zfeature_common.c revision 246586
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/* 23236884Smm * Copyright (c) 2012 by Delphix. All rights reserved. 24246586Sdelphij * Copyright (c) 2013 by Saso Kiselkov. All rights reserved. 25236884Smm */ 26236884Smm 27236884Smm#ifdef _KERNEL 28236884Smm#include <sys/systm.h> 29236884Smm#else 30236884Smm#include <errno.h> 31236884Smm#include <string.h> 32236884Smm#endif 33236884Smm#include <sys/debug.h> 34236884Smm#include <sys/fs/zfs.h> 35236884Smm#include <sys/types.h> 36236884Smm#include "zfeature_common.h" 37236884Smm 38236884Smm/* 39236884Smm * Set to disable all feature checks while opening pools, allowing pools with 40236884Smm * unsupported features to be opened. Set for testing only. 41236884Smm */ 42236884Smmboolean_t zfeature_checks_disable = B_FALSE; 43236884Smm 44236884Smmzfeature_info_t spa_feature_table[SPA_FEATURES]; 45236884Smm 46236884Smm/* 47236884Smm * Valid characters for feature guids. This list is mainly for aesthetic 48236884Smm * purposes and could be expanded in the future. There are different allowed 49236884Smm * characters in the guids reverse dns portion (before the colon) and its 50236884Smm * short name (after the colon). 51236884Smm */ 52236884Smmstatic int 53236884Smmvalid_char(char c, boolean_t after_colon) 54236884Smm{ 55236884Smm return ((c >= 'a' && c <= 'z') || 56236884Smm (c >= '0' && c <= '9') || 57236884Smm c == (after_colon ? '_' : '.')); 58236884Smm} 59236884Smm 60236884Smm/* 61236884Smm * Every feature guid must contain exactly one colon which separates a reverse 62236884Smm * dns organization name from the feature's "short" name (e.g. 63236884Smm * "com.company:feature_name"). 64236884Smm */ 65236884Smmboolean_t 66236884Smmzfeature_is_valid_guid(const char *name) 67236884Smm{ 68236884Smm int i; 69236884Smm boolean_t has_colon = B_FALSE; 70236884Smm 71236884Smm i = 0; 72236884Smm while (name[i] != '\0') { 73236884Smm char c = name[i++]; 74236884Smm if (c == ':') { 75236884Smm if (has_colon) 76236884Smm return (B_FALSE); 77236884Smm has_colon = B_TRUE; 78236884Smm continue; 79236884Smm } 80236884Smm if (!valid_char(c, has_colon)) 81236884Smm return (B_FALSE); 82236884Smm } 83236884Smm 84236884Smm return (has_colon); 85236884Smm} 86236884Smm 87236884Smmboolean_t 88236884Smmzfeature_is_supported(const char *guid) 89236884Smm{ 90236884Smm if (zfeature_checks_disable) 91236884Smm return (B_TRUE); 92236884Smm 93236884Smm return (0 == zfeature_lookup_guid(guid, NULL)); 94236884Smm} 95236884Smm 96236884Smmint 97236884Smmzfeature_lookup_guid(const char *guid, zfeature_info_t **res) 98236884Smm{ 99236884Smm for (int i = 0; i < SPA_FEATURES; i++) { 100236884Smm zfeature_info_t *feature = &spa_feature_table[i]; 101236884Smm if (strcmp(guid, feature->fi_guid) == 0) { 102236884Smm if (res != NULL) 103236884Smm *res = feature; 104236884Smm return (0); 105236884Smm } 106236884Smm } 107236884Smm 108236884Smm return (ENOENT); 109236884Smm} 110236884Smm 111236884Smmint 112236884Smmzfeature_lookup_name(const char *name, zfeature_info_t **res) 113236884Smm{ 114236884Smm for (int i = 0; i < SPA_FEATURES; i++) { 115236884Smm zfeature_info_t *feature = &spa_feature_table[i]; 116236884Smm if (strcmp(name, feature->fi_uname) == 0) { 117236884Smm if (res != NULL) 118236884Smm *res = feature; 119236884Smm return (0); 120236884Smm } 121236884Smm } 122236884Smm 123236884Smm return (ENOENT); 124236884Smm} 125236884Smm 126236884Smmstatic void 127236884Smmzfeature_register(int fid, const char *guid, const char *name, const char *desc, 128236884Smm boolean_t readonly, boolean_t mos, zfeature_info_t **deps) 129236884Smm{ 130236884Smm zfeature_info_t *feature = &spa_feature_table[fid]; 131236884Smm static zfeature_info_t *nodeps[] = { NULL }; 132236884Smm 133236884Smm ASSERT(name != NULL); 134236884Smm ASSERT(desc != NULL); 135236884Smm ASSERT(!readonly || !mos); 136236884Smm ASSERT3U(fid, <, SPA_FEATURES); 137236884Smm ASSERT(zfeature_is_valid_guid(guid)); 138236884Smm 139236884Smm if (deps == NULL) 140236884Smm deps = nodeps; 141236884Smm 142236884Smm feature->fi_guid = guid; 143236884Smm feature->fi_uname = name; 144236884Smm feature->fi_desc = desc; 145236884Smm feature->fi_can_readonly = readonly; 146236884Smm feature->fi_mos = mos; 147236884Smm feature->fi_depends = deps; 148236884Smm} 149236884Smm 150236884Smmvoid 151236884Smmzpool_feature_init(void) 152236884Smm{ 153236884Smm zfeature_register(SPA_FEATURE_ASYNC_DESTROY, 154236884Smm "com.delphix:async_destroy", "async_destroy", 155236884Smm "Destroy filesystems asynchronously.", B_TRUE, B_FALSE, NULL); 156239774Smm zfeature_register(SPA_FEATURE_EMPTY_BPOBJ, 157239774Smm "com.delphix:empty_bpobj", "empty_bpobj", 158239774Smm "Snapshots use less space.", B_TRUE, B_FALSE, NULL); 159246586Sdelphij zfeature_register(SPA_FEATURE_LZ4_COMPRESS, 160246586Sdelphij "org.illumos:lz4_compress", "lz4_compress", 161246586Sdelphij "LZ4 compression algorithm support.", B_FALSE, B_FALSE, NULL); 162236884Smm} 163