}
2944 
2945 		/*
2946 		 * We have an argument, but it may be a full path or a ZFS
2947 		 * filesystem.  Pass full paths off to unmount_path() (shared by
2948 		 * manual_unmount), otherwise open the filesystem and pass to
2949 		 * zfs_unmount().
2950 		 */
2951 		if (argv[0][0] == '/')
2952 			return (unshare_unmount_path(op, argv[0],
2953 				flags, B_FALSE));
2954 
2955 		types = ZFS_TYPE_FILESYSTEM;
2956 		if (op == OP_SHARE)
2957 			types |= ZFS_TYPE_VOLUME;
2958 
2959 		if ((zhp = zfs_open(g_zfs, argv[0], types)) == NULL)
2960 			return (1);
2961 
2962 		if (zfs_get_type(zhp) == ZFS_TYPE_FILESYSTEM) {
2963 			verify(zfs_prop_get(zhp, op == OP_SHARE ?
2964 			    ZFS_PROP_SHARENFS : ZFS_PROP_MOUNTPOINT, property,
2965 			    sizeof (property), NULL, NULL, 0, B_FALSE) == 0);
2966 
2967 			switch (op) {
2968 			case OP_SHARE:
2969 				if (strcmp(property, "off") == 0) {
2970 					(void) fprintf(stderr, gettext("cannot "
2971 					    "unshare '%s': legacy share\n"),
2972 					    zfs_get_name(zhp));
2973 					(void) fprintf(stderr, gettext("use "
2974 					    "unshare(1M) to unshare this "
2975 					    "filesystem\n"));
2976 					ret = 1;
2977 				} else if (!zfs_is_shared_nfs(zhp, NULL)) {
2978 					(void) fprintf(stderr, gettext("cannot "
2979 					    "unshare '%s': not currently "
2980 					    "shared\n"), zfs_get_name(zhp));
2981 					ret = 1;
2982 				} else if (zfs_unshareall_nfs(zhp) != 0) {
2983 					ret = 1;
2984 				}
2985 				break;
2986 
2987 			case OP_MOUNT:
2988 				if (strcmp(property, "legacy") == 0) {
2989 					(void) fprintf(stderr, gettext("cannot "
2990 					    "unmount '%s': legacy "
2991 					    "mountpoint\n"), zfs_get_name(zhp));
2992 					(void) fprintf(stderr, gettext("use "
2993 					    "umount(1M) to unmount this "
2994 					    "filesystem\n"));
2995 					ret = 1;
2996 				} else if (!zfs_is_mounted(zhp, NULL)) {
2997 					(void) fprintf(stderr, gettext("cannot "
2998 					    "unmount '%s': not currently "
2999 					    "mounted\n"),
3000 					    zfs_get_name(zhp));
3001 					ret = 1;
3002 				} else if (zfs_unmountall(zhp, flags) != 0) {
3003 					ret = 1;
3004 				}
3005 				break;
3006 			}
3007 		} else {
3008 			assert(op == OP_SHARE);
3009 
3010 			verify(zfs_prop_get(zhp, ZFS_PROP_SHAREISCSI, property,
3011 			    sizeof (property), NULL, NULL, 0, B_FALSE) == 0);
3012 
3013 			if (strcmp(property, "off") == 0) {
3014 				(void) fprintf(stderr, gettext("cannot unshare "
3015 				    "'%s': 'shareiscsi' property not set\n"),
3016 				    zfs_get_name(zhp));
3017 				(void) fprintf(stderr, gettext("set "
3018 				    "'shareiscsi' property or use "
3019 				    "iscsitadm(1M) to share this volume\n"));
3020 				ret = 1;
3021 			} else if (!zfs_is_shared_iscsi(zhp)) {
3022 				(void) fprintf(stderr, gettext("cannot "
3023 				    "unshare '%s': not currently shared\n"),
3024 				    zfs_get_name(zhp));
3025 				ret = 1;
3026 			} else if (zfs_unshare_iscsi(zhp) != 0) {
3027 				ret = 1;
3028 			}
3029 		}
3030 
3031 		zfs_close(zhp);
3032 	}
3033 
3034 	return (ret);
3035 }
3036 
3037 /*
3038  * zfs unmount -a
3039  * zfs unmount filesystem
3040  *
3041  * Unmount all filesystems, or a specific ZFS filesystem.
3042  */
3043 static int
3044 zfs_do_unmount(int argc, char **argv)
3045 {
3046 	return (unshare_unmount(OP_MOUNT, argc, argv));
3047 }
3048 
3049 /*
3050  * zfs unshare -a
3051  * zfs unshare filesystem
3052  *
3053  * Unshare all filesystems, or a specific ZFS filesystem.
3054  */
3055 static int
3056 zfs_do_unshare(int argc, char **argv)
3057 {
3058 	return (unshare_unmount(OP_SHARE, argc, argv));
3059 }
3060 
3061 /*
3062  * Called when invoked as /etc/fs/zfs/mount.  Do the mount if the mountpoint is
3063  * 'legacy'.  Otherwise, complain that use should be using 'zfs mount'.
3064  */
3065 static int
3066 manual_mount(int argc, char **argv)
3067 {
3068 	zfs_handle_t *zhp;
3069 	char mountpoint[ZFS_MAXPROPLEN];
3070 	char mntopts[MNT_LINE_MAX] = { '\0' };
3071 	int ret;
3072 	int c;
3073 	int flags = 0;
3074 	char *dataset, *path;
3075 
3076 	/* check options */
3077 	while ((c = getopt(argc, argv, ":mo:O")) != -1) {
3078 		switch (c) {
3079 		case 'o':
3080 			(void) strlcpy(mntopts, optarg, sizeof (mntopts));
3081 			break;
3082 		case 'O':
3083 			flags |= MS_OVERLAY;
3084 			break;
3085 		case 'm':
3086 			flags |= MS_NOMNTTAB;
3087 			break;
3088 		case ':':
3089 			(void) fprintf(stderr, gettext("missing argument for "
3090 			    "'%c' option\n"), optopt);
3091 			usage(B_FALSE);
3092 			break;
3093 		case '?':
3094 			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
3095 			    optopt);
3096 			(void) fprintf(stderr, gettext("usage: mount [-o opts] "
3097 			    "<path>\n"));
3098 			return (2);
3099 		}
3100 	}
3101 
3102 	argc -= optind;
3103 	argv += optind;
3104 
3105 	/* check that we only have two arguments */
3106 	if (argc != 2) {
3107 		if (argc == 0)
3108 			(void) fprintf(stderr, gettext("missing dataset "
3109 			    "argument\n"));
3110 		else if (argc == 1)
3111 			(void) fprintf(stderr,
3112 			    gettext("missing mountpoint argument\n"));
3113 		else
3114 			(void) fprintf(stderr, gettext("too many arguments\n"));
3115 		(void) fprintf(stderr, "usage: mount <dataset> <mountpoint>\n");
3116 		return (2);
3117 	}
3118 
3119 	dataset = argv[0];
3120 	path = argv[1];
3121 
3122 	/* try to open the dataset */
3123 	if ((zhp = zfs_open(g_zfs, dataset, ZFS_TYPE_FILESYSTEM)) == NULL)
3124 		return (1);
3125 
3126 	(void) zfs_prop_get(zhp, ZFS_PROP_MOUNTPOINT, mountpoint,
3127 	    sizeof (mountpoint), NULL, NULL, 0, B_FALSE);
3128 
3129 	/* check for legacy mountpoint and complain appropriately */
3130 	ret = 0;
3131 	if (strcmp(mountpoint, ZFS_MOUNTPOINT_LEGACY) == 0) {
3132 		if (mount(dataset, path, MS_OPTIONSTR | flags, MNTTYPE_ZFS,
3133 		    NULL, 0, mntopts, sizeof (mntopts)) != 0) {
3134 			(void) fprintf(stderr, gettext("mount failed: %s\n"),
3135 			    strerror(errno));
3136 			ret = 1;
3137 		}
3138 	} else {
3139 		(void) fprintf(stderr, gettext("filesystem '%s' cannot be "
3140 		    "mounted using 'mount -F zfs'\n"), dataset);
3141 		(void) fprintf(stderr, gettext("Use 'zfs set mountpoint=%s' "
3142 		    "instead.\n"), path);
3143 		(void) fprintf(stderr, gettext("If you must use 'mount -F zfs' "
3144 		    "or /etc/vfstab, use 'zfs set mountpoint=legacy'.\n"));
3145 		(void) fprintf(stderr, gettext("See zfs(1M) for more "
3146 		    "information.\n"));
3147 		ret = 1;
3148 	}
3149 
3150 	return (ret);
3151 }
3152 
3153 /*
3154  * Called when invoked as /etc/fs/zfs/umount.  Unlike a manual mount, we allow
3155  * unmounts of non-legacy filesystems, as this is the dominant administrative
3156  * interface.
3157  */
3158 static int
3159 manual_unmount(int argc, char **argv)
3160 {
3161 	int flags = 0;
3162 	int c;
3163 
3164 	/* check options */
3165 	while ((c = getopt(argc, argv, "f")) != -1) {
3166 		switch (c) {
3167 		case 'f':
3168 			flags = MS_FORCE;
3169 			break;
3170 		case '?':
3171 			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
3172 			    optopt);
3173 			(void) fprintf(stderr, gettext("usage: unmount [-f] "
3174 			    "<path>\n"));
3175 			return (2);
3176 		}
3177 	}
3178 
3179 	argc -= optind;
3180 	argv += optind;
3181 
3182 	/* check arguments */
3183 	if (argc != 1) {
3184 		if (argc == 0)
3185 			(void) fprintf(stderr, gettext("missing path "
3186 			    "argument\n"));
3187 		else
3188 			(void) fprintf(stderr, gettext("too many arguments\n"));
3189 		(void) fprintf(stderr, gettext("usage: unmount [-f] <path>\n"));
3190 		return (2);
3191 	}
3192 
3193 	return (unshare_unmount_path(OP_MOUNT, argv[0], flags, B_TRUE));
3194 }
3195 
3196 static int
3197 volcheck(zpool_handle_t *zhp, void *data)
3198 {
3199 	boolean_t isinit = *((boolean_t *)data);
3200 
3201 	if (isinit)
3202 		return (zpool_create_zvol_links(zhp));
3203 	else
3204 		return (zpool_remove_zvol_links(zhp));
3205 }
3206 
3207 /*
3208  * Iterate over all pools in the system and either create or destroy /dev/zvol
3209  * links, depending on the value of 'isinit'.
3210  */
3211 static int
3212 do_volcheck(boolean_t isinit)
3213 {
3214 	return (zpool_iter(g_zfs, volcheck, &isinit) ? 1 : 0);
3215 }
3216 
3217 int
3218 main(int argc, char **argv)
3219 {
3220 	int ret;
3221 	int i;
3222 	char *progname;
3223 	char *cmdname;
3224 
3225 	(void) setlocale(LC_ALL, "");
3226 	(void) textdomain(TEXT_DOMAIN);
3227 
3228 	opterr = 0;
3229 
3230 	if ((g_zfs = libzfs_init()) == NULL) {
3231 		(void) fprintf(stderr, gettext("internal error: failed to "
3232 		    "initialize ZFS library\n"));
3233 		return (1);
3234 	}
3235 
3236 	libzfs_print_on_error(g_zfs, B_TRUE);
3237 
3238 	if ((mnttab_file = fopen(MNTTAB, "r")) == NULL) {
3239 		(void) fprintf(stderr, gettext("internal error: unable to "
3240 		    "open %s\n"), MNTTAB);
3241 		return (1);
3242 	}
3243 
3244 	/*
3245 	 * This command also doubles as the /etc/fs mount and unmount program.
3246 	 * Determine if we should take this behavior based on argv[0].
3247 	 */
3248 	progname = basename(argv[0]);
3249 	if (strcmp(progname, "mount") == 0) {
3250 		ret = manual_mount(argc, argv);
3251 	} else if (strcmp(progname, "umount") == 0) {
3252 		ret = manual_unmount(argc, argv);
3253 	} else {
3254 		/*
3255 		 * Make sure the user has specified some command.
3256 		 */
3257 		if (argc < 2) {
3258 			(void) fprintf(stderr, gettext("missing command\n"));
3259 			usage(B_FALSE);
3260 		}
3261 
3262 		cmdname = argv[1];
3263 
3264 		/*
3265 		 * The 'umount' command is an alias for 'unmount'
3266 		 */
3267 		if (strcmp(cmdname, "umount") == 0)
3268 			cmdname = "unmount";
3269 
3270 		/*
3271 		 * The 'recv' command is an alias for 'receive'
3272 		 */
3273 		if (strcmp(cmdname, "recv") == 0)
3274 			cmdname = "receive";
3275 
3276 		/*
3277 		 * Special case '-?'
3278 		 */
3279 		if (strcmp(cmdname, "-?") == 0)
3280 			usage(B_TRUE);
3281 
3282 		/*
3283 		 * 'volinit' and 'volfini' do not appear in the usage message,
3284 		 * so we have to special case them here.
3285 		 */
3286 		if (strcmp(cmdname, "volinit") == 0)
3287 			return (do_volcheck(B_TRUE));
3288 		else if (strcmp(cmdname, "volfini") == 0)
3289 			return (do_volcheck(B_FALSE));
3290 
3291 		/*
3292 		 * Run the appropriate command.
3293 		 */
3294 		for (i = 0; i < NCOMMAND; i++) {
3295 			if (command_table[i].name == NULL)
3296 				continue;
3297 
3298 			if (strcmp(cmdname, command_table[i].name) == 0) {
3299 				current_command = &command_table[i];
3300 				ret = command_table[i].func(argc - 1, argv + 1);
3301 				break;
3302 			}
3303 		}
3304 
3305 		if (i == NCOMMAND) {
3306 			(void) fprintf(stderr, gettext("unrecognized "
3307 			    "command '%s'\n"), cmdname);
3308 			usage(B_FALSE);
3309 		}
3310 	}
3311 
3312 	(void) fclose(mnttab_file);
3313 
3314 	libzfs_fini(g_zfs);
3315 
3316 	/*
3317 	 * The 'ZFS_ABORT' environment variable causes us to dump core on exit
3318 	 * for the purposes of running ::findleaks.
3319 	 */
3320 	if (getenv("ZFS_ABORT") != NULL) {
3321 		(void) printf("dumping core by request\n");
3322 		abort();
3323 	}
3324 
3325 	return (ret);
3326 }
3327