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) 2012 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/inttypes.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 */ 44 boolean_t zfeature_checks_disable = B_FALSE; 45 46 zfeature_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 */ 54 static int 55 valid_char(char c, boolean_t after_colon) 56 { 57 return ((c >= 'a' && c <= 'z') || 58 (c >= '0' && c <= '9') || 59 c == (after_colon ? '_' : '.')); 60 } 61 62 /* 63 * Every feature guid must contain exactly one colon which separates a reverse 64 * dns organization name from the feature's "short" name (e.g. 65 * "com.company:feature_name"). 66 */ 67 boolean_t 68 zfeature_is_valid_guid(const char *name) 69 { 70 int i; 71 boolean_t has_colon = B_FALSE; 72 73 i = 0; 74 while (name[i] != '\0') { 75 char c = name[i++]; 76 if (c == ':') { 77 if (has_colon) 78 return (B_FALSE); 79 has_colon = B_TRUE; 80 continue; 81 } 82 if (!valid_char(c, has_colon)) 83 return (B_FALSE); 84 } 85 86 return (has_colon); 87 } 88 89 boolean_t 90 zfeature_is_supported(const char *guid) 91 { 92 if (zfeature_checks_disable) 93 return (B_TRUE); 94 95 return (0 == zfeature_lookup_guid(guid, NULL)); 96 } 97 98 int 99 zfeature_lookup_guid(const char *guid, zfeature_info_t **res) 100 { 101 for (int i = 0; i < SPA_FEATURES; i++) { 102 zfeature_info_t *feature = &spa_feature_table[i]; 103 if (strcmp(guid, feature->fi_guid) == 0) { 104 if (res != NULL) 105 *res = feature; 106 return (0); 107 } 108 } 109 110 return (ENOENT); 111 } 112 113 int 114 zfeature_lookup_name(const char *name, zfeature_info_t **res) 115 { 116 for (int i = 0; i < SPA_FEATURES; i++) { 117 zfeature_info_t *feature = &spa_feature_table[i]; 118 if (strcmp(name, feature->fi_uname) == 0) { 119 if (res != NULL) 120 *res = feature; 121 return (0); 122 } 123 } 124 125 return (ENOENT); 126 } 127 128 static void 129 zfeature_register(int fid, const char *guid, const char *name, const char *desc, 130 boolean_t readonly, boolean_t mos, zfeature_info_t **deps) 131 { 132 zfeature_info_t *feature = &spa_feature_table[fid]; 133 static zfeature_info_t *nodeps[] = { NULL }; 134 135 ASSERT(name != NULL); 136 ASSERT(desc != NULL); 137 ASSERT(!readonly || !mos); 138 ASSERT3U(fid, <, SPA_FEATURES); 139 ASSERT(zfeature_is_valid_guid(guid)); 140 141 if (deps == NULL) 142 deps = nodeps; 143 144 feature->fi_guid = guid; 145 feature->fi_uname = name; 146 feature->fi_desc = desc; 147 feature->fi_can_readonly = readonly; 148 feature->fi_mos = mos; 149 feature->fi_depends = deps; 150 } 151 152 void 153 zpool_feature_init(void) 154 { 155 zfeature_register(SPA_FEATURE_ASYNC_DESTROY, 156 "com.delphix:async_destroy", "async_destroy", 157 "Destroy filesystems asynchronously.", B_TRUE, B_FALSE, NULL); 158 zfeature_register(SPA_FEATURE_EMPTY_BPOBJ, 159 "com.delphix:empty_bpobj", "empty_bpobj", 160 "Snapshots use less space.", B_TRUE, B_FALSE, NULL); 161 zfeature_register(SPA_FEATURE_LZ4_COMPRESS, 162 "org.illumos:lz4_compress", "lz4_compress", 163 "LZ4 compression algorithm support.", B_FALSE, B_FALSE, NULL); 164 zfeature_register(SPA_FEATURE_MULTI_VDEV_CRASH_DUMP, 165 "com.joyent:multi_vdev_crash_dump", "multi_vdev_crash_dump", 166 "Crash dumps to multiple vdev pools.", B_FALSE, B_FALSE, NULL); 167 } 168