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--- old/usr/src/common/zfs/zfeature_common.c
+++ new/usr/src/common/zfs/zfeature_common.c
1 1 /*
2 2 * CDDL HEADER START
3 3 *
4 4 * The contents of this file are subject to the terms of the
5 5 * Common Development and Distribution License (the "License").
6 6 * You may not use this file except in compliance with the License.
7 7 *
8 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 9 * or http://www.opensolaris.org/os/licensing.
10 10 * See the License for the specific language governing permissions
11 11 * and limitations under the License.
12 12 *
13 13 * When distributing Covered Code, include this CDDL HEADER in each
14 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 15 * If applicable, add the following below this CDDL HEADER, with the
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16 16 * fields enclosed by brackets "[]" replaced with your own identifying
17 17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 18 *
19 19 * CDDL HEADER END
20 20 */
21 21
22 22 /*
23 23 * Copyright (c) 2013 by Delphix. All rights reserved.
24 24 * Copyright (c) 2013 by Saso Kiselkov. All rights reserved.
25 25 * Copyright (c) 2013, Joyent, Inc. All rights reserved.
26 + * Copyright (c) 2014, Nexenta Systems, Inc. All rights reserved.
26 27 */
27 28
28 29 #ifdef _KERNEL
29 30 #include <sys/systm.h>
30 31 #else
31 32 #include <errno.h>
32 33 #include <string.h>
33 34 #endif
34 35 #include <sys/debug.h>
35 36 #include <sys/fs/zfs.h>
36 37 #include <sys/inttypes.h>
37 38 #include <sys/types.h>
38 39 #include "zfeature_common.h"
39 40
40 41 /*
41 42 * Set to disable all feature checks while opening pools, allowing pools with
42 43 * unsupported features to be opened. Set for testing only.
43 44 */
44 45 boolean_t zfeature_checks_disable = B_FALSE;
45 46
46 47 zfeature_info_t spa_feature_table[SPA_FEATURES];
47 48
48 49 /*
49 50 * Valid characters for feature guids. This list is mainly for aesthetic
50 51 * purposes and could be expanded in the future. There are different allowed
51 52 * characters in the guids reverse dns portion (before the colon) and its
52 53 * short name (after the colon).
53 54 */
54 55 static int
55 56 valid_char(char c, boolean_t after_colon)
56 57 {
57 58 return ((c >= 'a' && c <= 'z') ||
58 59 (c >= '0' && c <= '9') ||
59 60 c == (after_colon ? '_' : '.'));
60 61 }
61 62
62 63 /*
63 64 * Every feature guid must contain exactly one colon which separates a reverse
64 65 * dns organization name from the feature's "short" name (e.g.
65 66 * "com.company:feature_name").
66 67 */
67 68 boolean_t
68 69 zfeature_is_valid_guid(const char *name)
69 70 {
70 71 int i;
71 72 boolean_t has_colon = B_FALSE;
72 73
73 74 i = 0;
74 75 while (name[i] != '\0') {
75 76 char c = name[i++];
76 77 if (c == ':') {
77 78 if (has_colon)
78 79 return (B_FALSE);
79 80 has_colon = B_TRUE;
80 81 continue;
81 82 }
82 83 if (!valid_char(c, has_colon))
83 84 return (B_FALSE);
84 85 }
85 86
86 87 return (has_colon);
87 88 }
88 89
89 90 boolean_t
90 91 zfeature_is_supported(const char *guid)
91 92 {
92 93 if (zfeature_checks_disable)
93 94 return (B_TRUE);
94 95
95 96 for (spa_feature_t i = 0; i < SPA_FEATURES; i++) {
96 97 zfeature_info_t *feature = &spa_feature_table[i];
97 98 if (strcmp(guid, feature->fi_guid) == 0)
98 99 return (B_TRUE);
99 100 }
100 101 return (B_FALSE);
101 102 }
102 103
103 104 int
104 105 zfeature_lookup_name(const char *name, spa_feature_t *res)
105 106 {
106 107 for (spa_feature_t i = 0; i < SPA_FEATURES; i++) {
107 108 zfeature_info_t *feature = &spa_feature_table[i];
108 109 if (strcmp(name, feature->fi_uname) == 0) {
109 110 if (res != NULL)
110 111 *res = i;
111 112 return (0);
112 113 }
113 114 }
114 115
115 116 return (ENOENT);
116 117 }
117 118
118 119 boolean_t
119 120 zfeature_depends_on(spa_feature_t fid, spa_feature_t check) {
120 121 zfeature_info_t *feature = &spa_feature_table[fid];
121 122
122 123 for (int i = 0; feature->fi_depends[i] != SPA_FEATURE_NONE; i++) {
123 124 if (feature->fi_depends[i] == check)
124 125 return (B_TRUE);
125 126 }
126 127 return (B_FALSE);
127 128 }
128 129
129 130 static void
130 131 zfeature_register(spa_feature_t fid, const char *guid, const char *name,
131 132 const char *desc, boolean_t readonly, boolean_t mos,
132 133 boolean_t activate_on_enable, const spa_feature_t *deps)
133 134 {
134 135 zfeature_info_t *feature = &spa_feature_table[fid];
135 136 static spa_feature_t nodeps[] = { SPA_FEATURE_NONE };
136 137
137 138 ASSERT(name != NULL);
138 139 ASSERT(desc != NULL);
139 140 ASSERT(!readonly || !mos);
140 141 ASSERT3U(fid, <, SPA_FEATURES);
141 142 ASSERT(zfeature_is_valid_guid(guid));
142 143
143 144 if (deps == NULL)
144 145 deps = nodeps;
145 146
146 147 feature->fi_feature = fid;
147 148 feature->fi_guid = guid;
148 149 feature->fi_uname = name;
149 150 feature->fi_desc = desc;
150 151 feature->fi_can_readonly = readonly;
151 152 feature->fi_mos = mos;
152 153 feature->fi_activate_on_enable = activate_on_enable;
153 154 feature->fi_depends = deps;
154 155 }
155 156
156 157 void
157 158 zpool_feature_init(void)
158 159 {
159 160 zfeature_register(SPA_FEATURE_ASYNC_DESTROY,
160 161 "com.delphix:async_destroy", "async_destroy",
161 162 "Destroy filesystems asynchronously.", B_TRUE, B_FALSE,
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162 163 B_FALSE, NULL);
163 164
164 165 zfeature_register(SPA_FEATURE_EMPTY_BPOBJ,
165 166 "com.delphix:empty_bpobj", "empty_bpobj",
166 167 "Snapshots use less space.", B_TRUE, B_FALSE,
167 168 B_FALSE, NULL);
168 169
169 170 zfeature_register(SPA_FEATURE_LZ4_COMPRESS,
170 171 "org.illumos:lz4_compress", "lz4_compress",
171 172 "LZ4 compression algorithm support.", B_FALSE, B_FALSE,
172 - B_FALSE, NULL);
173 + B_TRUE, NULL);
173 174
174 175 zfeature_register(SPA_FEATURE_MULTI_VDEV_CRASH_DUMP,
175 176 "com.joyent:multi_vdev_crash_dump", "multi_vdev_crash_dump",
176 177 "Crash dumps to multiple vdev pools.", B_FALSE, B_FALSE,
177 178 B_FALSE, NULL);
178 179
179 180 zfeature_register(SPA_FEATURE_SPACEMAP_HISTOGRAM,
180 181 "com.delphix:spacemap_histogram", "spacemap_histogram",
181 182 "Spacemaps maintain space histograms.", B_TRUE, B_FALSE,
182 183 B_FALSE, NULL);
183 184
184 185 zfeature_register(SPA_FEATURE_ENABLED_TXG,
185 186 "com.delphix:enabled_txg", "enabled_txg",
186 187 "Record txg at which a feature is enabled", B_TRUE, B_FALSE,
187 188 B_FALSE, NULL);
188 189
189 190 static spa_feature_t hole_birth_deps[] = { SPA_FEATURE_ENABLED_TXG,
190 191 SPA_FEATURE_NONE };
191 192 zfeature_register(SPA_FEATURE_HOLE_BIRTH,
192 193 "com.delphix:hole_birth", "hole_birth",
193 194 "Retain hole birth txg for more precise zfs send",
194 195 B_FALSE, B_TRUE, B_TRUE, hole_birth_deps);
195 196
196 197 zfeature_register(SPA_FEATURE_EXTENSIBLE_DATASET,
197 198 "com.delphix:extensible_dataset", "extensible_dataset",
198 199 "Enhanced dataset functionality, used by other features.",
199 200 B_FALSE, B_FALSE, B_FALSE, NULL);
200 201
201 202 static const spa_feature_t bookmarks_deps[] = {
202 203 SPA_FEATURE_EXTENSIBLE_DATASET,
203 204 SPA_FEATURE_NONE
204 205 };
205 206 zfeature_register(SPA_FEATURE_BOOKMARKS,
206 207 "com.delphix:bookmarks", "bookmarks",
207 208 "\"zfs bookmark\" command",
208 209 B_TRUE, B_FALSE, B_FALSE, bookmarks_deps);
209 210
210 211 static const spa_feature_t filesystem_limits_deps[] = {
211 212 SPA_FEATURE_EXTENSIBLE_DATASET,
212 213 SPA_FEATURE_NONE
213 214 };
214 215 zfeature_register(SPA_FEATURE_FS_SS_LIMIT,
215 216 "com.joyent:filesystem_limits", "filesystem_limits",
216 217 "Filesystem and snapshot limits.", B_TRUE, B_FALSE, B_FALSE,
217 218 filesystem_limits_deps);
218 219 }
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