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) 2011, 2015 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) 2014 Integros [integros.com]
28 */
29
30 #ifdef _KERNEL
31 #include <sys/systm.h>
32 #else
33 #include <errno.h>
34 #include <string.h>
35 #endif
36 #include <sys/debug.h>
37 #include <sys/fs/zfs.h>
38 #include <sys/inttypes.h>
39 #include <sys/types.h>
40 #include "zfeature_common.h"
41
42 /*
43 * Set to disable all feature checks while opening pools, allowing pools with
44 * unsupported features to be opened. Set for testing only.
45 */
46 boolean_t zfeature_checks_disable = B_FALSE;
47
48 zfeature_info_t spa_feature_table[SPA_FEATURES];
49
50 /*
51 * Valid characters for feature guids. This list is mainly for aesthetic
52 * purposes and could be expanded in the future. There are different allowed
53 * characters in the guids reverse dns portion (before the colon) and its
54 * short name (after the colon).
55 */
56 static int
57 valid_char(char c, boolean_t after_colon)
58 {
59 return ((c >= 'a' && c <= 'z') ||
60 (c >= '0' && c <= '9') ||
61 (after_colon && c == '_') ||
62 (!after_colon && (c == '.' || c == '-')));
63 }
64
65 /*
66 * Every feature guid must contain exactly one colon which separates a reverse
67 * dns organization name from the feature's "short" name (e.g.
68 * "com.company:feature_name").
69 */
70 boolean_t
71 zfeature_is_valid_guid(const char *name)
72 {
73 int i;
74 boolean_t has_colon = B_FALSE;
75
76 i = 0;
77 while (name[i] != '\0') {
78 char c = name[i++];
79 if (c == ':') {
80 if (has_colon)
81 return (B_FALSE);
82 has_colon = B_TRUE;
83 continue;
84 }
85 if (!valid_char(c, has_colon))
86 return (B_FALSE);
87 }
88
89 return (has_colon);
90 }
91
92 boolean_t
93 zfeature_is_supported(const char *guid)
94 {
95 if (zfeature_checks_disable)
96 return (B_TRUE);
97
98 for (spa_feature_t i = 0; i < SPA_FEATURES; i++) {
99 zfeature_info_t *feature = &spa_feature_table[i];
100 if (strcmp(guid, feature->fi_guid) == 0)
101 return (B_TRUE);
102 }
103 return (B_FALSE);
104 }
105
106 int
107 zfeature_lookup_name(const char *name, spa_feature_t *res)
108 {
109 for (spa_feature_t i = 0; i < SPA_FEATURES; i++) {
110 zfeature_info_t *feature = &spa_feature_table[i];
111 if (strcmp(name, feature->fi_uname) == 0) {
112 if (res != NULL)
113 *res = i;
114 return (0);
115 }
116 }
117
118 return (ENOENT);
119 }
120
121 boolean_t
122 zfeature_depends_on(spa_feature_t fid, spa_feature_t check)
123 {
124 zfeature_info_t *feature = &spa_feature_table[fid];
125
126 for (int i = 0; feature->fi_depends[i] != SPA_FEATURE_NONE; i++) {
127 if (feature->fi_depends[i] == check)
128 return (B_TRUE);
129 }
130 return (B_FALSE);
131 }
132
133 static boolean_t
134 deps_contains_feature(const spa_feature_t *deps, const spa_feature_t feature)
135 {
136 for (int i = 0; deps[i] != SPA_FEATURE_NONE; i++)
137 if (deps[i] == feature)
138 return (B_TRUE);
139
140 return (B_FALSE);
141 }
142
143 static void
144 zfeature_register(spa_feature_t fid, const char *guid, const char *name,
145 const char *desc, zfeature_flags_t flags, const spa_feature_t *deps)
146 {
147 zfeature_info_t *feature = &spa_feature_table[fid];
148 static spa_feature_t nodeps[] = { SPA_FEATURE_NONE };
149
150 ASSERT(name != NULL);
151 ASSERT(desc != NULL);
152 ASSERT((flags & ZFEATURE_FLAG_READONLY_COMPAT) == 0 ||
153 (flags & ZFEATURE_FLAG_MOS) == 0);
154 ASSERT3U(fid, <, SPA_FEATURES);
155 ASSERT(zfeature_is_valid_guid(guid));
156
157 if (deps == NULL)
158 deps = nodeps;
159
160 VERIFY(((flags & ZFEATURE_FLAG_PER_DATASET) == 0) ||
161 (deps_contains_feature(deps, SPA_FEATURE_EXTENSIBLE_DATASET)));
162
163 feature->fi_feature = fid;
164 feature->fi_guid = guid;
165 feature->fi_uname = name;
166 feature->fi_desc = desc;
167 feature->fi_flags = flags;
168 feature->fi_depends = deps;
169 }
170
171 void
172 zpool_feature_init(void)
173 {
174 zfeature_register(SPA_FEATURE_ASYNC_DESTROY,
175 "com.delphix:async_destroy", "async_destroy",
176 "Destroy filesystems asynchronously.",
177 ZFEATURE_FLAG_READONLY_COMPAT, NULL);
178
179 zfeature_register(SPA_FEATURE_EMPTY_BPOBJ,
180 "com.delphix:empty_bpobj", "empty_bpobj",
181 "Snapshots use less space.",
182 ZFEATURE_FLAG_READONLY_COMPAT, NULL);
183
184 zfeature_register(SPA_FEATURE_LZ4_COMPRESS,
185 "org.illumos:lz4_compress", "lz4_compress",
186 "LZ4 compression algorithm support.",
187 ZFEATURE_FLAG_ACTIVATE_ON_ENABLE, NULL);
188
189 zfeature_register(SPA_FEATURE_MULTI_VDEV_CRASH_DUMP,
190 "com.joyent:multi_vdev_crash_dump", "multi_vdev_crash_dump",
191 "Crash dumps to multiple vdev pools.",
192 0, NULL);
193
194 zfeature_register(SPA_FEATURE_SPACEMAP_HISTOGRAM,
195 "com.delphix:spacemap_histogram", "spacemap_histogram",
196 "Spacemaps maintain space histograms.",
197 ZFEATURE_FLAG_READONLY_COMPAT, NULL);
198
199 zfeature_register(SPA_FEATURE_ENABLED_TXG,
200 "com.delphix:enabled_txg", "enabled_txg",
201 "Record txg at which a feature is enabled",
202 ZFEATURE_FLAG_READONLY_COMPAT, NULL);
203
204 static spa_feature_t hole_birth_deps[] = {
205 SPA_FEATURE_ENABLED_TXG,
206 SPA_FEATURE_NONE
207 };
208 zfeature_register(SPA_FEATURE_HOLE_BIRTH,
209 "com.delphix:hole_birth", "hole_birth",
210 "Retain hole birth txg for more precise zfs send",
211 ZFEATURE_FLAG_MOS | ZFEATURE_FLAG_ACTIVATE_ON_ENABLE,
212 hole_birth_deps);
213
214 zfeature_register(SPA_FEATURE_EXTENSIBLE_DATASET,
215 "com.delphix:extensible_dataset", "extensible_dataset",
216 "Enhanced dataset functionality, used by other features.",
217 0, NULL);
218
219 static const spa_feature_t bookmarks_deps[] = {
220 SPA_FEATURE_EXTENSIBLE_DATASET,
221 SPA_FEATURE_NONE
222 };
223 zfeature_register(SPA_FEATURE_BOOKMARKS,
224 "com.delphix:bookmarks", "bookmarks",
225 "\"zfs bookmark\" command",
226 ZFEATURE_FLAG_READONLY_COMPAT, bookmarks_deps);
227
228 static const spa_feature_t filesystem_limits_deps[] = {
229 SPA_FEATURE_EXTENSIBLE_DATASET,
230 SPA_FEATURE_NONE
231 };
232 zfeature_register(SPA_FEATURE_FS_SS_LIMIT,
233 "com.joyent:filesystem_limits", "filesystem_limits",
234 "Filesystem and snapshot limits.",
235 ZFEATURE_FLAG_READONLY_COMPAT, filesystem_limits_deps);
236
237 zfeature_register(SPA_FEATURE_EMBEDDED_DATA,
238 "com.delphix:embedded_data", "embedded_data",
239 "Blocks which compress very well use even less space.",
240 ZFEATURE_FLAG_MOS | ZFEATURE_FLAG_ACTIVATE_ON_ENABLE,
241 NULL);
242
243 static const spa_feature_t large_blocks_deps[] = {
244 SPA_FEATURE_EXTENSIBLE_DATASET,
245 SPA_FEATURE_NONE
246 };
247 zfeature_register(SPA_FEATURE_LARGE_BLOCKS,
248 "org.open-zfs:large_blocks", "large_blocks",
249 "Support for blocks larger than 128KB.",
250 ZFEATURE_FLAG_PER_DATASET, large_blocks_deps);
251
252 static const spa_feature_t sha512_deps[] = {
253 SPA_FEATURE_EXTENSIBLE_DATASET,
254 SPA_FEATURE_NONE
255 };
256 zfeature_register(SPA_FEATURE_SHA512,
257 "org.illumos:sha512", "sha512",
258 "SHA-512/256 hash algorithm.",
259 ZFEATURE_FLAG_PER_DATASET, sha512_deps);
260
261 static const spa_feature_t skein_deps[] = {
262 SPA_FEATURE_EXTENSIBLE_DATASET,
263 SPA_FEATURE_NONE
264 };
265 zfeature_register(SPA_FEATURE_SKEIN,
266 "org.illumos:skein", "skein",
267 "Skein hash algorithm.",
268 ZFEATURE_FLAG_PER_DATASET, skein_deps);
269
270 static const spa_feature_t edonr_deps[] = {
271 SPA_FEATURE_EXTENSIBLE_DATASET,
272 SPA_FEATURE_NONE
273 };
274 zfeature_register(SPA_FEATURE_EDONR,
275 "org.illumos:edonr", "edonr",
276 "Edon-R hash algorithm.",
277 ZFEATURE_FLAG_PER_DATASET, edonr_deps);
278
279 zfeature_register(SPA_FEATURE_DEVICE_REMOVAL,
280 "com.delphix:device_removal", "device_removal",
281 "Top-level vdevs can be removed, reducing logical pool size.",
282 ZFEATURE_FLAG_MOS, NULL);
283
284 static const spa_feature_t obsolete_counts_deps[] = {
285 SPA_FEATURE_EXTENSIBLE_DATASET,
286 SPA_FEATURE_DEVICE_REMOVAL,
287 SPA_FEATURE_NONE
288 };
289 zfeature_register(SPA_FEATURE_OBSOLETE_COUNTS,
290 "com.delphix:obsolete_counts", "obsolete_counts",
291 "Reduce memory used by removed devices when their blocks are "
292 "freed or remapped.",
293 ZFEATURE_FLAG_READONLY_COMPAT, obsolete_counts_deps);
294 }