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) 2011, 2015 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 (after_colon && c == '_') || 61 (!after_colon && (c == '.' || c == '-'))); 62 } 63 64 /* 65 * Every feature guid must contain exactly one colon which separates a reverse 66 * dns organization name from the feature's "short" name (e.g. 67 * "com.company:feature_name"). 68 */ 69 boolean_t 70 zfeature_is_valid_guid(const char *name) 71 { 72 int i; 73 boolean_t has_colon = B_FALSE; 74 75 i = 0; 76 while (name[i] != '\0') { 77 char c = name[i++]; 78 if (c == ':') { 79 if (has_colon) 80 return (B_FALSE); 81 has_colon = B_TRUE; 82 continue; 83 } 84 if (!valid_char(c, has_colon)) 85 return (B_FALSE); 86 } 87 88 return (has_colon); 89 } 90 91 boolean_t 92 zfeature_is_supported(const char *guid) 93 { 94 if (zfeature_checks_disable) 95 return (B_TRUE); 96 97 for (spa_feature_t i = 0; i < SPA_FEATURES; i++) { 98 zfeature_info_t *feature = &spa_feature_table[i]; 99 if (strcmp(guid, feature->fi_guid) == 0) 100 return (B_TRUE); 101 } 102 return (B_FALSE); 103 } 104 105 int 106 zfeature_lookup_name(const char *name, spa_feature_t *res) 107 { 108 for (spa_feature_t i = 0; i < SPA_FEATURES; i++) { 109 zfeature_info_t *feature = &spa_feature_table[i]; 110 if (strcmp(name, feature->fi_uname) == 0) { 111 if (res != NULL) 112 *res = i; 113 return (0); 114 } 115 } 116 117 return (ENOENT); 118 } 119 120 boolean_t 121 zfeature_depends_on(spa_feature_t fid, spa_feature_t check) { 122 zfeature_info_t *feature = &spa_feature_table[fid]; 123 124 for (int i = 0; feature->fi_depends[i] != SPA_FEATURE_NONE; i++) { 125 if (feature->fi_depends[i] == check) 126 return (B_TRUE); 127 } 128 return (B_FALSE); 129 } 130 131 static void 132 zfeature_register(spa_feature_t fid, const char *guid, const char *name, 133 const char *desc, zfeature_flags_t flags, 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((flags & ZFEATURE_FLAG_READONLY_COMPAT) == 0 || 141 (flags & ZFEATURE_FLAG_MOS) == 0); 142 ASSERT3U(fid, <, SPA_FEATURES); 143 ASSERT(zfeature_is_valid_guid(guid)); 144 145 if (deps == NULL) 146 deps = nodeps; 147 148 feature->fi_feature = fid; 149 feature->fi_guid = guid; 150 feature->fi_uname = name; 151 feature->fi_desc = desc; 152 feature->fi_flags = flags; 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.", 162 ZFEATURE_FLAG_READONLY_COMPAT, NULL); 163 164 zfeature_register(SPA_FEATURE_EMPTY_BPOBJ, 165 "com.delphix:empty_bpobj", "empty_bpobj", 166 "Snapshots use less space.", 167 ZFEATURE_FLAG_READONLY_COMPAT, NULL); 168 169 zfeature_register(SPA_FEATURE_LZ4_COMPRESS, 170 "org.illumos:lz4_compress", "lz4_compress", 171 "LZ4 compression algorithm support.", 172 ZFEATURE_FLAG_ACTIVATE_ON_ENABLE, 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.", 177 0, NULL); 178 179 zfeature_register(SPA_FEATURE_SPACEMAP_HISTOGRAM, 180 "com.delphix:spacemap_histogram", "spacemap_histogram", 181 "Spacemaps maintain space histograms.", 182 ZFEATURE_FLAG_READONLY_COMPAT, 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", 187 ZFEATURE_FLAG_READONLY_COMPAT, 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 ZFEATURE_FLAG_MOS | ZFEATURE_FLAG_ACTIVATE_ON_ENABLE, 195 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 0, 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 ZFEATURE_FLAG_READONLY_COMPAT, 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.", 218 ZFEATURE_FLAG_READONLY_COMPAT, 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 ZFEATURE_FLAG_MOS | ZFEATURE_FLAG_ACTIVATE_ON_ENABLE, 224 NULL); 225 226 static const spa_feature_t large_blocks_deps[] = { 227 SPA_FEATURE_EXTENSIBLE_DATASET, 228 SPA_FEATURE_NONE 229 }; 230 zfeature_register(SPA_FEATURE_LARGE_BLOCKS, 231 "org.open-zfs:large_blocks", "large_blocks", 232 "Support for blocks larger than 128KB.", 233 ZFEATURE_FLAG_PER_DATASET, large_blocks_deps); 234 } 235