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.
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.
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]
23 * Copyright (c) 2012 by Delphix. All rights reserved.
24 * Copyright (c) 2013 by Saso Kiselkov. All rights reserved.
25 * Copyright (c) 2013, Joyent, Inc. All rights reserved.
29 #include <sys/systm.h>
34 #include <sys/debug.h>
35 #include <sys/fs/zfs.h>
36 #include <sys/types.h>
37 #include "zfeature_common.h"
40 * Set to disable all feature checks while opening pools, allowing pools with
41 * unsupported features to be opened. Set for testing only.
43 boolean_t zfeature_checks_disable = B_FALSE;
45 zfeature_info_t spa_feature_table[SPA_FEATURES];
48 * Valid characters for feature guids. This list is mainly for aesthetic
49 * purposes and could be expanded in the future. There are different allowed
50 * characters in the guids reverse dns portion (before the colon) and its
51 * short name (after the colon).
54 valid_char(char c, boolean_t after_colon)
56 return ((c >= 'a' && c <= 'z') ||
57 (c >= '0' && c <= '9') ||
58 c == (after_colon ? '_' : '.'));
62 * Every feature guid must contain exactly one colon which separates a reverse
63 * dns organization name from the feature's "short" name (e.g.
64 * "com.company:feature_name").
67 zfeature_is_valid_guid(const char *name)
70 boolean_t has_colon = B_FALSE;
73 while (name[i] != '\0') {
81 if (!valid_char(c, has_colon))
89 zfeature_is_supported(const char *guid)
91 if (zfeature_checks_disable)
94 return (0 == zfeature_lookup_guid(guid, NULL));
98 zfeature_lookup_guid(const char *guid, zfeature_info_t **res)
100 for (int i = 0; i < SPA_FEATURES; i++) {
101 zfeature_info_t *feature = &spa_feature_table[i];
102 if (strcmp(guid, feature->fi_guid) == 0) {
113 zfeature_lookup_name(const char *name, zfeature_info_t **res)
115 for (int i = 0; i < SPA_FEATURES; i++) {
116 zfeature_info_t *feature = &spa_feature_table[i];
117 if (strcmp(name, feature->fi_uname) == 0) {
128 zfeature_register(int fid, const char *guid, const char *name, const char *desc,
129 boolean_t readonly, boolean_t mos, zfeature_info_t **deps)
131 zfeature_info_t *feature = &spa_feature_table[fid];
132 static zfeature_info_t *nodeps[] = { NULL };
134 ASSERT(name != NULL);
135 ASSERT(desc != NULL);
136 ASSERT(!readonly || !mos);
137 ASSERT3U(fid, <, SPA_FEATURES);
138 ASSERT(zfeature_is_valid_guid(guid));
143 feature->fi_guid = guid;
144 feature->fi_uname = name;
145 feature->fi_desc = desc;
146 feature->fi_can_readonly = readonly;
147 feature->fi_mos = mos;
148 feature->fi_depends = deps;
152 zpool_feature_init(void)
154 zfeature_register(SPA_FEATURE_ASYNC_DESTROY,
155 "com.delphix:async_destroy", "async_destroy",
156 "Destroy filesystems asynchronously.", B_TRUE, B_FALSE, NULL);
157 zfeature_register(SPA_FEATURE_EMPTY_BPOBJ,
158 "com.delphix:empty_bpobj", "empty_bpobj",
159 "Snapshots use less space.", B_TRUE, B_FALSE, NULL);
160 zfeature_register(SPA_FEATURE_LZ4_COMPRESS,
161 "org.illumos:lz4_compress", "lz4_compress",
162 "LZ4 compression algorithm support.", B_FALSE, B_FALSE, NULL);
163 zfeature_register(SPA_FEATURE_MULTI_VDEV_CRASH_DUMP,
164 "com.joyent:multi_vdev_crash_dump", "multi_vdev_crash_dump",
165 "Crash dumps to multiple vdev pools.", B_FALSE, B_FALSE, NULL);