xref: /titanic_52/usr/src/cmd/zfs/zfs_main.c (revision 73427c57f824c3ec3b396181b163f37d50c5b3b1)
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 2007 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  * Callback routinue that will print out information for each of the
243  * the properties.
244  */
245 static zfs_prop_t
246 usage_prop_cb(zfs_prop_t prop, void *cb)
247 {
248 	FILE *fp = cb;
249 
250 	(void) fprintf(fp, "\t%-13s  ", zfs_prop_to_name(prop));
251 
252 	if (zfs_prop_readonly(prop))
253 		(void) fprintf(fp, "  NO    ");
254 	else
255 		(void) fprintf(fp, " YES    ");
256 
257 	if (zfs_prop_inheritable(prop))
258 		(void) fprintf(fp, "  YES   ");
259 	else
260 		(void) fprintf(fp, "   NO   ");
261 
262 	if (zfs_prop_values(prop) == NULL)
263 		(void) fprintf(fp, "-\n");
264 	else
265 		(void) fprintf(fp, "%s\n", zfs_prop_values(prop));
266 
267 	return (ZFS_PROP_CONT);
268 }
269 
270 /*
271  * Display usage message.  If we're inside a command, display only the usage for
272  * that command.  Otherwise, iterate over the entire command table and display
273  * a complete usage message.
274  */
275 static void
276 usage(boolean_t requested)
277 {
278 	int i;
279 	boolean_t show_properties = B_FALSE;
280 	FILE *fp = requested ? stdout : stderr;
281 
282 	if (current_command == NULL) {
283 
284 		(void) fprintf(fp, gettext("usage: zfs command args ...\n"));
285 		(void) fprintf(fp,
286 		    gettext("where 'command' is one of the following:\n\n"));
287 
288 		for (i = 0; i < NCOMMAND; i++) {
289 			if (command_table[i].name == NULL)
290 				(void) fprintf(fp, "\n");
291 			else
292 				(void) fprintf(fp, "%s",
293 				    get_usage(command_table[i].usage));
294 		}
295 
296 		(void) fprintf(fp, gettext("\nEach dataset is of the form: "
297 		    "pool/[dataset/]*dataset[@name]\n"));
298 	} else {
299 		(void) fprintf(fp, gettext("usage:\n"));
300 		(void) fprintf(fp, "%s", get_usage(current_command->usage));
301 	}
302 
303 	if (current_command != NULL &&
304 	    (strcmp(current_command->name, "set") == 0 ||
305 	    strcmp(current_command->name, "get") == 0 ||
306 	    strcmp(current_command->name, "inherit") == 0 ||
307 	    strcmp(current_command->name, "list") == 0))
308 		show_properties = B_TRUE;
309 
310 	if (show_properties) {
311 
312 		(void) fprintf(fp,
313 		    gettext("\nThe following properties are supported:\n"));
314 
315 		(void) fprintf(fp, "\n\t%-13s  %s  %s   %s\n\n",
316 		    "PROPERTY", "EDIT", "INHERIT", "VALUES");
317 
318 		/* Iterate over all properties */
319 		(void) zfs_prop_iter(usage_prop_cb, fp, B_FALSE);
320 
321 		(void) fprintf(fp, gettext("\nSizes are specified in bytes "
322 		    "with standard units such as K, M, G, etc.\n"));
323 		(void) fprintf(fp, gettext("\n\nUser-defined properties can "
324 		    "be specified by using a name containing a colon (:).\n"));
325 	} else {
326 		/*
327 		 * TRANSLATION NOTE:
328 		 * "zfs set|get" must not be localised this is the
329 		 * command name and arguments.
330 		 */
331 		(void) fprintf(fp,
332 		    gettext("\nFor the property list, run: zfs set|get\n"));
333 	}
334 
335 	/*
336 	 * See comments at end of main().
337 	 */
338 	if (getenv("ZFS_ABORT") != NULL) {
339 		(void) printf("dumping core by request\n");
340 		abort();
341 	}
342 
343 	exit(requested ? 0 : 2);
344 }
345 
346 /*
347  * zfs clone <fs, snap, vol> fs
348  *
349  * Given an existing dataset, create a writable copy whose initial contents
350  * are the same as the source.  The newly created dataset maintains a
351  * dependency on the original; the original cannot be destroyed so long as
352  * the clone exists.
353  */
354 static int
355 zfs_do_clone(int argc, char **argv)
356 {
357 	zfs_handle_t *zhp;
358 	int ret;
359 
360 	/* check options */
361 	if (argc > 1 && argv[1][0] == '-') {
362 		(void) fprintf(stderr, gettext("invalid option '%c'\n"),
363 		    argv[1][1]);
364 		usage(B_FALSE);
365 	}
366 
367 	/* check number of arguments */
368 	if (argc < 2) {
369 		(void) fprintf(stderr, gettext("missing source dataset "
370 		    "argument\n"));
371 		usage(B_FALSE);
372 	}
373 	if (argc < 3) {
374 		(void) fprintf(stderr, gettext("missing target dataset "
375 		    "argument\n"));
376 		usage(B_FALSE);
377 	}
378 	if (argc > 3) {
379 		(void) fprintf(stderr, gettext("too many arguments\n"));
380 		usage(B_FALSE);
381 	}
382 
383 	/* open the source dataset */
384 	if ((zhp = zfs_open(g_zfs, argv[1], ZFS_TYPE_SNAPSHOT)) == NULL)
385 		return (1);
386 
387 	/* pass to libzfs */
388 	ret = zfs_clone(zhp, argv[2], NULL);
389 
390 	/* create the mountpoint if necessary */
391 	if (ret == 0) {
392 		zfs_handle_t *clone = zfs_open(g_zfs, argv[2], ZFS_TYPE_ANY);
393 		if (clone != NULL) {
394 			if ((ret = zfs_mount(clone, NULL, 0)) == 0)
395 				ret = zfs_share(clone);
396 			zfs_close(clone);
397 		}
398 		zpool_log_history(g_zfs, argc, argv, argv[2], B_FALSE, B_FALSE);
399 	}
400 
401 	zfs_close(zhp);
402 
403 	return (ret == 0 ? 0 : 1);
404 }
405 
406 /*
407  * zfs create [-o prop=value] ... fs
408  * zfs create [-s] [-b blocksize] [-o prop=value] ... -V vol size
409  *
410  * Create a new dataset.  This command can be used to create filesystems
411  * and volumes.  Snapshot creation is handled by 'zfs snapshot'.
412  * For volumes, the user must specify a size to be used.
413  *
414  * The '-s' flag applies only to volumes, and indicates that we should not try
415  * to set the reservation for this volume.  By default we set a reservation
416  * equal to the size for any volume.
417  */
418 static int
419 zfs_do_create(int argc, char **argv)
420 {
421 	zfs_type_t type = ZFS_TYPE_FILESYSTEM;
422 	zfs_handle_t *zhp = NULL;
423 	uint64_t volsize;
424 	int c;
425 	boolean_t noreserve = B_FALSE;
426 	int ret = 1;
427 	nvlist_t *props = NULL;
428 	uint64_t intval;
429 	char *propname;
430 	char *propval = NULL;
431 	char *strval;
432 
433 	if (nvlist_alloc(&props, NV_UNIQUE_NAME, 0) != 0) {
434 		(void) fprintf(stderr, gettext("internal error: "
435 		    "out of memory\n"));
436 		return (1);
437 	}
438 
439 	/* check options */
440 	while ((c = getopt(argc, argv, ":V:b:so:")) != -1) {
441 		switch (c) {
442 		case 'V':
443 			type = ZFS_TYPE_VOLUME;
444 			if (zfs_nicestrtonum(g_zfs, optarg, &intval) != 0) {
445 				(void) fprintf(stderr, gettext("bad volume "
446 				    "size '%s': %s\n"), optarg,
447 				    libzfs_error_description(g_zfs));
448 				goto error;
449 			}
450 
451 			if (nvlist_add_uint64(props,
452 			    zfs_prop_to_name(ZFS_PROP_VOLSIZE),
453 			    intval) != 0) {
454 				(void) fprintf(stderr, gettext("internal "
455 				    "error: out of memory\n"));
456 				goto error;
457 			}
458 			volsize = intval;
459 			break;
460 		case 'b':
461 			if (zfs_nicestrtonum(g_zfs, optarg, &intval) != 0) {
462 				(void) fprintf(stderr, gettext("bad volume "
463 				    "block size '%s': %s\n"), optarg,
464 				    libzfs_error_description(g_zfs));
465 				goto error;
466 			}
467 
468 			if (nvlist_add_uint64(props,
469 			    zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE),
470 			    intval) != 0) {
471 				(void) fprintf(stderr, gettext("internal "
472 				    "error: out of memory\n"));
473 				goto error;
474 			}
475 			break;
476 		case 'o':
477 			propname = optarg;
478 			if ((propval = strchr(propname, '=')) == NULL) {
479 				(void) fprintf(stderr, gettext("missing "
480 				    "'=' for -o option\n"));
481 				goto error;
482 			}
483 			*propval = '\0';
484 			propval++;
485 			if (nvlist_lookup_string(props, propname,
486 			    &strval) == 0) {
487 				(void) fprintf(stderr, gettext("property '%s' "
488 				    "specified multiple times\n"), propname);
489 				goto error;
490 			}
491 			if (nvlist_add_string(props, propname, propval) != 0) {
492 				(void) fprintf(stderr, gettext("internal "
493 				    "error: out of memory\n"));
494 				goto error;
495 			}
496 			break;
497 		case 's':
498 			noreserve = B_TRUE;
499 			break;
500 		case ':':
501 			(void) fprintf(stderr, gettext("missing size "
502 			    "argument\n"));
503 			goto badusage;
504 			break;
505 		case '?':
506 			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
507 			    optopt);
508 			goto badusage;
509 		}
510 	}
511 
512 	if (noreserve && type != ZFS_TYPE_VOLUME) {
513 		(void) fprintf(stderr, gettext("'-s' can only be used when "
514 		    "creating a volume\n"));
515 		goto badusage;
516 	}
517 
518 	argc -= optind;
519 	argv += optind;
520 
521 	/* check number of arguments */
522 	if (argc == 0) {
523 		(void) fprintf(stderr, gettext("missing %s argument\n"),
524 		    zfs_type_to_name(type));
525 		goto badusage;
526 	}
527 	if (argc > 1) {
528 		(void) fprintf(stderr, gettext("too many arguments\n"));
529 		goto badusage;
530 	}
531 
532 	if (type == ZFS_TYPE_VOLUME && !noreserve &&
533 	    nvlist_lookup_string(props, zfs_prop_to_name(ZFS_PROP_RESERVATION),
534 	    &strval) != 0) {
535 		if (nvlist_add_uint64(props,
536 		    zfs_prop_to_name(ZFS_PROP_RESERVATION),
537 		    volsize) != 0) {
538 			(void) fprintf(stderr, gettext("internal "
539 			    "error: out of memory\n"));
540 			nvlist_free(props);
541 			return (1);
542 		}
543 	}
544 
545 	/* pass to libzfs */
546 	if (zfs_create(g_zfs, argv[0], type, props) != 0)
547 		goto error;
548 
549 	if (propval != NULL)
550 		*(propval - 1) = '=';
551 	zpool_log_history(g_zfs, argc + optind, argv - optind, argv[0],
552 	    B_FALSE, B_FALSE);
553 
554 	if ((zhp = zfs_open(g_zfs, argv[0], ZFS_TYPE_ANY)) == NULL)
555 		goto error;
556 
557 	/*
558 	 * Mount and/or share the new filesystem as appropriate.  We provide a
559 	 * verbose error message to let the user know that their filesystem was
560 	 * in fact created, even if we failed to mount or share it.
561 	 */
562 	if (zfs_mount(zhp, NULL, 0) != 0) {
563 		(void) fprintf(stderr, gettext("filesystem successfully "
564 		    "created, but not mounted\n"));
565 		ret = 1;
566 	} else if (zfs_share(zhp) != 0) {
567 		(void) fprintf(stderr, gettext("filesystem successfully "
568 		    "created, but not shared\n"));
569 		ret = 1;
570 	} else {
571 		ret = 0;
572 	}
573 
574 error:
575 	if (zhp)
576 		zfs_close(zhp);
577 	nvlist_free(props);
578 	return (ret);
579 badusage:
580 	nvlist_free(props);
581 	usage(B_FALSE);
582 	return (2);
583 }
584 
585 /*
586  * zfs destroy [-rf] <fs, snap, vol>
587  *
588  * 	-r	Recursively destroy all children
589  * 	-R	Recursively destroy all dependents, including clones
590  * 	-f	Force unmounting of any dependents
591  *
592  * Destroys the given dataset.  By default, it will unmount any filesystems,
593  * and refuse to destroy a dataset that has any dependents.  A dependent can
594  * either be a child, or a clone of a child.
595  */
596 typedef struct destroy_cbdata {
597 	boolean_t	cb_first;
598 	int		cb_force;
599 	int		cb_recurse;
600 	int		cb_error;
601 	int		cb_needforce;
602 	int		cb_doclones;
603 	boolean_t	cb_closezhp;
604 	zfs_handle_t	*cb_target;
605 	char		*cb_snapname;
606 } destroy_cbdata_t;
607 
608 /*
609  * Check for any dependents based on the '-r' or '-R' flags.
610  */
611 static int
612 destroy_check_dependent(zfs_handle_t *zhp, void *data)
613 {
614 	destroy_cbdata_t *cbp = data;
615 	const char *tname = zfs_get_name(cbp->cb_target);
616 	const char *name = zfs_get_name(zhp);
617 
618 	if (strncmp(tname, name, strlen(tname)) == 0 &&
619 	    (name[strlen(tname)] == '/' || name[strlen(tname)] == '@')) {
620 		/*
621 		 * This is a direct descendant, not a clone somewhere else in
622 		 * the hierarchy.
623 		 */
624 		if (cbp->cb_recurse)
625 			goto out;
626 
627 		if (cbp->cb_first) {
628 			(void) fprintf(stderr, gettext("cannot destroy '%s': "
629 			    "%s has children\n"),
630 			    zfs_get_name(cbp->cb_target),
631 			    zfs_type_to_name(zfs_get_type(cbp->cb_target)));
632 			(void) fprintf(stderr, gettext("use '-r' to destroy "
633 			    "the following datasets:\n"));
634 			cbp->cb_first = B_FALSE;
635 			cbp->cb_error = 1;
636 		}
637 
638 		(void) fprintf(stderr, "%s\n", zfs_get_name(zhp));
639 	} else {
640 		/*
641 		 * This is a clone.  We only want to report this if the '-r'
642 		 * wasn't specified, or the target is a snapshot.
643 		 */
644 		if (!cbp->cb_recurse &&
645 		    zfs_get_type(cbp->cb_target) != ZFS_TYPE_SNAPSHOT)
646 			goto out;
647 
648 		if (cbp->cb_first) {
649 			(void) fprintf(stderr, gettext("cannot destroy '%s': "
650 			    "%s has dependent clones\n"),
651 			    zfs_get_name(cbp->cb_target),
652 			    zfs_type_to_name(zfs_get_type(cbp->cb_target)));
653 			(void) fprintf(stderr, gettext("use '-R' to destroy "
654 			    "the following datasets:\n"));
655 			cbp->cb_first = B_FALSE;
656 			cbp->cb_error = 1;
657 		}
658 
659 		(void) fprintf(stderr, "%s\n", zfs_get_name(zhp));
660 	}
661 
662 out:
663 	zfs_close(zhp);
664 	return (0);
665 }
666 
667 static int
668 destroy_callback(zfs_handle_t *zhp, void *data)
669 {
670 	destroy_cbdata_t *cbp = data;
671 
672 	/*
673 	 * Ignore pools (which we've already flagged as an error before getting
674 	 * here.
675 	 */
676 	if (strchr(zfs_get_name(zhp), '/') == NULL &&
677 	    zfs_get_type(zhp) == ZFS_TYPE_FILESYSTEM) {
678 		zfs_close(zhp);
679 		return (0);
680 	}
681 
682 	/*
683 	 * Bail out on the first error.
684 	 */
685 	if (zfs_unmount(zhp, NULL, cbp->cb_force ? MS_FORCE : 0) != 0 ||
686 	    zfs_destroy(zhp) != 0) {
687 		zfs_close(zhp);
688 		return (-1);
689 	}
690 
691 	zfs_close(zhp);
692 	return (0);
693 }
694 
695 static int
696 destroy_snap_clones(zfs_handle_t *zhp, void *arg)
697 {
698 	destroy_cbdata_t *cbp = arg;
699 	char thissnap[MAXPATHLEN];
700 	zfs_handle_t *szhp;
701 	boolean_t closezhp = cbp->cb_closezhp;
702 	int rv;
703 
704 	(void) snprintf(thissnap, sizeof (thissnap),
705 	    "%s@%s", zfs_get_name(zhp), cbp->cb_snapname);
706 
707 	libzfs_print_on_error(g_zfs, B_FALSE);
708 	szhp = zfs_open(g_zfs, thissnap, ZFS_TYPE_SNAPSHOT);
709 	libzfs_print_on_error(g_zfs, B_TRUE);
710 	if (szhp) {
711 		/*
712 		 * Destroy any clones of this snapshot
713 		 */
714 		if (zfs_iter_dependents(szhp, B_FALSE, destroy_callback,
715 		    cbp) != 0) {
716 			zfs_close(szhp);
717 			if (closezhp)
718 				zfs_close(zhp);
719 			return (-1);
720 		}
721 		zfs_close(szhp);
722 	}
723 
724 	cbp->cb_closezhp = B_TRUE;
725 	rv = zfs_iter_filesystems(zhp, destroy_snap_clones, arg);
726 	if (closezhp)
727 		zfs_close(zhp);
728 	return (rv);
729 }
730 
731 static int
732 zfs_do_destroy(int argc, char **argv)
733 {
734 	destroy_cbdata_t cb = { 0 };
735 	int c;
736 	zfs_handle_t *zhp;
737 	char *cp;
738 
739 	/* check options */
740 	while ((c = getopt(argc, argv, "frR")) != -1) {
741 		switch (c) {
742 		case 'f':
743 			cb.cb_force = 1;
744 			break;
745 		case 'r':
746 			cb.cb_recurse = 1;
747 			break;
748 		case 'R':
749 			cb.cb_recurse = 1;
750 			cb.cb_doclones = 1;
751 			break;
752 		case '?':
753 		default:
754 			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
755 			    optopt);
756 			usage(B_FALSE);
757 		}
758 	}
759 
760 	argc -= optind;
761 	argv += optind;
762 
763 	/* check number of arguments */
764 	if (argc == 0) {
765 		(void) fprintf(stderr, gettext("missing path argument\n"));
766 		usage(B_FALSE);
767 	}
768 	if (argc > 1) {
769 		(void) fprintf(stderr, gettext("too many arguments\n"));
770 		usage(B_FALSE);
771 	}
772 
773 	/*
774 	 * If we are doing recursive destroy of a snapshot, then the
775 	 * named snapshot may not exist.  Go straight to libzfs.
776 	 */
777 	if (cb.cb_recurse && (cp = strchr(argv[0], '@'))) {
778 		int ret;
779 
780 		*cp = '\0';
781 		if ((zhp = zfs_open(g_zfs, argv[0], ZFS_TYPE_ANY)) == NULL)
782 			return (1);
783 		*cp = '@';
784 		cp++;
785 
786 		if (cb.cb_doclones) {
787 			cb.cb_snapname = cp;
788 			if (destroy_snap_clones(zhp, &cb) != 0) {
789 				zfs_close(zhp);
790 				return (1);
791 			}
792 		}
793 
794 		ret = zfs_destroy_snaps(zhp, cp);
795 		zfs_close(zhp);
796 		if (ret) {
797 			(void) fprintf(stderr,
798 			    gettext("no snapshots destroyed\n"));
799 		} else {
800 			zpool_log_history(g_zfs, argc + optind, argv - optind,
801 			    argv[0], B_FALSE, B_FALSE);
802 		}
803 		return (ret != 0);
804 	}
805 
806 
807 	/* Open the given dataset */
808 	if ((zhp = zfs_open(g_zfs, argv[0], ZFS_TYPE_ANY)) == NULL)
809 		return (1);
810 
811 	cb.cb_target = zhp;
812 
813 	/*
814 	 * Perform an explicit check for pools before going any further.
815 	 */
816 	if (!cb.cb_recurse && strchr(zfs_get_name(zhp), '/') == NULL &&
817 	    zfs_get_type(zhp) == ZFS_TYPE_FILESYSTEM) {
818 		(void) fprintf(stderr, gettext("cannot destroy '%s': "
819 		    "operation does not apply to pools\n"),
820 		    zfs_get_name(zhp));
821 		(void) fprintf(stderr, gettext("use 'zfs destroy -r "
822 		    "%s' to destroy all datasets in the pool\n"),
823 		    zfs_get_name(zhp));
824 		(void) fprintf(stderr, gettext("use 'zpool destroy %s' "
825 		    "to destroy the pool itself\n"), zfs_get_name(zhp));
826 		zfs_close(zhp);
827 		return (1);
828 	}
829 
830 	/*
831 	 * Check for any dependents and/or clones.
832 	 */
833 	cb.cb_first = B_TRUE;
834 	if (!cb.cb_doclones &&
835 	    zfs_iter_dependents(zhp, B_TRUE, destroy_check_dependent,
836 	    &cb) != 0) {
837 		zfs_close(zhp);
838 		return (1);
839 	}
840 
841 
842 	if (cb.cb_error ||
843 	    zfs_iter_dependents(zhp, B_FALSE, destroy_callback, &cb) != 0) {
844 		zfs_close(zhp);
845 		return (1);
846 	}
847 
848 	/*
849 	 * Do the real thing.  The callback will close the handle regardless of
850 	 * whether it succeeds or not.
851 	 */
852 	if (destroy_callback(zhp, &cb) != 0)
853 		return (1);
854 
855 	zpool_log_history(g_zfs, argc + optind, argv - optind, argv[0],
856 	    B_FALSE, B_FALSE);
857 
858 	return (0);
859 }
860 
861 /*
862  * zfs get [-rHp] [-o field[,field]...] [-s source[,source]...]
863  * 	< all | property[,property]... > < fs | snap | vol > ...
864  *
865  *	-r	recurse over any child datasets
866  *	-H	scripted mode.  Headers are stripped, and fields are separated
867  *		by tabs instead of spaces.
868  *	-o	Set of fields to display.  One of "name,property,value,source".
869  *		Default is all four.
870  *	-s	Set of sources to allow.  One of
871  *		"local,default,inherited,temporary,none".  Default is all
872  *		five.
873  *	-p	Display values in parsable (literal) format.
874  *
875  *  Prints properties for the given datasets.  The user can control which
876  *  columns to display as well as which property types to allow.
877  */
878 
879 /*
880  * Invoked to display the properties for a single dataset.
881  */
882 static int
883 get_callback(zfs_handle_t *zhp, void *data)
884 {
885 	char buf[ZFS_MAXPROPLEN];
886 	zfs_source_t sourcetype;
887 	char source[ZFS_MAXNAMELEN];
888 	libzfs_get_cbdata_t *cbp = data;
889 	nvlist_t *userprop = zfs_get_user_props(zhp);
890 	zfs_proplist_t *pl = cbp->cb_proplist;
891 	nvlist_t *propval;
892 	char *strval;
893 	char *sourceval;
894 
895 	for (; pl != NULL; pl = pl->pl_next) {
896 		/*
897 		 * Skip the special fake placeholder.  This will also skip over
898 		 * the name property when 'all' is specified.
899 		 */
900 		if (pl->pl_prop == ZFS_PROP_NAME &&
901 		    pl == cbp->cb_proplist)
902 			continue;
903 
904 		if (pl->pl_prop != ZFS_PROP_INVAL) {
905 			if (zfs_prop_get(zhp, pl->pl_prop, buf,
906 			    sizeof (buf), &sourcetype, source,
907 			    sizeof (source),
908 			    cbp->cb_literal) != 0) {
909 				if (pl->pl_all)
910 					continue;
911 				if (!zfs_prop_valid_for_type(pl->pl_prop,
912 				    ZFS_TYPE_ANY)) {
913 					(void) fprintf(stderr,
914 					    gettext("No such property '%s'\n"),
915 					    zfs_prop_to_name(pl->pl_prop));
916 					continue;
917 				}
918 				sourcetype = ZFS_SRC_NONE;
919 				(void) strlcpy(buf, "-", sizeof (buf));
920 			}
921 
922 			libzfs_print_one_property(zfs_get_name(zhp), cbp,
923 			    zfs_prop_to_name(pl->pl_prop),
924 			    buf, sourcetype, source);
925 		} else {
926 			if (nvlist_lookup_nvlist(userprop,
927 			    pl->pl_user_prop, &propval) != 0) {
928 				if (pl->pl_all)
929 					continue;
930 				sourcetype = ZFS_SRC_NONE;
931 				strval = "-";
932 			} else {
933 				verify(nvlist_lookup_string(propval,
934 				    ZFS_PROP_VALUE, &strval) == 0);
935 				verify(nvlist_lookup_string(propval,
936 				    ZFS_PROP_SOURCE, &sourceval) == 0);
937 
938 				if (strcmp(sourceval,
939 				    zfs_get_name(zhp)) == 0) {
940 					sourcetype = ZFS_SRC_LOCAL;
941 				} else {
942 					sourcetype = ZFS_SRC_INHERITED;
943 					(void) strlcpy(source,
944 					    sourceval, sizeof (source));
945 				}
946 			}
947 
948 			libzfs_print_one_property(zfs_get_name(zhp), cbp,
949 			    pl->pl_user_prop, strval, sourcetype,
950 			    source);
951 		}
952 	}
953 
954 	return (0);
955 }
956 
957 static int
958 zfs_do_get(int argc, char **argv)
959 {
960 	libzfs_get_cbdata_t cb = { 0 };
961 	boolean_t recurse = B_FALSE;
962 	int i, c;
963 	char *value, *fields;
964 	int ret;
965 	zfs_proplist_t fake_name = { 0 };
966 
967 	/*
968 	 * Set up default columns and sources.
969 	 */
970 	cb.cb_sources = ZFS_SRC_ALL;
971 	cb.cb_columns[0] = GET_COL_NAME;
972 	cb.cb_columns[1] = GET_COL_PROPERTY;
973 	cb.cb_columns[2] = GET_COL_VALUE;
974 	cb.cb_columns[3] = GET_COL_SOURCE;
975 
976 	/* check options */
977 	while ((c = getopt(argc, argv, ":o:s:rHp")) != -1) {
978 		switch (c) {
979 		case 'p':
980 			cb.cb_literal = B_TRUE;
981 			break;
982 		case 'r':
983 			recurse = B_TRUE;
984 			break;
985 		case 'H':
986 			cb.cb_scripted = B_TRUE;
987 			break;
988 		case ':':
989 			(void) fprintf(stderr, gettext("missing argument for "
990 			    "'%c' option\n"), optopt);
991 			usage(B_FALSE);
992 			break;
993 		case 'o':
994 			/*
995 			 * Process the set of columns to display.  We zero out
996 			 * the structure to give us a blank slate.
997 			 */
998 			bzero(&cb.cb_columns, sizeof (cb.cb_columns));
999 			i = 0;
1000 			while (*optarg != '\0') {
1001 				static char *col_subopts[] =
1002 				    { "name", "property", "value", "source",
1003 				    NULL };
1004 
1005 				if (i == 4) {
1006 					(void) fprintf(stderr, gettext("too "
1007 					    "many fields given to -o "
1008 					    "option\n"));
1009 					usage(B_FALSE);
1010 				}
1011 
1012 				switch (getsubopt(&optarg, col_subopts,
1013 				    &value)) {
1014 				case 0:
1015 					cb.cb_columns[i++] = GET_COL_NAME;
1016 					break;
1017 				case 1:
1018 					cb.cb_columns[i++] = GET_COL_PROPERTY;
1019 					break;
1020 				case 2:
1021 					cb.cb_columns[i++] = GET_COL_VALUE;
1022 					break;
1023 				case 3:
1024 					cb.cb_columns[i++] = GET_COL_SOURCE;
1025 					break;
1026 				default:
1027 					(void) fprintf(stderr,
1028 					    gettext("invalid column name "
1029 					    "'%s'\n"), value);
1030 					usage(B_FALSE);
1031 				}
1032 			}
1033 			break;
1034 
1035 		case 's':
1036 			cb.cb_sources = 0;
1037 			while (*optarg != '\0') {
1038 				static char *source_subopts[] = {
1039 					"local", "default", "inherited",
1040 					"temporary", "none", NULL };
1041 
1042 				switch (getsubopt(&optarg, source_subopts,
1043 				    &value)) {
1044 				case 0:
1045 					cb.cb_sources |= ZFS_SRC_LOCAL;
1046 					break;
1047 				case 1:
1048 					cb.cb_sources |= ZFS_SRC_DEFAULT;
1049 					break;
1050 				case 2:
1051 					cb.cb_sources |= ZFS_SRC_INHERITED;
1052 					break;
1053 				case 3:
1054 					cb.cb_sources |= ZFS_SRC_TEMPORARY;
1055 					break;
1056 				case 4:
1057 					cb.cb_sources |= ZFS_SRC_NONE;
1058 					break;
1059 				default:
1060 					(void) fprintf(stderr,
1061 					    gettext("invalid source "
1062 					    "'%s'\n"), value);
1063 					usage(B_FALSE);
1064 				}
1065 			}
1066 			break;
1067 
1068 		case '?':
1069 			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
1070 			    optopt);
1071 			usage(B_FALSE);
1072 		}
1073 	}
1074 
1075 	argc -= optind;
1076 	argv += optind;
1077 
1078 	if (argc < 1) {
1079 		(void) fprintf(stderr, gettext("missing property "
1080 		    "argument\n"));
1081 		usage(B_FALSE);
1082 	}
1083 
1084 	fields = argv[0];
1085 
1086 	if (zfs_get_proplist(g_zfs, fields, &cb.cb_proplist) != 0)
1087 		usage(B_FALSE);
1088 
1089 	argc--;
1090 	argv++;
1091 
1092 	/*
1093 	 * As part of zfs_expand_proplist(), we keep track of the maximum column
1094 	 * width for each property.  For the 'NAME' (and 'SOURCE') columns, we
1095 	 * need to know the maximum name length.  However, the user likely did
1096 	 * not specify 'name' as one of the properties to fetch, so we need to
1097 	 * make sure we always include at least this property for
1098 	 * print_get_headers() to work properly.
1099 	 */
1100 	if (cb.cb_proplist != NULL) {
1101 		fake_name.pl_prop = ZFS_PROP_NAME;
1102 		fake_name.pl_width = strlen(gettext("NAME"));
1103 		fake_name.pl_next = cb.cb_proplist;
1104 		cb.cb_proplist = &fake_name;
1105 	}
1106 
1107 	cb.cb_first = B_TRUE;
1108 
1109 	/* run for each object */
1110 	ret = zfs_for_each(argc, argv, recurse, ZFS_TYPE_ANY, NULL,
1111 	    &cb.cb_proplist, get_callback, &cb, B_FALSE);
1112 
1113 	if (cb.cb_proplist == &fake_name)
1114 		zfs_free_proplist(fake_name.pl_next);
1115 	else
1116 		zfs_free_proplist(cb.cb_proplist);
1117 
1118 	return (ret);
1119 }
1120 
1121 /*
1122  * inherit [-r] <property> <fs|vol> ...
1123  *
1124  * 	-r	Recurse over all children
1125  *
1126  * For each dataset specified on the command line, inherit the given property
1127  * from its parent.  Inheriting a property at the pool level will cause it to
1128  * use the default value.  The '-r' flag will recurse over all children, and is
1129  * useful for setting a property on a hierarchy-wide basis, regardless of any
1130  * local modifications for each dataset.
1131  */
1132 typedef struct inherit_cbdata {
1133 	char		*cb_propname;
1134 	boolean_t	cb_any_successful;
1135 } inherit_cbdata_t;
1136 
1137 static int
1138 inherit_callback(zfs_handle_t *zhp, void *data)
1139 {
1140 	inherit_cbdata_t *cbp = data;
1141 	int ret;
1142 
1143 	ret = zfs_prop_inherit(zhp, cbp->cb_propname);
1144 	if (ret == 0)
1145 		cbp->cb_any_successful = B_TRUE;
1146 	return (ret != 0);
1147 }
1148 
1149 static int
1150 zfs_do_inherit(int argc, char **argv)
1151 {
1152 	boolean_t recurse = B_FALSE;
1153 	int c;
1154 	zfs_prop_t prop;
1155 	inherit_cbdata_t cb;
1156 	int ret;
1157 
1158 	/* check options */
1159 	while ((c = getopt(argc, argv, "r")) != -1) {
1160 		switch (c) {
1161 		case 'r':
1162 			recurse = B_TRUE;
1163 			break;
1164 		case '?':
1165 		default:
1166 			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
1167 			    optopt);
1168 			usage(B_FALSE);
1169 		}
1170 	}
1171 
1172 	argc -= optind;
1173 	argv += optind;
1174 
1175 	/* check number of arguments */
1176 	if (argc < 1) {
1177 		(void) fprintf(stderr, gettext("missing property argument\n"));
1178 		usage(B_FALSE);
1179 	}
1180 	if (argc < 2) {
1181 		(void) fprintf(stderr, gettext("missing dataset argument\n"));
1182 		usage(B_FALSE);
1183 	}
1184 
1185 	cb.cb_propname = argv[0];
1186 	argc--;
1187 	argv++;
1188 
1189 	if ((prop = zfs_name_to_prop(cb.cb_propname)) != ZFS_PROP_INVAL) {
1190 		if (zfs_prop_readonly(prop)) {
1191 			(void) fprintf(stderr, gettext(
1192 			    "%s property is read-only\n"),
1193 			    cb.cb_propname);
1194 			return (1);
1195 		}
1196 		if (!zfs_prop_inheritable(prop)) {
1197 			(void) fprintf(stderr, gettext("'%s' property cannot "
1198 			    "be inherited\n"), cb.cb_propname);
1199 			if (prop == ZFS_PROP_QUOTA ||
1200 			    prop == ZFS_PROP_RESERVATION)
1201 				(void) fprintf(stderr, gettext("use 'zfs set "
1202 				    "%s=none' to clear\n"), cb.cb_propname);
1203 			return (1);
1204 		}
1205 	} else if (!zfs_prop_user(cb.cb_propname)) {
1206 		(void) fprintf(stderr, gettext(
1207 		    "invalid property '%s'\n"),
1208 		    cb.cb_propname);
1209 		usage(B_FALSE);
1210 	}
1211 
1212 	cb.cb_any_successful = B_FALSE;
1213 
1214 	ret = zfs_for_each(argc, argv, recurse,
1215 	    ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME, NULL, NULL,
1216 	    inherit_callback, &cb, B_FALSE);
1217 
1218 	if (cb.cb_any_successful) {
1219 		zpool_log_history(g_zfs, argc + optind + 1, argv - optind - 1,
1220 		    argv[0], B_FALSE, B_FALSE);
1221 	}
1222 
1223 	return (ret);
1224 }
1225 
1226 /*
1227  * list [-rH] [-o property[,property]...] [-t type[,type]...]
1228  *      [-s property [-s property]...] [-S property [-S property]...]
1229  *      <dataset> ...
1230  *
1231  * 	-r	Recurse over all children
1232  * 	-H	Scripted mode; elide headers and separate colums by tabs
1233  * 	-o	Control which fields to display.
1234  * 	-t	Control which object types to display.
1235  *	-s	Specify sort columns, descending order.
1236  *	-S	Specify sort columns, ascending order.
1237  *
1238  * When given no arguments, lists all filesystems in the system.
1239  * Otherwise, list the specified datasets, optionally recursing down them if
1240  * '-r' is specified.
1241  */
1242 typedef struct list_cbdata {
1243 	boolean_t	cb_first;
1244 	boolean_t	cb_scripted;
1245 	zfs_proplist_t	*cb_proplist;
1246 } list_cbdata_t;
1247 
1248 /*
1249  * Given a list of columns to display, output appropriate headers for each one.
1250  */
1251 static void
1252 print_header(zfs_proplist_t *pl)
1253 {
1254 	char headerbuf[ZFS_MAXPROPLEN];
1255 	const char *header;
1256 	int i;
1257 	boolean_t first = B_TRUE;
1258 	boolean_t right_justify;
1259 
1260 	for (; pl != NULL; pl = pl->pl_next) {
1261 		if (!first) {
1262 			(void) printf("  ");
1263 		} else {
1264 			first = B_FALSE;
1265 		}
1266 
1267 		right_justify = B_FALSE;
1268 		if (pl->pl_prop != ZFS_PROP_INVAL) {
1269 			header = zfs_prop_column_name(pl->pl_prop);
1270 			right_justify = zfs_prop_align_right(pl->pl_prop);
1271 		} else {
1272 			for (i = 0; pl->pl_user_prop[i] != '\0'; i++)
1273 				headerbuf[i] = toupper(pl->pl_user_prop[i]);
1274 			headerbuf[i] = '\0';
1275 			header = headerbuf;
1276 		}
1277 
1278 		if (pl->pl_next == NULL && !right_justify)
1279 			(void) printf("%s", header);
1280 		else if (right_justify)
1281 			(void) printf("%*s", pl->pl_width, header);
1282 		else
1283 			(void) printf("%-*s", pl->pl_width, header);
1284 	}
1285 
1286 	(void) printf("\n");
1287 }
1288 
1289 /*
1290  * Given a dataset and a list of fields, print out all the properties according
1291  * to the described layout.
1292  */
1293 static void
1294 print_dataset(zfs_handle_t *zhp, zfs_proplist_t *pl, int scripted)
1295 {
1296 	boolean_t first = B_TRUE;
1297 	char property[ZFS_MAXPROPLEN];
1298 	nvlist_t *userprops = zfs_get_user_props(zhp);
1299 	nvlist_t *propval;
1300 	char *propstr;
1301 	boolean_t right_justify;
1302 	int width;
1303 
1304 	for (; pl != NULL; pl = pl->pl_next) {
1305 		if (!first) {
1306 			if (scripted)
1307 				(void) printf("\t");
1308 			else
1309 				(void) printf("  ");
1310 		} else {
1311 			first = B_FALSE;
1312 		}
1313 
1314 		right_justify = B_FALSE;
1315 		if (pl->pl_prop != ZFS_PROP_INVAL) {
1316 			if (zfs_prop_get(zhp, pl->pl_prop, property,
1317 			    sizeof (property), NULL, NULL, 0, B_FALSE) != 0)
1318 				propstr = "-";
1319 			else
1320 				propstr = property;
1321 
1322 			right_justify = zfs_prop_align_right(pl->pl_prop);
1323 		} else {
1324 			if (nvlist_lookup_nvlist(userprops,
1325 			    pl->pl_user_prop, &propval) != 0)
1326 				propstr = "-";
1327 			else
1328 				verify(nvlist_lookup_string(propval,
1329 				    ZFS_PROP_VALUE, &propstr) == 0);
1330 		}
1331 
1332 		width = pl->pl_width;
1333 
1334 		/*
1335 		 * If this is being called in scripted mode, or if this is the
1336 		 * last column and it is left-justified, don't include a width
1337 		 * format specifier.
1338 		 */
1339 		if (scripted || (pl->pl_next == NULL && !right_justify))
1340 			(void) printf("%s", propstr);
1341 		else if (right_justify)
1342 			(void) printf("%*s", width, propstr);
1343 		else
1344 			(void) printf("%-*s", width, propstr);
1345 	}
1346 
1347 	(void) printf("\n");
1348 }
1349 
1350 /*
1351  * Generic callback function to list a dataset or snapshot.
1352  */
1353 static int
1354 list_callback(zfs_handle_t *zhp, void *data)
1355 {
1356 	list_cbdata_t *cbp = data;
1357 
1358 	if (cbp->cb_first) {
1359 		if (!cbp->cb_scripted)
1360 			print_header(cbp->cb_proplist);
1361 		cbp->cb_first = B_FALSE;
1362 	}
1363 
1364 	print_dataset(zhp, cbp->cb_proplist, cbp->cb_scripted);
1365 
1366 	return (0);
1367 }
1368 
1369 static int
1370 zfs_do_list(int argc, char **argv)
1371 {
1372 	int c;
1373 	boolean_t recurse = B_FALSE;
1374 	boolean_t scripted = B_FALSE;
1375 	static char default_fields[] =
1376 	    "name,used,available,referenced,mountpoint";
1377 	int types = ZFS_TYPE_ANY;
1378 	char *fields = NULL;
1379 	char *basic_fields = default_fields;
1380 	list_cbdata_t cb = { 0 };
1381 	char *value;
1382 	int ret;
1383 	char *type_subopts[] = { "filesystem", "volume", "snapshot", NULL };
1384 	zfs_sort_column_t *sortcol = NULL;
1385 
1386 	/* check options */
1387 	while ((c = getopt(argc, argv, ":o:rt:Hs:S:")) != -1) {
1388 		switch (c) {
1389 		case 'o':
1390 			fields = optarg;
1391 			break;
1392 		case 'r':
1393 			recurse = B_TRUE;
1394 			break;
1395 		case 'H':
1396 			scripted = B_TRUE;
1397 			break;
1398 		case 's':
1399 			if (zfs_add_sort_column(&sortcol, optarg,
1400 			    B_FALSE) != 0) {
1401 				(void) fprintf(stderr,
1402 				    gettext("invalid property '%s'\n"), optarg);
1403 				usage(B_FALSE);
1404 			}
1405 			break;
1406 		case 'S':
1407 			if (zfs_add_sort_column(&sortcol, optarg,
1408 			    B_TRUE) != 0) {
1409 				(void) fprintf(stderr,
1410 				    gettext("invalid property '%s'\n"), optarg);
1411 				usage(B_FALSE);
1412 			}
1413 			break;
1414 		case 't':
1415 			types = 0;
1416 			while (*optarg != '\0') {
1417 				switch (getsubopt(&optarg, type_subopts,
1418 				    &value)) {
1419 				case 0:
1420 					types |= ZFS_TYPE_FILESYSTEM;
1421 					break;
1422 				case 1:
1423 					types |= ZFS_TYPE_VOLUME;
1424 					break;
1425 				case 2:
1426 					types |= ZFS_TYPE_SNAPSHOT;
1427 					break;
1428 				default:
1429 					(void) fprintf(stderr,
1430 					    gettext("invalid type '%s'\n"),
1431 					    value);
1432 					usage(B_FALSE);
1433 				}
1434 			}
1435 			break;
1436 		case ':':
1437 			(void) fprintf(stderr, gettext("missing argument for "
1438 			    "'%c' option\n"), optopt);
1439 			usage(B_FALSE);
1440 			break;
1441 		case '?':
1442 			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
1443 			    optopt);
1444 			usage(B_FALSE);
1445 		}
1446 	}
1447 
1448 	argc -= optind;
1449 	argv += optind;
1450 
1451 	if (fields == NULL)
1452 		fields = basic_fields;
1453 
1454 	/*
1455 	 * If the user specifies '-o all', the zfs_get_proplist() doesn't
1456 	 * normally include the name of the dataset.  For 'zfs list', we always
1457 	 * want this property to be first.
1458 	 */
1459 	if (zfs_get_proplist(g_zfs, fields, &cb.cb_proplist) != 0)
1460 		usage(B_FALSE);
1461 
1462 	cb.cb_scripted = scripted;
1463 	cb.cb_first = B_TRUE;
1464 
1465 	ret = zfs_for_each(argc, argv, recurse, types, sortcol, &cb.cb_proplist,
1466 	    list_callback, &cb, B_TRUE);
1467 
1468 	zfs_free_proplist(cb.cb_proplist);
1469 	zfs_free_sort_columns(sortcol);
1470 
1471 	if (ret == 0 && cb.cb_first)
1472 		(void) printf(gettext("no datasets available\n"));
1473 
1474 	return (ret);
1475 }
1476 
1477 /*
1478  * zfs rename <fs | snap | vol> <fs | snap | vol>
1479  *
1480  * Renames the given dataset to another of the same type.
1481  */
1482 /* ARGSUSED */
1483 static int
1484 zfs_do_rename(int argc, char **argv)
1485 {
1486 	zfs_handle_t *zhp;
1487 	int ret;
1488 
1489 	/* check options */
1490 	if (argc > 1 && argv[1][0] == '-') {
1491 		(void) fprintf(stderr, gettext("invalid option '%c'\n"),
1492 		    argv[1][1]);
1493 		usage(B_FALSE);
1494 	}
1495 
1496 	/* check number of arguments */
1497 	if (argc < 2) {
1498 		(void) fprintf(stderr, gettext("missing source dataset "
1499 		    "argument\n"));
1500 		usage(B_FALSE);
1501 	}
1502 	if (argc < 3) {
1503 		(void) fprintf(stderr, gettext("missing target dataset "
1504 		    "argument\n"));
1505 		usage(B_FALSE);
1506 	}
1507 	if (argc > 3) {
1508 		(void) fprintf(stderr, gettext("too many arguments\n"));
1509 		usage(B_FALSE);
1510 	}
1511 
1512 	if ((zhp = zfs_open(g_zfs, argv[1], ZFS_TYPE_ANY)) == NULL)
1513 		return (1);
1514 
1515 	ret = (zfs_rename(zhp, argv[2]) != 0);
1516 
1517 	if (!ret)
1518 		zpool_log_history(g_zfs, argc, argv, argv[2], B_FALSE, B_FALSE);
1519 
1520 	zfs_close(zhp);
1521 	return (ret);
1522 }
1523 
1524 /*
1525  * zfs promote <fs>
1526  *
1527  * Promotes the given clone fs to be the parent
1528  */
1529 /* ARGSUSED */
1530 static int
1531 zfs_do_promote(int argc, char **argv)
1532 {
1533 	zfs_handle_t *zhp;
1534 	int ret;
1535 
1536 	/* check options */
1537 	if (argc > 1 && argv[1][0] == '-') {
1538 		(void) fprintf(stderr, gettext("invalid option '%c'\n"),
1539 		    argv[1][1]);
1540 		usage(B_FALSE);
1541 	}
1542 
1543 	/* check number of arguments */
1544 	if (argc < 2) {
1545 		(void) fprintf(stderr, gettext("missing clone filesystem"
1546 		    " argument\n"));
1547 		usage(B_FALSE);
1548 	}
1549 	if (argc > 2) {
1550 		(void) fprintf(stderr, gettext("too many arguments\n"));
1551 		usage(B_FALSE);
1552 	}
1553 
1554 	zhp = zfs_open(g_zfs, argv[1], ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME);
1555 	if (zhp == NULL)
1556 		return (1);
1557 
1558 	ret = (zfs_promote(zhp) != 0);
1559 
1560 	if (!ret)
1561 		zpool_log_history(g_zfs, argc, argv, argv[1], B_FALSE, B_FALSE);
1562 
1563 	zfs_close(zhp);
1564 	return (ret);
1565 }
1566 
1567 /*
1568  * zfs rollback [-rfR] <snapshot>
1569  *
1570  * 	-r	Delete any intervening snapshots before doing rollback
1571  * 	-R	Delete any snapshots and their clones
1572  * 	-f	Force unmount filesystems, even if they are in use.
1573  *
1574  * Given a filesystem, rollback to a specific snapshot, discarding any changes
1575  * since then and making it the active dataset.  If more recent snapshots exist,
1576  * the command will complain unless the '-r' flag is given.
1577  */
1578 typedef struct rollback_cbdata {
1579 	uint64_t	cb_create;
1580 	boolean_t	cb_first;
1581 	int		cb_doclones;
1582 	char		*cb_target;
1583 	int		cb_error;
1584 	boolean_t	cb_recurse;
1585 	boolean_t	cb_dependent;
1586 } rollback_cbdata_t;
1587 
1588 /*
1589  * Report any snapshots more recent than the one specified.  Used when '-r' is
1590  * not specified.  We reuse this same callback for the snapshot dependents - if
1591  * 'cb_dependent' is set, then this is a dependent and we should report it
1592  * without checking the transaction group.
1593  */
1594 static int
1595 rollback_check(zfs_handle_t *zhp, void *data)
1596 {
1597 	rollback_cbdata_t *cbp = data;
1598 
1599 	if (cbp->cb_doclones) {
1600 		zfs_close(zhp);
1601 		return (0);
1602 	}
1603 
1604 	if (!cbp->cb_dependent) {
1605 		if (strcmp(zfs_get_name(zhp), cbp->cb_target) != 0 &&
1606 		    zfs_get_type(zhp) == ZFS_TYPE_SNAPSHOT &&
1607 		    zfs_prop_get_int(zhp, ZFS_PROP_CREATETXG) >
1608 		    cbp->cb_create) {
1609 
1610 			if (cbp->cb_first && !cbp->cb_recurse) {
1611 				(void) fprintf(stderr, gettext("cannot "
1612 				    "rollback to '%s': more recent snapshots "
1613 				    "exist\n"),
1614 				    cbp->cb_target);
1615 				(void) fprintf(stderr, gettext("use '-r' to "
1616 				    "force deletion of the following "
1617 				    "snapshots:\n"));
1618 				cbp->cb_first = 0;
1619 				cbp->cb_error = 1;
1620 			}
1621 
1622 			if (cbp->cb_recurse) {
1623 				cbp->cb_dependent = B_TRUE;
1624 				if (zfs_iter_dependents(zhp, B_TRUE,
1625 				    rollback_check, cbp) != 0) {
1626 					zfs_close(zhp);
1627 					return (-1);
1628 				}
1629 				cbp->cb_dependent = B_FALSE;
1630 			} else {
1631 				(void) fprintf(stderr, "%s\n",
1632 				    zfs_get_name(zhp));
1633 			}
1634 		}
1635 	} else {
1636 		if (cbp->cb_first && cbp->cb_recurse) {
1637 			(void) fprintf(stderr, gettext("cannot rollback to "
1638 			    "'%s': clones of previous snapshots exist\n"),
1639 			    cbp->cb_target);
1640 			(void) fprintf(stderr, gettext("use '-R' to "
1641 			    "force deletion of the following clones and "
1642 			    "dependents:\n"));
1643 			cbp->cb_first = 0;
1644 			cbp->cb_error = 1;
1645 		}
1646 
1647 		(void) fprintf(stderr, "%s\n", zfs_get_name(zhp));
1648 	}
1649 
1650 	zfs_close(zhp);
1651 	return (0);
1652 }
1653 
1654 static int
1655 zfs_do_rollback(int argc, char **argv)
1656 {
1657 	int ret;
1658 	int c;
1659 	rollback_cbdata_t cb = { 0 };
1660 	zfs_handle_t *zhp, *snap;
1661 	char parentname[ZFS_MAXNAMELEN];
1662 	char *delim;
1663 	int force = 0;
1664 
1665 	/* check options */
1666 	while ((c = getopt(argc, argv, "rfR")) != -1) {
1667 		switch (c) {
1668 		case 'f':
1669 			force = 1;
1670 			break;
1671 		case 'r':
1672 			cb.cb_recurse = 1;
1673 			break;
1674 		case 'R':
1675 			cb.cb_recurse = 1;
1676 			cb.cb_doclones = 1;
1677 			break;
1678 		case '?':
1679 			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
1680 			    optopt);
1681 			usage(B_FALSE);
1682 		}
1683 	}
1684 
1685 	argc -= optind;
1686 	argv += optind;
1687 
1688 	/* check number of arguments */
1689 	if (argc < 1) {
1690 		(void) fprintf(stderr, gettext("missing dataset argument\n"));
1691 		usage(B_FALSE);
1692 	}
1693 	if (argc > 1) {
1694 		(void) fprintf(stderr, gettext("too many arguments\n"));
1695 		usage(B_FALSE);
1696 	}
1697 
1698 	/* open the snapshot */
1699 	if ((snap = zfs_open(g_zfs, argv[0], ZFS_TYPE_SNAPSHOT)) == NULL)
1700 		return (1);
1701 
1702 	/* open the parent dataset */
1703 	(void) strlcpy(parentname, argv[0], sizeof (parentname));
1704 	verify((delim = strrchr(parentname, '@')) != NULL);
1705 	*delim = '\0';
1706 	if ((zhp = zfs_open(g_zfs, parentname, ZFS_TYPE_ANY)) == NULL) {
1707 		zfs_close(snap);
1708 		return (1);
1709 	}
1710 
1711 	/*
1712 	 * Check for more recent snapshots and/or clones based on the presence
1713 	 * of '-r' and '-R'.
1714 	 */
1715 	cb.cb_target = argv[0];
1716 	cb.cb_create = zfs_prop_get_int(snap, ZFS_PROP_CREATETXG);
1717 	cb.cb_first = B_TRUE;
1718 	cb.cb_error = 0;
1719 	if ((ret = zfs_iter_children(zhp, rollback_check, &cb)) != 0)
1720 		goto out;
1721 
1722 	if ((ret = cb.cb_error) != 0)
1723 		goto out;
1724 
1725 	/*
1726 	 * Rollback parent to the given snapshot.
1727 	 */
1728 	ret = zfs_rollback(zhp, snap, force);
1729 
1730 	if (!ret) {
1731 		zpool_log_history(g_zfs, argc + optind, argv - optind, argv[0],
1732 		    B_FALSE, B_FALSE);
1733 	}
1734 
1735 out:
1736 	zfs_close(snap);
1737 	zfs_close(zhp);
1738 
1739 	if (ret == 0)
1740 		return (0);
1741 	else
1742 		return (1);
1743 }
1744 
1745 /*
1746  * zfs set property=value { fs | snap | vol } ...
1747  *
1748  * Sets the given property for all datasets specified on the command line.
1749  */
1750 typedef struct set_cbdata {
1751 	char		*cb_propname;
1752 	char		*cb_value;
1753 	boolean_t	cb_any_successful;
1754 } set_cbdata_t;
1755 
1756 static int
1757 set_callback(zfs_handle_t *zhp, void *data)
1758 {
1759 	set_cbdata_t *cbp = data;
1760 
1761 	if (zfs_prop_set(zhp, cbp->cb_propname, cbp->cb_value) != 0) {
1762 		switch (libzfs_errno(g_zfs)) {
1763 		case EZFS_MOUNTFAILED:
1764 			(void) fprintf(stderr, gettext("property may be set "
1765 			    "but unable to remount filesystem\n"));
1766 			break;
1767 		case EZFS_SHARENFSFAILED:
1768 			(void) fprintf(stderr, gettext("property may be set "
1769 			    "but unable to reshare filesystem\n"));
1770 			break;
1771 		}
1772 		return (1);
1773 	}
1774 	cbp->cb_any_successful = B_TRUE;
1775 	return (0);
1776 }
1777 
1778 static int
1779 zfs_do_set(int argc, char **argv)
1780 {
1781 	set_cbdata_t cb;
1782 	int ret;
1783 
1784 	/* check for options */
1785 	if (argc > 1 && argv[1][0] == '-') {
1786 		(void) fprintf(stderr, gettext("invalid option '%c'\n"),
1787 		    argv[1][1]);
1788 		usage(B_FALSE);
1789 	}
1790 
1791 	/* check number of arguments */
1792 	if (argc < 2) {
1793 		(void) fprintf(stderr, gettext("missing property=value "
1794 		    "argument\n"));
1795 		usage(B_FALSE);
1796 	}
1797 	if (argc < 3) {
1798 		(void) fprintf(stderr, gettext("missing dataset name\n"));
1799 		usage(B_FALSE);
1800 	}
1801 
1802 	/* validate property=value argument */
1803 	cb.cb_propname = argv[1];
1804 	if ((cb.cb_value = strchr(cb.cb_propname, '=')) == NULL) {
1805 		(void) fprintf(stderr, gettext("missing value in "
1806 		    "property=value argument\n"));
1807 		usage(B_FALSE);
1808 	}
1809 
1810 	*cb.cb_value = '\0';
1811 	cb.cb_value++;
1812 	cb.cb_any_successful = B_FALSE;
1813 
1814 	if (*cb.cb_propname == '\0') {
1815 		(void) fprintf(stderr,
1816 		    gettext("missing property in property=value argument\n"));
1817 		usage(B_FALSE);
1818 	}
1819 
1820 	ret = zfs_for_each(argc - 2, argv + 2, B_FALSE,
1821 	    ZFS_TYPE_ANY, NULL, NULL, set_callback, &cb, B_FALSE);
1822 
1823 	if (cb.cb_any_successful) {
1824 		*(cb.cb_value - 1) = '=';
1825 		zpool_log_history(g_zfs, argc, argv, argv[2], B_FALSE, B_FALSE);
1826 	}
1827 
1828 	return (ret);
1829 }
1830 
1831 /*
1832  * zfs snapshot [-r] <fs@snap>
1833  *
1834  * Creates a snapshot with the given name.  While functionally equivalent to
1835  * 'zfs create', it is a separate command to diffferentiate intent.
1836  */
1837 static int
1838 zfs_do_snapshot(int argc, char **argv)
1839 {
1840 	int recursive = B_FALSE;
1841 	int ret;
1842 	char c;
1843 
1844 	/* check options */
1845 	while ((c = getopt(argc, argv, ":r")) != -1) {
1846 		switch (c) {
1847 		case 'r':
1848 			recursive = B_TRUE;
1849 			break;
1850 		case '?':
1851 			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
1852 			    optopt);
1853 			usage(B_FALSE);
1854 		}
1855 	}
1856 
1857 	argc -= optind;
1858 	argv += optind;
1859 
1860 	/* check number of arguments */
1861 	if (argc < 1) {
1862 		(void) fprintf(stderr, gettext("missing snapshot argument\n"));
1863 		usage(B_FALSE);
1864 	}
1865 	if (argc > 1) {
1866 		(void) fprintf(stderr, gettext("too many arguments\n"));
1867 		usage(B_FALSE);
1868 	}
1869 
1870 	ret = zfs_snapshot(g_zfs, argv[0], recursive);
1871 	if (ret && recursive)
1872 		(void) fprintf(stderr, gettext("no snapshots were created\n"));
1873 	if (!ret) {
1874 		zpool_log_history(g_zfs, argc + optind, argv - optind, argv[0],
1875 		    B_FALSE, B_FALSE);
1876 	}
1877 	return (ret != 0);
1878 }
1879 
1880 /*
1881  * zfs send [-i <@snap>] <fs@snap>
1882  *
1883  * Send a backup stream to stdout.
1884  */
1885 static int
1886 zfs_do_send(int argc, char **argv)
1887 {
1888 	char *fromname = NULL;
1889 	char *cp;
1890 	zfs_handle_t *zhp;
1891 	int c, err;
1892 
1893 	/* check options */
1894 	while ((c = getopt(argc, argv, ":i:")) != -1) {
1895 		switch (c) {
1896 		case 'i':
1897 			if (fromname)
1898 				usage(B_FALSE);
1899 			fromname = optarg;
1900 			break;
1901 		case ':':
1902 			(void) fprintf(stderr, gettext("missing argument for "
1903 			    "'%c' option\n"), optopt);
1904 			usage(B_FALSE);
1905 			break;
1906 		case '?':
1907 			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
1908 			    optopt);
1909 			usage(B_FALSE);
1910 		}
1911 	}
1912 
1913 	argc -= optind;
1914 	argv += optind;
1915 
1916 	/* check number of arguments */
1917 	if (argc < 1) {
1918 		(void) fprintf(stderr, gettext("missing snapshot argument\n"));
1919 		usage(B_FALSE);
1920 	}
1921 	if (argc > 1) {
1922 		(void) fprintf(stderr, gettext("too many arguments\n"));
1923 		usage(B_FALSE);
1924 	}
1925 
1926 	if (isatty(STDOUT_FILENO)) {
1927 		(void) fprintf(stderr,
1928 		    gettext("Error: Stream can not be written to a terminal.\n"
1929 		    "You must redirect standard output.\n"));
1930 		return (1);
1931 	}
1932 
1933 	if ((zhp = zfs_open(g_zfs, argv[0], ZFS_TYPE_SNAPSHOT)) == NULL)
1934 		return (1);
1935 
1936 	/*
1937 	 * If they specified the full path to the snapshot, chop off
1938 	 * everything except the short name of the snapshot.
1939 	 */
1940 	if (fromname && (cp = strchr(fromname, '@')) != NULL) {
1941 		if (cp != fromname &&
1942 		    strncmp(argv[0], fromname, cp - fromname + 1)) {
1943 			(void) fprintf(stderr,
1944 			    gettext("incremental source must be "
1945 			    "in same filesystem\n"));
1946 			usage(B_FALSE);
1947 		}
1948 		fromname = cp + 1;
1949 		if (strchr(fromname, '@') || strchr(fromname, '/')) {
1950 			(void) fprintf(stderr,
1951 			    gettext("invalid incremental source\n"));
1952 			usage(B_FALSE);
1953 		}
1954 	}
1955 
1956 	err = zfs_send(zhp, fromname, STDOUT_FILENO);
1957 	zfs_close(zhp);
1958 
1959 	return (err != 0);
1960 }
1961 
1962 /*
1963  * zfs receive <fs@snap>
1964  *
1965  * Restore a backup stream from stdin.
1966  */
1967 static int
1968 zfs_do_receive(int argc, char **argv)
1969 {
1970 	int c, err;
1971 	boolean_t isprefix = B_FALSE;
1972 	boolean_t dryrun = B_FALSE;
1973 	boolean_t verbose = B_FALSE;
1974 	boolean_t force = B_FALSE;
1975 
1976 	/* check options */
1977 	while ((c = getopt(argc, argv, ":dnvF")) != -1) {
1978 		switch (c) {
1979 		case 'd':
1980 			isprefix = B_TRUE;
1981 			break;
1982 		case 'n':
1983 			dryrun = B_TRUE;
1984 			break;
1985 		case 'v':
1986 			verbose = B_TRUE;
1987 			break;
1988 		case 'F':
1989 			force = B_TRUE;
1990 			break;
1991 		case ':':
1992 			(void) fprintf(stderr, gettext("missing argument for "
1993 			    "'%c' option\n"), optopt);
1994 			usage(B_FALSE);
1995 			break;
1996 		case '?':
1997 			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
1998 			    optopt);
1999 			usage(B_FALSE);
2000 		}
2001 	}
2002 
2003 	argc -= optind;
2004 	argv += optind;
2005 
2006 	/* check number of arguments */
2007 	if (argc < 1) {
2008 		(void) fprintf(stderr, gettext("missing snapshot argument\n"));
2009 		usage(B_FALSE);
2010 	}
2011 	if (argc > 1) {
2012 		(void) fprintf(stderr, gettext("too many arguments\n"));
2013 		usage(B_FALSE);
2014 	}
2015 
2016 	if (isatty(STDIN_FILENO)) {
2017 		(void) fprintf(stderr,
2018 		    gettext("Error: Backup stream can not be read "
2019 		    "from a terminal.\n"
2020 		    "You must redirect standard input.\n"));
2021 		return (1);
2022 	}
2023 
2024 	err = zfs_receive(g_zfs, argv[0], isprefix, verbose, dryrun, force,
2025 	    STDIN_FILENO);
2026 
2027 	if (!err) {
2028 		zpool_log_history(g_zfs, argc + optind, argv - optind, argv[0],
2029 		    B_FALSE, B_FALSE);
2030 	}
2031 
2032 	return (err != 0);
2033 }
2034 
2035 typedef struct get_all_cbdata {
2036 	zfs_handle_t	**cb_handles;
2037 	size_t		cb_alloc;
2038 	size_t		cb_used;
2039 	uint_t		cb_types;
2040 } get_all_cbdata_t;
2041 
2042 static int
2043 get_one_dataset(zfs_handle_t *zhp, void *data)
2044 {
2045 	get_all_cbdata_t *cbp = data;
2046 	zfs_type_t type = zfs_get_type(zhp);
2047 
2048 	/*
2049 	 * Interate over any nested datasets.
2050 	 */
2051 	if (type == ZFS_TYPE_FILESYSTEM &&
2052 	    zfs_iter_filesystems(zhp, get_one_dataset, data) != 0) {
2053 		zfs_close(zhp);
2054 		return (1);
2055 	}
2056 
2057 	/*
2058 	 * Skip any datasets whose type does not match.
2059 	 */
2060 	if ((type & cbp->cb_types) == 0) {
2061 		zfs_close(zhp);
2062 		return (0);
2063 	}
2064 
2065 	if (cbp->cb_alloc == cbp->cb_used) {
2066 		zfs_handle_t **handles;
2067 
2068 		if (cbp->cb_alloc == 0)
2069 			cbp->cb_alloc = 64;
2070 		else
2071 			cbp->cb_alloc *= 2;
2072 
2073 		handles = safe_malloc(cbp->cb_alloc * sizeof (void *));
2074 
2075 		if (cbp->cb_handles) {
2076 			bcopy(cbp->cb_handles, handles,
2077 			    cbp->cb_used * sizeof (void *));
2078 			free(cbp->cb_handles);
2079 		}
2080 
2081 		cbp->cb_handles = handles;
2082 	}
2083 
2084 	cbp->cb_handles[cbp->cb_used++] = zhp;
2085 
2086 	return (0);
2087 }
2088 
2089 static void
2090 get_all_datasets(uint_t types, zfs_handle_t ***dslist, size_t *count)
2091 {
2092 	get_all_cbdata_t cb = { 0 };
2093 	cb.cb_types = types;
2094 
2095 	(void) zfs_iter_root(g_zfs, get_one_dataset, &cb);
2096 
2097 	*dslist = cb.cb_handles;
2098 	*count = cb.cb_used;
2099 }
2100 
2101 static int
2102 dataset_cmp(const void *a, const void *b)
2103 {
2104 	zfs_handle_t **za = (zfs_handle_t **)a;
2105 	zfs_handle_t **zb = (zfs_handle_t **)b;
2106 	char mounta[MAXPATHLEN];
2107 	char mountb[MAXPATHLEN];
2108 	boolean_t gota, gotb;
2109 
2110 	if ((gota = (zfs_get_type(*za) == ZFS_TYPE_FILESYSTEM)) != 0)
2111 		verify(zfs_prop_get(*za, ZFS_PROP_MOUNTPOINT, mounta,
2112 		    sizeof (mounta), NULL, NULL, 0, B_FALSE) == 0);
2113 	if ((gotb = (zfs_get_type(*zb) == ZFS_TYPE_FILESYSTEM)) != 0)
2114 		verify(zfs_prop_get(*zb, ZFS_PROP_MOUNTPOINT, mountb,
2115 		    sizeof (mountb), NULL, NULL, 0, B_FALSE) == 0);
2116 
2117 	if (gota && gotb)
2118 		return (strcmp(mounta, mountb));
2119 
2120 	if (gota)
2121 		return (-1);
2122 	if (gotb)
2123 		return (1);
2124 
2125 	return (strcmp(zfs_get_name(a), zfs_get_name(b)));
2126 }
2127 
2128 /*
2129  * Generic callback for sharing or mounting filesystems.  Because the code is so
2130  * similar, we have a common function with an extra parameter to determine which
2131  * mode we are using.
2132  */
2133 #define	OP_SHARE	0x1
2134 #define	OP_MOUNT	0x2
2135 
2136 /*
2137  * Share or mount a dataset.
2138  */
2139 static int
2140 share_mount_one(zfs_handle_t *zhp, int op, int flags, boolean_t explicit,
2141     const char *options)
2142 {
2143 	char mountpoint[ZFS_MAXPROPLEN];
2144 	char shareopts[ZFS_MAXPROPLEN];
2145 	const char *cmdname = op == OP_SHARE ? "share" : "mount";
2146 	struct mnttab mnt;
2147 	uint64_t zoned, canmount;
2148 	zfs_type_t type = zfs_get_type(zhp);
2149 
2150 	assert(type & (ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME));
2151 
2152 	if (type == ZFS_TYPE_FILESYSTEM) {
2153 		/*
2154 		 * Check to make sure we can mount/share this dataset.  If we
2155 		 * are in the global zone and the filesystem is exported to a
2156 		 * local zone, or if we are in a local zone and the
2157 		 * filesystem is not exported, then it is an error.
2158 		 */
2159 		zoned = zfs_prop_get_int(zhp, ZFS_PROP_ZONED);
2160 
2161 		if (zoned && getzoneid() == GLOBAL_ZONEID) {
2162 			if (!explicit)
2163 				return (0);
2164 
2165 			(void) fprintf(stderr, gettext("cannot %s '%s': "
2166 			    "dataset is exported to a local zone\n"), cmdname,
2167 			    zfs_get_name(zhp));
2168 			return (1);
2169 
2170 		} else if (!zoned && getzoneid() != GLOBAL_ZONEID) {
2171 			if (!explicit)
2172 				return (0);
2173 
2174 			(void) fprintf(stderr, gettext("cannot %s '%s': "
2175 			    "permission denied\n"), cmdname,
2176 			    zfs_get_name(zhp));
2177 			return (1);
2178 		}
2179 
2180 		/*
2181 		 * Ignore any filesystems which don't apply to us. This
2182 		 * includes those with a legacy mountpoint, or those with
2183 		 * legacy share options.
2184 		 */
2185 		verify(zfs_prop_get(zhp, ZFS_PROP_MOUNTPOINT, mountpoint,
2186 		    sizeof (mountpoint), NULL, NULL, 0, B_FALSE) == 0);
2187 		verify(zfs_prop_get(zhp, ZFS_PROP_SHARENFS, shareopts,
2188 		    sizeof (shareopts), NULL, NULL, 0, B_FALSE) == 0);
2189 		canmount = zfs_prop_get_int(zhp, ZFS_PROP_CANMOUNT);
2190 
2191 		if (op == OP_SHARE && strcmp(shareopts, "off") == 0) {
2192 			if (!explicit)
2193 				return (0);
2194 
2195 			(void) fprintf(stderr, gettext("cannot share '%s': "
2196 			    "legacy share\n"), zfs_get_name(zhp));
2197 			(void) fprintf(stderr, gettext("use share(1M) to "
2198 			    "share this filesystem\n"));
2199 			return (1);
2200 		}
2201 
2202 		/*
2203 		 * We cannot share or mount legacy filesystems. If the
2204 		 * shareopts is non-legacy but the mountpoint is legacy, we
2205 		 * treat it as a legacy share.
2206 		 */
2207 		if (strcmp(mountpoint, "legacy") == 0) {
2208 			if (!explicit)
2209 				return (0);
2210 
2211 			(void) fprintf(stderr, gettext("cannot %s '%s': "
2212 			    "legacy mountpoint\n"), cmdname, zfs_get_name(zhp));
2213 			(void) fprintf(stderr, gettext("use %s to "
2214 			    "%s this filesystem\n"), op == OP_SHARE ?
2215 			    "share(1M)" : "mount(1M)", cmdname);
2216 			return (1);
2217 		}
2218 
2219 		if (strcmp(mountpoint, "none") == 0) {
2220 			if (!explicit)
2221 				return (0);
2222 
2223 			(void) fprintf(stderr, gettext("cannot %s '%s': no "
2224 			    "mountpoint set\n"), cmdname, zfs_get_name(zhp));
2225 			return (1);
2226 		}
2227 
2228 		if (!canmount) {
2229 			if (!explicit)
2230 				return (0);
2231 
2232 			(void) fprintf(stderr, gettext("cannot %s '%s': "
2233 			    "'canmount' property is set to 'off'\n"), cmdname,
2234 			    zfs_get_name(zhp));
2235 			return (1);
2236 		}
2237 
2238 		/*
2239 		 * At this point, we have verified that the mountpoint and/or
2240 		 * shareopts are appropriate for auto management. If the
2241 		 * filesystem is already mounted or shared, return (failing
2242 		 * for explicit requests); otherwise mount or share the
2243 		 * filesystem.
2244 		 */
2245 		switch (op) {
2246 		case OP_SHARE:
2247 			if (zfs_is_shared_nfs(zhp, NULL)) {
2248 				if (!explicit)
2249 					return (0);
2250 
2251 				(void) fprintf(stderr, gettext("cannot share "
2252 				    "'%s': filesystem already shared\n"),
2253 				    zfs_get_name(zhp));
2254 				return (1);
2255 			}
2256 
2257 			if (!zfs_is_mounted(zhp, NULL) &&
2258 			    zfs_mount(zhp, NULL, 0) != 0)
2259 				return (1);
2260 
2261 			if (zfs_share_nfs(zhp) != 0)
2262 				return (1);
2263 			break;
2264 
2265 		case OP_MOUNT:
2266 			if (options == NULL)
2267 				mnt.mnt_mntopts = "";
2268 			else
2269 				mnt.mnt_mntopts = (char *)options;
2270 
2271 			if (!hasmntopt(&mnt, MNTOPT_REMOUNT) &&
2272 			    zfs_is_mounted(zhp, NULL)) {
2273 				if (!explicit)
2274 					return (0);
2275 
2276 				(void) fprintf(stderr, gettext("cannot mount "
2277 				    "'%s': filesystem already mounted\n"),
2278 				    zfs_get_name(zhp));
2279 				return (1);
2280 			}
2281 
2282 			if (zfs_mount(zhp, options, flags) != 0)
2283 				return (1);
2284 			break;
2285 		}
2286 	} else {
2287 		assert(op == OP_SHARE);
2288 
2289 		/*
2290 		 * Ignore any volumes that aren't shared.
2291 		 */
2292 		verify(zfs_prop_get(zhp, ZFS_PROP_SHAREISCSI, shareopts,
2293 		    sizeof (shareopts), NULL, NULL, 0, B_FALSE) == 0);
2294 
2295 		if (strcmp(shareopts, "off") == 0) {
2296 			if (!explicit)
2297 				return (0);
2298 
2299 			(void) fprintf(stderr, gettext("cannot share '%s': "
2300 			    "'shareiscsi' property not set\n"),
2301 			    zfs_get_name(zhp));
2302 			(void) fprintf(stderr, gettext("set 'shareiscsi' "
2303 			    "property or use iscsitadm(1M) to share this "
2304 			    "volume\n"));
2305 			return (1);
2306 		}
2307 
2308 		if (zfs_is_shared_iscsi(zhp)) {
2309 			if (!explicit)
2310 				return (0);
2311 
2312 			(void) fprintf(stderr, gettext("cannot share "
2313 			    "'%s': volume already shared\n"),
2314 			    zfs_get_name(zhp));
2315 			return (1);
2316 		}
2317 
2318 		if (zfs_share_iscsi(zhp) != 0)
2319 			return (1);
2320 	}
2321 
2322 	return (0);
2323 }
2324 
2325 static int
2326 share_mount(int op, int argc, char **argv)
2327 {
2328 	int do_all = 0;
2329 	int c, ret = 0;
2330 	const char *options = NULL;
2331 	int types, flags = 0;
2332 
2333 	/* check options */
2334 	while ((c = getopt(argc, argv, op == OP_MOUNT ? ":ao:O" : "a"))
2335 	    != -1) {
2336 		switch (c) {
2337 		case 'a':
2338 			do_all = 1;
2339 			break;
2340 		case 'o':
2341 			options = optarg;
2342 			break;
2343 		case 'O':
2344 			flags |= MS_OVERLAY;
2345 			break;
2346 		case ':':
2347 			(void) fprintf(stderr, gettext("missing argument for "
2348 			    "'%c' option\n"), optopt);
2349 			usage(B_FALSE);
2350 			break;
2351 		case '?':
2352 			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
2353 			    optopt);
2354 			usage(B_FALSE);
2355 		}
2356 	}
2357 
2358 	argc -= optind;
2359 	argv += optind;
2360 
2361 	/* check number of arguments */
2362 	if (do_all) {
2363 		zfs_handle_t **dslist = NULL;
2364 		size_t i, count = 0;
2365 
2366 		if (op == OP_MOUNT) {
2367 			types = ZFS_TYPE_FILESYSTEM;
2368 		} else if (argc > 0) {
2369 			if (strcmp(argv[0], "nfs") == 0) {
2370 				types = ZFS_TYPE_FILESYSTEM;
2371 			} else if (strcmp(argv[0], "iscsi") == 0) {
2372 				types = ZFS_TYPE_VOLUME;
2373 			} else {
2374 				(void) fprintf(stderr, gettext("share type "
2375 				    "must be 'nfs' or 'iscsi'\n"));
2376 				usage(B_FALSE);
2377 			}
2378 
2379 			argc--;
2380 			argv++;
2381 		} else {
2382 			types = ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME;
2383 		}
2384 
2385 		if (argc != 0) {
2386 			(void) fprintf(stderr, gettext("too many arguments\n"));
2387 			usage(B_FALSE);
2388 		}
2389 
2390 		get_all_datasets(types, &dslist, &count);
2391 
2392 		if (count == 0)
2393 			return (0);
2394 
2395 		qsort(dslist, count, sizeof (void *), dataset_cmp);
2396 
2397 		for (i = 0; i < count; i++) {
2398 			if (share_mount_one(dslist[i], op, flags, B_FALSE,
2399 			    options) != 0)
2400 				ret = 1;
2401 			zfs_close(dslist[i]);
2402 		}
2403 
2404 		free(dslist);
2405 	} else if (argc == 0) {
2406 		struct mnttab entry;
2407 
2408 		if (op == OP_SHARE) {
2409 			(void) fprintf(stderr, gettext("missing filesystem "
2410 			    "argument\n"));
2411 			usage(B_FALSE);
2412 		}
2413 
2414 		/*
2415 		 * When mount is given no arguments, go through /etc/mnttab and
2416 		 * display any active ZFS mounts.  We hide any snapshots, since
2417 		 * they are controlled automatically.
2418 		 */
2419 		rewind(mnttab_file);
2420 		while (getmntent(mnttab_file, &entry) == 0) {
2421 			if (strcmp(entry.mnt_fstype, MNTTYPE_ZFS) != 0 ||
2422 			    strchr(entry.mnt_special, '@') != NULL)
2423 				continue;
2424 
2425 			(void) printf("%-30s  %s\n", entry.mnt_special,
2426 			    entry.mnt_mountp);
2427 		}
2428 
2429 	} else {
2430 		zfs_handle_t *zhp;
2431 
2432 		types = ZFS_TYPE_FILESYSTEM;
2433 		if (op == OP_SHARE)
2434 			types |= ZFS_TYPE_VOLUME;
2435 
2436 		if (argc > 1) {
2437 			(void) fprintf(stderr,
2438 			    gettext("too many arguments\n"));
2439 			usage(B_FALSE);
2440 		}
2441 
2442 		if ((zhp = zfs_open(g_zfs, argv[0], types)) == NULL) {
2443 			ret = 1;
2444 		} else {
2445 			ret = share_mount_one(zhp, op, flags, B_TRUE,
2446 			    options);
2447 			zfs_close(zhp);
2448 		}
2449 	}
2450 
2451 	return (ret);
2452 }
2453 
2454 /*
2455  * zfs mount -a [nfs | iscsi]
2456  * zfs mount filesystem
2457  *
2458  * Mount all filesystems, or mount the given filesystem.
2459  */
2460 static int
2461 zfs_do_mount(int argc, char **argv)
2462 {
2463 	return (share_mount(OP_MOUNT, argc, argv));
2464 }
2465 
2466 /*
2467  * zfs share -a [nfs | iscsi]
2468  * zfs share filesystem
2469  *
2470  * Share all filesystems, or share the given filesystem.
2471  */
2472 static int
2473 zfs_do_share(int argc, char **argv)
2474 {
2475 	return (share_mount(OP_SHARE, argc, argv));
2476 }
2477 
2478 typedef struct unshare_unmount_node {
2479 	zfs_handle_t	*un_zhp;
2480 	char		*un_mountp;
2481 	uu_avl_node_t	un_avlnode;
2482 } unshare_unmount_node_t;
2483 
2484 /* ARGSUSED */
2485 static int
2486 unshare_unmount_compare(const void *larg, const void *rarg, void *unused)
2487 {
2488 	const unshare_unmount_node_t *l = larg;
2489 	const unshare_unmount_node_t *r = rarg;
2490 
2491 	return (strcmp(l->un_mountp, r->un_mountp));
2492 }
2493 
2494 /*
2495  * Convenience routine used by zfs_do_umount() and manual_unmount().  Given an
2496  * absolute path, find the entry /etc/mnttab, verify that its a ZFS filesystem,
2497  * and unmount it appropriately.
2498  */
2499 static int
2500 unshare_unmount_path(int op, char *path, int flags, boolean_t is_manual)
2501 {
2502 	zfs_handle_t *zhp;
2503 	int ret;
2504 	struct stat64 statbuf;
2505 	struct extmnttab entry;
2506 	const char *cmdname = (op == OP_SHARE) ? "unshare" : "unmount";
2507 	char property[ZFS_MAXPROPLEN];
2508 
2509 	/*
2510 	 * Search for the path in /etc/mnttab.  Rather than looking for the
2511 	 * specific path, which can be fooled by non-standard paths (i.e. ".."
2512 	 * or "//"), we stat() the path and search for the corresponding
2513 	 * (major,minor) device pair.
2514 	 */
2515 	if (stat64(path, &statbuf) != 0) {
2516 		(void) fprintf(stderr, gettext("cannot %s '%s': %s\n"),
2517 		    cmdname, path, strerror(errno));
2518 		return (1);
2519 	}
2520 
2521 	/*
2522 	 * Search for the given (major,minor) pair in the mount table.
2523 	 */
2524 	rewind(mnttab_file);
2525 	while ((ret = getextmntent(mnttab_file, &entry, 0)) == 0) {
2526 		if (entry.mnt_major == major(statbuf.st_dev) &&
2527 		    entry.mnt_minor == minor(statbuf.st_dev))
2528 			break;
2529 	}
2530 	if (ret != 0) {
2531 		(void) fprintf(stderr, gettext("cannot %s '%s': not "
2532 		    "currently mounted\n"), cmdname, path);
2533 		return (1);
2534 	}
2535 
2536 	if (strcmp(entry.mnt_fstype, MNTTYPE_ZFS) != 0) {
2537 		(void) fprintf(stderr, gettext("cannot %s '%s': not a ZFS "
2538 		    "filesystem\n"), cmdname, path);
2539 		return (1);
2540 	}
2541 
2542 	if ((zhp = zfs_open(g_zfs, entry.mnt_special,
2543 	    ZFS_TYPE_FILESYSTEM)) == NULL)
2544 		return (1);
2545 
2546 	verify(zfs_prop_get(zhp, op == OP_SHARE ?
2547 	    ZFS_PROP_SHARENFS : ZFS_PROP_MOUNTPOINT, property,
2548 	    sizeof (property), NULL, NULL, 0, B_FALSE) == 0);
2549 
2550 	if (op == OP_SHARE) {
2551 		if (strcmp(property, "off") == 0) {
2552 			(void) fprintf(stderr, gettext("cannot unshare "
2553 			    "'%s': legacy share\n"), path);
2554 			(void) fprintf(stderr, gettext("use "
2555 			    "unshare(1M) to unshare this filesystem\n"));
2556 			ret = 1;
2557 		} else if (!zfs_is_shared_nfs(zhp, NULL)) {
2558 			(void) fprintf(stderr, gettext("cannot unshare '%s': "
2559 			    "not currently shared\n"), path);
2560 			ret = 1;
2561 		} else {
2562 			ret = zfs_unshareall_nfs(zhp);
2563 		}
2564 	} else {
2565 		if (is_manual) {
2566 			ret = zfs_unmount(zhp, NULL, flags);
2567 		} else if (strcmp(property, "legacy") == 0) {
2568 			(void) fprintf(stderr, gettext("cannot unmount "
2569 			    "'%s': legacy mountpoint\n"),
2570 			    zfs_get_name(zhp));
2571 			(void) fprintf(stderr, gettext("use umount(1M) "
2572 			    "to unmount this filesystem\n"));
2573 			ret = 1;
2574 		} else {
2575 			ret = zfs_unmountall(zhp, flags);
2576 		}
2577 	}
2578 
2579 	zfs_close(zhp);
2580 
2581 	return (ret != 0);
2582 }
2583 
2584 /*
2585  * Generic callback for unsharing or unmounting a filesystem.
2586  */
2587 static int
2588 unshare_unmount(int op, int argc, char **argv)
2589 {
2590 	int do_all = 0;
2591 	int flags = 0;
2592 	int ret = 0;
2593 	int types, c;
2594 	zfs_handle_t *zhp;
2595 	char property[ZFS_MAXPROPLEN];
2596 
2597 	/* check options */
2598 	while ((c = getopt(argc, argv, op == OP_SHARE ? "a" : "af")) != -1) {
2599 		switch (c) {
2600 		case 'a':
2601 			do_all = 1;
2602 			break;
2603 		case 'f':
2604 			flags = MS_FORCE;
2605 			break;
2606 		case '?':
2607 			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
2608 			    optopt);
2609 			usage(B_FALSE);
2610 		}
2611 	}
2612 
2613 	argc -= optind;
2614 	argv += optind;
2615 
2616 	if (do_all) {
2617 		/*
2618 		 * We could make use of zfs_for_each() to walk all datasets in
2619 		 * the system, but this would be very inefficient, especially
2620 		 * since we would have to linearly search /etc/mnttab for each
2621 		 * one.  Instead, do one pass through /etc/mnttab looking for
2622 		 * zfs entries and call zfs_unmount() for each one.
2623 		 *
2624 		 * Things get a little tricky if the administrator has created
2625 		 * mountpoints beneath other ZFS filesystems.  In this case, we
2626 		 * have to unmount the deepest filesystems first.  To accomplish
2627 		 * this, we place all the mountpoints in an AVL tree sorted by
2628 		 * the special type (dataset name), and walk the result in
2629 		 * reverse to make sure to get any snapshots first.
2630 		 */
2631 		struct mnttab entry;
2632 		uu_avl_pool_t *pool;
2633 		uu_avl_t *tree;
2634 		unshare_unmount_node_t *node;
2635 		uu_avl_index_t idx;
2636 		uu_avl_walk_t *walk;
2637 
2638 		if (argc != 0) {
2639 			(void) fprintf(stderr, gettext("too many arguments\n"));
2640 			usage(B_FALSE);
2641 		}
2642 
2643 		if ((pool = uu_avl_pool_create("unmount_pool",
2644 		    sizeof (unshare_unmount_node_t),
2645 		    offsetof(unshare_unmount_node_t, un_avlnode),
2646 		    unshare_unmount_compare,
2647 		    UU_DEFAULT)) == NULL) {
2648 			(void) fprintf(stderr, gettext("internal error: "
2649 			    "out of memory\n"));
2650 			exit(1);
2651 		}
2652 
2653 		if ((tree = uu_avl_create(pool, NULL, UU_DEFAULT)) == NULL) {
2654 			(void) fprintf(stderr, gettext("internal error: "
2655 			    "out of memory\n"));
2656 			exit(1);
2657 		}
2658 
2659 		rewind(mnttab_file);
2660 		while (getmntent(mnttab_file, &entry) == 0) {
2661 
2662 			/* ignore non-ZFS entries */
2663 			if (strcmp(entry.mnt_fstype, MNTTYPE_ZFS) != 0)
2664 				continue;
2665 
2666 			/* ignore snapshots */
2667 			if (strchr(entry.mnt_special, '@') != NULL)
2668 				continue;
2669 
2670 			if ((zhp = zfs_open(g_zfs, entry.mnt_special,
2671 			    ZFS_TYPE_FILESYSTEM)) == NULL) {
2672 				ret = 1;
2673 				continue;
2674 			}
2675 
2676 			verify(zfs_prop_get(zhp, op == OP_SHARE ?
2677 			    ZFS_PROP_SHARENFS : ZFS_PROP_MOUNTPOINT,
2678 			    property, sizeof (property), NULL, NULL,
2679 			    0, B_FALSE) == 0);
2680 
2681 			/* Ignore legacy mounts and shares */
2682 			if ((op == OP_SHARE &&
2683 			    strcmp(property, "off") == 0) ||
2684 			    (op == OP_MOUNT &&
2685 			    strcmp(property, "legacy") == 0)) {
2686 				zfs_close(zhp);
2687 				continue;
2688 			}
2689 
2690 			node = safe_malloc(sizeof (unshare_unmount_node_t));
2691 			node->un_zhp = zhp;
2692 
2693 			if ((node->un_mountp = strdup(entry.mnt_mountp)) ==
2694 			    NULL) {
2695 				(void) fprintf(stderr, gettext("internal error:"
2696 				    " out of memory\n"));
2697 				exit(1);
2698 			}
2699 
2700 			uu_avl_node_init(node, &node->un_avlnode, pool);
2701 
2702 			if (uu_avl_find(tree, node, NULL, &idx) == NULL) {
2703 				uu_avl_insert(tree, node, idx);
2704 			} else {
2705 				zfs_close(node->un_zhp);
2706 				free(node->un_mountp);
2707 				free(node);
2708 			}
2709 		}
2710 
2711 		/*
2712 		 * Walk the AVL tree in reverse, unmounting each filesystem and
2713 		 * removing it from the AVL tree in the process.
2714 		 */
2715 		if ((walk = uu_avl_walk_start(tree,
2716 		    UU_WALK_REVERSE | UU_WALK_ROBUST)) == NULL) {
2717 			(void) fprintf(stderr,
2718 			    gettext("internal error: out of memory"));
2719 			exit(1);
2720 		}
2721 
2722 		while ((node = uu_avl_walk_next(walk)) != NULL) {
2723 			uu_avl_remove(tree, node);
2724 
2725 			switch (op) {
2726 			case OP_SHARE:
2727 				if (zfs_unshare_nfs(node->un_zhp,
2728 				    node->un_mountp) != 0)
2729 					ret = 1;
2730 				break;
2731 
2732 			case OP_MOUNT:
2733 				if (zfs_unmount(node->un_zhp,
2734 				    node->un_mountp, flags) != 0)
2735 					ret = 1;
2736 				break;
2737 			}
2738 
2739 			zfs_close(node->un_zhp);
2740 			free(node->un_mountp);
2741 			free(node);
2742 		}
2743 
2744 		uu_avl_walk_end(walk);
2745 		uu_avl_destroy(tree);
2746 		uu_avl_pool_destroy(pool);
2747 
2748 		if (op == OP_SHARE) {
2749 			/*
2750 			 * Finally, unshare any volumes shared via iSCSI.
2751 			 */
2752 			zfs_handle_t **dslist = NULL;
2753 			size_t i, count = 0;
2754 
2755 			get_all_datasets(ZFS_TYPE_VOLUME, &dslist, &count);
2756 
2757 			if (count != 0) {
2758 				qsort(dslist, count, sizeof (void *),
2759 				    dataset_cmp);
2760 
2761 				for (i = 0; i < count; i++) {
2762 					if (zfs_unshare_iscsi(dslist[i]) != 0)
2763 						ret = 1;
2764 					zfs_close(dslist[i]);
2765 				}
2766 
2767 				free(dslist);
2768 			}
2769 		}
2770 	} else {
2771 		if (argc != 1) {
2772 			if (argc == 0)
2773 				(void) fprintf(stderr,
2774 				    gettext("missing filesystem argument\n"));
2775 			else
2776 				(void) fprintf(stderr,
2777 				    gettext("too many arguments\n"));
2778 			usage(B_FALSE);
2779 		}
2780 
2781 		/*
2782 		 * We have an argument, but it may be a full path or a ZFS
2783 		 * filesystem.  Pass full paths off to unmount_path() (shared by
2784 		 * manual_unmount), otherwise open the filesystem and pass to
2785 		 * zfs_unmount().
2786 		 */
2787 		if (argv[0][0] == '/')
2788 			return (unshare_unmount_path(op, argv[0],
2789 			    flags, B_FALSE));
2790 
2791 		types = ZFS_TYPE_FILESYSTEM;
2792 		if (op == OP_SHARE)
2793 			types |= ZFS_TYPE_VOLUME;
2794 
2795 		if ((zhp = zfs_open(g_zfs, argv[0], types)) == NULL)
2796 			return (1);
2797 
2798 		if (zfs_get_type(zhp) == ZFS_TYPE_FILESYSTEM) {
2799 			verify(zfs_prop_get(zhp, op == OP_SHARE ?
2800 			    ZFS_PROP_SHARENFS : ZFS_PROP_MOUNTPOINT, property,
2801 			    sizeof (property), NULL, NULL, 0, B_FALSE) == 0);
2802 
2803 			switch (op) {
2804 			case OP_SHARE:
2805 				if (strcmp(property, "off") == 0) {
2806 					(void) fprintf(stderr, gettext("cannot "
2807 					    "unshare '%s': legacy share\n"),
2808 					    zfs_get_name(zhp));
2809 					(void) fprintf(stderr, gettext("use "
2810 					    "unshare(1M) to unshare this "
2811 					    "filesystem\n"));
2812 					ret = 1;
2813 				} else if (!zfs_is_shared_nfs(zhp, NULL)) {
2814 					(void) fprintf(stderr, gettext("cannot "
2815 					    "unshare '%s': not currently "
2816 					    "shared\n"), zfs_get_name(zhp));
2817 					ret = 1;
2818 				} else if (zfs_unshareall_nfs(zhp) != 0) {
2819 					ret = 1;
2820 				}
2821 				break;
2822 
2823 			case OP_MOUNT:
2824 				if (strcmp(property, "legacy") == 0) {
2825 					(void) fprintf(stderr, gettext("cannot "
2826 					    "unmount '%s': legacy "
2827 					    "mountpoint\n"), zfs_get_name(zhp));
2828 					(void) fprintf(stderr, gettext("use "
2829 					    "umount(1M) to unmount this "
2830 					    "filesystem\n"));
2831 					ret = 1;
2832 				} else if (!zfs_is_mounted(zhp, NULL)) {
2833 					(void) fprintf(stderr, gettext("cannot "
2834 					    "unmount '%s': not currently "
2835 					    "mounted\n"),
2836 					    zfs_get_name(zhp));
2837 					ret = 1;
2838 				} else if (zfs_unmountall(zhp, flags) != 0) {
2839 					ret = 1;
2840 				}
2841 				break;
2842 			}
2843 		} else {
2844 			assert(op == OP_SHARE);
2845 
2846 			verify(zfs_prop_get(zhp, ZFS_PROP_SHAREISCSI, property,
2847 			    sizeof (property), NULL, NULL, 0, B_FALSE) == 0);
2848 
2849 			if (strcmp(property, "off") == 0) {
2850 				(void) fprintf(stderr, gettext("cannot unshare "
2851 				    "'%s': 'shareiscsi' property not set\n"),
2852 				    zfs_get_name(zhp));
2853 				(void) fprintf(stderr, gettext("set "
2854 				    "'shareiscsi' property or use "
2855 				    "iscsitadm(1M) to share this volume\n"));
2856 				ret = 1;
2857 			} else if (!zfs_is_shared_iscsi(zhp)) {
2858 				(void) fprintf(stderr, gettext("cannot "
2859 				    "unshare '%s': not currently shared\n"),
2860 				    zfs_get_name(zhp));
2861 				ret = 1;
2862 			} else if (zfs_unshare_iscsi(zhp) != 0) {
2863 				ret = 1;
2864 			}
2865 		}
2866 
2867 		zfs_close(zhp);
2868 	}
2869 
2870 	return (ret);
2871 }
2872 
2873 /*
2874  * zfs unmount -a
2875  * zfs unmount filesystem
2876  *
2877  * Unmount all filesystems, or a specific ZFS filesystem.
2878  */
2879 static int
2880 zfs_do_unmount(int argc, char **argv)
2881 {
2882 	return (unshare_unmount(OP_MOUNT, argc, argv));
2883 }
2884 
2885 /*
2886  * zfs unshare -a
2887  * zfs unshare filesystem
2888  *
2889  * Unshare all filesystems, or a specific ZFS filesystem.
2890  */
2891 static int
2892 zfs_do_unshare(int argc, char **argv)
2893 {
2894 	return (unshare_unmount(OP_SHARE, argc, argv));
2895 }
2896 
2897 /*
2898  * Called when invoked as /etc/fs/zfs/mount.  Do the mount if the mountpoint is
2899  * 'legacy'.  Otherwise, complain that use should be using 'zfs mount'.
2900  */
2901 static int
2902 manual_mount(int argc, char **argv)
2903 {
2904 	zfs_handle_t *zhp;
2905 	char mountpoint[ZFS_MAXPROPLEN];
2906 	char mntopts[MNT_LINE_MAX] = { '\0' };
2907 	int ret;
2908 	int c;
2909 	int flags = 0;
2910 	char *dataset, *path;
2911 
2912 	/* check options */
2913 	while ((c = getopt(argc, argv, ":mo:O")) != -1) {
2914 		switch (c) {
2915 		case 'o':
2916 			(void) strlcpy(mntopts, optarg, sizeof (mntopts));
2917 			break;
2918 		case 'O':
2919 			flags |= MS_OVERLAY;
2920 			break;
2921 		case 'm':
2922 			flags |= MS_NOMNTTAB;
2923 			break;
2924 		case ':':
2925 			(void) fprintf(stderr, gettext("missing argument for "
2926 			    "'%c' option\n"), optopt);
2927 			usage(B_FALSE);
2928 			break;
2929 		case '?':
2930 			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
2931 			    optopt);
2932 			(void) fprintf(stderr, gettext("usage: mount [-o opts] "
2933 			    "<path>\n"));
2934 			return (2);
2935 		}
2936 	}
2937 
2938 	argc -= optind;
2939 	argv += optind;
2940 
2941 	/* check that we only have two arguments */
2942 	if (argc != 2) {
2943 		if (argc == 0)
2944 			(void) fprintf(stderr, gettext("missing dataset "
2945 			    "argument\n"));
2946 		else if (argc == 1)
2947 			(void) fprintf(stderr,
2948 			    gettext("missing mountpoint argument\n"));
2949 		else
2950 			(void) fprintf(stderr, gettext("too many arguments\n"));
2951 		(void) fprintf(stderr, "usage: mount <dataset> <mountpoint>\n");
2952 		return (2);
2953 	}
2954 
2955 	dataset = argv[0];
2956 	path = argv[1];
2957 
2958 	/* try to open the dataset */
2959 	if ((zhp = zfs_open(g_zfs, dataset, ZFS_TYPE_FILESYSTEM)) == NULL)
2960 		return (1);
2961 
2962 	(void) zfs_prop_get(zhp, ZFS_PROP_MOUNTPOINT, mountpoint,
2963 	    sizeof (mountpoint), NULL, NULL, 0, B_FALSE);
2964 
2965 	/* check for legacy mountpoint and complain appropriately */
2966 	ret = 0;
2967 	if (strcmp(mountpoint, ZFS_MOUNTPOINT_LEGACY) == 0) {
2968 		if (mount(dataset, path, MS_OPTIONSTR | flags, MNTTYPE_ZFS,
2969 		    NULL, 0, mntopts, sizeof (mntopts)) != 0) {
2970 			(void) fprintf(stderr, gettext("mount failed: %s\n"),
2971 			    strerror(errno));
2972 			ret = 1;
2973 		}
2974 	} else {
2975 		(void) fprintf(stderr, gettext("filesystem '%s' cannot be "
2976 		    "mounted using 'mount -F zfs'\n"), dataset);
2977 		(void) fprintf(stderr, gettext("Use 'zfs set mountpoint=%s' "
2978 		    "instead.\n"), path);
2979 		(void) fprintf(stderr, gettext("If you must use 'mount -F zfs' "
2980 		    "or /etc/vfstab, use 'zfs set mountpoint=legacy'.\n"));
2981 		(void) fprintf(stderr, gettext("See zfs(1M) for more "
2982 		    "information.\n"));
2983 		ret = 1;
2984 	}
2985 
2986 	return (ret);
2987 }
2988 
2989 /*
2990  * Called when invoked as /etc/fs/zfs/umount.  Unlike a manual mount, we allow
2991  * unmounts of non-legacy filesystems, as this is the dominant administrative
2992  * interface.
2993  */
2994 static int
2995 manual_unmount(int argc, char **argv)
2996 {
2997 	int flags = 0;
2998 	int c;
2999 
3000 	/* check options */
3001 	while ((c = getopt(argc, argv, "f")) != -1) {
3002 		switch (c) {
3003 		case 'f':
3004 			flags = MS_FORCE;
3005 			break;
3006 		case '?':
3007 			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
3008 			    optopt);
3009 			(void) fprintf(stderr, gettext("usage: unmount [-f] "
3010 			    "<path>\n"));
3011 			return (2);
3012 		}
3013 	}
3014 
3015 	argc -= optind;
3016 	argv += optind;
3017 
3018 	/* check arguments */
3019 	if (argc != 1) {
3020 		if (argc == 0)
3021 			(void) fprintf(stderr, gettext("missing path "
3022 			    "argument\n"));
3023 		else
3024 			(void) fprintf(stderr, gettext("too many arguments\n"));
3025 		(void) fprintf(stderr, gettext("usage: unmount [-f] <path>\n"));
3026 		return (2);
3027 	}
3028 
3029 	return (unshare_unmount_path(OP_MOUNT, argv[0], flags, B_TRUE));
3030 }
3031 
3032 static int
3033 volcheck(zpool_handle_t *zhp, void *data)
3034 {
3035 	boolean_t isinit = *((boolean_t *)data);
3036 
3037 	if (isinit)
3038 		return (zpool_create_zvol_links(zhp));
3039 	else
3040 		return (zpool_remove_zvol_links(zhp));
3041 }
3042 
3043 /*
3044  * Iterate over all pools in the system and either create or destroy /dev/zvol
3045  * links, depending on the value of 'isinit'.
3046  */
3047 static int
3048 do_volcheck(boolean_t isinit)
3049 {
3050 	return (zpool_iter(g_zfs, volcheck, &isinit) ? 1 : 0);
3051 }
3052 
3053 int
3054 main(int argc, char **argv)
3055 {
3056 	int ret;
3057 	int i;
3058 	char *progname;
3059 	char *cmdname;
3060 
3061 	(void) setlocale(LC_ALL, "");
3062 	(void) textdomain(TEXT_DOMAIN);
3063 
3064 	opterr = 0;
3065 
3066 	if ((g_zfs = libzfs_init()) == NULL) {
3067 		(void) fprintf(stderr, gettext("internal error: failed to "
3068 		    "initialize ZFS library\n"));
3069 		return (1);
3070 	}
3071 
3072 	libzfs_print_on_error(g_zfs, B_TRUE);
3073 
3074 	if ((mnttab_file = fopen(MNTTAB, "r")) == NULL) {
3075 		(void) fprintf(stderr, gettext("internal error: unable to "
3076 		    "open %s\n"), MNTTAB);
3077 		return (1);
3078 	}
3079 
3080 	/*
3081 	 * This command also doubles as the /etc/fs mount and unmount program.
3082 	 * Determine if we should take this behavior based on argv[0].
3083 	 */
3084 	progname = basename(argv[0]);
3085 	if (strcmp(progname, "mount") == 0) {
3086 		ret = manual_mount(argc, argv);
3087 	} else if (strcmp(progname, "umount") == 0) {
3088 		ret = manual_unmount(argc, argv);
3089 	} else {
3090 		/*
3091 		 * Make sure the user has specified some command.
3092 		 */
3093 		if (argc < 2) {
3094 			(void) fprintf(stderr, gettext("missing command\n"));
3095 			usage(B_FALSE);
3096 		}
3097 
3098 		cmdname = argv[1];
3099 
3100 		/*
3101 		 * The 'umount' command is an alias for 'unmount'
3102 		 */
3103 		if (strcmp(cmdname, "umount") == 0)
3104 			cmdname = "unmount";
3105 
3106 		/*
3107 		 * The 'recv' command is an alias for 'receive'
3108 		 */
3109 		if (strcmp(cmdname, "recv") == 0)
3110 			cmdname = "receive";
3111 
3112 		/*
3113 		 * Special case '-?'
3114 		 */
3115 		if (strcmp(cmdname, "-?") == 0)
3116 			usage(B_TRUE);
3117 
3118 		/*
3119 		 * 'volinit' and 'volfini' do not appear in the usage message,
3120 		 * so we have to special case them here.
3121 		 */
3122 		if (strcmp(cmdname, "volinit") == 0)
3123 			return (do_volcheck(B_TRUE));
3124 		else if (strcmp(cmdname, "volfini") == 0)
3125 			return (do_volcheck(B_FALSE));
3126 
3127 		/*
3128 		 * Run the appropriate command.
3129 		 */
3130 		for (i = 0; i < NCOMMAND; i++) {
3131 			if (command_table[i].name == NULL)
3132 				continue;
3133 
3134 			if (strcmp(cmdname, command_table[i].name) == 0) {
3135 				current_command = &command_table[i];
3136 				ret = command_table[i].func(argc - 1, argv + 1);
3137 				break;
3138 			}
3139 		}
3140 
3141 		if (i == NCOMMAND) {
3142 			(void) fprintf(stderr, gettext("unrecognized "
3143 			    "command '%s'\n"), cmdname);
3144 			usage(B_FALSE);
3145 		}
3146 	}
3147 
3148 	(void) fclose(mnttab_file);
3149 
3150 	libzfs_fini(g_zfs);
3151 
3152 	/*
3153 	 * The 'ZFS_ABORT' environment variable causes us to dump core on exit
3154 	 * for the purposes of running ::findleaks.
3155 	 */
3156 	if (getenv("ZFS_ABORT") != NULL) {
3157 		(void) printf("dumping core by request\n");
3158 		abort();
3159 	}
3160 
3161 	return (ret);
3162 }
3163