zfeature_common.c revision 263390
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 */ 27 28#ifdef _KERNEL 29#include <sys/systm.h> 30#else 31#include <errno.h> 32#include <string.h> 33#endif 34#include <sys/debug.h> 35#include <sys/fs/zfs.h> 36#include <sys/types.h> 37#include "zfeature_common.h" 38 39/* 40 * Set to disable all feature checks while opening pools, allowing pools with 41 * unsupported features to be opened. Set for testing only. 42 */ 43boolean_t zfeature_checks_disable = B_FALSE; 44 45zfeature_info_t spa_feature_table[SPA_FEATURES]; 46 47/* 48 * Valid characters for feature guids. This list is mainly for aesthetic 49 * purposes and could be expanded in the future. There are different allowed 50 * characters in the guids reverse dns portion (before the colon) and its 51 * short name (after the colon). 52 */ 53static int 54valid_char(char c, boolean_t after_colon) 55{ 56 return ((c >= 'a' && c <= 'z') || 57 (c >= '0' && c <= '9') || 58 c == (after_colon ? '_' : '.')); 59} 60 61/* 62 * Every feature guid must contain exactly one colon which separates a reverse 63 * dns organization name from the feature's "short" name (e.g. 64 * "com.company:feature_name"). 65 */ 66boolean_t 67zfeature_is_valid_guid(const char *name) 68{ 69 int i; 70 boolean_t has_colon = B_FALSE; 71 72 i = 0; 73 while (name[i] != '\0') { 74 char c = name[i++]; 75 if (c == ':') { 76 if (has_colon) 77 return (B_FALSE); 78 has_colon = B_TRUE; 79 continue; 80 } 81 if (!valid_char(c, has_colon)) 82 return (B_FALSE); 83 } 84 85 return (has_colon); 86} 87 88boolean_t 89zfeature_is_supported(const char *guid) 90{ 91 if (zfeature_checks_disable) 92 return (B_TRUE); 93 94 for (spa_feature_t i = 0; i < SPA_FEATURES; i++) { 95 zfeature_info_t *feature = &spa_feature_table[i]; 96 if (strcmp(guid, feature->fi_guid) == 0) 97 return (B_TRUE); 98 } 99 return (B_FALSE); 100} 101 102int 103zfeature_lookup_name(const char *name, spa_feature_t *res) 104{ 105 for (spa_feature_t i = 0; i < SPA_FEATURES; i++) { 106 zfeature_info_t *feature = &spa_feature_table[i]; 107 if (strcmp(name, feature->fi_uname) == 0) { 108 if (res != NULL) 109 *res = i; 110 return (0); 111 } 112 } 113 114 return (ENOENT); 115} 116 117static void 118zfeature_register(spa_feature_t fid, const char *guid, const char *name, 119 const char *desc, boolean_t readonly, boolean_t mos, 120 const spa_feature_t *deps) 121{ 122 zfeature_info_t *feature = &spa_feature_table[fid]; 123 static spa_feature_t nodeps[] = { SPA_FEATURE_NONE }; 124 125 ASSERT(name != NULL); 126 ASSERT(desc != NULL); 127 ASSERT(!readonly || !mos); 128 ASSERT3U(fid, <, SPA_FEATURES); 129 ASSERT(zfeature_is_valid_guid(guid)); 130 131 if (deps == NULL) 132 deps = nodeps; 133 134 feature->fi_feature = fid; 135 feature->fi_guid = guid; 136 feature->fi_uname = name; 137 feature->fi_desc = desc; 138 feature->fi_can_readonly = readonly; 139 feature->fi_mos = mos; 140 feature->fi_depends = deps; 141} 142 143void 144zpool_feature_init(void) 145{ 146 zfeature_register(SPA_FEATURE_ASYNC_DESTROY, 147 "com.delphix:async_destroy", "async_destroy", 148 "Destroy filesystems asynchronously.", B_TRUE, B_FALSE, NULL); 149 zfeature_register(SPA_FEATURE_EMPTY_BPOBJ, 150 "com.delphix:empty_bpobj", "empty_bpobj", 151 "Snapshots use less space.", B_TRUE, B_FALSE, NULL); 152 zfeature_register(SPA_FEATURE_LZ4_COMPRESS, 153 "org.illumos:lz4_compress", "lz4_compress", 154 "LZ4 compression algorithm support.", B_FALSE, B_FALSE, NULL); 155 zfeature_register(SPA_FEATURE_MULTI_VDEV_CRASH_DUMP, 156 "com.joyent:multi_vdev_crash_dump", "multi_vdev_crash_dump", 157 "Crash dumps to multiple vdev pools.", B_FALSE, B_FALSE, NULL); 158 zfeature_register(SPA_FEATURE_SPACEMAP_HISTOGRAM, 159 "com.delphix:spacemap_histogram", "spacemap_histogram", 160 "Spacemaps maintain space histograms.", B_TRUE, B_FALSE, NULL); 161 zfeature_register(SPA_FEATURE_EXTENSIBLE_DATASET, 162 "com.delphix:extensible_dataset", "extensible_dataset", 163 "Enhanced dataset functionality, used by other features.", 164 B_FALSE, B_FALSE, NULL); 165} 166