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 2019 Joyent, Inc.
25  * Copyright (c) 2011, 2016 by Delphix. All rights reserved.
26  * Copyright (c) 2012 DEY Storage Systems, Inc.  All rights reserved.
27  * Copyright (c) 2011-2012 Pawel Jakub Dawidek. All rights reserved.
28  * Copyright (c) 2013 Martin Matuska. All rights reserved.
29  * Copyright (c) 2013 Steven Hartland. All rights reserved.
30  * Copyright (c) 2014 Integros [integros.com]
31  * Copyright 2017 Nexenta Systems, Inc.
32  * Copyright 2016 Igor Kozhukhov <ikozhukhov@gmail.com>
33  * Copyright 2017-2018 RackTop Systems.
34  */
35 
36 #include <ctype.h>
37 #include <errno.h>
38 #include <libintl.h>
39 #include <math.h>
40 #include <stdio.h>
41 #include <stdlib.h>
42 #include <strings.h>
43 #include <unistd.h>
44 #include <stddef.h>
45 #include <zone.h>
46 #include <fcntl.h>
47 #include <sys/mntent.h>
48 #include <sys/mount.h>
49 #include <priv.h>
50 #include <pwd.h>
51 #include <grp.h>
52 #include <stddef.h>
53 #include <ucred.h>
54 #include <idmap.h>
55 #include <aclutils.h>
56 #include <directory.h>
57 #include <time.h>
58 
59 #include <sys/dnode.h>
60 #include <sys/spa.h>
61 #include <sys/zap.h>
62 #include <sys/dsl_crypt.h>
63 #include <libzfs.h>
64 
65 #include "zfs_namecheck.h"
66 #include "zfs_prop.h"
67 #include "libzfs_impl.h"
68 #include "zfs_deleg.h"
69 
70 static int userquota_propname_decode(const char *propname, boolean_t zoned,
71     zfs_userquota_prop_t *typep, char *domain, int domainlen, uint64_t *ridp);
72 
73 /*
74  * Given a single type (not a mask of types), return the type in a human
75  * readable form.
76  */
77 const char *
78 zfs_type_to_name(zfs_type_t type)
79 {
80 	switch (type) {
81 	case ZFS_TYPE_FILESYSTEM:
82 		return (dgettext(TEXT_DOMAIN, "filesystem"));
83 	case ZFS_TYPE_SNAPSHOT:
84 		return (dgettext(TEXT_DOMAIN, "snapshot"));
85 	case ZFS_TYPE_VOLUME:
86 		return (dgettext(TEXT_DOMAIN, "volume"));
87 	case ZFS_TYPE_POOL:
88 		return (dgettext(TEXT_DOMAIN, "pool"));
89 	case ZFS_TYPE_BOOKMARK:
90 		return (dgettext(TEXT_DOMAIN, "bookmark"));
91 	default:
92 		assert(!"unhandled zfs_type_t");
93 	}
94 
95 	return (NULL);
96 }
97 
98 /*
99  * Validate a ZFS path.  This is used even before trying to open the dataset, to
100  * provide a more meaningful error message.  We call zfs_error_aux() to
101  * explain exactly why the name was not valid.
102  */
103 int
104 zfs_validate_name(libzfs_handle_t *hdl, const char *path, int type,
105     boolean_t modifying)
106 {
107 	namecheck_err_t why;
108 	char what;
109 
110 	if (entity_namecheck(path, &why, &what) != 0) {
111 		if (hdl != NULL) {
112 			switch (why) {
113 			case NAME_ERR_TOOLONG:
114 				zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
115 				    "name is too long"));
116 				break;
117 
118 			case NAME_ERR_LEADING_SLASH:
119 				zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
120 				    "leading slash in name"));
121 				break;
122 
123 			case NAME_ERR_EMPTY_COMPONENT:
124 				zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
125 				    "empty component in name"));
126 				break;
127 
128 			case NAME_ERR_TRAILING_SLASH:
129 				zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
130 				    "trailing slash in name"));
131 				break;
132 
133 			case NAME_ERR_INVALCHAR:
134 				zfs_error_aux(hdl,
135 				    dgettext(TEXT_DOMAIN, "invalid character "
136 				    "'%c' in name"), what);
137 				break;
138 
139 			case NAME_ERR_MULTIPLE_DELIMITERS:
140 				zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
141 				    "multiple '@' and/or '#' delimiters in "
142 				    "name"));
143 				break;
144 
145 			case NAME_ERR_NOLETTER:
146 				zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
147 				    "pool doesn't begin with a letter"));
148 				break;
149 
150 			case NAME_ERR_RESERVED:
151 				zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
152 				    "name is reserved"));
153 				break;
154 
155 			case NAME_ERR_DISKLIKE:
156 				zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
157 				    "reserved disk name"));
158 				break;
159 
160 			default:
161 				zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
162 				    "(%d) not defined"), why);
163 				break;
164 			}
165 		}
166 
167 		return (0);
168 	}
169 
170 	if (!(type & ZFS_TYPE_SNAPSHOT) && strchr(path, '@') != NULL) {
171 		if (hdl != NULL)
172 			zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
173 			    "snapshot delimiter '@' is not expected here"));
174 		return (0);
175 	}
176 
177 	if (type == ZFS_TYPE_SNAPSHOT && strchr(path, '@') == NULL) {
178 		if (hdl != NULL)
179 			zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
180 			    "missing '@' delimiter in snapshot name"));
181 		return (0);
182 	}
183 
184 	if (!(type & ZFS_TYPE_BOOKMARK) && strchr(path, '#') != NULL) {
185 		if (hdl != NULL)
186 			zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
187 			    "bookmark delimiter '#' is not expected here"));
188 		return (0);
189 	}
190 
191 	if (type == ZFS_TYPE_BOOKMARK && strchr(path, '#') == NULL) {
192 		if (hdl != NULL)
193 			zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
194 			    "missing '#' delimiter in bookmark name"));
195 		return (0);
196 	}
197 
198 	if (modifying && strchr(path, '%') != NULL) {
199 		if (hdl != NULL)
200 			zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
201 			    "invalid character %c in name"), '%');
202 		return (0);
203 	}
204 
205 	return (-1);
206 }
207 
208 int
209 zfs_name_valid(const char *name, zfs_type_t type)
210 {
211 	if (type == ZFS_TYPE_POOL)
212 		return (zpool_name_valid(NULL, B_FALSE, name));
213 	return (zfs_validate_name(NULL, name, type, B_FALSE));
214 }
215 
216 /*
217  * This function takes the raw DSL properties, and filters out the user-defined
218  * properties into a separate nvlist.
219  */
220 static nvlist_t *
221 process_user_props(zfs_handle_t *zhp, nvlist_t *props)
222 {
223 	libzfs_handle_t *hdl = zhp->zfs_hdl;
224 	nvpair_t *elem;
225 	nvlist_t *propval;
226 	nvlist_t *nvl;
227 
228 	if (nvlist_alloc(&nvl, NV_UNIQUE_NAME, 0) != 0) {
229 		(void) no_memory(hdl);
230 		return (NULL);
231 	}
232 
233 	elem = NULL;
234 	while ((elem = nvlist_next_nvpair(props, elem)) != NULL) {
235 		if (!zfs_prop_user(nvpair_name(elem)))
236 			continue;
237 
238 		verify(nvpair_value_nvlist(elem, &propval) == 0);
239 		if (nvlist_add_nvlist(nvl, nvpair_name(elem), propval) != 0) {
240 			nvlist_free(nvl);
241 			(void) no_memory(hdl);
242 			return (NULL);
243 		}
244 	}
245 
246 	return (nvl);
247 }
248 
249 static zpool_handle_t *
250 zpool_add_handle(zfs_handle_t *zhp, const char *pool_name)
251 {
252 	libzfs_handle_t *hdl = zhp->zfs_hdl;
253 	zpool_handle_t *zph;
254 
255 	if ((zph = zpool_open_canfail(hdl, pool_name)) != NULL) {
256 		if (hdl->libzfs_pool_handles != NULL)
257 			zph->zpool_next = hdl->libzfs_pool_handles;
258 		hdl->libzfs_pool_handles = zph;
259 	}
260 	return (zph);
261 }
262 
263 static zpool_handle_t *
264 zpool_find_handle(zfs_handle_t *zhp, const char *pool_name, int len)
265 {
266 	libzfs_handle_t *hdl = zhp->zfs_hdl;
267 	zpool_handle_t *zph = hdl->libzfs_pool_handles;
268 
269 	while ((zph != NULL) &&
270 	    (strncmp(pool_name, zpool_get_name(zph), len) != 0))
271 		zph = zph->zpool_next;
272 	return (zph);
273 }
274 
275 /*
276  * Returns a handle to the pool that contains the provided dataset.
277  * If a handle to that pool already exists then that handle is returned.
278  * Otherwise, a new handle is created and added to the list of handles.
279  */
280 static zpool_handle_t *
281 zpool_handle(zfs_handle_t *zhp)
282 {
283 	char *pool_name;
284 	int len;
285 	zpool_handle_t *zph;
286 
287 	len = strcspn(zhp->zfs_name, "/@#") + 1;
288 	pool_name = zfs_alloc(zhp->zfs_hdl, len);
289 	(void) strlcpy(pool_name, zhp->zfs_name, len);
290 
291 	zph = zpool_find_handle(zhp, pool_name, len);
292 	if (zph == NULL)
293 		zph = zpool_add_handle(zhp, pool_name);
294 
295 	free(pool_name);
296 	return (zph);
297 }
298 
299 void
300 zpool_free_handles(libzfs_handle_t *hdl)
301 {
302 	zpool_handle_t *next, *zph = hdl->libzfs_pool_handles;
303 
304 	while (zph != NULL) {
305 		next = zph->zpool_next;
306 		zpool_close(zph);
307 		zph = next;
308 	}
309 	hdl->libzfs_pool_handles = NULL;
310 }
311 
312 /*
313  * Utility function to gather stats (objset and zpl) for the given object.
314  */
315 static int
316 get_stats_ioctl(zfs_handle_t *zhp, zfs_cmd_t *zc)
317 {
318 	libzfs_handle_t *hdl = zhp->zfs_hdl;
319 
320 	(void) strlcpy(zc->zc_name, zhp->zfs_name, sizeof (zc->zc_name));
321 
322 	while (ioctl(hdl->libzfs_fd, ZFS_IOC_OBJSET_STATS, zc) != 0) {
323 		if (errno == ENOMEM) {
324 			if (zcmd_expand_dst_nvlist(hdl, zc) != 0) {
325 				return (-1);
326 			}
327 		} else {
328 			return (-1);
329 		}
330 	}
331 	return (0);
332 }
333 
334 /*
335  * Utility function to get the received properties of the given object.
336  */
337 static int
338 get_recvd_props_ioctl(zfs_handle_t *zhp)
339 {
340 	libzfs_handle_t *hdl = zhp->zfs_hdl;
341 	nvlist_t *recvdprops;
342 	zfs_cmd_t zc = { 0 };
343 	int err;
344 
345 	if (zcmd_alloc_dst_nvlist(hdl, &zc, 0) != 0)
346 		return (-1);
347 
348 	(void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));
349 
350 	while (ioctl(hdl->libzfs_fd, ZFS_IOC_OBJSET_RECVD_PROPS, &zc) != 0) {
351 		if (errno == ENOMEM) {
352 			if (zcmd_expand_dst_nvlist(hdl, &zc) != 0) {
353 				return (-1);
354 			}
355 		} else {
356 			zcmd_free_nvlists(&zc);
357 			return (-1);
358 		}
359 	}
360 
361 	err = zcmd_read_dst_nvlist(zhp->zfs_hdl, &zc, &recvdprops);
362 	zcmd_free_nvlists(&zc);
363 	if (err != 0)
364 		return (-1);
365 
366 	nvlist_free(zhp->zfs_recvd_props);
367 	zhp->zfs_recvd_props = recvdprops;
368 
369 	return (0);
370 }
371 
372 static int
373 put_stats_zhdl(zfs_handle_t *zhp, zfs_cmd_t *zc)
374 {
375 	nvlist_t *allprops, *userprops;
376 
377 	zhp->zfs_dmustats = zc->zc_objset_stats; /* structure assignment */
378 
379 	if (zcmd_read_dst_nvlist(zhp->zfs_hdl, zc, &allprops) != 0) {
380 		return (-1);
381 	}
382 
383 	/*
384 	 * XXX Why do we store the user props separately, in addition to
385 	 * storing them in zfs_props?
386 	 */
387 	if ((userprops = process_user_props(zhp, allprops)) == NULL) {
388 		nvlist_free(allprops);
389 		return (-1);
390 	}
391 
392 	nvlist_free(zhp->zfs_props);
393 	nvlist_free(zhp->zfs_user_props);
394 
395 	zhp->zfs_props = allprops;
396 	zhp->zfs_user_props = userprops;
397 
398 	return (0);
399 }
400 
401 static int
402 get_stats(zfs_handle_t *zhp)
403 {
404 	int rc = 0;
405 	zfs_cmd_t zc = { 0 };
406 
407 	if (zcmd_alloc_dst_nvlist(zhp->zfs_hdl, &zc, 0) != 0)
408 		return (-1);
409 	if (get_stats_ioctl(zhp, &zc) != 0)
410 		rc = -1;
411 	else if (put_stats_zhdl(zhp, &zc) != 0)
412 		rc = -1;
413 	zcmd_free_nvlists(&zc);
414 	return (rc);
415 }
416 
417 /*
418  * Refresh the properties currently stored in the handle.
419  */
420 void
421 zfs_refresh_properties(zfs_handle_t *zhp)
422 {
423 	(void) get_stats(zhp);
424 }
425 
426 /*
427  * Makes a handle from the given dataset name.  Used by zfs_open() and
428  * zfs_iter_* to create child handles on the fly.
429  */
430 static int
431 make_dataset_handle_common(zfs_handle_t *zhp, zfs_cmd_t *zc)
432 {
433 	if (put_stats_zhdl(zhp, zc) != 0)
434 		return (-1);
435 
436 	/*
437 	 * We've managed to open the dataset and gather statistics.  Determine
438 	 * the high-level type.
439 	 */
440 	if (zhp->zfs_dmustats.dds_type == DMU_OST_ZVOL)
441 		zhp->zfs_head_type = ZFS_TYPE_VOLUME;
442 	else if (zhp->zfs_dmustats.dds_type == DMU_OST_ZFS)
443 		zhp->zfs_head_type = ZFS_TYPE_FILESYSTEM;
444 	else if (zhp->zfs_dmustats.dds_type == DMU_OST_OTHER)
445 		return (-1);
446 	else
447 		abort();
448 
449 	if (zhp->zfs_dmustats.dds_is_snapshot)
450 		zhp->zfs_type = ZFS_TYPE_SNAPSHOT;
451 	else if (zhp->zfs_dmustats.dds_type == DMU_OST_ZVOL)
452 		zhp->zfs_type = ZFS_TYPE_VOLUME;
453 	else if (zhp->zfs_dmustats.dds_type == DMU_OST_ZFS)
454 		zhp->zfs_type = ZFS_TYPE_FILESYSTEM;
455 	else
456 		abort();	/* we should never see any other types */
457 
458 	if ((zhp->zpool_hdl = zpool_handle(zhp)) == NULL)
459 		return (-1);
460 
461 	return (0);
462 }
463 
464 zfs_handle_t *
465 make_dataset_handle(libzfs_handle_t *hdl, const char *path)
466 {
467 	zfs_cmd_t zc = { 0 };
468 
469 	zfs_handle_t *zhp = calloc(sizeof (zfs_handle_t), 1);
470 
471 	if (zhp == NULL)
472 		return (NULL);
473 
474 	zhp->zfs_hdl = hdl;
475 	(void) strlcpy(zhp->zfs_name, path, sizeof (zhp->zfs_name));
476 	if (zcmd_alloc_dst_nvlist(hdl, &zc, 0) != 0) {
477 		free(zhp);
478 		return (NULL);
479 	}
480 	if (get_stats_ioctl(zhp, &zc) == -1) {
481 		zcmd_free_nvlists(&zc);
482 		free(zhp);
483 		return (NULL);
484 	}
485 	if (make_dataset_handle_common(zhp, &zc) == -1) {
486 		free(zhp);
487 		zhp = NULL;
488 	}
489 	zcmd_free_nvlists(&zc);
490 	return (zhp);
491 }
492 
493 zfs_handle_t *
494 make_dataset_handle_zc(libzfs_handle_t *hdl, zfs_cmd_t *zc)
495 {
496 	zfs_handle_t *zhp = calloc(sizeof (zfs_handle_t), 1);
497 
498 	if (zhp == NULL)
499 		return (NULL);
500 
501 	zhp->zfs_hdl = hdl;
502 	(void) strlcpy(zhp->zfs_name, zc->zc_name, sizeof (zhp->zfs_name));
503 	if (make_dataset_handle_common(zhp, zc) == -1) {
504 		free(zhp);
505 		return (NULL);
506 	}
507 	return (zhp);
508 }
509 
510 zfs_handle_t *
511 make_dataset_simple_handle_zc(zfs_handle_t *pzhp, zfs_cmd_t *zc)
512 {
513 	zfs_handle_t *zhp = calloc(sizeof (zfs_handle_t), 1);
514 
515 	if (zhp == NULL)
516 		return (NULL);
517 
518 	zhp->zfs_hdl = pzhp->zfs_hdl;
519 	(void) strlcpy(zhp->zfs_name, zc->zc_name, sizeof (zhp->zfs_name));
520 	zhp->zfs_head_type = pzhp->zfs_type;
521 	zhp->zfs_type = ZFS_TYPE_SNAPSHOT;
522 	zhp->zpool_hdl = zpool_handle(zhp);
523 	return (zhp);
524 }
525 
526 zfs_handle_t *
527 zfs_handle_dup(zfs_handle_t *zhp_orig)
528 {
529 	zfs_handle_t *zhp = calloc(sizeof (zfs_handle_t), 1);
530 
531 	if (zhp == NULL)
532 		return (NULL);
533 
534 	zhp->zfs_hdl = zhp_orig->zfs_hdl;
535 	zhp->zpool_hdl = zhp_orig->zpool_hdl;
536 	(void) strlcpy(zhp->zfs_name, zhp_orig->zfs_name,
537 	    sizeof (zhp->zfs_name));
538 	zhp->zfs_type = zhp_orig->zfs_type;
539 	zhp->zfs_head_type = zhp_orig->zfs_head_type;
540 	zhp->zfs_dmustats = zhp_orig->zfs_dmustats;
541 	if (zhp_orig->zfs_props != NULL) {
542 		if (nvlist_dup(zhp_orig->zfs_props, &zhp->zfs_props, 0) != 0) {
543 			(void) no_memory(zhp->zfs_hdl);
544 			zfs_close(zhp);
545 			return (NULL);
546 		}
547 	}
548 	if (zhp_orig->zfs_user_props != NULL) {
549 		if (nvlist_dup(zhp_orig->zfs_user_props,
550 		    &zhp->zfs_user_props, 0) != 0) {
551 			(void) no_memory(zhp->zfs_hdl);
552 			zfs_close(zhp);
553 			return (NULL);
554 		}
555 	}
556 	if (zhp_orig->zfs_recvd_props != NULL) {
557 		if (nvlist_dup(zhp_orig->zfs_recvd_props,
558 		    &zhp->zfs_recvd_props, 0)) {
559 			(void) no_memory(zhp->zfs_hdl);
560 			zfs_close(zhp);
561 			return (NULL);
562 		}
563 	}
564 	zhp->zfs_mntcheck = zhp_orig->zfs_mntcheck;
565 	if (zhp_orig->zfs_mntopts != NULL) {
566 		zhp->zfs_mntopts = zfs_strdup(zhp_orig->zfs_hdl,
567 		    zhp_orig->zfs_mntopts);
568 	}
569 	zhp->zfs_props_table = zhp_orig->zfs_props_table;
570 	return (zhp);
571 }
572 
573 boolean_t
574 zfs_bookmark_exists(const char *path)
575 {
576 	nvlist_t *bmarks;
577 	nvlist_t *props;
578 	char fsname[ZFS_MAX_DATASET_NAME_LEN];
579 	char *bmark_name;
580 	char *pound;
581 	int err;
582 	boolean_t rv;
583 
584 
585 	(void) strlcpy(fsname, path, sizeof (fsname));
586 	pound = strchr(fsname, '#');
587 	if (pound == NULL)
588 		return (B_FALSE);
589 
590 	*pound = '\0';
591 	bmark_name = pound + 1;
592 	props = fnvlist_alloc();
593 	err = lzc_get_bookmarks(fsname, props, &bmarks);
594 	nvlist_free(props);
595 	if (err != 0) {
596 		nvlist_free(bmarks);
597 		return (B_FALSE);
598 	}
599 
600 	rv = nvlist_exists(bmarks, bmark_name);
601 	nvlist_free(bmarks);
602 	return (rv);
603 }
604 
605 zfs_handle_t *
606 make_bookmark_handle(zfs_handle_t *parent, const char *path,
607     nvlist_t *bmark_props)
608 {
609 	zfs_handle_t *zhp = calloc(sizeof (zfs_handle_t), 1);
610 
611 	if (zhp == NULL)
612 		return (NULL);
613 
614 	/* Fill in the name. */
615 	zhp->zfs_hdl = parent->zfs_hdl;
616 	(void) strlcpy(zhp->zfs_name, path, sizeof (zhp->zfs_name));
617 
618 	/* Set the property lists. */
619 	if (nvlist_dup(bmark_props, &zhp->zfs_props, 0) != 0) {
620 		free(zhp);
621 		return (NULL);
622 	}
623 
624 	/* Set the types. */
625 	zhp->zfs_head_type = parent->zfs_head_type;
626 	zhp->zfs_type = ZFS_TYPE_BOOKMARK;
627 
628 	if ((zhp->zpool_hdl = zpool_handle(zhp)) == NULL) {
629 		nvlist_free(zhp->zfs_props);
630 		free(zhp);
631 		return (NULL);
632 	}
633 
634 	return (zhp);
635 }
636 
637 struct zfs_open_bookmarks_cb_data {
638 	const char *path;
639 	zfs_handle_t *zhp;
640 };
641 
642 static int
643 zfs_open_bookmarks_cb(zfs_handle_t *zhp, void *data)
644 {
645 	struct zfs_open_bookmarks_cb_data *dp = data;
646 
647 	/*
648 	 * Is it the one we are looking for?
649 	 */
650 	if (strcmp(dp->path, zfs_get_name(zhp)) == 0) {
651 		/*
652 		 * We found it.  Save it and let the caller know we are done.
653 		 */
654 		dp->zhp = zhp;
655 		return (EEXIST);
656 	}
657 
658 	/*
659 	 * Not found.  Close the handle and ask for another one.
660 	 */
661 	zfs_close(zhp);
662 	return (0);
663 }
664 
665 /*
666  * Opens the given snapshot, bookmark, filesystem, or volume.   The 'types'
667  * argument is a mask of acceptable types.  The function will print an
668  * appropriate error message and return NULL if it can't be opened.
669  */
670 zfs_handle_t *
671 zfs_open(libzfs_handle_t *hdl, const char *path, int types)
672 {
673 	zfs_handle_t *zhp;
674 	char errbuf[1024];
675 	char *bookp;
676 
677 	(void) snprintf(errbuf, sizeof (errbuf),
678 	    dgettext(TEXT_DOMAIN, "cannot open '%s'"), path);
679 
680 	/*
681 	 * Validate the name before we even try to open it.
682 	 */
683 	if (!zfs_validate_name(hdl, path, types, B_FALSE)) {
684 		(void) zfs_error(hdl, EZFS_INVALIDNAME, errbuf);
685 		return (NULL);
686 	}
687 
688 	/*
689 	 * Bookmarks needs to be handled separately.
690 	 */
691 	bookp = strchr(path, '#');
692 	if (bookp == NULL) {
693 		/*
694 		 * Try to get stats for the dataset, which will tell us if it
695 		 * exists.
696 		 */
697 		errno = 0;
698 		if ((zhp = make_dataset_handle(hdl, path)) == NULL) {
699 			(void) zfs_standard_error(hdl, errno, errbuf);
700 			return (NULL);
701 		}
702 	} else {
703 		char dsname[ZFS_MAX_DATASET_NAME_LEN];
704 		zfs_handle_t *pzhp;
705 		struct zfs_open_bookmarks_cb_data cb_data = {path, NULL};
706 
707 		/*
708 		 * We need to cut out '#' and everything after '#'
709 		 * to get the parent dataset name only.
710 		 */
711 		assert(bookp - path < sizeof (dsname));
712 		(void) strncpy(dsname, path, bookp - path);
713 		dsname[bookp - path] = '\0';
714 
715 		/*
716 		 * Create handle for the parent dataset.
717 		 */
718 		errno = 0;
719 		if ((pzhp = make_dataset_handle(hdl, dsname)) == NULL) {
720 			(void) zfs_standard_error(hdl, errno, errbuf);
721 			return (NULL);
722 		}
723 
724 		/*
725 		 * Iterate bookmarks to find the right one.
726 		 */
727 		errno = 0;
728 		if ((zfs_iter_bookmarks(pzhp, zfs_open_bookmarks_cb,
729 		    &cb_data) == 0) && (cb_data.zhp == NULL)) {
730 			(void) zfs_error(hdl, EZFS_NOENT, errbuf);
731 			zfs_close(pzhp);
732 			return (NULL);
733 		}
734 		if (cb_data.zhp == NULL) {
735 			(void) zfs_standard_error(hdl, errno, errbuf);
736 			zfs_close(pzhp);
737 			return (NULL);
738 		}
739 		zhp = cb_data.zhp;
740 
741 		/*
742 		 * Cleanup.
743 		 */
744 		zfs_close(pzhp);
745 	}
746 
747 	if (!(types & zhp->zfs_type)) {
748 		(void) zfs_error(hdl, EZFS_BADTYPE, errbuf);
749 		zfs_close(zhp);
750 		return (NULL);
751 	}
752 
753 	return (zhp);
754 }
755 
756 /*
757  * Release a ZFS handle.  Nothing to do but free the associated memory.
758  */
759 void
760 zfs_close(zfs_handle_t *zhp)
761 {
762 	if (zhp->zfs_mntopts)
763 		free(zhp->zfs_mntopts);
764 	nvlist_free(zhp->zfs_props);
765 	nvlist_free(zhp->zfs_user_props);
766 	nvlist_free(zhp->zfs_recvd_props);
767 	free(zhp);
768 }
769 
770 typedef struct mnttab_node {
771 	struct mnttab mtn_mt;
772 	avl_node_t mtn_node;
773 } mnttab_node_t;
774 
775 static int
776 libzfs_mnttab_cache_compare(const void *arg1, const void *arg2)
777 {
778 	const mnttab_node_t *mtn1 = (const mnttab_node_t *)arg1;
779 	const mnttab_node_t *mtn2 = (const mnttab_node_t *)arg2;
780 	int rv;
781 
782 	rv = strcmp(mtn1->mtn_mt.mnt_special, mtn2->mtn_mt.mnt_special);
783 
784 	if (rv == 0)
785 		return (0);
786 	return (rv > 0 ? 1 : -1);
787 }
788 
789 void
790 libzfs_mnttab_init(libzfs_handle_t *hdl)
791 {
792 	(void) mutex_init(&hdl->libzfs_mnttab_cache_lock,
793 	    LOCK_NORMAL | LOCK_ERRORCHECK, NULL);
794 	assert(avl_numnodes(&hdl->libzfs_mnttab_cache) == 0);
795 	avl_create(&hdl->libzfs_mnttab_cache, libzfs_mnttab_cache_compare,
796 	    sizeof (mnttab_node_t), offsetof(mnttab_node_t, mtn_node));
797 }
798 
799 void
800 libzfs_mnttab_update(libzfs_handle_t *hdl)
801 {
802 	struct mnttab entry;
803 
804 	rewind(hdl->libzfs_mnttab);
805 	while (getmntent(hdl->libzfs_mnttab, &entry) == 0) {
806 		mnttab_node_t *mtn;
807 
808 		if (strcmp(entry.mnt_fstype, MNTTYPE_ZFS) != 0)
809 			continue;
810 		mtn = zfs_alloc(hdl, sizeof (mnttab_node_t));
811 		mtn->mtn_mt.mnt_special = zfs_strdup(hdl, entry.mnt_special);
812 		mtn->mtn_mt.mnt_mountp = zfs_strdup(hdl, entry.mnt_mountp);
813 		mtn->mtn_mt.mnt_fstype = zfs_strdup(hdl, entry.mnt_fstype);
814 		mtn->mtn_mt.mnt_mntopts = zfs_strdup(hdl, entry.mnt_mntopts);
815 		avl_add(&hdl->libzfs_mnttab_cache, mtn);
816 	}
817 }
818 
819 void
820 libzfs_mnttab_fini(libzfs_handle_t *hdl)
821 {
822 	void *cookie = NULL;
823 	mnttab_node_t *mtn;
824 
825 	while ((mtn = avl_destroy_nodes(&hdl->libzfs_mnttab_cache, &cookie))
826 	    != NULL) {
827 		free(mtn->mtn_mt.mnt_special);
828 		free(mtn->mtn_mt.mnt_mountp);
829 		free(mtn->mtn_mt.mnt_fstype);
830 		free(mtn->mtn_mt.mnt_mntopts);
831 		free(mtn);
832 	}
833 	avl_destroy(&hdl->libzfs_mnttab_cache);
834 	(void) mutex_destroy(&hdl->libzfs_mnttab_cache_lock);
835 }
836 
837 void
838 libzfs_mnttab_cache(libzfs_handle_t *hdl, boolean_t enable)
839 {
840 	hdl->libzfs_mnttab_enable = enable;
841 }
842 
843 int
844 libzfs_mnttab_find(libzfs_handle_t *hdl, const char *fsname,
845     struct mnttab *entry)
846 {
847 	mnttab_node_t find;
848 	mnttab_node_t *mtn;
849 	int ret = ENOENT;
850 
851 	if (!hdl->libzfs_mnttab_enable) {
852 		struct mnttab srch = { 0 };
853 
854 		if (avl_numnodes(&hdl->libzfs_mnttab_cache))
855 			libzfs_mnttab_fini(hdl);
856 		rewind(hdl->libzfs_mnttab);
857 		srch.mnt_special = (char *)fsname;
858 		srch.mnt_fstype = MNTTYPE_ZFS;
859 		if (getmntany(hdl->libzfs_mnttab, entry, &srch) == 0)
860 			return (0);
861 		else
862 			return (ENOENT);
863 	}
864 
865 	mutex_enter(&hdl->libzfs_mnttab_cache_lock);
866 	if (avl_numnodes(&hdl->libzfs_mnttab_cache) == 0)
867 		libzfs_mnttab_update(hdl);
868 
869 	find.mtn_mt.mnt_special = (char *)fsname;
870 	mtn = avl_find(&hdl->libzfs_mnttab_cache, &find, NULL);
871 	if (mtn) {
872 		*entry = mtn->mtn_mt;
873 		ret = 0;
874 	}
875 	mutex_exit(&hdl->libzfs_mnttab_cache_lock);
876 	return (ret);
877 }
878 
879 void
880 libzfs_mnttab_add(libzfs_handle_t *hdl, const char *special,
881     const char *mountp, const char *mntopts)
882 {
883 	mnttab_node_t *mtn;
884 
885 	mutex_enter(&hdl->libzfs_mnttab_cache_lock);
886 	if (avl_numnodes(&hdl->libzfs_mnttab_cache) != 0) {
887 		mtn = zfs_alloc(hdl, sizeof (mnttab_node_t));
888 		mtn->mtn_mt.mnt_special = zfs_strdup(hdl, special);
889 		mtn->mtn_mt.mnt_mountp = zfs_strdup(hdl, mountp);
890 		mtn->mtn_mt.mnt_fstype = zfs_strdup(hdl, MNTTYPE_ZFS);
891 		mtn->mtn_mt.mnt_mntopts = zfs_strdup(hdl, mntopts);
892 		avl_add(&hdl->libzfs_mnttab_cache, mtn);
893 	}
894 	mutex_exit(&hdl->libzfs_mnttab_cache_lock);
895 }
896 
897 void
898 libzfs_mnttab_remove(libzfs_handle_t *hdl, const char *fsname)
899 {
900 	mnttab_node_t find;
901 	mnttab_node_t *ret;
902 
903 	mutex_enter(&hdl->libzfs_mnttab_cache_lock);
904 	find.mtn_mt.mnt_special = (char *)fsname;
905 	if ((ret = avl_find(&hdl->libzfs_mnttab_cache, (void *)&find, NULL))
906 	    != NULL) {
907 		avl_remove(&hdl->libzfs_mnttab_cache, ret);
908 		free(ret->mtn_mt.mnt_special);
909 		free(ret->mtn_mt.mnt_mountp);
910 		free(ret->mtn_mt.mnt_fstype);
911 		free(ret->mtn_mt.mnt_mntopts);
912 		free(ret);
913 	}
914 	mutex_exit(&hdl->libzfs_mnttab_cache_lock);
915 }
916 
917 int
918 zfs_spa_version(zfs_handle_t *zhp, int *spa_version)
919 {
920 	zpool_handle_t *zpool_handle = zhp->zpool_hdl;
921 
922 	if (zpool_handle == NULL)
923 		return (-1);
924 
925 	*spa_version = zpool_get_prop_int(zpool_handle,
926 	    ZPOOL_PROP_VERSION, NULL);
927 	return (0);
928 }
929 
930 /*
931  * The choice of reservation property depends on the SPA version.
932  */
933 static int
934 zfs_which_resv_prop(zfs_handle_t *zhp, zfs_prop_t *resv_prop)
935 {
936 	int spa_version;
937 
938 	if (zfs_spa_version(zhp, &spa_version) < 0)
939 		return (-1);
940 
941 	if (spa_version >= SPA_VERSION_REFRESERVATION)
942 		*resv_prop = ZFS_PROP_REFRESERVATION;
943 	else
944 		*resv_prop = ZFS_PROP_RESERVATION;
945 
946 	return (0);
947 }
948 
949 /*
950  * Given an nvlist of properties to set, validates that they are correct, and
951  * parses any numeric properties (index, boolean, etc) if they are specified as
952  * strings.
953  */
954 nvlist_t *
955 zfs_valid_proplist(libzfs_handle_t *hdl, zfs_type_t type, nvlist_t *nvl,
956     uint64_t zoned, zfs_handle_t *zhp, zpool_handle_t *zpool_hdl,
957     boolean_t key_params_ok, const char *errbuf)
958 {
959 	nvpair_t *elem;
960 	uint64_t intval;
961 	char *strval;
962 	zfs_prop_t prop;
963 	nvlist_t *ret;
964 	int chosen_normal = -1;
965 	int chosen_utf = -1;
966 
967 	if (nvlist_alloc(&ret, NV_UNIQUE_NAME, 0) != 0) {
968 		(void) no_memory(hdl);
969 		return (NULL);
970 	}
971 
972 	/*
973 	 * Make sure this property is valid and applies to this type.
974 	 */
975 
976 	elem = NULL;
977 	while ((elem = nvlist_next_nvpair(nvl, elem)) != NULL) {
978 		const char *propname = nvpair_name(elem);
979 
980 		prop = zfs_name_to_prop(propname);
981 		if (prop == ZPROP_INVAL && zfs_prop_user(propname)) {
982 			/*
983 			 * This is a user property: make sure it's a
984 			 * string, and that it's less than ZAP_MAXNAMELEN.
985 			 */
986 			if (nvpair_type(elem) != DATA_TYPE_STRING) {
987 				zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
988 				    "'%s' must be a string"), propname);
989 				(void) zfs_error(hdl, EZFS_BADPROP, errbuf);
990 				goto error;
991 			}
992 
993 			if (strlen(nvpair_name(elem)) >= ZAP_MAXNAMELEN) {
994 				zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
995 				    "property name '%s' is too long"),
996 				    propname);
997 				(void) zfs_error(hdl, EZFS_BADPROP, errbuf);
998 				goto error;
999 			}
1000 
1001 			(void) nvpair_value_string(elem, &strval);
1002 			if (nvlist_add_string(ret, propname, strval) != 0) {
1003 				(void) no_memory(hdl);
1004 				goto error;
1005 			}
1006 			continue;
1007 		}
1008 
1009 		/*
1010 		 * Currently, only user properties can be modified on
1011 		 * snapshots.
1012 		 */
1013 		if (type == ZFS_TYPE_SNAPSHOT) {
1014 			zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1015 			    "this property can not be modified for snapshots"));
1016 			(void) zfs_error(hdl, EZFS_PROPTYPE, errbuf);
1017 			goto error;
1018 		}
1019 
1020 		if (prop == ZPROP_INVAL && zfs_prop_userquota(propname)) {
1021 			zfs_userquota_prop_t uqtype;
1022 			char newpropname[128];
1023 			char domain[128];
1024 			uint64_t rid;
1025 			uint64_t valary[3];
1026 
1027 			if (userquota_propname_decode(propname, zoned,
1028 			    &uqtype, domain, sizeof (domain), &rid) != 0) {
1029 				zfs_error_aux(hdl,
1030 				    dgettext(TEXT_DOMAIN,
1031 				    "'%s' has an invalid user/group name"),
1032 				    propname);
1033 				(void) zfs_error(hdl, EZFS_BADPROP, errbuf);
1034 				goto error;
1035 			}
1036 
1037 			if (uqtype != ZFS_PROP_USERQUOTA &&
1038 			    uqtype != ZFS_PROP_GROUPQUOTA &&
1039 			    uqtype != ZFS_PROP_USEROBJQUOTA &&
1040 			    uqtype != ZFS_PROP_GROUPOBJQUOTA &&
1041 			    uqtype != ZFS_PROP_PROJECTQUOTA &&
1042 			    uqtype != ZFS_PROP_PROJECTOBJQUOTA) {
1043 				zfs_error_aux(hdl,
1044 				    dgettext(TEXT_DOMAIN, "'%s' is readonly"),
1045 				    propname);
1046 				(void) zfs_error(hdl, EZFS_PROPREADONLY,
1047 				    errbuf);
1048 				goto error;
1049 			}
1050 
1051 			if (nvpair_type(elem) == DATA_TYPE_STRING) {
1052 				(void) nvpair_value_string(elem, &strval);
1053 				if (strcmp(strval, "none") == 0) {
1054 					intval = 0;
1055 				} else if (zfs_nicestrtonum(hdl,
1056 				    strval, &intval) != 0) {
1057 					(void) zfs_error(hdl,
1058 					    EZFS_BADPROP, errbuf);
1059 					goto error;
1060 				}
1061 			} else if (nvpair_type(elem) ==
1062 			    DATA_TYPE_UINT64) {
1063 				(void) nvpair_value_uint64(elem, &intval);
1064 				if (intval == 0) {
1065 					zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1066 					    "use 'none' to disable "
1067 					    "{user|group|project}quota"));
1068 					goto error;
1069 				}
1070 			} else {
1071 				zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1072 				    "'%s' must be a number"), propname);
1073 				(void) zfs_error(hdl, EZFS_BADPROP, errbuf);
1074 				goto error;
1075 			}
1076 
1077 			/*
1078 			 * Encode the prop name as
1079 			 * userquota@<hex-rid>-domain, to make it easy
1080 			 * for the kernel to decode.
1081 			 */
1082 			(void) snprintf(newpropname, sizeof (newpropname),
1083 			    "%s%llx-%s", zfs_userquota_prop_prefixes[uqtype],
1084 			    (longlong_t)rid, domain);
1085 			valary[0] = uqtype;
1086 			valary[1] = rid;
1087 			valary[2] = intval;
1088 			if (nvlist_add_uint64_array(ret, newpropname,
1089 			    valary, 3) != 0) {
1090 				(void) no_memory(hdl);
1091 				goto error;
1092 			}
1093 			continue;
1094 		} else if (prop == ZPROP_INVAL && zfs_prop_written(propname)) {
1095 			zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1096 			    "'%s' is readonly"),
1097 			    propname);
1098 			(void) zfs_error(hdl, EZFS_PROPREADONLY, errbuf);
1099 			goto error;
1100 		}
1101 
1102 		if (prop == ZPROP_INVAL) {
1103 			zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1104 			    "invalid property '%s'"), propname);
1105 			(void) zfs_error(hdl, EZFS_BADPROP, errbuf);
1106 			goto error;
1107 		}
1108 
1109 		if (!zfs_prop_valid_for_type(prop, type)) {
1110 			zfs_error_aux(hdl,
1111 			    dgettext(TEXT_DOMAIN, "'%s' does not "
1112 			    "apply to datasets of this type"), propname);
1113 			(void) zfs_error(hdl, EZFS_PROPTYPE, errbuf);
1114 			goto error;
1115 		}
1116 
1117 		if (zfs_prop_readonly(prop) &&
1118 		    !(zfs_prop_setonce(prop) && zhp == NULL) &&
1119 		    !(zfs_prop_encryption_key_param(prop) && key_params_ok)) {
1120 			zfs_error_aux(hdl,
1121 			    dgettext(TEXT_DOMAIN, "'%s' is readonly"),
1122 			    propname);
1123 			(void) zfs_error(hdl, EZFS_PROPREADONLY, errbuf);
1124 			goto error;
1125 		}
1126 
1127 		if (zprop_parse_value(hdl, elem, prop, type, ret,
1128 		    &strval, &intval, errbuf) != 0)
1129 			goto error;
1130 
1131 		/*
1132 		 * Perform some additional checks for specific properties.
1133 		 */
1134 		switch (prop) {
1135 		case ZFS_PROP_VERSION:
1136 		{
1137 			int version;
1138 
1139 			if (zhp == NULL)
1140 				break;
1141 			version = zfs_prop_get_int(zhp, ZFS_PROP_VERSION);
1142 			if (intval < version) {
1143 				zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1144 				    "Can not downgrade; already at version %u"),
1145 				    version);
1146 				(void) zfs_error(hdl, EZFS_BADPROP, errbuf);
1147 				goto error;
1148 			}
1149 			break;
1150 		}
1151 
1152 		case ZFS_PROP_VOLBLOCKSIZE:
1153 		case ZFS_PROP_RECORDSIZE:
1154 		{
1155 			int maxbs = SPA_MAXBLOCKSIZE;
1156 			if (zpool_hdl != NULL) {
1157 				maxbs = zpool_get_prop_int(zpool_hdl,
1158 				    ZPOOL_PROP_MAXBLOCKSIZE, NULL);
1159 			}
1160 			/*
1161 			 * Volumes are limited to a volblocksize of 128KB,
1162 			 * because they typically service workloads with
1163 			 * small random writes, which incur a large performance
1164 			 * penalty with large blocks.
1165 			 */
1166 			if (prop == ZFS_PROP_VOLBLOCKSIZE)
1167 				maxbs = SPA_OLD_MAXBLOCKSIZE;
1168 			/*
1169 			 * The value must be a power of two between
1170 			 * SPA_MINBLOCKSIZE and maxbs.
1171 			 */
1172 			if (intval < SPA_MINBLOCKSIZE ||
1173 			    intval > maxbs || !ISP2(intval)) {
1174 				zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1175 				    "'%s' must be power of 2 from 512B "
1176 				    "to %uKB"), propname, maxbs >> 10);
1177 				(void) zfs_error(hdl, EZFS_BADPROP, errbuf);
1178 				goto error;
1179 			}
1180 			break;
1181 		}
1182 
1183 		case ZFS_PROP_SPECIAL_SMALL_BLOCKS:
1184 			if (zpool_hdl != NULL) {
1185 				char state[64] = "";
1186 
1187 				/*
1188 				 * Issue a warning but do not fail so that
1189 				 * tests for setable properties succeed.
1190 				 */
1191 				if (zpool_prop_get_feature(zpool_hdl,
1192 				    "feature@allocation_classes", state,
1193 				    sizeof (state)) != 0 ||
1194 				    strcmp(state, ZFS_FEATURE_ACTIVE) != 0) {
1195 					(void) fprintf(stderr, gettext(
1196 					    "%s: property requires a special "
1197 					    "device in the pool\n"), propname);
1198 				}
1199 			}
1200 			if (intval != 0 &&
1201 			    (intval < SPA_MINBLOCKSIZE ||
1202 			    intval > SPA_OLD_MAXBLOCKSIZE || !ISP2(intval))) {
1203 				zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1204 				    "invalid '%s=%d' property: must be zero or "
1205 				    "a power of 2 from 512B to 128K"), propname,
1206 				    intval);
1207 				(void) zfs_error(hdl, EZFS_BADPROP, errbuf);
1208 				goto error;
1209 			}
1210 			break;
1211 
1212 		case ZFS_PROP_MLSLABEL:
1213 		{
1214 			/*
1215 			 * Verify the mlslabel string and convert to
1216 			 * internal hex label string.
1217 			 */
1218 
1219 			m_label_t *new_sl;
1220 			char *hex = NULL;	/* internal label string */
1221 
1222 			/* Default value is already OK. */
1223 			if (strcasecmp(strval, ZFS_MLSLABEL_DEFAULT) == 0)
1224 				break;
1225 
1226 			/* Verify the label can be converted to binary form */
1227 			if (((new_sl = m_label_alloc(MAC_LABEL)) == NULL) ||
1228 			    (str_to_label(strval, &new_sl, MAC_LABEL,
1229 			    L_NO_CORRECTION, NULL) == -1)) {
1230 				goto badlabel;
1231 			}
1232 
1233 			/* Now translate to hex internal label string */
1234 			if (label_to_str(new_sl, &hex, M_INTERNAL,
1235 			    DEF_NAMES) != 0) {
1236 				if (hex)
1237 					free(hex);
1238 				goto badlabel;
1239 			}
1240 			m_label_free(new_sl);
1241 
1242 			/* If string is already in internal form, we're done. */
1243 			if (strcmp(strval, hex) == 0) {
1244 				free(hex);
1245 				break;
1246 			}
1247 
1248 			/* Replace the label string with the internal form. */
1249 			(void) nvlist_remove(ret, zfs_prop_to_name(prop),
1250 			    DATA_TYPE_STRING);
1251 			verify(nvlist_add_string(ret, zfs_prop_to_name(prop),
1252 			    hex) == 0);
1253 			free(hex);
1254 
1255 			break;
1256 
1257 badlabel:
1258 			zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1259 			    "invalid mlslabel '%s'"), strval);
1260 			(void) zfs_error(hdl, EZFS_BADPROP, errbuf);
1261 			m_label_free(new_sl);	/* OK if null */
1262 			goto error;
1263 
1264 		}
1265 
1266 		case ZFS_PROP_MOUNTPOINT:
1267 		{
1268 			namecheck_err_t why;
1269 
1270 			if (strcmp(strval, ZFS_MOUNTPOINT_NONE) == 0 ||
1271 			    strcmp(strval, ZFS_MOUNTPOINT_LEGACY) == 0)
1272 				break;
1273 
1274 			if (mountpoint_namecheck(strval, &why)) {
1275 				switch (why) {
1276 				case NAME_ERR_LEADING_SLASH:
1277 					zfs_error_aux(hdl,
1278 					    dgettext(TEXT_DOMAIN,
1279 					    "'%s' must be an absolute path, "
1280 					    "'none', or 'legacy'"), propname);
1281 					break;
1282 				case NAME_ERR_TOOLONG:
1283 					zfs_error_aux(hdl,
1284 					    dgettext(TEXT_DOMAIN,
1285 					    "component of '%s' is too long"),
1286 					    propname);
1287 					break;
1288 
1289 				default:
1290 					zfs_error_aux(hdl,
1291 					    dgettext(TEXT_DOMAIN,
1292 					    "(%d) not defined"),
1293 					    why);
1294 					break;
1295 				}
1296 				(void) zfs_error(hdl, EZFS_BADPROP, errbuf);
1297 				goto error;
1298 			}
1299 		}
1300 
1301 			/*FALLTHRU*/
1302 
1303 		case ZFS_PROP_SHARESMB:
1304 		case ZFS_PROP_SHARENFS:
1305 			/*
1306 			 * For the mountpoint and sharenfs or sharesmb
1307 			 * properties, check if it can be set in a
1308 			 * global/non-global zone based on
1309 			 * the zoned property value:
1310 			 *
1311 			 *		global zone	    non-global zone
1312 			 * --------------------------------------------------
1313 			 * zoned=on	mountpoint (no)	    mountpoint (yes)
1314 			 *		sharenfs (no)	    sharenfs (no)
1315 			 *		sharesmb (no)	    sharesmb (no)
1316 			 *
1317 			 * zoned=off	mountpoint (yes)	N/A
1318 			 *		sharenfs (yes)
1319 			 *		sharesmb (yes)
1320 			 */
1321 			if (zoned) {
1322 				if (getzoneid() == GLOBAL_ZONEID) {
1323 					zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1324 					    "'%s' cannot be set on "
1325 					    "dataset in a non-global zone"),
1326 					    propname);
1327 					(void) zfs_error(hdl, EZFS_ZONED,
1328 					    errbuf);
1329 					goto error;
1330 				} else if (prop == ZFS_PROP_SHARENFS ||
1331 				    prop == ZFS_PROP_SHARESMB) {
1332 					zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1333 					    "'%s' cannot be set in "
1334 					    "a non-global zone"), propname);
1335 					(void) zfs_error(hdl, EZFS_ZONED,
1336 					    errbuf);
1337 					goto error;
1338 				}
1339 			} else if (getzoneid() != GLOBAL_ZONEID) {
1340 				/*
1341 				 * If zoned property is 'off', this must be in
1342 				 * a global zone. If not, something is wrong.
1343 				 */
1344 				zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1345 				    "'%s' cannot be set while dataset "
1346 				    "'zoned' property is set"), propname);
1347 				(void) zfs_error(hdl, EZFS_ZONED, errbuf);
1348 				goto error;
1349 			}
1350 
1351 			/*
1352 			 * At this point, it is legitimate to set the
1353 			 * property. Now we want to make sure that the
1354 			 * property value is valid if it is sharenfs.
1355 			 */
1356 			if ((prop == ZFS_PROP_SHARENFS ||
1357 			    prop == ZFS_PROP_SHARESMB) &&
1358 			    strcmp(strval, "on") != 0 &&
1359 			    strcmp(strval, "off") != 0) {
1360 				zfs_share_proto_t proto;
1361 
1362 				if (prop == ZFS_PROP_SHARESMB)
1363 					proto = PROTO_SMB;
1364 				else
1365 					proto = PROTO_NFS;
1366 
1367 				/*
1368 				 * Must be an valid sharing protocol
1369 				 * option string so init the libshare
1370 				 * in order to enable the parser and
1371 				 * then parse the options. We use the
1372 				 * control API since we don't care about
1373 				 * the current configuration and don't
1374 				 * want the overhead of loading it
1375 				 * until we actually do something.
1376 				 */
1377 
1378 				if (zfs_init_libshare(hdl,
1379 				    SA_INIT_CONTROL_API) != SA_OK) {
1380 					/*
1381 					 * An error occurred so we can't do
1382 					 * anything
1383 					 */
1384 					zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1385 					    "'%s' cannot be set: problem "
1386 					    "in share initialization"),
1387 					    propname);
1388 					(void) zfs_error(hdl, EZFS_BADPROP,
1389 					    errbuf);
1390 					goto error;
1391 				}
1392 
1393 				if (zfs_parse_options(strval, proto) != SA_OK) {
1394 					/*
1395 					 * There was an error in parsing so
1396 					 * deal with it by issuing an error
1397 					 * message and leaving after
1398 					 * uninitializing the the libshare
1399 					 * interface.
1400 					 */
1401 					zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1402 					    "'%s' cannot be set to invalid "
1403 					    "options"), propname);
1404 					(void) zfs_error(hdl, EZFS_BADPROP,
1405 					    errbuf);
1406 					zfs_uninit_libshare(hdl);
1407 					goto error;
1408 				}
1409 				zfs_uninit_libshare(hdl);
1410 			}
1411 
1412 			break;
1413 
1414 		case ZFS_PROP_KEYLOCATION:
1415 			if (!zfs_prop_valid_keylocation(strval, B_FALSE)) {
1416 				zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1417 				    "invalid keylocation"));
1418 				(void) zfs_error(hdl, EZFS_BADPROP, errbuf);
1419 				goto error;
1420 			}
1421 
1422 			if (zhp != NULL) {
1423 				uint64_t crypt =
1424 				    zfs_prop_get_int(zhp, ZFS_PROP_ENCRYPTION);
1425 
1426 				if (crypt == ZIO_CRYPT_OFF &&
1427 				    strcmp(strval, "none") != 0) {
1428 					zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1429 					    "keylocation must be 'none' "
1430 					    "for unencrypted datasets"));
1431 					(void) zfs_error(hdl, EZFS_BADPROP,
1432 					    errbuf);
1433 					goto error;
1434 				} else if (crypt != ZIO_CRYPT_OFF &&
1435 				    strcmp(strval, "none") == 0) {
1436 					zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1437 					    "keylocation must not be 'none' "
1438 					    "for encrypted datasets"));
1439 					(void) zfs_error(hdl, EZFS_BADPROP,
1440 					    errbuf);
1441 					goto error;
1442 				}
1443 			}
1444 			break;
1445 
1446 		case ZFS_PROP_PBKDF2_ITERS:
1447 			if (intval < MIN_PBKDF2_ITERATIONS) {
1448 				zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1449 				    "minimum pbkdf2 iterations is %u"),
1450 				    MIN_PBKDF2_ITERATIONS);
1451 				(void) zfs_error(hdl, EZFS_BADPROP, errbuf);
1452 				goto error;
1453 			}
1454 			break;
1455 
1456 		case ZFS_PROP_UTF8ONLY:
1457 			chosen_utf = (int)intval;
1458 			break;
1459 
1460 		case ZFS_PROP_NORMALIZE:
1461 			chosen_normal = (int)intval;
1462 			break;
1463 
1464 		default:
1465 			break;
1466 		}
1467 
1468 		/*
1469 		 * For changes to existing volumes, we have some additional
1470 		 * checks to enforce.
1471 		 */
1472 		if (type == ZFS_TYPE_VOLUME && zhp != NULL) {
1473 			uint64_t volsize = zfs_prop_get_int(zhp,
1474 			    ZFS_PROP_VOLSIZE);
1475 			uint64_t blocksize = zfs_prop_get_int(zhp,
1476 			    ZFS_PROP_VOLBLOCKSIZE);
1477 			char buf[64];
1478 
1479 			switch (prop) {
1480 			case ZFS_PROP_RESERVATION:
1481 				if (intval > volsize) {
1482 					zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1483 					    "'%s' is greater than current "
1484 					    "volume size"), propname);
1485 					(void) zfs_error(hdl, EZFS_BADPROP,
1486 					    errbuf);
1487 					goto error;
1488 				}
1489 				break;
1490 
1491 			case ZFS_PROP_REFRESERVATION:
1492 				if (intval > volsize && intval != UINT64_MAX) {
1493 					zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1494 					    "'%s' is greater than current "
1495 					    "volume size"), propname);
1496 					(void) zfs_error(hdl, EZFS_BADPROP,
1497 					    errbuf);
1498 					goto error;
1499 				}
1500 				break;
1501 
1502 			case ZFS_PROP_VOLSIZE:
1503 				if (intval % blocksize != 0) {
1504 					zfs_nicenum(blocksize, buf,
1505 					    sizeof (buf));
1506 					zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1507 					    "'%s' must be a multiple of "
1508 					    "volume block size (%s)"),
1509 					    propname, buf);
1510 					(void) zfs_error(hdl, EZFS_BADPROP,
1511 					    errbuf);
1512 					goto error;
1513 				}
1514 
1515 				if (intval == 0) {
1516 					zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1517 					    "'%s' cannot be zero"),
1518 					    propname);
1519 					(void) zfs_error(hdl, EZFS_BADPROP,
1520 					    errbuf);
1521 					goto error;
1522 				}
1523 				break;
1524 
1525 			default:
1526 				break;
1527 			}
1528 		}
1529 
1530 		/* check encryption properties */
1531 		if (zhp != NULL) {
1532 			int64_t crypt = zfs_prop_get_int(zhp,
1533 			    ZFS_PROP_ENCRYPTION);
1534 
1535 			switch (prop) {
1536 			case ZFS_PROP_COPIES:
1537 				if (crypt != ZIO_CRYPT_OFF && intval > 2) {
1538 					zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1539 					    "encrypted datasets cannot have "
1540 					    "3 copies"));
1541 					(void) zfs_error(hdl, EZFS_BADPROP,
1542 					    errbuf);
1543 					goto error;
1544 				}
1545 				break;
1546 			default:
1547 				break;
1548 			}
1549 		}
1550 	}
1551 
1552 	/*
1553 	 * If normalization was chosen, but no UTF8 choice was made,
1554 	 * enforce rejection of non-UTF8 names.
1555 	 *
1556 	 * If normalization was chosen, but rejecting non-UTF8 names
1557 	 * was explicitly not chosen, it is an error.
1558 	 */
1559 	if (chosen_normal > 0 && chosen_utf < 0) {
1560 		if (nvlist_add_uint64(ret,
1561 		    zfs_prop_to_name(ZFS_PROP_UTF8ONLY), 1) != 0) {
1562 			(void) no_memory(hdl);
1563 			goto error;
1564 		}
1565 	} else if (chosen_normal > 0 && chosen_utf == 0) {
1566 		zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1567 		    "'%s' must be set 'on' if normalization chosen"),
1568 		    zfs_prop_to_name(ZFS_PROP_UTF8ONLY));
1569 		(void) zfs_error(hdl, EZFS_BADPROP, errbuf);
1570 		goto error;
1571 	}
1572 	return (ret);
1573 
1574 error:
1575 	nvlist_free(ret);
1576 	return (NULL);
1577 }
1578 
1579 int
1580 zfs_add_synthetic_resv(zfs_handle_t *zhp, nvlist_t *nvl)
1581 {
1582 	uint64_t old_volsize;
1583 	uint64_t new_volsize;
1584 	uint64_t old_reservation;
1585 	uint64_t new_reservation;
1586 	zfs_prop_t resv_prop;
1587 	nvlist_t *props;
1588 	zpool_handle_t *zph = zpool_handle(zhp);
1589 
1590 	/*
1591 	 * If this is an existing volume, and someone is setting the volsize,
1592 	 * make sure that it matches the reservation, or add it if necessary.
1593 	 */
1594 	old_volsize = zfs_prop_get_int(zhp, ZFS_PROP_VOLSIZE);
1595 	if (zfs_which_resv_prop(zhp, &resv_prop) < 0)
1596 		return (-1);
1597 	old_reservation = zfs_prop_get_int(zhp, resv_prop);
1598 
1599 	props = fnvlist_alloc();
1600 	fnvlist_add_uint64(props, zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE),
1601 	    zfs_prop_get_int(zhp, ZFS_PROP_VOLBLOCKSIZE));
1602 
1603 	if ((zvol_volsize_to_reservation(zph, old_volsize, props) !=
1604 	    old_reservation) || nvlist_exists(nvl,
1605 	    zfs_prop_to_name(resv_prop))) {
1606 		fnvlist_free(props);
1607 		return (0);
1608 	}
1609 	if (nvlist_lookup_uint64(nvl, zfs_prop_to_name(ZFS_PROP_VOLSIZE),
1610 	    &new_volsize) != 0) {
1611 		fnvlist_free(props);
1612 		return (-1);
1613 	}
1614 	new_reservation = zvol_volsize_to_reservation(zph, new_volsize, props);
1615 	fnvlist_free(props);
1616 
1617 	if (nvlist_add_uint64(nvl, zfs_prop_to_name(resv_prop),
1618 	    new_reservation) != 0) {
1619 		(void) no_memory(zhp->zfs_hdl);
1620 		return (-1);
1621 	}
1622 	return (1);
1623 }
1624 
1625 /*
1626  * Helper for 'zfs {set|clone} refreservation=auto'.  Must be called after
1627  * zfs_valid_proplist(), as it is what sets the UINT64_MAX sentinal value.
1628  * Return codes must match zfs_add_synthetic_resv().
1629  */
1630 static int
1631 zfs_fix_auto_resv(zfs_handle_t *zhp, nvlist_t *nvl)
1632 {
1633 	uint64_t volsize;
1634 	uint64_t resvsize;
1635 	zfs_prop_t prop;
1636 	nvlist_t *props;
1637 
1638 	if (!ZFS_IS_VOLUME(zhp)) {
1639 		return (0);
1640 	}
1641 
1642 	if (zfs_which_resv_prop(zhp, &prop) != 0) {
1643 		return (-1);
1644 	}
1645 
1646 	if (prop != ZFS_PROP_REFRESERVATION) {
1647 		return (0);
1648 	}
1649 
1650 	if (nvlist_lookup_uint64(nvl, zfs_prop_to_name(prop), &resvsize) != 0) {
1651 		/* No value being set, so it can't be "auto" */
1652 		return (0);
1653 	}
1654 	if (resvsize != UINT64_MAX) {
1655 		/* Being set to a value other than "auto" */
1656 		return (0);
1657 	}
1658 
1659 	props = fnvlist_alloc();
1660 
1661 	fnvlist_add_uint64(props, zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE),
1662 	    zfs_prop_get_int(zhp, ZFS_PROP_VOLBLOCKSIZE));
1663 
1664 	if (nvlist_lookup_uint64(nvl, zfs_prop_to_name(ZFS_PROP_VOLSIZE),
1665 	    &volsize) != 0) {
1666 		volsize = zfs_prop_get_int(zhp, ZFS_PROP_VOLSIZE);
1667 	}
1668 
1669 	resvsize = zvol_volsize_to_reservation(zpool_handle(zhp), volsize,
1670 	    props);
1671 	fnvlist_free(props);
1672 
1673 	(void) nvlist_remove_all(nvl, zfs_prop_to_name(prop));
1674 	if (nvlist_add_uint64(nvl, zfs_prop_to_name(prop), resvsize) != 0) {
1675 		(void) no_memory(zhp->zfs_hdl);
1676 		return (-1);
1677 	}
1678 	return (1);
1679 }
1680 
1681 void
1682 zfs_setprop_error(libzfs_handle_t *hdl, zfs_prop_t prop, int err,
1683     char *errbuf)
1684 {
1685 	switch (err) {
1686 
1687 	case ENOSPC:
1688 		/*
1689 		 * For quotas and reservations, ENOSPC indicates
1690 		 * something different; setting a quota or reservation
1691 		 * doesn't use any disk space.
1692 		 */
1693 		switch (prop) {
1694 		case ZFS_PROP_QUOTA:
1695 		case ZFS_PROP_REFQUOTA:
1696 			zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1697 			    "size is less than current used or "
1698 			    "reserved space"));
1699 			(void) zfs_error(hdl, EZFS_PROPSPACE, errbuf);
1700 			break;
1701 
1702 		case ZFS_PROP_RESERVATION:
1703 		case ZFS_PROP_REFRESERVATION:
1704 			zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1705 			    "size is greater than available space"));
1706 			(void) zfs_error(hdl, EZFS_PROPSPACE, errbuf);
1707 			break;
1708 
1709 		default:
1710 			(void) zfs_standard_error(hdl, err, errbuf);
1711 			break;
1712 		}
1713 		break;
1714 
1715 	case EBUSY:
1716 		(void) zfs_standard_error(hdl, EBUSY, errbuf);
1717 		break;
1718 
1719 	case EROFS:
1720 		(void) zfs_error(hdl, EZFS_DSREADONLY, errbuf);
1721 		break;
1722 
1723 	case E2BIG:
1724 		zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1725 		    "property value too long"));
1726 		(void) zfs_error(hdl, EZFS_BADPROP, errbuf);
1727 		break;
1728 
1729 	case ENOTSUP:
1730 		zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1731 		    "pool and or dataset must be upgraded to set this "
1732 		    "property or value"));
1733 		(void) zfs_error(hdl, EZFS_BADVERSION, errbuf);
1734 		break;
1735 
1736 	case ERANGE:
1737 		if (prop == ZFS_PROP_COMPRESSION ||
1738 		    prop == ZFS_PROP_RECORDSIZE) {
1739 			(void) zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1740 			    "property setting is not allowed on "
1741 			    "bootable datasets"));
1742 			(void) zfs_error(hdl, EZFS_NOTSUP, errbuf);
1743 		} else if (prop == ZFS_PROP_CHECKSUM ||
1744 		    prop == ZFS_PROP_DEDUP) {
1745 			(void) zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1746 			    "property setting is not allowed on "
1747 			    "root pools"));
1748 			(void) zfs_error(hdl, EZFS_NOTSUP, errbuf);
1749 		} else {
1750 			(void) zfs_standard_error(hdl, err, errbuf);
1751 		}
1752 		break;
1753 
1754 	case EINVAL:
1755 		if (prop == ZPROP_INVAL) {
1756 			(void) zfs_error(hdl, EZFS_BADPROP, errbuf);
1757 		} else {
1758 			(void) zfs_standard_error(hdl, err, errbuf);
1759 		}
1760 		break;
1761 
1762 	case EACCES:
1763 		if (prop == ZFS_PROP_KEYLOCATION) {
1764 			zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1765 			    "keylocation may only be set on encryption roots"));
1766 			(void) zfs_error(hdl, EZFS_BADPROP, errbuf);
1767 		} else {
1768 			(void) zfs_standard_error(hdl, err, errbuf);
1769 		}
1770 		break;
1771 
1772 	case EOVERFLOW:
1773 		/*
1774 		 * This platform can't address a volume this big.
1775 		 */
1776 #ifdef _ILP32
1777 		if (prop == ZFS_PROP_VOLSIZE) {
1778 			(void) zfs_error(hdl, EZFS_VOLTOOBIG, errbuf);
1779 			break;
1780 		}
1781 #endif
1782 		/* FALLTHROUGH */
1783 	default:
1784 		(void) zfs_standard_error(hdl, err, errbuf);
1785 	}
1786 }
1787 
1788 /*
1789  * Given a property name and value, set the property for the given dataset.
1790  */
1791 int
1792 zfs_prop_set(zfs_handle_t *zhp, const char *propname, const char *propval)
1793 {
1794 	int ret = -1;
1795 	char errbuf[1024];
1796 	libzfs_handle_t *hdl = zhp->zfs_hdl;
1797 	nvlist_t *nvl = NULL;
1798 
1799 	(void) snprintf(errbuf, sizeof (errbuf),
1800 	    dgettext(TEXT_DOMAIN, "cannot set property for '%s'"),
1801 	    zhp->zfs_name);
1802 
1803 	if (nvlist_alloc(&nvl, NV_UNIQUE_NAME, 0) != 0 ||
1804 	    nvlist_add_string(nvl, propname, propval) != 0) {
1805 		(void) no_memory(hdl);
1806 		goto error;
1807 	}
1808 
1809 	ret = zfs_prop_set_list(zhp, nvl);
1810 
1811 error:
1812 	nvlist_free(nvl);
1813 	return (ret);
1814 }
1815 
1816 
1817 
1818 /*
1819  * Given an nvlist of property names and values, set the properties for the
1820  * given dataset.
1821  */
1822 int
1823 zfs_prop_set_list(zfs_handle_t *zhp, nvlist_t *props)
1824 {
1825 	zfs_cmd_t zc = { 0 };
1826 	int ret = -1;
1827 	prop_changelist_t **cls = NULL;
1828 	int cl_idx;
1829 	char errbuf[1024];
1830 	libzfs_handle_t *hdl = zhp->zfs_hdl;
1831 	nvlist_t *nvl;
1832 	int nvl_len;
1833 	int added_resv = 0;
1834 
1835 	(void) snprintf(errbuf, sizeof (errbuf),
1836 	    dgettext(TEXT_DOMAIN, "cannot set property for '%s'"),
1837 	    zhp->zfs_name);
1838 
1839 	if ((nvl = zfs_valid_proplist(hdl, zhp->zfs_type, props,
1840 	    zfs_prop_get_int(zhp, ZFS_PROP_ZONED), zhp, zhp->zpool_hdl,
1841 	    B_FALSE, errbuf)) == NULL)
1842 		goto error;
1843 
1844 	/*
1845 	 * We have to check for any extra properties which need to be added
1846 	 * before computing the length of the nvlist.
1847 	 */
1848 	for (nvpair_t *elem = nvlist_next_nvpair(nvl, NULL);
1849 	    elem != NULL;
1850 	    elem = nvlist_next_nvpair(nvl, elem)) {
1851 		if (zfs_name_to_prop(nvpair_name(elem)) == ZFS_PROP_VOLSIZE &&
1852 		    (added_resv = zfs_add_synthetic_resv(zhp, nvl)) == -1) {
1853 			goto error;
1854 		}
1855 	}
1856 
1857 	if (added_resv != 1 &&
1858 	    (added_resv = zfs_fix_auto_resv(zhp, nvl)) == -1) {
1859 		goto error;
1860 	}
1861 
1862 	/*
1863 	 * Check how many properties we're setting and allocate an array to
1864 	 * store changelist pointers for postfix().
1865 	 */
1866 	nvl_len = 0;
1867 	for (nvpair_t *elem = nvlist_next_nvpair(nvl, NULL);
1868 	    elem != NULL;
1869 	    elem = nvlist_next_nvpair(nvl, elem))
1870 		nvl_len++;
1871 	if ((cls = calloc(nvl_len, sizeof (prop_changelist_t *))) == NULL)
1872 		goto error;
1873 
1874 	cl_idx = 0;
1875 	for (nvpair_t *elem = nvlist_next_nvpair(nvl, NULL);
1876 	    elem != NULL;
1877 	    elem = nvlist_next_nvpair(nvl, elem)) {
1878 
1879 		zfs_prop_t prop = zfs_name_to_prop(nvpair_name(elem));
1880 
1881 		assert(cl_idx < nvl_len);
1882 		/*
1883 		 * We don't want to unmount & remount the dataset when changing
1884 		 * its canmount property to 'on' or 'noauto'.  We only use
1885 		 * the changelist logic to unmount when setting canmount=off.
1886 		 */
1887 		if (prop != ZFS_PROP_CANMOUNT ||
1888 		    (fnvpair_value_uint64(elem) == ZFS_CANMOUNT_OFF &&
1889 		    zfs_is_mounted(zhp, NULL))) {
1890 			cls[cl_idx] = changelist_gather(zhp, prop, 0, 0);
1891 			if (cls[cl_idx] == NULL)
1892 				goto error;
1893 		}
1894 
1895 		if (prop == ZFS_PROP_MOUNTPOINT &&
1896 		    changelist_haszonedchild(cls[cl_idx])) {
1897 			zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1898 			    "child dataset with inherited mountpoint is used "
1899 			    "in a non-global zone"));
1900 			ret = zfs_error(hdl, EZFS_ZONED, errbuf);
1901 			goto error;
1902 		}
1903 
1904 		if (cls[cl_idx] != NULL &&
1905 		    (ret = changelist_prefix(cls[cl_idx])) != 0)
1906 			goto error;
1907 
1908 		cl_idx++;
1909 	}
1910 	assert(cl_idx == nvl_len);
1911 
1912 	/*
1913 	 * Execute the corresponding ioctl() to set this list of properties.
1914 	 */
1915 	(void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));
1916 
1917 	if ((ret = zcmd_write_src_nvlist(hdl, &zc, nvl)) != 0 ||
1918 	    (ret = zcmd_alloc_dst_nvlist(hdl, &zc, 0)) != 0)
1919 		goto error;
1920 
1921 	ret = zfs_ioctl(hdl, ZFS_IOC_SET_PROP, &zc);
1922 
1923 	if (ret != 0) {
1924 		if (zc.zc_nvlist_dst_filled == B_FALSE) {
1925 			(void) zfs_standard_error(hdl, errno, errbuf);
1926 			goto error;
1927 		}
1928 
1929 		/* Get the list of unset properties back and report them. */
1930 		nvlist_t *errorprops = NULL;
1931 		if (zcmd_read_dst_nvlist(hdl, &zc, &errorprops) != 0)
1932 			goto error;
1933 		for (nvpair_t *elem = nvlist_next_nvpair(errorprops, NULL);
1934 		    elem != NULL;
1935 		    elem = nvlist_next_nvpair(errorprops, elem)) {
1936 			zfs_prop_t prop = zfs_name_to_prop(nvpair_name(elem));
1937 			zfs_setprop_error(hdl, prop, errno, errbuf);
1938 		}
1939 		nvlist_free(errorprops);
1940 
1941 		if (added_resv && errno == ENOSPC) {
1942 			/* clean up the volsize property we tried to set */
1943 			uint64_t old_volsize = zfs_prop_get_int(zhp,
1944 			    ZFS_PROP_VOLSIZE);
1945 			nvlist_free(nvl);
1946 			nvl = NULL;
1947 			zcmd_free_nvlists(&zc);
1948 
1949 			if (nvlist_alloc(&nvl, NV_UNIQUE_NAME, 0) != 0)
1950 				goto error;
1951 			if (nvlist_add_uint64(nvl,
1952 			    zfs_prop_to_name(ZFS_PROP_VOLSIZE),
1953 			    old_volsize) != 0)
1954 				goto error;
1955 			if (zcmd_write_src_nvlist(hdl, &zc, nvl) != 0)
1956 				goto error;
1957 			(void) zfs_ioctl(hdl, ZFS_IOC_SET_PROP, &zc);
1958 		}
1959 	} else {
1960 		for (cl_idx = 0; cl_idx < nvl_len; cl_idx++) {
1961 			if (cls[cl_idx] != NULL) {
1962 				int clp_err = changelist_postfix(cls[cl_idx]);
1963 				if (clp_err != 0)
1964 					ret = clp_err;
1965 			}
1966 		}
1967 
1968 		/*
1969 		 * Refresh the statistics so the new property value
1970 		 * is reflected.
1971 		 */
1972 		if (ret == 0)
1973 			(void) get_stats(zhp);
1974 	}
1975 
1976 error:
1977 	nvlist_free(nvl);
1978 	zcmd_free_nvlists(&zc);
1979 	if (cls != NULL) {
1980 		for (cl_idx = 0; cl_idx < nvl_len; cl_idx++) {
1981 			if (cls[cl_idx] != NULL)
1982 				changelist_free(cls[cl_idx]);
1983 		}
1984 		free(cls);
1985 	}
1986 	return (ret);
1987 }
1988 
1989 /*
1990  * Given a property, inherit the value from the parent dataset, or if received
1991  * is TRUE, revert to the received value, if any.
1992  */
1993 int
1994 zfs_prop_inherit(zfs_handle_t *zhp, const char *propname, boolean_t received)
1995 {
1996 	zfs_cmd_t zc = { 0 };
1997 	int ret;
1998 	prop_changelist_t *cl;
1999 	libzfs_handle_t *hdl = zhp->zfs_hdl;
2000 	char errbuf[1024];
2001 	zfs_prop_t prop;
2002 
2003 	(void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
2004 	    "cannot inherit %s for '%s'"), propname, zhp->zfs_name);
2005 
2006 	zc.zc_cookie = received;
2007 	if ((prop = zfs_name_to_prop(propname)) == ZPROP_INVAL) {
2008 		/*
2009 		 * For user properties, the amount of work we have to do is very
2010 		 * small, so just do it here.
2011 		 */
2012 		if (!zfs_prop_user(propname)) {
2013 			zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
2014 			    "invalid property"));
2015 			return (zfs_error(hdl, EZFS_BADPROP, errbuf));
2016 		}
2017 
2018 		(void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));
2019 		(void) strlcpy(zc.zc_value, propname, sizeof (zc.zc_value));
2020 
2021 		if (zfs_ioctl(zhp->zfs_hdl, ZFS_IOC_INHERIT_PROP, &zc) != 0)
2022 			return (zfs_standard_error(hdl, errno, errbuf));
2023 
2024 		return (0);
2025 	}
2026 
2027 	/*
2028 	 * Verify that this property is inheritable.
2029 	 */
2030 	if (zfs_prop_readonly(prop))
2031 		return (zfs_error(hdl, EZFS_PROPREADONLY, errbuf));
2032 
2033 	if (!zfs_prop_inheritable(prop) && !received)
2034 		return (zfs_error(hdl, EZFS_PROPNONINHERIT, errbuf));
2035 
2036 	/*
2037 	 * Check to see if the value applies to this type
2038 	 */
2039 	if (!zfs_prop_valid_for_type(prop, zhp->zfs_type))
2040 		return (zfs_error(hdl, EZFS_PROPTYPE, errbuf));
2041 
2042 	/*
2043 	 * Normalize the name, to get rid of shorthand abbreviations.
2044 	 */
2045 	propname = zfs_prop_to_name(prop);
2046 	(void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));
2047 	(void) strlcpy(zc.zc_value, propname, sizeof (zc.zc_value));
2048 
2049 	if (prop == ZFS_PROP_MOUNTPOINT && getzoneid() == GLOBAL_ZONEID &&
2050 	    zfs_prop_get_int(zhp, ZFS_PROP_ZONED)) {
2051 		zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
2052 		    "dataset is used in a non-global zone"));
2053 		return (zfs_error(hdl, EZFS_ZONED, errbuf));
2054 	}
2055 
2056 	/*
2057 	 * Determine datasets which will be affected by this change, if any.
2058 	 */
2059 	if ((cl = changelist_gather(zhp, prop, 0, 0)) == NULL)
2060 		return (-1);
2061 
2062 	if (prop == ZFS_PROP_MOUNTPOINT && changelist_haszonedchild(cl)) {
2063 		zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
2064 		    "child dataset with inherited mountpoint is used "
2065 		    "in a non-global zone"));
2066 		ret = zfs_error(hdl, EZFS_ZONED, errbuf);
2067 		goto error;
2068 	}
2069 
2070 	if ((ret = changelist_prefix(cl)) != 0)
2071 		goto error;
2072 
2073 	if ((ret = zfs_ioctl(zhp->zfs_hdl, ZFS_IOC_INHERIT_PROP, &zc)) != 0) {
2074 		return (zfs_standard_error(hdl, errno, errbuf));
2075 	} else {
2076 
2077 		if ((ret = changelist_postfix(cl)) != 0)
2078 			goto error;
2079 
2080 		/*
2081 		 * Refresh the statistics so the new property is reflected.
2082 		 */
2083 		(void) get_stats(zhp);
2084 	}
2085 
2086 error:
2087 	changelist_free(cl);
2088 	return (ret);
2089 }
2090 
2091 /*
2092  * True DSL properties are stored in an nvlist.  The following two functions
2093  * extract them appropriately.
2094  */
2095 static uint64_t
2096 getprop_uint64(zfs_handle_t *zhp, zfs_prop_t prop, char **source)
2097 {
2098 	nvlist_t *nv;
2099 	uint64_t value;
2100 
2101 	*source = NULL;
2102 	if (nvlist_lookup_nvlist(zhp->zfs_props,
2103 	    zfs_prop_to_name(prop), &nv) == 0) {
2104 		verify(nvlist_lookup_uint64(nv, ZPROP_VALUE, &value) == 0);
2105 		(void) nvlist_lookup_string(nv, ZPROP_SOURCE, source);
2106 	} else {
2107 		verify(!zhp->zfs_props_table ||
2108 		    zhp->zfs_props_table[prop] == B_TRUE);
2109 		value = zfs_prop_default_numeric(prop);
2110 		*source = "";
2111 	}
2112 
2113 	return (value);
2114 }
2115 
2116 static const char *
2117 getprop_string(zfs_handle_t *zhp, zfs_prop_t prop, char **source)
2118 {
2119 	nvlist_t *nv;
2120 	const char *value;
2121 
2122 	*source = NULL;
2123 	if (nvlist_lookup_nvlist(zhp->zfs_props,
2124 	    zfs_prop_to_name(prop), &nv) == 0) {
2125 		value = fnvlist_lookup_string(nv, ZPROP_VALUE);
2126 		(void) nvlist_lookup_string(nv, ZPROP_SOURCE, source);
2127 	} else {
2128 		verify(!zhp->zfs_props_table ||
2129 		    zhp->zfs_props_table[prop] == B_TRUE);
2130 		value = zfs_prop_default_string(prop);
2131 		*source = "";
2132 	}
2133 
2134 	return (value);
2135 }
2136 
2137 static boolean_t
2138 zfs_is_recvd_props_mode(zfs_handle_t *zhp)
2139 {
2140 	return (zhp->zfs_props == zhp->zfs_recvd_props);
2141 }
2142 
2143 static void
2144 zfs_set_recvd_props_mode(zfs_handle_t *zhp, uint64_t *cookie)
2145 {
2146 	*cookie = (uint64_t)(uintptr_t)zhp->zfs_props;
2147 	zhp->zfs_props = zhp->zfs_recvd_props;
2148 }
2149 
2150 static void
2151 zfs_unset_recvd_props_mode(zfs_handle_t *zhp, uint64_t *cookie)
2152 {
2153 	zhp->zfs_props = (nvlist_t *)(uintptr_t)*cookie;
2154 	*cookie = 0;
2155 }
2156 
2157 /*
2158  * Internal function for getting a numeric property.  Both zfs_prop_get() and
2159  * zfs_prop_get_int() are built using this interface.
2160  *
2161  * Certain properties can be overridden using 'mount -o'.  In this case, scan
2162  * the contents of the /etc/mnttab entry, searching for the appropriate options.
2163  * If they differ from the on-disk values, report the current values and mark
2164  * the source "temporary".
2165  */
2166 static int
2167 get_numeric_property(zfs_handle_t *zhp, zfs_prop_t prop, zprop_source_t *src,
2168     char **source, uint64_t *val)
2169 {
2170 	zfs_cmd_t zc = { 0 };
2171 	nvlist_t *zplprops = NULL;
2172 	struct mnttab mnt;
2173 	char *mntopt_on = NULL;
2174 	char *mntopt_off = NULL;
2175 	boolean_t received = zfs_is_recvd_props_mode(zhp);
2176 
2177 	*source = NULL;
2178 
2179 	switch (prop) {
2180 	case ZFS_PROP_ATIME:
2181 		mntopt_on = MNTOPT_ATIME;
2182 		mntopt_off = MNTOPT_NOATIME;
2183 		break;
2184 
2185 	case ZFS_PROP_DEVICES:
2186 		mntopt_on = MNTOPT_DEVICES;
2187 		mntopt_off = MNTOPT_NODEVICES;
2188 		break;
2189 
2190 	case ZFS_PROP_EXEC:
2191 		mntopt_on = MNTOPT_EXEC;
2192 		mntopt_off = MNTOPT_NOEXEC;
2193 		break;
2194 
2195 	case ZFS_PROP_READONLY:
2196 		mntopt_on = MNTOPT_RO;
2197 		mntopt_off = MNTOPT_RW;
2198 		break;
2199 
2200 	case ZFS_PROP_SETUID:
2201 		mntopt_on = MNTOPT_SETUID;
2202 		mntopt_off = MNTOPT_NOSETUID;
2203 		break;
2204 
2205 	case ZFS_PROP_XATTR:
2206 		mntopt_on = MNTOPT_XATTR;
2207 		mntopt_off = MNTOPT_NOXATTR;
2208 		break;
2209 
2210 	case ZFS_PROP_NBMAND:
2211 		mntopt_on = MNTOPT_NBMAND;
2212 		mntopt_off = MNTOPT_NONBMAND;
2213 		break;
2214 
2215 	default:
2216 		break;
2217 	}
2218 
2219 	/*
2220 	 * Because looking up the mount options is potentially expensive
2221 	 * (iterating over all of /etc/mnttab), we defer its calculation until
2222 	 * we're looking up a property which requires its presence.
2223 	 */
2224 	if (!zhp->zfs_mntcheck &&
2225 	    (mntopt_on != NULL || prop == ZFS_PROP_MOUNTED)) {
2226 		libzfs_handle_t *hdl = zhp->zfs_hdl;
2227 		struct mnttab entry;
2228 
2229 		if (libzfs_mnttab_find(hdl, zhp->zfs_name, &entry) == 0) {
2230 			zhp->zfs_mntopts = zfs_strdup(hdl,
2231 			    entry.mnt_mntopts);
2232 			if (zhp->zfs_mntopts == NULL)
2233 				return (-1);
2234 		}
2235 
2236 		zhp->zfs_mntcheck = B_TRUE;
2237 	}
2238 
2239 	if (zhp->zfs_mntopts == NULL)
2240 		mnt.mnt_mntopts = "";
2241 	else
2242 		mnt.mnt_mntopts = zhp->zfs_mntopts;
2243 
2244 	switch (prop) {
2245 	case ZFS_PROP_ATIME:
2246 	case ZFS_PROP_DEVICES:
2247 	case ZFS_PROP_EXEC:
2248 	case ZFS_PROP_READONLY:
2249 	case ZFS_PROP_SETUID:
2250 	case ZFS_PROP_XATTR:
2251 	case ZFS_PROP_NBMAND:
2252 		*val = getprop_uint64(zhp, prop, source);
2253 
2254 		if (received)
2255 			break;
2256 
2257 		if (hasmntopt(&mnt, mntopt_on) && !*val) {
2258 			*val = B_TRUE;
2259 			if (src)
2260 				*src = ZPROP_SRC_TEMPORARY;
2261 		} else if (hasmntopt(&mnt, mntopt_off) && *val) {
2262 			*val = B_FALSE;
2263 			if (src)
2264 				*src = ZPROP_SRC_TEMPORARY;
2265 		}
2266 		break;
2267 
2268 	case ZFS_PROP_CANMOUNT:
2269 	case ZFS_PROP_VOLSIZE:
2270 	case ZFS_PROP_QUOTA:
2271 	case ZFS_PROP_REFQUOTA:
2272 	case ZFS_PROP_RESERVATION:
2273 	case ZFS_PROP_REFRESERVATION:
2274 	case ZFS_PROP_FILESYSTEM_LIMIT:
2275 	case ZFS_PROP_SNAPSHOT_LIMIT:
2276 	case ZFS_PROP_FILESYSTEM_COUNT:
2277 	case ZFS_PROP_SNAPSHOT_COUNT:
2278 		*val = getprop_uint64(zhp, prop, source);
2279 
2280 		if (*source == NULL) {
2281 			/* not default, must be local */
2282 			*source = zhp->zfs_name;
2283 		}
2284 		break;
2285 
2286 	case ZFS_PROP_MOUNTED:
2287 		*val = (zhp->zfs_mntopts != NULL);
2288 		break;
2289 
2290 	case ZFS_PROP_NUMCLONES:
2291 		*val = zhp->zfs_dmustats.dds_num_clones;
2292 		break;
2293 
2294 	case ZFS_PROP_VERSION:
2295 	case ZFS_PROP_NORMALIZE:
2296 	case ZFS_PROP_UTF8ONLY:
2297 	case ZFS_PROP_CASE:
2298 		if (!zfs_prop_valid_for_type(prop, zhp->zfs_head_type) ||
2299 		    zcmd_alloc_dst_nvlist(zhp->zfs_hdl, &zc, 0) != 0)
2300 			return (-1);
2301 		(void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));
2302 		if (zfs_ioctl(zhp->zfs_hdl, ZFS_IOC_OBJSET_ZPLPROPS, &zc)) {
2303 			zcmd_free_nvlists(&zc);
2304 			return (-1);
2305 		}
2306 		if (zcmd_read_dst_nvlist(zhp->zfs_hdl, &zc, &zplprops) != 0 ||
2307 		    nvlist_lookup_uint64(zplprops, zfs_prop_to_name(prop),
2308 		    val) != 0) {
2309 			zcmd_free_nvlists(&zc);
2310 			return (-1);
2311 		}
2312 		nvlist_free(zplprops);
2313 		zcmd_free_nvlists(&zc);
2314 		break;
2315 
2316 	case ZFS_PROP_INCONSISTENT:
2317 		*val = zhp->zfs_dmustats.dds_inconsistent;
2318 		break;
2319 
2320 	default:
2321 		switch (zfs_prop_get_type(prop)) {
2322 		case PROP_TYPE_NUMBER:
2323 		case PROP_TYPE_INDEX:
2324 			*val = getprop_uint64(zhp, prop, source);
2325 			/*
2326 			 * If we tried to use a default value for a
2327 			 * readonly property, it means that it was not
2328 			 * present.  Note this only applies to "truly"
2329 			 * readonly properties, not set-once properties
2330 			 * like volblocksize.
2331 			 */
2332 			if (zfs_prop_readonly(prop) &&
2333 			    !zfs_prop_setonce(prop) &&
2334 			    *source != NULL && (*source)[0] == '\0') {
2335 				*source = NULL;
2336 				return (-1);
2337 			}
2338 			break;
2339 
2340 		case PROP_TYPE_STRING:
2341 		default:
2342 			zfs_error_aux(zhp->zfs_hdl, dgettext(TEXT_DOMAIN,
2343 			    "cannot get non-numeric property"));
2344 			return (zfs_error(zhp->zfs_hdl, EZFS_BADPROP,
2345 			    dgettext(TEXT_DOMAIN, "internal error")));
2346 		}
2347 	}
2348 
2349 	return (0);
2350 }
2351 
2352 /*
2353  * Calculate the source type, given the raw source string.
2354  */
2355 static void
2356 get_source(zfs_handle_t *zhp, zprop_source_t *srctype, char *source,
2357     char *statbuf, size_t statlen)
2358 {
2359 	if (statbuf == NULL || *srctype == ZPROP_SRC_TEMPORARY)
2360 		return;
2361 
2362 	if (source == NULL) {
2363 		*srctype = ZPROP_SRC_NONE;
2364 	} else if (source[0] == '\0') {
2365 		*srctype = ZPROP_SRC_DEFAULT;
2366 	} else if (strstr(source, ZPROP_SOURCE_VAL_RECVD) != NULL) {
2367 		*srctype = ZPROP_SRC_RECEIVED;
2368 	} else {
2369 		if (strcmp(source, zhp->zfs_name) == 0) {
2370 			*srctype = ZPROP_SRC_LOCAL;
2371 		} else {
2372 			(void) strlcpy(statbuf, source, statlen);
2373 			*srctype = ZPROP_SRC_INHERITED;
2374 		}
2375 	}
2376 
2377 }
2378 
2379 int
2380 zfs_prop_get_recvd(zfs_handle_t *zhp, const char *propname, char *propbuf,
2381     size_t proplen, boolean_t literal)
2382 {
2383 	zfs_prop_t prop;
2384 	int err = 0;
2385 
2386 	if (zhp->zfs_recvd_props == NULL)
2387 		if (get_recvd_props_ioctl(zhp) != 0)
2388 			return (-1);
2389 
2390 	prop = zfs_name_to_prop(propname);
2391 
2392 	if (prop != ZPROP_INVAL) {
2393 		uint64_t cookie;
2394 		if (!nvlist_exists(zhp->zfs_recvd_props, propname))
2395 			return (-1);
2396 		zfs_set_recvd_props_mode(zhp, &cookie);
2397 		err = zfs_prop_get(zhp, prop, propbuf, proplen,
2398 		    NULL, NULL, 0, literal);
2399 		zfs_unset_recvd_props_mode(zhp, &cookie);
2400 	} else {
2401 		nvlist_t *propval;
2402 		char *recvdval;
2403 		if (nvlist_lookup_nvlist(zhp->zfs_recvd_props,
2404 		    propname, &propval) != 0)
2405 			return (-1);
2406 		verify(nvlist_lookup_string(propval, ZPROP_VALUE,
2407 		    &recvdval) == 0);
2408 		(void) strlcpy(propbuf, recvdval, proplen);
2409 	}
2410 
2411 	return (err == 0 ? 0 : -1);
2412 }
2413 
2414 static int
2415 get_clones_string(zfs_handle_t *zhp, char *propbuf, size_t proplen)
2416 {
2417 	nvlist_t *value;
2418 	nvpair_t *pair;
2419 
2420 	value = zfs_get_clones_nvl(zhp);
2421 	if (value == NULL)
2422 		return (-1);
2423 
2424 	propbuf[0] = '\0';
2425 	for (pair = nvlist_next_nvpair(value, NULL); pair != NULL;
2426 	    pair = nvlist_next_nvpair(value, pair)) {
2427 		if (propbuf[0] != '\0')
2428 			(void) strlcat(propbuf, ",", proplen);
2429 		(void) strlcat(propbuf, nvpair_name(pair), proplen);
2430 	}
2431 
2432 	return (0);
2433 }
2434 
2435 struct get_clones_arg {
2436 	uint64_t numclones;
2437 	nvlist_t *value;
2438 	const char *origin;
2439 	char buf[ZFS_MAX_DATASET_NAME_LEN];
2440 };
2441 
2442 int
2443 get_clones_cb(zfs_handle_t *zhp, void *arg)
2444 {
2445 	struct get_clones_arg *gca = arg;
2446 
2447 	if (gca->numclones == 0) {
2448 		zfs_close(zhp);
2449 		return (0);
2450 	}
2451 
2452 	if (zfs_prop_get(zhp, ZFS_PROP_ORIGIN, gca->buf, sizeof (gca->buf),
2453 	    NULL, NULL, 0, B_TRUE) != 0)
2454 		goto out;
2455 	if (strcmp(gca->buf, gca->origin) == 0) {
2456 		fnvlist_add_boolean(gca->value, zfs_get_name(zhp));
2457 		gca->numclones--;
2458 	}
2459 
2460 out:
2461 	(void) zfs_iter_children(zhp, get_clones_cb, gca);
2462 	zfs_close(zhp);
2463 	return (0);
2464 }
2465 
2466 nvlist_t *
2467 zfs_get_clones_nvl(zfs_handle_t *zhp)
2468 {
2469 	nvlist_t *nv, *value;
2470 
2471 	if (nvlist_lookup_nvlist(zhp->zfs_props,
2472 	    zfs_prop_to_name(ZFS_PROP_CLONES), &nv) != 0) {
2473 		struct get_clones_arg gca;
2474 
2475 		/*
2476 		 * if this is a snapshot, then the kernel wasn't able
2477 		 * to get the clones.  Do it by slowly iterating.
2478 		 */
2479 		if (zhp->zfs_type != ZFS_TYPE_SNAPSHOT)
2480 			return (NULL);
2481 		if (nvlist_alloc(&nv, NV_UNIQUE_NAME, 0) != 0)
2482 			return (NULL);
2483 		if (nvlist_alloc(&value, NV_UNIQUE_NAME, 0) != 0) {
2484 			nvlist_free(nv);
2485 			return (NULL);
2486 		}
2487 
2488 		gca.numclones = zfs_prop_get_int(zhp, ZFS_PROP_NUMCLONES);
2489 		gca.value = value;
2490 		gca.origin = zhp->zfs_name;
2491 
2492 		if (gca.numclones != 0) {
2493 			zfs_handle_t *root;
2494 			char pool[ZFS_MAX_DATASET_NAME_LEN];
2495 			char *cp = pool;
2496 
2497 			/* get the pool name */
2498 			(void) strlcpy(pool, zhp->zfs_name, sizeof (pool));
2499 			(void) strsep(&cp, "/@");
2500 			root = zfs_open(zhp->zfs_hdl, pool,
2501 			    ZFS_TYPE_FILESYSTEM);
2502 
2503 			(void) get_clones_cb(root, &gca);
2504 		}
2505 
2506 		if (gca.numclones != 0 ||
2507 		    nvlist_add_nvlist(nv, ZPROP_VALUE, value) != 0 ||
2508 		    nvlist_add_nvlist(zhp->zfs_props,
2509 		    zfs_prop_to_name(ZFS_PROP_CLONES), nv) != 0) {
2510 			nvlist_free(nv);
2511 			nvlist_free(value);
2512 			return (NULL);
2513 		}
2514 		nvlist_free(nv);
2515 		nvlist_free(value);
2516 		verify(0 == nvlist_lookup_nvlist(zhp->zfs_props,
2517 		    zfs_prop_to_name(ZFS_PROP_CLONES), &nv));
2518 	}
2519 
2520 	verify(nvlist_lookup_nvlist(nv, ZPROP_VALUE, &value) == 0);
2521 
2522 	return (value);
2523 }
2524 
2525 /*
2526  * Accepts a property and value and checks that the value
2527  * matches the one found by the channel program. If they are
2528  * not equal, print both of them.
2529  */
2530 void
2531 zcp_check(zfs_handle_t *zhp, zfs_prop_t prop, uint64_t intval,
2532     const char *strval)
2533 {
2534 	if (!zhp->zfs_hdl->libzfs_prop_debug)
2535 		return;
2536 	int error;
2537 	char *poolname = zhp->zpool_hdl->zpool_name;
2538 	const char *program =
2539 	    "args = ...\n"
2540 	    "ds = args['dataset']\n"
2541 	    "prop = args['property']\n"
2542 	    "value, setpoint = zfs.get_prop(ds, prop)\n"
2543 	    "return {value=value, setpoint=setpoint}\n";
2544 	nvlist_t *outnvl;
2545 	nvlist_t *retnvl;
2546 	nvlist_t *argnvl = fnvlist_alloc();
2547 
2548 	fnvlist_add_string(argnvl, "dataset", zhp->zfs_name);
2549 	fnvlist_add_string(argnvl, "property", zfs_prop_to_name(prop));
2550 
2551 	error = lzc_channel_program_nosync(poolname, program,
2552 	    10 * 1000 * 1000, 10 * 1024 * 1024, argnvl, &outnvl);
2553 
2554 	if (error == 0) {
2555 		retnvl = fnvlist_lookup_nvlist(outnvl, "return");
2556 		if (zfs_prop_get_type(prop) == PROP_TYPE_NUMBER) {
2557 			int64_t ans;
2558 			error = nvlist_lookup_int64(retnvl, "value", &ans);
2559 			if (error != 0) {
2560 				(void) fprintf(stderr, "zcp check error: %u\n",
2561 				    error);
2562 				return;
2563 			}
2564 			if (ans != intval) {
2565 				(void) fprintf(stderr,
2566 				    "%s: zfs found %lld, but zcp found %lld\n",
2567 				    zfs_prop_to_name(prop),
2568 				    (longlong_t)intval, (longlong_t)ans);
2569 			}
2570 		} else {
2571 			char *str_ans;
2572 			error = nvlist_lookup_string(retnvl, "value", &str_ans);
2573 			if (error != 0) {
2574 				(void) fprintf(stderr, "zcp check error: %u\n",
2575 				    error);
2576 				return;
2577 			}
2578 			if (strcmp(strval, str_ans) != 0) {
2579 				(void) fprintf(stderr,
2580 				    "%s: zfs found %s, but zcp found %s\n",
2581 				    zfs_prop_to_name(prop),
2582 				    strval, str_ans);
2583 			}
2584 		}
2585 	} else {
2586 		(void) fprintf(stderr,
2587 		    "zcp check failed, channel program error: %u\n", error);
2588 	}
2589 	nvlist_free(argnvl);
2590 	nvlist_free(outnvl);
2591 }
2592 
2593 /*
2594  * Retrieve a property from the given object.  If 'literal' is specified, then
2595  * numbers are left as exact values.  Otherwise, numbers are converted to a
2596  * human-readable form.
2597  *
2598  * Returns 0 on success, or -1 on error.
2599  */
2600 int
2601 zfs_prop_get(zfs_handle_t *zhp, zfs_prop_t prop, char *propbuf, size_t proplen,
2602     zprop_source_t *src, char *statbuf, size_t statlen, boolean_t literal)
2603 {
2604 	char *source = NULL;
2605 	uint64_t val;
2606 	const char *str;
2607 	const char *strval;
2608 	boolean_t received = zfs_is_recvd_props_mode(zhp);
2609 
2610 	/*
2611 	 * Check to see if this property applies to our object
2612 	 */
2613 	if (!zfs_prop_valid_for_type(prop, zhp->zfs_type))
2614 		return (-1);
2615 
2616 	if (received && zfs_prop_readonly(prop))
2617 		return (-1);
2618 
2619 	if (src)
2620 		*src = ZPROP_SRC_NONE;
2621 
2622 	switch (prop) {
2623 	case ZFS_PROP_CREATION:
2624 		/*
2625 		 * 'creation' is a time_t stored in the statistics.  We convert
2626 		 * this into a string unless 'literal' is specified.
2627 		 */
2628 		{
2629 			val = getprop_uint64(zhp, prop, &source);
2630 			time_t time = (time_t)val;
2631 			struct tm t;
2632 
2633 			if (literal ||
2634 			    localtime_r(&time, &t) == NULL ||
2635 			    strftime(propbuf, proplen, "%a %b %e %k:%M %Y",
2636 			    &t) == 0)
2637 				(void) snprintf(propbuf, proplen, "%llu", val);
2638 		}
2639 		zcp_check(zhp, prop, val, NULL);
2640 		break;
2641 
2642 	case ZFS_PROP_MOUNTPOINT:
2643 		/*
2644 		 * Getting the precise mountpoint can be tricky.
2645 		 *
2646 		 *  - for 'none' or 'legacy', return those values.
2647 		 *  - for inherited mountpoints, we want to take everything
2648 		 *    after our ancestor and append it to the inherited value.
2649 		 *
2650 		 * If the pool has an alternate root, we want to prepend that
2651 		 * root to any values we return.
2652 		 */
2653 
2654 		str = getprop_string(zhp, prop, &source);
2655 
2656 		if (str[0] == '/') {
2657 			char buf[MAXPATHLEN];
2658 			char *root = buf;
2659 			const char *relpath;
2660 
2661 			/*
2662 			 * If we inherit the mountpoint, even from a dataset
2663 			 * with a received value, the source will be the path of
2664 			 * the dataset we inherit from. If source is
2665 			 * ZPROP_SOURCE_VAL_RECVD, the received value is not
2666 			 * inherited.
2667 			 */
2668 			if (strcmp(source, ZPROP_SOURCE_VAL_RECVD) == 0) {
2669 				relpath = "";
2670 			} else {
2671 				relpath = zhp->zfs_name + strlen(source);
2672 				if (relpath[0] == '/')
2673 					relpath++;
2674 			}
2675 
2676 			if ((zpool_get_prop(zhp->zpool_hdl,
2677 			    ZPOOL_PROP_ALTROOT, buf, MAXPATHLEN, NULL,
2678 			    B_FALSE)) || (strcmp(root, "-") == 0))
2679 				root[0] = '\0';
2680 			/*
2681 			 * Special case an alternate root of '/'. This will
2682 			 * avoid having multiple leading slashes in the
2683 			 * mountpoint path.
2684 			 */
2685 			if (strcmp(root, "/") == 0)
2686 				root++;
2687 
2688 			/*
2689 			 * If the mountpoint is '/' then skip over this
2690 			 * if we are obtaining either an alternate root or
2691 			 * an inherited mountpoint.
2692 			 */
2693 			if (str[1] == '\0' && (root[0] != '\0' ||
2694 			    relpath[0] != '\0'))
2695 				str++;
2696 
2697 			if (relpath[0] == '\0')
2698 				(void) snprintf(propbuf, proplen, "%s%s",
2699 				    root, str);
2700 			else
2701 				(void) snprintf(propbuf, proplen, "%s%s%s%s",
2702 				    root, str, relpath[0] == '@' ? "" : "/",
2703 				    relpath);
2704 		} else {
2705 			/* 'legacy' or 'none' */
2706 			(void) strlcpy(propbuf, str, proplen);
2707 		}
2708 		zcp_check(zhp, prop, 0, propbuf);
2709 		break;
2710 
2711 	case ZFS_PROP_ORIGIN:
2712 		str = getprop_string(zhp, prop, &source);
2713 		if (str == NULL)
2714 			return (-1);
2715 		(void) strlcpy(propbuf, str, proplen);
2716 		zcp_check(zhp, prop, 0, str);
2717 		break;
2718 
2719 	case ZFS_PROP_CLONES:
2720 		if (get_clones_string(zhp, propbuf, proplen) != 0)
2721 			return (-1);
2722 		break;
2723 
2724 	case ZFS_PROP_QUOTA:
2725 	case ZFS_PROP_REFQUOTA:
2726 	case ZFS_PROP_RESERVATION:
2727 	case ZFS_PROP_REFRESERVATION:
2728 
2729 		if (get_numeric_property(zhp, prop, src, &source, &val) != 0)
2730 			return (-1);
2731 		/*
2732 		 * If quota or reservation is 0, we translate this into 'none'
2733 		 * (unless literal is set), and indicate that it's the default
2734 		 * value.  Otherwise, we print the number nicely and indicate
2735 		 * that its set locally.
2736 		 */
2737 		if (val == 0) {
2738 			if (literal)
2739 				(void) strlcpy(propbuf, "0", proplen);
2740 			else
2741 				(void) strlcpy(propbuf, "none", proplen);
2742 		} else {
2743 			if (literal)
2744 				(void) snprintf(propbuf, proplen, "%llu",
2745 				    (u_longlong_t)val);
2746 			else
2747 				zfs_nicenum(val, propbuf, proplen);
2748 		}
2749 		zcp_check(zhp, prop, val, NULL);
2750 		break;
2751 
2752 	case ZFS_PROP_FILESYSTEM_LIMIT:
2753 	case ZFS_PROP_SNAPSHOT_LIMIT:
2754 	case ZFS_PROP_FILESYSTEM_COUNT:
2755 	case ZFS_PROP_SNAPSHOT_COUNT:
2756 
2757 		if (get_numeric_property(zhp, prop, src, &source, &val) != 0)
2758 			return (-1);
2759 
2760 		/*
2761 		 * If limit is UINT64_MAX, we translate this into 'none' (unless
2762 		 * literal is set), and indicate that it's the default value.
2763 		 * Otherwise, we print the number nicely and indicate that it's
2764 		 * set locally.
2765 		 */
2766 		if (literal) {
2767 			(void) snprintf(propbuf, proplen, "%llu",
2768 			    (u_longlong_t)val);
2769 		} else if (val == UINT64_MAX) {
2770 			(void) strlcpy(propbuf, "none", proplen);
2771 		} else {
2772 			zfs_nicenum(val, propbuf, proplen);
2773 		}
2774 
2775 		zcp_check(zhp, prop, val, NULL);
2776 		break;
2777 
2778 	case ZFS_PROP_REFRATIO:
2779 	case ZFS_PROP_COMPRESSRATIO:
2780 		if (get_numeric_property(zhp, prop, src, &source, &val) != 0)
2781 			return (-1);
2782 		(void) snprintf(propbuf, proplen, "%llu.%02llux",
2783 		    (u_longlong_t)(val / 100),
2784 		    (u_longlong_t)(val % 100));
2785 		zcp_check(zhp, prop, val, NULL);
2786 		break;
2787 
2788 	case ZFS_PROP_TYPE:
2789 		switch (zhp->zfs_type) {
2790 		case ZFS_TYPE_FILESYSTEM:
2791 			str = "filesystem";
2792 			break;
2793 		case ZFS_TYPE_VOLUME:
2794 			str = "volume";
2795 			break;
2796 		case ZFS_TYPE_SNAPSHOT:
2797 			str = "snapshot";
2798 			break;
2799 		case ZFS_TYPE_BOOKMARK:
2800 			str = "bookmark";
2801 			break;
2802 		default:
2803 			abort();
2804 		}
2805 		(void) snprintf(propbuf, proplen, "%s", str);
2806 		zcp_check(zhp, prop, 0, propbuf);
2807 		break;
2808 
2809 	case ZFS_PROP_MOUNTED:
2810 		/*
2811 		 * The 'mounted' property is a pseudo-property that described
2812 		 * whether the filesystem is currently mounted.  Even though
2813 		 * it's a boolean value, the typical values of "on" and "off"
2814 		 * don't make sense, so we translate to "yes" and "no".
2815 		 */
2816 		if (get_numeric_property(zhp, ZFS_PROP_MOUNTED,
2817 		    src, &source, &val) != 0)
2818 			return (-1);
2819 		if (val)
2820 			(void) strlcpy(propbuf, "yes", proplen);
2821 		else
2822 			(void) strlcpy(propbuf, "no", proplen);
2823 		break;
2824 
2825 	case ZFS_PROP_NAME:
2826 		/*
2827 		 * The 'name' property is a pseudo-property derived from the
2828 		 * dataset name.  It is presented as a real property to simplify
2829 		 * consumers.
2830 		 */
2831 		(void) strlcpy(propbuf, zhp->zfs_name, proplen);
2832 		zcp_check(zhp, prop, 0, propbuf);
2833 		break;
2834 
2835 	case ZFS_PROP_MLSLABEL:
2836 		{
2837 			m_label_t *new_sl = NULL;
2838 			char *ascii = NULL;	/* human readable label */
2839 
2840 			(void) strlcpy(propbuf,
2841 			    getprop_string(zhp, prop, &source), proplen);
2842 
2843 			if (literal || (strcasecmp(propbuf,
2844 			    ZFS_MLSLABEL_DEFAULT) == 0))
2845 				break;
2846 
2847 			/*
2848 			 * Try to translate the internal hex string to
2849 			 * human-readable output.  If there are any
2850 			 * problems just use the hex string.
2851 			 */
2852 
2853 			if (str_to_label(propbuf, &new_sl, MAC_LABEL,
2854 			    L_NO_CORRECTION, NULL) == -1) {
2855 				m_label_free(new_sl);
2856 				break;
2857 			}
2858 
2859 			if (label_to_str(new_sl, &ascii, M_LABEL,
2860 			    DEF_NAMES) != 0) {
2861 				if (ascii)
2862 					free(ascii);
2863 				m_label_free(new_sl);
2864 				break;
2865 			}
2866 			m_label_free(new_sl);
2867 
2868 			(void) strlcpy(propbuf, ascii, proplen);
2869 			free(ascii);
2870 		}
2871 		break;
2872 
2873 	case ZFS_PROP_GUID:
2874 	case ZFS_PROP_CREATETXG:
2875 		/*
2876 		 * GUIDs are stored as numbers, but they are identifiers.
2877 		 * We don't want them to be pretty printed, because pretty
2878 		 * printing mangles the ID into a truncated and useless value.
2879 		 */
2880 		if (get_numeric_property(zhp, prop, src, &source, &val) != 0)
2881 			return (-1);
2882 		(void) snprintf(propbuf, proplen, "%llu", (u_longlong_t)val);
2883 		zcp_check(zhp, prop, val, NULL);
2884 		break;
2885 
2886 	default:
2887 		switch (zfs_prop_get_type(prop)) {
2888 		case PROP_TYPE_NUMBER:
2889 			if (get_numeric_property(zhp, prop, src,
2890 			    &source, &val) != 0) {
2891 				return (-1);
2892 			}
2893 
2894 			if (literal) {
2895 				(void) snprintf(propbuf, proplen, "%llu",
2896 				    (u_longlong_t)val);
2897 			} else {
2898 				zfs_nicenum(val, propbuf, proplen);
2899 			}
2900 			zcp_check(zhp, prop, val, NULL);
2901 			break;
2902 
2903 		case PROP_TYPE_STRING:
2904 			str = getprop_string(zhp, prop, &source);
2905 			if (str == NULL)
2906 				return (-1);
2907 
2908 			(void) strlcpy(propbuf, str, proplen);
2909 			zcp_check(zhp, prop, 0, str);
2910 			break;
2911 
2912 		case PROP_TYPE_INDEX:
2913 			if (get_numeric_property(zhp, prop, src,
2914 			    &source, &val) != 0)
2915 				return (-1);
2916 			if (zfs_prop_index_to_string(prop, val, &strval) != 0)
2917 				return (-1);
2918 
2919 			(void) strlcpy(propbuf, strval, proplen);
2920 			zcp_check(zhp, prop, 0, strval);
2921 			break;
2922 
2923 		default:
2924 			abort();
2925 		}
2926 	}
2927 
2928 	get_source(zhp, src, source, statbuf, statlen);
2929 
2930 	return (0);
2931 }
2932 
2933 /*
2934  * Utility function to get the given numeric property.  Does no validation that
2935  * the given property is the appropriate type; should only be used with
2936  * hard-coded property types.
2937  */
2938 uint64_t
2939 zfs_prop_get_int(zfs_handle_t *zhp, zfs_prop_t prop)
2940 {
2941 	char *source;
2942 	uint64_t val;
2943 
2944 	(void) get_numeric_property(zhp, prop, NULL, &source, &val);
2945 
2946 	return (val);
2947 }
2948 
2949 int
2950 zfs_prop_set_int(zfs_handle_t *zhp, zfs_prop_t prop, uint64_t val)
2951 {
2952 	char buf[64];
2953 
2954 	(void) snprintf(buf, sizeof (buf), "%llu", (longlong_t)val);
2955 	return (zfs_prop_set(zhp, zfs_prop_to_name(prop), buf));
2956 }
2957 
2958 /*
2959  * Similar to zfs_prop_get(), but returns the value as an integer.
2960  */
2961 int
2962 zfs_prop_get_numeric(zfs_handle_t *zhp, zfs_prop_t prop, uint64_t *value,
2963     zprop_source_t *src, char *statbuf, size_t statlen)
2964 {
2965 	char *source;
2966 
2967 	/*
2968 	 * Check to see if this property applies to our object
2969 	 */
2970 	if (!zfs_prop_valid_for_type(prop, zhp->zfs_type)) {
2971 		return (zfs_error_fmt(zhp->zfs_hdl, EZFS_PROPTYPE,
2972 		    dgettext(TEXT_DOMAIN, "cannot get property '%s'"),
2973 		    zfs_prop_to_name(prop)));
2974 	}
2975 
2976 	if (src)
2977 		*src = ZPROP_SRC_NONE;
2978 
2979 	if (get_numeric_property(zhp, prop, src, &source, value) != 0)
2980 		return (-1);
2981 
2982 	get_source(zhp, src, source, statbuf, statlen);
2983 
2984 	return (0);
2985 }
2986 
2987 static int
2988 idmap_id_to_numeric_domain_rid(uid_t id, boolean_t isuser,
2989     char **domainp, idmap_rid_t *ridp)
2990 {
2991 	idmap_get_handle_t *get_hdl = NULL;
2992 	idmap_stat status;
2993 	int err = EINVAL;
2994 
2995 	if (idmap_get_create(&get_hdl) != IDMAP_SUCCESS)
2996 		goto out;
2997 
2998 	if (isuser) {
2999 		err = idmap_get_sidbyuid(get_hdl, id,
3000 		    IDMAP_REQ_FLG_USE_CACHE, domainp, ridp, &status);
3001 	} else {
3002 		err = idmap_get_sidbygid(get_hdl, id,
3003 		    IDMAP_REQ_FLG_USE_CACHE, domainp, ridp, &status);
3004 	}
3005 	if (err == IDMAP_SUCCESS &&
3006 	    idmap_get_mappings(get_hdl) == IDMAP_SUCCESS &&
3007 	    status == IDMAP_SUCCESS)
3008 		err = 0;
3009 	else
3010 		err = EINVAL;
3011 out:
3012 	if (get_hdl)
3013 		idmap_get_destroy(get_hdl);
3014 	return (err);
3015 }
3016 
3017 /*
3018  * convert the propname into parameters needed by kernel
3019  * Eg: userquota@ahrens -> ZFS_PROP_USERQUOTA, "", 126829
3020  * Eg: userused@matt@domain -> ZFS_PROP_USERUSED, "S-1-123-456", 789
3021  * Eg: groupquota@staff -> ZFS_PROP_GROUPQUOTA, "", 1234
3022  * Eg: groupused@staff -> ZFS_PROP_GROUPUSED, "", 1234
3023  * Eg: projectquota@123 -> ZFS_PROP_PROJECTQUOTA, "", 123
3024  * Eg: projectused@789 -> ZFS_PROP_PROJECTUSED, "", 789
3025  */
3026 static int
3027 userquota_propname_decode(const char *propname, boolean_t zoned,
3028     zfs_userquota_prop_t *typep, char *domain, int domainlen, uint64_t *ridp)
3029 {
3030 	zfs_userquota_prop_t type;
3031 	char *cp;
3032 	boolean_t isuser;
3033 	boolean_t isgroup;
3034 	boolean_t isproject;
3035 	struct passwd *pw;
3036 	struct group *gr;
3037 
3038 	domain[0] = '\0';
3039 
3040 	/* Figure out the property type ({user|group|project}{quota|space}) */
3041 	for (type = 0; type < ZFS_NUM_USERQUOTA_PROPS; type++) {
3042 		if (strncmp(propname, zfs_userquota_prop_prefixes[type],
3043 		    strlen(zfs_userquota_prop_prefixes[type])) == 0)
3044 			break;
3045 	}
3046 	if (type == ZFS_NUM_USERQUOTA_PROPS)
3047 		return (EINVAL);
3048 	*typep = type;
3049 
3050 	isuser = (type == ZFS_PROP_USERQUOTA || type == ZFS_PROP_USERUSED ||
3051 	    type == ZFS_PROP_USEROBJQUOTA ||
3052 	    type == ZFS_PROP_USEROBJUSED);
3053 	isgroup = (type == ZFS_PROP_GROUPQUOTA || type == ZFS_PROP_GROUPUSED ||
3054 	    type == ZFS_PROP_GROUPOBJQUOTA ||
3055 	    type == ZFS_PROP_GROUPOBJUSED);
3056 	isproject = (type == ZFS_PROP_PROJECTQUOTA ||
3057 	    type == ZFS_PROP_PROJECTUSED || type == ZFS_PROP_PROJECTOBJQUOTA ||
3058 	    type == ZFS_PROP_PROJECTOBJUSED);
3059 
3060 	cp = strchr(propname, '@') + 1;
3061 
3062 	if (isuser && (pw = getpwnam(cp)) != NULL) {
3063 		if (zoned && getzoneid() == GLOBAL_ZONEID)
3064 			return (ENOENT);
3065 		*ridp = pw->pw_uid;
3066 	} else if (isgroup && (gr = getgrnam(cp)) != NULL) {
3067 		if (zoned && getzoneid() == GLOBAL_ZONEID)
3068 			return (ENOENT);
3069 		*ridp = gr->gr_gid;
3070 	} else if (!isproject && strchr(cp, '@')) {
3071 		/*
3072 		 * It's a SID name (eg "user@domain") that needs to be
3073 		 * turned into S-1-domainID-RID.
3074 		 */
3075 		directory_error_t e;
3076 		char *numericsid = NULL;
3077 		char *end;
3078 
3079 		if (zoned && getzoneid() == GLOBAL_ZONEID)
3080 			return (ENOENT);
3081 		if (isuser) {
3082 			e = directory_sid_from_user_name(NULL,
3083 			    cp, &numericsid);
3084 		} else {
3085 			e = directory_sid_from_group_name(NULL,
3086 			    cp, &numericsid);
3087 		}
3088 		if (e != NULL) {
3089 			directory_error_free(e);
3090 			return (ENOENT);
3091 		}
3092 		if (numericsid == NULL)
3093 			return (ENOENT);
3094 		cp = numericsid;
3095 		(void) strlcpy(domain, cp, domainlen);
3096 		cp = strrchr(domain, '-');
3097 		*cp = '\0';
3098 		cp++;
3099 
3100 		errno = 0;
3101 		*ridp = strtoull(cp, &end, 10);
3102 		free(numericsid);
3103 
3104 		if (errno != 0 || *end != '\0')
3105 			return (EINVAL);
3106 	} else {
3107 		/* It's a user/group/project ID (eg "12345"). */
3108 		char *end;
3109 		uid_t id = strtoul(cp, &end, 10);
3110 		if (*end != '\0')
3111 			return (EINVAL);
3112 		if (id > MAXUID && !isproject) {
3113 			/* It's an ephemeral ID. */
3114 			idmap_rid_t rid;
3115 			char *mapdomain;
3116 
3117 			if (idmap_id_to_numeric_domain_rid(id, isuser,
3118 			    &mapdomain, &rid) != 0)
3119 				return (ENOENT);
3120 			(void) strlcpy(domain, mapdomain, domainlen);
3121 			*ridp = rid;
3122 		} else {
3123 			*ridp = id;
3124 		}
3125 	}
3126 
3127 	return (0);
3128 }
3129 
3130 static int
3131 zfs_prop_get_userquota_common(zfs_handle_t *zhp, const char *propname,
3132     uint64_t *propvalue, zfs_userquota_prop_t *typep)
3133 {
3134 	int err;
3135 	zfs_cmd_t zc = { 0 };
3136 
3137 	(void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));
3138 
3139 	err = userquota_propname_decode(propname,
3140 	    zfs_prop_get_int(zhp, ZFS_PROP_ZONED),
3141 	    typep, zc.zc_value, sizeof (zc.zc_value), &zc.zc_guid);
3142 	zc.zc_objset_type = *typep;
3143 	if (err)
3144 		return (err);
3145 
3146 	err = ioctl(zhp->zfs_hdl->libzfs_fd, ZFS_IOC_USERSPACE_ONE, &zc);
3147 	if (err)
3148 		return (err);
3149 
3150 	*propvalue = zc.zc_cookie;
3151 	return (0);
3152 }
3153 
3154 int
3155 zfs_prop_get_userquota_int(zfs_handle_t *zhp, const char *propname,
3156     uint64_t *propvalue)
3157 {
3158 	zfs_userquota_prop_t type;
3159 
3160 	return (zfs_prop_get_userquota_common(zhp, propname, propvalue,
3161 	    &type));
3162 }
3163 
3164 int
3165 zfs_prop_get_userquota(zfs_handle_t *zhp, const char *propname,
3166     char *propbuf, int proplen, boolean_t literal)
3167 {
3168 	int err;
3169 	uint64_t propvalue;
3170 	zfs_userquota_prop_t type;
3171 
3172 	err = zfs_prop_get_userquota_common(zhp, propname, &propvalue,
3173 	    &type);
3174 
3175 	if (err)
3176 		return (err);
3177 
3178 	if (literal) {
3179 		(void) snprintf(propbuf, proplen, "%llu", propvalue);
3180 	} else if (propvalue == 0 &&
3181 	    (type == ZFS_PROP_USERQUOTA || type == ZFS_PROP_GROUPQUOTA ||
3182 	    type == ZFS_PROP_USEROBJQUOTA || type == ZFS_PROP_GROUPOBJQUOTA ||
3183 	    type == ZFS_PROP_PROJECTQUOTA || ZFS_PROP_PROJECTOBJQUOTA)) {
3184 		(void) strlcpy(propbuf, "none", proplen);
3185 	} else if (type == ZFS_PROP_USERQUOTA || type == ZFS_PROP_GROUPQUOTA ||
3186 	    type == ZFS_PROP_USERUSED || type == ZFS_PROP_GROUPUSED ||
3187 	    type == ZFS_PROP_PROJECTUSED || type == ZFS_PROP_PROJECTQUOTA) {
3188 		zfs_nicenum(propvalue, propbuf, proplen);
3189 	} else {
3190 		zfs_nicenum(propvalue, propbuf, proplen);
3191 	}
3192 	return (0);
3193 }
3194 
3195 int
3196 zfs_prop_get_written_int(zfs_handle_t *zhp, const char *propname,
3197     uint64_t *propvalue)
3198 {
3199 	int err;
3200 	zfs_cmd_t zc = { 0 };
3201 	const char *snapname;
3202 
3203 	(void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));
3204 
3205 	snapname = strchr(propname, '@') + 1;
3206 	if (strchr(snapname, '@')) {
3207 		(void) strlcpy(zc.zc_value, snapname, sizeof (zc.zc_value));
3208 	} else {
3209 		/* snapname is the short name, append it to zhp's fsname */
3210 		char *cp;
3211 
3212 		(void) strlcpy(zc.zc_value, zhp->zfs_name,
3213 		    sizeof (zc.zc_value));
3214 		cp = strchr(zc.zc_value, '@');
3215 		if (cp != NULL)
3216 			*cp = '\0';
3217 		(void) strlcat(zc.zc_value, "@", sizeof (zc.zc_value));
3218 		(void) strlcat(zc.zc_value, snapname, sizeof (zc.zc_value));
3219 	}
3220 
3221 	err = ioctl(zhp->zfs_hdl->libzfs_fd, ZFS_IOC_SPACE_WRITTEN, &zc);
3222 	if (err)
3223 		return (err);
3224 
3225 	*propvalue = zc.zc_cookie;
3226 	return (0);
3227 }
3228 
3229 int
3230 zfs_prop_get_written(zfs_handle_t *zhp, const char *propname,
3231     char *propbuf, int proplen, boolean_t literal)
3232 {
3233 	int err;
3234 	uint64_t propvalue;
3235 
3236 	err = zfs_prop_get_written_int(zhp, propname, &propvalue);
3237 
3238 	if (err)
3239 		return (err);
3240 
3241 	if (literal) {
3242 		(void) snprintf(propbuf, proplen, "%llu", propvalue);
3243 	} else {
3244 		zfs_nicenum(propvalue, propbuf, proplen);
3245 	}
3246 	return (0);
3247 }
3248 
3249 /*
3250  * Returns the name of the given zfs handle.
3251  */
3252 const char *
3253 zfs_get_name(const zfs_handle_t *zhp)
3254 {
3255 	return (zhp->zfs_name);
3256 }
3257 
3258 /*
3259  * Returns the name of the parent pool for the given zfs handle.
3260  */
3261 const char *
3262 zfs_get_pool_name(const zfs_handle_t *zhp)
3263 {
3264 	return (zhp->zpool_hdl->zpool_name);
3265 }
3266 
3267 /*
3268  * Returns the type of the given zfs handle.
3269  */
3270 zfs_type_t
3271 zfs_get_type(const zfs_handle_t *zhp)
3272 {
3273 	return (zhp->zfs_type);
3274 }
3275 
3276 /*
3277  * Is one dataset name a child dataset of another?
3278  *
3279  * Needs to handle these cases:
3280  * Dataset 1	"a/foo"		"a/foo"		"a/foo"		"a/foo"
3281  * Dataset 2	"a/fo"		"a/foobar"	"a/bar/baz"	"a/foo/bar"
3282  * Descendant?	No.		No.		No.		Yes.
3283  */
3284 static boolean_t
3285 is_descendant(const char *ds1, const char *ds2)
3286 {
3287 	size_t d1len = strlen(ds1);
3288 
3289 	/* ds2 can't be a descendant if it's smaller */
3290 	if (strlen(ds2) < d1len)
3291 		return (B_FALSE);
3292 
3293 	/* otherwise, compare strings and verify that there's a '/' char */
3294 	return (ds2[d1len] == '/' && (strncmp(ds1, ds2, d1len) == 0));
3295 }
3296 
3297 /*
3298  * Given a complete name, return just the portion that refers to the parent.
3299  * Will return -1 if there is no parent (path is just the name of the
3300  * pool).
3301  */
3302 static int
3303 parent_name(const char *path, char *buf, size_t buflen)
3304 {
3305 	char *slashp;
3306 
3307 	(void) strlcpy(buf, path, buflen);
3308 
3309 	if ((slashp = strrchr(buf, '/')) == NULL)
3310 		return (-1);
3311 	*slashp = '\0';
3312 
3313 	return (0);
3314 }
3315 
3316 int
3317 zfs_parent_name(zfs_handle_t *zhp, char *buf, size_t buflen)
3318 {
3319 	return (parent_name(zfs_get_name(zhp), buf, buflen));
3320 }
3321 
3322 /*
3323  * If accept_ancestor is false, then check to make sure that the given path has
3324  * a parent, and that it exists.  If accept_ancestor is true, then find the
3325  * closest existing ancestor for the given path.  In prefixlen return the
3326  * length of already existing prefix of the given path.  We also fetch the
3327  * 'zoned' property, which is used to validate property settings when creating
3328  * new datasets.
3329  */
3330 static int
3331 check_parents(libzfs_handle_t *hdl, const char *path, uint64_t *zoned,
3332     boolean_t accept_ancestor, int *prefixlen)
3333 {
3334 	zfs_cmd_t zc = { 0 };
3335 	char parent[ZFS_MAX_DATASET_NAME_LEN];
3336 	char *slash;
3337 	zfs_handle_t *zhp;
3338 	char errbuf[1024];
3339 	uint64_t is_zoned;
3340 
3341 	(void) snprintf(errbuf, sizeof (errbuf),
3342 	    dgettext(TEXT_DOMAIN, "cannot create '%s'"), path);
3343 
3344 	/* get parent, and check to see if this is just a pool */
3345 	if (parent_name(path, parent, sizeof (parent)) != 0) {
3346 		zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
3347 		    "missing dataset name"));
3348 		return (zfs_error(hdl, EZFS_INVALIDNAME, errbuf));
3349 	}
3350 
3351 	/* check to see if the pool exists */
3352 	if ((slash = strchr(parent, '/')) == NULL)
3353 		slash = parent + strlen(parent);
3354 	(void) strncpy(zc.zc_name, parent, slash - parent);
3355 	zc.zc_name[slash - parent] = '\0';
3356 	if (ioctl(hdl->libzfs_fd, ZFS_IOC_OBJSET_STATS, &zc) != 0 &&
3357 	    errno == ENOENT) {
3358 		zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
3359 		    "no such pool '%s'"), zc.zc_name);
3360 		return (zfs_error(hdl, EZFS_NOENT, errbuf));
3361 	}
3362 
3363 	/* check to see if the parent dataset exists */
3364 	while ((zhp = make_dataset_handle(hdl, parent)) == NULL) {
3365 		if (errno == ENOENT && accept_ancestor) {
3366 			/*
3367 			 * Go deeper to find an ancestor, give up on top level.
3368 			 */
3369 			if (parent_name(parent, parent, sizeof (parent)) != 0) {
3370 				zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
3371 				    "no such pool '%s'"), zc.zc_name);
3372 				return (zfs_error(hdl, EZFS_NOENT, errbuf));
3373 			}
3374 		} else if (errno == ENOENT) {
3375 			zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
3376 			    "parent does not exist"));
3377 			return (zfs_error(hdl, EZFS_NOENT, errbuf));
3378 		} else
3379 			return (zfs_standard_error(hdl, errno, errbuf));
3380 	}
3381 
3382 	is_zoned = zfs_prop_get_int(zhp, ZFS_PROP_ZONED);
3383 	if (zoned != NULL)
3384 		*zoned = is_zoned;
3385 
3386 	/* we are in a non-global zone, but parent is in the global zone */
3387 	if (getzoneid() != GLOBAL_ZONEID && !is_zoned) {
3388 		(void) zfs_standard_error(hdl, EPERM, errbuf);
3389 		zfs_close(zhp);
3390 		return (-1);
3391 	}
3392 
3393 	/* make sure parent is a filesystem */
3394 	if (zfs_get_type(zhp) != ZFS_TYPE_FILESYSTEM) {
3395 		zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
3396 		    "parent is not a filesystem"));
3397 		(void) zfs_error(hdl, EZFS_BADTYPE, errbuf);
3398 		zfs_close(zhp);
3399 		return (-1);
3400 	}
3401 
3402 	zfs_close(zhp);
3403 	if (prefixlen != NULL)
3404 		*prefixlen = strlen(parent);
3405 	return (0);
3406 }
3407 
3408 /*
3409  * Finds whether the dataset of the given type(s) exists.
3410  */
3411 boolean_t
3412 zfs_dataset_exists(libzfs_handle_t *hdl, const char *path, zfs_type_t types)
3413 {
3414 	zfs_handle_t *zhp;
3415 
3416 	if (!zfs_validate_name(hdl, path, types, B_FALSE))
3417 		return (B_FALSE);
3418 
3419 	/*
3420 	 * Try to get stats for the dataset, which will tell us if it exists.
3421 	 */
3422 	if ((zhp = make_dataset_handle(hdl, path)) != NULL) {
3423 		int ds_type = zhp->zfs_type;
3424 
3425 		zfs_close(zhp);
3426 		if (types & ds_type)
3427 			return (B_TRUE);
3428 	}
3429 	return (B_FALSE);
3430 }
3431 
3432 /*
3433  * Given a path to 'target', create all the ancestors between
3434  * the prefixlen portion of the path, and the target itself.
3435  * Fail if the initial prefixlen-ancestor does not already exist.
3436  */
3437 int
3438 create_parents(libzfs_handle_t *hdl, char *target, int prefixlen)
3439 {
3440 	zfs_handle_t *h;
3441 	char *cp;
3442 	const char *opname;
3443 
3444 	/* make sure prefix exists */
3445 	cp = target + prefixlen;
3446 	if (*cp != '/') {
3447 		assert(strchr(cp, '/') == NULL);
3448 		h = zfs_open(hdl, target, ZFS_TYPE_FILESYSTEM);
3449 	} else {
3450 		*cp = '\0';
3451 		h = zfs_open(hdl, target, ZFS_TYPE_FILESYSTEM);
3452 		*cp = '/';
3453 	}
3454 	if (h == NULL)
3455 		return (-1);
3456 	zfs_close(h);
3457 
3458 	/*
3459 	 * Attempt to create, mount, and share any ancestor filesystems,
3460 	 * up to the prefixlen-long one.
3461 	 */
3462 	for (cp = target + prefixlen + 1;
3463 	    (cp = strchr(cp, '/')) != NULL; *cp = '/', cp++) {
3464 
3465 		*cp = '\0';
3466 
3467 		h = make_dataset_handle(hdl, target);
3468 		if (h) {
3469 			/* it already exists, nothing to do here */
3470 			zfs_close(h);
3471 			continue;
3472 		}
3473 
3474 		if (zfs_create(hdl, target, ZFS_TYPE_FILESYSTEM,
3475 		    NULL) != 0) {
3476 			opname = dgettext(TEXT_DOMAIN, "create");
3477 			goto ancestorerr;
3478 		}
3479 
3480 		h = zfs_open(hdl, target, ZFS_TYPE_FILESYSTEM);
3481 		if (h == NULL) {
3482 			opname = dgettext(TEXT_DOMAIN, "open");
3483 			goto ancestorerr;
3484 		}
3485 
3486 		if (zfs_mount(h, NULL, 0) != 0) {
3487 			opname = dgettext(TEXT_DOMAIN, "mount");
3488 			goto ancestorerr;
3489 		}
3490 
3491 		if (zfs_share(h) != 0) {
3492 			opname = dgettext(TEXT_DOMAIN, "share");
3493 			goto ancestorerr;
3494 		}
3495 
3496 		zfs_close(h);
3497 	}
3498 
3499 	return (0);
3500 
3501 ancestorerr:
3502 	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
3503 	    "failed to %s ancestor '%s'"), opname, target);
3504 	return (-1);
3505 }
3506 
3507 /*
3508  * Creates non-existing ancestors of the given path.
3509  */
3510 int
3511 zfs_create_ancestors(libzfs_handle_t *hdl, const char *path)
3512 {
3513 	int prefix;
3514 	char *path_copy;
3515 	char errbuf[1024];
3516 	int rc = 0;
3517 
3518 	(void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
3519 	    "cannot create '%s'"), path);
3520 
3521 	/*
3522 	 * Check that we are not passing the nesting limit
3523 	 * before we start creating any ancestors.
3524 	 */
3525 	if (dataset_nestcheck(path) != 0) {
3526 		zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
3527 		    "maximum name nesting depth exceeded"));
3528 		return (zfs_error(hdl, EZFS_INVALIDNAME, errbuf));
3529 	}
3530 
3531 	if (check_parents(hdl, path, NULL, B_TRUE, &prefix) != 0)
3532 		return (-1);
3533 
3534 	if ((path_copy = strdup(path)) != NULL) {
3535 		rc = create_parents(hdl, path_copy, prefix);
3536 		free(path_copy);
3537 	}
3538 	if (path_copy == NULL || rc != 0)
3539 		return (-1);
3540 
3541 	return (0);
3542 }
3543 
3544 /*
3545  * Create a new filesystem or volume.
3546  */
3547 int
3548 zfs_create(libzfs_handle_t *hdl, const char *path, zfs_type_t type,
3549     nvlist_t *props)
3550 {
3551 	int ret;
3552 	uint64_t size = 0;
3553 	uint64_t blocksize = zfs_prop_default_numeric(ZFS_PROP_VOLBLOCKSIZE);
3554 	uint8_t *wkeydata = NULL;
3555 	uint_t wkeylen = 0;
3556 	char errbuf[1024];
3557 	char parent[MAXNAMELEN];
3558 	uint64_t zoned;
3559 	enum lzc_dataset_type ost;
3560 	zpool_handle_t *zpool_handle;
3561 
3562 	(void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
3563 	    "cannot create '%s'"), path);
3564 
3565 	/* validate the path, taking care to note the extended error message */
3566 	if (!zfs_validate_name(hdl, path, type, B_TRUE))
3567 		return (zfs_error(hdl, EZFS_INVALIDNAME, errbuf));
3568 
3569 	if (dataset_nestcheck(path) != 0) {
3570 		zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
3571 		    "maximum name nesting depth exceeded"));
3572 		return (zfs_error(hdl, EZFS_INVALIDNAME, errbuf));
3573 	}
3574 
3575 	/* validate parents exist */
3576 	if (check_parents(hdl, path, &zoned, B_FALSE, NULL) != 0)
3577 		return (-1);
3578 
3579 	/*
3580 	 * The failure modes when creating a dataset of a different type over
3581 	 * one that already exists is a little strange.  In particular, if you
3582 	 * try to create a dataset on top of an existing dataset, the ioctl()
3583 	 * will return ENOENT, not EEXIST.  To prevent this from happening, we
3584 	 * first try to see if the dataset exists.
3585 	 */
3586 	if (zfs_dataset_exists(hdl, path, ZFS_TYPE_DATASET)) {
3587 		zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
3588 		    "dataset already exists"));
3589 		return (zfs_error(hdl, EZFS_EXISTS, errbuf));
3590 	}
3591 
3592 	if (type == ZFS_TYPE_VOLUME)
3593 		ost = LZC_DATSET_TYPE_ZVOL;
3594 	else
3595 		ost = LZC_DATSET_TYPE_ZFS;
3596 
3597 	/* open zpool handle for prop validation */
3598 	char pool_path[ZFS_MAX_DATASET_NAME_LEN];
3599 	(void) strlcpy(pool_path, path, sizeof (pool_path));
3600 
3601 	/* truncate pool_path at first slash */
3602 	char *p = strchr(pool_path, '/');
3603 	if (p != NULL)
3604 		*p = '\0';
3605 
3606 	if ((zpool_handle = zpool_open(hdl, pool_path)) == NULL)
3607 		return (-1);
3608 
3609 	if (props && (props = zfs_valid_proplist(hdl, type, props,
3610 	    zoned, NULL, zpool_handle, B_TRUE, errbuf)) == 0) {
3611 		zpool_close(zpool_handle);
3612 		return (-1);
3613 	}
3614 	zpool_close(zpool_handle);
3615 
3616 	if (type == ZFS_TYPE_VOLUME) {
3617 		/*
3618 		 * If we are creating a volume, the size and block size must
3619 		 * satisfy a few restraints.  First, the blocksize must be a
3620 		 * valid block size between SPA_{MIN,MAX}BLOCKSIZE.  Second, the
3621 		 * volsize must be a multiple of the block size, and cannot be
3622 		 * zero.
3623 		 */
3624 		if (props == NULL || nvlist_lookup_uint64(props,
3625 		    zfs_prop_to_name(ZFS_PROP_VOLSIZE), &size) != 0) {
3626 			nvlist_free(props);
3627 			zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
3628 			    "missing volume size"));
3629 			return (zfs_error(hdl, EZFS_BADPROP, errbuf));
3630 		}
3631 
3632 		if ((ret = nvlist_lookup_uint64(props,
3633 		    zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE),
3634 		    &blocksize)) != 0) {
3635 			if (ret == ENOENT) {
3636 				blocksize = zfs_prop_default_numeric(
3637 				    ZFS_PROP_VOLBLOCKSIZE);
3638 			} else {
3639 				nvlist_free(props);
3640 				zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
3641 				    "missing volume block size"));
3642 				return (zfs_error(hdl, EZFS_BADPROP, errbuf));
3643 			}
3644 		}
3645 
3646 		if (size == 0) {
3647 			nvlist_free(props);
3648 			zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
3649 			    "volume size cannot be zero"));
3650 			return (zfs_error(hdl, EZFS_BADPROP, errbuf));
3651 		}
3652 
3653 		if (size % blocksize != 0) {
3654 			nvlist_free(props);
3655 			zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
3656 			    "volume size must be a multiple of volume block "
3657 			    "size"));
3658 			return (zfs_error(hdl, EZFS_BADPROP, errbuf));
3659 		}
3660 	}
3661 
3662 	(void) parent_name(path, parent, sizeof (parent));
3663 	if (zfs_crypto_create(hdl, parent, props, NULL, B_TRUE,
3664 	    &wkeydata, &wkeylen) != 0) {
3665 		nvlist_free(props);
3666 		return (zfs_error(hdl, EZFS_CRYPTOFAILED, errbuf));
3667 	}
3668 
3669 	/* create the dataset */
3670 	ret = lzc_create(path, ost, props, wkeydata, wkeylen);
3671 	nvlist_free(props);
3672 	if (wkeydata != NULL)
3673 		free(wkeydata);
3674 
3675 	/* check for failure */
3676 	if (ret != 0) {
3677 		switch (errno) {
3678 		case ENOENT:
3679 			zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
3680 			    "no such parent '%s'"), parent);
3681 			return (zfs_error(hdl, EZFS_NOENT, errbuf));
3682 
3683 		case EINVAL:
3684 			zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
3685 			    "parent '%s' is not a filesystem"), parent);
3686 			return (zfs_error(hdl, EZFS_BADTYPE, errbuf));
3687 
3688 		case ENOTSUP:
3689 			zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
3690 			    "pool must be upgraded to set this "
3691 			    "property or value"));
3692 			return (zfs_error(hdl, EZFS_BADVERSION, errbuf));
3693 		case ERANGE:
3694 			zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
3695 			    "invalid property value(s) specified"));
3696 			return (zfs_error(hdl, EZFS_BADPROP, errbuf));
3697 		case EACCES:
3698 			zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
3699 			    "encryption root's key is not loaded "
3700 			    "or provided"));
3701 			return (zfs_error(hdl, EZFS_CRYPTOFAILED, errbuf));
3702 
3703 #ifdef _ILP32
3704 		case EOVERFLOW:
3705 			/*
3706 			 * This platform can't address a volume this big.
3707 			 */
3708 			if (type == ZFS_TYPE_VOLUME)
3709 				return (zfs_error(hdl, EZFS_VOLTOOBIG,
3710 				    errbuf));
3711 #endif
3712 			/* FALLTHROUGH */
3713 		default:
3714 			return (zfs_standard_error(hdl, errno, errbuf));
3715 		}
3716 	}
3717 
3718 	return (0);
3719 }
3720 
3721 /*
3722  * Destroys the given dataset.  The caller must make sure that the filesystem
3723  * isn't mounted, and that there are no active dependents. If the file system
3724  * does not exist this function does nothing.
3725  */
3726 int
3727 zfs_destroy(zfs_handle_t *zhp, boolean_t defer)
3728 {
3729 	int error;
3730 
3731 	if (zhp->zfs_type != ZFS_TYPE_SNAPSHOT && defer)
3732 		return (EINVAL);
3733 
3734 	if (zhp->zfs_type == ZFS_TYPE_BOOKMARK) {
3735 		nvlist_t *nv = fnvlist_alloc();
3736 		fnvlist_add_boolean(nv, zhp->zfs_name);
3737 		error = lzc_destroy_bookmarks(nv, NULL);
3738 		fnvlist_free(nv);
3739 		if (error != 0) {
3740 			return (zfs_standard_error_fmt(zhp->zfs_hdl, error,
3741 			    dgettext(TEXT_DOMAIN, "cannot destroy '%s'"),
3742 			    zhp->zfs_name));
3743 		}
3744 		return (0);
3745 	}
3746 
3747 	if (zhp->zfs_type == ZFS_TYPE_SNAPSHOT) {
3748 		nvlist_t *nv = fnvlist_alloc();
3749 		fnvlist_add_boolean(nv, zhp->zfs_name);
3750 		error = lzc_destroy_snaps(nv, defer, NULL);
3751 		fnvlist_free(nv);
3752 	} else {
3753 		error = lzc_destroy(zhp->zfs_name);
3754 	}
3755 
3756 	if (error != 0 && error != ENOENT) {
3757 		return (zfs_standard_error_fmt(zhp->zfs_hdl, errno,
3758 		    dgettext(TEXT_DOMAIN, "cannot destroy '%s'"),
3759 		    zhp->zfs_name));
3760 	}
3761 
3762 	remove_mountpoint(zhp);
3763 
3764 	return (0);
3765 }
3766 
3767 struct destroydata {
3768 	nvlist_t *nvl;
3769 	const char *snapname;
3770 };
3771 
3772 static int
3773 zfs_check_snap_cb(zfs_handle_t *zhp, void *arg)
3774 {
3775 	struct destroydata *dd = arg;
3776 	char name[ZFS_MAX_DATASET_NAME_LEN];
3777 	int rv = 0;
3778 
3779 	(void) snprintf(name, sizeof (name),
3780 	    "%s@%s", zhp->zfs_name, dd->snapname);
3781 
3782 	if (lzc_exists(name))
3783 		verify(nvlist_add_boolean(dd->nvl, name) == 0);
3784 
3785 	rv = zfs_iter_filesystems(zhp, zfs_check_snap_cb, dd);
3786 	zfs_close(zhp);
3787 	return (rv);
3788 }
3789 
3790 /*
3791  * Destroys all snapshots with the given name in zhp & descendants.
3792  */
3793 int
3794 zfs_destroy_snaps(zfs_handle_t *zhp, char *snapname, boolean_t defer)
3795 {
3796 	int ret;
3797 	struct destroydata dd = { 0 };
3798 
3799 	dd.snapname = snapname;
3800 	verify(nvlist_alloc(&dd.nvl, NV_UNIQUE_NAME, 0) == 0);
3801 	(void) zfs_check_snap_cb(zfs_handle_dup(zhp), &dd);
3802 
3803 	if (nvlist_empty(dd.nvl)) {
3804 		ret = zfs_standard_error_fmt(zhp->zfs_hdl, ENOENT,
3805 		    dgettext(TEXT_DOMAIN, "cannot destroy '%s@%s'"),
3806 		    zhp->zfs_name, snapname);
3807 	} else {
3808 		ret = zfs_destroy_snaps_nvl(zhp->zfs_hdl, dd.nvl, defer);
3809 	}
3810 	nvlist_free(dd.nvl);
3811 	return (ret);
3812 }
3813 
3814 /*
3815  * Destroys all the snapshots named in the nvlist.
3816  */
3817 int
3818 zfs_destroy_snaps_nvl(libzfs_handle_t *hdl, nvlist_t *snaps, boolean_t defer)
3819 {
3820 	int ret;
3821 	nvlist_t *errlist = NULL;
3822 
3823 	ret = lzc_destroy_snaps(snaps, defer, &errlist);
3824 
3825 	if (ret == 0) {
3826 		nvlist_free(errlist);
3827 		return (0);
3828 	}
3829 
3830 	if (nvlist_empty(errlist)) {
3831 		char errbuf[1024];
3832 		(void) snprintf(errbuf, sizeof (errbuf),
3833 		    dgettext(TEXT_DOMAIN, "cannot destroy snapshots"));
3834 
3835 		ret = zfs_standard_error(hdl, ret, errbuf);
3836 	}
3837 	for (nvpair_t *pair = nvlist_next_nvpair(errlist, NULL);
3838 	    pair != NULL; pair = nvlist_next_nvpair(errlist, pair)) {
3839 		char errbuf[1024];
3840 		(void) snprintf(errbuf, sizeof (errbuf),
3841 		    dgettext(TEXT_DOMAIN, "cannot destroy snapshot %s"),
3842 		    nvpair_name(pair));
3843 
3844 		switch (fnvpair_value_int32(pair)) {
3845 		case EEXIST:
3846 			zfs_error_aux(hdl,
3847 			    dgettext(TEXT_DOMAIN, "snapshot is cloned"));
3848 			ret = zfs_error(hdl, EZFS_EXISTS, errbuf);
3849 			break;
3850 		default:
3851 			ret = zfs_standard_error(hdl, errno, errbuf);
3852 			break;
3853 		}
3854 	}
3855 
3856 	nvlist_free(errlist);
3857 	return (ret);
3858 }
3859 
3860 /*
3861  * Clones the given dataset.  The target must be of the same type as the source.
3862  */
3863 int
3864 zfs_clone(zfs_handle_t *zhp, const char *target, nvlist_t *props)
3865 {
3866 	char parent[ZFS_MAX_DATASET_NAME_LEN];
3867 	int ret;
3868 	char errbuf[1024];
3869 	libzfs_handle_t *hdl = zhp->zfs_hdl;
3870 	uint64_t zoned;
3871 
3872 	assert(zhp->zfs_type == ZFS_TYPE_SNAPSHOT);
3873 
3874 	(void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
3875 	    "cannot create '%s'"), target);
3876 
3877 	/* validate the target/clone name */
3878 	if (!zfs_validate_name(hdl, target, ZFS_TYPE_FILESYSTEM, B_TRUE))
3879 		return (zfs_error(hdl, EZFS_INVALIDNAME, errbuf));
3880 
3881 	/* validate parents exist */
3882 	if (check_parents(hdl, target, &zoned, B_FALSE, NULL) != 0)
3883 		return (-1);
3884 
3885 	(void) parent_name(target, parent, sizeof (parent));
3886 
3887 	/* do the clone */
3888 
3889 	if (props) {
3890 		zfs_type_t type;
3891 
3892 		if (ZFS_IS_VOLUME(zhp)) {
3893 			type = ZFS_TYPE_VOLUME;
3894 		} else {
3895 			type = ZFS_TYPE_FILESYSTEM;
3896 		}
3897 		if ((props = zfs_valid_proplist(hdl, type, props, zoned,
3898 		    zhp, zhp->zpool_hdl, B_TRUE, errbuf)) == NULL)
3899 			return (-1);
3900 		if (zfs_fix_auto_resv(zhp, props) == -1) {
3901 			nvlist_free(props);
3902 			return (-1);
3903 		}
3904 	}
3905 
3906 	if (zfs_crypto_clone_check(hdl, zhp, parent, props) != 0) {
3907 		nvlist_free(props);
3908 		return (zfs_error(hdl, EZFS_CRYPTOFAILED, errbuf));
3909 	}
3910 
3911 	ret = lzc_clone(target, zhp->zfs_name, props);
3912 	nvlist_free(props);
3913 
3914 	if (ret != 0) {
3915 		switch (errno) {
3916 
3917 		case ENOENT:
3918 			/*
3919 			 * The parent doesn't exist.  We should have caught this
3920 			 * above, but there may a race condition that has since
3921 			 * destroyed the parent.
3922 			 *
3923 			 * At this point, we don't know whether it's the source
3924 			 * that doesn't exist anymore, or whether the target
3925 			 * dataset doesn't exist.
3926 			 */
3927 			zfs_error_aux(zhp->zfs_hdl, dgettext(TEXT_DOMAIN,
3928 			    "no such parent '%s'"), parent);
3929 			return (zfs_error(zhp->zfs_hdl, EZFS_NOENT, errbuf));
3930 
3931 		case EXDEV:
3932 			zfs_error_aux(zhp->zfs_hdl, dgettext(TEXT_DOMAIN,
3933 			    "source and target pools differ"));
3934 			return (zfs_error(zhp->zfs_hdl, EZFS_CROSSTARGET,
3935 			    errbuf));
3936 
3937 		default:
3938 			return (zfs_standard_error(zhp->zfs_hdl, errno,
3939 			    errbuf));
3940 		}
3941 	}
3942 
3943 	return (ret);
3944 }
3945 
3946 /*
3947  * Promotes the given clone fs to be the clone parent.
3948  */
3949 int
3950 zfs_promote(zfs_handle_t *zhp)
3951 {
3952 	libzfs_handle_t *hdl = zhp->zfs_hdl;
3953 	char snapname[ZFS_MAX_DATASET_NAME_LEN];
3954 	int ret;
3955 	char errbuf[1024];
3956 
3957 	(void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
3958 	    "cannot promote '%s'"), zhp->zfs_name);
3959 
3960 	if (zhp->zfs_type == ZFS_TYPE_SNAPSHOT) {
3961 		zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
3962 		    "snapshots can not be promoted"));
3963 		return (zfs_error(hdl, EZFS_BADTYPE, errbuf));
3964 	}
3965 
3966 	if (zhp->zfs_dmustats.dds_origin[0] == '\0') {
3967 		zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
3968 		    "not a cloned filesystem"));
3969 		return (zfs_error(hdl, EZFS_BADTYPE, errbuf));
3970 	}
3971 
3972 	if (!zfs_validate_name(hdl, zhp->zfs_name, zhp->zfs_type, B_TRUE))
3973 		return (zfs_error(hdl, EZFS_INVALIDNAME, errbuf));
3974 
3975 	ret = lzc_promote(zhp->zfs_name, snapname, sizeof (snapname));
3976 
3977 	if (ret != 0) {
3978 		switch (ret) {
3979 		case EEXIST:
3980 			/* There is a conflicting snapshot name. */
3981 			zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
3982 			    "conflicting snapshot '%s' from parent '%s'"),
3983 			    snapname, zhp->zfs_dmustats.dds_origin);
3984 			return (zfs_error(hdl, EZFS_EXISTS, errbuf));
3985 
3986 		default:
3987 			return (zfs_standard_error(hdl, ret, errbuf));
3988 		}
3989 	}
3990 	return (ret);
3991 }
3992 
3993 typedef struct snapdata {
3994 	nvlist_t *sd_nvl;
3995 	const char *sd_snapname;
3996 } snapdata_t;
3997 
3998 static int
3999 zfs_snapshot_cb(zfs_handle_t *zhp, void *arg)
4000 {
4001 	snapdata_t *sd = arg;
4002 	char name[ZFS_MAX_DATASET_NAME_LEN];
4003 	int rv = 0;
4004 
4005 	if (zfs_prop_get_int(zhp, ZFS_PROP_INCONSISTENT) == 0) {
4006 		(void) snprintf(name, sizeof (name),
4007 		    "%s@%s", zfs_get_name(zhp), sd->sd_snapname);
4008 
4009 		fnvlist_add_boolean(sd->sd_nvl, name);
4010 
4011 		rv = zfs_iter_filesystems(zhp, zfs_snapshot_cb, sd);
4012 	}
4013 	zfs_close(zhp);
4014 
4015 	return (rv);
4016 }
4017 
4018 int
4019 zfs_remap_indirects(libzfs_handle_t *hdl, const char *fs)
4020 {
4021 	int err;
4022 	char errbuf[1024];
4023 
4024 	(void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
4025 	    "cannot remap dataset '%s'"), fs);
4026 
4027 	err = lzc_remap(fs);
4028 
4029 	if (err != 0) {
4030 		switch (err) {
4031 		case ENOTSUP:
4032 			zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
4033 			    "pool must be upgraded"));
4034 			(void) zfs_error(hdl, EZFS_BADVERSION, errbuf);
4035 			break;
4036 		case EINVAL:
4037 			(void) zfs_error(hdl, EZFS_BADTYPE, errbuf);
4038 			break;
4039 		default:
4040 			(void) zfs_standard_error(hdl, err, errbuf);
4041 			break;
4042 		}
4043 	}
4044 
4045 	return (err);
4046 }
4047 
4048 /*
4049  * Creates snapshots.  The keys in the snaps nvlist are the snapshots to be
4050  * created.
4051  */
4052 int
4053 zfs_snapshot_nvl(libzfs_handle_t *hdl, nvlist_t *snaps, nvlist_t *props)
4054 {
4055 	int ret;
4056 	char errbuf[1024];
4057 	nvpair_t *elem;
4058 	nvlist_t *errors;
4059 
4060 	(void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
4061 	    "cannot create snapshots "));
4062 
4063 	elem = NULL;
4064 	while ((elem = nvlist_next_nvpair(snaps, elem)) != NULL) {
4065 		const char *snapname = nvpair_name(elem);
4066 
4067 		/* validate the target name */
4068 		if (!zfs_validate_name(hdl, snapname, ZFS_TYPE_SNAPSHOT,
4069 		    B_TRUE)) {
4070 			(void) snprintf(errbuf, sizeof (errbuf),
4071 			    dgettext(TEXT_DOMAIN,
4072 			    "cannot create snapshot '%s'"), snapname);
4073 			return (zfs_error(hdl, EZFS_INVALIDNAME, errbuf));
4074 		}
4075 	}
4076 
4077 	/*
4078 	 * get pool handle for prop validation. assumes all snaps are in the
4079 	 * same pool, as does lzc_snapshot (below).
4080 	 */
4081 	char pool[ZFS_MAX_DATASET_NAME_LEN];
4082 	elem = nvlist_next_nvpair(snaps, NULL);
4083 	(void) strlcpy(pool, nvpair_name(elem), sizeof (pool));
4084 	pool[strcspn(pool, "/@")] = '\0';
4085 	zpool_handle_t *zpool_hdl = zpool_open(hdl, pool);
4086 
4087 	if (props != NULL &&
4088 	    (props = zfs_valid_proplist(hdl, ZFS_TYPE_SNAPSHOT,
4089 	    props, B_FALSE, NULL, zpool_hdl, B_FALSE, errbuf)) == NULL) {
4090 		zpool_close(zpool_hdl);
4091 		return (-1);
4092 	}
4093 	zpool_close(zpool_hdl);
4094 
4095 	ret = lzc_snapshot(snaps, props, &errors);
4096 
4097 	if (ret != 0) {
4098 		boolean_t printed = B_FALSE;
4099 		for (elem = nvlist_next_nvpair(errors, NULL);
4100 		    elem != NULL;
4101 		    elem = nvlist_next_nvpair(errors, elem)) {
4102 			(void) snprintf(errbuf, sizeof (errbuf),
4103 			    dgettext(TEXT_DOMAIN,
4104 			    "cannot create snapshot '%s'"), nvpair_name(elem));
4105 			(void) zfs_standard_error(hdl,
4106 			    fnvpair_value_int32(elem), errbuf);
4107 			printed = B_TRUE;
4108 		}
4109 		if (!printed) {
4110 			switch (ret) {
4111 			case EXDEV:
4112 				zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
4113 				    "multiple snapshots of same "
4114 				    "fs not allowed"));
4115 				(void) zfs_error(hdl, EZFS_EXISTS, errbuf);
4116 
4117 				break;
4118 			default:
4119 				(void) zfs_standard_error(hdl, ret, errbuf);
4120 			}
4121 		}
4122 	}
4123 
4124 	nvlist_free(props);
4125 	nvlist_free(errors);
4126 	return (ret);
4127 }
4128 
4129 int
4130 zfs_snapshot(libzfs_handle_t *hdl, const char *path, boolean_t recursive,
4131     nvlist_t *props)
4132 {
4133 	int ret;
4134 	snapdata_t sd = { 0 };
4135 	char fsname[ZFS_MAX_DATASET_NAME_LEN];
4136 	char *cp;
4137 	zfs_handle_t *zhp;
4138 	char errbuf[1024];
4139 
4140 	(void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
4141 	    "cannot snapshot %s"), path);
4142 
4143 	if (!zfs_validate_name(hdl, path, ZFS_TYPE_SNAPSHOT, B_TRUE))
4144 		return (zfs_error(hdl, EZFS_INVALIDNAME, errbuf));
4145 
4146 	(void) strlcpy(fsname, path, sizeof (fsname));
4147 	cp = strchr(fsname, '@');
4148 	*cp = '\0';
4149 	sd.sd_snapname = cp + 1;
4150 
4151 	if ((zhp = zfs_open(hdl, fsname, ZFS_TYPE_FILESYSTEM |
4152 	    ZFS_TYPE_VOLUME)) == NULL) {
4153 		return (-1);
4154 	}
4155 
4156 	verify(nvlist_alloc(&sd.sd_nvl, NV_UNIQUE_NAME, 0) == 0);
4157 	if (recursive) {
4158 		(void) zfs_snapshot_cb(zfs_handle_dup(zhp), &sd);
4159 	} else {
4160 		fnvlist_add_boolean(sd.sd_nvl, path);
4161 	}
4162 
4163 	ret = zfs_snapshot_nvl(hdl, sd.sd_nvl, props);
4164 	nvlist_free(sd.sd_nvl);
4165 	zfs_close(zhp);
4166 	return (ret);
4167 }
4168 
4169 /*
4170  * Destroy any more recent snapshots.  We invoke this callback on any dependents
4171  * of the snapshot first.  If the 'cb_dependent' member is non-zero, then this
4172  * is a dependent and we should just destroy it without checking the transaction
4173  * group.
4174  */
4175 typedef struct rollback_data {
4176 	const char	*cb_target;		/* the snapshot */
4177 	uint64_t	cb_create;		/* creation time reference */
4178 	boolean_t	cb_error;
4179 	boolean_t	cb_force;
4180 } rollback_data_t;
4181 
4182 static int
4183 rollback_destroy_dependent(zfs_handle_t *zhp, void *data)
4184 {
4185 	rollback_data_t *cbp = data;
4186 	prop_changelist_t *clp;
4187 
4188 	/* We must destroy this clone; first unmount it */
4189 	clp = changelist_gather(zhp, ZFS_PROP_NAME, 0,
4190 	    cbp->cb_force ? MS_FORCE: 0);
4191 	if (clp == NULL || changelist_prefix(clp) != 0) {
4192 		cbp->cb_error = B_TRUE;
4193 		zfs_close(zhp);
4194 		return (0);
4195 	}
4196 	if (zfs_destroy(zhp, B_FALSE) != 0)
4197 		cbp->cb_error = B_TRUE;
4198 	else
4199 		changelist_remove(clp, zhp->zfs_name);
4200 	(void) changelist_postfix(clp);
4201 	changelist_free(clp);
4202 
4203 	zfs_close(zhp);
4204 	return (0);
4205 }
4206 
4207 static int
4208 rollback_destroy(zfs_handle_t *zhp, void *data)
4209 {
4210 	rollback_data_t *cbp = data;
4211 
4212 	if (zfs_prop_get_int(zhp, ZFS_PROP_CREATETXG) > cbp->cb_create) {
4213 		cbp->cb_error |= zfs_iter_dependents(zhp, B_FALSE,
4214 		    rollback_destroy_dependent, cbp);
4215 
4216 		cbp->cb_error |= zfs_destroy(zhp, B_FALSE);
4217 	}
4218 
4219 	zfs_close(zhp);
4220 	return (0);
4221 }
4222 
4223 /*
4224  * Given a dataset, rollback to a specific snapshot, discarding any
4225  * data changes since then and making it the active dataset.
4226  *
4227  * Any snapshots and bookmarks more recent than the target are
4228  * destroyed, along with their dependents (i.e. clones).
4229  */
4230 int
4231 zfs_rollback(zfs_handle_t *zhp, zfs_handle_t *snap, boolean_t force)
4232 {
4233 	rollback_data_t cb = { 0 };
4234 	int err;
4235 	boolean_t restore_resv = 0;
4236 	uint64_t old_volsize = 0, new_volsize;
4237 	zfs_prop_t resv_prop;
4238 
4239 	assert(zhp->zfs_type == ZFS_TYPE_FILESYSTEM ||
4240 	    zhp->zfs_type == ZFS_TYPE_VOLUME);
4241 
4242 	/*
4243 	 * Destroy all recent snapshots and their dependents.
4244 	 */
4245 	cb.cb_force = force;
4246 	cb.cb_target = snap->zfs_name;
4247 	cb.cb_create = zfs_prop_get_int(snap, ZFS_PROP_CREATETXG);
4248 	(void) zfs_iter_snapshots(zhp, B_FALSE, rollback_destroy, &cb);
4249 	(void) zfs_iter_bookmarks(zhp, rollback_destroy, &cb);
4250 
4251 	if (cb.cb_error)
4252 		return (-1);
4253 
4254 	/*
4255 	 * Now that we have verified that the snapshot is the latest,
4256 	 * rollback to the given snapshot.
4257 	 */
4258 
4259 	if (zhp->zfs_type == ZFS_TYPE_VOLUME) {
4260 		if (zfs_which_resv_prop(zhp, &resv_prop) < 0)
4261 			return (-1);
4262 		old_volsize = zfs_prop_get_int(zhp, ZFS_PROP_VOLSIZE);
4263 		restore_resv =
4264 		    (old_volsize == zfs_prop_get_int(zhp, resv_prop));
4265 	}
4266 
4267 	/*
4268 	 * Pass both the filesystem and the wanted snapshot names,
4269 	 * we would get an error back if the snapshot is destroyed or
4270 	 * a new snapshot is created before this request is processed.
4271 	 */
4272 	err = lzc_rollback_to(zhp->zfs_name, snap->zfs_name);
4273 	if (err != 0) {
4274 		char errbuf[1024];
4275 
4276 		(void) snprintf(errbuf, sizeof (errbuf),
4277 		    dgettext(TEXT_DOMAIN, "cannot rollback '%s'"),
4278 		    zhp->zfs_name);
4279 		switch (err) {
4280 		case EEXIST:
4281 			zfs_error_aux(zhp->zfs_hdl, dgettext(TEXT_DOMAIN,
4282 			    "there is a snapshot or bookmark more recent "
4283 			    "than '%s'"), snap->zfs_name);
4284 			(void) zfs_error(zhp->zfs_hdl, EZFS_EXISTS, errbuf);
4285 			break;
4286 		case ESRCH:
4287 			zfs_error_aux(zhp->zfs_hdl, dgettext(TEXT_DOMAIN,
4288 			    "'%s' is not found among snapshots of '%s'"),
4289 			    snap->zfs_name, zhp->zfs_name);
4290 			(void) zfs_error(zhp->zfs_hdl, EZFS_NOENT, errbuf);
4291 			break;
4292 		case EINVAL:
4293 			(void) zfs_error(zhp->zfs_hdl, EZFS_BADTYPE, errbuf);
4294 			break;
4295 		default:
4296 			(void) zfs_standard_error(zhp->zfs_hdl, err, errbuf);
4297 		}
4298 		return (err);
4299 	}
4300 
4301 	/*
4302 	 * For volumes, if the pre-rollback volsize matched the pre-
4303 	 * rollback reservation and the volsize has changed then set
4304 	 * the reservation property to the post-rollback volsize.
4305 	 * Make a new handle since the rollback closed the dataset.
4306 	 */
4307 	if ((zhp->zfs_type == ZFS_TYPE_VOLUME) &&
4308 	    (zhp = make_dataset_handle(zhp->zfs_hdl, zhp->zfs_name))) {
4309 		if (restore_resv) {
4310 			new_volsize = zfs_prop_get_int(zhp, ZFS_PROP_VOLSIZE);
4311 			if (old_volsize != new_volsize)
4312 				err = zfs_prop_set_int(zhp, resv_prop,
4313 				    new_volsize);
4314 		}
4315 		zfs_close(zhp);
4316 	}
4317 	return (err);
4318 }
4319 
4320 /*
4321  * Renames the given dataset.
4322  */
4323 int
4324 zfs_rename(zfs_handle_t *zhp, const char *target, boolean_t recursive,
4325     boolean_t force_unmount)
4326 {
4327 	int ret = 0;
4328 	zfs_cmd_t zc = { 0 };
4329 	char *delim;
4330 	prop_changelist_t *cl = NULL;
4331 	zfs_handle_t *zhrp = NULL;
4332 	char *parentname = NULL;
4333 	char parent[ZFS_MAX_DATASET_NAME_LEN];
4334 	libzfs_handle_t *hdl = zhp->zfs_hdl;
4335 	char errbuf[1024];
4336 
4337 	/* if we have the same exact name, just return success */
4338 	if (strcmp(zhp->zfs_name, target) == 0)
4339 		return (0);
4340 
4341 	(void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
4342 	    "cannot rename to '%s'"), target);
4343 
4344 	/* make sure source name is valid */
4345 	if (!zfs_validate_name(hdl, zhp->zfs_name, zhp->zfs_type, B_TRUE))
4346 		return (zfs_error(hdl, EZFS_INVALIDNAME, errbuf));
4347 
4348 	/*
4349 	 * Make sure the target name is valid
4350 	 */
4351 	if (zhp->zfs_type == ZFS_TYPE_SNAPSHOT) {
4352 		if ((strchr(target, '@') == NULL) ||
4353 		    *target == '@') {
4354 			/*
4355 			 * Snapshot target name is abbreviated,
4356 			 * reconstruct full dataset name
4357 			 */
4358 			(void) strlcpy(parent, zhp->zfs_name,
4359 			    sizeof (parent));
4360 			delim = strchr(parent, '@');
4361 			if (strchr(target, '@') == NULL)
4362 				*(++delim) = '\0';
4363 			else
4364 				*delim = '\0';
4365 			(void) strlcat(parent, target, sizeof (parent));
4366 			target = parent;
4367 		} else {
4368 			/*
4369 			 * Make sure we're renaming within the same dataset.
4370 			 */
4371 			delim = strchr(target, '@');
4372 			if (strncmp(zhp->zfs_name, target, delim - target)
4373 			    != 0 || zhp->zfs_name[delim - target] != '@') {
4374 				zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
4375 				    "snapshots must be part of same "
4376 				    "dataset"));
4377 				return (zfs_error(hdl, EZFS_CROSSTARGET,
4378 				    errbuf));
4379 			}
4380 		}
4381 
4382 		if (!zfs_validate_name(hdl, target, zhp->zfs_type, B_TRUE))
4383 			return (zfs_error(hdl, EZFS_INVALIDNAME, errbuf));
4384 	} else {
4385 		if (recursive) {
4386 			zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
4387 			    "recursive rename must be a snapshot"));
4388 			return (zfs_error(hdl, EZFS_BADTYPE, errbuf));
4389 		}
4390 
4391 		if (!zfs_validate_name(hdl, target, zhp->zfs_type, B_TRUE))
4392 			return (zfs_error(hdl, EZFS_INVALIDNAME, errbuf));
4393 
4394 		/* validate parents */
4395 		if (check_parents(hdl, target, NULL, B_FALSE, NULL) != 0)
4396 			return (-1);
4397 
4398 		/* make sure we're in the same pool */
4399 		verify((delim = strchr(target, '/')) != NULL);
4400 		if (strncmp(zhp->zfs_name, target, delim - target) != 0 ||
4401 		    zhp->zfs_name[delim - target] != '/') {
4402 			zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
4403 			    "datasets must be within same pool"));
4404 			return (zfs_error(hdl, EZFS_CROSSTARGET, errbuf));
4405 		}
4406 
4407 		/* new name cannot be a child of the current dataset name */
4408 		if (is_descendant(zhp->zfs_name, target)) {
4409 			zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
4410 			    "New dataset name cannot be a descendant of "
4411 			    "current dataset name"));
4412 			return (zfs_error(hdl, EZFS_INVALIDNAME, errbuf));
4413 		}
4414 	}
4415 
4416 	(void) snprintf(errbuf, sizeof (errbuf),
4417 	    dgettext(TEXT_DOMAIN, "cannot rename '%s'"), zhp->zfs_name);
4418 
4419 	if (getzoneid() == GLOBAL_ZONEID &&
4420 	    zfs_prop_get_int(zhp, ZFS_PROP_ZONED)) {
4421 		zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
4422 		    "dataset is used in a non-global zone"));
4423 		return (zfs_error(hdl, EZFS_ZONED, errbuf));
4424 	}
4425 
4426 	if (recursive) {
4427 		parentname = zfs_strdup(zhp->zfs_hdl, zhp->zfs_name);
4428 		if (parentname == NULL) {
4429 			ret = -1;
4430 			goto error;
4431 		}
4432 		delim = strchr(parentname, '@');
4433 		*delim = '\0';
4434 		zhrp = zfs_open(zhp->zfs_hdl, parentname, ZFS_TYPE_DATASET);
4435 		if (zhrp == NULL) {
4436 			ret = -1;
4437 			goto error;
4438 		}
4439 	} else if (zhp->zfs_type != ZFS_TYPE_SNAPSHOT) {
4440 		if ((cl = changelist_gather(zhp, ZFS_PROP_NAME, 0,
4441 		    force_unmount ? MS_FORCE : 0)) == NULL)
4442 			return (-1);
4443 
4444 		if (changelist_haszonedchild(cl)) {
4445 			zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
4446 			    "child dataset with inherited mountpoint is used "
4447 			    "in a non-global zone"));
4448 			(void) zfs_error(hdl, EZFS_ZONED, errbuf);
4449 			ret = -1;
4450 			goto error;
4451 		}
4452 
4453 		if ((ret = changelist_prefix(cl)) != 0)
4454 			goto error;
4455 	}
4456 
4457 	if (ZFS_IS_VOLUME(zhp))
4458 		zc.zc_objset_type = DMU_OST_ZVOL;
4459 	else
4460 		zc.zc_objset_type = DMU_OST_ZFS;
4461 
4462 	(void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));
4463 	(void) strlcpy(zc.zc_value, target, sizeof (zc.zc_value));
4464 
4465 	zc.zc_cookie = recursive;
4466 
4467 	if ((ret = zfs_ioctl(zhp->zfs_hdl, ZFS_IOC_RENAME, &zc)) != 0) {
4468 		/*
4469 		 * if it was recursive, the one that actually failed will
4470 		 * be in zc.zc_name
4471 		 */
4472 		(void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
4473 		    "cannot rename '%s'"), zc.zc_name);
4474 
4475 		if (recursive && errno == EEXIST) {
4476 			zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
4477 			    "a child dataset already has a snapshot "
4478 			    "with the new name"));
4479 			(void) zfs_error(hdl, EZFS_EXISTS, errbuf);
4480 		} else if (errno == EACCES) {
4481 			zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
4482 			    "cannot move encrypted child outside of "
4483 			    "its encryption root"));
4484 			(void) zfs_error(hdl, EZFS_CRYPTOFAILED, errbuf);
4485 		} else {
4486 			(void) zfs_standard_error(zhp->zfs_hdl, errno, errbuf);
4487 		}
4488 
4489 		/*
4490 		 * On failure, we still want to remount any filesystems that
4491 		 * were previously mounted, so we don't alter the system state.
4492 		 */
4493 		if (cl != NULL)
4494 			(void) changelist_postfix(cl);
4495 	} else {
4496 		if (cl != NULL) {
4497 			changelist_rename(cl, zfs_get_name(zhp), target);
4498 			ret = changelist_postfix(cl);
4499 		}
4500 	}
4501 
4502 error:
4503 	if (parentname != NULL) {
4504 		free(parentname);
4505 	}
4506 	if (zhrp != NULL) {
4507 		zfs_close(zhrp);
4508 	}
4509 	if (cl != NULL) {
4510 		changelist_free(cl);
4511 	}
4512 	return (ret);
4513 }
4514 
4515 nvlist_t *
4516 zfs_get_user_props(zfs_handle_t *zhp)
4517 {
4518 	return (zhp->zfs_user_props);
4519 }
4520 
4521 nvlist_t *
4522 zfs_get_recvd_props(zfs_handle_t *zhp)
4523 {
4524 	if (zhp->zfs_recvd_props == NULL)
4525 		if (get_recvd_props_ioctl(zhp) != 0)
4526 			return (NULL);
4527 	return (zhp->zfs_recvd_props);
4528 }
4529 
4530 /*
4531  * This function is used by 'zfs list' to determine the exact set of columns to
4532  * display, and their maximum widths.  This does two main things:
4533  *
4534  *      - If this is a list of all properties, then expand the list to include
4535  *        all native properties, and set a flag so that for each dataset we look
4536  *        for new unique user properties and add them to the list.
4537  *
4538  *      - For non fixed-width properties, keep track of the maximum width seen
4539  *        so that we can size the column appropriately. If the user has
4540  *        requested received property values, we also need to compute the width
4541  *        of the RECEIVED column.
4542  */
4543 int
4544 zfs_expand_proplist(zfs_handle_t *zhp, zprop_list_t **plp, boolean_t received,
4545     boolean_t literal)
4546 {
4547 	libzfs_handle_t *hdl = zhp->zfs_hdl;
4548 	zprop_list_t *entry;
4549 	zprop_list_t **last, **start;
4550 	nvlist_t *userprops, *propval;
4551 	nvpair_t *elem;
4552 	char *strval;
4553 	char buf[ZFS_MAXPROPLEN];
4554 
4555 	if (zprop_expand_list(hdl, plp, ZFS_TYPE_DATASET) != 0)
4556 		return (-1);
4557 
4558 	userprops = zfs_get_user_props(zhp);
4559 
4560 	entry = *plp;
4561 	if (entry->pl_all && nvlist_next_nvpair(userprops, NULL) != NULL) {
4562 		/*
4563 		 * Go through and add any user properties as necessary.  We
4564 		 * start by incrementing our list pointer to the first
4565 		 * non-native property.
4566 		 */
4567 		start = plp;
4568 		while (*start != NULL) {
4569 			if ((*start)->pl_prop == ZPROP_INVAL)
4570 				break;
4571 			start = &(*start)->pl_next;
4572 		}
4573 
4574 		elem = NULL;
4575 		while ((elem = nvlist_next_nvpair(userprops, elem)) != NULL) {
4576 			/*
4577 			 * See if we've already found this property in our list.
4578 			 */
4579 			for (last = start; *last != NULL;
4580 			    last = &(*last)->pl_next) {
4581 				if (strcmp((*last)->pl_user_prop,
4582 				    nvpair_name(elem)) == 0)
4583 					break;
4584 			}
4585 
4586 			if (*last == NULL) {
4587 				if ((entry = zfs_alloc(hdl,
4588 				    sizeof (zprop_list_t))) == NULL ||
4589 				    ((entry->pl_user_prop = zfs_strdup(hdl,
4590 				    nvpair_name(elem)))) == NULL) {
4591 					free(entry);
4592 					return (-1);
4593 				}
4594 
4595 				entry->pl_prop = ZPROP_INVAL;
4596 				entry->pl_width = strlen(nvpair_name(elem));
4597 				entry->pl_all = B_TRUE;
4598 				*last = entry;
4599 			}
4600 		}
4601 	}
4602 
4603 	/*
4604 	 * Now go through and check the width of any non-fixed columns
4605 	 */
4606 	for (entry = *plp; entry != NULL; entry = entry->pl_next) {
4607 		if (entry->pl_fixed && !literal)
4608 			continue;
4609 
4610 		if (entry->pl_prop != ZPROP_INVAL) {
4611 			if (zfs_prop_get(zhp, entry->pl_prop,
4612 			    buf, sizeof (buf), NULL, NULL, 0, literal) == 0) {
4613 				if (strlen(buf) > entry->pl_width)
4614 					entry->pl_width = strlen(buf);
4615 			}
4616 			if (received && zfs_prop_get_recvd(zhp,
4617 			    zfs_prop_to_name(entry->pl_prop),
4618 			    buf, sizeof (buf), literal) == 0)
4619 				if (strlen(buf) > entry->pl_recvd_width)
4620 					entry->pl_recvd_width = strlen(buf);
4621 		} else {
4622 			if (nvlist_lookup_nvlist(userprops, entry->pl_user_prop,
4623 			    &propval) == 0) {
4624 				verify(nvlist_lookup_string(propval,
4625 				    ZPROP_VALUE, &strval) == 0);
4626 				if (strlen(strval) > entry->pl_width)
4627 					entry->pl_width = strlen(strval);
4628 			}
4629 			if (received && zfs_prop_get_recvd(zhp,
4630 			    entry->pl_user_prop,
4631 			    buf, sizeof (buf), literal) == 0)
4632 				if (strlen(buf) > entry->pl_recvd_width)
4633 					entry->pl_recvd_width = strlen(buf);
4634 		}
4635 	}
4636 
4637 	return (0);
4638 }
4639 
4640 int
4641 zfs_deleg_share_nfs(libzfs_handle_t *hdl, char *dataset, char *path,
4642     char *resource, void *export, void *sharetab,
4643     int sharemax, zfs_share_op_t operation)
4644 {
4645 	zfs_cmd_t zc = { 0 };
4646 	int error;
4647 
4648 	(void) strlcpy(zc.zc_name, dataset, sizeof (zc.zc_name));
4649 	(void) strlcpy(zc.zc_value, path, sizeof (zc.zc_value));
4650 	if (resource)
4651 		(void) strlcpy(zc.zc_string, resource, sizeof (zc.zc_string));
4652 	zc.zc_share.z_sharedata = (uint64_t)(uintptr_t)sharetab;
4653 	zc.zc_share.z_exportdata = (uint64_t)(uintptr_t)export;
4654 	zc.zc_share.z_sharetype = operation;
4655 	zc.zc_share.z_sharemax = sharemax;
4656 	error = ioctl(hdl->libzfs_fd, ZFS_IOC_SHARE, &zc);
4657 	return (error);
4658 }
4659 
4660 void
4661 zfs_prune_proplist(zfs_handle_t *zhp, uint8_t *props)
4662 {
4663 	nvpair_t *curr;
4664 
4665 	/*
4666 	 * Keep a reference to the props-table against which we prune the
4667 	 * properties.
4668 	 */
4669 	zhp->zfs_props_table = props;
4670 
4671 	curr = nvlist_next_nvpair(zhp->zfs_props, NULL);
4672 
4673 	while (curr) {
4674 		zfs_prop_t zfs_prop = zfs_name_to_prop(nvpair_name(curr));
4675 		nvpair_t *next = nvlist_next_nvpair(zhp->zfs_props, curr);
4676 
4677 		/*
4678 		 * User properties will result in ZPROP_INVAL, and since we
4679 		 * only know how to prune standard ZFS properties, we always
4680 		 * leave these in the list.  This can also happen if we
4681 		 * encounter an unknown DSL property (when running older
4682 		 * software, for example).
4683 		 */
4684 		if (zfs_prop != ZPROP_INVAL && props[zfs_prop] == B_FALSE)
4685 			(void) nvlist_remove(zhp->zfs_props,
4686 			    nvpair_name(curr), nvpair_type(curr));
4687 		curr = next;
4688 	}
4689 }
4690 
4691 static int
4692 zfs_smb_acl_mgmt(libzfs_handle_t *hdl, char *dataset, char *path,
4693     zfs_smb_acl_op_t cmd, char *resource1, char *resource2)
4694 {
4695 	zfs_cmd_t zc = { 0 };
4696 	nvlist_t *nvlist = NULL;
4697 	int error;
4698 
4699 	(void) strlcpy(zc.zc_name, dataset, sizeof (zc.zc_name));
4700 	(void) strlcpy(zc.zc_value, path, sizeof (zc.zc_value));
4701 	zc.zc_cookie = (uint64_t)cmd;
4702 
4703 	if (cmd == ZFS_SMB_ACL_RENAME) {
4704 		if (nvlist_alloc(&nvlist, NV_UNIQUE_NAME, 0) != 0) {
4705 			(void) no_memory(hdl);
4706 			return (0);
4707 		}
4708 	}
4709 
4710 	switch (cmd) {
4711 	case ZFS_SMB_ACL_ADD:
4712 	case ZFS_SMB_ACL_REMOVE:
4713 		(void) strlcpy(zc.zc_string, resource1, sizeof (zc.zc_string));
4714 		break;
4715 	case ZFS_SMB_ACL_RENAME:
4716 		if (nvlist_add_string(nvlist, ZFS_SMB_ACL_SRC,
4717 		    resource1) != 0) {
4718 				(void) no_memory(hdl);
4719 				return (-1);
4720 		}
4721 		if (nvlist_add_string(nvlist, ZFS_SMB_ACL_TARGET,
4722 		    resource2) != 0) {
4723 				(void) no_memory(hdl);
4724 				return (-1);
4725 		}
4726 		if (zcmd_write_src_nvlist(hdl, &zc, nvlist) != 0) {
4727 			nvlist_free(nvlist);
4728 			return (-1);
4729 		}
4730 		break;
4731 	case ZFS_SMB_ACL_PURGE:
4732 		break;
4733 	default:
4734 		return (-1);
4735 	}
4736 	error = ioctl(hdl->libzfs_fd, ZFS_IOC_SMB_ACL, &zc);
4737 	nvlist_free(nvlist);
4738 	return (error);
4739 }
4740 
4741 int
4742 zfs_smb_acl_add(libzfs_handle_t *hdl, char *dataset,
4743     char *path, char *resource)
4744 {
4745 	return (zfs_smb_acl_mgmt(hdl, dataset, path, ZFS_SMB_ACL_ADD,
4746 	    resource, NULL));
4747 }
4748 
4749 int
4750 zfs_smb_acl_remove(libzfs_handle_t *hdl, char *dataset,
4751     char *path, char *resource)
4752 {
4753 	return (zfs_smb_acl_mgmt(hdl, dataset, path, ZFS_SMB_ACL_REMOVE,
4754 	    resource, NULL));
4755 }
4756 
4757 int
4758 zfs_smb_acl_purge(libzfs_handle_t *hdl, char *dataset, char *path)
4759 {
4760 	return (zfs_smb_acl_mgmt(hdl, dataset, path, ZFS_SMB_ACL_PURGE,
4761 	    NULL, NULL));
4762 }
4763 
4764 int
4765 zfs_smb_acl_rename(libzfs_handle_t *hdl, char *dataset, char *path,
4766     char *oldname, char *newname)
4767 {
4768 	return (zfs_smb_acl_mgmt(hdl, dataset, path, ZFS_SMB_ACL_RENAME,
4769 	    oldname, newname));
4770 }
4771 
4772 int
4773 zfs_userspace(zfs_handle_t *zhp, zfs_userquota_prop_t type,
4774     zfs_userspace_cb_t func, void *arg)
4775 {
4776 	zfs_cmd_t zc = { 0 };
4777 	zfs_useracct_t buf[100];
4778 	libzfs_handle_t *hdl = zhp->zfs_hdl;
4779 	int ret;
4780 
4781 	(void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));
4782 
4783 	zc.zc_objset_type = type;
4784 	zc.zc_nvlist_dst = (uintptr_t)buf;
4785 
4786 	for (;;) {
4787 		zfs_useracct_t *zua = buf;
4788 
4789 		zc.zc_nvlist_dst_size = sizeof (buf);
4790 		if (zfs_ioctl(hdl, ZFS_IOC_USERSPACE_MANY, &zc) != 0) {
4791 			char errbuf[1024];
4792 
4793 			if ((errno == ENOTSUP &&
4794 			    (type == ZFS_PROP_USEROBJUSED ||
4795 			    type == ZFS_PROP_GROUPOBJUSED ||
4796 			    type == ZFS_PROP_USEROBJQUOTA ||
4797 			    type == ZFS_PROP_GROUPOBJQUOTA ||
4798 			    type == ZFS_PROP_PROJECTOBJUSED ||
4799 			    type == ZFS_PROP_PROJECTOBJQUOTA ||
4800 			    type == ZFS_PROP_PROJECTUSED ||
4801 			    type == ZFS_PROP_PROJECTQUOTA)))
4802 				break;
4803 
4804 			(void) snprintf(errbuf, sizeof (errbuf),
4805 			    dgettext(TEXT_DOMAIN,
4806 			    "cannot get used/quota for %s"), zc.zc_name);
4807 			return (zfs_standard_error_fmt(hdl, errno, errbuf));
4808 		}
4809 		if (zc.zc_nvlist_dst_size == 0)
4810 			break;
4811 
4812 		while (zc.zc_nvlist_dst_size > 0) {
4813 			if ((ret = func(arg, zua->zu_domain, zua->zu_rid,
4814 			    zua->zu_space)) != 0)
4815 				return (ret);
4816 			zua++;
4817 			zc.zc_nvlist_dst_size -= sizeof (zfs_useracct_t);
4818 		}
4819 	}
4820 
4821 	return (0);
4822 }
4823 
4824 struct holdarg {
4825 	nvlist_t *nvl;
4826 	const char *snapname;
4827 	const char *tag;
4828 	boolean_t recursive;
4829 	int error;
4830 };
4831 
4832 static int
4833 zfs_hold_one(zfs_handle_t *zhp, void *arg)
4834 {
4835 	struct holdarg *ha = arg;
4836 	char name[ZFS_MAX_DATASET_NAME_LEN];
4837 	int rv = 0;
4838 
4839 	(void) snprintf(name, sizeof (name),
4840 	    "%s@%s", zhp->zfs_name, ha->snapname);
4841 
4842 	if (lzc_exists(name))
4843 		fnvlist_add_string(ha->nvl, name, ha->tag);
4844 
4845 	if (ha->recursive)
4846 		rv = zfs_iter_filesystems(zhp, zfs_hold_one, ha);
4847 	zfs_close(zhp);
4848 	return (rv);
4849 }
4850 
4851 int
4852 zfs_hold(zfs_handle_t *zhp, const char *snapname, const char *tag,
4853     boolean_t recursive, int cleanup_fd)
4854 {
4855 	int ret;
4856 	struct holdarg ha;
4857 
4858 	ha.nvl = fnvlist_alloc();
4859 	ha.snapname = snapname;
4860 	ha.tag = tag;
4861 	ha.recursive = recursive;
4862 	(void) zfs_hold_one(zfs_handle_dup(zhp), &ha);
4863 
4864 	if (nvlist_empty(ha.nvl)) {
4865 		char errbuf[1024];
4866 
4867 		fnvlist_free(ha.nvl);
4868 		ret = ENOENT;
4869 		(void) snprintf(errbuf, sizeof (errbuf),
4870 		    dgettext(TEXT_DOMAIN,
4871 		    "cannot hold snapshot '%s@%s'"),
4872 		    zhp->zfs_name, snapname);
4873 		(void) zfs_standard_error(zhp->zfs_hdl, ret, errbuf);
4874 		return (ret);
4875 	}
4876 
4877 	ret = zfs_hold_nvl(zhp, cleanup_fd, ha.nvl);
4878 	fnvlist_free(ha.nvl);
4879 
4880 	return (ret);
4881 }
4882 
4883 int
4884 zfs_hold_nvl(zfs_handle_t *zhp, int cleanup_fd, nvlist_t *holds)
4885 {
4886 	int ret;
4887 	nvlist_t *errors;
4888 	libzfs_handle_t *hdl = zhp->zfs_hdl;
4889 	char errbuf[1024];
4890 	nvpair_t *elem;
4891 
4892 	errors = NULL;
4893 	ret = lzc_hold(holds, cleanup_fd, &errors);
4894 
4895 	if (ret == 0) {
4896 		/* There may be errors even in the success case. */
4897 		fnvlist_free(errors);
4898 		return (0);
4899 	}
4900 
4901 	if (nvlist_empty(errors)) {
4902 		/* no hold-specific errors */
4903 		(void) snprintf(errbuf, sizeof (errbuf),
4904 		    dgettext(TEXT_DOMAIN, "cannot hold"));
4905 		switch (ret) {
4906 		case ENOTSUP:
4907 			zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
4908 			    "pool must be upgraded"));
4909 			(void) zfs_error(hdl, EZFS_BADVERSION, errbuf);
4910 			break;
4911 		case EINVAL:
4912 			(void) zfs_error(hdl, EZFS_BADTYPE, errbuf);
4913 			break;
4914 		default:
4915 			(void) zfs_standard_error(hdl, ret, errbuf);
4916 		}
4917 	}
4918 
4919 	for (elem = nvlist_next_nvpair(errors, NULL);
4920 	    elem != NULL;
4921 	    elem = nvlist_next_nvpair(errors, elem)) {
4922 		(void) snprintf(errbuf, sizeof (errbuf),
4923 		    dgettext(TEXT_DOMAIN,
4924 		    "cannot hold snapshot '%s'"), nvpair_name(elem));
4925 		switch (fnvpair_value_int32(elem)) {
4926 		case E2BIG:
4927 			/*
4928 			 * Temporary tags wind up having the ds object id
4929 			 * prepended. So even if we passed the length check
4930 			 * above, it's still possible for the tag to wind
4931 			 * up being slightly too long.
4932 			 */
4933 			(void) zfs_error(hdl, EZFS_TAGTOOLONG, errbuf);
4934 			break;
4935 		case EINVAL:
4936 			(void) zfs_error(hdl, EZFS_BADTYPE, errbuf);
4937 			break;
4938 		case EEXIST:
4939 			(void) zfs_error(hdl, EZFS_REFTAG_HOLD, errbuf);
4940 			break;
4941 		default:
4942 			(void) zfs_standard_error(hdl,
4943 			    fnvpair_value_int32(elem), errbuf);
4944 		}
4945 	}
4946 
4947 	fnvlist_free(errors);
4948 	return (ret);
4949 }
4950 
4951 static int
4952 zfs_release_one(zfs_handle_t *zhp, void *arg)
4953 {
4954 	struct holdarg *ha = arg;
4955 	char name[ZFS_MAX_DATASET_NAME_LEN];
4956 	int rv = 0;
4957 	nvlist_t *existing_holds;
4958 
4959 	(void) snprintf(name, sizeof (name),
4960 	    "%s@%s", zhp->zfs_name, ha->snapname);
4961 
4962 	if (lzc_get_holds(name, &existing_holds) != 0) {
4963 		ha->error = ENOENT;
4964 	} else if (!nvlist_exists(existing_holds, ha->tag)) {
4965 		ha->error = ESRCH;
4966 	} else {
4967 		nvlist_t *torelease = fnvlist_alloc();
4968 		fnvlist_add_boolean(torelease, ha->tag);
4969 		fnvlist_add_nvlist(ha->nvl, name, torelease);
4970 		fnvlist_free(torelease);
4971 	}
4972 
4973 	if (ha->recursive)
4974 		rv = zfs_iter_filesystems(zhp, zfs_release_one, ha);
4975 	zfs_close(zhp);
4976 	return (rv);
4977 }
4978 
4979 int
4980 zfs_release(zfs_handle_t *zhp, const char *snapname, const char *tag,
4981     boolean_t recursive)
4982 {
4983 	int ret;
4984 	struct holdarg ha;
4985 	nvlist_t *errors = NULL;
4986 	nvpair_t *elem;
4987 	libzfs_handle_t *hdl = zhp->zfs_hdl;
4988 	char errbuf[1024];
4989 
4990 	ha.nvl = fnvlist_alloc();
4991 	ha.snapname = snapname;
4992 	ha.tag = tag;
4993 	ha.recursive = recursive;
4994 	ha.error = 0;
4995 	(void) zfs_release_one(zfs_handle_dup(zhp), &ha);
4996 
4997 	if (nvlist_empty(ha.nvl)) {
4998 		fnvlist_free(ha.nvl);
4999 		ret = ha.error;
5000 		(void) snprintf(errbuf, sizeof (errbuf),
5001 		    dgettext(TEXT_DOMAIN,
5002 		    "cannot release hold from snapshot '%s@%s'"),
5003 		    zhp->zfs_name, snapname);
5004 		if (ret == ESRCH) {
5005 			(void) zfs_error(hdl, EZFS_REFTAG_RELE, errbuf);
5006 		} else {
5007 			(void) zfs_standard_error(hdl, ret, errbuf);
5008 		}
5009 		return (ret);
5010 	}
5011 
5012 	ret = lzc_release(ha.nvl, &errors);
5013 	fnvlist_free(ha.nvl);
5014 
5015 	if (ret == 0) {
5016 		/* There may be errors even in the success case. */
5017 		fnvlist_free(errors);
5018 		return (0);
5019 	}
5020 
5021 	if (nvlist_empty(errors)) {
5022 		/* no hold-specific errors */
5023 		(void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
5024 		    "cannot release"));
5025 		switch (errno) {
5026 		case ENOTSUP:
5027 			zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
5028 			    "pool must be upgraded"));
5029 			(void) zfs_error(hdl, EZFS_BADVERSION, errbuf);
5030 			break;
5031 		default:
5032 			(void) zfs_standard_error_fmt(hdl, errno, errbuf);
5033 		}
5034 	}
5035 
5036 	for (elem = nvlist_next_nvpair(errors, NULL);
5037 	    elem != NULL;
5038 	    elem = nvlist_next_nvpair(errors, elem)) {
5039 		(void) snprintf(errbuf, sizeof (errbuf),
5040 		    dgettext(TEXT_DOMAIN,
5041 		    "cannot release hold from snapshot '%s'"),
5042 		    nvpair_name(elem));
5043 		switch (fnvpair_value_int32(elem)) {
5044 		case ESRCH:
5045 			(void) zfs_error(hdl, EZFS_REFTAG_RELE, errbuf);
5046 			break;
5047 		case EINVAL:
5048 			(void) zfs_error(hdl, EZFS_BADTYPE, errbuf);
5049 			break;
5050 		default:
5051 			(void) zfs_standard_error_fmt(hdl,
5052 			    fnvpair_value_int32(elem), errbuf);
5053 		}
5054 	}
5055 
5056 	fnvlist_free(errors);
5057 	return (ret);
5058 }
5059 
5060 int
5061 zfs_get_fsacl(zfs_handle_t *zhp, nvlist_t **nvl)
5062 {
5063 	zfs_cmd_t zc = { 0 };
5064 	libzfs_handle_t *hdl = zhp->zfs_hdl;
5065 	int nvsz = 2048;
5066 	void *nvbuf;
5067 	int err = 0;
5068 	char errbuf[1024];
5069 
5070 	assert(zhp->zfs_type == ZFS_TYPE_VOLUME ||
5071 	    zhp->zfs_type == ZFS_TYPE_FILESYSTEM);
5072 
5073 tryagain:
5074 
5075 	nvbuf = malloc(nvsz);
5076 	if (nvbuf == NULL) {
5077 		err = (zfs_error(hdl, EZFS_NOMEM, strerror(errno)));
5078 		goto out;
5079 	}
5080 
5081 	zc.zc_nvlist_dst_size = nvsz;
5082 	zc.zc_nvlist_dst = (uintptr_t)nvbuf;
5083 
5084 	(void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));
5085 
5086 	if (ioctl(hdl->libzfs_fd, ZFS_IOC_GET_FSACL, &zc) != 0) {
5087 		(void) snprintf(errbuf, sizeof (errbuf),
5088 		    dgettext(TEXT_DOMAIN, "cannot get permissions on '%s'"),
5089 		    zc.zc_name);
5090 		switch (errno) {
5091 		case ENOMEM:
5092 			free(nvbuf);
5093 			nvsz = zc.zc_nvlist_dst_size;
5094 			goto tryagain;
5095 
5096 		case ENOTSUP:
5097 			zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
5098 			    "pool must be upgraded"));
5099 			err = zfs_error(hdl, EZFS_BADVERSION, errbuf);
5100 			break;
5101 		case EINVAL:
5102 			err = zfs_error(hdl, EZFS_BADTYPE, errbuf);
5103 			break;
5104 		case ENOENT:
5105 			err = zfs_error(hdl, EZFS_NOENT, errbuf);
5106 			break;
5107 		default:
5108 			err = zfs_standard_error_fmt(hdl, errno, errbuf);
5109 			break;
5110 		}
5111 	} else {
5112 		/* success */
5113 		int rc = nvlist_unpack(nvbuf, zc.zc_nvlist_dst_size, nvl, 0);
5114 		if (rc) {
5115 			(void) snprintf(errbuf, sizeof (errbuf), dgettext(
5116 			    TEXT_DOMAIN, "cannot get permissions on '%s'"),
5117 			    zc.zc_name);
5118 			err = zfs_standard_error_fmt(hdl, rc, errbuf);
5119 		}
5120 	}
5121 
5122 	free(nvbuf);
5123 out:
5124 	return (err);
5125 }
5126 
5127 int
5128 zfs_set_fsacl(zfs_handle_t *zhp, boolean_t un, nvlist_t *nvl)
5129 {
5130 	zfs_cmd_t zc = { 0 };
5131 	libzfs_handle_t *hdl = zhp->zfs_hdl;
5132 	char *nvbuf;
5133 	char errbuf[1024];
5134 	size_t nvsz;
5135 	int err;
5136 
5137 	assert(zhp->zfs_type == ZFS_TYPE_VOLUME ||
5138 	    zhp->zfs_type == ZFS_TYPE_FILESYSTEM);
5139 
5140 	err = nvlist_size(nvl, &nvsz, NV_ENCODE_NATIVE);
5141 	assert(err == 0);
5142 
5143 	nvbuf = malloc(nvsz);
5144 
5145 	err = nvlist_pack(nvl, &nvbuf, &nvsz, NV_ENCODE_NATIVE, 0);
5146 	assert(err == 0);
5147 
5148 	zc.zc_nvlist_src_size = nvsz;
5149 	zc.zc_nvlist_src = (uintptr_t)nvbuf;
5150 	zc.zc_perm_action = un;
5151 
5152 	(void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));
5153 
5154 	if (zfs_ioctl(hdl, ZFS_IOC_SET_FSACL, &zc) != 0) {
5155 		(void) snprintf(errbuf, sizeof (errbuf),
5156 		    dgettext(TEXT_DOMAIN, "cannot set permissions on '%s'"),
5157 		    zc.zc_name);
5158 		switch (errno) {
5159 		case ENOTSUP:
5160 			zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
5161 			    "pool must be upgraded"));
5162 			err = zfs_error(hdl, EZFS_BADVERSION, errbuf);
5163 			break;
5164 		case EINVAL:
5165 			err = zfs_error(hdl, EZFS_BADTYPE, errbuf);
5166 			break;
5167 		case ENOENT:
5168 			err = zfs_error(hdl, EZFS_NOENT, errbuf);
5169 			break;
5170 		default:
5171 			err = zfs_standard_error_fmt(hdl, errno, errbuf);
5172 			break;
5173 		}
5174 	}
5175 
5176 	free(nvbuf);
5177 
5178 	return (err);
5179 }
5180 
5181 int
5182 zfs_get_holds(zfs_handle_t *zhp, nvlist_t **nvl)
5183 {
5184 	int err;
5185 	char errbuf[1024];
5186 
5187 	err = lzc_get_holds(zhp->zfs_name, nvl);
5188 
5189 	if (err != 0) {
5190 		libzfs_handle_t *hdl = zhp->zfs_hdl;
5191 
5192 		(void) snprintf(errbuf, sizeof (errbuf),
5193 		    dgettext(TEXT_DOMAIN, "cannot get holds for '%s'"),
5194 		    zhp->zfs_name);
5195 		switch (err) {
5196 		case ENOTSUP:
5197 			zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
5198 			    "pool must be upgraded"));
5199 			err = zfs_error(hdl, EZFS_BADVERSION, errbuf);
5200 			break;
5201 		case EINVAL:
5202 			err = zfs_error(hdl, EZFS_BADTYPE, errbuf);
5203 			break;
5204 		case ENOENT:
5205 			err = zfs_error(hdl, EZFS_NOENT, errbuf);
5206 			break;
5207 		default:
5208 			err = zfs_standard_error_fmt(hdl, errno, errbuf);
5209 			break;
5210 		}
5211 	}
5212 
5213 	return (err);
5214 }
5215 
5216 /*
5217  * The theory of raidz space accounting
5218  *
5219  * The "referenced" property of RAIDZ vdevs is scaled such that a 128KB block
5220  * will "reference" 128KB, even though it allocates more than that, to store the
5221  * parity information (and perhaps skip sectors). This concept of the
5222  * "referenced" (and other DMU space accounting) being lower than the allocated
5223  * space by a constant factor is called "raidz deflation."
5224  *
5225  * As mentioned above, the constant factor for raidz deflation assumes a 128KB
5226  * block size. However, zvols typically have a much smaller block size (default
5227  * 8KB). These smaller blocks may require proportionally much more parity
5228  * information (and perhaps skip sectors). In this case, the change to the
5229  * "referenced" property may be much more than the logical block size.
5230  *
5231  * Suppose a raidz vdev has 5 disks with ashift=12.  A 128k block may be written
5232  * as follows.
5233  *
5234  * +-------+-------+-------+-------+-------+
5235  * | disk1 | disk2 | disk3 | disk4 | disk5 |
5236  * +-------+-------+-------+-------+-------+
5237  * |  P0   |  D0   |  D8   |  D16  |  D24  |
5238  * |  P1   |  D1   |  D9   |  D17  |  D25  |
5239  * |  P2   |  D2   |  D10  |  D18  |  D26  |
5240  * |  P3   |  D3   |  D11  |  D19  |  D27  |
5241  * |  P4   |  D4   |  D12  |  D20  |  D28  |
5242  * |  P5   |  D5   |  D13  |  D21  |  D29  |
5243  * |  P6   |  D6   |  D14  |  D22  |  D30  |
5244  * |  P7   |  D7   |  D15  |  D23  |  D31  |
5245  * +-------+-------+-------+-------+-------+
5246  *
5247  * Above, notice that 160k was allocated: 8 x 4k parity sectors + 32 x 4k data
5248  * sectors.  The dataset's referenced will increase by 128k and the pool's
5249  * allocated and free properties will be adjusted by 160k.
5250  *
5251  * A 4k block written to the same raidz vdev will require two 4k sectors.  The
5252  * blank cells represent unallocated space.
5253  *
5254  * +-------+-------+-------+-------+-------+
5255  * | disk1 | disk2 | disk3 | disk4 | disk5 |
5256  * +-------+-------+-------+-------+-------+
5257  * |  P0   |  D0   |       |       |       |
5258  * +-------+-------+-------+-------+-------+
5259  *
5260  * Above, notice that the 4k block required one sector for parity and another
5261  * for data.  vdev_raidz_asize() will return 8k and as such the pool's allocated
5262  * and free properties will be adjusted by 8k.  The dataset will not be charged
5263  * 8k.  Rather, it will be charged a value that is scaled according to the
5264  * overhead of the 128k block on the same vdev.  This 8k allocation will be
5265  * charged 8k * 128k / 160k.  128k is from SPA_OLD_MAXBLOCKSIZE and 160k is as
5266  * calculated in the 128k block example above.
5267  *
5268  * Every raidz allocation is sized to be a multiple of nparity+1 sectors.  That
5269  * is, every raidz1 allocation will be a multiple of 2 sectors, raidz2
5270  * allocations are a multiple of 3 sectors, and raidz3 allocations are a
5271  * multiple of of 4 sectors.  When a block does not fill the required number of
5272  * sectors, skip blocks (sectors) are used.
5273  *
5274  * An 8k block being written to a raidz vdev may be written as follows:
5275  *
5276  * +-------+-------+-------+-------+-------+
5277  * | disk1 | disk2 | disk3 | disk4 | disk5 |
5278  * +-------+-------+-------+-------+-------+
5279  * |  P0   |  D0   |  D1   |  S0   |       |
5280  * +-------+-------+-------+-------+-------+
5281  *
5282  * In order to maintain the nparity+1 allocation size, a skip block (S0) was
5283  * added.  For this 8k block, the pool's allocated and free properties are
5284  * adjusted by 16k and the dataset's referenced is increased by 16k * 128k /
5285  * 160k.  Again, 128k is from SPA_OLD_MAXBLOCKSIZE and 160k is as calculated in
5286  * the 128k block example above.
5287  *
5288  * Compression may lead to a variety of block sizes being written for the same
5289  * volume or file.  There is no clear way to reserve just the amount of space
5290  * that will be required, so the worst case (no compression) is assumed.
5291  * Note that metadata blocks will typically be compressed, so the reservation
5292  * size returned by zvol_volsize_to_reservation() will generally be slightly
5293  * larger than the maximum that the volume can reference.
5294  */
5295 
5296 /*
5297  * Derived from function of same name in uts/common/fs/zfs/vdev_raidz.c.
5298  * Returns the amount of space (in bytes) that will be allocated for the
5299  * specified block size. Note that the "referenced" space accounted will be less
5300  * than this, but not necessarily equal to "blksize", due to RAIDZ deflation.
5301  */
5302 static uint64_t
5303 vdev_raidz_asize(uint64_t ndisks, uint64_t nparity, uint64_t ashift,
5304     uint64_t blksize)
5305 {
5306 	uint64_t asize, ndata;
5307 
5308 	ASSERT3U(ndisks, >, nparity);
5309 	ndata = ndisks - nparity;
5310 	asize = ((blksize - 1) >> ashift) + 1;
5311 	asize += nparity * ((asize + ndata - 1) / ndata);
5312 	asize = roundup(asize, nparity + 1) << ashift;
5313 
5314 	return (asize);
5315 }
5316 
5317 /*
5318  * Determine how much space will be allocated if it lands on the most space-
5319  * inefficient top-level vdev.  Returns the size in bytes required to store one
5320  * copy of the volume data.  See theory comment above.
5321  */
5322 static uint64_t
5323 volsize_from_vdevs(zpool_handle_t *zhp, uint64_t nblocks, uint64_t blksize)
5324 {
5325 	nvlist_t *config, *tree, **vdevs;
5326 	uint_t nvdevs, v;
5327 	uint64_t ret = 0;
5328 
5329 	config = zpool_get_config(zhp, NULL);
5330 	if (nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, &tree) != 0 ||
5331 	    nvlist_lookup_nvlist_array(tree, ZPOOL_CONFIG_CHILDREN,
5332 	    &vdevs, &nvdevs) != 0) {
5333 		return (nblocks * blksize);
5334 	}
5335 
5336 	for (v = 0; v < nvdevs; v++) {
5337 		char *type;
5338 		uint64_t nparity, ashift, asize, tsize;
5339 		nvlist_t **disks;
5340 		uint_t ndisks;
5341 		uint64_t volsize;
5342 
5343 		if (nvlist_lookup_string(vdevs[v], ZPOOL_CONFIG_TYPE,
5344 		    &type) != 0 || strcmp(type, VDEV_TYPE_RAIDZ) != 0 ||
5345 		    nvlist_lookup_uint64(vdevs[v], ZPOOL_CONFIG_NPARITY,
5346 		    &nparity) != 0 ||
5347 		    nvlist_lookup_uint64(vdevs[v], ZPOOL_CONFIG_ASHIFT,
5348 		    &ashift) != 0 ||
5349 		    nvlist_lookup_nvlist_array(vdevs[v], ZPOOL_CONFIG_CHILDREN,
5350 		    &disks, &ndisks) != 0) {
5351 			continue;
5352 		}
5353 
5354 		/* allocation size for the "typical" 128k block */
5355 		tsize = vdev_raidz_asize(ndisks, nparity, ashift,
5356 		    SPA_OLD_MAXBLOCKSIZE);
5357 		/* allocation size for the blksize block */
5358 		asize = vdev_raidz_asize(ndisks, nparity, ashift, blksize);
5359 
5360 		/*
5361 		 * Scale this size down as a ratio of 128k / tsize.  See theory
5362 		 * statement above.
5363 		 */
5364 		volsize = nblocks * asize * SPA_OLD_MAXBLOCKSIZE / tsize;
5365 		if (volsize > ret) {
5366 			ret = volsize;
5367 		}
5368 	}
5369 
5370 	if (ret == 0) {
5371 		ret = nblocks * blksize;
5372 	}
5373 
5374 	return (ret);
5375 }
5376 
5377 /*
5378  * Convert the zvol's volume size to an appropriate reservation.  See theory
5379  * comment above.
5380  *
5381  * Note: If this routine is updated, it is necessary to update the ZFS test
5382  * suite's shell version in reservation.shlib.
5383  */
5384 uint64_t
5385 zvol_volsize_to_reservation(zpool_handle_t *zph, uint64_t volsize,
5386     nvlist_t *props)
5387 {
5388 	uint64_t numdb;
5389 	uint64_t nblocks, volblocksize;
5390 	int ncopies;
5391 	char *strval;
5392 
5393 	if (nvlist_lookup_string(props,
5394 	    zfs_prop_to_name(ZFS_PROP_COPIES), &strval) == 0)
5395 		ncopies = atoi(strval);
5396 	else
5397 		ncopies = 1;
5398 	if (nvlist_lookup_uint64(props,
5399 	    zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE),
5400 	    &volblocksize) != 0)
5401 		volblocksize = ZVOL_DEFAULT_BLOCKSIZE;
5402 
5403 	nblocks = volsize / volblocksize;
5404 	/*
5405 	 * Metadata defaults to using 128k blocks, not volblocksize blocks.  For
5406 	 * this reason, only the data blocks are scaled based on vdev config.
5407 	 */
5408 	volsize = volsize_from_vdevs(zph, nblocks, volblocksize);
5409 
5410 	/* start with metadnode L0-L6 */
5411 	numdb = 7;
5412 	/* calculate number of indirects */
5413 	while (nblocks > 1) {
5414 		nblocks += DNODES_PER_LEVEL - 1;
5415 		nblocks /= DNODES_PER_LEVEL;
5416 		numdb += nblocks;
5417 	}
5418 	numdb *= MIN(SPA_DVAS_PER_BP, ncopies + 1);
5419 	volsize *= ncopies;
5420 	/*
5421 	 * this is exactly DN_MAX_INDBLKSHIFT when metadata isn't
5422 	 * compressed, but in practice they compress down to about
5423 	 * 1100 bytes
5424 	 */
5425 	numdb *= 1ULL << DN_MAX_INDBLKSHIFT;
5426 	volsize += numdb;
5427 	return (volsize);
5428 }
5429