xref: /illumos-gate/usr/src/cmd/zfs/zfs_main.c (revision 5a7aa9af90e4fc305e96f3592d2f1e5809ec5680)
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 (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
24  * Copyright 2012 Nexenta Systems, Inc. All rights reserved.
25  * Copyright (c) 2012 by Delphix. All rights reserved.
26  * Copyright 2012 Milan Jurik. All rights reserved.
27  * Copyright (c) 2012, Joyent, Inc. All rights reserved.
28  */
29 
30 #include <assert.h>
31 #include <ctype.h>
32 #include <errno.h>
33 #include <libgen.h>
34 #include <libintl.h>
35 #include <libuutil.h>
36 #include <libnvpair.h>
37 #include <locale.h>
38 #include <stddef.h>
39 #include <stdio.h>
40 #include <stdlib.h>
41 #include <strings.h>
42 #include <unistd.h>
43 #include <fcntl.h>
44 #include <zone.h>
45 #include <grp.h>
46 #include <pwd.h>
47 #include <signal.h>
48 #include <sys/list.h>
49 #include <sys/mkdev.h>
50 #include <sys/mntent.h>
51 #include <sys/mnttab.h>
52 #include <sys/mount.h>
53 #include <sys/stat.h>
54 #include <sys/fs/zfs.h>
55 #include <sys/types.h>
56 #include <time.h>
57 
58 #include <libzfs.h>
59 #include <libzfs_core.h>
60 #include <zfs_prop.h>
61 #include <zfs_deleg.h>
62 #include <libuutil.h>
63 #include <aclutils.h>
64 #include <directory.h>
65 
66 #include "zfs_iter.h"
67 #include "zfs_util.h"
68 #include "zfs_comutil.h"
69 
70 libzfs_handle_t *g_zfs;
71 
72 static FILE *mnttab_file;
73 static char history_str[HIS_MAX_RECORD_LEN];
74 static boolean_t log_history = B_TRUE;
75 
76 static int zfs_do_clone(int argc, char **argv);
77 static int zfs_do_create(int argc, char **argv);
78 static int zfs_do_destroy(int argc, char **argv);
79 static int zfs_do_get(int argc, char **argv);
80 static int zfs_do_inherit(int argc, char **argv);
81 static int zfs_do_list(int argc, char **argv);
82 static int zfs_do_mount(int argc, char **argv);
83 static int zfs_do_rename(int argc, char **argv);
84 static int zfs_do_rollback(int argc, char **argv);
85 static int zfs_do_set(int argc, char **argv);
86 static int zfs_do_upgrade(int argc, char **argv);
87 static int zfs_do_snapshot(int argc, char **argv);
88 static int zfs_do_unmount(int argc, char **argv);
89 static int zfs_do_share(int argc, char **argv);
90 static int zfs_do_unshare(int argc, char **argv);
91 static int zfs_do_send(int argc, char **argv);
92 static int zfs_do_receive(int argc, char **argv);
93 static int zfs_do_promote(int argc, char **argv);
94 static int zfs_do_userspace(int argc, char **argv);
95 static int zfs_do_allow(int argc, char **argv);
96 static int zfs_do_unallow(int argc, char **argv);
97 static int zfs_do_hold(int argc, char **argv);
98 static int zfs_do_holds(int argc, char **argv);
99 static int zfs_do_release(int argc, char **argv);
100 static int zfs_do_diff(int argc, char **argv);
101 
102 /*
103  * Enable a reasonable set of defaults for libumem debugging on DEBUG builds.
104  */
105 
106 #ifdef DEBUG
107 const char *
108 _umem_debug_init(void)
109 {
110 	return ("default,verbose"); /* $UMEM_DEBUG setting */
111 }
112 
113 const char *
114 _umem_logging_init(void)
115 {
116 	return ("fail,contents"); /* $UMEM_LOGGING setting */
117 }
118 #endif
119 
120 typedef enum {
121 	HELP_CLONE,
122 	HELP_CREATE,
123 	HELP_DESTROY,
124 	HELP_GET,
125 	HELP_INHERIT,
126 	HELP_UPGRADE,
127 	HELP_LIST,
128 	HELP_MOUNT,
129 	HELP_PROMOTE,
130 	HELP_RECEIVE,
131 	HELP_RENAME,
132 	HELP_ROLLBACK,
133 	HELP_SEND,
134 	HELP_SET,
135 	HELP_SHARE,
136 	HELP_SNAPSHOT,
137 	HELP_UNMOUNT,
138 	HELP_UNSHARE,
139 	HELP_ALLOW,
140 	HELP_UNALLOW,
141 	HELP_USERSPACE,
142 	HELP_GROUPSPACE,
143 	HELP_HOLD,
144 	HELP_HOLDS,
145 	HELP_RELEASE,
146 	HELP_DIFF,
147 } zfs_help_t;
148 
149 typedef struct zfs_command {
150 	const char	*name;
151 	int		(*func)(int argc, char **argv);
152 	zfs_help_t	usage;
153 } zfs_command_t;
154 
155 /*
156  * Master command table.  Each ZFS command has a name, associated function, and
157  * usage message.  The usage messages need to be internationalized, so we have
158  * to have a function to return the usage message based on a command index.
159  *
160  * These commands are organized according to how they are displayed in the usage
161  * message.  An empty command (one with a NULL name) indicates an empty line in
162  * the generic usage message.
163  */
164 static zfs_command_t command_table[] = {
165 	{ "create",	zfs_do_create,		HELP_CREATE		},
166 	{ "destroy",	zfs_do_destroy,		HELP_DESTROY		},
167 	{ NULL },
168 	{ "snapshot",	zfs_do_snapshot,	HELP_SNAPSHOT		},
169 	{ "rollback",	zfs_do_rollback,	HELP_ROLLBACK		},
170 	{ "clone",	zfs_do_clone,		HELP_CLONE		},
171 	{ "promote",	zfs_do_promote,		HELP_PROMOTE		},
172 	{ "rename",	zfs_do_rename,		HELP_RENAME		},
173 	{ NULL },
174 	{ "list",	zfs_do_list,		HELP_LIST		},
175 	{ NULL },
176 	{ "set",	zfs_do_set,		HELP_SET		},
177 	{ "get",	zfs_do_get,		HELP_GET		},
178 	{ "inherit",	zfs_do_inherit,		HELP_INHERIT		},
179 	{ "upgrade",	zfs_do_upgrade,		HELP_UPGRADE		},
180 	{ "userspace",	zfs_do_userspace,	HELP_USERSPACE		},
181 	{ "groupspace",	zfs_do_userspace,	HELP_GROUPSPACE		},
182 	{ NULL },
183 	{ "mount",	zfs_do_mount,		HELP_MOUNT		},
184 	{ "unmount",	zfs_do_unmount,		HELP_UNMOUNT		},
185 	{ "share",	zfs_do_share,		HELP_SHARE		},
186 	{ "unshare",	zfs_do_unshare,		HELP_UNSHARE		},
187 	{ NULL },
188 	{ "send",	zfs_do_send,		HELP_SEND		},
189 	{ "receive",	zfs_do_receive,		HELP_RECEIVE		},
190 	{ NULL },
191 	{ "allow",	zfs_do_allow,		HELP_ALLOW		},
192 	{ NULL },
193 	{ "unallow",	zfs_do_unallow,		HELP_UNALLOW		},
194 	{ NULL },
195 	{ "hold",	zfs_do_hold,		HELP_HOLD		},
196 	{ "holds",	zfs_do_holds,		HELP_HOLDS		},
197 	{ "release",	zfs_do_release,		HELP_RELEASE		},
198 	{ "diff",	zfs_do_diff,		HELP_DIFF		},
199 };
200 
201 #define	NCOMMAND	(sizeof (command_table) / sizeof (command_table[0]))
202 
203 zfs_command_t *current_command;
204 
205 static const char *
206 get_usage(zfs_help_t idx)
207 {
208 	switch (idx) {
209 	case HELP_CLONE:
210 		return (gettext("\tclone [-p] [-o property=value] ... "
211 		    "<snapshot> <filesystem|volume>\n"));
212 	case HELP_CREATE:
213 		return (gettext("\tcreate [-p] [-o property=value] ... "
214 		    "<filesystem>\n"
215 		    "\tcreate [-ps] [-b blocksize] [-o property=value] ... "
216 		    "-V <size> <volume>\n"));
217 	case HELP_DESTROY:
218 		return (gettext("\tdestroy [-fnpRrv] <filesystem|volume>\n"
219 		    "\tdestroy [-dnpRrv] "
220 		    "<filesystem|volume>@<snap>[%<snap>][,...]\n"));
221 	case HELP_GET:
222 		return (gettext("\tget [-rHp] [-d max] "
223 		    "[-o \"all\" | field[,...]] [-t type[,...]] "
224 		    "[-s source[,...]]\n"
225 		    "\t    <\"all\" | property[,...]> "
226 		    "[filesystem|volume|snapshot] ...\n"));
227 	case HELP_INHERIT:
228 		return (gettext("\tinherit [-rS] <property> "
229 		    "<filesystem|volume|snapshot> ...\n"));
230 	case HELP_UPGRADE:
231 		return (gettext("\tupgrade [-v]\n"
232 		    "\tupgrade [-r] [-V version] <-a | filesystem ...>\n"));
233 	case HELP_LIST:
234 		return (gettext("\tlist [-rH][-d max] "
235 		    "[-o property[,...]] [-t type[,...]] [-s property] ...\n"
236 		    "\t    [-S property] ... "
237 		    "[filesystem|volume|snapshot] ...\n"));
238 	case HELP_MOUNT:
239 		return (gettext("\tmount\n"
240 		    "\tmount [-vO] [-o opts] <-a | filesystem>\n"));
241 	case HELP_PROMOTE:
242 		return (gettext("\tpromote <clone-filesystem>\n"));
243 	case HELP_RECEIVE:
244 		return (gettext("\treceive [-vnFu] <filesystem|volume|"
245 		"snapshot>\n"
246 		"\treceive [-vnFu] [-d | -e] <filesystem>\n"));
247 	case HELP_RENAME:
248 		return (gettext("\trename [-f] <filesystem|volume|snapshot> "
249 		    "<filesystem|volume|snapshot>\n"
250 		    "\trename [-f] -p <filesystem|volume> <filesystem|volume>\n"
251 		    "\trename -r <snapshot> <snapshot>"));
252 	case HELP_ROLLBACK:
253 		return (gettext("\trollback [-rRf] <snapshot>\n"));
254 	case HELP_SEND:
255 		return (gettext("\tsend [-DnPpRv] [-[iI] snapshot] "
256 		    "<snapshot>\n"));
257 	case HELP_SET:
258 		return (gettext("\tset <property=value> "
259 		    "<filesystem|volume|snapshot> ...\n"));
260 	case HELP_SHARE:
261 		return (gettext("\tshare <-a | filesystem>\n"));
262 	case HELP_SNAPSHOT:
263 		return (gettext("\tsnapshot [-r] [-o property=value] ... "
264 		    "<filesystem@snapname|volume@snapname> ...\n"));
265 	case HELP_UNMOUNT:
266 		return (gettext("\tunmount [-f] "
267 		    "<-a | filesystem|mountpoint>\n"));
268 	case HELP_UNSHARE:
269 		return (gettext("\tunshare "
270 		    "<-a | filesystem|mountpoint>\n"));
271 	case HELP_ALLOW:
272 		return (gettext("\tallow <filesystem|volume>\n"
273 		    "\tallow [-ldug] "
274 		    "<\"everyone\"|user|group>[,...] <perm|@setname>[,...]\n"
275 		    "\t    <filesystem|volume>\n"
276 		    "\tallow [-ld] -e <perm|@setname>[,...] "
277 		    "<filesystem|volume>\n"
278 		    "\tallow -c <perm|@setname>[,...] <filesystem|volume>\n"
279 		    "\tallow -s @setname <perm|@setname>[,...] "
280 		    "<filesystem|volume>\n"));
281 	case HELP_UNALLOW:
282 		return (gettext("\tunallow [-rldug] "
283 		    "<\"everyone\"|user|group>[,...]\n"
284 		    "\t    [<perm|@setname>[,...]] <filesystem|volume>\n"
285 		    "\tunallow [-rld] -e [<perm|@setname>[,...]] "
286 		    "<filesystem|volume>\n"
287 		    "\tunallow [-r] -c [<perm|@setname>[,...]] "
288 		    "<filesystem|volume>\n"
289 		    "\tunallow [-r] -s @setname [<perm|@setname>[,...]] "
290 		    "<filesystem|volume>\n"));
291 	case HELP_USERSPACE:
292 		return (gettext("\tuserspace [-Hinp] [-o field[,...]] "
293 		    "[-s field] ...\n\t[-S field] ... "
294 		    "[-t type[,...]] <filesystem|snapshot>\n"));
295 	case HELP_GROUPSPACE:
296 		return (gettext("\tgroupspace [-Hinp] [-o field[,...]] "
297 		    "[-s field] ...\n\t[-S field] ... "
298 		    "[-t type[,...]] <filesystem|snapshot>\n"));
299 	case HELP_HOLD:
300 		return (gettext("\thold [-r] <tag> <snapshot> ...\n"));
301 	case HELP_HOLDS:
302 		return (gettext("\tholds [-r] <snapshot> ...\n"));
303 	case HELP_RELEASE:
304 		return (gettext("\trelease [-r] <tag> <snapshot> ...\n"));
305 	case HELP_DIFF:
306 		return (gettext("\tdiff [-FHt] <snapshot> "
307 		    "[snapshot|filesystem]\n"));
308 	}
309 
310 	abort();
311 	/* NOTREACHED */
312 }
313 
314 void
315 nomem(void)
316 {
317 	(void) fprintf(stderr, gettext("internal error: out of memory\n"));
318 	exit(1);
319 }
320 
321 /*
322  * Utility function to guarantee malloc() success.
323  */
324 
325 void *
326 safe_malloc(size_t size)
327 {
328 	void *data;
329 
330 	if ((data = calloc(1, size)) == NULL)
331 		nomem();
332 
333 	return (data);
334 }
335 
336 static char *
337 safe_strdup(char *str)
338 {
339 	char *dupstr = strdup(str);
340 
341 	if (dupstr == NULL)
342 		nomem();
343 
344 	return (dupstr);
345 }
346 
347 /*
348  * Callback routine that will print out information for each of
349  * the properties.
350  */
351 static int
352 usage_prop_cb(int prop, void *cb)
353 {
354 	FILE *fp = cb;
355 
356 	(void) fprintf(fp, "\t%-15s ", zfs_prop_to_name(prop));
357 
358 	if (zfs_prop_readonly(prop))
359 		(void) fprintf(fp, " NO    ");
360 	else
361 		(void) fprintf(fp, "YES    ");
362 
363 	if (zfs_prop_inheritable(prop))
364 		(void) fprintf(fp, "  YES   ");
365 	else
366 		(void) fprintf(fp, "   NO   ");
367 
368 	if (zfs_prop_values(prop) == NULL)
369 		(void) fprintf(fp, "-\n");
370 	else
371 		(void) fprintf(fp, "%s\n", zfs_prop_values(prop));
372 
373 	return (ZPROP_CONT);
374 }
375 
376 /*
377  * Display usage message.  If we're inside a command, display only the usage for
378  * that command.  Otherwise, iterate over the entire command table and display
379  * a complete usage message.
380  */
381 static void
382 usage(boolean_t requested)
383 {
384 	int i;
385 	boolean_t show_properties = B_FALSE;
386 	FILE *fp = requested ? stdout : stderr;
387 
388 	if (current_command == NULL) {
389 
390 		(void) fprintf(fp, gettext("usage: zfs command args ...\n"));
391 		(void) fprintf(fp,
392 		    gettext("where 'command' is one of the following:\n\n"));
393 
394 		for (i = 0; i < NCOMMAND; i++) {
395 			if (command_table[i].name == NULL)
396 				(void) fprintf(fp, "\n");
397 			else
398 				(void) fprintf(fp, "%s",
399 				    get_usage(command_table[i].usage));
400 		}
401 
402 		(void) fprintf(fp, gettext("\nEach dataset is of the form: "
403 		    "pool/[dataset/]*dataset[@name]\n"));
404 	} else {
405 		(void) fprintf(fp, gettext("usage:\n"));
406 		(void) fprintf(fp, "%s", get_usage(current_command->usage));
407 	}
408 
409 	if (current_command != NULL &&
410 	    (strcmp(current_command->name, "set") == 0 ||
411 	    strcmp(current_command->name, "get") == 0 ||
412 	    strcmp(current_command->name, "inherit") == 0 ||
413 	    strcmp(current_command->name, "list") == 0))
414 		show_properties = B_TRUE;
415 
416 	if (show_properties) {
417 		(void) fprintf(fp,
418 		    gettext("\nThe following properties are supported:\n"));
419 
420 		(void) fprintf(fp, "\n\t%-14s %s  %s   %s\n\n",
421 		    "PROPERTY", "EDIT", "INHERIT", "VALUES");
422 
423 		/* Iterate over all properties */
424 		(void) zprop_iter(usage_prop_cb, fp, B_FALSE, B_TRUE,
425 		    ZFS_TYPE_DATASET);
426 
427 		(void) fprintf(fp, "\t%-15s ", "userused@...");
428 		(void) fprintf(fp, " NO       NO   <size>\n");
429 		(void) fprintf(fp, "\t%-15s ", "groupused@...");
430 		(void) fprintf(fp, " NO       NO   <size>\n");
431 		(void) fprintf(fp, "\t%-15s ", "userquota@...");
432 		(void) fprintf(fp, "YES       NO   <size> | none\n");
433 		(void) fprintf(fp, "\t%-15s ", "groupquota@...");
434 		(void) fprintf(fp, "YES       NO   <size> | none\n");
435 		(void) fprintf(fp, "\t%-15s ", "written@<snap>");
436 		(void) fprintf(fp, " NO       NO   <size>\n");
437 
438 		(void) fprintf(fp, gettext("\nSizes are specified in bytes "
439 		    "with standard units such as K, M, G, etc.\n"));
440 		(void) fprintf(fp, gettext("\nUser-defined properties can "
441 		    "be specified by using a name containing a colon (:).\n"));
442 		(void) fprintf(fp, gettext("\nThe {user|group}{used|quota}@ "
443 		    "properties must be appended with\n"
444 		    "a user or group specifier of one of these forms:\n"
445 		    "    POSIX name      (eg: \"matt\")\n"
446 		    "    POSIX id        (eg: \"126829\")\n"
447 		    "    SMB name@domain (eg: \"matt@sun\")\n"
448 		    "    SMB SID         (eg: \"S-1-234-567-89\")\n"));
449 	} else {
450 		(void) fprintf(fp,
451 		    gettext("\nFor the property list, run: %s\n"),
452 		    "zfs set|get");
453 		(void) fprintf(fp,
454 		    gettext("\nFor the delegated permission list, run: %s\n"),
455 		    "zfs allow|unallow");
456 	}
457 
458 	/*
459 	 * See comments at end of main().
460 	 */
461 	if (getenv("ZFS_ABORT") != NULL) {
462 		(void) printf("dumping core by request\n");
463 		abort();
464 	}
465 
466 	exit(requested ? 0 : 2);
467 }
468 
469 static int
470 parseprop(nvlist_t *props)
471 {
472 	char *propname = optarg;
473 	char *propval, *strval;
474 
475 	if ((propval = strchr(propname, '=')) == NULL) {
476 		(void) fprintf(stderr, gettext("missing "
477 		    "'=' for -o option\n"));
478 		return (-1);
479 	}
480 	*propval = '\0';
481 	propval++;
482 	if (nvlist_lookup_string(props, propname, &strval) == 0) {
483 		(void) fprintf(stderr, gettext("property '%s' "
484 		    "specified multiple times\n"), propname);
485 		return (-1);
486 	}
487 	if (nvlist_add_string(props, propname, propval) != 0)
488 		nomem();
489 	return (0);
490 }
491 
492 static int
493 parse_depth(char *opt, int *flags)
494 {
495 	char *tmp;
496 	int depth;
497 
498 	depth = (int)strtol(opt, &tmp, 0);
499 	if (*tmp) {
500 		(void) fprintf(stderr,
501 		    gettext("%s is not an integer\n"), optarg);
502 		usage(B_FALSE);
503 	}
504 	if (depth < 0) {
505 		(void) fprintf(stderr,
506 		    gettext("Depth can not be negative.\n"));
507 		usage(B_FALSE);
508 	}
509 	*flags |= (ZFS_ITER_DEPTH_LIMIT|ZFS_ITER_RECURSE);
510 	return (depth);
511 }
512 
513 #define	PROGRESS_DELAY 2		/* seconds */
514 
515 static char *pt_reverse = "\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b";
516 static time_t pt_begin;
517 static char *pt_header = NULL;
518 static boolean_t pt_shown;
519 
520 static void
521 start_progress_timer(void)
522 {
523 	pt_begin = time(NULL) + PROGRESS_DELAY;
524 	pt_shown = B_FALSE;
525 }
526 
527 static void
528 set_progress_header(char *header)
529 {
530 	assert(pt_header == NULL);
531 	pt_header = safe_strdup(header);
532 	if (pt_shown) {
533 		(void) printf("%s: ", header);
534 		(void) fflush(stdout);
535 	}
536 }
537 
538 static void
539 update_progress(char *update)
540 {
541 	if (!pt_shown && time(NULL) > pt_begin) {
542 		int len = strlen(update);
543 
544 		(void) printf("%s: %s%*.*s", pt_header, update, len, len,
545 		    pt_reverse);
546 		(void) fflush(stdout);
547 		pt_shown = B_TRUE;
548 	} else if (pt_shown) {
549 		int len = strlen(update);
550 
551 		(void) printf("%s%*.*s", update, len, len, pt_reverse);
552 		(void) fflush(stdout);
553 	}
554 }
555 
556 static void
557 finish_progress(char *done)
558 {
559 	if (pt_shown) {
560 		(void) printf("%s\n", done);
561 		(void) fflush(stdout);
562 	}
563 	free(pt_header);
564 	pt_header = NULL;
565 }
566 /*
567  * zfs clone [-p] [-o prop=value] ... <snap> <fs | vol>
568  *
569  * Given an existing dataset, create a writable copy whose initial contents
570  * are the same as the source.  The newly created dataset maintains a
571  * dependency on the original; the original cannot be destroyed so long as
572  * the clone exists.
573  *
574  * The '-p' flag creates all the non-existing ancestors of the target first.
575  */
576 static int
577 zfs_do_clone(int argc, char **argv)
578 {
579 	zfs_handle_t *zhp = NULL;
580 	boolean_t parents = B_FALSE;
581 	nvlist_t *props;
582 	int ret = 0;
583 	int c;
584 
585 	if (nvlist_alloc(&props, NV_UNIQUE_NAME, 0) != 0)
586 		nomem();
587 
588 	/* check options */
589 	while ((c = getopt(argc, argv, "o:p")) != -1) {
590 		switch (c) {
591 		case 'o':
592 			if (parseprop(props))
593 				return (1);
594 			break;
595 		case 'p':
596 			parents = B_TRUE;
597 			break;
598 		case '?':
599 			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
600 			    optopt);
601 			goto usage;
602 		}
603 	}
604 
605 	argc -= optind;
606 	argv += optind;
607 
608 	/* check number of arguments */
609 	if (argc < 1) {
610 		(void) fprintf(stderr, gettext("missing source dataset "
611 		    "argument\n"));
612 		goto usage;
613 	}
614 	if (argc < 2) {
615 		(void) fprintf(stderr, gettext("missing target dataset "
616 		    "argument\n"));
617 		goto usage;
618 	}
619 	if (argc > 2) {
620 		(void) fprintf(stderr, gettext("too many arguments\n"));
621 		goto usage;
622 	}
623 
624 	/* open the source dataset */
625 	if ((zhp = zfs_open(g_zfs, argv[0], ZFS_TYPE_SNAPSHOT)) == NULL)
626 		return (1);
627 
628 	if (parents && zfs_name_valid(argv[1], ZFS_TYPE_FILESYSTEM |
629 	    ZFS_TYPE_VOLUME)) {
630 		/*
631 		 * Now create the ancestors of the target dataset.  If the
632 		 * target already exists and '-p' option was used we should not
633 		 * complain.
634 		 */
635 		if (zfs_dataset_exists(g_zfs, argv[1], ZFS_TYPE_FILESYSTEM |
636 		    ZFS_TYPE_VOLUME))
637 			return (0);
638 		if (zfs_create_ancestors(g_zfs, argv[1]) != 0)
639 			return (1);
640 	}
641 
642 	/* pass to libzfs */
643 	ret = zfs_clone(zhp, argv[1], props);
644 
645 	/* create the mountpoint if necessary */
646 	if (ret == 0) {
647 		zfs_handle_t *clone;
648 
649 		clone = zfs_open(g_zfs, argv[1], ZFS_TYPE_DATASET);
650 		if (clone != NULL) {
651 			if (zfs_get_type(clone) != ZFS_TYPE_VOLUME)
652 				if ((ret = zfs_mount(clone, NULL, 0)) == 0)
653 					ret = zfs_share(clone);
654 			zfs_close(clone);
655 		}
656 	}
657 
658 	zfs_close(zhp);
659 	nvlist_free(props);
660 
661 	return (!!ret);
662 
663 usage:
664 	if (zhp)
665 		zfs_close(zhp);
666 	nvlist_free(props);
667 	usage(B_FALSE);
668 	return (-1);
669 }
670 
671 /*
672  * zfs create [-p] [-o prop=value] ... fs
673  * zfs create [-ps] [-b blocksize] [-o prop=value] ... -V vol size
674  *
675  * Create a new dataset.  This command can be used to create filesystems
676  * and volumes.  Snapshot creation is handled by 'zfs snapshot'.
677  * For volumes, the user must specify a size to be used.
678  *
679  * The '-s' flag applies only to volumes, and indicates that we should not try
680  * to set the reservation for this volume.  By default we set a reservation
681  * equal to the size for any volume.  For pools with SPA_VERSION >=
682  * SPA_VERSION_REFRESERVATION, we set a refreservation instead.
683  *
684  * The '-p' flag creates all the non-existing ancestors of the target first.
685  */
686 static int
687 zfs_do_create(int argc, char **argv)
688 {
689 	zfs_type_t type = ZFS_TYPE_FILESYSTEM;
690 	zfs_handle_t *zhp = NULL;
691 	uint64_t volsize;
692 	int c;
693 	boolean_t noreserve = B_FALSE;
694 	boolean_t bflag = B_FALSE;
695 	boolean_t parents = B_FALSE;
696 	int ret = 1;
697 	nvlist_t *props;
698 	uint64_t intval;
699 	int canmount = ZFS_CANMOUNT_OFF;
700 
701 	if (nvlist_alloc(&props, NV_UNIQUE_NAME, 0) != 0)
702 		nomem();
703 
704 	/* check options */
705 	while ((c = getopt(argc, argv, ":V:b:so:p")) != -1) {
706 		switch (c) {
707 		case 'V':
708 			type = ZFS_TYPE_VOLUME;
709 			if (zfs_nicestrtonum(g_zfs, optarg, &intval) != 0) {
710 				(void) fprintf(stderr, gettext("bad volume "
711 				    "size '%s': %s\n"), optarg,
712 				    libzfs_error_description(g_zfs));
713 				goto error;
714 			}
715 
716 			if (nvlist_add_uint64(props,
717 			    zfs_prop_to_name(ZFS_PROP_VOLSIZE), intval) != 0)
718 				nomem();
719 			volsize = intval;
720 			break;
721 		case 'p':
722 			parents = B_TRUE;
723 			break;
724 		case 'b':
725 			bflag = B_TRUE;
726 			if (zfs_nicestrtonum(g_zfs, optarg, &intval) != 0) {
727 				(void) fprintf(stderr, gettext("bad volume "
728 				    "block size '%s': %s\n"), optarg,
729 				    libzfs_error_description(g_zfs));
730 				goto error;
731 			}
732 
733 			if (nvlist_add_uint64(props,
734 			    zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE),
735 			    intval) != 0)
736 				nomem();
737 			break;
738 		case 'o':
739 			if (parseprop(props))
740 				goto error;
741 			break;
742 		case 's':
743 			noreserve = B_TRUE;
744 			break;
745 		case ':':
746 			(void) fprintf(stderr, gettext("missing size "
747 			    "argument\n"));
748 			goto badusage;
749 		case '?':
750 			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
751 			    optopt);
752 			goto badusage;
753 		}
754 	}
755 
756 	if ((bflag || noreserve) && type != ZFS_TYPE_VOLUME) {
757 		(void) fprintf(stderr, gettext("'-s' and '-b' can only be "
758 		    "used when creating a volume\n"));
759 		goto badusage;
760 	}
761 
762 	argc -= optind;
763 	argv += optind;
764 
765 	/* check number of arguments */
766 	if (argc == 0) {
767 		(void) fprintf(stderr, gettext("missing %s argument\n"),
768 		    zfs_type_to_name(type));
769 		goto badusage;
770 	}
771 	if (argc > 1) {
772 		(void) fprintf(stderr, gettext("too many arguments\n"));
773 		goto badusage;
774 	}
775 
776 	if (type == ZFS_TYPE_VOLUME && !noreserve) {
777 		zpool_handle_t *zpool_handle;
778 		uint64_t spa_version;
779 		char *p;
780 		zfs_prop_t resv_prop;
781 		char *strval;
782 
783 		if (p = strchr(argv[0], '/'))
784 			*p = '\0';
785 		zpool_handle = zpool_open(g_zfs, argv[0]);
786 		if (p != NULL)
787 			*p = '/';
788 		if (zpool_handle == NULL)
789 			goto error;
790 		spa_version = zpool_get_prop_int(zpool_handle,
791 		    ZPOOL_PROP_VERSION, NULL);
792 		zpool_close(zpool_handle);
793 		if (spa_version >= SPA_VERSION_REFRESERVATION)
794 			resv_prop = ZFS_PROP_REFRESERVATION;
795 		else
796 			resv_prop = ZFS_PROP_RESERVATION;
797 		volsize = zvol_volsize_to_reservation(volsize, props);
798 
799 		if (nvlist_lookup_string(props, zfs_prop_to_name(resv_prop),
800 		    &strval) != 0) {
801 			if (nvlist_add_uint64(props,
802 			    zfs_prop_to_name(resv_prop), volsize) != 0) {
803 				nvlist_free(props);
804 				nomem();
805 			}
806 		}
807 	}
808 
809 	if (parents && zfs_name_valid(argv[0], type)) {
810 		/*
811 		 * Now create the ancestors of target dataset.  If the target
812 		 * already exists and '-p' option was used we should not
813 		 * complain.
814 		 */
815 		if (zfs_dataset_exists(g_zfs, argv[0], type)) {
816 			ret = 0;
817 			goto error;
818 		}
819 		if (zfs_create_ancestors(g_zfs, argv[0]) != 0)
820 			goto error;
821 	}
822 
823 	/* pass to libzfs */
824 	if (zfs_create(g_zfs, argv[0], type, props) != 0)
825 		goto error;
826 
827 	if ((zhp = zfs_open(g_zfs, argv[0], ZFS_TYPE_DATASET)) == NULL)
828 		goto error;
829 
830 	ret = 0;
831 	/*
832 	 * if the user doesn't want the dataset automatically mounted,
833 	 * then skip the mount/share step
834 	 */
835 	if (zfs_prop_valid_for_type(ZFS_PROP_CANMOUNT, type))
836 		canmount = zfs_prop_get_int(zhp, ZFS_PROP_CANMOUNT);
837 
838 	/*
839 	 * Mount and/or share the new filesystem as appropriate.  We provide a
840 	 * verbose error message to let the user know that their filesystem was
841 	 * in fact created, even if we failed to mount or share it.
842 	 */
843 	if (canmount == ZFS_CANMOUNT_ON) {
844 		if (zfs_mount(zhp, NULL, 0) != 0) {
845 			(void) fprintf(stderr, gettext("filesystem "
846 			    "successfully created, but not mounted\n"));
847 			ret = 1;
848 		} else if (zfs_share(zhp) != 0) {
849 			(void) fprintf(stderr, gettext("filesystem "
850 			    "successfully created, but not shared\n"));
851 			ret = 1;
852 		}
853 	}
854 
855 error:
856 	if (zhp)
857 		zfs_close(zhp);
858 	nvlist_free(props);
859 	return (ret);
860 badusage:
861 	nvlist_free(props);
862 	usage(B_FALSE);
863 	return (2);
864 }
865 
866 /*
867  * zfs destroy [-rRf] <fs, vol>
868  * zfs destroy [-rRd] <snap>
869  *
870  *	-r	Recursively destroy all children
871  *	-R	Recursively destroy all dependents, including clones
872  *	-f	Force unmounting of any dependents
873  *	-d	If we can't destroy now, mark for deferred destruction
874  *
875  * Destroys the given dataset.  By default, it will unmount any filesystems,
876  * and refuse to destroy a dataset that has any dependents.  A dependent can
877  * either be a child, or a clone of a child.
878  */
879 typedef struct destroy_cbdata {
880 	boolean_t	cb_first;
881 	boolean_t	cb_force;
882 	boolean_t	cb_recurse;
883 	boolean_t	cb_error;
884 	boolean_t	cb_doclones;
885 	zfs_handle_t	*cb_target;
886 	boolean_t	cb_defer_destroy;
887 	boolean_t	cb_verbose;
888 	boolean_t	cb_parsable;
889 	boolean_t	cb_dryrun;
890 	nvlist_t	*cb_nvl;
891 
892 	/* first snap in contiguous run */
893 	char		*cb_firstsnap;
894 	/* previous snap in contiguous run */
895 	char		*cb_prevsnap;
896 	int64_t		cb_snapused;
897 	char		*cb_snapspec;
898 } destroy_cbdata_t;
899 
900 /*
901  * Check for any dependents based on the '-r' or '-R' flags.
902  */
903 static int
904 destroy_check_dependent(zfs_handle_t *zhp, void *data)
905 {
906 	destroy_cbdata_t *cbp = data;
907 	const char *tname = zfs_get_name(cbp->cb_target);
908 	const char *name = zfs_get_name(zhp);
909 
910 	if (strncmp(tname, name, strlen(tname)) == 0 &&
911 	    (name[strlen(tname)] == '/' || name[strlen(tname)] == '@')) {
912 		/*
913 		 * This is a direct descendant, not a clone somewhere else in
914 		 * the hierarchy.
915 		 */
916 		if (cbp->cb_recurse)
917 			goto out;
918 
919 		if (cbp->cb_first) {
920 			(void) fprintf(stderr, gettext("cannot destroy '%s': "
921 			    "%s has children\n"),
922 			    zfs_get_name(cbp->cb_target),
923 			    zfs_type_to_name(zfs_get_type(cbp->cb_target)));
924 			(void) fprintf(stderr, gettext("use '-r' to destroy "
925 			    "the following datasets:\n"));
926 			cbp->cb_first = B_FALSE;
927 			cbp->cb_error = B_TRUE;
928 		}
929 
930 		(void) fprintf(stderr, "%s\n", zfs_get_name(zhp));
931 	} else {
932 		/*
933 		 * This is a clone.  We only want to report this if the '-r'
934 		 * wasn't specified, or the target is a snapshot.
935 		 */
936 		if (!cbp->cb_recurse &&
937 		    zfs_get_type(cbp->cb_target) != ZFS_TYPE_SNAPSHOT)
938 			goto out;
939 
940 		if (cbp->cb_first) {
941 			(void) fprintf(stderr, gettext("cannot destroy '%s': "
942 			    "%s has dependent clones\n"),
943 			    zfs_get_name(cbp->cb_target),
944 			    zfs_type_to_name(zfs_get_type(cbp->cb_target)));
945 			(void) fprintf(stderr, gettext("use '-R' to destroy "
946 			    "the following datasets:\n"));
947 			cbp->cb_first = B_FALSE;
948 			cbp->cb_error = B_TRUE;
949 			cbp->cb_dryrun = B_TRUE;
950 		}
951 
952 		(void) fprintf(stderr, "%s\n", zfs_get_name(zhp));
953 	}
954 
955 out:
956 	zfs_close(zhp);
957 	return (0);
958 }
959 
960 static int
961 destroy_callback(zfs_handle_t *zhp, void *data)
962 {
963 	destroy_cbdata_t *cb = data;
964 	const char *name = zfs_get_name(zhp);
965 
966 	if (cb->cb_verbose) {
967 		if (cb->cb_parsable) {
968 			(void) printf("destroy\t%s\n", name);
969 		} else if (cb->cb_dryrun) {
970 			(void) printf(gettext("would destroy %s\n"),
971 			    name);
972 		} else {
973 			(void) printf(gettext("will destroy %s\n"),
974 			    name);
975 		}
976 	}
977 
978 	/*
979 	 * Ignore pools (which we've already flagged as an error before getting
980 	 * here).
981 	 */
982 	if (strchr(zfs_get_name(zhp), '/') == NULL &&
983 	    zfs_get_type(zhp) == ZFS_TYPE_FILESYSTEM) {
984 		zfs_close(zhp);
985 		return (0);
986 	}
987 
988 	if (!cb->cb_dryrun) {
989 		if (zfs_unmount(zhp, NULL, cb->cb_force ? MS_FORCE : 0) != 0 ||
990 		    zfs_destroy(zhp, cb->cb_defer_destroy) != 0) {
991 			zfs_close(zhp);
992 			return (-1);
993 		}
994 	}
995 
996 	zfs_close(zhp);
997 	return (0);
998 }
999 
1000 static int
1001 destroy_print_cb(zfs_handle_t *zhp, void *arg)
1002 {
1003 	destroy_cbdata_t *cb = arg;
1004 	const char *name = zfs_get_name(zhp);
1005 	int err = 0;
1006 
1007 	if (nvlist_exists(cb->cb_nvl, name)) {
1008 		if (cb->cb_firstsnap == NULL)
1009 			cb->cb_firstsnap = strdup(name);
1010 		if (cb->cb_prevsnap != NULL)
1011 			free(cb->cb_prevsnap);
1012 		/* this snap continues the current range */
1013 		cb->cb_prevsnap = strdup(name);
1014 		if (cb->cb_firstsnap == NULL || cb->cb_prevsnap == NULL)
1015 			nomem();
1016 		if (cb->cb_verbose) {
1017 			if (cb->cb_parsable) {
1018 				(void) printf("destroy\t%s\n", name);
1019 			} else if (cb->cb_dryrun) {
1020 				(void) printf(gettext("would destroy %s\n"),
1021 				    name);
1022 			} else {
1023 				(void) printf(gettext("will destroy %s\n"),
1024 				    name);
1025 			}
1026 		}
1027 	} else if (cb->cb_firstsnap != NULL) {
1028 		/* end of this range */
1029 		uint64_t used = 0;
1030 		err = lzc_snaprange_space(cb->cb_firstsnap,
1031 		    cb->cb_prevsnap, &used);
1032 		cb->cb_snapused += used;
1033 		free(cb->cb_firstsnap);
1034 		cb->cb_firstsnap = NULL;
1035 		free(cb->cb_prevsnap);
1036 		cb->cb_prevsnap = NULL;
1037 	}
1038 	zfs_close(zhp);
1039 	return (err);
1040 }
1041 
1042 static int
1043 destroy_print_snapshots(zfs_handle_t *fs_zhp, destroy_cbdata_t *cb)
1044 {
1045 	int err = 0;
1046 	assert(cb->cb_firstsnap == NULL);
1047 	assert(cb->cb_prevsnap == NULL);
1048 	err = zfs_iter_snapshots_sorted(fs_zhp, destroy_print_cb, cb);
1049 	if (cb->cb_firstsnap != NULL) {
1050 		uint64_t used = 0;
1051 		if (err == 0) {
1052 			err = lzc_snaprange_space(cb->cb_firstsnap,
1053 			    cb->cb_prevsnap, &used);
1054 		}
1055 		cb->cb_snapused += used;
1056 		free(cb->cb_firstsnap);
1057 		cb->cb_firstsnap = NULL;
1058 		free(cb->cb_prevsnap);
1059 		cb->cb_prevsnap = NULL;
1060 	}
1061 	return (err);
1062 }
1063 
1064 static int
1065 snapshot_to_nvl_cb(zfs_handle_t *zhp, void *arg)
1066 {
1067 	destroy_cbdata_t *cb = arg;
1068 	int err = 0;
1069 
1070 	/* Check for clones. */
1071 	if (!cb->cb_doclones && !cb->cb_defer_destroy) {
1072 		cb->cb_target = zhp;
1073 		cb->cb_first = B_TRUE;
1074 		err = zfs_iter_dependents(zhp, B_TRUE,
1075 		    destroy_check_dependent, cb);
1076 	}
1077 
1078 	if (err == 0) {
1079 		if (nvlist_add_boolean(cb->cb_nvl, zfs_get_name(zhp)))
1080 			nomem();
1081 	}
1082 	zfs_close(zhp);
1083 	return (err);
1084 }
1085 
1086 static int
1087 gather_snapshots(zfs_handle_t *zhp, void *arg)
1088 {
1089 	destroy_cbdata_t *cb = arg;
1090 	int err = 0;
1091 
1092 	err = zfs_iter_snapspec(zhp, cb->cb_snapspec, snapshot_to_nvl_cb, cb);
1093 	if (err == ENOENT)
1094 		err = 0;
1095 	if (err != 0)
1096 		goto out;
1097 
1098 	if (cb->cb_verbose) {
1099 		err = destroy_print_snapshots(zhp, cb);
1100 		if (err != 0)
1101 			goto out;
1102 	}
1103 
1104 	if (cb->cb_recurse)
1105 		err = zfs_iter_filesystems(zhp, gather_snapshots, cb);
1106 
1107 out:
1108 	zfs_close(zhp);
1109 	return (err);
1110 }
1111 
1112 static int
1113 destroy_clones(destroy_cbdata_t *cb)
1114 {
1115 	nvpair_t *pair;
1116 	for (pair = nvlist_next_nvpair(cb->cb_nvl, NULL);
1117 	    pair != NULL;
1118 	    pair = nvlist_next_nvpair(cb->cb_nvl, pair)) {
1119 		zfs_handle_t *zhp = zfs_open(g_zfs, nvpair_name(pair),
1120 		    ZFS_TYPE_SNAPSHOT);
1121 		if (zhp != NULL) {
1122 			boolean_t defer = cb->cb_defer_destroy;
1123 			int err = 0;
1124 
1125 			/*
1126 			 * We can't defer destroy non-snapshots, so set it to
1127 			 * false while destroying the clones.
1128 			 */
1129 			cb->cb_defer_destroy = B_FALSE;
1130 			err = zfs_iter_dependents(zhp, B_FALSE,
1131 			    destroy_callback, cb);
1132 			cb->cb_defer_destroy = defer;
1133 			zfs_close(zhp);
1134 			if (err != 0)
1135 				return (err);
1136 		}
1137 	}
1138 	return (0);
1139 }
1140 
1141 static int
1142 zfs_do_destroy(int argc, char **argv)
1143 {
1144 	destroy_cbdata_t cb = { 0 };
1145 	int c;
1146 	zfs_handle_t *zhp;
1147 	char *at;
1148 	zfs_type_t type = ZFS_TYPE_DATASET;
1149 
1150 	/* check options */
1151 	while ((c = getopt(argc, argv, "vpndfrR")) != -1) {
1152 		switch (c) {
1153 		case 'v':
1154 			cb.cb_verbose = B_TRUE;
1155 			break;
1156 		case 'p':
1157 			cb.cb_verbose = B_TRUE;
1158 			cb.cb_parsable = B_TRUE;
1159 			break;
1160 		case 'n':
1161 			cb.cb_dryrun = B_TRUE;
1162 			break;
1163 		case 'd':
1164 			cb.cb_defer_destroy = B_TRUE;
1165 			type = ZFS_TYPE_SNAPSHOT;
1166 			break;
1167 		case 'f':
1168 			cb.cb_force = B_TRUE;
1169 			break;
1170 		case 'r':
1171 			cb.cb_recurse = B_TRUE;
1172 			break;
1173 		case 'R':
1174 			cb.cb_recurse = B_TRUE;
1175 			cb.cb_doclones = B_TRUE;
1176 			break;
1177 		case '?':
1178 		default:
1179 			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
1180 			    optopt);
1181 			usage(B_FALSE);
1182 		}
1183 	}
1184 
1185 	argc -= optind;
1186 	argv += optind;
1187 
1188 	/* check number of arguments */
1189 	if (argc == 0) {
1190 		(void) fprintf(stderr, gettext("missing dataset argument\n"));
1191 		usage(B_FALSE);
1192 	}
1193 	if (argc > 1) {
1194 		(void) fprintf(stderr, gettext("too many arguments\n"));
1195 		usage(B_FALSE);
1196 	}
1197 
1198 	at = strchr(argv[0], '@');
1199 	if (at != NULL) {
1200 		int err = 0;
1201 
1202 		/* Build the list of snaps to destroy in cb_nvl. */
1203 		if (nvlist_alloc(&cb.cb_nvl, NV_UNIQUE_NAME, 0) != 0)
1204 			nomem();
1205 
1206 		*at = '\0';
1207 		zhp = zfs_open(g_zfs, argv[0],
1208 		    ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME);
1209 		if (zhp == NULL)
1210 			return (1);
1211 
1212 		cb.cb_snapspec = at + 1;
1213 		if (gather_snapshots(zfs_handle_dup(zhp), &cb) != 0 ||
1214 		    cb.cb_error) {
1215 			zfs_close(zhp);
1216 			nvlist_free(cb.cb_nvl);
1217 			return (1);
1218 		}
1219 
1220 		if (nvlist_empty(cb.cb_nvl)) {
1221 			(void) fprintf(stderr, gettext("could not find any "
1222 			    "snapshots to destroy; check snapshot names.\n"));
1223 			zfs_close(zhp);
1224 			nvlist_free(cb.cb_nvl);
1225 			return (1);
1226 		}
1227 
1228 		if (cb.cb_verbose) {
1229 			char buf[16];
1230 			zfs_nicenum(cb.cb_snapused, buf, sizeof (buf));
1231 			if (cb.cb_parsable) {
1232 				(void) printf("reclaim\t%llu\n",
1233 				    cb.cb_snapused);
1234 			} else if (cb.cb_dryrun) {
1235 				(void) printf(gettext("would reclaim %s\n"),
1236 				    buf);
1237 			} else {
1238 				(void) printf(gettext("will reclaim %s\n"),
1239 				    buf);
1240 			}
1241 		}
1242 
1243 		if (!cb.cb_dryrun) {
1244 			if (cb.cb_doclones)
1245 				err = destroy_clones(&cb);
1246 			if (err == 0) {
1247 				err = zfs_destroy_snaps_nvl(zhp, cb.cb_nvl,
1248 				    cb.cb_defer_destroy);
1249 			}
1250 		}
1251 
1252 		zfs_close(zhp);
1253 		nvlist_free(cb.cb_nvl);
1254 		if (err != 0)
1255 			return (1);
1256 	} else {
1257 		/* Open the given dataset */
1258 		if ((zhp = zfs_open(g_zfs, argv[0], type)) == NULL)
1259 			return (1);
1260 
1261 		cb.cb_target = zhp;
1262 
1263 		/*
1264 		 * Perform an explicit check for pools before going any further.
1265 		 */
1266 		if (!cb.cb_recurse && strchr(zfs_get_name(zhp), '/') == NULL &&
1267 		    zfs_get_type(zhp) == ZFS_TYPE_FILESYSTEM) {
1268 			(void) fprintf(stderr, gettext("cannot destroy '%s': "
1269 			    "operation does not apply to pools\n"),
1270 			    zfs_get_name(zhp));
1271 			(void) fprintf(stderr, gettext("use 'zfs destroy -r "
1272 			    "%s' to destroy all datasets in the pool\n"),
1273 			    zfs_get_name(zhp));
1274 			(void) fprintf(stderr, gettext("use 'zpool destroy %s' "
1275 			    "to destroy the pool itself\n"), zfs_get_name(zhp));
1276 			zfs_close(zhp);
1277 			return (1);
1278 		}
1279 
1280 		/*
1281 		 * Check for any dependents and/or clones.
1282 		 */
1283 		cb.cb_first = B_TRUE;
1284 		if (!cb.cb_doclones &&
1285 		    zfs_iter_dependents(zhp, B_TRUE, destroy_check_dependent,
1286 		    &cb) != 0) {
1287 			zfs_close(zhp);
1288 			return (1);
1289 		}
1290 
1291 		if (cb.cb_error) {
1292 			zfs_close(zhp);
1293 			return (1);
1294 		}
1295 
1296 		if (zfs_iter_dependents(zhp, B_FALSE, destroy_callback,
1297 		    &cb) != 0) {
1298 			zfs_close(zhp);
1299 			return (1);
1300 		}
1301 
1302 		/*
1303 		 * Do the real thing.  The callback will close the
1304 		 * handle regardless of whether it succeeds or not.
1305 		 */
1306 		if (destroy_callback(zhp, &cb) != 0)
1307 			return (1);
1308 	}
1309 
1310 	return (0);
1311 }
1312 
1313 static boolean_t
1314 is_recvd_column(zprop_get_cbdata_t *cbp)
1315 {
1316 	int i;
1317 	zfs_get_column_t col;
1318 
1319 	for (i = 0; i < ZFS_GET_NCOLS &&
1320 	    (col = cbp->cb_columns[i]) != GET_COL_NONE; i++)
1321 		if (col == GET_COL_RECVD)
1322 			return (B_TRUE);
1323 	return (B_FALSE);
1324 }
1325 
1326 /*
1327  * zfs get [-rHp] [-o all | field[,field]...] [-s source[,source]...]
1328  *	< all | property[,property]... > < fs | snap | vol > ...
1329  *
1330  *	-r	recurse over any child datasets
1331  *	-H	scripted mode.  Headers are stripped, and fields are separated
1332  *		by tabs instead of spaces.
1333  *	-o	Set of fields to display.  One of "name,property,value,
1334  *		received,source". Default is "name,property,value,source".
1335  *		"all" is an alias for all five.
1336  *	-s	Set of sources to allow.  One of
1337  *		"local,default,inherited,received,temporary,none".  Default is
1338  *		all six.
1339  *	-p	Display values in parsable (literal) format.
1340  *
1341  *  Prints properties for the given datasets.  The user can control which
1342  *  columns to display as well as which property types to allow.
1343  */
1344 
1345 /*
1346  * Invoked to display the properties for a single dataset.
1347  */
1348 static int
1349 get_callback(zfs_handle_t *zhp, void *data)
1350 {
1351 	char buf[ZFS_MAXPROPLEN];
1352 	char rbuf[ZFS_MAXPROPLEN];
1353 	zprop_source_t sourcetype;
1354 	char source[ZFS_MAXNAMELEN];
1355 	zprop_get_cbdata_t *cbp = data;
1356 	nvlist_t *user_props = zfs_get_user_props(zhp);
1357 	zprop_list_t *pl = cbp->cb_proplist;
1358 	nvlist_t *propval;
1359 	char *strval;
1360 	char *sourceval;
1361 	boolean_t received = is_recvd_column(cbp);
1362 
1363 	for (; pl != NULL; pl = pl->pl_next) {
1364 		char *recvdval = NULL;
1365 		/*
1366 		 * Skip the special fake placeholder.  This will also skip over
1367 		 * the name property when 'all' is specified.
1368 		 */
1369 		if (pl->pl_prop == ZFS_PROP_NAME &&
1370 		    pl == cbp->cb_proplist)
1371 			continue;
1372 
1373 		if (pl->pl_prop != ZPROP_INVAL) {
1374 			if (zfs_prop_get(zhp, pl->pl_prop, buf,
1375 			    sizeof (buf), &sourcetype, source,
1376 			    sizeof (source),
1377 			    cbp->cb_literal) != 0) {
1378 				if (pl->pl_all)
1379 					continue;
1380 				if (!zfs_prop_valid_for_type(pl->pl_prop,
1381 				    ZFS_TYPE_DATASET)) {
1382 					(void) fprintf(stderr,
1383 					    gettext("No such property '%s'\n"),
1384 					    zfs_prop_to_name(pl->pl_prop));
1385 					continue;
1386 				}
1387 				sourcetype = ZPROP_SRC_NONE;
1388 				(void) strlcpy(buf, "-", sizeof (buf));
1389 			}
1390 
1391 			if (received && (zfs_prop_get_recvd(zhp,
1392 			    zfs_prop_to_name(pl->pl_prop), rbuf, sizeof (rbuf),
1393 			    cbp->cb_literal) == 0))
1394 				recvdval = rbuf;
1395 
1396 			zprop_print_one_property(zfs_get_name(zhp), cbp,
1397 			    zfs_prop_to_name(pl->pl_prop),
1398 			    buf, sourcetype, source, recvdval);
1399 		} else if (zfs_prop_userquota(pl->pl_user_prop)) {
1400 			sourcetype = ZPROP_SRC_LOCAL;
1401 
1402 			if (zfs_prop_get_userquota(zhp, pl->pl_user_prop,
1403 			    buf, sizeof (buf), cbp->cb_literal) != 0) {
1404 				sourcetype = ZPROP_SRC_NONE;
1405 				(void) strlcpy(buf, "-", sizeof (buf));
1406 			}
1407 
1408 			zprop_print_one_property(zfs_get_name(zhp), cbp,
1409 			    pl->pl_user_prop, buf, sourcetype, source, NULL);
1410 		} else if (zfs_prop_written(pl->pl_user_prop)) {
1411 			sourcetype = ZPROP_SRC_LOCAL;
1412 
1413 			if (zfs_prop_get_written(zhp, pl->pl_user_prop,
1414 			    buf, sizeof (buf), cbp->cb_literal) != 0) {
1415 				sourcetype = ZPROP_SRC_NONE;
1416 				(void) strlcpy(buf, "-", sizeof (buf));
1417 			}
1418 
1419 			zprop_print_one_property(zfs_get_name(zhp), cbp,
1420 			    pl->pl_user_prop, buf, sourcetype, source, NULL);
1421 		} else {
1422 			if (nvlist_lookup_nvlist(user_props,
1423 			    pl->pl_user_prop, &propval) != 0) {
1424 				if (pl->pl_all)
1425 					continue;
1426 				sourcetype = ZPROP_SRC_NONE;
1427 				strval = "-";
1428 			} else {
1429 				verify(nvlist_lookup_string(propval,
1430 				    ZPROP_VALUE, &strval) == 0);
1431 				verify(nvlist_lookup_string(propval,
1432 				    ZPROP_SOURCE, &sourceval) == 0);
1433 
1434 				if (strcmp(sourceval,
1435 				    zfs_get_name(zhp)) == 0) {
1436 					sourcetype = ZPROP_SRC_LOCAL;
1437 				} else if (strcmp(sourceval,
1438 				    ZPROP_SOURCE_VAL_RECVD) == 0) {
1439 					sourcetype = ZPROP_SRC_RECEIVED;
1440 				} else {
1441 					sourcetype = ZPROP_SRC_INHERITED;
1442 					(void) strlcpy(source,
1443 					    sourceval, sizeof (source));
1444 				}
1445 			}
1446 
1447 			if (received && (zfs_prop_get_recvd(zhp,
1448 			    pl->pl_user_prop, rbuf, sizeof (rbuf),
1449 			    cbp->cb_literal) == 0))
1450 				recvdval = rbuf;
1451 
1452 			zprop_print_one_property(zfs_get_name(zhp), cbp,
1453 			    pl->pl_user_prop, strval, sourcetype,
1454 			    source, recvdval);
1455 		}
1456 	}
1457 
1458 	return (0);
1459 }
1460 
1461 static int
1462 zfs_do_get(int argc, char **argv)
1463 {
1464 	zprop_get_cbdata_t cb = { 0 };
1465 	int i, c, flags = ZFS_ITER_ARGS_CAN_BE_PATHS;
1466 	int types = ZFS_TYPE_DATASET;
1467 	char *value, *fields;
1468 	int ret = 0;
1469 	int limit = 0;
1470 	zprop_list_t fake_name = { 0 };
1471 
1472 	/*
1473 	 * Set up default columns and sources.
1474 	 */
1475 	cb.cb_sources = ZPROP_SRC_ALL;
1476 	cb.cb_columns[0] = GET_COL_NAME;
1477 	cb.cb_columns[1] = GET_COL_PROPERTY;
1478 	cb.cb_columns[2] = GET_COL_VALUE;
1479 	cb.cb_columns[3] = GET_COL_SOURCE;
1480 	cb.cb_type = ZFS_TYPE_DATASET;
1481 
1482 	/* check options */
1483 	while ((c = getopt(argc, argv, ":d:o:s:rt:Hp")) != -1) {
1484 		switch (c) {
1485 		case 'p':
1486 			cb.cb_literal = B_TRUE;
1487 			break;
1488 		case 'd':
1489 			limit = parse_depth(optarg, &flags);
1490 			break;
1491 		case 'r':
1492 			flags |= ZFS_ITER_RECURSE;
1493 			break;
1494 		case 'H':
1495 			cb.cb_scripted = B_TRUE;
1496 			break;
1497 		case ':':
1498 			(void) fprintf(stderr, gettext("missing argument for "
1499 			    "'%c' option\n"), optopt);
1500 			usage(B_FALSE);
1501 			break;
1502 		case 'o':
1503 			/*
1504 			 * Process the set of columns to display.  We zero out
1505 			 * the structure to give us a blank slate.
1506 			 */
1507 			bzero(&cb.cb_columns, sizeof (cb.cb_columns));
1508 			i = 0;
1509 			while (*optarg != '\0') {
1510 				static char *col_subopts[] =
1511 				    { "name", "property", "value", "received",
1512 				    "source", "all", NULL };
1513 
1514 				if (i == ZFS_GET_NCOLS) {
1515 					(void) fprintf(stderr, gettext("too "
1516 					    "many fields given to -o "
1517 					    "option\n"));
1518 					usage(B_FALSE);
1519 				}
1520 
1521 				switch (getsubopt(&optarg, col_subopts,
1522 				    &value)) {
1523 				case 0:
1524 					cb.cb_columns[i++] = GET_COL_NAME;
1525 					break;
1526 				case 1:
1527 					cb.cb_columns[i++] = GET_COL_PROPERTY;
1528 					break;
1529 				case 2:
1530 					cb.cb_columns[i++] = GET_COL_VALUE;
1531 					break;
1532 				case 3:
1533 					cb.cb_columns[i++] = GET_COL_RECVD;
1534 					flags |= ZFS_ITER_RECVD_PROPS;
1535 					break;
1536 				case 4:
1537 					cb.cb_columns[i++] = GET_COL_SOURCE;
1538 					break;
1539 				case 5:
1540 					if (i > 0) {
1541 						(void) fprintf(stderr,
1542 						    gettext("\"all\" conflicts "
1543 						    "with specific fields "
1544 						    "given to -o option\n"));
1545 						usage(B_FALSE);
1546 					}
1547 					cb.cb_columns[0] = GET_COL_NAME;
1548 					cb.cb_columns[1] = GET_COL_PROPERTY;
1549 					cb.cb_columns[2] = GET_COL_VALUE;
1550 					cb.cb_columns[3] = GET_COL_RECVD;
1551 					cb.cb_columns[4] = GET_COL_SOURCE;
1552 					flags |= ZFS_ITER_RECVD_PROPS;
1553 					i = ZFS_GET_NCOLS;
1554 					break;
1555 				default:
1556 					(void) fprintf(stderr,
1557 					    gettext("invalid column name "
1558 					    "'%s'\n"), value);
1559 					usage(B_FALSE);
1560 				}
1561 			}
1562 			break;
1563 
1564 		case 's':
1565 			cb.cb_sources = 0;
1566 			while (*optarg != '\0') {
1567 				static char *source_subopts[] = {
1568 					"local", "default", "inherited",
1569 					"received", "temporary", "none",
1570 					NULL };
1571 
1572 				switch (getsubopt(&optarg, source_subopts,
1573 				    &value)) {
1574 				case 0:
1575 					cb.cb_sources |= ZPROP_SRC_LOCAL;
1576 					break;
1577 				case 1:
1578 					cb.cb_sources |= ZPROP_SRC_DEFAULT;
1579 					break;
1580 				case 2:
1581 					cb.cb_sources |= ZPROP_SRC_INHERITED;
1582 					break;
1583 				case 3:
1584 					cb.cb_sources |= ZPROP_SRC_RECEIVED;
1585 					break;
1586 				case 4:
1587 					cb.cb_sources |= ZPROP_SRC_TEMPORARY;
1588 					break;
1589 				case 5:
1590 					cb.cb_sources |= ZPROP_SRC_NONE;
1591 					break;
1592 				default:
1593 					(void) fprintf(stderr,
1594 					    gettext("invalid source "
1595 					    "'%s'\n"), value);
1596 					usage(B_FALSE);
1597 				}
1598 			}
1599 			break;
1600 
1601 		case 't':
1602 			types = 0;
1603 			flags &= ~ZFS_ITER_PROP_LISTSNAPS;
1604 			while (*optarg != '\0') {
1605 				static char *type_subopts[] = { "filesystem",
1606 				    "volume", "snapshot", "all", NULL };
1607 
1608 				switch (getsubopt(&optarg, type_subopts,
1609 				    &value)) {
1610 				case 0:
1611 					types |= ZFS_TYPE_FILESYSTEM;
1612 					break;
1613 				case 1:
1614 					types |= ZFS_TYPE_VOLUME;
1615 					break;
1616 				case 2:
1617 					types |= ZFS_TYPE_SNAPSHOT;
1618 					break;
1619 				case 3:
1620 					types = ZFS_TYPE_DATASET;
1621 					break;
1622 
1623 				default:
1624 					(void) fprintf(stderr,
1625 					    gettext("invalid type '%s'\n"),
1626 					    value);
1627 					usage(B_FALSE);
1628 				}
1629 			}
1630 			break;
1631 
1632 		case '?':
1633 			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
1634 			    optopt);
1635 			usage(B_FALSE);
1636 		}
1637 	}
1638 
1639 	argc -= optind;
1640 	argv += optind;
1641 
1642 	if (argc < 1) {
1643 		(void) fprintf(stderr, gettext("missing property "
1644 		    "argument\n"));
1645 		usage(B_FALSE);
1646 	}
1647 
1648 	fields = argv[0];
1649 
1650 	if (zprop_get_list(g_zfs, fields, &cb.cb_proplist, ZFS_TYPE_DATASET)
1651 	    != 0)
1652 		usage(B_FALSE);
1653 
1654 	argc--;
1655 	argv++;
1656 
1657 	/*
1658 	 * As part of zfs_expand_proplist(), we keep track of the maximum column
1659 	 * width for each property.  For the 'NAME' (and 'SOURCE') columns, we
1660 	 * need to know the maximum name length.  However, the user likely did
1661 	 * not specify 'name' as one of the properties to fetch, so we need to
1662 	 * make sure we always include at least this property for
1663 	 * print_get_headers() to work properly.
1664 	 */
1665 	if (cb.cb_proplist != NULL) {
1666 		fake_name.pl_prop = ZFS_PROP_NAME;
1667 		fake_name.pl_width = strlen(gettext("NAME"));
1668 		fake_name.pl_next = cb.cb_proplist;
1669 		cb.cb_proplist = &fake_name;
1670 	}
1671 
1672 	cb.cb_first = B_TRUE;
1673 
1674 	/* run for each object */
1675 	ret = zfs_for_each(argc, argv, flags, types, NULL,
1676 	    &cb.cb_proplist, limit, get_callback, &cb);
1677 
1678 	if (cb.cb_proplist == &fake_name)
1679 		zprop_free_list(fake_name.pl_next);
1680 	else
1681 		zprop_free_list(cb.cb_proplist);
1682 
1683 	return (ret);
1684 }
1685 
1686 /*
1687  * inherit [-rS] <property> <fs|vol> ...
1688  *
1689  *	-r	Recurse over all children
1690  *	-S	Revert to received value, if any
1691  *
1692  * For each dataset specified on the command line, inherit the given property
1693  * from its parent.  Inheriting a property at the pool level will cause it to
1694  * use the default value.  The '-r' flag will recurse over all children, and is
1695  * useful for setting a property on a hierarchy-wide basis, regardless of any
1696  * local modifications for each dataset.
1697  */
1698 
1699 typedef struct inherit_cbdata {
1700 	const char *cb_propname;
1701 	boolean_t cb_received;
1702 } inherit_cbdata_t;
1703 
1704 static int
1705 inherit_recurse_cb(zfs_handle_t *zhp, void *data)
1706 {
1707 	inherit_cbdata_t *cb = data;
1708 	zfs_prop_t prop = zfs_name_to_prop(cb->cb_propname);
1709 
1710 	/*
1711 	 * If we're doing it recursively, then ignore properties that
1712 	 * are not valid for this type of dataset.
1713 	 */
1714 	if (prop != ZPROP_INVAL &&
1715 	    !zfs_prop_valid_for_type(prop, zfs_get_type(zhp)))
1716 		return (0);
1717 
1718 	return (zfs_prop_inherit(zhp, cb->cb_propname, cb->cb_received) != 0);
1719 }
1720 
1721 static int
1722 inherit_cb(zfs_handle_t *zhp, void *data)
1723 {
1724 	inherit_cbdata_t *cb = data;
1725 
1726 	return (zfs_prop_inherit(zhp, cb->cb_propname, cb->cb_received) != 0);
1727 }
1728 
1729 static int
1730 zfs_do_inherit(int argc, char **argv)
1731 {
1732 	int c;
1733 	zfs_prop_t prop;
1734 	inherit_cbdata_t cb = { 0 };
1735 	char *propname;
1736 	int ret = 0;
1737 	int flags = 0;
1738 	boolean_t received = B_FALSE;
1739 
1740 	/* check options */
1741 	while ((c = getopt(argc, argv, "rS")) != -1) {
1742 		switch (c) {
1743 		case 'r':
1744 			flags |= ZFS_ITER_RECURSE;
1745 			break;
1746 		case 'S':
1747 			received = B_TRUE;
1748 			break;
1749 		case '?':
1750 		default:
1751 			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
1752 			    optopt);
1753 			usage(B_FALSE);
1754 		}
1755 	}
1756 
1757 	argc -= optind;
1758 	argv += optind;
1759 
1760 	/* check number of arguments */
1761 	if (argc < 1) {
1762 		(void) fprintf(stderr, gettext("missing property argument\n"));
1763 		usage(B_FALSE);
1764 	}
1765 	if (argc < 2) {
1766 		(void) fprintf(stderr, gettext("missing dataset argument\n"));
1767 		usage(B_FALSE);
1768 	}
1769 
1770 	propname = argv[0];
1771 	argc--;
1772 	argv++;
1773 
1774 	if ((prop = zfs_name_to_prop(propname)) != ZPROP_INVAL) {
1775 		if (zfs_prop_readonly(prop)) {
1776 			(void) fprintf(stderr, gettext(
1777 			    "%s property is read-only\n"),
1778 			    propname);
1779 			return (1);
1780 		}
1781 		if (!zfs_prop_inheritable(prop) && !received) {
1782 			(void) fprintf(stderr, gettext("'%s' property cannot "
1783 			    "be inherited\n"), propname);
1784 			if (prop == ZFS_PROP_QUOTA ||
1785 			    prop == ZFS_PROP_RESERVATION ||
1786 			    prop == ZFS_PROP_REFQUOTA ||
1787 			    prop == ZFS_PROP_REFRESERVATION)
1788 				(void) fprintf(stderr, gettext("use 'zfs set "
1789 				    "%s=none' to clear\n"), propname);
1790 			return (1);
1791 		}
1792 		if (received && (prop == ZFS_PROP_VOLSIZE ||
1793 		    prop == ZFS_PROP_VERSION)) {
1794 			(void) fprintf(stderr, gettext("'%s' property cannot "
1795 			    "be reverted to a received value\n"), propname);
1796 			return (1);
1797 		}
1798 	} else if (!zfs_prop_user(propname)) {
1799 		(void) fprintf(stderr, gettext("invalid property '%s'\n"),
1800 		    propname);
1801 		usage(B_FALSE);
1802 	}
1803 
1804 	cb.cb_propname = propname;
1805 	cb.cb_received = received;
1806 
1807 	if (flags & ZFS_ITER_RECURSE) {
1808 		ret = zfs_for_each(argc, argv, flags, ZFS_TYPE_DATASET,
1809 		    NULL, NULL, 0, inherit_recurse_cb, &cb);
1810 	} else {
1811 		ret = zfs_for_each(argc, argv, flags, ZFS_TYPE_DATASET,
1812 		    NULL, NULL, 0, inherit_cb, &cb);
1813 	}
1814 
1815 	return (ret);
1816 }
1817 
1818 typedef struct upgrade_cbdata {
1819 	uint64_t cb_numupgraded;
1820 	uint64_t cb_numsamegraded;
1821 	uint64_t cb_numfailed;
1822 	uint64_t cb_version;
1823 	boolean_t cb_newer;
1824 	boolean_t cb_foundone;
1825 	char cb_lastfs[ZFS_MAXNAMELEN];
1826 } upgrade_cbdata_t;
1827 
1828 static int
1829 same_pool(zfs_handle_t *zhp, const char *name)
1830 {
1831 	int len1 = strcspn(name, "/@");
1832 	const char *zhname = zfs_get_name(zhp);
1833 	int len2 = strcspn(zhname, "/@");
1834 
1835 	if (len1 != len2)
1836 		return (B_FALSE);
1837 	return (strncmp(name, zhname, len1) == 0);
1838 }
1839 
1840 static int
1841 upgrade_list_callback(zfs_handle_t *zhp, void *data)
1842 {
1843 	upgrade_cbdata_t *cb = data;
1844 	int version = zfs_prop_get_int(zhp, ZFS_PROP_VERSION);
1845 
1846 	/* list if it's old/new */
1847 	if ((!cb->cb_newer && version < ZPL_VERSION) ||
1848 	    (cb->cb_newer && version > ZPL_VERSION)) {
1849 		char *str;
1850 		if (cb->cb_newer) {
1851 			str = gettext("The following filesystems are "
1852 			    "formatted using a newer software version and\n"
1853 			    "cannot be accessed on the current system.\n\n");
1854 		} else {
1855 			str = gettext("The following filesystems are "
1856 			    "out of date, and can be upgraded.  After being\n"
1857 			    "upgraded, these filesystems (and any 'zfs send' "
1858 			    "streams generated from\n"
1859 			    "subsequent snapshots) will no longer be "
1860 			    "accessible by older software versions.\n\n");
1861 		}
1862 
1863 		if (!cb->cb_foundone) {
1864 			(void) puts(str);
1865 			(void) printf(gettext("VER  FILESYSTEM\n"));
1866 			(void) printf(gettext("---  ------------\n"));
1867 			cb->cb_foundone = B_TRUE;
1868 		}
1869 
1870 		(void) printf("%2u   %s\n", version, zfs_get_name(zhp));
1871 	}
1872 
1873 	return (0);
1874 }
1875 
1876 static int
1877 upgrade_set_callback(zfs_handle_t *zhp, void *data)
1878 {
1879 	upgrade_cbdata_t *cb = data;
1880 	int version = zfs_prop_get_int(zhp, ZFS_PROP_VERSION);
1881 	int needed_spa_version;
1882 	int spa_version;
1883 
1884 	if (zfs_spa_version(zhp, &spa_version) < 0)
1885 		return (-1);
1886 
1887 	needed_spa_version = zfs_spa_version_map(cb->cb_version);
1888 
1889 	if (needed_spa_version < 0)
1890 		return (-1);
1891 
1892 	if (spa_version < needed_spa_version) {
1893 		/* can't upgrade */
1894 		(void) printf(gettext("%s: can not be "
1895 		    "upgraded; the pool version needs to first "
1896 		    "be upgraded\nto version %d\n\n"),
1897 		    zfs_get_name(zhp), needed_spa_version);
1898 		cb->cb_numfailed++;
1899 		return (0);
1900 	}
1901 
1902 	/* upgrade */
1903 	if (version < cb->cb_version) {
1904 		char verstr[16];
1905 		(void) snprintf(verstr, sizeof (verstr),
1906 		    "%llu", cb->cb_version);
1907 		if (cb->cb_lastfs[0] && !same_pool(zhp, cb->cb_lastfs)) {
1908 			/*
1909 			 * If they did "zfs upgrade -a", then we could
1910 			 * be doing ioctls to different pools.  We need
1911 			 * to log this history once to each pool, and bypass
1912 			 * the normal history logging that happens in main().
1913 			 */
1914 			(void) zpool_log_history(g_zfs, history_str);
1915 			log_history = B_FALSE;
1916 		}
1917 		if (zfs_prop_set(zhp, "version", verstr) == 0)
1918 			cb->cb_numupgraded++;
1919 		else
1920 			cb->cb_numfailed++;
1921 		(void) strcpy(cb->cb_lastfs, zfs_get_name(zhp));
1922 	} else if (version > cb->cb_version) {
1923 		/* can't downgrade */
1924 		(void) printf(gettext("%s: can not be downgraded; "
1925 		    "it is already at version %u\n"),
1926 		    zfs_get_name(zhp), version);
1927 		cb->cb_numfailed++;
1928 	} else {
1929 		cb->cb_numsamegraded++;
1930 	}
1931 	return (0);
1932 }
1933 
1934 /*
1935  * zfs upgrade
1936  * zfs upgrade -v
1937  * zfs upgrade [-r] [-V <version>] <-a | filesystem>
1938  */
1939 static int
1940 zfs_do_upgrade(int argc, char **argv)
1941 {
1942 	boolean_t all = B_FALSE;
1943 	boolean_t showversions = B_FALSE;
1944 	int ret = 0;
1945 	upgrade_cbdata_t cb = { 0 };
1946 	char c;
1947 	int flags = ZFS_ITER_ARGS_CAN_BE_PATHS;
1948 
1949 	/* check options */
1950 	while ((c = getopt(argc, argv, "rvV:a")) != -1) {
1951 		switch (c) {
1952 		case 'r':
1953 			flags |= ZFS_ITER_RECURSE;
1954 			break;
1955 		case 'v':
1956 			showversions = B_TRUE;
1957 			break;
1958 		case 'V':
1959 			if (zfs_prop_string_to_index(ZFS_PROP_VERSION,
1960 			    optarg, &cb.cb_version) != 0) {
1961 				(void) fprintf(stderr,
1962 				    gettext("invalid version %s\n"), optarg);
1963 				usage(B_FALSE);
1964 			}
1965 			break;
1966 		case 'a':
1967 			all = B_TRUE;
1968 			break;
1969 		case '?':
1970 		default:
1971 			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
1972 			    optopt);
1973 			usage(B_FALSE);
1974 		}
1975 	}
1976 
1977 	argc -= optind;
1978 	argv += optind;
1979 
1980 	if ((!all && !argc) && ((flags & ZFS_ITER_RECURSE) | cb.cb_version))
1981 		usage(B_FALSE);
1982 	if (showversions && (flags & ZFS_ITER_RECURSE || all ||
1983 	    cb.cb_version || argc))
1984 		usage(B_FALSE);
1985 	if ((all || argc) && (showversions))
1986 		usage(B_FALSE);
1987 	if (all && argc)
1988 		usage(B_FALSE);
1989 
1990 	if (showversions) {
1991 		/* Show info on available versions. */
1992 		(void) printf(gettext("The following filesystem versions are "
1993 		    "supported:\n\n"));
1994 		(void) printf(gettext("VER  DESCRIPTION\n"));
1995 		(void) printf("---  -----------------------------------------"
1996 		    "---------------\n");
1997 		(void) printf(gettext(" 1   Initial ZFS filesystem version\n"));
1998 		(void) printf(gettext(" 2   Enhanced directory entries\n"));
1999 		(void) printf(gettext(" 3   Case insensitive and filesystem "
2000 		    "user identifier (FUID)\n"));
2001 		(void) printf(gettext(" 4   userquota, groupquota "
2002 		    "properties\n"));
2003 		(void) printf(gettext(" 5   System attributes\n"));
2004 		(void) printf(gettext("\nFor more information on a particular "
2005 		    "version, including supported releases,\n"));
2006 		(void) printf("see the ZFS Administration Guide.\n\n");
2007 		ret = 0;
2008 	} else if (argc || all) {
2009 		/* Upgrade filesystems */
2010 		if (cb.cb_version == 0)
2011 			cb.cb_version = ZPL_VERSION;
2012 		ret = zfs_for_each(argc, argv, flags, ZFS_TYPE_FILESYSTEM,
2013 		    NULL, NULL, 0, upgrade_set_callback, &cb);
2014 		(void) printf(gettext("%llu filesystems upgraded\n"),
2015 		    cb.cb_numupgraded);
2016 		if (cb.cb_numsamegraded) {
2017 			(void) printf(gettext("%llu filesystems already at "
2018 			    "this version\n"),
2019 			    cb.cb_numsamegraded);
2020 		}
2021 		if (cb.cb_numfailed != 0)
2022 			ret = 1;
2023 	} else {
2024 		/* List old-version filesytems */
2025 		boolean_t found;
2026 		(void) printf(gettext("This system is currently running "
2027 		    "ZFS filesystem version %llu.\n\n"), ZPL_VERSION);
2028 
2029 		flags |= ZFS_ITER_RECURSE;
2030 		ret = zfs_for_each(0, NULL, flags, ZFS_TYPE_FILESYSTEM,
2031 		    NULL, NULL, 0, upgrade_list_callback, &cb);
2032 
2033 		found = cb.cb_foundone;
2034 		cb.cb_foundone = B_FALSE;
2035 		cb.cb_newer = B_TRUE;
2036 
2037 		ret = zfs_for_each(0, NULL, flags, ZFS_TYPE_FILESYSTEM,
2038 		    NULL, NULL, 0, upgrade_list_callback, &cb);
2039 
2040 		if (!cb.cb_foundone && !found) {
2041 			(void) printf(gettext("All filesystems are "
2042 			    "formatted with the current version.\n"));
2043 		}
2044 	}
2045 
2046 	return (ret);
2047 }
2048 
2049 /*
2050  * zfs userspace [-Hinp] [-o field[,...]] [-s field [-s field]...]
2051  *               [-S field [-S field]...] [-t type[,...]] filesystem | snapshot
2052  * zfs groupspace [-Hinp] [-o field[,...]] [-s field [-s field]...]
2053  *                [-S field [-S field]...] [-t type[,...]] filesystem | snapshot
2054  *
2055  *	-H      Scripted mode; elide headers and separate columns by tabs.
2056  *	-i	Translate SID to POSIX ID.
2057  *	-n	Print numeric ID instead of user/group name.
2058  *	-o      Control which fields to display.
2059  *	-p	Use exact (parseable) numeric output.
2060  *	-s      Specify sort columns, descending order.
2061  *	-S      Specify sort columns, ascending order.
2062  *	-t      Control which object types to display.
2063  *
2064  *	Displays space consumed by, and quotas on, each user in the specified
2065  *	filesystem or snapshot.
2066  */
2067 
2068 /* us_field_types, us_field_hdr and us_field_names should be kept in sync */
2069 enum us_field_types {
2070 	USFIELD_TYPE,
2071 	USFIELD_NAME,
2072 	USFIELD_USED,
2073 	USFIELD_QUOTA
2074 };
2075 static char *us_field_hdr[] = { "TYPE", "NAME", "USED", "QUOTA" };
2076 static char *us_field_names[] = { "type", "name", "used", "quota" };
2077 #define	USFIELD_LAST	(sizeof (us_field_names) / sizeof (char *))
2078 
2079 #define	USTYPE_PSX_GRP	(1 << 0)
2080 #define	USTYPE_PSX_USR	(1 << 1)
2081 #define	USTYPE_SMB_GRP	(1 << 2)
2082 #define	USTYPE_SMB_USR	(1 << 3)
2083 #define	USTYPE_ALL	\
2084 	(USTYPE_PSX_GRP | USTYPE_PSX_USR | USTYPE_SMB_GRP | USTYPE_SMB_USR)
2085 
2086 static int us_type_bits[] = {
2087 	USTYPE_PSX_GRP,
2088 	USTYPE_PSX_USR,
2089 	USTYPE_SMB_GRP,
2090 	USTYPE_SMB_USR,
2091 	USTYPE_ALL
2092 };
2093 static char *us_type_names[] = { "posixgroup", "posxiuser", "smbgroup",
2094 	"smbuser", "all" };
2095 
2096 typedef struct us_node {
2097 	nvlist_t	*usn_nvl;
2098 	uu_avl_node_t	usn_avlnode;
2099 	uu_list_node_t	usn_listnode;
2100 } us_node_t;
2101 
2102 typedef struct us_cbdata {
2103 	nvlist_t	**cb_nvlp;
2104 	uu_avl_pool_t	*cb_avl_pool;
2105 	uu_avl_t	*cb_avl;
2106 	boolean_t	cb_numname;
2107 	boolean_t	cb_nicenum;
2108 	boolean_t	cb_sid2posix;
2109 	zfs_userquota_prop_t cb_prop;
2110 	zfs_sort_column_t *cb_sortcol;
2111 	size_t		cb_width[USFIELD_LAST];
2112 } us_cbdata_t;
2113 
2114 static boolean_t us_populated = B_FALSE;
2115 
2116 typedef struct {
2117 	zfs_sort_column_t *si_sortcol;
2118 	boolean_t	si_numname;
2119 } us_sort_info_t;
2120 
2121 static int
2122 us_field_index(char *field)
2123 {
2124 	int i;
2125 
2126 	for (i = 0; i < USFIELD_LAST; i++) {
2127 		if (strcmp(field, us_field_names[i]) == 0)
2128 			return (i);
2129 	}
2130 
2131 	return (-1);
2132 }
2133 
2134 static int
2135 us_compare(const void *larg, const void *rarg, void *unused)
2136 {
2137 	const us_node_t *l = larg;
2138 	const us_node_t *r = rarg;
2139 	us_sort_info_t *si = (us_sort_info_t *)unused;
2140 	zfs_sort_column_t *sortcol = si->si_sortcol;
2141 	boolean_t numname = si->si_numname;
2142 	nvlist_t *lnvl = l->usn_nvl;
2143 	nvlist_t *rnvl = r->usn_nvl;
2144 	int rc = 0;
2145 	boolean_t lvb, rvb;
2146 
2147 	for (; sortcol != NULL; sortcol = sortcol->sc_next) {
2148 		char *lvstr = "";
2149 		char *rvstr = "";
2150 		uint32_t lv32 = 0;
2151 		uint32_t rv32 = 0;
2152 		uint64_t lv64 = 0;
2153 		uint64_t rv64 = 0;
2154 		zfs_prop_t prop = sortcol->sc_prop;
2155 		const char *propname = NULL;
2156 		boolean_t reverse = sortcol->sc_reverse;
2157 
2158 		switch (prop) {
2159 		case ZFS_PROP_TYPE:
2160 			propname = "type";
2161 			(void) nvlist_lookup_uint32(lnvl, propname, &lv32);
2162 			(void) nvlist_lookup_uint32(rnvl, propname, &rv32);
2163 			if (rv32 != lv32)
2164 				rc = (rv32 < lv32) ? 1 : -1;
2165 			break;
2166 		case ZFS_PROP_NAME:
2167 			propname = "name";
2168 			if (numname) {
2169 				(void) nvlist_lookup_uint64(lnvl, propname,
2170 				    &lv64);
2171 				(void) nvlist_lookup_uint64(rnvl, propname,
2172 				    &rv64);
2173 				if (rv64 != lv64)
2174 					rc = (rv64 < lv64) ? 1 : -1;
2175 			} else {
2176 				(void) nvlist_lookup_string(lnvl, propname,
2177 				    &lvstr);
2178 				(void) nvlist_lookup_string(rnvl, propname,
2179 				    &rvstr);
2180 				rc = strcmp(lvstr, rvstr);
2181 			}
2182 			break;
2183 		case ZFS_PROP_USED:
2184 		case ZFS_PROP_QUOTA:
2185 			if (!us_populated)
2186 				break;
2187 			if (prop == ZFS_PROP_USED)
2188 				propname = "used";
2189 			else
2190 				propname = "quota";
2191 			(void) nvlist_lookup_uint64(lnvl, propname, &lv64);
2192 			(void) nvlist_lookup_uint64(rnvl, propname, &rv64);
2193 			if (rv64 != lv64)
2194 				rc = (rv64 < lv64) ? 1 : -1;
2195 			break;
2196 		}
2197 
2198 		if (rc != 0) {
2199 			if (rc < 0)
2200 				return (reverse ? 1 : -1);
2201 			else
2202 				return (reverse ? -1 : 1);
2203 		}
2204 	}
2205 
2206 	/*
2207 	 * If entries still seem to be the same, check if they are of the same
2208 	 * type (smbentity is added only if we are doing SID to POSIX ID
2209 	 * translation where we can have duplicate type/name combinations).
2210 	 */
2211 	if (nvlist_lookup_boolean_value(lnvl, "smbentity", &lvb) == 0 &&
2212 	    nvlist_lookup_boolean_value(rnvl, "smbentity", &rvb) == 0 &&
2213 	    lvb != rvb)
2214 		return (lvb < rvb ? -1 : 1);
2215 
2216 	return (0);
2217 }
2218 
2219 static inline const char *
2220 us_type2str(unsigned field_type)
2221 {
2222 	switch (field_type) {
2223 	case USTYPE_PSX_USR:
2224 		return ("POSIX User");
2225 	case USTYPE_PSX_GRP:
2226 		return ("POSIX Group");
2227 	case USTYPE_SMB_USR:
2228 		return ("SMB User");
2229 	case USTYPE_SMB_GRP:
2230 		return ("SMB Group");
2231 	default:
2232 		return ("Undefined");
2233 	}
2234 }
2235 
2236 static int
2237 userspace_cb(void *arg, const char *domain, uid_t rid, uint64_t space)
2238 {
2239 	us_cbdata_t *cb = (us_cbdata_t *)arg;
2240 	zfs_userquota_prop_t prop = cb->cb_prop;
2241 	char *name = NULL;
2242 	char *propname;
2243 	char sizebuf[32];
2244 	us_node_t *node;
2245 	uu_avl_pool_t *avl_pool = cb->cb_avl_pool;
2246 	uu_avl_t *avl = cb->cb_avl;
2247 	uu_avl_index_t idx;
2248 	nvlist_t *props;
2249 	us_node_t *n;
2250 	zfs_sort_column_t *sortcol = cb->cb_sortcol;
2251 	unsigned type;
2252 	const char *typestr;
2253 	size_t namelen;
2254 	size_t typelen;
2255 	size_t sizelen;
2256 	int typeidx, nameidx, sizeidx;
2257 	us_sort_info_t sortinfo = { sortcol, cb->cb_numname };
2258 	boolean_t smbentity = B_FALSE;
2259 
2260 	if (nvlist_alloc(&props, NV_UNIQUE_NAME, 0) != 0)
2261 		nomem();
2262 	node = safe_malloc(sizeof (us_node_t));
2263 	uu_avl_node_init(node, &node->usn_avlnode, avl_pool);
2264 	node->usn_nvl = props;
2265 
2266 	if (domain != NULL && domain[0] != '\0') {
2267 		/* SMB */
2268 		char sid[ZFS_MAXNAMELEN + 32];
2269 		uid_t id;
2270 		uint64_t classes;
2271 		int err;
2272 		directory_error_t e;
2273 
2274 		smbentity = B_TRUE;
2275 
2276 		(void) snprintf(sid, sizeof (sid), "%s-%u", domain, rid);
2277 
2278 		if (prop == ZFS_PROP_GROUPUSED || prop == ZFS_PROP_GROUPQUOTA) {
2279 			type = USTYPE_SMB_GRP;
2280 			err = sid_to_id(sid, B_FALSE, &id);
2281 		} else {
2282 			type = USTYPE_SMB_USR;
2283 			err = sid_to_id(sid, B_TRUE, &id);
2284 		}
2285 
2286 		if (err == 0) {
2287 			rid = id;
2288 			if (!cb->cb_sid2posix) {
2289 				e = directory_name_from_sid(NULL, sid, &name,
2290 				    &classes);
2291 				if (e != NULL)
2292 					directory_error_free(e);
2293 				if (name == NULL)
2294 					name = sid;
2295 			}
2296 		}
2297 	}
2298 
2299 	if (cb->cb_sid2posix || domain == NULL || domain[0] == '\0') {
2300 		/* POSIX or -i */
2301 		if (prop == ZFS_PROP_GROUPUSED || prop == ZFS_PROP_GROUPQUOTA) {
2302 			type = USTYPE_PSX_GRP;
2303 			if (!cb->cb_numname) {
2304 				struct group *g;
2305 
2306 				if ((g = getgrgid(rid)) != NULL)
2307 					name = g->gr_name;
2308 			}
2309 		} else {
2310 			type = USTYPE_PSX_USR;
2311 			if (!cb->cb_numname) {
2312 				struct passwd *p;
2313 
2314 				if ((p = getpwuid(rid)) != NULL)
2315 					name = p->pw_name;
2316 			}
2317 		}
2318 	}
2319 
2320 	/*
2321 	 * Make sure that the type/name combination is unique when doing
2322 	 * SID to POSIX ID translation (hence changing the type from SMB to
2323 	 * POSIX).
2324 	 */
2325 	if (cb->cb_sid2posix &&
2326 	    nvlist_add_boolean_value(props, "smbentity", smbentity) != 0)
2327 		nomem();
2328 
2329 	/* Calculate/update width of TYPE field */
2330 	typestr = us_type2str(type);
2331 	typelen = strlen(gettext(typestr));
2332 	typeidx = us_field_index("type");
2333 	if (typelen > cb->cb_width[typeidx])
2334 		cb->cb_width[typeidx] = typelen;
2335 	if (nvlist_add_uint32(props, "type", type) != 0)
2336 		nomem();
2337 
2338 	/* Calculate/update width of NAME field */
2339 	if ((cb->cb_numname && cb->cb_sid2posix) || name == NULL) {
2340 		if (nvlist_add_uint64(props, "name", rid) != 0)
2341 			nomem();
2342 		namelen = snprintf(NULL, 0, "%u", rid);
2343 	} else {
2344 		if (nvlist_add_string(props, "name", name) != 0)
2345 			nomem();
2346 		namelen = strlen(name);
2347 	}
2348 	nameidx = us_field_index("name");
2349 	if (namelen > cb->cb_width[nameidx])
2350 		cb->cb_width[nameidx] = namelen;
2351 
2352 	/*
2353 	 * Check if this type/name combination is in the list and update it;
2354 	 * otherwise add new node to the list.
2355 	 */
2356 	if ((n = uu_avl_find(avl, node, &sortinfo, &idx)) == NULL) {
2357 		uu_avl_insert(avl, node, idx);
2358 	} else {
2359 		nvlist_free(props);
2360 		free(node);
2361 		node = n;
2362 		props = node->usn_nvl;
2363 	}
2364 
2365 	/* Calculate/update width of USED/QUOTA fields */
2366 	if (cb->cb_nicenum)
2367 		zfs_nicenum(space, sizebuf, sizeof (sizebuf));
2368 	else
2369 		(void) snprintf(sizebuf, sizeof (sizebuf), "%llu", space);
2370 	sizelen = strlen(sizebuf);
2371 	if (prop == ZFS_PROP_USERUSED || prop == ZFS_PROP_GROUPUSED) {
2372 		propname = "used";
2373 		if (!nvlist_exists(props, "quota"))
2374 			(void) nvlist_add_uint64(props, "quota", 0);
2375 	} else {
2376 		propname = "quota";
2377 		if (!nvlist_exists(props, "used"))
2378 			(void) nvlist_add_uint64(props, "used", 0);
2379 	}
2380 	sizeidx = us_field_index(propname);
2381 	if (sizelen > cb->cb_width[sizeidx])
2382 		cb->cb_width[sizeidx] = sizelen;
2383 
2384 	if (nvlist_add_uint64(props, propname, space) != 0)
2385 		nomem();
2386 
2387 	return (0);
2388 }
2389 
2390 static void
2391 print_us_node(boolean_t scripted, boolean_t parsable, int *fields, int types,
2392     size_t *width, us_node_t *node)
2393 {
2394 	nvlist_t *nvl = node->usn_nvl;
2395 	char valstr[ZFS_MAXNAMELEN];
2396 	boolean_t first = B_TRUE;
2397 	int cfield = 0;
2398 	int field;
2399 	uint32_t ustype;
2400 
2401 	/* Check type */
2402 	(void) nvlist_lookup_uint32(nvl, "type", &ustype);
2403 	if (!(ustype & types))
2404 		return;
2405 
2406 	while ((field = fields[cfield]) != USFIELD_LAST) {
2407 		nvpair_t *nvp = NULL;
2408 		data_type_t type;
2409 		uint32_t val32;
2410 		uint64_t val64;
2411 		char *strval = NULL;
2412 
2413 		while ((nvp = nvlist_next_nvpair(nvl, nvp)) != NULL) {
2414 			if (strcmp(nvpair_name(nvp),
2415 			    us_field_names[field]) == 0)
2416 				break;
2417 		}
2418 
2419 		type = nvpair_type(nvp);
2420 		switch (type) {
2421 		case DATA_TYPE_UINT32:
2422 			(void) nvpair_value_uint32(nvp, &val32);
2423 			break;
2424 		case DATA_TYPE_UINT64:
2425 			(void) nvpair_value_uint64(nvp, &val64);
2426 			break;
2427 		case DATA_TYPE_STRING:
2428 			(void) nvpair_value_string(nvp, &strval);
2429 			break;
2430 		default:
2431 			(void) fprintf(stderr, "invalid data type\n");
2432 		}
2433 
2434 		switch (field) {
2435 		case USFIELD_TYPE:
2436 			strval = (char *)us_type2str(val32);
2437 			break;
2438 		case USFIELD_NAME:
2439 			if (type == DATA_TYPE_UINT64) {
2440 				(void) sprintf(valstr, "%llu", val64);
2441 				strval = valstr;
2442 			}
2443 			break;
2444 		case USFIELD_USED:
2445 		case USFIELD_QUOTA:
2446 			if (type == DATA_TYPE_UINT64) {
2447 				if (parsable) {
2448 					(void) sprintf(valstr, "%llu", val64);
2449 				} else {
2450 					zfs_nicenum(val64, valstr,
2451 					    sizeof (valstr));
2452 				}
2453 				if (field == USFIELD_QUOTA &&
2454 				    strcmp(valstr, "0") == 0)
2455 					strval = "none";
2456 				else
2457 					strval = valstr;
2458 			}
2459 			break;
2460 		}
2461 
2462 		if (!first) {
2463 			if (scripted)
2464 				(void) printf("\t");
2465 			else
2466 				(void) printf("  ");
2467 		}
2468 		if (scripted)
2469 			(void) printf("%s", strval);
2470 		else if (field == USFIELD_TYPE || field == USFIELD_NAME)
2471 			(void) printf("%-*s", width[field], strval);
2472 		else
2473 			(void) printf("%*s", width[field], strval);
2474 
2475 		first = B_FALSE;
2476 		cfield++;
2477 	}
2478 
2479 	(void) printf("\n");
2480 }
2481 
2482 static void
2483 print_us(boolean_t scripted, boolean_t parsable, int *fields, int types,
2484     size_t *width, boolean_t rmnode, uu_avl_t *avl)
2485 {
2486 	us_node_t *node;
2487 	const char *col;
2488 	int cfield = 0;
2489 	int field;
2490 
2491 	if (!scripted) {
2492 		boolean_t first = B_TRUE;
2493 
2494 		while ((field = fields[cfield]) != USFIELD_LAST) {
2495 			col = gettext(us_field_hdr[field]);
2496 			if (field == USFIELD_TYPE || field == USFIELD_NAME) {
2497 				(void) printf(first ? "%-*s" : "  %-*s",
2498 				    width[field], col);
2499 			} else {
2500 				(void) printf(first ? "%*s" : "  %*s",
2501 				    width[field], col);
2502 			}
2503 			first = B_FALSE;
2504 			cfield++;
2505 		}
2506 		(void) printf("\n");
2507 	}
2508 
2509 	for (node = uu_avl_first(avl); node; node = uu_avl_next(avl, node)) {
2510 		print_us_node(scripted, parsable, fields, types, width, node);
2511 		if (rmnode)
2512 			nvlist_free(node->usn_nvl);
2513 	}
2514 }
2515 
2516 static int
2517 zfs_do_userspace(int argc, char **argv)
2518 {
2519 	zfs_handle_t *zhp;
2520 	zfs_userquota_prop_t p;
2521 	uu_avl_pool_t *avl_pool;
2522 	uu_avl_t *avl_tree;
2523 	uu_avl_walk_t *walk;
2524 	char *delim;
2525 	char deffields[] = "type,name,used,quota";
2526 	char *ofield = NULL;
2527 	char *tfield = NULL;
2528 	int cfield = 0;
2529 	int fields[256];
2530 	int i;
2531 	boolean_t scripted = B_FALSE;
2532 	boolean_t prtnum = B_FALSE;
2533 	boolean_t parsable = B_FALSE;
2534 	boolean_t sid2posix = B_FALSE;
2535 	int ret = 0;
2536 	int c;
2537 	zfs_sort_column_t *sortcol = NULL;
2538 	int types = USTYPE_PSX_USR | USTYPE_SMB_USR;
2539 	us_cbdata_t cb;
2540 	us_node_t *node;
2541 	us_node_t *rmnode;
2542 	uu_list_pool_t *listpool;
2543 	uu_list_t *list;
2544 	uu_avl_index_t idx = 0;
2545 	uu_list_index_t idx2 = 0;
2546 
2547 	if (argc < 2)
2548 		usage(B_FALSE);
2549 
2550 	if (strcmp(argv[0], "groupspace") == 0)
2551 		/* Toggle default group types */
2552 		types = USTYPE_PSX_GRP | USTYPE_SMB_GRP;
2553 
2554 	while ((c = getopt(argc, argv, "nHpo:s:S:t:i")) != -1) {
2555 		switch (c) {
2556 		case 'n':
2557 			prtnum = B_TRUE;
2558 			break;
2559 		case 'H':
2560 			scripted = B_TRUE;
2561 			break;
2562 		case 'p':
2563 			parsable = B_TRUE;
2564 			break;
2565 		case 'o':
2566 			ofield = optarg;
2567 			break;
2568 		case 's':
2569 		case 'S':
2570 			if (zfs_add_sort_column(&sortcol, optarg,
2571 			    c == 's' ? B_FALSE : B_TRUE) != 0) {
2572 				(void) fprintf(stderr,
2573 				    gettext("invalid field '%s'\n"), optarg);
2574 				usage(B_FALSE);
2575 			}
2576 			break;
2577 		case 't':
2578 			tfield = optarg;
2579 			break;
2580 		case 'i':
2581 			sid2posix = B_TRUE;
2582 			break;
2583 		case ':':
2584 			(void) fprintf(stderr, gettext("missing argument for "
2585 			    "'%c' option\n"), optopt);
2586 			usage(B_FALSE);
2587 			break;
2588 		case '?':
2589 			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
2590 			    optopt);
2591 			usage(B_FALSE);
2592 		}
2593 	}
2594 
2595 	argc -= optind;
2596 	argv += optind;
2597 
2598 	if (argc < 1) {
2599 		(void) fprintf(stderr, gettext("missing dataset name\n"));
2600 		usage(B_FALSE);
2601 	}
2602 	if (argc > 1) {
2603 		(void) fprintf(stderr, gettext("too many arguments\n"));
2604 		usage(B_FALSE);
2605 	}
2606 
2607 	/* Use default output fields if not specified using -o */
2608 	if (ofield == NULL)
2609 		ofield = deffields;
2610 	do {
2611 		if ((delim = strchr(ofield, ',')) != NULL)
2612 			*delim = '\0';
2613 		if ((fields[cfield++] = us_field_index(ofield)) == -1) {
2614 			(void) fprintf(stderr, gettext("invalid type '%s' "
2615 			    "for -o option\n"), ofield);
2616 			return (-1);
2617 		}
2618 		if (delim != NULL)
2619 			ofield = delim + 1;
2620 	} while (delim != NULL);
2621 	fields[cfield] = USFIELD_LAST;
2622 
2623 	/* Override output types (-t option) */
2624 	if (tfield != NULL) {
2625 		types = 0;
2626 
2627 		do {
2628 			boolean_t found = B_FALSE;
2629 
2630 			if ((delim = strchr(tfield, ',')) != NULL)
2631 				*delim = '\0';
2632 			for (i = 0; i < sizeof (us_type_bits) / sizeof (int);
2633 			    i++) {
2634 				if (strcmp(tfield, us_type_names[i]) == 0) {
2635 					found = B_TRUE;
2636 					types |= us_type_bits[i];
2637 					break;
2638 				}
2639 			}
2640 			if (!found) {
2641 				(void) fprintf(stderr, gettext("invalid type "
2642 				    "'%s' for -t option\n"), tfield);
2643 				return (-1);
2644 			}
2645 			if (delim != NULL)
2646 				tfield = delim + 1;
2647 		} while (delim != NULL);
2648 	}
2649 
2650 	if ((zhp = zfs_open(g_zfs, argv[0], ZFS_TYPE_DATASET)) == NULL)
2651 		return (1);
2652 
2653 	if ((avl_pool = uu_avl_pool_create("us_avl_pool", sizeof (us_node_t),
2654 	    offsetof(us_node_t, usn_avlnode), us_compare, UU_DEFAULT)) == NULL)
2655 		nomem();
2656 	if ((avl_tree = uu_avl_create(avl_pool, NULL, UU_DEFAULT)) == NULL)
2657 		nomem();
2658 
2659 	/* Always add default sorting columns */
2660 	(void) zfs_add_sort_column(&sortcol, "type", B_FALSE);
2661 	(void) zfs_add_sort_column(&sortcol, "name", B_FALSE);
2662 
2663 	cb.cb_sortcol = sortcol;
2664 	cb.cb_numname = prtnum;
2665 	cb.cb_nicenum = !parsable;
2666 	cb.cb_avl_pool = avl_pool;
2667 	cb.cb_avl = avl_tree;
2668 	cb.cb_sid2posix = sid2posix;
2669 
2670 	for (i = 0; i < USFIELD_LAST; i++)
2671 		cb.cb_width[i] = strlen(gettext(us_field_hdr[i]));
2672 
2673 	for (p = 0; p < ZFS_NUM_USERQUOTA_PROPS; p++) {
2674 		if (((p == ZFS_PROP_USERUSED || p == ZFS_PROP_USERQUOTA) &&
2675 		    !(types & (USTYPE_PSX_USR | USTYPE_SMB_USR))) ||
2676 		    ((p == ZFS_PROP_GROUPUSED || p == ZFS_PROP_GROUPQUOTA) &&
2677 		    !(types & (USTYPE_PSX_GRP | USTYPE_SMB_GRP))))
2678 			continue;
2679 		cb.cb_prop = p;
2680 		if ((ret = zfs_userspace(zhp, p, userspace_cb, &cb)) != 0)
2681 			return (ret);
2682 	}
2683 
2684 	/* Sort the list */
2685 	if ((node = uu_avl_first(avl_tree)) == NULL)
2686 		return (0);
2687 
2688 	us_populated = B_TRUE;
2689 
2690 	listpool = uu_list_pool_create("tmplist", sizeof (us_node_t),
2691 	    offsetof(us_node_t, usn_listnode), NULL, UU_DEFAULT);
2692 	list = uu_list_create(listpool, NULL, UU_DEFAULT);
2693 	uu_list_node_init(node, &node->usn_listnode, listpool);
2694 
2695 	while (node != NULL) {
2696 		rmnode = node;
2697 		node = uu_avl_next(avl_tree, node);
2698 		uu_avl_remove(avl_tree, rmnode);
2699 		if (uu_list_find(list, rmnode, NULL, &idx2) == NULL)
2700 			uu_list_insert(list, rmnode, idx2);
2701 	}
2702 
2703 	for (node = uu_list_first(list); node != NULL;
2704 	    node = uu_list_next(list, node)) {
2705 		us_sort_info_t sortinfo = { sortcol, cb.cb_numname };
2706 
2707 		if (uu_avl_find(avl_tree, node, &sortinfo, &idx) == NULL)
2708 			uu_avl_insert(avl_tree, node, idx);
2709 	}
2710 
2711 	uu_list_destroy(list);
2712 	uu_list_pool_destroy(listpool);
2713 
2714 	/* Print and free node nvlist memory */
2715 	print_us(scripted, parsable, fields, types, cb.cb_width, B_TRUE,
2716 	    cb.cb_avl);
2717 
2718 	zfs_free_sort_columns(sortcol);
2719 
2720 	/* Clean up the AVL tree */
2721 	if ((walk = uu_avl_walk_start(cb.cb_avl, UU_WALK_ROBUST)) == NULL)
2722 		nomem();
2723 
2724 	while ((node = uu_avl_walk_next(walk)) != NULL) {
2725 		uu_avl_remove(cb.cb_avl, node);
2726 		free(node);
2727 	}
2728 
2729 	uu_avl_walk_end(walk);
2730 	uu_avl_destroy(avl_tree);
2731 	uu_avl_pool_destroy(avl_pool);
2732 
2733 	return (ret);
2734 }
2735 
2736 /*
2737  * list [-r][-d max] [-H] [-o property[,property]...] [-t type[,type]...]
2738  *      [-s property [-s property]...] [-S property [-S property]...]
2739  *      <dataset> ...
2740  *
2741  *	-r	Recurse over all children
2742  *	-d	Limit recursion by depth.
2743  *	-H	Scripted mode; elide headers and separate columns by tabs
2744  *	-o	Control which fields to display.
2745  *	-t	Control which object types to display.
2746  *	-s	Specify sort columns, descending order.
2747  *	-S	Specify sort columns, ascending order.
2748  *
2749  * When given no arguments, lists all filesystems in the system.
2750  * Otherwise, list the specified datasets, optionally recursing down them if
2751  * '-r' is specified.
2752  */
2753 typedef struct list_cbdata {
2754 	boolean_t	cb_first;
2755 	boolean_t	cb_scripted;
2756 	zprop_list_t	*cb_proplist;
2757 } list_cbdata_t;
2758 
2759 /*
2760  * Given a list of columns to display, output appropriate headers for each one.
2761  */
2762 static void
2763 print_header(zprop_list_t *pl)
2764 {
2765 	char headerbuf[ZFS_MAXPROPLEN];
2766 	const char *header;
2767 	int i;
2768 	boolean_t first = B_TRUE;
2769 	boolean_t right_justify;
2770 
2771 	for (; pl != NULL; pl = pl->pl_next) {
2772 		if (!first) {
2773 			(void) printf("  ");
2774 		} else {
2775 			first = B_FALSE;
2776 		}
2777 
2778 		right_justify = B_FALSE;
2779 		if (pl->pl_prop != ZPROP_INVAL) {
2780 			header = zfs_prop_column_name(pl->pl_prop);
2781 			right_justify = zfs_prop_align_right(pl->pl_prop);
2782 		} else {
2783 			for (i = 0; pl->pl_user_prop[i] != '\0'; i++)
2784 				headerbuf[i] = toupper(pl->pl_user_prop[i]);
2785 			headerbuf[i] = '\0';
2786 			header = headerbuf;
2787 		}
2788 
2789 		if (pl->pl_next == NULL && !right_justify)
2790 			(void) printf("%s", header);
2791 		else if (right_justify)
2792 			(void) printf("%*s", pl->pl_width, header);
2793 		else
2794 			(void) printf("%-*s", pl->pl_width, header);
2795 	}
2796 
2797 	(void) printf("\n");
2798 }
2799 
2800 /*
2801  * Given a dataset and a list of fields, print out all the properties according
2802  * to the described layout.
2803  */
2804 static void
2805 print_dataset(zfs_handle_t *zhp, zprop_list_t *pl, boolean_t scripted)
2806 {
2807 	boolean_t first = B_TRUE;
2808 	char property[ZFS_MAXPROPLEN];
2809 	nvlist_t *userprops = zfs_get_user_props(zhp);
2810 	nvlist_t *propval;
2811 	char *propstr;
2812 	boolean_t right_justify;
2813 	int width;
2814 
2815 	for (; pl != NULL; pl = pl->pl_next) {
2816 		if (!first) {
2817 			if (scripted)
2818 				(void) printf("\t");
2819 			else
2820 				(void) printf("  ");
2821 		} else {
2822 			first = B_FALSE;
2823 		}
2824 
2825 		if (pl->pl_prop != ZPROP_INVAL) {
2826 			if (zfs_prop_get(zhp, pl->pl_prop, property,
2827 			    sizeof (property), NULL, NULL, 0, B_FALSE) != 0)
2828 				propstr = "-";
2829 			else
2830 				propstr = property;
2831 
2832 			right_justify = zfs_prop_align_right(pl->pl_prop);
2833 		} else if (zfs_prop_userquota(pl->pl_user_prop)) {
2834 			if (zfs_prop_get_userquota(zhp, pl->pl_user_prop,
2835 			    property, sizeof (property), B_FALSE) != 0)
2836 				propstr = "-";
2837 			else
2838 				propstr = property;
2839 			right_justify = B_TRUE;
2840 		} else if (zfs_prop_written(pl->pl_user_prop)) {
2841 			if (zfs_prop_get_written(zhp, pl->pl_user_prop,
2842 			    property, sizeof (property), B_FALSE) != 0)
2843 				propstr = "-";
2844 			else
2845 				propstr = property;
2846 			right_justify = B_TRUE;
2847 		} else {
2848 			if (nvlist_lookup_nvlist(userprops,
2849 			    pl->pl_user_prop, &propval) != 0)
2850 				propstr = "-";
2851 			else
2852 				verify(nvlist_lookup_string(propval,
2853 				    ZPROP_VALUE, &propstr) == 0);
2854 			right_justify = B_FALSE;
2855 		}
2856 
2857 		width = pl->pl_width;
2858 
2859 		/*
2860 		 * If this is being called in scripted mode, or if this is the
2861 		 * last column and it is left-justified, don't include a width
2862 		 * format specifier.
2863 		 */
2864 		if (scripted || (pl->pl_next == NULL && !right_justify))
2865 			(void) printf("%s", propstr);
2866 		else if (right_justify)
2867 			(void) printf("%*s", width, propstr);
2868 		else
2869 			(void) printf("%-*s", width, propstr);
2870 	}
2871 
2872 	(void) printf("\n");
2873 }
2874 
2875 /*
2876  * Generic callback function to list a dataset or snapshot.
2877  */
2878 static int
2879 list_callback(zfs_handle_t *zhp, void *data)
2880 {
2881 	list_cbdata_t *cbp = data;
2882 
2883 	if (cbp->cb_first) {
2884 		if (!cbp->cb_scripted)
2885 			print_header(cbp->cb_proplist);
2886 		cbp->cb_first = B_FALSE;
2887 	}
2888 
2889 	print_dataset(zhp, cbp->cb_proplist, cbp->cb_scripted);
2890 
2891 	return (0);
2892 }
2893 
2894 static int
2895 zfs_do_list(int argc, char **argv)
2896 {
2897 	int c;
2898 	boolean_t scripted = B_FALSE;
2899 	static char default_fields[] =
2900 	    "name,used,available,referenced,mountpoint";
2901 	int types = ZFS_TYPE_DATASET;
2902 	boolean_t types_specified = B_FALSE;
2903 	char *fields = NULL;
2904 	list_cbdata_t cb = { 0 };
2905 	char *value;
2906 	int limit = 0;
2907 	int ret = 0;
2908 	zfs_sort_column_t *sortcol = NULL;
2909 	int flags = ZFS_ITER_PROP_LISTSNAPS | ZFS_ITER_ARGS_CAN_BE_PATHS;
2910 
2911 	/* check options */
2912 	while ((c = getopt(argc, argv, ":d:o:rt:Hs:S:")) != -1) {
2913 		switch (c) {
2914 		case 'o':
2915 			fields = optarg;
2916 			break;
2917 		case 'd':
2918 			limit = parse_depth(optarg, &flags);
2919 			break;
2920 		case 'r':
2921 			flags |= ZFS_ITER_RECURSE;
2922 			break;
2923 		case 'H':
2924 			scripted = B_TRUE;
2925 			break;
2926 		case 's':
2927 			if (zfs_add_sort_column(&sortcol, optarg,
2928 			    B_FALSE) != 0) {
2929 				(void) fprintf(stderr,
2930 				    gettext("invalid property '%s'\n"), optarg);
2931 				usage(B_FALSE);
2932 			}
2933 			break;
2934 		case 'S':
2935 			if (zfs_add_sort_column(&sortcol, optarg,
2936 			    B_TRUE) != 0) {
2937 				(void) fprintf(stderr,
2938 				    gettext("invalid property '%s'\n"), optarg);
2939 				usage(B_FALSE);
2940 			}
2941 			break;
2942 		case 't':
2943 			types = 0;
2944 			types_specified = B_TRUE;
2945 			flags &= ~ZFS_ITER_PROP_LISTSNAPS;
2946 			while (*optarg != '\0') {
2947 				static char *type_subopts[] = { "filesystem",
2948 				    "volume", "snapshot", "all", NULL };
2949 
2950 				switch (getsubopt(&optarg, type_subopts,
2951 				    &value)) {
2952 				case 0:
2953 					types |= ZFS_TYPE_FILESYSTEM;
2954 					break;
2955 				case 1:
2956 					types |= ZFS_TYPE_VOLUME;
2957 					break;
2958 				case 2:
2959 					types |= ZFS_TYPE_SNAPSHOT;
2960 					break;
2961 				case 3:
2962 					types = ZFS_TYPE_DATASET;
2963 					break;
2964 
2965 				default:
2966 					(void) fprintf(stderr,
2967 					    gettext("invalid type '%s'\n"),
2968 					    value);
2969 					usage(B_FALSE);
2970 				}
2971 			}
2972 			break;
2973 		case ':':
2974 			(void) fprintf(stderr, gettext("missing argument for "
2975 			    "'%c' option\n"), optopt);
2976 			usage(B_FALSE);
2977 			break;
2978 		case '?':
2979 			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
2980 			    optopt);
2981 			usage(B_FALSE);
2982 		}
2983 	}
2984 
2985 	argc -= optind;
2986 	argv += optind;
2987 
2988 	if (fields == NULL)
2989 		fields = default_fields;
2990 
2991 	/*
2992 	 * If "-o space" and no types were specified, don't display snapshots.
2993 	 */
2994 	if (strcmp(fields, "space") == 0 && types_specified == B_FALSE)
2995 		types &= ~ZFS_TYPE_SNAPSHOT;
2996 
2997 	/*
2998 	 * If the user specifies '-o all', the zprop_get_list() doesn't
2999 	 * normally include the name of the dataset.  For 'zfs list', we always
3000 	 * want this property to be first.
3001 	 */
3002 	if (zprop_get_list(g_zfs, fields, &cb.cb_proplist, ZFS_TYPE_DATASET)
3003 	    != 0)
3004 		usage(B_FALSE);
3005 
3006 	cb.cb_scripted = scripted;
3007 	cb.cb_first = B_TRUE;
3008 
3009 	ret = zfs_for_each(argc, argv, flags, types, sortcol, &cb.cb_proplist,
3010 	    limit, list_callback, &cb);
3011 
3012 	zprop_free_list(cb.cb_proplist);
3013 	zfs_free_sort_columns(sortcol);
3014 
3015 	if (ret == 0 && cb.cb_first && !cb.cb_scripted)
3016 		(void) printf(gettext("no datasets available\n"));
3017 
3018 	return (ret);
3019 }
3020 
3021 /*
3022  * zfs rename [-f] <fs | snap | vol> <fs | snap | vol>
3023  * zfs rename [-f] -p <fs | vol> <fs | vol>
3024  * zfs rename -r <snap> <snap>
3025  *
3026  * Renames the given dataset to another of the same type.
3027  *
3028  * The '-p' flag creates all the non-existing ancestors of the target first.
3029  */
3030 /* ARGSUSED */
3031 static int
3032 zfs_do_rename(int argc, char **argv)
3033 {
3034 	zfs_handle_t *zhp;
3035 	int c;
3036 	int ret = 0;
3037 	boolean_t recurse = B_FALSE;
3038 	boolean_t parents = B_FALSE;
3039 	boolean_t force_unmount = B_FALSE;
3040 
3041 	/* check options */
3042 	while ((c = getopt(argc, argv, "prf")) != -1) {
3043 		switch (c) {
3044 		case 'p':
3045 			parents = B_TRUE;
3046 			break;
3047 		case 'r':
3048 			recurse = B_TRUE;
3049 			break;
3050 		case 'f':
3051 			force_unmount = B_TRUE;
3052 			break;
3053 		case '?':
3054 		default:
3055 			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
3056 			    optopt);
3057 			usage(B_FALSE);
3058 		}
3059 	}
3060 
3061 	argc -= optind;
3062 	argv += optind;
3063 
3064 	/* check number of arguments */
3065 	if (argc < 1) {
3066 		(void) fprintf(stderr, gettext("missing source dataset "
3067 		    "argument\n"));
3068 		usage(B_FALSE);
3069 	}
3070 	if (argc < 2) {
3071 		(void) fprintf(stderr, gettext("missing target dataset "
3072 		    "argument\n"));
3073 		usage(B_FALSE);
3074 	}
3075 	if (argc > 2) {
3076 		(void) fprintf(stderr, gettext("too many arguments\n"));
3077 		usage(B_FALSE);
3078 	}
3079 
3080 	if (recurse && parents) {
3081 		(void) fprintf(stderr, gettext("-p and -r options are mutually "
3082 		    "exclusive\n"));
3083 		usage(B_FALSE);
3084 	}
3085 
3086 	if (recurse && strchr(argv[0], '@') == 0) {
3087 		(void) fprintf(stderr, gettext("source dataset for recursive "
3088 		    "rename must be a snapshot\n"));
3089 		usage(B_FALSE);
3090 	}
3091 
3092 	if ((zhp = zfs_open(g_zfs, argv[0], parents ? ZFS_TYPE_FILESYSTEM |
3093 	    ZFS_TYPE_VOLUME : ZFS_TYPE_DATASET)) == NULL)
3094 		return (1);
3095 
3096 	/* If we were asked and the name looks good, try to create ancestors. */
3097 	if (parents && zfs_name_valid(argv[1], zfs_get_type(zhp)) &&
3098 	    zfs_create_ancestors(g_zfs, argv[1]) != 0) {
3099 		zfs_close(zhp);
3100 		return (1);
3101 	}
3102 
3103 	ret = (zfs_rename(zhp, argv[1], recurse, force_unmount) != 0);
3104 
3105 	zfs_close(zhp);
3106 	return (ret);
3107 }
3108 
3109 /*
3110  * zfs promote <fs>
3111  *
3112  * Promotes the given clone fs to be the parent
3113  */
3114 /* ARGSUSED */
3115 static int
3116 zfs_do_promote(int argc, char **argv)
3117 {
3118 	zfs_handle_t *zhp;
3119 	int ret = 0;
3120 
3121 	/* check options */
3122 	if (argc > 1 && argv[1][0] == '-') {
3123 		(void) fprintf(stderr, gettext("invalid option '%c'\n"),
3124 		    argv[1][1]);
3125 		usage(B_FALSE);
3126 	}
3127 
3128 	/* check number of arguments */
3129 	if (argc < 2) {
3130 		(void) fprintf(stderr, gettext("missing clone filesystem"
3131 		    " argument\n"));
3132 		usage(B_FALSE);
3133 	}
3134 	if (argc > 2) {
3135 		(void) fprintf(stderr, gettext("too many arguments\n"));
3136 		usage(B_FALSE);
3137 	}
3138 
3139 	zhp = zfs_open(g_zfs, argv[1], ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME);
3140 	if (zhp == NULL)
3141 		return (1);
3142 
3143 	ret = (zfs_promote(zhp) != 0);
3144 
3145 
3146 	zfs_close(zhp);
3147 	return (ret);
3148 }
3149 
3150 /*
3151  * zfs rollback [-rRf] <snapshot>
3152  *
3153  *	-r	Delete any intervening snapshots before doing rollback
3154  *	-R	Delete any snapshots and their clones
3155  *	-f	ignored for backwards compatability
3156  *
3157  * Given a filesystem, rollback to a specific snapshot, discarding any changes
3158  * since then and making it the active dataset.  If more recent snapshots exist,
3159  * the command will complain unless the '-r' flag is given.
3160  */
3161 typedef struct rollback_cbdata {
3162 	uint64_t	cb_create;
3163 	boolean_t	cb_first;
3164 	int		cb_doclones;
3165 	char		*cb_target;
3166 	int		cb_error;
3167 	boolean_t	cb_recurse;
3168 	boolean_t	cb_dependent;
3169 } rollback_cbdata_t;
3170 
3171 /*
3172  * Report any snapshots more recent than the one specified.  Used when '-r' is
3173  * not specified.  We reuse this same callback for the snapshot dependents - if
3174  * 'cb_dependent' is set, then this is a dependent and we should report it
3175  * without checking the transaction group.
3176  */
3177 static int
3178 rollback_check(zfs_handle_t *zhp, void *data)
3179 {
3180 	rollback_cbdata_t *cbp = data;
3181 
3182 	if (cbp->cb_doclones) {
3183 		zfs_close(zhp);
3184 		return (0);
3185 	}
3186 
3187 	if (!cbp->cb_dependent) {
3188 		if (strcmp(zfs_get_name(zhp), cbp->cb_target) != 0 &&
3189 		    zfs_get_type(zhp) == ZFS_TYPE_SNAPSHOT &&
3190 		    zfs_prop_get_int(zhp, ZFS_PROP_CREATETXG) >
3191 		    cbp->cb_create) {
3192 
3193 			if (cbp->cb_first && !cbp->cb_recurse) {
3194 				(void) fprintf(stderr, gettext("cannot "
3195 				    "rollback to '%s': more recent snapshots "
3196 				    "exist\n"),
3197 				    cbp->cb_target);
3198 				(void) fprintf(stderr, gettext("use '-r' to "
3199 				    "force deletion of the following "
3200 				    "snapshots:\n"));
3201 				cbp->cb_first = 0;
3202 				cbp->cb_error = 1;
3203 			}
3204 
3205 			if (cbp->cb_recurse) {
3206 				cbp->cb_dependent = B_TRUE;
3207 				if (zfs_iter_dependents(zhp, B_TRUE,
3208 				    rollback_check, cbp) != 0) {
3209 					zfs_close(zhp);
3210 					return (-1);
3211 				}
3212 				cbp->cb_dependent = B_FALSE;
3213 			} else {
3214 				(void) fprintf(stderr, "%s\n",
3215 				    zfs_get_name(zhp));
3216 			}
3217 		}
3218 	} else {
3219 		if (cbp->cb_first && cbp->cb_recurse) {
3220 			(void) fprintf(stderr, gettext("cannot rollback to "
3221 			    "'%s': clones of previous snapshots exist\n"),
3222 			    cbp->cb_target);
3223 			(void) fprintf(stderr, gettext("use '-R' to "
3224 			    "force deletion of the following clones and "
3225 			    "dependents:\n"));
3226 			cbp->cb_first = 0;
3227 			cbp->cb_error = 1;
3228 		}
3229 
3230 		(void) fprintf(stderr, "%s\n", zfs_get_name(zhp));
3231 	}
3232 
3233 	zfs_close(zhp);
3234 	return (0);
3235 }
3236 
3237 static int
3238 zfs_do_rollback(int argc, char **argv)
3239 {
3240 	int ret = 0;
3241 	int c;
3242 	boolean_t force = B_FALSE;
3243 	rollback_cbdata_t cb = { 0 };
3244 	zfs_handle_t *zhp, *snap;
3245 	char parentname[ZFS_MAXNAMELEN];
3246 	char *delim;
3247 
3248 	/* check options */
3249 	while ((c = getopt(argc, argv, "rRf")) != -1) {
3250 		switch (c) {
3251 		case 'r':
3252 			cb.cb_recurse = 1;
3253 			break;
3254 		case 'R':
3255 			cb.cb_recurse = 1;
3256 			cb.cb_doclones = 1;
3257 			break;
3258 		case 'f':
3259 			force = B_TRUE;
3260 			break;
3261 		case '?':
3262 			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
3263 			    optopt);
3264 			usage(B_FALSE);
3265 		}
3266 	}
3267 
3268 	argc -= optind;
3269 	argv += optind;
3270 
3271 	/* check number of arguments */
3272 	if (argc < 1) {
3273 		(void) fprintf(stderr, gettext("missing dataset argument\n"));
3274 		usage(B_FALSE);
3275 	}
3276 	if (argc > 1) {
3277 		(void) fprintf(stderr, gettext("too many arguments\n"));
3278 		usage(B_FALSE);
3279 	}
3280 
3281 	/* open the snapshot */
3282 	if ((snap = zfs_open(g_zfs, argv[0], ZFS_TYPE_SNAPSHOT)) == NULL)
3283 		return (1);
3284 
3285 	/* open the parent dataset */
3286 	(void) strlcpy(parentname, argv[0], sizeof (parentname));
3287 	verify((delim = strrchr(parentname, '@')) != NULL);
3288 	*delim = '\0';
3289 	if ((zhp = zfs_open(g_zfs, parentname, ZFS_TYPE_DATASET)) == NULL) {
3290 		zfs_close(snap);
3291 		return (1);
3292 	}
3293 
3294 	/*
3295 	 * Check for more recent snapshots and/or clones based on the presence
3296 	 * of '-r' and '-R'.
3297 	 */
3298 	cb.cb_target = argv[0];
3299 	cb.cb_create = zfs_prop_get_int(snap, ZFS_PROP_CREATETXG);
3300 	cb.cb_first = B_TRUE;
3301 	cb.cb_error = 0;
3302 	if ((ret = zfs_iter_children(zhp, rollback_check, &cb)) != 0)
3303 		goto out;
3304 
3305 	if ((ret = cb.cb_error) != 0)
3306 		goto out;
3307 
3308 	/*
3309 	 * Rollback parent to the given snapshot.
3310 	 */
3311 	ret = zfs_rollback(zhp, snap, force);
3312 
3313 out:
3314 	zfs_close(snap);
3315 	zfs_close(zhp);
3316 
3317 	if (ret == 0)
3318 		return (0);
3319 	else
3320 		return (1);
3321 }
3322 
3323 /*
3324  * zfs set property=value { fs | snap | vol } ...
3325  *
3326  * Sets the given property for all datasets specified on the command line.
3327  */
3328 typedef struct set_cbdata {
3329 	char		*cb_propname;
3330 	char		*cb_value;
3331 } set_cbdata_t;
3332 
3333 static int
3334 set_callback(zfs_handle_t *zhp, void *data)
3335 {
3336 	set_cbdata_t *cbp = data;
3337 
3338 	if (zfs_prop_set(zhp, cbp->cb_propname, cbp->cb_value) != 0) {
3339 		switch (libzfs_errno(g_zfs)) {
3340 		case EZFS_MOUNTFAILED:
3341 			(void) fprintf(stderr, gettext("property may be set "
3342 			    "but unable to remount filesystem\n"));
3343 			break;
3344 		case EZFS_SHARENFSFAILED:
3345 			(void) fprintf(stderr, gettext("property may be set "
3346 			    "but unable to reshare filesystem\n"));
3347 			break;
3348 		}
3349 		return (1);
3350 	}
3351 	return (0);
3352 }
3353 
3354 static int
3355 zfs_do_set(int argc, char **argv)
3356 {
3357 	set_cbdata_t cb;
3358 	int ret = 0;
3359 
3360 	/* check for options */
3361 	if (argc > 1 && argv[1][0] == '-') {
3362 		(void) fprintf(stderr, gettext("invalid option '%c'\n"),
3363 		    argv[1][1]);
3364 		usage(B_FALSE);
3365 	}
3366 
3367 	/* check number of arguments */
3368 	if (argc < 2) {
3369 		(void) fprintf(stderr, gettext("missing property=value "
3370 		    "argument\n"));
3371 		usage(B_FALSE);
3372 	}
3373 	if (argc < 3) {
3374 		(void) fprintf(stderr, gettext("missing dataset name\n"));
3375 		usage(B_FALSE);
3376 	}
3377 
3378 	/* validate property=value argument */
3379 	cb.cb_propname = argv[1];
3380 	if (((cb.cb_value = strchr(cb.cb_propname, '=')) == NULL) ||
3381 	    (cb.cb_value[1] == '\0')) {
3382 		(void) fprintf(stderr, gettext("missing value in "
3383 		    "property=value argument\n"));
3384 		usage(B_FALSE);
3385 	}
3386 
3387 	*cb.cb_value = '\0';
3388 	cb.cb_value++;
3389 
3390 	if (*cb.cb_propname == '\0') {
3391 		(void) fprintf(stderr,
3392 		    gettext("missing property in property=value argument\n"));
3393 		usage(B_FALSE);
3394 	}
3395 
3396 	ret = zfs_for_each(argc - 2, argv + 2, NULL,
3397 	    ZFS_TYPE_DATASET, NULL, NULL, 0, set_callback, &cb);
3398 
3399 	return (ret);
3400 }
3401 
3402 typedef struct snap_cbdata {
3403 	nvlist_t *sd_nvl;
3404 	boolean_t sd_recursive;
3405 	const char *sd_snapname;
3406 } snap_cbdata_t;
3407 
3408 static int
3409 zfs_snapshot_cb(zfs_handle_t *zhp, void *arg)
3410 {
3411 	snap_cbdata_t *sd = arg;
3412 	char *name;
3413 	int rv = 0;
3414 	int error;
3415 
3416 	error = asprintf(&name, "%s@%s", zfs_get_name(zhp), sd->sd_snapname);
3417 	if (error == -1)
3418 		nomem();
3419 	fnvlist_add_boolean(sd->sd_nvl, name);
3420 	free(name);
3421 
3422 	if (sd->sd_recursive)
3423 		rv = zfs_iter_filesystems(zhp, zfs_snapshot_cb, sd);
3424 	zfs_close(zhp);
3425 	return (rv);
3426 }
3427 
3428 /*
3429  * zfs snapshot [-r] [-o prop=value] ... <fs@snap>
3430  *
3431  * Creates a snapshot with the given name.  While functionally equivalent to
3432  * 'zfs create', it is a separate command to differentiate intent.
3433  */
3434 static int
3435 zfs_do_snapshot(int argc, char **argv)
3436 {
3437 	int ret = 0;
3438 	char c;
3439 	nvlist_t *props;
3440 	snap_cbdata_t sd = { 0 };
3441 	boolean_t multiple_snaps = B_FALSE;
3442 
3443 	if (nvlist_alloc(&props, NV_UNIQUE_NAME, 0) != 0)
3444 		nomem();
3445 	if (nvlist_alloc(&sd.sd_nvl, NV_UNIQUE_NAME, 0) != 0)
3446 		nomem();
3447 
3448 	/* check options */
3449 	while ((c = getopt(argc, argv, "ro:")) != -1) {
3450 		switch (c) {
3451 		case 'o':
3452 			if (parseprop(props))
3453 				return (1);
3454 			break;
3455 		case 'r':
3456 			sd.sd_recursive = B_TRUE;
3457 			multiple_snaps = B_TRUE;
3458 			break;
3459 		case '?':
3460 			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
3461 			    optopt);
3462 			goto usage;
3463 		}
3464 	}
3465 
3466 	argc -= optind;
3467 	argv += optind;
3468 
3469 	/* check number of arguments */
3470 	if (argc < 1) {
3471 		(void) fprintf(stderr, gettext("missing snapshot argument\n"));
3472 		goto usage;
3473 	}
3474 
3475 	if (argc > 1)
3476 		multiple_snaps = B_TRUE;
3477 	for (; argc > 0; argc--, argv++) {
3478 		char *atp;
3479 		zfs_handle_t *zhp;
3480 
3481 		atp = strchr(argv[0], '@');
3482 		if (atp == NULL)
3483 			goto usage;
3484 		*atp = '\0';
3485 		sd.sd_snapname = atp + 1;
3486 		zhp = zfs_open(g_zfs, argv[0],
3487 		    ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME);
3488 		if (zhp == NULL)
3489 			goto usage;
3490 		if (zfs_snapshot_cb(zhp, &sd) != 0)
3491 			goto usage;
3492 	}
3493 
3494 	ret = zfs_snapshot_nvl(g_zfs, sd.sd_nvl, props);
3495 	nvlist_free(sd.sd_nvl);
3496 	nvlist_free(props);
3497 	if (ret != 0 && multiple_snaps)
3498 		(void) fprintf(stderr, gettext("no snapshots were created\n"));
3499 	return (ret != 0);
3500 
3501 usage:
3502 	nvlist_free(sd.sd_nvl);
3503 	nvlist_free(props);
3504 	usage(B_FALSE);
3505 	return (-1);
3506 }
3507 
3508 /*
3509  * Send a backup stream to stdout.
3510  */
3511 static int
3512 zfs_do_send(int argc, char **argv)
3513 {
3514 	char *fromname = NULL;
3515 	char *toname = NULL;
3516 	char *cp;
3517 	zfs_handle_t *zhp;
3518 	sendflags_t flags = { 0 };
3519 	int c, err;
3520 	nvlist_t *dbgnv = NULL;
3521 	boolean_t extraverbose = B_FALSE;
3522 
3523 	/* check options */
3524 	while ((c = getopt(argc, argv, ":i:I:RDpvnP")) != -1) {
3525 		switch (c) {
3526 		case 'i':
3527 			if (fromname)
3528 				usage(B_FALSE);
3529 			fromname = optarg;
3530 			break;
3531 		case 'I':
3532 			if (fromname)
3533 				usage(B_FALSE);
3534 			fromname = optarg;
3535 			flags.doall = B_TRUE;
3536 			break;
3537 		case 'R':
3538 			flags.replicate = B_TRUE;
3539 			break;
3540 		case 'p':
3541 			flags.props = B_TRUE;
3542 			break;
3543 		case 'P':
3544 			flags.parsable = B_TRUE;
3545 			flags.verbose = B_TRUE;
3546 			break;
3547 		case 'v':
3548 			if (flags.verbose)
3549 				extraverbose = B_TRUE;
3550 			flags.verbose = B_TRUE;
3551 			flags.progress = B_TRUE;
3552 			break;
3553 		case 'D':
3554 			flags.dedup = B_TRUE;
3555 			break;
3556 		case 'n':
3557 			flags.dryrun = B_TRUE;
3558 			break;
3559 		case ':':
3560 			(void) fprintf(stderr, gettext("missing argument for "
3561 			    "'%c' option\n"), optopt);
3562 			usage(B_FALSE);
3563 			break;
3564 		case '?':
3565 			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
3566 			    optopt);
3567 			usage(B_FALSE);
3568 		}
3569 	}
3570 
3571 	argc -= optind;
3572 	argv += optind;
3573 
3574 	/* check number of arguments */
3575 	if (argc < 1) {
3576 		(void) fprintf(stderr, gettext("missing snapshot argument\n"));
3577 		usage(B_FALSE);
3578 	}
3579 	if (argc > 1) {
3580 		(void) fprintf(stderr, gettext("too many arguments\n"));
3581 		usage(B_FALSE);
3582 	}
3583 
3584 	if (!flags.dryrun && isatty(STDOUT_FILENO)) {
3585 		(void) fprintf(stderr,
3586 		    gettext("Error: Stream can not be written to a terminal.\n"
3587 		    "You must redirect standard output.\n"));
3588 		return (1);
3589 	}
3590 
3591 	cp = strchr(argv[0], '@');
3592 	if (cp == NULL) {
3593 		(void) fprintf(stderr,
3594 		    gettext("argument must be a snapshot\n"));
3595 		usage(B_FALSE);
3596 	}
3597 	*cp = '\0';
3598 	toname = cp + 1;
3599 	zhp = zfs_open(g_zfs, argv[0], ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME);
3600 	if (zhp == NULL)
3601 		return (1);
3602 
3603 	/*
3604 	 * If they specified the full path to the snapshot, chop off
3605 	 * everything except the short name of the snapshot, but special
3606 	 * case if they specify the origin.
3607 	 */
3608 	if (fromname && (cp = strchr(fromname, '@')) != NULL) {
3609 		char origin[ZFS_MAXNAMELEN];
3610 		zprop_source_t src;
3611 
3612 		(void) zfs_prop_get(zhp, ZFS_PROP_ORIGIN,
3613 		    origin, sizeof (origin), &src, NULL, 0, B_FALSE);
3614 
3615 		if (strcmp(origin, fromname) == 0) {
3616 			fromname = NULL;
3617 			flags.fromorigin = B_TRUE;
3618 		} else {
3619 			*cp = '\0';
3620 			if (cp != fromname && strcmp(argv[0], fromname)) {
3621 				(void) fprintf(stderr,
3622 				    gettext("incremental source must be "
3623 				    "in same filesystem\n"));
3624 				usage(B_FALSE);
3625 			}
3626 			fromname = cp + 1;
3627 			if (strchr(fromname, '@') || strchr(fromname, '/')) {
3628 				(void) fprintf(stderr,
3629 				    gettext("invalid incremental source\n"));
3630 				usage(B_FALSE);
3631 			}
3632 		}
3633 	}
3634 
3635 	if (flags.replicate && fromname == NULL)
3636 		flags.doall = B_TRUE;
3637 
3638 	err = zfs_send(zhp, fromname, toname, &flags, STDOUT_FILENO, NULL, 0,
3639 	    extraverbose ? &dbgnv : NULL);
3640 
3641 	if (extraverbose && dbgnv != NULL) {
3642 		/*
3643 		 * dump_nvlist prints to stdout, but that's been
3644 		 * redirected to a file.  Make it print to stderr
3645 		 * instead.
3646 		 */
3647 		(void) dup2(STDERR_FILENO, STDOUT_FILENO);
3648 		dump_nvlist(dbgnv, 0);
3649 		nvlist_free(dbgnv);
3650 	}
3651 	zfs_close(zhp);
3652 
3653 	return (err != 0);
3654 }
3655 
3656 /*
3657  * zfs receive [-vnFu] [-d | -e] <fs@snap>
3658  *
3659  * Restore a backup stream from stdin.
3660  */
3661 static int
3662 zfs_do_receive(int argc, char **argv)
3663 {
3664 	int c, err;
3665 	recvflags_t flags = { 0 };
3666 
3667 	/* check options */
3668 	while ((c = getopt(argc, argv, ":denuvF")) != -1) {
3669 		switch (c) {
3670 		case 'd':
3671 			flags.isprefix = B_TRUE;
3672 			break;
3673 		case 'e':
3674 			flags.isprefix = B_TRUE;
3675 			flags.istail = B_TRUE;
3676 			break;
3677 		case 'n':
3678 			flags.dryrun = B_TRUE;
3679 			break;
3680 		case 'u':
3681 			flags.nomount = B_TRUE;
3682 			break;
3683 		case 'v':
3684 			flags.verbose = B_TRUE;
3685 			break;
3686 		case 'F':
3687 			flags.force = B_TRUE;
3688 			break;
3689 		case ':':
3690 			(void) fprintf(stderr, gettext("missing argument for "
3691 			    "'%c' option\n"), optopt);
3692 			usage(B_FALSE);
3693 			break;
3694 		case '?':
3695 			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
3696 			    optopt);
3697 			usage(B_FALSE);
3698 		}
3699 	}
3700 
3701 	argc -= optind;
3702 	argv += optind;
3703 
3704 	/* check number of arguments */
3705 	if (argc < 1) {
3706 		(void) fprintf(stderr, gettext("missing snapshot argument\n"));
3707 		usage(B_FALSE);
3708 	}
3709 	if (argc > 1) {
3710 		(void) fprintf(stderr, gettext("too many arguments\n"));
3711 		usage(B_FALSE);
3712 	}
3713 
3714 	if (isatty(STDIN_FILENO)) {
3715 		(void) fprintf(stderr,
3716 		    gettext("Error: Backup stream can not be read "
3717 		    "from a terminal.\n"
3718 		    "You must redirect standard input.\n"));
3719 		return (1);
3720 	}
3721 
3722 	err = zfs_receive(g_zfs, argv[0], &flags, STDIN_FILENO, NULL);
3723 
3724 	return (err != 0);
3725 }
3726 
3727 /*
3728  * allow/unallow stuff
3729  */
3730 /* copied from zfs/sys/dsl_deleg.h */
3731 #define	ZFS_DELEG_PERM_CREATE		"create"
3732 #define	ZFS_DELEG_PERM_DESTROY		"destroy"
3733 #define	ZFS_DELEG_PERM_SNAPSHOT		"snapshot"
3734 #define	ZFS_DELEG_PERM_ROLLBACK		"rollback"
3735 #define	ZFS_DELEG_PERM_CLONE		"clone"
3736 #define	ZFS_DELEG_PERM_PROMOTE		"promote"
3737 #define	ZFS_DELEG_PERM_RENAME		"rename"
3738 #define	ZFS_DELEG_PERM_MOUNT		"mount"
3739 #define	ZFS_DELEG_PERM_SHARE		"share"
3740 #define	ZFS_DELEG_PERM_SEND		"send"
3741 #define	ZFS_DELEG_PERM_RECEIVE		"receive"
3742 #define	ZFS_DELEG_PERM_ALLOW		"allow"
3743 #define	ZFS_DELEG_PERM_USERPROP		"userprop"
3744 #define	ZFS_DELEG_PERM_VSCAN		"vscan" /* ??? */
3745 #define	ZFS_DELEG_PERM_USERQUOTA	"userquota"
3746 #define	ZFS_DELEG_PERM_GROUPQUOTA	"groupquota"
3747 #define	ZFS_DELEG_PERM_USERUSED		"userused"
3748 #define	ZFS_DELEG_PERM_GROUPUSED	"groupused"
3749 #define	ZFS_DELEG_PERM_HOLD		"hold"
3750 #define	ZFS_DELEG_PERM_RELEASE		"release"
3751 #define	ZFS_DELEG_PERM_DIFF		"diff"
3752 
3753 #define	ZFS_NUM_DELEG_NOTES ZFS_DELEG_NOTE_NONE
3754 
3755 static zfs_deleg_perm_tab_t zfs_deleg_perm_tbl[] = {
3756 	{ ZFS_DELEG_PERM_ALLOW, ZFS_DELEG_NOTE_ALLOW },
3757 	{ ZFS_DELEG_PERM_CLONE, ZFS_DELEG_NOTE_CLONE },
3758 	{ ZFS_DELEG_PERM_CREATE, ZFS_DELEG_NOTE_CREATE },
3759 	{ ZFS_DELEG_PERM_DESTROY, ZFS_DELEG_NOTE_DESTROY },
3760 	{ ZFS_DELEG_PERM_DIFF, ZFS_DELEG_NOTE_DIFF},
3761 	{ ZFS_DELEG_PERM_HOLD, ZFS_DELEG_NOTE_HOLD },
3762 	{ ZFS_DELEG_PERM_MOUNT, ZFS_DELEG_NOTE_MOUNT },
3763 	{ ZFS_DELEG_PERM_PROMOTE, ZFS_DELEG_NOTE_PROMOTE },
3764 	{ ZFS_DELEG_PERM_RECEIVE, ZFS_DELEG_NOTE_RECEIVE },
3765 	{ ZFS_DELEG_PERM_RELEASE, ZFS_DELEG_NOTE_RELEASE },
3766 	{ ZFS_DELEG_PERM_RENAME, ZFS_DELEG_NOTE_RENAME },
3767 	{ ZFS_DELEG_PERM_ROLLBACK, ZFS_DELEG_NOTE_ROLLBACK },
3768 	{ ZFS_DELEG_PERM_SEND, ZFS_DELEG_NOTE_SEND },
3769 	{ ZFS_DELEG_PERM_SHARE, ZFS_DELEG_NOTE_SHARE },
3770 	{ ZFS_DELEG_PERM_SNAPSHOT, ZFS_DELEG_NOTE_SNAPSHOT },
3771 
3772 	{ ZFS_DELEG_PERM_GROUPQUOTA, ZFS_DELEG_NOTE_GROUPQUOTA },
3773 	{ ZFS_DELEG_PERM_GROUPUSED, ZFS_DELEG_NOTE_GROUPUSED },
3774 	{ ZFS_DELEG_PERM_USERPROP, ZFS_DELEG_NOTE_USERPROP },
3775 	{ ZFS_DELEG_PERM_USERQUOTA, ZFS_DELEG_NOTE_USERQUOTA },
3776 	{ ZFS_DELEG_PERM_USERUSED, ZFS_DELEG_NOTE_USERUSED },
3777 	{ NULL, ZFS_DELEG_NOTE_NONE }
3778 };
3779 
3780 /* permission structure */
3781 typedef struct deleg_perm {
3782 	zfs_deleg_who_type_t	dp_who_type;
3783 	const char		*dp_name;
3784 	boolean_t		dp_local;
3785 	boolean_t		dp_descend;
3786 } deleg_perm_t;
3787 
3788 /* */
3789 typedef struct deleg_perm_node {
3790 	deleg_perm_t		dpn_perm;
3791 
3792 	uu_avl_node_t		dpn_avl_node;
3793 } deleg_perm_node_t;
3794 
3795 typedef struct fs_perm fs_perm_t;
3796 
3797 /* permissions set */
3798 typedef struct who_perm {
3799 	zfs_deleg_who_type_t	who_type;
3800 	const char		*who_name;		/* id */
3801 	char			who_ug_name[256];	/* user/group name */
3802 	fs_perm_t		*who_fsperm;		/* uplink */
3803 
3804 	uu_avl_t		*who_deleg_perm_avl;	/* permissions */
3805 } who_perm_t;
3806 
3807 /* */
3808 typedef struct who_perm_node {
3809 	who_perm_t	who_perm;
3810 	uu_avl_node_t	who_avl_node;
3811 } who_perm_node_t;
3812 
3813 typedef struct fs_perm_set fs_perm_set_t;
3814 /* fs permissions */
3815 struct fs_perm {
3816 	const char		*fsp_name;
3817 
3818 	uu_avl_t		*fsp_sc_avl;	/* sets,create */
3819 	uu_avl_t		*fsp_uge_avl;	/* user,group,everyone */
3820 
3821 	fs_perm_set_t		*fsp_set;	/* uplink */
3822 };
3823 
3824 /* */
3825 typedef struct fs_perm_node {
3826 	fs_perm_t	fspn_fsperm;
3827 	uu_avl_t	*fspn_avl;
3828 
3829 	uu_list_node_t	fspn_list_node;
3830 } fs_perm_node_t;
3831 
3832 /* top level structure */
3833 struct fs_perm_set {
3834 	uu_list_pool_t	*fsps_list_pool;
3835 	uu_list_t	*fsps_list; /* list of fs_perms */
3836 
3837 	uu_avl_pool_t	*fsps_named_set_avl_pool;
3838 	uu_avl_pool_t	*fsps_who_perm_avl_pool;
3839 	uu_avl_pool_t	*fsps_deleg_perm_avl_pool;
3840 };
3841 
3842 static inline const char *
3843 deleg_perm_type(zfs_deleg_note_t note)
3844 {
3845 	/* subcommands */
3846 	switch (note) {
3847 		/* SUBCOMMANDS */
3848 		/* OTHER */
3849 	case ZFS_DELEG_NOTE_GROUPQUOTA:
3850 	case ZFS_DELEG_NOTE_GROUPUSED:
3851 	case ZFS_DELEG_NOTE_USERPROP:
3852 	case ZFS_DELEG_NOTE_USERQUOTA:
3853 	case ZFS_DELEG_NOTE_USERUSED:
3854 		/* other */
3855 		return (gettext("other"));
3856 	default:
3857 		return (gettext("subcommand"));
3858 	}
3859 }
3860 
3861 static int inline
3862 who_type2weight(zfs_deleg_who_type_t who_type)
3863 {
3864 	int res;
3865 	switch (who_type) {
3866 		case ZFS_DELEG_NAMED_SET_SETS:
3867 		case ZFS_DELEG_NAMED_SET:
3868 			res = 0;
3869 			break;
3870 		case ZFS_DELEG_CREATE_SETS:
3871 		case ZFS_DELEG_CREATE:
3872 			res = 1;
3873 			break;
3874 		case ZFS_DELEG_USER_SETS:
3875 		case ZFS_DELEG_USER:
3876 			res = 2;
3877 			break;
3878 		case ZFS_DELEG_GROUP_SETS:
3879 		case ZFS_DELEG_GROUP:
3880 			res = 3;
3881 			break;
3882 		case ZFS_DELEG_EVERYONE_SETS:
3883 		case ZFS_DELEG_EVERYONE:
3884 			res = 4;
3885 			break;
3886 		default:
3887 			res = -1;
3888 	}
3889 
3890 	return (res);
3891 }
3892 
3893 /* ARGSUSED */
3894 static int
3895 who_perm_compare(const void *larg, const void *rarg, void *unused)
3896 {
3897 	const who_perm_node_t *l = larg;
3898 	const who_perm_node_t *r = rarg;
3899 	zfs_deleg_who_type_t ltype = l->who_perm.who_type;
3900 	zfs_deleg_who_type_t rtype = r->who_perm.who_type;
3901 	int lweight = who_type2weight(ltype);
3902 	int rweight = who_type2weight(rtype);
3903 	int res = lweight - rweight;
3904 	if (res == 0)
3905 		res = strncmp(l->who_perm.who_name, r->who_perm.who_name,
3906 		    ZFS_MAX_DELEG_NAME-1);
3907 
3908 	if (res == 0)
3909 		return (0);
3910 	if (res > 0)
3911 		return (1);
3912 	else
3913 		return (-1);
3914 }
3915 
3916 /* ARGSUSED */
3917 static int
3918 deleg_perm_compare(const void *larg, const void *rarg, void *unused)
3919 {
3920 	const deleg_perm_node_t *l = larg;
3921 	const deleg_perm_node_t *r = rarg;
3922 	int res =  strncmp(l->dpn_perm.dp_name, r->dpn_perm.dp_name,
3923 	    ZFS_MAX_DELEG_NAME-1);
3924 
3925 	if (res == 0)
3926 		return (0);
3927 
3928 	if (res > 0)
3929 		return (1);
3930 	else
3931 		return (-1);
3932 }
3933 
3934 static inline void
3935 fs_perm_set_init(fs_perm_set_t *fspset)
3936 {
3937 	bzero(fspset, sizeof (fs_perm_set_t));
3938 
3939 	if ((fspset->fsps_list_pool = uu_list_pool_create("fsps_list_pool",
3940 	    sizeof (fs_perm_node_t), offsetof(fs_perm_node_t, fspn_list_node),
3941 	    NULL, UU_DEFAULT)) == NULL)
3942 		nomem();
3943 	if ((fspset->fsps_list = uu_list_create(fspset->fsps_list_pool, NULL,
3944 	    UU_DEFAULT)) == NULL)
3945 		nomem();
3946 
3947 	if ((fspset->fsps_named_set_avl_pool = uu_avl_pool_create(
3948 	    "named_set_avl_pool", sizeof (who_perm_node_t), offsetof(
3949 	    who_perm_node_t, who_avl_node), who_perm_compare,
3950 	    UU_DEFAULT)) == NULL)
3951 		nomem();
3952 
3953 	if ((fspset->fsps_who_perm_avl_pool = uu_avl_pool_create(
3954 	    "who_perm_avl_pool", sizeof (who_perm_node_t), offsetof(
3955 	    who_perm_node_t, who_avl_node), who_perm_compare,
3956 	    UU_DEFAULT)) == NULL)
3957 		nomem();
3958 
3959 	if ((fspset->fsps_deleg_perm_avl_pool = uu_avl_pool_create(
3960 	    "deleg_perm_avl_pool", sizeof (deleg_perm_node_t), offsetof(
3961 	    deleg_perm_node_t, dpn_avl_node), deleg_perm_compare, UU_DEFAULT))
3962 	    == NULL)
3963 		nomem();
3964 }
3965 
3966 static inline void fs_perm_fini(fs_perm_t *);
3967 static inline void who_perm_fini(who_perm_t *);
3968 
3969 static inline void
3970 fs_perm_set_fini(fs_perm_set_t *fspset)
3971 {
3972 	fs_perm_node_t *node = uu_list_first(fspset->fsps_list);
3973 
3974 	while (node != NULL) {
3975 		fs_perm_node_t *next_node =
3976 		    uu_list_next(fspset->fsps_list, node);
3977 		fs_perm_t *fsperm = &node->fspn_fsperm;
3978 		fs_perm_fini(fsperm);
3979 		uu_list_remove(fspset->fsps_list, node);
3980 		free(node);
3981 		node = next_node;
3982 	}
3983 
3984 	uu_avl_pool_destroy(fspset->fsps_named_set_avl_pool);
3985 	uu_avl_pool_destroy(fspset->fsps_who_perm_avl_pool);
3986 	uu_avl_pool_destroy(fspset->fsps_deleg_perm_avl_pool);
3987 }
3988 
3989 static inline void
3990 deleg_perm_init(deleg_perm_t *deleg_perm, zfs_deleg_who_type_t type,
3991     const char *name)
3992 {
3993 	deleg_perm->dp_who_type = type;
3994 	deleg_perm->dp_name = name;
3995 }
3996 
3997 static inline void
3998 who_perm_init(who_perm_t *who_perm, fs_perm_t *fsperm,
3999     zfs_deleg_who_type_t type, const char *name)
4000 {
4001 	uu_avl_pool_t	*pool;
4002 	pool = fsperm->fsp_set->fsps_deleg_perm_avl_pool;
4003 
4004 	bzero(who_perm, sizeof (who_perm_t));
4005 
4006 	if ((who_perm->who_deleg_perm_avl = uu_avl_create(pool, NULL,
4007 	    UU_DEFAULT)) == NULL)
4008 		nomem();
4009 
4010 	who_perm->who_type = type;
4011 	who_perm->who_name = name;
4012 	who_perm->who_fsperm = fsperm;
4013 }
4014 
4015 static inline void
4016 who_perm_fini(who_perm_t *who_perm)
4017 {
4018 	deleg_perm_node_t *node = uu_avl_first(who_perm->who_deleg_perm_avl);
4019 
4020 	while (node != NULL) {
4021 		deleg_perm_node_t *next_node =
4022 		    uu_avl_next(who_perm->who_deleg_perm_avl, node);
4023 
4024 		uu_avl_remove(who_perm->who_deleg_perm_avl, node);
4025 		free(node);
4026 		node = next_node;
4027 	}
4028 
4029 	uu_avl_destroy(who_perm->who_deleg_perm_avl);
4030 }
4031 
4032 static inline void
4033 fs_perm_init(fs_perm_t *fsperm, fs_perm_set_t *fspset, const char *fsname)
4034 {
4035 	uu_avl_pool_t	*nset_pool = fspset->fsps_named_set_avl_pool;
4036 	uu_avl_pool_t	*who_pool = fspset->fsps_who_perm_avl_pool;
4037 
4038 	bzero(fsperm, sizeof (fs_perm_t));
4039 
4040 	if ((fsperm->fsp_sc_avl = uu_avl_create(nset_pool, NULL, UU_DEFAULT))
4041 	    == NULL)
4042 		nomem();
4043 
4044 	if ((fsperm->fsp_uge_avl = uu_avl_create(who_pool, NULL, UU_DEFAULT))
4045 	    == NULL)
4046 		nomem();
4047 
4048 	fsperm->fsp_set = fspset;
4049 	fsperm->fsp_name = fsname;
4050 }
4051 
4052 static inline void
4053 fs_perm_fini(fs_perm_t *fsperm)
4054 {
4055 	who_perm_node_t *node = uu_avl_first(fsperm->fsp_sc_avl);
4056 	while (node != NULL) {
4057 		who_perm_node_t *next_node = uu_avl_next(fsperm->fsp_sc_avl,
4058 		    node);
4059 		who_perm_t *who_perm = &node->who_perm;
4060 		who_perm_fini(who_perm);
4061 		uu_avl_remove(fsperm->fsp_sc_avl, node);
4062 		free(node);
4063 		node = next_node;
4064 	}
4065 
4066 	node = uu_avl_first(fsperm->fsp_uge_avl);
4067 	while (node != NULL) {
4068 		who_perm_node_t *next_node = uu_avl_next(fsperm->fsp_uge_avl,
4069 		    node);
4070 		who_perm_t *who_perm = &node->who_perm;
4071 		who_perm_fini(who_perm);
4072 		uu_avl_remove(fsperm->fsp_uge_avl, node);
4073 		free(node);
4074 		node = next_node;
4075 	}
4076 
4077 	uu_avl_destroy(fsperm->fsp_sc_avl);
4078 	uu_avl_destroy(fsperm->fsp_uge_avl);
4079 }
4080 
4081 static void inline
4082 set_deleg_perm_node(uu_avl_t *avl, deleg_perm_node_t *node,
4083     zfs_deleg_who_type_t who_type, const char *name, char locality)
4084 {
4085 	uu_avl_index_t idx = 0;
4086 
4087 	deleg_perm_node_t *found_node = NULL;
4088 	deleg_perm_t	*deleg_perm = &node->dpn_perm;
4089 
4090 	deleg_perm_init(deleg_perm, who_type, name);
4091 
4092 	if ((found_node = uu_avl_find(avl, node, NULL, &idx))
4093 	    == NULL)
4094 		uu_avl_insert(avl, node, idx);
4095 	else {
4096 		node = found_node;
4097 		deleg_perm = &node->dpn_perm;
4098 	}
4099 
4100 
4101 	switch (locality) {
4102 	case ZFS_DELEG_LOCAL:
4103 		deleg_perm->dp_local = B_TRUE;
4104 		break;
4105 	case ZFS_DELEG_DESCENDENT:
4106 		deleg_perm->dp_descend = B_TRUE;
4107 		break;
4108 	case ZFS_DELEG_NA:
4109 		break;
4110 	default:
4111 		assert(B_FALSE); /* invalid locality */
4112 	}
4113 }
4114 
4115 static inline int
4116 parse_who_perm(who_perm_t *who_perm, nvlist_t *nvl, char locality)
4117 {
4118 	nvpair_t *nvp = NULL;
4119 	fs_perm_set_t *fspset = who_perm->who_fsperm->fsp_set;
4120 	uu_avl_t *avl = who_perm->who_deleg_perm_avl;
4121 	zfs_deleg_who_type_t who_type = who_perm->who_type;
4122 
4123 	while ((nvp = nvlist_next_nvpair(nvl, nvp)) != NULL) {
4124 		const char *name = nvpair_name(nvp);
4125 		data_type_t type = nvpair_type(nvp);
4126 		uu_avl_pool_t *avl_pool = fspset->fsps_deleg_perm_avl_pool;
4127 		deleg_perm_node_t *node =
4128 		    safe_malloc(sizeof (deleg_perm_node_t));
4129 
4130 		assert(type == DATA_TYPE_BOOLEAN);
4131 
4132 		uu_avl_node_init(node, &node->dpn_avl_node, avl_pool);
4133 		set_deleg_perm_node(avl, node, who_type, name, locality);
4134 	}
4135 
4136 	return (0);
4137 }
4138 
4139 static inline int
4140 parse_fs_perm(fs_perm_t *fsperm, nvlist_t *nvl)
4141 {
4142 	nvpair_t *nvp = NULL;
4143 	fs_perm_set_t *fspset = fsperm->fsp_set;
4144 
4145 	while ((nvp = nvlist_next_nvpair(nvl, nvp)) != NULL) {
4146 		nvlist_t *nvl2 = NULL;
4147 		const char *name = nvpair_name(nvp);
4148 		uu_avl_t *avl = NULL;
4149 		uu_avl_pool_t *avl_pool;
4150 		zfs_deleg_who_type_t perm_type = name[0];
4151 		char perm_locality = name[1];
4152 		const char *perm_name = name + 3;
4153 		boolean_t is_set = B_TRUE;
4154 		who_perm_t *who_perm = NULL;
4155 
4156 		assert('$' == name[2]);
4157 
4158 		if (nvpair_value_nvlist(nvp, &nvl2) != 0)
4159 			return (-1);
4160 
4161 		switch (perm_type) {
4162 		case ZFS_DELEG_CREATE:
4163 		case ZFS_DELEG_CREATE_SETS:
4164 		case ZFS_DELEG_NAMED_SET:
4165 		case ZFS_DELEG_NAMED_SET_SETS:
4166 			avl_pool = fspset->fsps_named_set_avl_pool;
4167 			avl = fsperm->fsp_sc_avl;
4168 			break;
4169 		case ZFS_DELEG_USER:
4170 		case ZFS_DELEG_USER_SETS:
4171 		case ZFS_DELEG_GROUP:
4172 		case ZFS_DELEG_GROUP_SETS:
4173 		case ZFS_DELEG_EVERYONE:
4174 		case ZFS_DELEG_EVERYONE_SETS:
4175 			avl_pool = fspset->fsps_who_perm_avl_pool;
4176 			avl = fsperm->fsp_uge_avl;
4177 			break;
4178 		}
4179 
4180 		if (is_set) {
4181 			who_perm_node_t *found_node = NULL;
4182 			who_perm_node_t *node = safe_malloc(
4183 			    sizeof (who_perm_node_t));
4184 			who_perm = &node->who_perm;
4185 			uu_avl_index_t idx = 0;
4186 
4187 			uu_avl_node_init(node, &node->who_avl_node, avl_pool);
4188 			who_perm_init(who_perm, fsperm, perm_type, perm_name);
4189 
4190 			if ((found_node = uu_avl_find(avl, node, NULL, &idx))
4191 			    == NULL) {
4192 				if (avl == fsperm->fsp_uge_avl) {
4193 					uid_t rid = 0;
4194 					struct passwd *p = NULL;
4195 					struct group *g = NULL;
4196 					const char *nice_name = NULL;
4197 
4198 					switch (perm_type) {
4199 					case ZFS_DELEG_USER_SETS:
4200 					case ZFS_DELEG_USER:
4201 						rid = atoi(perm_name);
4202 						p = getpwuid(rid);
4203 						if (p)
4204 							nice_name = p->pw_name;
4205 						break;
4206 					case ZFS_DELEG_GROUP_SETS:
4207 					case ZFS_DELEG_GROUP:
4208 						rid = atoi(perm_name);
4209 						g = getgrgid(rid);
4210 						if (g)
4211 							nice_name = g->gr_name;
4212 						break;
4213 					}
4214 
4215 					if (nice_name != NULL)
4216 						(void) strlcpy(
4217 						    node->who_perm.who_ug_name,
4218 						    nice_name, 256);
4219 				}
4220 
4221 				uu_avl_insert(avl, node, idx);
4222 			} else {
4223 				node = found_node;
4224 				who_perm = &node->who_perm;
4225 			}
4226 		}
4227 
4228 		(void) parse_who_perm(who_perm, nvl2, perm_locality);
4229 	}
4230 
4231 	return (0);
4232 }
4233 
4234 static inline int
4235 parse_fs_perm_set(fs_perm_set_t *fspset, nvlist_t *nvl)
4236 {
4237 	nvpair_t *nvp = NULL;
4238 	uu_avl_index_t idx = 0;
4239 
4240 	while ((nvp = nvlist_next_nvpair(nvl, nvp)) != NULL) {
4241 		nvlist_t *nvl2 = NULL;
4242 		const char *fsname = nvpair_name(nvp);
4243 		data_type_t type = nvpair_type(nvp);
4244 		fs_perm_t *fsperm = NULL;
4245 		fs_perm_node_t *node = safe_malloc(sizeof (fs_perm_node_t));
4246 		if (node == NULL)
4247 			nomem();
4248 
4249 		fsperm = &node->fspn_fsperm;
4250 
4251 		assert(DATA_TYPE_NVLIST == type);
4252 
4253 		uu_list_node_init(node, &node->fspn_list_node,
4254 		    fspset->fsps_list_pool);
4255 
4256 		idx = uu_list_numnodes(fspset->fsps_list);
4257 		fs_perm_init(fsperm, fspset, fsname);
4258 
4259 		if (nvpair_value_nvlist(nvp, &nvl2) != 0)
4260 			return (-1);
4261 
4262 		(void) parse_fs_perm(fsperm, nvl2);
4263 
4264 		uu_list_insert(fspset->fsps_list, node, idx);
4265 	}
4266 
4267 	return (0);
4268 }
4269 
4270 static inline const char *
4271 deleg_perm_comment(zfs_deleg_note_t note)
4272 {
4273 	const char *str = "";
4274 
4275 	/* subcommands */
4276 	switch (note) {
4277 		/* SUBCOMMANDS */
4278 	case ZFS_DELEG_NOTE_ALLOW:
4279 		str = gettext("Must also have the permission that is being"
4280 		    "\n\t\t\t\tallowed");
4281 		break;
4282 	case ZFS_DELEG_NOTE_CLONE:
4283 		str = gettext("Must also have the 'create' ability and 'mount'"
4284 		    "\n\t\t\t\tability in the origin file system");
4285 		break;
4286 	case ZFS_DELEG_NOTE_CREATE:
4287 		str = gettext("Must also have the 'mount' ability");
4288 		break;
4289 	case ZFS_DELEG_NOTE_DESTROY:
4290 		str = gettext("Must also have the 'mount' ability");
4291 		break;
4292 	case ZFS_DELEG_NOTE_DIFF:
4293 		str = gettext("Allows lookup of paths within a dataset;"
4294 		    "\n\t\t\t\tgiven an object number. Ordinary users need this"
4295 		    "\n\t\t\t\tin order to use zfs diff");
4296 		break;
4297 	case ZFS_DELEG_NOTE_HOLD:
4298 		str = gettext("Allows adding a user hold to a snapshot");
4299 		break;
4300 	case ZFS_DELEG_NOTE_MOUNT:
4301 		str = gettext("Allows mount/umount of ZFS datasets");
4302 		break;
4303 	case ZFS_DELEG_NOTE_PROMOTE:
4304 		str = gettext("Must also have the 'mount'\n\t\t\t\tand"
4305 		    " 'promote' ability in the origin file system");
4306 		break;
4307 	case ZFS_DELEG_NOTE_RECEIVE:
4308 		str = gettext("Must also have the 'mount' and 'create'"
4309 		    " ability");
4310 		break;
4311 	case ZFS_DELEG_NOTE_RELEASE:
4312 		str = gettext("Allows releasing a user hold which\n\t\t\t\t"
4313 		    "might destroy the snapshot");
4314 		break;
4315 	case ZFS_DELEG_NOTE_RENAME:
4316 		str = gettext("Must also have the 'mount' and 'create'"
4317 		    "\n\t\t\t\tability in the new parent");
4318 		break;
4319 	case ZFS_DELEG_NOTE_ROLLBACK:
4320 		str = gettext("");
4321 		break;
4322 	case ZFS_DELEG_NOTE_SEND:
4323 		str = gettext("");
4324 		break;
4325 	case ZFS_DELEG_NOTE_SHARE:
4326 		str = gettext("Allows sharing file systems over NFS or SMB"
4327 		    "\n\t\t\t\tprotocols");
4328 		break;
4329 	case ZFS_DELEG_NOTE_SNAPSHOT:
4330 		str = gettext("");
4331 		break;
4332 /*
4333  *	case ZFS_DELEG_NOTE_VSCAN:
4334  *		str = gettext("");
4335  *		break;
4336  */
4337 		/* OTHER */
4338 	case ZFS_DELEG_NOTE_GROUPQUOTA:
4339 		str = gettext("Allows accessing any groupquota@... property");
4340 		break;
4341 	case ZFS_DELEG_NOTE_GROUPUSED:
4342 		str = gettext("Allows reading any groupused@... property");
4343 		break;
4344 	case ZFS_DELEG_NOTE_USERPROP:
4345 		str = gettext("Allows changing any user property");
4346 		break;
4347 	case ZFS_DELEG_NOTE_USERQUOTA:
4348 		str = gettext("Allows accessing any userquota@... property");
4349 		break;
4350 	case ZFS_DELEG_NOTE_USERUSED:
4351 		str = gettext("Allows reading any userused@... property");
4352 		break;
4353 		/* other */
4354 	default:
4355 		str = "";
4356 	}
4357 
4358 	return (str);
4359 }
4360 
4361 struct allow_opts {
4362 	boolean_t local;
4363 	boolean_t descend;
4364 	boolean_t user;
4365 	boolean_t group;
4366 	boolean_t everyone;
4367 	boolean_t create;
4368 	boolean_t set;
4369 	boolean_t recursive; /* unallow only */
4370 	boolean_t prt_usage;
4371 
4372 	boolean_t prt_perms;
4373 	char *who;
4374 	char *perms;
4375 	const char *dataset;
4376 };
4377 
4378 static inline int
4379 prop_cmp(const void *a, const void *b)
4380 {
4381 	const char *str1 = *(const char **)a;
4382 	const char *str2 = *(const char **)b;
4383 	return (strcmp(str1, str2));
4384 }
4385 
4386 static void
4387 allow_usage(boolean_t un, boolean_t requested, const char *msg)
4388 {
4389 	const char *opt_desc[] = {
4390 		"-h", gettext("show this help message and exit"),
4391 		"-l", gettext("set permission locally"),
4392 		"-d", gettext("set permission for descents"),
4393 		"-u", gettext("set permission for user"),
4394 		"-g", gettext("set permission for group"),
4395 		"-e", gettext("set permission for everyone"),
4396 		"-c", gettext("set create time permission"),
4397 		"-s", gettext("define permission set"),
4398 		/* unallow only */
4399 		"-r", gettext("remove permissions recursively"),
4400 	};
4401 	size_t unallow_size = sizeof (opt_desc) / sizeof (char *);
4402 	size_t allow_size = unallow_size - 2;
4403 	const char *props[ZFS_NUM_PROPS];
4404 	int i;
4405 	size_t count = 0;
4406 	FILE *fp = requested ? stdout : stderr;
4407 	zprop_desc_t *pdtbl = zfs_prop_get_table();
4408 	const char *fmt = gettext("%-16s %-14s\t%s\n");
4409 
4410 	(void) fprintf(fp, gettext("Usage: %s\n"), get_usage(un ? HELP_UNALLOW :
4411 	    HELP_ALLOW));
4412 	(void) fprintf(fp, gettext("Options:\n"));
4413 	for (int i = 0; i < (un ? unallow_size : allow_size); i++) {
4414 		const char *opt = opt_desc[i++];
4415 		const char *optdsc = opt_desc[i];
4416 		(void) fprintf(fp, gettext("  %-10s  %s\n"), opt, optdsc);
4417 	}
4418 
4419 	(void) fprintf(fp, gettext("\nThe following permissions are "
4420 	    "supported:\n\n"));
4421 	(void) fprintf(fp, fmt, gettext("NAME"), gettext("TYPE"),
4422 	    gettext("NOTES"));
4423 	for (i = 0; i < ZFS_NUM_DELEG_NOTES; i++) {
4424 		const char *perm_name = zfs_deleg_perm_tbl[i].z_perm;
4425 		zfs_deleg_note_t perm_note = zfs_deleg_perm_tbl[i].z_note;
4426 		const char *perm_type = deleg_perm_type(perm_note);
4427 		const char *perm_comment = deleg_perm_comment(perm_note);
4428 		(void) fprintf(fp, fmt, perm_name, perm_type, perm_comment);
4429 	}
4430 
4431 	for (i = 0; i < ZFS_NUM_PROPS; i++) {
4432 		zprop_desc_t *pd = &pdtbl[i];
4433 		if (pd->pd_visible != B_TRUE)
4434 			continue;
4435 
4436 		if (pd->pd_attr == PROP_READONLY)
4437 			continue;
4438 
4439 		props[count++] = pd->pd_name;
4440 	}
4441 	props[count] = NULL;
4442 
4443 	qsort(props, count, sizeof (char *), prop_cmp);
4444 
4445 	for (i = 0; i < count; i++)
4446 		(void) fprintf(fp, fmt, props[i], gettext("property"), "");
4447 
4448 	if (msg != NULL)
4449 		(void) fprintf(fp, gettext("\nzfs: error: %s"), msg);
4450 
4451 	exit(requested ? 0 : 2);
4452 }
4453 
4454 static inline const char *
4455 munge_args(int argc, char **argv, boolean_t un, size_t expected_argc,
4456     char **permsp)
4457 {
4458 	if (un && argc == expected_argc - 1)
4459 		*permsp = NULL;
4460 	else if (argc == expected_argc)
4461 		*permsp = argv[argc - 2];
4462 	else
4463 		allow_usage(un, B_FALSE,
4464 		    gettext("wrong number of parameters\n"));
4465 
4466 	return (argv[argc - 1]);
4467 }
4468 
4469 static void
4470 parse_allow_args(int argc, char **argv, boolean_t un, struct allow_opts *opts)
4471 {
4472 	int uge_sum = opts->user + opts->group + opts->everyone;
4473 	int csuge_sum = opts->create + opts->set + uge_sum;
4474 	int ldcsuge_sum = csuge_sum + opts->local + opts->descend;
4475 	int all_sum = un ? ldcsuge_sum + opts->recursive : ldcsuge_sum;
4476 
4477 	if (uge_sum > 1)
4478 		allow_usage(un, B_FALSE,
4479 		    gettext("-u, -g, and -e are mutually exclusive\n"));
4480 
4481 	if (opts->prt_usage)
4482 		if (argc == 0 && all_sum == 0)
4483 			allow_usage(un, B_TRUE, NULL);
4484 		else
4485 			usage(B_FALSE);
4486 
4487 	if (opts->set) {
4488 		if (csuge_sum > 1)
4489 			allow_usage(un, B_FALSE,
4490 			    gettext("invalid options combined with -s\n"));
4491 
4492 		opts->dataset = munge_args(argc, argv, un, 3, &opts->perms);
4493 		if (argv[0][0] != '@')
4494 			allow_usage(un, B_FALSE,
4495 			    gettext("invalid set name: missing '@' prefix\n"));
4496 		opts->who = argv[0];
4497 	} else if (opts->create) {
4498 		if (ldcsuge_sum > 1)
4499 			allow_usage(un, B_FALSE,
4500 			    gettext("invalid options combined with -c\n"));
4501 		opts->dataset = munge_args(argc, argv, un, 2, &opts->perms);
4502 	} else if (opts->everyone) {
4503 		if (csuge_sum > 1)
4504 			allow_usage(un, B_FALSE,
4505 			    gettext("invalid options combined with -e\n"));
4506 		opts->dataset = munge_args(argc, argv, un, 2, &opts->perms);
4507 	} else if (uge_sum == 0 && argc > 0 && strcmp(argv[0], "everyone")
4508 	    == 0) {
4509 		opts->everyone = B_TRUE;
4510 		argc--;
4511 		argv++;
4512 		opts->dataset = munge_args(argc, argv, un, 2, &opts->perms);
4513 	} else if (argc == 1 && !un) {
4514 		opts->prt_perms = B_TRUE;
4515 		opts->dataset = argv[argc-1];
4516 	} else {
4517 		opts->dataset = munge_args(argc, argv, un, 3, &opts->perms);
4518 		opts->who = argv[0];
4519 	}
4520 
4521 	if (!opts->local && !opts->descend) {
4522 		opts->local = B_TRUE;
4523 		opts->descend = B_TRUE;
4524 	}
4525 }
4526 
4527 static void
4528 store_allow_perm(zfs_deleg_who_type_t type, boolean_t local, boolean_t descend,
4529     const char *who, char *perms, nvlist_t *top_nvl)
4530 {
4531 	int i;
4532 	char ld[2] = { '\0', '\0' };
4533 	char who_buf[ZFS_MAXNAMELEN+32];
4534 	char base_type;
4535 	char set_type;
4536 	nvlist_t *base_nvl = NULL;
4537 	nvlist_t *set_nvl = NULL;
4538 	nvlist_t *nvl;
4539 
4540 	if (nvlist_alloc(&base_nvl, NV_UNIQUE_NAME, 0) != 0)
4541 		nomem();
4542 	if (nvlist_alloc(&set_nvl, NV_UNIQUE_NAME, 0) !=  0)
4543 		nomem();
4544 
4545 	switch (type) {
4546 	case ZFS_DELEG_NAMED_SET_SETS:
4547 	case ZFS_DELEG_NAMED_SET:
4548 		set_type = ZFS_DELEG_NAMED_SET_SETS;
4549 		base_type = ZFS_DELEG_NAMED_SET;
4550 		ld[0] = ZFS_DELEG_NA;
4551 		break;
4552 	case ZFS_DELEG_CREATE_SETS:
4553 	case ZFS_DELEG_CREATE:
4554 		set_type = ZFS_DELEG_CREATE_SETS;
4555 		base_type = ZFS_DELEG_CREATE;
4556 		ld[0] = ZFS_DELEG_NA;
4557 		break;
4558 	case ZFS_DELEG_USER_SETS:
4559 	case ZFS_DELEG_USER:
4560 		set_type = ZFS_DELEG_USER_SETS;
4561 		base_type = ZFS_DELEG_USER;
4562 		if (local)
4563 			ld[0] = ZFS_DELEG_LOCAL;
4564 		if (descend)
4565 			ld[1] = ZFS_DELEG_DESCENDENT;
4566 		break;
4567 	case ZFS_DELEG_GROUP_SETS:
4568 	case ZFS_DELEG_GROUP:
4569 		set_type = ZFS_DELEG_GROUP_SETS;
4570 		base_type = ZFS_DELEG_GROUP;
4571 		if (local)
4572 			ld[0] = ZFS_DELEG_LOCAL;
4573 		if (descend)
4574 			ld[1] = ZFS_DELEG_DESCENDENT;
4575 		break;
4576 	case ZFS_DELEG_EVERYONE_SETS:
4577 	case ZFS_DELEG_EVERYONE:
4578 		set_type = ZFS_DELEG_EVERYONE_SETS;
4579 		base_type = ZFS_DELEG_EVERYONE;
4580 		if (local)
4581 			ld[0] = ZFS_DELEG_LOCAL;
4582 		if (descend)
4583 			ld[1] = ZFS_DELEG_DESCENDENT;
4584 	}
4585 
4586 	if (perms != NULL) {
4587 		char *curr = perms;
4588 		char *end = curr + strlen(perms);
4589 
4590 		while (curr < end) {
4591 			char *delim = strchr(curr, ',');
4592 			if (delim == NULL)
4593 				delim = end;
4594 			else
4595 				*delim = '\0';
4596 
4597 			if (curr[0] == '@')
4598 				nvl = set_nvl;
4599 			else
4600 				nvl = base_nvl;
4601 
4602 			(void) nvlist_add_boolean(nvl, curr);
4603 			if (delim != end)
4604 				*delim = ',';
4605 			curr = delim + 1;
4606 		}
4607 
4608 		for (i = 0; i < 2; i++) {
4609 			char locality = ld[i];
4610 			if (locality == 0)
4611 				continue;
4612 
4613 			if (!nvlist_empty(base_nvl)) {
4614 				if (who != NULL)
4615 					(void) snprintf(who_buf,
4616 					    sizeof (who_buf), "%c%c$%s",
4617 					    base_type, locality, who);
4618 				else
4619 					(void) snprintf(who_buf,
4620 					    sizeof (who_buf), "%c%c$",
4621 					    base_type, locality);
4622 
4623 				(void) nvlist_add_nvlist(top_nvl, who_buf,
4624 				    base_nvl);
4625 			}
4626 
4627 
4628 			if (!nvlist_empty(set_nvl)) {
4629 				if (who != NULL)
4630 					(void) snprintf(who_buf,
4631 					    sizeof (who_buf), "%c%c$%s",
4632 					    set_type, locality, who);
4633 				else
4634 					(void) snprintf(who_buf,
4635 					    sizeof (who_buf), "%c%c$",
4636 					    set_type, locality);
4637 
4638 				(void) nvlist_add_nvlist(top_nvl, who_buf,
4639 				    set_nvl);
4640 			}
4641 		}
4642 	} else {
4643 		for (i = 0; i < 2; i++) {
4644 			char locality = ld[i];
4645 			if (locality == 0)
4646 				continue;
4647 
4648 			if (who != NULL)
4649 				(void) snprintf(who_buf, sizeof (who_buf),
4650 				    "%c%c$%s", base_type, locality, who);
4651 			else
4652 				(void) snprintf(who_buf, sizeof (who_buf),
4653 				    "%c%c$", base_type, locality);
4654 			(void) nvlist_add_boolean(top_nvl, who_buf);
4655 
4656 			if (who != NULL)
4657 				(void) snprintf(who_buf, sizeof (who_buf),
4658 				    "%c%c$%s", set_type, locality, who);
4659 			else
4660 				(void) snprintf(who_buf, sizeof (who_buf),
4661 				    "%c%c$", set_type, locality);
4662 			(void) nvlist_add_boolean(top_nvl, who_buf);
4663 		}
4664 	}
4665 }
4666 
4667 static int
4668 construct_fsacl_list(boolean_t un, struct allow_opts *opts, nvlist_t **nvlp)
4669 {
4670 	if (nvlist_alloc(nvlp, NV_UNIQUE_NAME, 0) != 0)
4671 		nomem();
4672 
4673 	if (opts->set) {
4674 		store_allow_perm(ZFS_DELEG_NAMED_SET, opts->local,
4675 		    opts->descend, opts->who, opts->perms, *nvlp);
4676 	} else if (opts->create) {
4677 		store_allow_perm(ZFS_DELEG_CREATE, opts->local,
4678 		    opts->descend, NULL, opts->perms, *nvlp);
4679 	} else if (opts->everyone) {
4680 		store_allow_perm(ZFS_DELEG_EVERYONE, opts->local,
4681 		    opts->descend, NULL, opts->perms, *nvlp);
4682 	} else {
4683 		char *curr = opts->who;
4684 		char *end = curr + strlen(curr);
4685 
4686 		while (curr < end) {
4687 			const char *who;
4688 			zfs_deleg_who_type_t who_type;
4689 			char *endch;
4690 			char *delim = strchr(curr, ',');
4691 			char errbuf[256];
4692 			char id[64];
4693 			struct passwd *p = NULL;
4694 			struct group *g = NULL;
4695 
4696 			uid_t rid;
4697 			if (delim == NULL)
4698 				delim = end;
4699 			else
4700 				*delim = '\0';
4701 
4702 			rid = (uid_t)strtol(curr, &endch, 0);
4703 			if (opts->user) {
4704 				who_type = ZFS_DELEG_USER;
4705 				if (*endch != '\0')
4706 					p = getpwnam(curr);
4707 				else
4708 					p = getpwuid(rid);
4709 
4710 				if (p != NULL)
4711 					rid = p->pw_uid;
4712 				else {
4713 					(void) snprintf(errbuf, 256, gettext(
4714 					    "invalid user %s"), curr);
4715 					allow_usage(un, B_TRUE, errbuf);
4716 				}
4717 			} else if (opts->group) {
4718 				who_type = ZFS_DELEG_GROUP;
4719 				if (*endch != '\0')
4720 					g = getgrnam(curr);
4721 				else
4722 					g = getgrgid(rid);
4723 
4724 				if (g != NULL)
4725 					rid = g->gr_gid;
4726 				else {
4727 					(void) snprintf(errbuf, 256, gettext(
4728 					    "invalid group %s"),  curr);
4729 					allow_usage(un, B_TRUE, errbuf);
4730 				}
4731 			} else {
4732 				if (*endch != '\0') {
4733 					p = getpwnam(curr);
4734 				} else {
4735 					p = getpwuid(rid);
4736 				}
4737 
4738 				if (p == NULL)
4739 					if (*endch != '\0') {
4740 						g = getgrnam(curr);
4741 					} else {
4742 						g = getgrgid(rid);
4743 					}
4744 
4745 				if (p != NULL) {
4746 					who_type = ZFS_DELEG_USER;
4747 					rid = p->pw_uid;
4748 				} else if (g != NULL) {
4749 					who_type = ZFS_DELEG_GROUP;
4750 					rid = g->gr_gid;
4751 				} else {
4752 					(void) snprintf(errbuf, 256, gettext(
4753 					    "invalid user/group %s"), curr);
4754 					allow_usage(un, B_TRUE, errbuf);
4755 				}
4756 			}
4757 
4758 			(void) sprintf(id, "%u", rid);
4759 			who = id;
4760 
4761 			store_allow_perm(who_type, opts->local,
4762 			    opts->descend, who, opts->perms, *nvlp);
4763 			curr = delim + 1;
4764 		}
4765 	}
4766 
4767 	return (0);
4768 }
4769 
4770 static void
4771 print_set_creat_perms(uu_avl_t *who_avl)
4772 {
4773 	const char *sc_title[] = {
4774 		gettext("Permission sets:\n"),
4775 		gettext("Create time permissions:\n"),
4776 		NULL
4777 	};
4778 	const char **title_ptr = sc_title;
4779 	who_perm_node_t *who_node = NULL;
4780 	int prev_weight = -1;
4781 
4782 	for (who_node = uu_avl_first(who_avl); who_node != NULL;
4783 	    who_node = uu_avl_next(who_avl, who_node)) {
4784 		uu_avl_t *avl = who_node->who_perm.who_deleg_perm_avl;
4785 		zfs_deleg_who_type_t who_type = who_node->who_perm.who_type;
4786 		const char *who_name = who_node->who_perm.who_name;
4787 		int weight = who_type2weight(who_type);
4788 		boolean_t first = B_TRUE;
4789 		deleg_perm_node_t *deleg_node;
4790 
4791 		if (prev_weight != weight) {
4792 			(void) printf(*title_ptr++);
4793 			prev_weight = weight;
4794 		}
4795 
4796 		if (who_name == NULL || strnlen(who_name, 1) == 0)
4797 			(void) printf("\t");
4798 		else
4799 			(void) printf("\t%s ", who_name);
4800 
4801 		for (deleg_node = uu_avl_first(avl); deleg_node != NULL;
4802 		    deleg_node = uu_avl_next(avl, deleg_node)) {
4803 			if (first) {
4804 				(void) printf("%s",
4805 				    deleg_node->dpn_perm.dp_name);
4806 				first = B_FALSE;
4807 			} else
4808 				(void) printf(",%s",
4809 				    deleg_node->dpn_perm.dp_name);
4810 		}
4811 
4812 		(void) printf("\n");
4813 	}
4814 }
4815 
4816 static void inline
4817 print_uge_deleg_perms(uu_avl_t *who_avl, boolean_t local, boolean_t descend,
4818     const char *title)
4819 {
4820 	who_perm_node_t *who_node = NULL;
4821 	boolean_t prt_title = B_TRUE;
4822 	uu_avl_walk_t *walk;
4823 
4824 	if ((walk = uu_avl_walk_start(who_avl, UU_WALK_ROBUST)) == NULL)
4825 		nomem();
4826 
4827 	while ((who_node = uu_avl_walk_next(walk)) != NULL) {
4828 		const char *who_name = who_node->who_perm.who_name;
4829 		const char *nice_who_name = who_node->who_perm.who_ug_name;
4830 		uu_avl_t *avl = who_node->who_perm.who_deleg_perm_avl;
4831 		zfs_deleg_who_type_t who_type = who_node->who_perm.who_type;
4832 		char delim = ' ';
4833 		deleg_perm_node_t *deleg_node;
4834 		boolean_t prt_who = B_TRUE;
4835 
4836 		for (deleg_node = uu_avl_first(avl);
4837 		    deleg_node != NULL;
4838 		    deleg_node = uu_avl_next(avl, deleg_node)) {
4839 			if (local != deleg_node->dpn_perm.dp_local ||
4840 			    descend != deleg_node->dpn_perm.dp_descend)
4841 				continue;
4842 
4843 			if (prt_who) {
4844 				const char *who = NULL;
4845 				if (prt_title) {
4846 					prt_title = B_FALSE;
4847 					(void) printf(title);
4848 				}
4849 
4850 				switch (who_type) {
4851 				case ZFS_DELEG_USER_SETS:
4852 				case ZFS_DELEG_USER:
4853 					who = gettext("user");
4854 					if (nice_who_name)
4855 						who_name  = nice_who_name;
4856 					break;
4857 				case ZFS_DELEG_GROUP_SETS:
4858 				case ZFS_DELEG_GROUP:
4859 					who = gettext("group");
4860 					if (nice_who_name)
4861 						who_name  = nice_who_name;
4862 					break;
4863 				case ZFS_DELEG_EVERYONE_SETS:
4864 				case ZFS_DELEG_EVERYONE:
4865 					who = gettext("everyone");
4866 					who_name = NULL;
4867 				}
4868 
4869 				prt_who = B_FALSE;
4870 				if (who_name == NULL)
4871 					(void) printf("\t%s", who);
4872 				else
4873 					(void) printf("\t%s %s", who, who_name);
4874 			}
4875 
4876 			(void) printf("%c%s", delim,
4877 			    deleg_node->dpn_perm.dp_name);
4878 			delim = ',';
4879 		}
4880 
4881 		if (!prt_who)
4882 			(void) printf("\n");
4883 	}
4884 
4885 	uu_avl_walk_end(walk);
4886 }
4887 
4888 static void
4889 print_fs_perms(fs_perm_set_t *fspset)
4890 {
4891 	fs_perm_node_t *node = NULL;
4892 	char buf[ZFS_MAXNAMELEN+32];
4893 	const char *dsname = buf;
4894 
4895 	for (node = uu_list_first(fspset->fsps_list); node != NULL;
4896 	    node = uu_list_next(fspset->fsps_list, node)) {
4897 		uu_avl_t *sc_avl = node->fspn_fsperm.fsp_sc_avl;
4898 		uu_avl_t *uge_avl = node->fspn_fsperm.fsp_uge_avl;
4899 		int left = 0;
4900 
4901 		(void) snprintf(buf, ZFS_MAXNAMELEN+32,
4902 		    gettext("---- Permissions on %s "),
4903 		    node->fspn_fsperm.fsp_name);
4904 		(void) printf(dsname);
4905 		left = 70 - strlen(buf);
4906 		while (left-- > 0)
4907 			(void) printf("-");
4908 		(void) printf("\n");
4909 
4910 		print_set_creat_perms(sc_avl);
4911 		print_uge_deleg_perms(uge_avl, B_TRUE, B_FALSE,
4912 		    gettext("Local permissions:\n"));
4913 		print_uge_deleg_perms(uge_avl, B_FALSE, B_TRUE,
4914 		    gettext("Descendent permissions:\n"));
4915 		print_uge_deleg_perms(uge_avl, B_TRUE, B_TRUE,
4916 		    gettext("Local+Descendent permissions:\n"));
4917 	}
4918 }
4919 
4920 static fs_perm_set_t fs_perm_set = { NULL, NULL, NULL, NULL };
4921 
4922 struct deleg_perms {
4923 	boolean_t un;
4924 	nvlist_t *nvl;
4925 };
4926 
4927 static int
4928 set_deleg_perms(zfs_handle_t *zhp, void *data)
4929 {
4930 	struct deleg_perms *perms = (struct deleg_perms *)data;
4931 	zfs_type_t zfs_type = zfs_get_type(zhp);
4932 
4933 	if (zfs_type != ZFS_TYPE_FILESYSTEM && zfs_type != ZFS_TYPE_VOLUME)
4934 		return (0);
4935 
4936 	return (zfs_set_fsacl(zhp, perms->un, perms->nvl));
4937 }
4938 
4939 static int
4940 zfs_do_allow_unallow_impl(int argc, char **argv, boolean_t un)
4941 {
4942 	zfs_handle_t *zhp;
4943 	nvlist_t *perm_nvl = NULL;
4944 	nvlist_t *update_perm_nvl = NULL;
4945 	int error = 1;
4946 	int c;
4947 	struct allow_opts opts = { 0 };
4948 
4949 	const char *optstr = un ? "ldugecsrh" : "ldugecsh";
4950 
4951 	/* check opts */
4952 	while ((c = getopt(argc, argv, optstr)) != -1) {
4953 		switch (c) {
4954 		case 'l':
4955 			opts.local = B_TRUE;
4956 			break;
4957 		case 'd':
4958 			opts.descend = B_TRUE;
4959 			break;
4960 		case 'u':
4961 			opts.user = B_TRUE;
4962 			break;
4963 		case 'g':
4964 			opts.group = B_TRUE;
4965 			break;
4966 		case 'e':
4967 			opts.everyone = B_TRUE;
4968 			break;
4969 		case 's':
4970 			opts.set = B_TRUE;
4971 			break;
4972 		case 'c':
4973 			opts.create = B_TRUE;
4974 			break;
4975 		case 'r':
4976 			opts.recursive = B_TRUE;
4977 			break;
4978 		case ':':
4979 			(void) fprintf(stderr, gettext("missing argument for "
4980 			    "'%c' option\n"), optopt);
4981 			usage(B_FALSE);
4982 			break;
4983 		case 'h':
4984 			opts.prt_usage = B_TRUE;
4985 			break;
4986 		case '?':
4987 			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
4988 			    optopt);
4989 			usage(B_FALSE);
4990 		}
4991 	}
4992 
4993 	argc -= optind;
4994 	argv += optind;
4995 
4996 	/* check arguments */
4997 	parse_allow_args(argc, argv, un, &opts);
4998 
4999 	/* try to open the dataset */
5000 	if ((zhp = zfs_open(g_zfs, opts.dataset, ZFS_TYPE_FILESYSTEM |
5001 	    ZFS_TYPE_VOLUME)) == NULL) {
5002 		(void) fprintf(stderr, "Failed to open dataset: %s\n",
5003 		    opts.dataset);
5004 		return (-1);
5005 	}
5006 
5007 	if (zfs_get_fsacl(zhp, &perm_nvl) != 0)
5008 		goto cleanup2;
5009 
5010 	fs_perm_set_init(&fs_perm_set);
5011 	if (parse_fs_perm_set(&fs_perm_set, perm_nvl) != 0) {
5012 		(void) fprintf(stderr, "Failed to parse fsacl permissions\n");
5013 		goto cleanup1;
5014 	}
5015 
5016 	if (opts.prt_perms)
5017 		print_fs_perms(&fs_perm_set);
5018 	else {
5019 		(void) construct_fsacl_list(un, &opts, &update_perm_nvl);
5020 		if (zfs_set_fsacl(zhp, un, update_perm_nvl) != 0)
5021 			goto cleanup0;
5022 
5023 		if (un && opts.recursive) {
5024 			struct deleg_perms data = { un, update_perm_nvl };
5025 			if (zfs_iter_filesystems(zhp, set_deleg_perms,
5026 			    &data) != 0)
5027 				goto cleanup0;
5028 		}
5029 	}
5030 
5031 	error = 0;
5032 
5033 cleanup0:
5034 	nvlist_free(perm_nvl);
5035 	if (update_perm_nvl != NULL)
5036 		nvlist_free(update_perm_nvl);
5037 cleanup1:
5038 	fs_perm_set_fini(&fs_perm_set);
5039 cleanup2:
5040 	zfs_close(zhp);
5041 
5042 	return (error);
5043 }
5044 
5045 /*
5046  * zfs allow [-r] [-t] <tag> <snap> ...
5047  *
5048  *	-r	Recursively hold
5049  *	-t	Temporary hold (hidden option)
5050  *
5051  * Apply a user-hold with the given tag to the list of snapshots.
5052  */
5053 static int
5054 zfs_do_allow(int argc, char **argv)
5055 {
5056 	return (zfs_do_allow_unallow_impl(argc, argv, B_FALSE));
5057 }
5058 
5059 /*
5060  * zfs unallow [-r] [-t] <tag> <snap> ...
5061  *
5062  *	-r	Recursively hold
5063  *	-t	Temporary hold (hidden option)
5064  *
5065  * Apply a user-hold with the given tag to the list of snapshots.
5066  */
5067 static int
5068 zfs_do_unallow(int argc, char **argv)
5069 {
5070 	return (zfs_do_allow_unallow_impl(argc, argv, B_TRUE));
5071 }
5072 
5073 static int
5074 zfs_do_hold_rele_impl(int argc, char **argv, boolean_t holding)
5075 {
5076 	int errors = 0;
5077 	int i;
5078 	const char *tag;
5079 	boolean_t recursive = B_FALSE;
5080 	boolean_t temphold = B_FALSE;
5081 	const char *opts = holding ? "rt" : "r";
5082 	int c;
5083 
5084 	/* check options */
5085 	while ((c = getopt(argc, argv, opts)) != -1) {
5086 		switch (c) {
5087 		case 'r':
5088 			recursive = B_TRUE;
5089 			break;
5090 		case 't':
5091 			temphold = B_TRUE;
5092 			break;
5093 		case '?':
5094 			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
5095 			    optopt);
5096 			usage(B_FALSE);
5097 		}
5098 	}
5099 
5100 	argc -= optind;
5101 	argv += optind;
5102 
5103 	/* check number of arguments */
5104 	if (argc < 2)
5105 		usage(B_FALSE);
5106 
5107 	tag = argv[0];
5108 	--argc;
5109 	++argv;
5110 
5111 	if (holding && tag[0] == '.') {
5112 		/* tags starting with '.' are reserved for libzfs */
5113 		(void) fprintf(stderr, gettext("tag may not start with '.'\n"));
5114 		usage(B_FALSE);
5115 	}
5116 
5117 	for (i = 0; i < argc; ++i) {
5118 		zfs_handle_t *zhp;
5119 		char parent[ZFS_MAXNAMELEN];
5120 		const char *delim;
5121 		char *path = argv[i];
5122 
5123 		delim = strchr(path, '@');
5124 		if (delim == NULL) {
5125 			(void) fprintf(stderr,
5126 			    gettext("'%s' is not a snapshot\n"), path);
5127 			++errors;
5128 			continue;
5129 		}
5130 		(void) strncpy(parent, path, delim - path);
5131 		parent[delim - path] = '\0';
5132 
5133 		zhp = zfs_open(g_zfs, parent,
5134 		    ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME);
5135 		if (zhp == NULL) {
5136 			++errors;
5137 			continue;
5138 		}
5139 		if (holding) {
5140 			if (zfs_hold(zhp, delim+1, tag, recursive,
5141 			    temphold, B_FALSE, -1, 0, 0) != 0)
5142 				++errors;
5143 		} else {
5144 			if (zfs_release(zhp, delim+1, tag, recursive) != 0)
5145 				++errors;
5146 		}
5147 		zfs_close(zhp);
5148 	}
5149 
5150 	return (errors != 0);
5151 }
5152 
5153 /*
5154  * zfs hold [-r] [-t] <tag> <snap> ...
5155  *
5156  *	-r	Recursively hold
5157  *	-t	Temporary hold (hidden option)
5158  *
5159  * Apply a user-hold with the given tag to the list of snapshots.
5160  */
5161 static int
5162 zfs_do_hold(int argc, char **argv)
5163 {
5164 	return (zfs_do_hold_rele_impl(argc, argv, B_TRUE));
5165 }
5166 
5167 /*
5168  * zfs release [-r] <tag> <snap> ...
5169  *
5170  *	-r	Recursively release
5171  *
5172  * Release a user-hold with the given tag from the list of snapshots.
5173  */
5174 static int
5175 zfs_do_release(int argc, char **argv)
5176 {
5177 	return (zfs_do_hold_rele_impl(argc, argv, B_FALSE));
5178 }
5179 
5180 typedef struct holds_cbdata {
5181 	boolean_t	cb_recursive;
5182 	const char	*cb_snapname;
5183 	nvlist_t	**cb_nvlp;
5184 	size_t		cb_max_namelen;
5185 	size_t		cb_max_taglen;
5186 } holds_cbdata_t;
5187 
5188 #define	STRFTIME_FMT_STR "%a %b %e %k:%M %Y"
5189 #define	DATETIME_BUF_LEN (32)
5190 /*
5191  *
5192  */
5193 static void
5194 print_holds(boolean_t scripted, size_t nwidth, size_t tagwidth, nvlist_t *nvl)
5195 {
5196 	int i;
5197 	nvpair_t *nvp = NULL;
5198 	char *hdr_cols[] = { "NAME", "TAG", "TIMESTAMP" };
5199 	const char *col;
5200 
5201 	if (!scripted) {
5202 		for (i = 0; i < 3; i++) {
5203 			col = gettext(hdr_cols[i]);
5204 			if (i < 2)
5205 				(void) printf("%-*s  ", i ? tagwidth : nwidth,
5206 				    col);
5207 			else
5208 				(void) printf("%s\n", col);
5209 		}
5210 	}
5211 
5212 	while ((nvp = nvlist_next_nvpair(nvl, nvp)) != NULL) {
5213 		char *zname = nvpair_name(nvp);
5214 		nvlist_t *nvl2;
5215 		nvpair_t *nvp2 = NULL;
5216 		(void) nvpair_value_nvlist(nvp, &nvl2);
5217 		while ((nvp2 = nvlist_next_nvpair(nvl2, nvp2)) != NULL) {
5218 			char tsbuf[DATETIME_BUF_LEN];
5219 			char *tagname = nvpair_name(nvp2);
5220 			uint64_t val = 0;
5221 			time_t time;
5222 			struct tm t;
5223 			char sep = scripted ? '\t' : ' ';
5224 			size_t sepnum = scripted ? 1 : 2;
5225 
5226 			(void) nvpair_value_uint64(nvp2, &val);
5227 			time = (time_t)val;
5228 			(void) localtime_r(&time, &t);
5229 			(void) strftime(tsbuf, DATETIME_BUF_LEN,
5230 			    gettext(STRFTIME_FMT_STR), &t);
5231 
5232 			(void) printf("%-*s%*c%-*s%*c%s\n", nwidth, zname,
5233 			    sepnum, sep, tagwidth, tagname, sepnum, sep, tsbuf);
5234 		}
5235 	}
5236 }
5237 
5238 /*
5239  * Generic callback function to list a dataset or snapshot.
5240  */
5241 static int
5242 holds_callback(zfs_handle_t *zhp, void *data)
5243 {
5244 	holds_cbdata_t *cbp = data;
5245 	nvlist_t *top_nvl = *cbp->cb_nvlp;
5246 	nvlist_t *nvl = NULL;
5247 	nvpair_t *nvp = NULL;
5248 	const char *zname = zfs_get_name(zhp);
5249 	size_t znamelen = strnlen(zname, ZFS_MAXNAMELEN);
5250 
5251 	if (cbp->cb_recursive) {
5252 		const char *snapname;
5253 		char *delim  = strchr(zname, '@');
5254 		if (delim == NULL)
5255 			return (0);
5256 
5257 		snapname = delim + 1;
5258 		if (strcmp(cbp->cb_snapname, snapname))
5259 			return (0);
5260 	}
5261 
5262 	if (zfs_get_holds(zhp, &nvl) != 0)
5263 		return (-1);
5264 
5265 	if (znamelen > cbp->cb_max_namelen)
5266 		cbp->cb_max_namelen  = znamelen;
5267 
5268 	while ((nvp = nvlist_next_nvpair(nvl, nvp)) != NULL) {
5269 		const char *tag = nvpair_name(nvp);
5270 		size_t taglen = strnlen(tag, MAXNAMELEN);
5271 		if (taglen > cbp->cb_max_taglen)
5272 			cbp->cb_max_taglen  = taglen;
5273 	}
5274 
5275 	return (nvlist_add_nvlist(top_nvl, zname, nvl));
5276 }
5277 
5278 /*
5279  * zfs holds [-r] <snap> ...
5280  *
5281  *	-r	Recursively hold
5282  */
5283 static int
5284 zfs_do_holds(int argc, char **argv)
5285 {
5286 	int errors = 0;
5287 	int c;
5288 	int i;
5289 	boolean_t scripted = B_FALSE;
5290 	boolean_t recursive = B_FALSE;
5291 	const char *opts = "rH";
5292 	nvlist_t *nvl;
5293 
5294 	int types = ZFS_TYPE_SNAPSHOT;
5295 	holds_cbdata_t cb = { 0 };
5296 
5297 	int limit = 0;
5298 	int ret = 0;
5299 	int flags = 0;
5300 
5301 	/* check options */
5302 	while ((c = getopt(argc, argv, opts)) != -1) {
5303 		switch (c) {
5304 		case 'r':
5305 			recursive = B_TRUE;
5306 			break;
5307 		case 'H':
5308 			scripted = B_TRUE;
5309 			break;
5310 		case '?':
5311 			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
5312 			    optopt);
5313 			usage(B_FALSE);
5314 		}
5315 	}
5316 
5317 	if (recursive) {
5318 		types |= ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME;
5319 		flags |= ZFS_ITER_RECURSE;
5320 	}
5321 
5322 	argc -= optind;
5323 	argv += optind;
5324 
5325 	/* check number of arguments */
5326 	if (argc < 1)
5327 		usage(B_FALSE);
5328 
5329 	if (nvlist_alloc(&nvl, NV_UNIQUE_NAME, 0) != 0)
5330 		nomem();
5331 
5332 	for (i = 0; i < argc; ++i) {
5333 		char *snapshot = argv[i];
5334 		const char *delim;
5335 		const char *snapname;
5336 
5337 		delim = strchr(snapshot, '@');
5338 		if (delim == NULL) {
5339 			(void) fprintf(stderr,
5340 			    gettext("'%s' is not a snapshot\n"), snapshot);
5341 			++errors;
5342 			continue;
5343 		}
5344 		snapname = delim + 1;
5345 		if (recursive)
5346 			snapshot[delim - snapshot] = '\0';
5347 
5348 		cb.cb_recursive = recursive;
5349 		cb.cb_snapname = snapname;
5350 		cb.cb_nvlp = &nvl;
5351 
5352 		/*
5353 		 *  1. collect holds data, set format options
5354 		 */
5355 		ret = zfs_for_each(argc, argv, flags, types, NULL, NULL, limit,
5356 		    holds_callback, &cb);
5357 		if (ret != 0)
5358 			++errors;
5359 	}
5360 
5361 	/*
5362 	 *  2. print holds data
5363 	 */
5364 	print_holds(scripted, cb.cb_max_namelen, cb.cb_max_taglen, nvl);
5365 
5366 	if (nvlist_empty(nvl))
5367 		(void) printf(gettext("no datasets available\n"));
5368 
5369 	nvlist_free(nvl);
5370 
5371 	return (0 != errors);
5372 }
5373 
5374 #define	CHECK_SPINNER 30
5375 #define	SPINNER_TIME 3		/* seconds */
5376 #define	MOUNT_TIME 5		/* seconds */
5377 
5378 static int
5379 get_one_dataset(zfs_handle_t *zhp, void *data)
5380 {
5381 	static char *spin[] = { "-", "\\", "|", "/" };
5382 	static int spinval = 0;
5383 	static int spincheck = 0;
5384 	static time_t last_spin_time = (time_t)0;
5385 	get_all_cb_t *cbp = data;
5386 	zfs_type_t type = zfs_get_type(zhp);
5387 
5388 	if (cbp->cb_verbose) {
5389 		if (--spincheck < 0) {
5390 			time_t now = time(NULL);
5391 			if (last_spin_time + SPINNER_TIME < now) {
5392 				update_progress(spin[spinval++ % 4]);
5393 				last_spin_time = now;
5394 			}
5395 			spincheck = CHECK_SPINNER;
5396 		}
5397 	}
5398 
5399 	/*
5400 	 * Interate over any nested datasets.
5401 	 */
5402 	if (zfs_iter_filesystems(zhp, get_one_dataset, data) != 0) {
5403 		zfs_close(zhp);
5404 		return (1);
5405 	}
5406 
5407 	/*
5408 	 * Skip any datasets whose type does not match.
5409 	 */
5410 	if ((type & ZFS_TYPE_FILESYSTEM) == 0) {
5411 		zfs_close(zhp);
5412 		return (0);
5413 	}
5414 	libzfs_add_handle(cbp, zhp);
5415 	assert(cbp->cb_used <= cbp->cb_alloc);
5416 
5417 	return (0);
5418 }
5419 
5420 static void
5421 get_all_datasets(zfs_handle_t ***dslist, size_t *count, boolean_t verbose)
5422 {
5423 	get_all_cb_t cb = { 0 };
5424 	cb.cb_verbose = verbose;
5425 	cb.cb_getone = get_one_dataset;
5426 
5427 	if (verbose)
5428 		set_progress_header(gettext("Reading ZFS config"));
5429 	(void) zfs_iter_root(g_zfs, get_one_dataset, &cb);
5430 
5431 	*dslist = cb.cb_handles;
5432 	*count = cb.cb_used;
5433 
5434 	if (verbose)
5435 		finish_progress(gettext("done."));
5436 }
5437 
5438 /*
5439  * Generic callback for sharing or mounting filesystems.  Because the code is so
5440  * similar, we have a common function with an extra parameter to determine which
5441  * mode we are using.
5442  */
5443 #define	OP_SHARE	0x1
5444 #define	OP_MOUNT	0x2
5445 
5446 /*
5447  * Share or mount a dataset.
5448  */
5449 static int
5450 share_mount_one(zfs_handle_t *zhp, int op, int flags, char *protocol,
5451     boolean_t explicit, const char *options)
5452 {
5453 	char mountpoint[ZFS_MAXPROPLEN];
5454 	char shareopts[ZFS_MAXPROPLEN];
5455 	char smbshareopts[ZFS_MAXPROPLEN];
5456 	const char *cmdname = op == OP_SHARE ? "share" : "mount";
5457 	struct mnttab mnt;
5458 	uint64_t zoned, canmount;
5459 	boolean_t shared_nfs, shared_smb;
5460 
5461 	assert(zfs_get_type(zhp) & ZFS_TYPE_FILESYSTEM);
5462 
5463 	/*
5464 	 * Check to make sure we can mount/share this dataset.  If we
5465 	 * are in the global zone and the filesystem is exported to a
5466 	 * local zone, or if we are in a local zone and the
5467 	 * filesystem is not exported, then it is an error.
5468 	 */
5469 	zoned = zfs_prop_get_int(zhp, ZFS_PROP_ZONED);
5470 
5471 	if (zoned && getzoneid() == GLOBAL_ZONEID) {
5472 		if (!explicit)
5473 			return (0);
5474 
5475 		(void) fprintf(stderr, gettext("cannot %s '%s': "
5476 		    "dataset is exported to a local zone\n"), cmdname,
5477 		    zfs_get_name(zhp));
5478 		return (1);
5479 
5480 	} else if (!zoned && getzoneid() != GLOBAL_ZONEID) {
5481 		if (!explicit)
5482 			return (0);
5483 
5484 		(void) fprintf(stderr, gettext("cannot %s '%s': "
5485 		    "permission denied\n"), cmdname,
5486 		    zfs_get_name(zhp));
5487 		return (1);
5488 	}
5489 
5490 	/*
5491 	 * Ignore any filesystems which don't apply to us. This
5492 	 * includes those with a legacy mountpoint, or those with
5493 	 * legacy share options.
5494 	 */
5495 	verify(zfs_prop_get(zhp, ZFS_PROP_MOUNTPOINT, mountpoint,
5496 	    sizeof (mountpoint), NULL, NULL, 0, B_FALSE) == 0);
5497 	verify(zfs_prop_get(zhp, ZFS_PROP_SHARENFS, shareopts,
5498 	    sizeof (shareopts), NULL, NULL, 0, B_FALSE) == 0);
5499 	verify(zfs_prop_get(zhp, ZFS_PROP_SHARESMB, smbshareopts,
5500 	    sizeof (smbshareopts), NULL, NULL, 0, B_FALSE) == 0);
5501 
5502 	if (op == OP_SHARE && strcmp(shareopts, "off") == 0 &&
5503 	    strcmp(smbshareopts, "off") == 0) {
5504 		if (!explicit)
5505 			return (0);
5506 
5507 		(void) fprintf(stderr, gettext("cannot share '%s': "
5508 		    "legacy share\n"), zfs_get_name(zhp));
5509 		(void) fprintf(stderr, gettext("use share(1M) to "
5510 		    "share this filesystem, or set "
5511 		    "sharenfs property on\n"));
5512 		return (1);
5513 	}
5514 
5515 	/*
5516 	 * We cannot share or mount legacy filesystems. If the
5517 	 * shareopts is non-legacy but the mountpoint is legacy, we
5518 	 * treat it as a legacy share.
5519 	 */
5520 	if (strcmp(mountpoint, "legacy") == 0) {
5521 		if (!explicit)
5522 			return (0);
5523 
5524 		(void) fprintf(stderr, gettext("cannot %s '%s': "
5525 		    "legacy mountpoint\n"), cmdname, zfs_get_name(zhp));
5526 		(void) fprintf(stderr, gettext("use %s(1M) to "
5527 		    "%s this filesystem\n"), cmdname, cmdname);
5528 		return (1);
5529 	}
5530 
5531 	if (strcmp(mountpoint, "none") == 0) {
5532 		if (!explicit)
5533 			return (0);
5534 
5535 		(void) fprintf(stderr, gettext("cannot %s '%s': no "
5536 		    "mountpoint set\n"), cmdname, zfs_get_name(zhp));
5537 		return (1);
5538 	}
5539 
5540 	/*
5541 	 * canmount	explicit	outcome
5542 	 * on		no		pass through
5543 	 * on		yes		pass through
5544 	 * off		no		return 0
5545 	 * off		yes		display error, return 1
5546 	 * noauto	no		return 0
5547 	 * noauto	yes		pass through
5548 	 */
5549 	canmount = zfs_prop_get_int(zhp, ZFS_PROP_CANMOUNT);
5550 	if (canmount == ZFS_CANMOUNT_OFF) {
5551 		if (!explicit)
5552 			return (0);
5553 
5554 		(void) fprintf(stderr, gettext("cannot %s '%s': "
5555 		    "'canmount' property is set to 'off'\n"), cmdname,
5556 		    zfs_get_name(zhp));
5557 		return (1);
5558 	} else if (canmount == ZFS_CANMOUNT_NOAUTO && !explicit) {
5559 		return (0);
5560 	}
5561 
5562 	/*
5563 	 * At this point, we have verified that the mountpoint and/or
5564 	 * shareopts are appropriate for auto management. If the
5565 	 * filesystem is already mounted or shared, return (failing
5566 	 * for explicit requests); otherwise mount or share the
5567 	 * filesystem.
5568 	 */
5569 	switch (op) {
5570 	case OP_SHARE:
5571 
5572 		shared_nfs = zfs_is_shared_nfs(zhp, NULL);
5573 		shared_smb = zfs_is_shared_smb(zhp, NULL);
5574 
5575 		if (shared_nfs && shared_smb ||
5576 		    (shared_nfs && strcmp(shareopts, "on") == 0 &&
5577 		    strcmp(smbshareopts, "off") == 0) ||
5578 		    (shared_smb && strcmp(smbshareopts, "on") == 0 &&
5579 		    strcmp(shareopts, "off") == 0)) {
5580 			if (!explicit)
5581 				return (0);
5582 
5583 			(void) fprintf(stderr, gettext("cannot share "
5584 			    "'%s': filesystem already shared\n"),
5585 			    zfs_get_name(zhp));
5586 			return (1);
5587 		}
5588 
5589 		if (!zfs_is_mounted(zhp, NULL) &&
5590 		    zfs_mount(zhp, NULL, 0) != 0)
5591 			return (1);
5592 
5593 		if (protocol == NULL) {
5594 			if (zfs_shareall(zhp) != 0)
5595 				return (1);
5596 		} else if (strcmp(protocol, "nfs") == 0) {
5597 			if (zfs_share_nfs(zhp))
5598 				return (1);
5599 		} else if (strcmp(protocol, "smb") == 0) {
5600 			if (zfs_share_smb(zhp))
5601 				return (1);
5602 		} else {
5603 			(void) fprintf(stderr, gettext("cannot share "
5604 			    "'%s': invalid share type '%s' "
5605 			    "specified\n"),
5606 			    zfs_get_name(zhp), protocol);
5607 			return (1);
5608 		}
5609 
5610 		break;
5611 
5612 	case OP_MOUNT:
5613 		if (options == NULL)
5614 			mnt.mnt_mntopts = "";
5615 		else
5616 			mnt.mnt_mntopts = (char *)options;
5617 
5618 		if (!hasmntopt(&mnt, MNTOPT_REMOUNT) &&
5619 		    zfs_is_mounted(zhp, NULL)) {
5620 			if (!explicit)
5621 				return (0);
5622 
5623 			(void) fprintf(stderr, gettext("cannot mount "
5624 			    "'%s': filesystem already mounted\n"),
5625 			    zfs_get_name(zhp));
5626 			return (1);
5627 		}
5628 
5629 		if (zfs_mount(zhp, options, flags) != 0)
5630 			return (1);
5631 		break;
5632 	}
5633 
5634 	return (0);
5635 }
5636 
5637 /*
5638  * Reports progress in the form "(current/total)".  Not thread-safe.
5639  */
5640 static void
5641 report_mount_progress(int current, int total)
5642 {
5643 	static time_t last_progress_time = 0;
5644 	time_t now = time(NULL);
5645 	char info[32];
5646 
5647 	/* report 1..n instead of 0..n-1 */
5648 	++current;
5649 
5650 	/* display header if we're here for the first time */
5651 	if (current == 1) {
5652 		set_progress_header(gettext("Mounting ZFS filesystems"));
5653 	} else if (current != total && last_progress_time + MOUNT_TIME >= now) {
5654 		/* too soon to report again */
5655 		return;
5656 	}
5657 
5658 	last_progress_time = now;
5659 
5660 	(void) sprintf(info, "(%d/%d)", current, total);
5661 
5662 	if (current == total)
5663 		finish_progress(info);
5664 	else
5665 		update_progress(info);
5666 }
5667 
5668 static void
5669 append_options(char *mntopts, char *newopts)
5670 {
5671 	int len = strlen(mntopts);
5672 
5673 	/* original length plus new string to append plus 1 for the comma */
5674 	if (len + 1 + strlen(newopts) >= MNT_LINE_MAX) {
5675 		(void) fprintf(stderr, gettext("the opts argument for "
5676 		    "'%c' option is too long (more than %d chars)\n"),
5677 		    "-o", MNT_LINE_MAX);
5678 		usage(B_FALSE);
5679 	}
5680 
5681 	if (*mntopts)
5682 		mntopts[len++] = ',';
5683 
5684 	(void) strcpy(&mntopts[len], newopts);
5685 }
5686 
5687 static int
5688 share_mount(int op, int argc, char **argv)
5689 {
5690 	int do_all = 0;
5691 	boolean_t verbose = B_FALSE;
5692 	int c, ret = 0;
5693 	char *options = NULL;
5694 	int flags = 0;
5695 
5696 	/* check options */
5697 	while ((c = getopt(argc, argv, op == OP_MOUNT ? ":avo:O" : "a"))
5698 	    != -1) {
5699 		switch (c) {
5700 		case 'a':
5701 			do_all = 1;
5702 			break;
5703 		case 'v':
5704 			verbose = B_TRUE;
5705 			break;
5706 		case 'o':
5707 			if (*optarg == '\0') {
5708 				(void) fprintf(stderr, gettext("empty mount "
5709 				    "options (-o) specified\n"));
5710 				usage(B_FALSE);
5711 			}
5712 
5713 			if (options == NULL)
5714 				options = safe_malloc(MNT_LINE_MAX + 1);
5715 
5716 			/* option validation is done later */
5717 			append_options(options, optarg);
5718 			break;
5719 
5720 		case 'O':
5721 			flags |= MS_OVERLAY;
5722 			break;
5723 		case ':':
5724 			(void) fprintf(stderr, gettext("missing argument for "
5725 			    "'%c' option\n"), optopt);
5726 			usage(B_FALSE);
5727 			break;
5728 		case '?':
5729 			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
5730 			    optopt);
5731 			usage(B_FALSE);
5732 		}
5733 	}
5734 
5735 	argc -= optind;
5736 	argv += optind;
5737 
5738 	/* check number of arguments */
5739 	if (do_all) {
5740 		zfs_handle_t **dslist = NULL;
5741 		size_t i, count = 0;
5742 		char *protocol = NULL;
5743 
5744 		if (op == OP_SHARE && argc > 0) {
5745 			if (strcmp(argv[0], "nfs") != 0 &&
5746 			    strcmp(argv[0], "smb") != 0) {
5747 				(void) fprintf(stderr, gettext("share type "
5748 				    "must be 'nfs' or 'smb'\n"));
5749 				usage(B_FALSE);
5750 			}
5751 			protocol = argv[0];
5752 			argc--;
5753 			argv++;
5754 		}
5755 
5756 		if (argc != 0) {
5757 			(void) fprintf(stderr, gettext("too many arguments\n"));
5758 			usage(B_FALSE);
5759 		}
5760 
5761 		start_progress_timer();
5762 		get_all_datasets(&dslist, &count, verbose);
5763 
5764 		if (count == 0)
5765 			return (0);
5766 
5767 		qsort(dslist, count, sizeof (void *), libzfs_dataset_cmp);
5768 
5769 		for (i = 0; i < count; i++) {
5770 			if (verbose)
5771 				report_mount_progress(i, count);
5772 
5773 			if (share_mount_one(dslist[i], op, flags, protocol,
5774 			    B_FALSE, options) != 0)
5775 				ret = 1;
5776 			zfs_close(dslist[i]);
5777 		}
5778 
5779 		free(dslist);
5780 	} else if (argc == 0) {
5781 		struct mnttab entry;
5782 
5783 		if ((op == OP_SHARE) || (options != NULL)) {
5784 			(void) fprintf(stderr, gettext("missing filesystem "
5785 			    "argument (specify -a for all)\n"));
5786 			usage(B_FALSE);
5787 		}
5788 
5789 		/*
5790 		 * When mount is given no arguments, go through /etc/mnttab and
5791 		 * display any active ZFS mounts.  We hide any snapshots, since
5792 		 * they are controlled automatically.
5793 		 */
5794 		rewind(mnttab_file);
5795 		while (getmntent(mnttab_file, &entry) == 0) {
5796 			if (strcmp(entry.mnt_fstype, MNTTYPE_ZFS) != 0 ||
5797 			    strchr(entry.mnt_special, '@') != NULL)
5798 				continue;
5799 
5800 			(void) printf("%-30s  %s\n", entry.mnt_special,
5801 			    entry.mnt_mountp);
5802 		}
5803 
5804 	} else {
5805 		zfs_handle_t *zhp;
5806 
5807 		if (argc > 1) {
5808 			(void) fprintf(stderr,
5809 			    gettext("too many arguments\n"));
5810 			usage(B_FALSE);
5811 		}
5812 
5813 		if ((zhp = zfs_open(g_zfs, argv[0],
5814 		    ZFS_TYPE_FILESYSTEM)) == NULL) {
5815 			ret = 1;
5816 		} else {
5817 			ret = share_mount_one(zhp, op, flags, NULL, B_TRUE,
5818 			    options);
5819 			zfs_close(zhp);
5820 		}
5821 	}
5822 
5823 	return (ret);
5824 }
5825 
5826 /*
5827  * zfs mount -a [nfs]
5828  * zfs mount filesystem
5829  *
5830  * Mount all filesystems, or mount the given filesystem.
5831  */
5832 static int
5833 zfs_do_mount(int argc, char **argv)
5834 {
5835 	return (share_mount(OP_MOUNT, argc, argv));
5836 }
5837 
5838 /*
5839  * zfs share -a [nfs | smb]
5840  * zfs share filesystem
5841  *
5842  * Share all filesystems, or share the given filesystem.
5843  */
5844 static int
5845 zfs_do_share(int argc, char **argv)
5846 {
5847 	return (share_mount(OP_SHARE, argc, argv));
5848 }
5849 
5850 typedef struct unshare_unmount_node {
5851 	zfs_handle_t	*un_zhp;
5852 	char		*un_mountp;
5853 	uu_avl_node_t	un_avlnode;
5854 } unshare_unmount_node_t;
5855 
5856 /* ARGSUSED */
5857 static int
5858 unshare_unmount_compare(const void *larg, const void *rarg, void *unused)
5859 {
5860 	const unshare_unmount_node_t *l = larg;
5861 	const unshare_unmount_node_t *r = rarg;
5862 
5863 	return (strcmp(l->un_mountp, r->un_mountp));
5864 }
5865 
5866 /*
5867  * Convenience routine used by zfs_do_umount() and manual_unmount().  Given an
5868  * absolute path, find the entry /etc/mnttab, verify that its a ZFS filesystem,
5869  * and unmount it appropriately.
5870  */
5871 static int
5872 unshare_unmount_path(int op, char *path, int flags, boolean_t is_manual)
5873 {
5874 	zfs_handle_t *zhp;
5875 	int ret = 0;
5876 	struct stat64 statbuf;
5877 	struct extmnttab entry;
5878 	const char *cmdname = (op == OP_SHARE) ? "unshare" : "unmount";
5879 	ino_t path_inode;
5880 
5881 	/*
5882 	 * Search for the path in /etc/mnttab.  Rather than looking for the
5883 	 * specific path, which can be fooled by non-standard paths (i.e. ".."
5884 	 * or "//"), we stat() the path and search for the corresponding
5885 	 * (major,minor) device pair.
5886 	 */
5887 	if (stat64(path, &statbuf) != 0) {
5888 		(void) fprintf(stderr, gettext("cannot %s '%s': %s\n"),
5889 		    cmdname, path, strerror(errno));
5890 		return (1);
5891 	}
5892 	path_inode = statbuf.st_ino;
5893 
5894 	/*
5895 	 * Search for the given (major,minor) pair in the mount table.
5896 	 */
5897 	rewind(mnttab_file);
5898 	while ((ret = getextmntent(mnttab_file, &entry, 0)) == 0) {
5899 		if (entry.mnt_major == major(statbuf.st_dev) &&
5900 		    entry.mnt_minor == minor(statbuf.st_dev))
5901 			break;
5902 	}
5903 	if (ret != 0) {
5904 		if (op == OP_SHARE) {
5905 			(void) fprintf(stderr, gettext("cannot %s '%s': not "
5906 			    "currently mounted\n"), cmdname, path);
5907 			return (1);
5908 		}
5909 		(void) fprintf(stderr, gettext("warning: %s not in mnttab\n"),
5910 		    path);
5911 		if ((ret = umount2(path, flags)) != 0)
5912 			(void) fprintf(stderr, gettext("%s: %s\n"), path,
5913 			    strerror(errno));
5914 		return (ret != 0);
5915 	}
5916 
5917 	if (strcmp(entry.mnt_fstype, MNTTYPE_ZFS) != 0) {
5918 		(void) fprintf(stderr, gettext("cannot %s '%s': not a ZFS "
5919 		    "filesystem\n"), cmdname, path);
5920 		return (1);
5921 	}
5922 
5923 	if ((zhp = zfs_open(g_zfs, entry.mnt_special,
5924 	    ZFS_TYPE_FILESYSTEM)) == NULL)
5925 		return (1);
5926 
5927 	ret = 1;
5928 	if (stat64(entry.mnt_mountp, &statbuf) != 0) {
5929 		(void) fprintf(stderr, gettext("cannot %s '%s': %s\n"),
5930 		    cmdname, path, strerror(errno));
5931 		goto out;
5932 	} else if (statbuf.st_ino != path_inode) {
5933 		(void) fprintf(stderr, gettext("cannot "
5934 		    "%s '%s': not a mountpoint\n"), cmdname, path);
5935 		goto out;
5936 	}
5937 
5938 	if (op == OP_SHARE) {
5939 		char nfs_mnt_prop[ZFS_MAXPROPLEN];
5940 		char smbshare_prop[ZFS_MAXPROPLEN];
5941 
5942 		verify(zfs_prop_get(zhp, ZFS_PROP_SHARENFS, nfs_mnt_prop,
5943 		    sizeof (nfs_mnt_prop), NULL, NULL, 0, B_FALSE) == 0);
5944 		verify(zfs_prop_get(zhp, ZFS_PROP_SHARESMB, smbshare_prop,
5945 		    sizeof (smbshare_prop), NULL, NULL, 0, B_FALSE) == 0);
5946 
5947 		if (strcmp(nfs_mnt_prop, "off") == 0 &&
5948 		    strcmp(smbshare_prop, "off") == 0) {
5949 			(void) fprintf(stderr, gettext("cannot unshare "
5950 			    "'%s': legacy share\n"), path);
5951 			(void) fprintf(stderr, gettext("use "
5952 			    "unshare(1M) to unshare this filesystem\n"));
5953 		} else if (!zfs_is_shared(zhp)) {
5954 			(void) fprintf(stderr, gettext("cannot unshare '%s': "
5955 			    "not currently shared\n"), path);
5956 		} else {
5957 			ret = zfs_unshareall_bypath(zhp, path);
5958 		}
5959 	} else {
5960 		char mtpt_prop[ZFS_MAXPROPLEN];
5961 
5962 		verify(zfs_prop_get(zhp, ZFS_PROP_MOUNTPOINT, mtpt_prop,
5963 		    sizeof (mtpt_prop), NULL, NULL, 0, B_FALSE) == 0);
5964 
5965 		if (is_manual) {
5966 			ret = zfs_unmount(zhp, NULL, flags);
5967 		} else if (strcmp(mtpt_prop, "legacy") == 0) {
5968 			(void) fprintf(stderr, gettext("cannot unmount "
5969 			    "'%s': legacy mountpoint\n"),
5970 			    zfs_get_name(zhp));
5971 			(void) fprintf(stderr, gettext("use umount(1M) "
5972 			    "to unmount this filesystem\n"));
5973 		} else {
5974 			ret = zfs_unmountall(zhp, flags);
5975 		}
5976 	}
5977 
5978 out:
5979 	zfs_close(zhp);
5980 
5981 	return (ret != 0);
5982 }
5983 
5984 /*
5985  * Generic callback for unsharing or unmounting a filesystem.
5986  */
5987 static int
5988 unshare_unmount(int op, int argc, char **argv)
5989 {
5990 	int do_all = 0;
5991 	int flags = 0;
5992 	int ret = 0;
5993 	int c;
5994 	zfs_handle_t *zhp;
5995 	char nfs_mnt_prop[ZFS_MAXPROPLEN];
5996 	char sharesmb[ZFS_MAXPROPLEN];
5997 
5998 	/* check options */
5999 	while ((c = getopt(argc, argv, op == OP_SHARE ? "a" : "af")) != -1) {
6000 		switch (c) {
6001 		case 'a':
6002 			do_all = 1;
6003 			break;
6004 		case 'f':
6005 			flags = MS_FORCE;
6006 			break;
6007 		case '?':
6008 			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
6009 			    optopt);
6010 			usage(B_FALSE);
6011 		}
6012 	}
6013 
6014 	argc -= optind;
6015 	argv += optind;
6016 
6017 	if (do_all) {
6018 		/*
6019 		 * We could make use of zfs_for_each() to walk all datasets in
6020 		 * the system, but this would be very inefficient, especially
6021 		 * since we would have to linearly search /etc/mnttab for each
6022 		 * one.  Instead, do one pass through /etc/mnttab looking for
6023 		 * zfs entries and call zfs_unmount() for each one.
6024 		 *
6025 		 * Things get a little tricky if the administrator has created
6026 		 * mountpoints beneath other ZFS filesystems.  In this case, we
6027 		 * have to unmount the deepest filesystems first.  To accomplish
6028 		 * this, we place all the mountpoints in an AVL tree sorted by
6029 		 * the special type (dataset name), and walk the result in
6030 		 * reverse to make sure to get any snapshots first.
6031 		 */
6032 		struct mnttab entry;
6033 		uu_avl_pool_t *pool;
6034 		uu_avl_t *tree;
6035 		unshare_unmount_node_t *node;
6036 		uu_avl_index_t idx;
6037 		uu_avl_walk_t *walk;
6038 
6039 		if (argc != 0) {
6040 			(void) fprintf(stderr, gettext("too many arguments\n"));
6041 			usage(B_FALSE);
6042 		}
6043 
6044 		if (((pool = uu_avl_pool_create("unmount_pool",
6045 		    sizeof (unshare_unmount_node_t),
6046 		    offsetof(unshare_unmount_node_t, un_avlnode),
6047 		    unshare_unmount_compare, UU_DEFAULT)) == NULL) ||
6048 		    ((tree = uu_avl_create(pool, NULL, UU_DEFAULT)) == NULL))
6049 			nomem();
6050 
6051 		rewind(mnttab_file);
6052 		while (getmntent(mnttab_file, &entry) == 0) {
6053 
6054 			/* ignore non-ZFS entries */
6055 			if (strcmp(entry.mnt_fstype, MNTTYPE_ZFS) != 0)
6056 				continue;
6057 
6058 			/* ignore snapshots */
6059 			if (strchr(entry.mnt_special, '@') != NULL)
6060 				continue;
6061 
6062 			if ((zhp = zfs_open(g_zfs, entry.mnt_special,
6063 			    ZFS_TYPE_FILESYSTEM)) == NULL) {
6064 				ret = 1;
6065 				continue;
6066 			}
6067 
6068 			switch (op) {
6069 			case OP_SHARE:
6070 				verify(zfs_prop_get(zhp, ZFS_PROP_SHARENFS,
6071 				    nfs_mnt_prop,
6072 				    sizeof (nfs_mnt_prop),
6073 				    NULL, NULL, 0, B_FALSE) == 0);
6074 				if (strcmp(nfs_mnt_prop, "off") != 0)
6075 					break;
6076 				verify(zfs_prop_get(zhp, ZFS_PROP_SHARESMB,
6077 				    nfs_mnt_prop,
6078 				    sizeof (nfs_mnt_prop),
6079 				    NULL, NULL, 0, B_FALSE) == 0);
6080 				if (strcmp(nfs_mnt_prop, "off") == 0)
6081 					continue;
6082 				break;
6083 			case OP_MOUNT:
6084 				/* Ignore legacy mounts */
6085 				verify(zfs_prop_get(zhp, ZFS_PROP_MOUNTPOINT,
6086 				    nfs_mnt_prop,
6087 				    sizeof (nfs_mnt_prop),
6088 				    NULL, NULL, 0, B_FALSE) == 0);
6089 				if (strcmp(nfs_mnt_prop, "legacy") == 0)
6090 					continue;
6091 				/* Ignore canmount=noauto mounts */
6092 				if (zfs_prop_get_int(zhp, ZFS_PROP_CANMOUNT) ==
6093 				    ZFS_CANMOUNT_NOAUTO)
6094 					continue;
6095 			default:
6096 				break;
6097 			}
6098 
6099 			node = safe_malloc(sizeof (unshare_unmount_node_t));
6100 			node->un_zhp = zhp;
6101 			node->un_mountp = safe_strdup(entry.mnt_mountp);
6102 
6103 			uu_avl_node_init(node, &node->un_avlnode, pool);
6104 
6105 			if (uu_avl_find(tree, node, NULL, &idx) == NULL) {
6106 				uu_avl_insert(tree, node, idx);
6107 			} else {
6108 				zfs_close(node->un_zhp);
6109 				free(node->un_mountp);
6110 				free(node);
6111 			}
6112 		}
6113 
6114 		/*
6115 		 * Walk the AVL tree in reverse, unmounting each filesystem and
6116 		 * removing it from the AVL tree in the process.
6117 		 */
6118 		if ((walk = uu_avl_walk_start(tree,
6119 		    UU_WALK_REVERSE | UU_WALK_ROBUST)) == NULL)
6120 			nomem();
6121 
6122 		while ((node = uu_avl_walk_next(walk)) != NULL) {
6123 			uu_avl_remove(tree, node);
6124 
6125 			switch (op) {
6126 			case OP_SHARE:
6127 				if (zfs_unshareall_bypath(node->un_zhp,
6128 				    node->un_mountp) != 0)
6129 					ret = 1;
6130 				break;
6131 
6132 			case OP_MOUNT:
6133 				if (zfs_unmount(node->un_zhp,
6134 				    node->un_mountp, flags) != 0)
6135 					ret = 1;
6136 				break;
6137 			}
6138 
6139 			zfs_close(node->un_zhp);
6140 			free(node->un_mountp);
6141 			free(node);
6142 		}
6143 
6144 		uu_avl_walk_end(walk);
6145 		uu_avl_destroy(tree);
6146 		uu_avl_pool_destroy(pool);
6147 
6148 	} else {
6149 		if (argc != 1) {
6150 			if (argc == 0)
6151 				(void) fprintf(stderr,
6152 				    gettext("missing filesystem argument\n"));
6153 			else
6154 				(void) fprintf(stderr,
6155 				    gettext("too many arguments\n"));
6156 			usage(B_FALSE);
6157 		}
6158 
6159 		/*
6160 		 * We have an argument, but it may be a full path or a ZFS
6161 		 * filesystem.  Pass full paths off to unmount_path() (shared by
6162 		 * manual_unmount), otherwise open the filesystem and pass to
6163 		 * zfs_unmount().
6164 		 */
6165 		if (argv[0][0] == '/')
6166 			return (unshare_unmount_path(op, argv[0],
6167 			    flags, B_FALSE));
6168 
6169 		if ((zhp = zfs_open(g_zfs, argv[0],
6170 		    ZFS_TYPE_FILESYSTEM)) == NULL)
6171 			return (1);
6172 
6173 		verify(zfs_prop_get(zhp, op == OP_SHARE ?
6174 		    ZFS_PROP_SHARENFS : ZFS_PROP_MOUNTPOINT,
6175 		    nfs_mnt_prop, sizeof (nfs_mnt_prop), NULL,
6176 		    NULL, 0, B_FALSE) == 0);
6177 
6178 		switch (op) {
6179 		case OP_SHARE:
6180 			verify(zfs_prop_get(zhp, ZFS_PROP_SHARENFS,
6181 			    nfs_mnt_prop,
6182 			    sizeof (nfs_mnt_prop),
6183 			    NULL, NULL, 0, B_FALSE) == 0);
6184 			verify(zfs_prop_get(zhp, ZFS_PROP_SHARESMB,
6185 			    sharesmb, sizeof (sharesmb), NULL, NULL,
6186 			    0, B_FALSE) == 0);
6187 
6188 			if (strcmp(nfs_mnt_prop, "off") == 0 &&
6189 			    strcmp(sharesmb, "off") == 0) {
6190 				(void) fprintf(stderr, gettext("cannot "
6191 				    "unshare '%s': legacy share\n"),
6192 				    zfs_get_name(zhp));
6193 				(void) fprintf(stderr, gettext("use "
6194 				    "unshare(1M) to unshare this "
6195 				    "filesystem\n"));
6196 				ret = 1;
6197 			} else if (!zfs_is_shared(zhp)) {
6198 				(void) fprintf(stderr, gettext("cannot "
6199 				    "unshare '%s': not currently "
6200 				    "shared\n"), zfs_get_name(zhp));
6201 				ret = 1;
6202 			} else if (zfs_unshareall(zhp) != 0) {
6203 				ret = 1;
6204 			}
6205 			break;
6206 
6207 		case OP_MOUNT:
6208 			if (strcmp(nfs_mnt_prop, "legacy") == 0) {
6209 				(void) fprintf(stderr, gettext("cannot "
6210 				    "unmount '%s': legacy "
6211 				    "mountpoint\n"), zfs_get_name(zhp));
6212 				(void) fprintf(stderr, gettext("use "
6213 				    "umount(1M) to unmount this "
6214 				    "filesystem\n"));
6215 				ret = 1;
6216 			} else if (!zfs_is_mounted(zhp, NULL)) {
6217 				(void) fprintf(stderr, gettext("cannot "
6218 				    "unmount '%s': not currently "
6219 				    "mounted\n"),
6220 				    zfs_get_name(zhp));
6221 				ret = 1;
6222 			} else if (zfs_unmountall(zhp, flags) != 0) {
6223 				ret = 1;
6224 			}
6225 			break;
6226 		}
6227 
6228 		zfs_close(zhp);
6229 	}
6230 
6231 	return (ret);
6232 }
6233 
6234 /*
6235  * zfs unmount -a
6236  * zfs unmount filesystem
6237  *
6238  * Unmount all filesystems, or a specific ZFS filesystem.
6239  */
6240 static int
6241 zfs_do_unmount(int argc, char **argv)
6242 {
6243 	return (unshare_unmount(OP_MOUNT, argc, argv));
6244 }
6245 
6246 /*
6247  * zfs unshare -a
6248  * zfs unshare filesystem
6249  *
6250  * Unshare all filesystems, or a specific ZFS filesystem.
6251  */
6252 static int
6253 zfs_do_unshare(int argc, char **argv)
6254 {
6255 	return (unshare_unmount(OP_SHARE, argc, argv));
6256 }
6257 
6258 /*
6259  * Called when invoked as /etc/fs/zfs/mount.  Do the mount if the mountpoint is
6260  * 'legacy'.  Otherwise, complain that use should be using 'zfs mount'.
6261  */
6262 static int
6263 manual_mount(int argc, char **argv)
6264 {
6265 	zfs_handle_t *zhp;
6266 	char mountpoint[ZFS_MAXPROPLEN];
6267 	char mntopts[MNT_LINE_MAX] = { '\0' };
6268 	int ret = 0;
6269 	int c;
6270 	int flags = 0;
6271 	char *dataset, *path;
6272 
6273 	/* check options */
6274 	while ((c = getopt(argc, argv, ":mo:O")) != -1) {
6275 		switch (c) {
6276 		case 'o':
6277 			(void) strlcpy(mntopts, optarg, sizeof (mntopts));
6278 			break;
6279 		case 'O':
6280 			flags |= MS_OVERLAY;
6281 			break;
6282 		case 'm':
6283 			flags |= MS_NOMNTTAB;
6284 			break;
6285 		case ':':
6286 			(void) fprintf(stderr, gettext("missing argument for "
6287 			    "'%c' option\n"), optopt);
6288 			usage(B_FALSE);
6289 			break;
6290 		case '?':
6291 			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
6292 			    optopt);
6293 			(void) fprintf(stderr, gettext("usage: mount [-o opts] "
6294 			    "<path>\n"));
6295 			return (2);
6296 		}
6297 	}
6298 
6299 	argc -= optind;
6300 	argv += optind;
6301 
6302 	/* check that we only have two arguments */
6303 	if (argc != 2) {
6304 		if (argc == 0)
6305 			(void) fprintf(stderr, gettext("missing dataset "
6306 			    "argument\n"));
6307 		else if (argc == 1)
6308 			(void) fprintf(stderr,
6309 			    gettext("missing mountpoint argument\n"));
6310 		else
6311 			(void) fprintf(stderr, gettext("too many arguments\n"));
6312 		(void) fprintf(stderr, "usage: mount <dataset> <mountpoint>\n");
6313 		return (2);
6314 	}
6315 
6316 	dataset = argv[0];
6317 	path = argv[1];
6318 
6319 	/* try to open the dataset */
6320 	if ((zhp = zfs_open(g_zfs, dataset, ZFS_TYPE_FILESYSTEM)) == NULL)
6321 		return (1);
6322 
6323 	(void) zfs_prop_get(zhp, ZFS_PROP_MOUNTPOINT, mountpoint,
6324 	    sizeof (mountpoint), NULL, NULL, 0, B_FALSE);
6325 
6326 	/* check for legacy mountpoint and complain appropriately */
6327 	ret = 0;
6328 	if (strcmp(mountpoint, ZFS_MOUNTPOINT_LEGACY) == 0) {
6329 		if (mount(dataset, path, MS_OPTIONSTR | flags, MNTTYPE_ZFS,
6330 		    NULL, 0, mntopts, sizeof (mntopts)) != 0) {
6331 			(void) fprintf(stderr, gettext("mount failed: %s\n"),
6332 			    strerror(errno));
6333 			ret = 1;
6334 		}
6335 	} else {
6336 		(void) fprintf(stderr, gettext("filesystem '%s' cannot be "
6337 		    "mounted using 'mount -F zfs'\n"), dataset);
6338 		(void) fprintf(stderr, gettext("Use 'zfs set mountpoint=%s' "
6339 		    "instead.\n"), path);
6340 		(void) fprintf(stderr, gettext("If you must use 'mount -F zfs' "
6341 		    "or /etc/vfstab, use 'zfs set mountpoint=legacy'.\n"));
6342 		(void) fprintf(stderr, gettext("See zfs(1M) for more "
6343 		    "information.\n"));
6344 		ret = 1;
6345 	}
6346 
6347 	return (ret);
6348 }
6349 
6350 /*
6351  * Called when invoked as /etc/fs/zfs/umount.  Unlike a manual mount, we allow
6352  * unmounts of non-legacy filesystems, as this is the dominant administrative
6353  * interface.
6354  */
6355 static int
6356 manual_unmount(int argc, char **argv)
6357 {
6358 	int flags = 0;
6359 	int c;
6360 
6361 	/* check options */
6362 	while ((c = getopt(argc, argv, "f")) != -1) {
6363 		switch (c) {
6364 		case 'f':
6365 			flags = MS_FORCE;
6366 			break;
6367 		case '?':
6368 			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
6369 			    optopt);
6370 			(void) fprintf(stderr, gettext("usage: unmount [-f] "
6371 			    "<path>\n"));
6372 			return (2);
6373 		}
6374 	}
6375 
6376 	argc -= optind;
6377 	argv += optind;
6378 
6379 	/* check arguments */
6380 	if (argc != 1) {
6381 		if (argc == 0)
6382 			(void) fprintf(stderr, gettext("missing path "
6383 			    "argument\n"));
6384 		else
6385 			(void) fprintf(stderr, gettext("too many arguments\n"));
6386 		(void) fprintf(stderr, gettext("usage: unmount [-f] <path>\n"));
6387 		return (2);
6388 	}
6389 
6390 	return (unshare_unmount_path(OP_MOUNT, argv[0], flags, B_TRUE));
6391 }
6392 
6393 static int
6394 find_command_idx(char *command, int *idx)
6395 {
6396 	int i;
6397 
6398 	for (i = 0; i < NCOMMAND; i++) {
6399 		if (command_table[i].name == NULL)
6400 			continue;
6401 
6402 		if (strcmp(command, command_table[i].name) == 0) {
6403 			*idx = i;
6404 			return (0);
6405 		}
6406 	}
6407 	return (1);
6408 }
6409 
6410 static int
6411 zfs_do_diff(int argc, char **argv)
6412 {
6413 	zfs_handle_t *zhp;
6414 	int flags = 0;
6415 	char *tosnap = NULL;
6416 	char *fromsnap = NULL;
6417 	char *atp, *copy;
6418 	int err = 0;
6419 	int c;
6420 
6421 	while ((c = getopt(argc, argv, "FHt")) != -1) {
6422 		switch (c) {
6423 		case 'F':
6424 			flags |= ZFS_DIFF_CLASSIFY;
6425 			break;
6426 		case 'H':
6427 			flags |= ZFS_DIFF_PARSEABLE;
6428 			break;
6429 		case 't':
6430 			flags |= ZFS_DIFF_TIMESTAMP;
6431 			break;
6432 		default:
6433 			(void) fprintf(stderr,
6434 			    gettext("invalid option '%c'\n"), optopt);
6435 			usage(B_FALSE);
6436 		}
6437 	}
6438 
6439 	argc -= optind;
6440 	argv += optind;
6441 
6442 	if (argc < 1) {
6443 		(void) fprintf(stderr,
6444 		gettext("must provide at least one snapshot name\n"));
6445 		usage(B_FALSE);
6446 	}
6447 
6448 	if (argc > 2) {
6449 		(void) fprintf(stderr, gettext("too many arguments\n"));
6450 		usage(B_FALSE);
6451 	}
6452 
6453 	fromsnap = argv[0];
6454 	tosnap = (argc == 2) ? argv[1] : NULL;
6455 
6456 	copy = NULL;
6457 	if (*fromsnap != '@')
6458 		copy = strdup(fromsnap);
6459 	else if (tosnap)
6460 		copy = strdup(tosnap);
6461 	if (copy == NULL)
6462 		usage(B_FALSE);
6463 
6464 	if (atp = strchr(copy, '@'))
6465 		*atp = '\0';
6466 
6467 	if ((zhp = zfs_open(g_zfs, copy, ZFS_TYPE_FILESYSTEM)) == NULL)
6468 		return (1);
6469 
6470 	free(copy);
6471 
6472 	/*
6473 	 * Ignore SIGPIPE so that the library can give us
6474 	 * information on any failure
6475 	 */
6476 	(void) sigignore(SIGPIPE);
6477 
6478 	err = zfs_show_diffs(zhp, STDOUT_FILENO, fromsnap, tosnap, flags);
6479 
6480 	zfs_close(zhp);
6481 
6482 	return (err != 0);
6483 }
6484 
6485 int
6486 main(int argc, char **argv)
6487 {
6488 	int ret = 0;
6489 	int i;
6490 	char *progname;
6491 	char *cmdname;
6492 
6493 	(void) setlocale(LC_ALL, "");
6494 	(void) textdomain(TEXT_DOMAIN);
6495 
6496 	opterr = 0;
6497 
6498 	if ((g_zfs = libzfs_init()) == NULL) {
6499 		(void) fprintf(stderr, gettext("internal error: failed to "
6500 		    "initialize ZFS library\n"));
6501 		return (1);
6502 	}
6503 
6504 	zfs_save_arguments(argc, argv, history_str, sizeof (history_str));
6505 
6506 	libzfs_print_on_error(g_zfs, B_TRUE);
6507 
6508 	if ((mnttab_file = fopen(MNTTAB, "r")) == NULL) {
6509 		(void) fprintf(stderr, gettext("internal error: unable to "
6510 		    "open %s\n"), MNTTAB);
6511 		return (1);
6512 	}
6513 
6514 	/*
6515 	 * This command also doubles as the /etc/fs mount and unmount program.
6516 	 * Determine if we should take this behavior based on argv[0].
6517 	 */
6518 	progname = basename(argv[0]);
6519 	if (strcmp(progname, "mount") == 0) {
6520 		ret = manual_mount(argc, argv);
6521 	} else if (strcmp(progname, "umount") == 0) {
6522 		ret = manual_unmount(argc, argv);
6523 	} else {
6524 		/*
6525 		 * Make sure the user has specified some command.
6526 		 */
6527 		if (argc < 2) {
6528 			(void) fprintf(stderr, gettext("missing command\n"));
6529 			usage(B_FALSE);
6530 		}
6531 
6532 		cmdname = argv[1];
6533 
6534 		/*
6535 		 * The 'umount' command is an alias for 'unmount'
6536 		 */
6537 		if (strcmp(cmdname, "umount") == 0)
6538 			cmdname = "unmount";
6539 
6540 		/*
6541 		 * The 'recv' command is an alias for 'receive'
6542 		 */
6543 		if (strcmp(cmdname, "recv") == 0)
6544 			cmdname = "receive";
6545 
6546 		/*
6547 		 * Special case '-?'
6548 		 */
6549 		if (strcmp(cmdname, "-?") == 0)
6550 			usage(B_TRUE);
6551 
6552 		/*
6553 		 * Run the appropriate command.
6554 		 */
6555 		libzfs_mnttab_cache(g_zfs, B_TRUE);
6556 		if (find_command_idx(cmdname, &i) == 0) {
6557 			current_command = &command_table[i];
6558 			ret = command_table[i].func(argc - 1, argv + 1);
6559 		} else if (strchr(cmdname, '=') != NULL) {
6560 			verify(find_command_idx("set", &i) == 0);
6561 			current_command = &command_table[i];
6562 			ret = command_table[i].func(argc, argv);
6563 		} else {
6564 			(void) fprintf(stderr, gettext("unrecognized "
6565 			    "command '%s'\n"), cmdname);
6566 			usage(B_FALSE);
6567 		}
6568 		libzfs_mnttab_cache(g_zfs, B_FALSE);
6569 	}
6570 
6571 	(void) fclose(mnttab_file);
6572 
6573 	if (ret == 0 && log_history)
6574 		(void) zpool_log_history(g_zfs, history_str);
6575 
6576 	libzfs_fini(g_zfs);
6577 
6578 	/*
6579 	 * The 'ZFS_ABORT' environment variable causes us to dump core on exit
6580 	 * for the purposes of running ::findleaks.
6581 	 */
6582 	if (getenv("ZFS_ABORT") != NULL) {
6583 		(void) printf("dumping core by request\n");
6584 		abort();
6585 	}
6586 
6587 	return (ret);
6588 }
6589