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 */ 26 27 #ifdef _KERNEL 28 #include <sys/systm.h> 29 #else 30 #include <errno.h> 31 #include <string.h> 32 #endif 33 #include <sys/debug.h> 34 #include <sys/fs/zfs.h> 35 #include <sys/inttypes.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 */ 43 boolean_t zfeature_checks_disable = B_FALSE; 44 45 zfeature_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 */ 53 static int 54 valid_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 */ 66 boolean_t 67 zfeature_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 88 boolean_t 89 zfeature_is_supported(const char *guid) 90 { 91 if (zfeature_checks_disable) 92 return (B_TRUE); 93 94 return (0 == zfeature_lookup_guid(guid, NULL)); 95 } 96 97 int 98 zfeature_lookup_guid(const char *guid, zfeature_info_t **res) 99 { 100 for (int i = 0; i < SPA_FEATURES; i++) { 101 zfeature_info_t *feature = &spa_feature_table[i]; 102 if (strcmp(guid, feature->fi_guid) == 0) { 103 if (res != NULL) 104 *res = feature; 105 return (0); 106 } 107 } 108 109 return (ENOENT); 110 } 111 112 int 113 zfeature_lookup_name(const char *name, zfeature_info_t **res) 114 { 115 for (int i = 0; i < SPA_FEATURES; i++) { 116 zfeature_info_t *feature = &spa_feature_table[i]; 117 if (strcmp(name, feature->fi_uname) == 0) { 118 if (res != NULL) 119 *res = feature; 120 return (0); 121 } 122 } 123 124 return (ENOENT); 125 } 126 127 static void 128 zfeature_register(int fid, const char *guid, const char *name, const char *desc, 129 boolean_t readonly, boolean_t mos, zfeature_info_t **deps) 130 { 131 zfeature_info_t *feature = &spa_feature_table[fid]; 132 static zfeature_info_t *nodeps[] = { NULL }; 133 134 ASSERT(name != NULL); 135 ASSERT(desc != NULL); 136 ASSERT(!readonly || !mos); 137 ASSERT3U(fid, <, SPA_FEATURES); 138 ASSERT(zfeature_is_valid_guid(guid)); 139 140 if (deps == NULL) 141 deps = nodeps; 142 143 feature->fi_guid = guid; 144 feature->fi_uname = name; 145 feature->fi_desc = desc; 146 feature->fi_can_readonly = readonly; 147 feature->fi_mos = mos; 148 feature->fi_depends = deps; 149 } 150 151 void 152 zpool_feature_init(void) 153 { 154 zfeature_register(SPA_FEATURE_ASYNC_DESTROY, 155 "com.delphix:async_destroy", "async_destroy", 156 "Destroy filesystems asynchronously.", B_TRUE, B_FALSE, NULL); 157 zfeature_register(SPA_FEATURE_EMPTY_BPOBJ, 158 "com.delphix:empty_bpobj", "empty_bpobj", 159 "Snapshots use less space.", B_TRUE, B_FALSE, NULL); 160 zfeature_register(SPA_FEATURE_LZ4_COMPRESS, 161 "org.illumos:lz4_compress", "lz4_compress", 162 "LZ4 compression algorithm support.", B_FALSE, B_FALSE, NULL); 163 } 164