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 */ 27 28 #ifdef _KERNEL 29 #include <sys/systm.h> 30 #else 31 #include <errno.h> 32 #include <string.h> 33 #endif 34 #include <sys/debug.h> 35 #include <sys/fs/zfs.h> 36 #include <sys/inttypes.h> 37 #include <sys/types.h> 38 #include "zfeature_common.h" 39 40 /* 41 * Set to disable all feature checks while opening pools, allowing pools with 42 * unsupported features to be opened. Set for testing only. 43 */ 44 boolean_t zfeature_checks_disable = B_FALSE; 45 46 zfeature_info_t spa_feature_table[SPA_FEATURES]; 47 48 /* 49 * Valid characters for feature guids. This list is mainly for aesthetic 50 * purposes and could be expanded in the future. There are different allowed 51 * characters in the guids reverse dns portion (before the colon) and its 52 * short name (after the colon). 53 */ 54 static int 55 valid_char(char c, boolean_t after_colon) 56 { 57 return ((c >= 'a' && c <= 'z') || 58 (c >= '0' && c <= '9') || 59 c == (after_colon ? '_' : '.')); 60 } 61 62 /* 63 * Every feature guid must contain exactly one colon which separates a reverse 64 * dns organization name from the feature's "short" name (e.g. 65 * "com.company:feature_name"). 66 */ 67 boolean_t 68 zfeature_is_valid_guid(const char *name) 69 { 70 int i; 71 boolean_t has_colon = B_FALSE; 72 73 i = 0; 74 while (name[i] != '\0') { 75 char c = name[i++]; 76 if (c == ':') { 77 if (has_colon) 78 return (B_FALSE); 79 has_colon = B_TRUE; 80 continue; 81 } 82 if (!valid_char(c, has_colon)) 83 return (B_FALSE); 84 } 85 86 return (has_colon); 87 } 88 89 boolean_t 90 zfeature_is_supported(const char *guid) 91 { 92 if (zfeature_checks_disable) 93 return (B_TRUE); 94 95 for (spa_feature_t i = 0; i < SPA_FEATURES; i++) { 96 zfeature_info_t *feature = &spa_feature_table[i]; 97 if (strcmp(guid, feature->fi_guid) == 0) 98 return (B_TRUE); 99 } 100 return (B_FALSE); 101 } 102 103 int 104 zfeature_lookup_name(const char *name, spa_feature_t *res) 105 { 106 for (spa_feature_t i = 0; i < SPA_FEATURES; i++) { 107 zfeature_info_t *feature = &spa_feature_table[i]; 108 if (strcmp(name, feature->fi_uname) == 0) { 109 if (res != NULL) 110 *res = i; 111 return (0); 112 } 113 } 114 115 return (ENOENT); 116 } 117 118 boolean_t 119 zfeature_depends_on(spa_feature_t fid, spa_feature_t check) { 120 zfeature_info_t *feature = &spa_feature_table[fid]; 121 122 for (int i = 0; feature->fi_depends[i] != SPA_FEATURE_NONE; i++) { 123 if (feature->fi_depends[i] == check) 124 return (B_TRUE); 125 } 126 return (B_FALSE); 127 } 128 129 static void 130 zfeature_register(spa_feature_t fid, const char *guid, const char *name, 131 const char *desc, boolean_t readonly, boolean_t mos, 132 boolean_t activate_on_enable, const spa_feature_t *deps) 133 { 134 zfeature_info_t *feature = &spa_feature_table[fid]; 135 static spa_feature_t nodeps[] = { SPA_FEATURE_NONE }; 136 137 ASSERT(name != NULL); 138 ASSERT(desc != NULL); 139 ASSERT(!readonly || !mos); 140 ASSERT3U(fid, <, SPA_FEATURES); 141 ASSERT(zfeature_is_valid_guid(guid)); 142 143 if (deps == NULL) 144 deps = nodeps; 145 146 feature->fi_feature = fid; 147 feature->fi_guid = guid; 148 feature->fi_uname = name; 149 feature->fi_desc = desc; 150 feature->fi_can_readonly = readonly; 151 feature->fi_mos = mos; 152 feature->fi_activate_on_enable = activate_on_enable; 153 feature->fi_depends = deps; 154 } 155 156 void 157 zpool_feature_init(void) 158 { 159 zfeature_register(SPA_FEATURE_ASYNC_DESTROY, 160 "com.delphix:async_destroy", "async_destroy", 161 "Destroy filesystems asynchronously.", B_TRUE, B_FALSE, 162 B_FALSE, NULL); 163 164 zfeature_register(SPA_FEATURE_EMPTY_BPOBJ, 165 "com.delphix:empty_bpobj", "empty_bpobj", 166 "Snapshots use less space.", B_TRUE, B_FALSE, 167 B_FALSE, NULL); 168 169 zfeature_register(SPA_FEATURE_LZ4_COMPRESS, 170 "org.illumos:lz4_compress", "lz4_compress", 171 "LZ4 compression algorithm support.", B_FALSE, B_FALSE, 172 B_FALSE, NULL); 173 174 zfeature_register(SPA_FEATURE_MULTI_VDEV_CRASH_DUMP, 175 "com.joyent:multi_vdev_crash_dump", "multi_vdev_crash_dump", 176 "Crash dumps to multiple vdev pools.", B_FALSE, B_FALSE, 177 B_FALSE, NULL); 178 179 zfeature_register(SPA_FEATURE_SPACEMAP_HISTOGRAM, 180 "com.delphix:spacemap_histogram", "spacemap_histogram", 181 "Spacemaps maintain space histograms.", B_TRUE, B_FALSE, 182 B_FALSE, NULL); 183 184 zfeature_register(SPA_FEATURE_ENABLED_TXG, 185 "com.delphix:enabled_txg", "enabled_txg", 186 "Record txg at which a feature is enabled", B_TRUE, B_FALSE, 187 B_FALSE, NULL); 188 189 static spa_feature_t hole_birth_deps[] = { SPA_FEATURE_ENABLED_TXG, 190 SPA_FEATURE_NONE }; 191 zfeature_register(SPA_FEATURE_HOLE_BIRTH, 192 "com.delphix:hole_birth", "hole_birth", 193 "Retain hole birth txg for more precise zfs send", 194 B_FALSE, B_TRUE, B_TRUE, hole_birth_deps); 195 196 zfeature_register(SPA_FEATURE_EXTENSIBLE_DATASET, 197 "com.delphix:extensible_dataset", "extensible_dataset", 198 "Enhanced dataset functionality, used by other features.", 199 B_FALSE, B_FALSE, B_FALSE, NULL); 200 } 201