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) 2013 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 */
28
29 #ifdef _KERNEL
30 #include <sys/systm.h>
31 #else
32 #include <errno.h>
33 #include <string.h>
34 #endif
35 #include <sys/debug.h>
36 #include <sys/fs/zfs.h>
37 #include <sys/inttypes.h>
38 #include <sys/types.h>
39 #include "zfeature_common.h"
40
41 /*
42 * Set to disable all feature checks while opening pools, allowing pools with
43 * unsupported features to be opened. Set for testing only.
44 */
45 boolean_t zfeature_checks_disable = B_FALSE;
46
47 zfeature_info_t spa_feature_table[SPA_FEATURES];
48
49 /*
50 * Valid characters for feature guids. This list is mainly for aesthetic
51 * purposes and could be expanded in the future. There are different allowed
52 * characters in the guids reverse dns portion (before the colon) and its
53 * short name (after the colon).
54 */
55 static int
56 valid_char(char c, boolean_t after_colon)
57 {
58 return ((c >= 'a' && c <= 'z') ||
59 (c >= '0' && c <= '9') ||
60 c == (after_colon ? '_' : '.'));
61 }
62
63 /*
64 * Every feature guid must contain exactly one colon which separates a reverse
65 * dns organization name from the feature's "short" name (e.g.
66 * "com.company:feature_name").
67 */
68 boolean_t
69 zfeature_is_valid_guid(const char *name)
70 {
71 int i;
72 boolean_t has_colon = B_FALSE;
73
74 i = 0;
75 while (name[i] != '\0') {
76 char c = name[i++];
77 if (c == ':') {
78 if (has_colon)
79 return (B_FALSE);
80 has_colon = B_TRUE;
81 continue;
82 }
83 if (!valid_char(c, has_colon))
84 return (B_FALSE);
85 }
86
87 return (has_colon);
88 }
89
90 boolean_t
91 zfeature_is_supported(const char *guid)
92 {
93 if (zfeature_checks_disable)
94 return (B_TRUE);
95
96 for (spa_feature_t i = 0; i < SPA_FEATURES; i++) {
97 zfeature_info_t *feature = &spa_feature_table[i];
98 if (strcmp(guid, feature->fi_guid) == 0)
99 return (B_TRUE);
100 }
101 return (B_FALSE);
102 }
103
104 int
105 zfeature_lookup_name(const char *name, spa_feature_t *res)
106 {
107 for (spa_feature_t i = 0; i < SPA_FEATURES; i++) {
108 zfeature_info_t *feature = &spa_feature_table[i];
109 if (strcmp(name, feature->fi_uname) == 0) {
110 if (res != NULL)
111 *res = i;
112 return (0);
113 }
114 }
115
116 return (ENOENT);
117 }
118
119 boolean_t
120 zfeature_depends_on(spa_feature_t fid, spa_feature_t check) {
121 zfeature_info_t *feature = &spa_feature_table[fid];
122
123 for (int i = 0; feature->fi_depends[i] != SPA_FEATURE_NONE; i++) {
124 if (feature->fi_depends[i] == check)
125 return (B_TRUE);
126 }
127 return (B_FALSE);
128 }
129
130 static void
131 zfeature_register(spa_feature_t fid, const char *guid, const char *name,
132 const char *desc, boolean_t readonly, boolean_t mos,
133 boolean_t activate_on_enable, const spa_feature_t *deps)
134 {
135 zfeature_info_t *feature = &spa_feature_table[fid];
136 static spa_feature_t nodeps[] = { SPA_FEATURE_NONE };
137
138 ASSERT(name != NULL);
139 ASSERT(desc != NULL);
140 ASSERT(!readonly || !mos);
141 ASSERT3U(fid, <, SPA_FEATURES);
142 ASSERT(zfeature_is_valid_guid(guid));
143
144 if (deps == NULL)
145 deps = nodeps;
146
147 feature->fi_feature = fid;
148 feature->fi_guid = guid;
149 feature->fi_uname = name;
150 feature->fi_desc = desc;
151 feature->fi_can_readonly = readonly;
152 feature->fi_mos = mos;
153 feature->fi_activate_on_enable = activate_on_enable;
154 feature->fi_depends = deps;
155 }
156
157 void
158 zpool_feature_init(void)
159 {
160 zfeature_register(SPA_FEATURE_ASYNC_DESTROY,
161 "com.delphix:async_destroy", "async_destroy",
162 "Destroy filesystems asynchronously.", B_TRUE, B_FALSE,
163 B_FALSE, NULL);
164
165 zfeature_register(SPA_FEATURE_EMPTY_BPOBJ,
166 "com.delphix:empty_bpobj", "empty_bpobj",
167 "Snapshots use less space.", B_TRUE, B_FALSE,
168 B_FALSE, NULL);
169
170 zfeature_register(SPA_FEATURE_LZ4_COMPRESS,
171 "org.illumos:lz4_compress", "lz4_compress",
172 "LZ4 compression algorithm support.", B_FALSE, B_FALSE,
173 B_TRUE, NULL);
174
175 zfeature_register(SPA_FEATURE_MULTI_VDEV_CRASH_DUMP,
176 "com.joyent:multi_vdev_crash_dump", "multi_vdev_crash_dump",
177 "Crash dumps to multiple vdev pools.", B_FALSE, B_FALSE,
178 B_FALSE, NULL);
179
180 zfeature_register(SPA_FEATURE_SPACEMAP_HISTOGRAM,
181 "com.delphix:spacemap_histogram", "spacemap_histogram",
182 "Spacemaps maintain space histograms.", B_TRUE, B_FALSE,
183 B_FALSE, NULL);
184
185 zfeature_register(SPA_FEATURE_ENABLED_TXG,
186 "com.delphix:enabled_txg", "enabled_txg",
187 "Record txg at which a feature is enabled", B_TRUE, B_FALSE,
188 B_FALSE, NULL);
189
190 static spa_feature_t hole_birth_deps[] = { SPA_FEATURE_ENABLED_TXG,
191 SPA_FEATURE_NONE };
192 zfeature_register(SPA_FEATURE_HOLE_BIRTH,
193 "com.delphix:hole_birth", "hole_birth",
194 "Retain hole birth txg for more precise zfs send",
195 B_FALSE, B_TRUE, B_TRUE, hole_birth_deps);
196
197 zfeature_register(SPA_FEATURE_EXTENSIBLE_DATASET,
198 "com.delphix:extensible_dataset", "extensible_dataset",
199 "Enhanced dataset functionality, used by other features.",
200 B_FALSE, B_FALSE, B_FALSE, NULL);
201
202 static const spa_feature_t bookmarks_deps[] = {
203 SPA_FEATURE_EXTENSIBLE_DATASET,
204 SPA_FEATURE_NONE
205 };
206 zfeature_register(SPA_FEATURE_BOOKMARKS,
207 "com.delphix:bookmarks", "bookmarks",
208 "\"zfs bookmark\" command",
209 B_TRUE, B_FALSE, B_FALSE, bookmarks_deps);
210
211 static const spa_feature_t filesystem_limits_deps[] = {
212 SPA_FEATURE_EXTENSIBLE_DATASET,
213 SPA_FEATURE_NONE
214 };
215 zfeature_register(SPA_FEATURE_FS_SS_LIMIT,
216 "com.joyent:filesystem_limits", "filesystem_limits",
217 "Filesystem and snapshot limits.", B_TRUE, B_FALSE, B_FALSE,
218 filesystem_limits_deps);
219 }