1236884Smm/* 2236884Smm * CDDL HEADER START 3236884Smm * 4236884Smm * The contents of this file are subject to the terms of the 5236884Smm * Common Development and Distribution License (the "License"). 6236884Smm * You may not use this file except in compliance with the License. 7236884Smm * 8236884Smm * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9236884Smm * or http://www.opensolaris.org/os/licensing. 10236884Smm * See the License for the specific language governing permissions 11236884Smm * and limitations under the License. 12236884Smm * 13236884Smm * When distributing Covered Code, include this CDDL HEADER in each 14236884Smm * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15236884Smm * If applicable, add the following below this CDDL HEADER, with the 16236884Smm * fields enclosed by brackets "[]" replaced with your own identifying 17236884Smm * information: Portions Copyright [yyyy] [name of copyright owner] 18236884Smm * 19236884Smm * CDDL HEADER END 20236884Smm */ 21236884Smm 22236884Smm/* 23262093Savg * Copyright (c) 2013 by Delphix. All rights reserved. 24246586Sdelphij * Copyright (c) 2013 by Saso Kiselkov. All rights reserved. 25255750Sdelphij * Copyright (c) 2013, Joyent, Inc. All rights reserved. 26268658Sdelphij * Copyright (c) 2014, Nexenta Systems, Inc. All rights reserved. 27236884Smm */ 28236884Smm 29236884Smm#ifdef _KERNEL 30236884Smm#include <sys/systm.h> 31236884Smm#else 32236884Smm#include <errno.h> 33236884Smm#include <string.h> 34236884Smm#endif 35236884Smm#include <sys/debug.h> 36236884Smm#include <sys/fs/zfs.h> 37236884Smm#include <sys/types.h> 38236884Smm#include "zfeature_common.h" 39236884Smm 40236884Smm/* 41236884Smm * Set to disable all feature checks while opening pools, allowing pools with 42236884Smm * unsupported features to be opened. Set for testing only. 43236884Smm */ 44236884Smmboolean_t zfeature_checks_disable = B_FALSE; 45236884Smm 46236884Smmzfeature_info_t spa_feature_table[SPA_FEATURES]; 47236884Smm 48236884Smm/* 49236884Smm * Valid characters for feature guids. This list is mainly for aesthetic 50236884Smm * purposes and could be expanded in the future. There are different allowed 51236884Smm * characters in the guids reverse dns portion (before the colon) and its 52236884Smm * short name (after the colon). 53236884Smm */ 54236884Smmstatic int 55236884Smmvalid_char(char c, boolean_t after_colon) 56236884Smm{ 57236884Smm return ((c >= 'a' && c <= 'z') || 58236884Smm (c >= '0' && c <= '9') || 59236884Smm c == (after_colon ? '_' : '.')); 60236884Smm} 61236884Smm 62236884Smm/* 63236884Smm * Every feature guid must contain exactly one colon which separates a reverse 64236884Smm * dns organization name from the feature's "short" name (e.g. 65236884Smm * "com.company:feature_name"). 66236884Smm */ 67236884Smmboolean_t 68236884Smmzfeature_is_valid_guid(const char *name) 69236884Smm{ 70236884Smm int i; 71236884Smm boolean_t has_colon = B_FALSE; 72236884Smm 73236884Smm i = 0; 74236884Smm while (name[i] != '\0') { 75236884Smm char c = name[i++]; 76236884Smm if (c == ':') { 77236884Smm if (has_colon) 78236884Smm return (B_FALSE); 79236884Smm has_colon = B_TRUE; 80236884Smm continue; 81236884Smm } 82236884Smm if (!valid_char(c, has_colon)) 83236884Smm return (B_FALSE); 84236884Smm } 85236884Smm 86236884Smm return (has_colon); 87236884Smm} 88236884Smm 89236884Smmboolean_t 90236884Smmzfeature_is_supported(const char *guid) 91236884Smm{ 92236884Smm if (zfeature_checks_disable) 93236884Smm return (B_TRUE); 94236884Smm 95263390Sdelphij for (spa_feature_t i = 0; i < SPA_FEATURES; i++) { 96236884Smm zfeature_info_t *feature = &spa_feature_table[i]; 97263390Sdelphij if (strcmp(guid, feature->fi_guid) == 0) 98263390Sdelphij return (B_TRUE); 99236884Smm } 100263390Sdelphij return (B_FALSE); 101236884Smm} 102236884Smm 103236884Smmint 104263390Sdelphijzfeature_lookup_name(const char *name, spa_feature_t *res) 105236884Smm{ 106263390Sdelphij for (spa_feature_t i = 0; i < SPA_FEATURES; i++) { 107236884Smm zfeature_info_t *feature = &spa_feature_table[i]; 108236884Smm if (strcmp(name, feature->fi_uname) == 0) { 109236884Smm if (res != NULL) 110263390Sdelphij *res = i; 111236884Smm return (0); 112236884Smm } 113236884Smm } 114236884Smm 115236884Smm return (ENOENT); 116236884Smm} 117236884Smm 118263397Sdelphijboolean_t 119263397Sdelphijzfeature_depends_on(spa_feature_t fid, spa_feature_t check) { 120263397Sdelphij zfeature_info_t *feature = &spa_feature_table[fid]; 121263397Sdelphij 122263397Sdelphij for (int i = 0; feature->fi_depends[i] != SPA_FEATURE_NONE; i++) { 123263397Sdelphij if (feature->fi_depends[i] == check) 124263397Sdelphij return (B_TRUE); 125263397Sdelphij } 126263397Sdelphij return (B_FALSE); 127263397Sdelphij} 128263397Sdelphij 129236884Smmstatic void 130263390Sdelphijzfeature_register(spa_feature_t fid, const char *guid, const char *name, 131263390Sdelphij const char *desc, boolean_t readonly, boolean_t mos, 132263397Sdelphij boolean_t activate_on_enable, const spa_feature_t *deps) 133236884Smm{ 134236884Smm zfeature_info_t *feature = &spa_feature_table[fid]; 135263390Sdelphij static spa_feature_t nodeps[] = { SPA_FEATURE_NONE }; 136236884Smm 137236884Smm ASSERT(name != NULL); 138236884Smm ASSERT(desc != NULL); 139236884Smm ASSERT(!readonly || !mos); 140236884Smm ASSERT3U(fid, <, SPA_FEATURES); 141236884Smm ASSERT(zfeature_is_valid_guid(guid)); 142236884Smm 143236884Smm if (deps == NULL) 144236884Smm deps = nodeps; 145236884Smm 146263390Sdelphij feature->fi_feature = fid; 147236884Smm feature->fi_guid = guid; 148236884Smm feature->fi_uname = name; 149236884Smm feature->fi_desc = desc; 150236884Smm feature->fi_can_readonly = readonly; 151236884Smm feature->fi_mos = mos; 152263397Sdelphij feature->fi_activate_on_enable = activate_on_enable; 153236884Smm feature->fi_depends = deps; 154236884Smm} 155236884Smm 156236884Smmvoid 157236884Smmzpool_feature_init(void) 158236884Smm{ 159236884Smm zfeature_register(SPA_FEATURE_ASYNC_DESTROY, 160236884Smm "com.delphix:async_destroy", "async_destroy", 161263397Sdelphij "Destroy filesystems asynchronously.", B_TRUE, B_FALSE, 162263397Sdelphij B_FALSE, NULL); 163263397Sdelphij 164239774Smm zfeature_register(SPA_FEATURE_EMPTY_BPOBJ, 165239774Smm "com.delphix:empty_bpobj", "empty_bpobj", 166263397Sdelphij "Snapshots use less space.", B_TRUE, B_FALSE, 167263397Sdelphij B_FALSE, NULL); 168263397Sdelphij 169246586Sdelphij zfeature_register(SPA_FEATURE_LZ4_COMPRESS, 170246586Sdelphij "org.illumos:lz4_compress", "lz4_compress", 171263397Sdelphij "LZ4 compression algorithm support.", B_FALSE, B_FALSE, 172268658Sdelphij B_TRUE, NULL); 173263397Sdelphij 174255750Sdelphij zfeature_register(SPA_FEATURE_MULTI_VDEV_CRASH_DUMP, 175255750Sdelphij "com.joyent:multi_vdev_crash_dump", "multi_vdev_crash_dump", 176263397Sdelphij "Crash dumps to multiple vdev pools.", B_FALSE, B_FALSE, 177263397Sdelphij B_FALSE, NULL); 178263397Sdelphij 179262093Savg zfeature_register(SPA_FEATURE_SPACEMAP_HISTOGRAM, 180262093Savg "com.delphix:spacemap_histogram", "spacemap_histogram", 181263397Sdelphij "Spacemaps maintain space histograms.", B_TRUE, B_FALSE, 182263397Sdelphij B_FALSE, NULL); 183263397Sdelphij 184263397Sdelphij zfeature_register(SPA_FEATURE_ENABLED_TXG, 185263397Sdelphij "com.delphix:enabled_txg", "enabled_txg", 186263397Sdelphij "Record txg at which a feature is enabled", B_TRUE, B_FALSE, 187263397Sdelphij B_FALSE, NULL); 188263397Sdelphij 189263397Sdelphij static spa_feature_t hole_birth_deps[] = { SPA_FEATURE_ENABLED_TXG, 190263397Sdelphij SPA_FEATURE_NONE }; 191263397Sdelphij zfeature_register(SPA_FEATURE_HOLE_BIRTH, 192263397Sdelphij "com.delphix:hole_birth", "hole_birth", 193263397Sdelphij "Retain hole birth txg for more precise zfs send", 194263397Sdelphij B_FALSE, B_TRUE, B_TRUE, hole_birth_deps); 195263397Sdelphij 196263390Sdelphij zfeature_register(SPA_FEATURE_EXTENSIBLE_DATASET, 197263390Sdelphij "com.delphix:extensible_dataset", "extensible_dataset", 198263390Sdelphij "Enhanced dataset functionality, used by other features.", 199263397Sdelphij B_FALSE, B_FALSE, B_FALSE, NULL); 200263407Sdelphij 201263407Sdelphij static const spa_feature_t bookmarks_deps[] = { 202263407Sdelphij SPA_FEATURE_EXTENSIBLE_DATASET, 203263407Sdelphij SPA_FEATURE_NONE 204263407Sdelphij }; 205263407Sdelphij zfeature_register(SPA_FEATURE_BOOKMARKS, 206263407Sdelphij "com.delphix:bookmarks", "bookmarks", 207263407Sdelphij "\"zfs bookmark\" command", 208263407Sdelphij B_TRUE, B_FALSE, B_FALSE, bookmarks_deps); 209265744Sdelphij 210265744Sdelphij static const spa_feature_t filesystem_limits_deps[] = { 211265744Sdelphij SPA_FEATURE_EXTENSIBLE_DATASET, 212265744Sdelphij SPA_FEATURE_NONE 213265744Sdelphij }; 214265744Sdelphij zfeature_register(SPA_FEATURE_FS_SS_LIMIT, 215265744Sdelphij "com.joyent:filesystem_limits", "filesystem_limits", 216265744Sdelphij "Filesystem and snapshot limits.", B_TRUE, B_FALSE, B_FALSE, 217265744Sdelphij filesystem_limits_deps); 218268649Sdelphij 219268649Sdelphij zfeature_register(SPA_FEATURE_EMBEDDED_DATA, 220268649Sdelphij "com.delphix:embedded_data", "embedded_data", 221268649Sdelphij "Blocks which compress very well use even less space.", 222268649Sdelphij B_FALSE, B_TRUE, B_TRUE, NULL); 223236884Smm} 224