zfeature_common.c revision 236884
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. 24236884Smm */ 25236884Smm 26236884Smm#ifdef _KERNEL 27236884Smm#include <sys/systm.h> 28236884Smm#else 29236884Smm#include <errno.h> 30236884Smm#include <string.h> 31236884Smm#endif 32236884Smm#include <sys/debug.h> 33236884Smm#include <sys/fs/zfs.h> 34236884Smm#include <sys/types.h> 35236884Smm#include "zfeature_common.h" 36236884Smm 37236884Smm/* 38236884Smm * Set to disable all feature checks while opening pools, allowing pools with 39236884Smm * unsupported features to be opened. Set for testing only. 40236884Smm */ 41236884Smmboolean_t zfeature_checks_disable = B_FALSE; 42236884Smm 43236884Smmzfeature_info_t spa_feature_table[SPA_FEATURES]; 44236884Smm 45236884Smm/* 46236884Smm * Valid characters for feature guids. This list is mainly for aesthetic 47236884Smm * purposes and could be expanded in the future. There are different allowed 48236884Smm * characters in the guids reverse dns portion (before the colon) and its 49236884Smm * short name (after the colon). 50236884Smm */ 51236884Smmstatic int 52236884Smmvalid_char(char c, boolean_t after_colon) 53236884Smm{ 54236884Smm return ((c >= 'a' && c <= 'z') || 55236884Smm (c >= '0' && c <= '9') || 56236884Smm c == (after_colon ? '_' : '.')); 57236884Smm} 58236884Smm 59236884Smm/* 60236884Smm * Every feature guid must contain exactly one colon which separates a reverse 61236884Smm * dns organization name from the feature's "short" name (e.g. 62236884Smm * "com.company:feature_name"). 63236884Smm */ 64236884Smmboolean_t 65236884Smmzfeature_is_valid_guid(const char *name) 66236884Smm{ 67236884Smm int i; 68236884Smm boolean_t has_colon = B_FALSE; 69236884Smm 70236884Smm i = 0; 71236884Smm while (name[i] != '\0') { 72236884Smm char c = name[i++]; 73236884Smm if (c == ':') { 74236884Smm if (has_colon) 75236884Smm return (B_FALSE); 76236884Smm has_colon = B_TRUE; 77236884Smm continue; 78236884Smm } 79236884Smm if (!valid_char(c, has_colon)) 80236884Smm return (B_FALSE); 81236884Smm } 82236884Smm 83236884Smm return (has_colon); 84236884Smm} 85236884Smm 86236884Smmboolean_t 87236884Smmzfeature_is_supported(const char *guid) 88236884Smm{ 89236884Smm if (zfeature_checks_disable) 90236884Smm return (B_TRUE); 91236884Smm 92236884Smm return (0 == zfeature_lookup_guid(guid, NULL)); 93236884Smm} 94236884Smm 95236884Smmint 96236884Smmzfeature_lookup_guid(const char *guid, zfeature_info_t **res) 97236884Smm{ 98236884Smm for (int i = 0; i < SPA_FEATURES; i++) { 99236884Smm zfeature_info_t *feature = &spa_feature_table[i]; 100236884Smm if (strcmp(guid, feature->fi_guid) == 0) { 101236884Smm if (res != NULL) 102236884Smm *res = feature; 103236884Smm return (0); 104236884Smm } 105236884Smm } 106236884Smm 107236884Smm return (ENOENT); 108236884Smm} 109236884Smm 110236884Smmint 111236884Smmzfeature_lookup_name(const char *name, zfeature_info_t **res) 112236884Smm{ 113236884Smm for (int i = 0; i < SPA_FEATURES; i++) { 114236884Smm zfeature_info_t *feature = &spa_feature_table[i]; 115236884Smm if (strcmp(name, feature->fi_uname) == 0) { 116236884Smm if (res != NULL) 117236884Smm *res = feature; 118236884Smm return (0); 119236884Smm } 120236884Smm } 121236884Smm 122236884Smm return (ENOENT); 123236884Smm} 124236884Smm 125236884Smmstatic void 126236884Smmzfeature_register(int fid, const char *guid, const char *name, const char *desc, 127236884Smm boolean_t readonly, boolean_t mos, zfeature_info_t **deps) 128236884Smm{ 129236884Smm zfeature_info_t *feature = &spa_feature_table[fid]; 130236884Smm static zfeature_info_t *nodeps[] = { NULL }; 131236884Smm 132236884Smm ASSERT(name != NULL); 133236884Smm ASSERT(desc != NULL); 134236884Smm ASSERT(!readonly || !mos); 135236884Smm ASSERT3U(fid, <, SPA_FEATURES); 136236884Smm ASSERT(zfeature_is_valid_guid(guid)); 137236884Smm 138236884Smm if (deps == NULL) 139236884Smm deps = nodeps; 140236884Smm 141236884Smm feature->fi_guid = guid; 142236884Smm feature->fi_uname = name; 143236884Smm feature->fi_desc = desc; 144236884Smm feature->fi_can_readonly = readonly; 145236884Smm feature->fi_mos = mos; 146236884Smm feature->fi_depends = deps; 147236884Smm} 148236884Smm 149236884Smmvoid 150236884Smmzpool_feature_init(void) 151236884Smm{ 152236884Smm zfeature_register(SPA_FEATURE_ASYNC_DESTROY, 153236884Smm "com.delphix:async_destroy", "async_destroy", 154236884Smm "Destroy filesystems asynchronously.", B_TRUE, B_FALSE, NULL); 155236884Smm} 156