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.
28 #include <sys/systm.h>
33 #include <sys/debug.h>
34 #include <sys/fs/zfs.h>
35 #include <sys/types.h>
36 #include "zfeature_common.h"
39 * Set to disable all feature checks while opening pools, allowing pools with
40 * unsupported features to be opened. Set for testing only.
42 boolean_t zfeature_checks_disable = B_FALSE;
44 zfeature_info_t spa_feature_table[SPA_FEATURES];
47 * Valid characters for feature guids. This list is mainly for aesthetic
48 * purposes and could be expanded in the future. There are different allowed
49 * characters in the guids reverse dns portion (before the colon) and its
50 * short name (after the colon).
53 valid_char(char c, boolean_t after_colon)
55 return ((c >= 'a' && c <= 'z') ||
56 (c >= '0' && c <= '9') ||
57 c == (after_colon ? '_' : '.'));
61 * Every feature guid must contain exactly one colon which separates a reverse
62 * dns organization name from the feature's "short" name (e.g.
63 * "com.company:feature_name").
66 zfeature_is_valid_guid(const char *name)
69 boolean_t has_colon = B_FALSE;
72 while (name[i] != '\0') {
80 if (!valid_char(c, has_colon))
88 zfeature_is_supported(const char *guid)
90 if (zfeature_checks_disable)
93 return (0 == zfeature_lookup_guid(guid, NULL));
97 zfeature_lookup_guid(const char *guid, zfeature_info_t **res)
99 for (int i = 0; i < SPA_FEATURES; i++) {
100 zfeature_info_t *feature = &spa_feature_table[i];
101 if (strcmp(guid, feature->fi_guid) == 0) {
112 zfeature_lookup_name(const char *name, zfeature_info_t **res)
114 for (int i = 0; i < SPA_FEATURES; i++) {
115 zfeature_info_t *feature = &spa_feature_table[i];
116 if (strcmp(name, feature->fi_uname) == 0) {
127 zfeature_register(int fid, const char *guid, const char *name, const char *desc,
128 boolean_t readonly, boolean_t mos, zfeature_info_t **deps)
130 zfeature_info_t *feature = &spa_feature_table[fid];
131 static zfeature_info_t *nodeps[] = { NULL };
133 ASSERT(name != NULL);
134 ASSERT(desc != NULL);
135 ASSERT(!readonly || !mos);
136 ASSERT3U(fid, <, SPA_FEATURES);
137 ASSERT(zfeature_is_valid_guid(guid));
142 feature->fi_guid = guid;
143 feature->fi_uname = name;
144 feature->fi_desc = desc;
145 feature->fi_can_readonly = readonly;
146 feature->fi_mos = mos;
147 feature->fi_depends = deps;
151 zpool_feature_init(void)
153 zfeature_register(SPA_FEATURE_ASYNC_DESTROY,
154 "com.delphix:async_destroy", "async_destroy",
155 "Destroy filesystems asynchronously.", B_TRUE, B_FALSE, NULL);
156 zfeature_register(SPA_FEATURE_EMPTY_BPOBJ,
157 "com.delphix:empty_bpobj", "empty_bpobj",
158 "Snapshots use less space.", B_TRUE, B_FALSE, NULL);
159 zfeature_register(SPA_FEATURE_LZ4_COMPRESS,
160 "org.illumos:lz4_compress", "lz4_compress",
161 "LZ4 compression algorithm support.", B_FALSE, B_FALSE, NULL);