xref: /freebsd/sys/contrib/openzfs/module/zcommon/zfeature_common.c (revision ee12faa062c04a49bf6fe4e6867bad8606e2413f)
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 https://opensource.org/licenses/CDDL-1.0.
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) 2011, 2018 by Delphix. All rights reserved.
24  * Copyright (c) 2013 by Saso Kiselkov. All rights reserved.
25  * Copyright (c) 2013, Joyent, Inc. All rights reserved.
26  * Copyright (c) 2014, Nexenta Systems, Inc. All rights reserved.
27  * Copyright (c) 2017, Intel Corporation.
28  * Copyright (c) 2019, Klara Inc.
29  * Copyright (c) 2019, Allan Jude
30  */
31 
32 #ifndef _KERNEL
33 #include <errno.h>
34 #include <string.h>
35 #include <dirent.h>
36 #include <search.h>
37 #include <sys/stat.h>
38 #endif
39 #include <sys/debug.h>
40 #include <sys/fs/zfs.h>
41 #include <sys/inttypes.h>
42 #include <sys/types.h>
43 #include <sys/param.h>
44 #include <sys/zfs_sysfs.h>
45 #include "zfeature_common.h"
46 
47 /*
48  * Set to disable all feature checks while opening pools, allowing pools with
49  * unsupported features to be opened. Set for testing only.
50  */
51 boolean_t zfeature_checks_disable = B_FALSE;
52 
53 zfeature_info_t spa_feature_table[SPA_FEATURES];
54 
55 /*
56  * Valid characters for feature guids. This list is mainly for aesthetic
57  * purposes and could be expanded in the future. There are different allowed
58  * characters in the guids reverse dns portion (before the colon) and its
59  * short name (after the colon).
60  */
61 static int
62 valid_char(char c, boolean_t after_colon)
63 {
64 	return ((c >= 'a' && c <= 'z') ||
65 	    (c >= '0' && c <= '9') ||
66 	    (after_colon && c == '_') ||
67 	    (!after_colon && (c == '.' || c == '-')));
68 }
69 
70 /*
71  * Every feature guid must contain exactly one colon which separates a reverse
72  * dns organization name from the feature's "short" name (e.g.
73  * "com.company:feature_name").
74  */
75 boolean_t
76 zfeature_is_valid_guid(const char *name)
77 {
78 	int i;
79 	boolean_t has_colon = B_FALSE;
80 
81 	i = 0;
82 	while (name[i] != '\0') {
83 		char c = name[i++];
84 		if (c == ':') {
85 			if (has_colon)
86 				return (B_FALSE);
87 			has_colon = B_TRUE;
88 			continue;
89 		}
90 		if (!valid_char(c, has_colon))
91 			return (B_FALSE);
92 	}
93 
94 	return (has_colon);
95 }
96 
97 boolean_t
98 zfeature_is_supported(const char *guid)
99 {
100 	if (zfeature_checks_disable)
101 		return (B_TRUE);
102 
103 	for (spa_feature_t i = 0; i < SPA_FEATURES; i++) {
104 		zfeature_info_t *feature = &spa_feature_table[i];
105 		if (!feature->fi_zfs_mod_supported)
106 			continue;
107 		if (strcmp(guid, feature->fi_guid) == 0)
108 			return (B_TRUE);
109 	}
110 	return (B_FALSE);
111 }
112 
113 int
114 zfeature_lookup_guid(const char *guid, spa_feature_t *res)
115 {
116 	for (spa_feature_t i = 0; i < SPA_FEATURES; i++) {
117 		zfeature_info_t *feature = &spa_feature_table[i];
118 		if (!feature->fi_zfs_mod_supported)
119 			continue;
120 		if (strcmp(guid, feature->fi_guid) == 0) {
121 			if (res != NULL)
122 				*res = i;
123 			return (0);
124 		}
125 	}
126 
127 	return (ENOENT);
128 }
129 
130 int
131 zfeature_lookup_name(const char *name, spa_feature_t *res)
132 {
133 	for (spa_feature_t i = 0; i < SPA_FEATURES; i++) {
134 		zfeature_info_t *feature = &spa_feature_table[i];
135 		if (!feature->fi_zfs_mod_supported)
136 			continue;
137 		if (strcmp(name, feature->fi_uname) == 0) {
138 			if (res != NULL)
139 				*res = i;
140 			return (0);
141 		}
142 	}
143 
144 	return (ENOENT);
145 }
146 
147 boolean_t
148 zfeature_depends_on(spa_feature_t fid, spa_feature_t check)
149 {
150 	zfeature_info_t *feature = &spa_feature_table[fid];
151 
152 	for (int i = 0; feature->fi_depends[i] != SPA_FEATURE_NONE; i++) {
153 		if (feature->fi_depends[i] == check)
154 			return (B_TRUE);
155 	}
156 	return (B_FALSE);
157 }
158 
159 static boolean_t
160 deps_contains_feature(const spa_feature_t *deps, const spa_feature_t feature)
161 {
162 	for (int i = 0; deps[i] != SPA_FEATURE_NONE; i++)
163 		if (deps[i] == feature)
164 			return (B_TRUE);
165 
166 	return (B_FALSE);
167 }
168 
169 #define	STRCMP ((int(*)(const void *, const void *))&strcmp)
170 struct zfs_mod_supported_features {
171 	void *tree;
172 	boolean_t all_features;
173 };
174 
175 struct zfs_mod_supported_features *
176 zfs_mod_list_supported(const char *scope)
177 {
178 #if defined(__FreeBSD__) || defined(_KERNEL) || defined(LIB_ZPOOL_BUILD)
179 	(void) scope;
180 	return (NULL);
181 #else
182 	struct zfs_mod_supported_features *ret = calloc(1, sizeof (*ret));
183 	if (ret == NULL)
184 		return (NULL);
185 
186 	DIR *sysfs_dir = NULL;
187 	char path[128];
188 
189 	if (snprintf(path, sizeof (path), "%s/%s",
190 	    ZFS_SYSFS_DIR, scope) < sizeof (path))
191 		sysfs_dir = opendir(path);
192 	if (sysfs_dir == NULL && errno == ENOENT) {
193 		if (snprintf(path, sizeof (path), "%s/%s",
194 		    ZFS_SYSFS_ALT_DIR, scope) < sizeof (path))
195 			sysfs_dir = opendir(path);
196 	}
197 	if (sysfs_dir == NULL) {
198 		ret->all_features = errno == ENOENT &&
199 		    (access(ZFS_SYSFS_DIR, F_OK) == 0 ||
200 		    access(ZFS_SYSFS_ALT_DIR, F_OK) == 0);
201 		return (ret);
202 	}
203 
204 	struct dirent *node;
205 	while ((node = readdir(sysfs_dir)) != NULL) {
206 		if (strcmp(node->d_name, ".") == 0 ||
207 		    strcmp(node->d_name, "..") == 0)
208 			continue;
209 
210 		char *name = strdup(node->d_name);
211 		if (name == NULL) {
212 			goto nomem;
213 		}
214 
215 		if (tsearch(name, &ret->tree, STRCMP) == NULL) {
216 			/*
217 			 * Don't bother checking for duplicate entries:
218 			 * we're iterating a single directory.
219 			 */
220 			free(name);
221 			goto nomem;
222 		}
223 	}
224 
225 end:
226 	closedir(sysfs_dir);
227 	return (ret);
228 
229 nomem:
230 	zfs_mod_list_supported_free(ret);
231 	ret = NULL;
232 	goto end;
233 #endif
234 }
235 
236 void
237 zfs_mod_list_supported_free(struct zfs_mod_supported_features *list)
238 {
239 #if !defined(__FreeBSD__) && !defined(_KERNEL) && !defined(LIB_ZPOOL_BUILD)
240 	if (list) {
241 		tdestroy(list->tree, free);
242 		free(list);
243 	}
244 #else
245 	(void) list;
246 #endif
247 }
248 
249 #if !defined(_KERNEL) && !defined(LIB_ZPOOL_BUILD)
250 static boolean_t
251 zfs_mod_supported_impl(const char *scope, const char *name, const char *sysfs)
252 {
253 	char path[128];
254 	if (snprintf(path, sizeof (path), "%s%s%s%s%s", sysfs,
255 	    scope == NULL ? "" : "/", scope ?: "",
256 	    name == NULL ? "" : "/", name ?: "") < sizeof (path))
257 		return (access(path, F_OK) == 0);
258 	else
259 		return (B_FALSE);
260 }
261 
262 boolean_t
263 zfs_mod_supported(const char *scope, const char *name,
264     const struct zfs_mod_supported_features *sfeatures)
265 {
266 	boolean_t supported;
267 
268 	if (sfeatures != NULL)
269 		return (sfeatures->all_features ||
270 		    tfind(name, &sfeatures->tree, STRCMP));
271 
272 	/*
273 	 * Check both the primary and alternate sysfs locations to determine
274 	 * if the required functionality is supported.
275 	 */
276 	supported = (zfs_mod_supported_impl(scope, name, ZFS_SYSFS_DIR) ||
277 	    zfs_mod_supported_impl(scope, name, ZFS_SYSFS_ALT_DIR));
278 
279 	/*
280 	 * For backwards compatibility with kernel modules that predate
281 	 * supported feature/property checking.  Report the feature/property
282 	 * as supported if the kernel module is loaded but the requested
283 	 * scope directory does not exist.
284 	 */
285 	if (supported == B_FALSE) {
286 		if ((access(ZFS_SYSFS_DIR, F_OK) == 0 &&
287 		    !zfs_mod_supported_impl(scope, NULL, ZFS_SYSFS_DIR)) ||
288 		    (access(ZFS_SYSFS_ALT_DIR, F_OK) == 0 &&
289 		    !zfs_mod_supported_impl(scope, NULL, ZFS_SYSFS_ALT_DIR))) {
290 			supported = B_TRUE;
291 		}
292 	}
293 
294 	return (supported);
295 }
296 #endif
297 
298 static boolean_t
299 zfs_mod_supported_feature(const char *name,
300     const struct zfs_mod_supported_features *sfeatures)
301 {
302 	/*
303 	 * The zfs module spa_feature_table[], whether in-kernel or in
304 	 * libzpool, always supports all the features. libzfs needs to
305 	 * query the running module, via sysfs, to determine which
306 	 * features are supported.
307 	 *
308 	 * The equivalent _can_ be done on FreeBSD by way of the sysctl
309 	 * tree, but this has not been done yet.  Therefore, we return
310 	 * that all features are supported.
311 	 */
312 
313 #if defined(_KERNEL) || defined(LIB_ZPOOL_BUILD) || defined(__FreeBSD__)
314 	(void) name, (void) sfeatures;
315 	return (B_TRUE);
316 #else
317 	return (zfs_mod_supported(ZFS_SYSFS_POOL_FEATURES, name, sfeatures));
318 #endif
319 }
320 
321 static void
322 zfeature_register(spa_feature_t fid, const char *guid, const char *name,
323     const char *desc, zfeature_flags_t flags, zfeature_type_t type,
324     const spa_feature_t *deps,
325     const struct zfs_mod_supported_features *sfeatures)
326 {
327 	zfeature_info_t *feature = &spa_feature_table[fid];
328 	static const spa_feature_t nodeps[] = { SPA_FEATURE_NONE };
329 
330 	ASSERT(name != NULL);
331 	ASSERT(desc != NULL);
332 	ASSERT((flags & ZFEATURE_FLAG_READONLY_COMPAT) == 0 ||
333 	    (flags & ZFEATURE_FLAG_MOS) == 0);
334 	ASSERT3U(fid, <, SPA_FEATURES);
335 	ASSERT(zfeature_is_valid_guid(guid));
336 
337 	if (deps == NULL)
338 		deps = nodeps;
339 
340 	VERIFY(((flags & ZFEATURE_FLAG_PER_DATASET) == 0) ||
341 	    (deps_contains_feature(deps, SPA_FEATURE_EXTENSIBLE_DATASET)));
342 
343 	feature->fi_feature = fid;
344 	feature->fi_guid = guid;
345 	feature->fi_uname = name;
346 	feature->fi_desc = desc;
347 	feature->fi_flags = flags;
348 	feature->fi_type = type;
349 	feature->fi_depends = deps;
350 	feature->fi_zfs_mod_supported =
351 	    zfs_mod_supported_feature(guid, sfeatures);
352 }
353 
354 /*
355  * Every feature has a GUID of the form com.example:feature_name.  The
356  * reversed DNS name ensures that the feature's GUID is unique across all ZFS
357  * implementations.  This allows companies to independently develop and
358  * release features.  Examples include org.delphix and org.datto.  Previously,
359  * features developed on one implementation have used that implementation's
360  * domain name (e.g. org.illumos and org.zfsonlinux).  Use of the org.openzfs
361  * domain name is recommended for new features which are developed by the
362  * OpenZFS community and its platforms.  This domain may optionally be used by
363  * companies developing features for initial release through an OpenZFS
364  * implementation.  Use of the org.openzfs domain requires reserving the
365  * feature name in advance with the OpenZFS project.
366  */
367 void
368 zpool_feature_init(void)
369 {
370 	struct zfs_mod_supported_features *sfeatures =
371 	    zfs_mod_list_supported(ZFS_SYSFS_POOL_FEATURES);
372 
373 	zfeature_register(SPA_FEATURE_ASYNC_DESTROY,
374 	    "com.delphix:async_destroy", "async_destroy",
375 	    "Destroy filesystems asynchronously.",
376 	    ZFEATURE_FLAG_READONLY_COMPAT, ZFEATURE_TYPE_BOOLEAN, NULL,
377 	    sfeatures);
378 
379 	zfeature_register(SPA_FEATURE_EMPTY_BPOBJ,
380 	    "com.delphix:empty_bpobj", "empty_bpobj",
381 	    "Snapshots use less space.",
382 	    ZFEATURE_FLAG_READONLY_COMPAT, ZFEATURE_TYPE_BOOLEAN, NULL,
383 	    sfeatures);
384 
385 	zfeature_register(SPA_FEATURE_LZ4_COMPRESS,
386 	    "org.illumos:lz4_compress", "lz4_compress",
387 	    "LZ4 compression algorithm support.",
388 	    ZFEATURE_FLAG_ACTIVATE_ON_ENABLE, ZFEATURE_TYPE_BOOLEAN, NULL,
389 	    sfeatures);
390 
391 	zfeature_register(SPA_FEATURE_MULTI_VDEV_CRASH_DUMP,
392 	    "com.joyent:multi_vdev_crash_dump", "multi_vdev_crash_dump",
393 	    "Crash dumps to multiple vdev pools.",
394 	    0, ZFEATURE_TYPE_BOOLEAN, NULL, sfeatures);
395 
396 	zfeature_register(SPA_FEATURE_SPACEMAP_HISTOGRAM,
397 	    "com.delphix:spacemap_histogram", "spacemap_histogram",
398 	    "Spacemaps maintain space histograms.",
399 	    ZFEATURE_FLAG_READONLY_COMPAT, ZFEATURE_TYPE_BOOLEAN, NULL,
400 	    sfeatures);
401 
402 	zfeature_register(SPA_FEATURE_ENABLED_TXG,
403 	    "com.delphix:enabled_txg", "enabled_txg",
404 	    "Record txg at which a feature is enabled",
405 	    ZFEATURE_FLAG_READONLY_COMPAT, ZFEATURE_TYPE_BOOLEAN, NULL,
406 	    sfeatures);
407 
408 	{
409 		static const spa_feature_t hole_birth_deps[] = {
410 			SPA_FEATURE_ENABLED_TXG,
411 			SPA_FEATURE_NONE
412 		};
413 		zfeature_register(SPA_FEATURE_HOLE_BIRTH,
414 		    "com.delphix:hole_birth", "hole_birth",
415 		    "Retain hole birth txg for more precise zfs send",
416 		    ZFEATURE_FLAG_MOS | ZFEATURE_FLAG_ACTIVATE_ON_ENABLE,
417 		    ZFEATURE_TYPE_BOOLEAN, hole_birth_deps, sfeatures);
418 	}
419 
420 	zfeature_register(SPA_FEATURE_POOL_CHECKPOINT,
421 	    "com.delphix:zpool_checkpoint", "zpool_checkpoint",
422 	    "Pool state can be checkpointed, allowing rewind later.",
423 	    ZFEATURE_FLAG_READONLY_COMPAT, ZFEATURE_TYPE_BOOLEAN, NULL,
424 	    sfeatures);
425 
426 	zfeature_register(SPA_FEATURE_SPACEMAP_V2,
427 	    "com.delphix:spacemap_v2", "spacemap_v2",
428 	    "Space maps representing large segments are more efficient.",
429 	    ZFEATURE_FLAG_READONLY_COMPAT | ZFEATURE_FLAG_ACTIVATE_ON_ENABLE,
430 	    ZFEATURE_TYPE_BOOLEAN, NULL, sfeatures);
431 
432 	zfeature_register(SPA_FEATURE_EXTENSIBLE_DATASET,
433 	    "com.delphix:extensible_dataset", "extensible_dataset",
434 	    "Enhanced dataset functionality, used by other features.",
435 	    0, ZFEATURE_TYPE_BOOLEAN, NULL, sfeatures);
436 
437 	{
438 		static const spa_feature_t bookmarks_deps[] = {
439 			SPA_FEATURE_EXTENSIBLE_DATASET,
440 			SPA_FEATURE_NONE
441 		};
442 
443 		zfeature_register(SPA_FEATURE_BOOKMARKS,
444 		    "com.delphix:bookmarks", "bookmarks",
445 		    "\"zfs bookmark\" command",
446 		    ZFEATURE_FLAG_READONLY_COMPAT, ZFEATURE_TYPE_BOOLEAN,
447 		    bookmarks_deps, sfeatures);
448 	}
449 
450 	{
451 		static const spa_feature_t filesystem_limits_deps[] = {
452 			SPA_FEATURE_EXTENSIBLE_DATASET,
453 			SPA_FEATURE_NONE
454 		};
455 		zfeature_register(SPA_FEATURE_FS_SS_LIMIT,
456 		    "com.joyent:filesystem_limits", "filesystem_limits",
457 		    "Filesystem and snapshot limits.",
458 		    ZFEATURE_FLAG_READONLY_COMPAT, ZFEATURE_TYPE_BOOLEAN,
459 		    filesystem_limits_deps, sfeatures);
460 	}
461 
462 	zfeature_register(SPA_FEATURE_EMBEDDED_DATA,
463 	    "com.delphix:embedded_data", "embedded_data",
464 	    "Blocks which compress very well use even less space.",
465 	    ZFEATURE_FLAG_MOS | ZFEATURE_FLAG_ACTIVATE_ON_ENABLE,
466 	    ZFEATURE_TYPE_BOOLEAN, NULL, sfeatures);
467 
468 	{
469 		static const spa_feature_t livelist_deps[] = {
470 			SPA_FEATURE_EXTENSIBLE_DATASET,
471 			SPA_FEATURE_NONE
472 		};
473 		zfeature_register(SPA_FEATURE_LIVELIST,
474 		    "com.delphix:livelist", "livelist",
475 		    "Improved clone deletion performance.",
476 		    ZFEATURE_FLAG_READONLY_COMPAT, ZFEATURE_TYPE_BOOLEAN,
477 		    livelist_deps, sfeatures);
478 	}
479 
480 	{
481 		static const spa_feature_t log_spacemap_deps[] = {
482 			SPA_FEATURE_SPACEMAP_V2,
483 			SPA_FEATURE_NONE
484 		};
485 		zfeature_register(SPA_FEATURE_LOG_SPACEMAP,
486 		    "com.delphix:log_spacemap", "log_spacemap",
487 		    "Log metaslab changes on a single spacemap and "
488 		    "flush them periodically.",
489 		    ZFEATURE_FLAG_READONLY_COMPAT, ZFEATURE_TYPE_BOOLEAN,
490 		    log_spacemap_deps, sfeatures);
491 	}
492 
493 	{
494 		static const spa_feature_t large_blocks_deps[] = {
495 			SPA_FEATURE_EXTENSIBLE_DATASET,
496 			SPA_FEATURE_NONE
497 		};
498 		zfeature_register(SPA_FEATURE_LARGE_BLOCKS,
499 		    "org.open-zfs:large_blocks", "large_blocks",
500 		    "Support for blocks larger than 128KB.",
501 		    ZFEATURE_FLAG_PER_DATASET, ZFEATURE_TYPE_BOOLEAN,
502 		    large_blocks_deps, sfeatures);
503 	}
504 
505 	{
506 		static const spa_feature_t large_dnode_deps[] = {
507 			SPA_FEATURE_EXTENSIBLE_DATASET,
508 			SPA_FEATURE_NONE
509 		};
510 		zfeature_register(SPA_FEATURE_LARGE_DNODE,
511 		    "org.zfsonlinux:large_dnode", "large_dnode",
512 		    "Variable on-disk size of dnodes.",
513 		    ZFEATURE_FLAG_PER_DATASET, ZFEATURE_TYPE_BOOLEAN,
514 		    large_dnode_deps, sfeatures);
515 	}
516 
517 	{
518 		static const spa_feature_t sha512_deps[] = {
519 			SPA_FEATURE_EXTENSIBLE_DATASET,
520 			SPA_FEATURE_NONE
521 		};
522 		zfeature_register(SPA_FEATURE_SHA512,
523 		    "org.illumos:sha512", "sha512",
524 		    "SHA-512/256 hash algorithm.",
525 		    ZFEATURE_FLAG_PER_DATASET, ZFEATURE_TYPE_BOOLEAN,
526 		    sha512_deps, sfeatures);
527 	}
528 
529 	{
530 		static const spa_feature_t skein_deps[] = {
531 			SPA_FEATURE_EXTENSIBLE_DATASET,
532 			SPA_FEATURE_NONE
533 		};
534 		zfeature_register(SPA_FEATURE_SKEIN,
535 		    "org.illumos:skein", "skein",
536 		    "Skein hash algorithm.",
537 		    ZFEATURE_FLAG_PER_DATASET, ZFEATURE_TYPE_BOOLEAN,
538 		    skein_deps, sfeatures);
539 	}
540 
541 	{
542 		static const spa_feature_t edonr_deps[] = {
543 			SPA_FEATURE_EXTENSIBLE_DATASET,
544 			SPA_FEATURE_NONE
545 		};
546 		zfeature_register(SPA_FEATURE_EDONR,
547 		    "org.illumos:edonr", "edonr",
548 		    "Edon-R hash algorithm.",
549 		    ZFEATURE_FLAG_PER_DATASET, ZFEATURE_TYPE_BOOLEAN,
550 		    edonr_deps, sfeatures);
551 	}
552 
553 	{
554 		static const spa_feature_t redact_books_deps[] = {
555 			SPA_FEATURE_BOOKMARK_V2,
556 			SPA_FEATURE_EXTENSIBLE_DATASET,
557 			SPA_FEATURE_BOOKMARKS,
558 			SPA_FEATURE_NONE
559 		};
560 		zfeature_register(SPA_FEATURE_REDACTION_BOOKMARKS,
561 		    "com.delphix:redaction_bookmarks", "redaction_bookmarks",
562 		    "Support for bookmarks which store redaction lists for zfs "
563 		    "redacted send/recv.", 0, ZFEATURE_TYPE_BOOLEAN,
564 		    redact_books_deps, sfeatures);
565 	}
566 
567 	{
568 		static const spa_feature_t redact_datasets_deps[] = {
569 			SPA_FEATURE_EXTENSIBLE_DATASET,
570 			SPA_FEATURE_NONE
571 		};
572 		zfeature_register(SPA_FEATURE_REDACTED_DATASETS,
573 		    "com.delphix:redacted_datasets", "redacted_datasets",
574 		    "Support for redacted datasets, produced by receiving "
575 		    "a redacted zfs send stream.",
576 		    ZFEATURE_FLAG_PER_DATASET, ZFEATURE_TYPE_UINT64_ARRAY,
577 		    redact_datasets_deps, sfeatures);
578 	}
579 
580 	{
581 		static const spa_feature_t bookmark_written_deps[] = {
582 			SPA_FEATURE_BOOKMARK_V2,
583 			SPA_FEATURE_EXTENSIBLE_DATASET,
584 			SPA_FEATURE_BOOKMARKS,
585 			SPA_FEATURE_NONE
586 		};
587 		zfeature_register(SPA_FEATURE_BOOKMARK_WRITTEN,
588 		    "com.delphix:bookmark_written", "bookmark_written",
589 		    "Additional accounting, enabling the written#<bookmark> "
590 		    "property (space written since a bookmark), "
591 		    "and estimates of send stream sizes for incrementals from "
592 		    "bookmarks.",
593 		    0, ZFEATURE_TYPE_BOOLEAN, bookmark_written_deps, sfeatures);
594 	}
595 
596 	zfeature_register(SPA_FEATURE_DEVICE_REMOVAL,
597 	    "com.delphix:device_removal", "device_removal",
598 	    "Top-level vdevs can be removed, reducing logical pool size.",
599 	    ZFEATURE_FLAG_MOS, ZFEATURE_TYPE_BOOLEAN, NULL, sfeatures);
600 
601 	{
602 		static const spa_feature_t obsolete_counts_deps[] = {
603 			SPA_FEATURE_EXTENSIBLE_DATASET,
604 			SPA_FEATURE_DEVICE_REMOVAL,
605 			SPA_FEATURE_NONE
606 		};
607 		zfeature_register(SPA_FEATURE_OBSOLETE_COUNTS,
608 		    "com.delphix:obsolete_counts", "obsolete_counts",
609 		    "Reduce memory used by removed devices when their blocks "
610 		    "are freed or remapped.",
611 		    ZFEATURE_FLAG_READONLY_COMPAT, ZFEATURE_TYPE_BOOLEAN,
612 		    obsolete_counts_deps, sfeatures);
613 	}
614 
615 	{
616 		static const spa_feature_t userobj_accounting_deps[] = {
617 			SPA_FEATURE_EXTENSIBLE_DATASET,
618 			SPA_FEATURE_NONE
619 		};
620 		zfeature_register(SPA_FEATURE_USEROBJ_ACCOUNTING,
621 		    "org.zfsonlinux:userobj_accounting", "userobj_accounting",
622 		    "User/Group object accounting.",
623 		    ZFEATURE_FLAG_READONLY_COMPAT | ZFEATURE_FLAG_PER_DATASET,
624 		    ZFEATURE_TYPE_BOOLEAN, userobj_accounting_deps, sfeatures);
625 	}
626 
627 	{
628 		static const spa_feature_t bookmark_v2_deps[] = {
629 			SPA_FEATURE_EXTENSIBLE_DATASET,
630 			SPA_FEATURE_BOOKMARKS,
631 			SPA_FEATURE_NONE
632 		};
633 		zfeature_register(SPA_FEATURE_BOOKMARK_V2,
634 		    "com.datto:bookmark_v2", "bookmark_v2",
635 		    "Support for larger bookmarks",
636 		    0, ZFEATURE_TYPE_BOOLEAN, bookmark_v2_deps, sfeatures);
637 	}
638 
639 	{
640 		static const spa_feature_t encryption_deps[] = {
641 			SPA_FEATURE_EXTENSIBLE_DATASET,
642 			SPA_FEATURE_BOOKMARK_V2,
643 			SPA_FEATURE_NONE
644 		};
645 		zfeature_register(SPA_FEATURE_ENCRYPTION,
646 		    "com.datto:encryption", "encryption",
647 		    "Support for dataset level encryption",
648 		    ZFEATURE_FLAG_PER_DATASET, ZFEATURE_TYPE_BOOLEAN,
649 		    encryption_deps, sfeatures);
650 	}
651 
652 	{
653 		static const spa_feature_t project_quota_deps[] = {
654 			SPA_FEATURE_EXTENSIBLE_DATASET,
655 			SPA_FEATURE_NONE
656 		};
657 		zfeature_register(SPA_FEATURE_PROJECT_QUOTA,
658 		    "org.zfsonlinux:project_quota", "project_quota",
659 		    "space/object accounting based on project ID.",
660 		    ZFEATURE_FLAG_READONLY_COMPAT | ZFEATURE_FLAG_PER_DATASET,
661 		    ZFEATURE_TYPE_BOOLEAN, project_quota_deps, sfeatures);
662 	}
663 
664 	zfeature_register(SPA_FEATURE_ALLOCATION_CLASSES,
665 	    "org.zfsonlinux:allocation_classes", "allocation_classes",
666 	    "Support for separate allocation classes.",
667 	    ZFEATURE_FLAG_READONLY_COMPAT, ZFEATURE_TYPE_BOOLEAN, NULL,
668 	    sfeatures);
669 
670 	zfeature_register(SPA_FEATURE_RESILVER_DEFER,
671 	    "com.datto:resilver_defer", "resilver_defer",
672 	    "Support for deferring new resilvers when one is already running.",
673 	    ZFEATURE_FLAG_READONLY_COMPAT, ZFEATURE_TYPE_BOOLEAN, NULL,
674 	    sfeatures);
675 
676 	zfeature_register(SPA_FEATURE_DEVICE_REBUILD,
677 	    "org.openzfs:device_rebuild", "device_rebuild",
678 	    "Support for sequential mirror/dRAID device rebuilds",
679 	    ZFEATURE_FLAG_READONLY_COMPAT, ZFEATURE_TYPE_BOOLEAN, NULL,
680 	    sfeatures);
681 
682 	{
683 		static const spa_feature_t zstd_deps[] = {
684 			SPA_FEATURE_EXTENSIBLE_DATASET,
685 			SPA_FEATURE_NONE
686 		};
687 		zfeature_register(SPA_FEATURE_ZSTD_COMPRESS,
688 		    "org.freebsd:zstd_compress", "zstd_compress",
689 		    "zstd compression algorithm support.",
690 		    ZFEATURE_FLAG_PER_DATASET, ZFEATURE_TYPE_BOOLEAN, zstd_deps,
691 		    sfeatures);
692 	}
693 
694 	zfeature_register(SPA_FEATURE_DRAID,
695 	    "org.openzfs:draid", "draid", "Support for distributed spare RAID",
696 	    ZFEATURE_FLAG_MOS, ZFEATURE_TYPE_BOOLEAN, NULL, sfeatures);
697 
698 	{
699 		static const spa_feature_t zilsaxattr_deps[] = {
700 			SPA_FEATURE_EXTENSIBLE_DATASET,
701 			SPA_FEATURE_NONE
702 		};
703 		zfeature_register(SPA_FEATURE_ZILSAXATTR,
704 		    "org.openzfs:zilsaxattr", "zilsaxattr",
705 		    "Support for xattr=sa extended attribute logging in ZIL.",
706 		    ZFEATURE_FLAG_PER_DATASET | ZFEATURE_FLAG_READONLY_COMPAT,
707 		    ZFEATURE_TYPE_BOOLEAN, zilsaxattr_deps, sfeatures);
708 	}
709 
710 	zfeature_register(SPA_FEATURE_HEAD_ERRLOG,
711 	    "com.delphix:head_errlog", "head_errlog",
712 	    "Support for per-dataset on-disk error logs.",
713 	    ZFEATURE_FLAG_ACTIVATE_ON_ENABLE, ZFEATURE_TYPE_BOOLEAN, NULL,
714 	    sfeatures);
715 
716 	{
717 		static const spa_feature_t blake3_deps[] = {
718 			SPA_FEATURE_EXTENSIBLE_DATASET,
719 			SPA_FEATURE_NONE
720 		};
721 		zfeature_register(SPA_FEATURE_BLAKE3,
722 		    "org.openzfs:blake3", "blake3",
723 		    "BLAKE3 hash algorithm.",
724 		    ZFEATURE_FLAG_PER_DATASET, ZFEATURE_TYPE_BOOLEAN,
725 		    blake3_deps, sfeatures);
726 	}
727 
728 	zfeature_register(SPA_FEATURE_BLOCK_CLONING,
729 	    "com.fudosecurity:block_cloning", "block_cloning",
730 	    "Support for block cloning via Block Reference Table.",
731 	    ZFEATURE_FLAG_READONLY_COMPAT, ZFEATURE_TYPE_BOOLEAN, NULL,
732 	    sfeatures);
733 
734 	zfeature_register(SPA_FEATURE_AVZ_V2,
735 	    "com.klarasystems:vdev_zaps_v2", "vdev_zaps_v2",
736 	    "Support for root vdev ZAP.",
737 	    ZFEATURE_FLAG_MOS, ZFEATURE_TYPE_BOOLEAN, NULL,
738 	    sfeatures);
739 
740 	{
741 		static const spa_feature_t redact_list_spill_deps[] = {
742 			SPA_FEATURE_REDACTION_BOOKMARKS,
743 			SPA_FEATURE_NONE
744 		};
745 		zfeature_register(SPA_FEATURE_REDACTION_LIST_SPILL,
746 		    "com.delphix:redaction_list_spill", "redaction_list_spill",
747 		    "Support for increased number of redaction_snapshot "
748 		    "arguments in zfs redact.", 0, ZFEATURE_TYPE_BOOLEAN,
749 		    redact_list_spill_deps, sfeatures);
750 	}
751 
752 	zfs_mod_list_supported_free(sfeatures);
753 }
754 
755 #if defined(_KERNEL)
756 EXPORT_SYMBOL(zfeature_lookup_guid);
757 EXPORT_SYMBOL(zfeature_lookup_name);
758 EXPORT_SYMBOL(zfeature_is_supported);
759 EXPORT_SYMBOL(zfeature_is_valid_guid);
760 EXPORT_SYMBOL(zfeature_depends_on);
761 EXPORT_SYMBOL(zpool_feature_init);
762 EXPORT_SYMBOL(spa_feature_table);
763 #endif
764