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); 219 220 zfeature_register(SPA_FEATURE_EMBEDDED_DATA, 221 "com.delphix:embedded_data", "embedded_data", 222 "Blocks which compress very well use even less space.", 223 B_FALSE, B_TRUE, B_TRUE, NULL); 224 } 225