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/* 23262094Savg * Copyright (c) 2013 by Delphix. All rights reserved. 24247309Sdelphij * Copyright (c) 2013 by Saso Kiselkov. All rights reserved. 25262089Savg * Copyright (c) 2013, Joyent, Inc. All rights reserved. 26236884Smm */ 27236884Smm 28236884Smm#ifdef _KERNEL 29236884Smm#include <sys/systm.h> 30236884Smm#else 31236884Smm#include <errno.h> 32236884Smm#include <string.h> 33236884Smm#endif 34236884Smm#include <sys/debug.h> 35236884Smm#include <sys/fs/zfs.h> 36236884Smm#include <sys/types.h> 37236884Smm#include "zfeature_common.h" 38236884Smm 39236884Smm/* 40236884Smm * Set to disable all feature checks while opening pools, allowing pools with 41236884Smm * unsupported features to be opened. Set for testing only. 42236884Smm */ 43236884Smmboolean_t zfeature_checks_disable = B_FALSE; 44236884Smm 45236884Smmzfeature_info_t spa_feature_table[SPA_FEATURES]; 46236884Smm 47236884Smm/* 48236884Smm * Valid characters for feature guids. This list is mainly for aesthetic 49236884Smm * purposes and could be expanded in the future. There are different allowed 50236884Smm * characters in the guids reverse dns portion (before the colon) and its 51236884Smm * short name (after the colon). 52236884Smm */ 53236884Smmstatic int 54236884Smmvalid_char(char c, boolean_t after_colon) 55236884Smm{ 56236884Smm return ((c >= 'a' && c <= 'z') || 57236884Smm (c >= '0' && c <= '9') || 58236884Smm c == (after_colon ? '_' : '.')); 59236884Smm} 60236884Smm 61236884Smm/* 62236884Smm * Every feature guid must contain exactly one colon which separates a reverse 63236884Smm * dns organization name from the feature's "short" name (e.g. 64236884Smm * "com.company:feature_name"). 65236884Smm */ 66236884Smmboolean_t 67236884Smmzfeature_is_valid_guid(const char *name) 68236884Smm{ 69236884Smm int i; 70236884Smm boolean_t has_colon = B_FALSE; 71236884Smm 72236884Smm i = 0; 73236884Smm while (name[i] != '\0') { 74236884Smm char c = name[i++]; 75236884Smm if (c == ':') { 76236884Smm if (has_colon) 77236884Smm return (B_FALSE); 78236884Smm has_colon = B_TRUE; 79236884Smm continue; 80236884Smm } 81236884Smm if (!valid_char(c, has_colon)) 82236884Smm return (B_FALSE); 83236884Smm } 84236884Smm 85236884Smm return (has_colon); 86236884Smm} 87236884Smm 88236884Smmboolean_t 89236884Smmzfeature_is_supported(const char *guid) 90236884Smm{ 91236884Smm if (zfeature_checks_disable) 92236884Smm return (B_TRUE); 93236884Smm 94263391Sdelphij for (spa_feature_t i = 0; i < SPA_FEATURES; i++) { 95236884Smm zfeature_info_t *feature = &spa_feature_table[i]; 96263391Sdelphij if (strcmp(guid, feature->fi_guid) == 0) 97263391Sdelphij return (B_TRUE); 98236884Smm } 99263391Sdelphij return (B_FALSE); 100236884Smm} 101236884Smm 102236884Smmint 103263391Sdelphijzfeature_lookup_name(const char *name, spa_feature_t *res) 104236884Smm{ 105263391Sdelphij for (spa_feature_t i = 0; i < SPA_FEATURES; i++) { 106236884Smm zfeature_info_t *feature = &spa_feature_table[i]; 107236884Smm if (strcmp(name, feature->fi_uname) == 0) { 108236884Smm if (res != NULL) 109263391Sdelphij *res = i; 110236884Smm return (0); 111236884Smm } 112236884Smm } 113236884Smm 114236884Smm return (ENOENT); 115236884Smm} 116236884Smm 117263398Sdelphijboolean_t 118263398Sdelphijzfeature_depends_on(spa_feature_t fid, spa_feature_t check) { 119263398Sdelphij zfeature_info_t *feature = &spa_feature_table[fid]; 120263398Sdelphij 121263398Sdelphij for (int i = 0; feature->fi_depends[i] != SPA_FEATURE_NONE; i++) { 122263398Sdelphij if (feature->fi_depends[i] == check) 123263398Sdelphij return (B_TRUE); 124263398Sdelphij } 125263398Sdelphij return (B_FALSE); 126263398Sdelphij} 127263398Sdelphij 128236884Smmstatic void 129263391Sdelphijzfeature_register(spa_feature_t fid, const char *guid, const char *name, 130263391Sdelphij const char *desc, boolean_t readonly, boolean_t mos, 131263398Sdelphij boolean_t activate_on_enable, const spa_feature_t *deps) 132236884Smm{ 133236884Smm zfeature_info_t *feature = &spa_feature_table[fid]; 134263391Sdelphij static spa_feature_t nodeps[] = { SPA_FEATURE_NONE }; 135236884Smm 136236884Smm ASSERT(name != NULL); 137236884Smm ASSERT(desc != NULL); 138236884Smm ASSERT(!readonly || !mos); 139236884Smm ASSERT3U(fid, <, SPA_FEATURES); 140236884Smm ASSERT(zfeature_is_valid_guid(guid)); 141236884Smm 142236884Smm if (deps == NULL) 143236884Smm deps = nodeps; 144236884Smm 145263391Sdelphij feature->fi_feature = fid; 146236884Smm feature->fi_guid = guid; 147236884Smm feature->fi_uname = name; 148236884Smm feature->fi_desc = desc; 149236884Smm feature->fi_can_readonly = readonly; 150236884Smm feature->fi_mos = mos; 151263398Sdelphij feature->fi_activate_on_enable = activate_on_enable; 152236884Smm feature->fi_depends = deps; 153236884Smm} 154236884Smm 155236884Smmvoid 156236884Smmzpool_feature_init(void) 157236884Smm{ 158236884Smm zfeature_register(SPA_FEATURE_ASYNC_DESTROY, 159236884Smm "com.delphix:async_destroy", "async_destroy", 160263398Sdelphij "Destroy filesystems asynchronously.", B_TRUE, B_FALSE, 161263398Sdelphij B_FALSE, NULL); 162263398Sdelphij 163243674Smm zfeature_register(SPA_FEATURE_EMPTY_BPOBJ, 164243674Smm "com.delphix:empty_bpobj", "empty_bpobj", 165263398Sdelphij "Snapshots use less space.", B_TRUE, B_FALSE, 166263398Sdelphij B_FALSE, NULL); 167263398Sdelphij 168247309Sdelphij zfeature_register(SPA_FEATURE_LZ4_COMPRESS, 169247309Sdelphij "org.illumos:lz4_compress", "lz4_compress", 170263398Sdelphij "LZ4 compression algorithm support.", B_FALSE, B_FALSE, 171263398Sdelphij B_FALSE, NULL); 172263398Sdelphij 173262089Savg zfeature_register(SPA_FEATURE_MULTI_VDEV_CRASH_DUMP, 174262089Savg "com.joyent:multi_vdev_crash_dump", "multi_vdev_crash_dump", 175263398Sdelphij "Crash dumps to multiple vdev pools.", B_FALSE, B_FALSE, 176263398Sdelphij B_FALSE, NULL); 177263398Sdelphij 178262094Savg zfeature_register(SPA_FEATURE_SPACEMAP_HISTOGRAM, 179262094Savg "com.delphix:spacemap_histogram", "spacemap_histogram", 180263398Sdelphij "Spacemaps maintain space histograms.", B_TRUE, B_FALSE, 181263398Sdelphij B_FALSE, NULL); 182263398Sdelphij 183263398Sdelphij zfeature_register(SPA_FEATURE_ENABLED_TXG, 184263398Sdelphij "com.delphix:enabled_txg", "enabled_txg", 185263398Sdelphij "Record txg at which a feature is enabled", B_TRUE, B_FALSE, 186263398Sdelphij B_FALSE, NULL); 187263398Sdelphij 188263398Sdelphij static spa_feature_t hole_birth_deps[] = { SPA_FEATURE_ENABLED_TXG, 189263398Sdelphij SPA_FEATURE_NONE }; 190263398Sdelphij zfeature_register(SPA_FEATURE_HOLE_BIRTH, 191263398Sdelphij "com.delphix:hole_birth", "hole_birth", 192263398Sdelphij "Retain hole birth txg for more precise zfs send", 193263398Sdelphij B_FALSE, B_TRUE, B_TRUE, hole_birth_deps); 194263398Sdelphij 195263391Sdelphij zfeature_register(SPA_FEATURE_EXTENSIBLE_DATASET, 196263391Sdelphij "com.delphix:extensible_dataset", "extensible_dataset", 197263391Sdelphij "Enhanced dataset functionality, used by other features.", 198263398Sdelphij B_FALSE, B_FALSE, B_FALSE, NULL); 199263410Sdelphij 200263410Sdelphij static const spa_feature_t bookmarks_deps[] = { 201263410Sdelphij SPA_FEATURE_EXTENSIBLE_DATASET, 202263410Sdelphij SPA_FEATURE_NONE 203263410Sdelphij }; 204263410Sdelphij zfeature_register(SPA_FEATURE_BOOKMARKS, 205263410Sdelphij "com.delphix:bookmarks", "bookmarks", 206263410Sdelphij "\"zfs bookmark\" command", 207263410Sdelphij B_TRUE, B_FALSE, B_FALSE, bookmarks_deps); 208265754Sdelphij 209265754Sdelphij static const spa_feature_t filesystem_limits_deps[] = { 210265754Sdelphij SPA_FEATURE_EXTENSIBLE_DATASET, 211265754Sdelphij SPA_FEATURE_NONE 212265754Sdelphij }; 213265754Sdelphij zfeature_register(SPA_FEATURE_FS_SS_LIMIT, 214265754Sdelphij "com.joyent:filesystem_limits", "filesystem_limits", 215265754Sdelphij "Filesystem and snapshot limits.", B_TRUE, B_FALSE, B_FALSE, 216265754Sdelphij filesystem_limits_deps); 217236884Smm} 218