zfeature_common.c revision 288572
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/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 */ 44boolean_t zfeature_checks_disable = B_FALSE; 45 46zfeature_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 */ 54static int 55valid_char(char c, boolean_t after_colon) 56{ 57 return ((c >= 'a' && c <= 'z') || 58 (c >= '0' && c <= '9') || 59 (after_colon && c == '_') || 60 (!after_colon && (c == '.' || c == '-'))); 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 */ 68boolean_t 69zfeature_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 90boolean_t 91zfeature_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 104int 105zfeature_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 119boolean_t 120zfeature_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 130static void 131zfeature_register(spa_feature_t fid, const char *guid, const char *name, 132 const char *desc, zfeature_flags_t flags, 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((flags & ZFEATURE_FLAG_READONLY_COMPAT) == 0 || 140 (flags & ZFEATURE_FLAG_MOS) == 0); 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_flags = flags; 152 feature->fi_depends = deps; 153} 154 155void 156zpool_feature_init(void) 157{ 158 zfeature_register(SPA_FEATURE_ASYNC_DESTROY, 159 "com.delphix:async_destroy", "async_destroy", 160 "Destroy filesystems asynchronously.", 161 ZFEATURE_FLAG_READONLY_COMPAT, NULL); 162 163 zfeature_register(SPA_FEATURE_EMPTY_BPOBJ, 164 "com.delphix:empty_bpobj", "empty_bpobj", 165 "Snapshots use less space.", 166 ZFEATURE_FLAG_READONLY_COMPAT, NULL); 167 168 zfeature_register(SPA_FEATURE_LZ4_COMPRESS, 169 "org.illumos:lz4_compress", "lz4_compress", 170 "LZ4 compression algorithm support.", 171 ZFEATURE_FLAG_ACTIVATE_ON_ENABLE, NULL); 172 173 zfeature_register(SPA_FEATURE_MULTI_VDEV_CRASH_DUMP, 174 "com.joyent:multi_vdev_crash_dump", "multi_vdev_crash_dump", 175 "Crash dumps to multiple vdev pools.", 176 0, NULL); 177 178 zfeature_register(SPA_FEATURE_SPACEMAP_HISTOGRAM, 179 "com.delphix:spacemap_histogram", "spacemap_histogram", 180 "Spacemaps maintain space histograms.", 181 ZFEATURE_FLAG_READONLY_COMPAT, NULL); 182 183 zfeature_register(SPA_FEATURE_ENABLED_TXG, 184 "com.delphix:enabled_txg", "enabled_txg", 185 "Record txg at which a feature is enabled", 186 ZFEATURE_FLAG_READONLY_COMPAT, NULL); 187 188 static spa_feature_t hole_birth_deps[] = { SPA_FEATURE_ENABLED_TXG, 189 SPA_FEATURE_NONE }; 190 zfeature_register(SPA_FEATURE_HOLE_BIRTH, 191 "com.delphix:hole_birth", "hole_birth", 192 "Retain hole birth txg for more precise zfs send", 193 ZFEATURE_FLAG_MOS | ZFEATURE_FLAG_ACTIVATE_ON_ENABLE, 194 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 0, NULL); 200 201 static const spa_feature_t bookmarks_deps[] = { 202 SPA_FEATURE_EXTENSIBLE_DATASET, 203 SPA_FEATURE_NONE 204 }; 205 zfeature_register(SPA_FEATURE_BOOKMARKS, 206 "com.delphix:bookmarks", "bookmarks", 207 "\"zfs bookmark\" command", 208 ZFEATURE_FLAG_READONLY_COMPAT, bookmarks_deps); 209 210 static const spa_feature_t filesystem_limits_deps[] = { 211 SPA_FEATURE_EXTENSIBLE_DATASET, 212 SPA_FEATURE_NONE 213 }; 214 zfeature_register(SPA_FEATURE_FS_SS_LIMIT, 215 "com.joyent:filesystem_limits", "filesystem_limits", 216 "Filesystem and snapshot limits.", 217 ZFEATURE_FLAG_READONLY_COMPAT, filesystem_limits_deps); 218 219 zfeature_register(SPA_FEATURE_EMBEDDED_DATA, 220 "com.delphix:embedded_data", "embedded_data", 221 "Blocks which compress very well use even less space.", 222 ZFEATURE_FLAG_MOS | ZFEATURE_FLAG_ACTIVATE_ON_ENABLE, 223 NULL); 224 225 static const spa_feature_t large_blocks_deps[] = { 226 SPA_FEATURE_EXTENSIBLE_DATASET, 227 SPA_FEATURE_NONE 228 }; 229 zfeature_register(SPA_FEATURE_LARGE_BLOCKS, 230 "org.open-zfs:large_blocks", "large_blocks", 231 "Support for blocks larger than 128KB.", 232 ZFEATURE_FLAG_PER_DATASET, large_blocks_deps); 233} 234