1 /* $NetBSD: partitions.c,v 1.4 2019/10/26 07:32:52 martin Exp $ */ 2 3 /* 4 * Copyright 2018 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY PIERMONT INFORMATION SYSTEMS INC. ``AS IS'' 17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL PIERMONT INFORMATION SYSTEMS INC. BE 20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 26 * THE POSSIBILITY OF SUCH DAMAGE. 27 * 28 */ 29 30 #include "defs.h" 31 #include "mbr.h" 32 #include <assert.h> 33 34 /* 35 * A list of partitioning schemes, so we can iterate over everything 36 * supported (e.g. when partitioning a new disk). NULL terminated. 37 */ 38 const struct disk_partitioning_scheme **available_part_schemes; 39 /* 40 * The number of valid entries on above list 41 */ 42 size_t num_available_part_schemes; 43 44 /* 45 * Generic reader - query a disk device and read all partitions from it 46 */ 47 struct disk_partitions * 48 partitions_read_disk(const char *dev, daddr_t disk_size, bool no_mbr) 49 { 50 const struct disk_partitioning_scheme **ps; 51 52 if (!available_part_schemes) 53 return NULL; 54 55 for (ps = available_part_schemes; *ps; ps++) { 56 #ifdef HAVE_MBR 57 if (no_mbr && (*ps)->name == MSG_parttype_mbr) 58 continue; 59 #endif 60 struct disk_partitions *parts = 61 (*ps)->read_from_disk(dev, 0, disk_size, *ps); 62 if (parts) 63 return parts; 64 } 65 return NULL; 66 } 67 68 /*************** global init ****************************************/ 69 /* 70 * Helper structure to fill our global list of available partitioning 71 * schemes. 72 */ 73 struct part_scheme_desc { 74 bool (*is_available)(void); 75 const struct disk_partitioning_scheme *ps; 76 }; 77 78 #ifdef HAVE_GPT 79 bool gpt_parts_check(void); 80 extern const struct disk_partitioning_scheme gpt_parts; 81 #endif 82 #ifdef HAVE_MBR 83 extern const struct disk_partitioning_scheme mbr_parts; 84 #endif 85 86 extern const struct disk_partitioning_scheme disklabel_parts; 87 #if RAW_PART != 2 88 static struct disk_partitioning_scheme only_disklabel_parts; 89 90 /* 91 * If not overriden by MD code, we can not boot from plain 92 * disklabel disks (w/o MBR). 93 */ 94 static bool have_only_disklabel_boot_support(const char *disk) 95 { 96 #ifdef HAVE_PLAIN_DISKLABEL_BOOT 97 return HAVE_PLAIN_DISKLABEL_BOOT(disk); 98 #else 99 return false; 100 #endif 101 } 102 #endif 103 104 /* 105 * One time initialization 106 */ 107 void 108 partitions_init(void) 109 { 110 /* 111 * List of partitioning schemes. 112 * Order is important, the selection menu is created from start 113 * to end. Keep good defaults early. Most architectures will 114 * only offer very few entries. 115 */ 116 static const struct part_scheme_desc all_descs[] = { 117 #if RAW_PART == 2 /* only available as primary on some architectures */ 118 { NULL, &disklabel_parts }, 119 #endif 120 #ifdef HAVE_GPT 121 { gpt_parts_check, &gpt_parts }, 122 #endif 123 #ifdef HAVE_MBR 124 { NULL, &mbr_parts }, 125 #endif 126 #if RAW_PART != 2 /* "whole disk NetBSD" disklabel variant */ 127 { NULL, &only_disklabel_parts }, 128 #endif 129 }; 130 131 size_t i, avail; 132 const struct disk_partitioning_scheme **out; 133 bool *is_available; 134 static const size_t all_cnt = __arraycount(all_descs); 135 136 check_available_binaries(); 137 138 #if RAW_PART != 2 139 /* generate a variant of disklabel w/o parent scheme */ 140 only_disklabel_parts = disklabel_parts; 141 only_disklabel_parts.name = MSG_parttype_only_disklabel; 142 only_disklabel_parts.have_boot_support = 143 have_only_disklabel_boot_support; 144 #endif 145 146 147 is_available = malloc(all_cnt); 148 149 for (avail = i = 0; i < all_cnt; i++) { 150 is_available[i] = all_descs[i].is_available == NULL 151 || all_descs[i].is_available(); 152 if (is_available[i]) 153 avail++; 154 } 155 156 if (avail == 0) 157 return; 158 159 num_available_part_schemes = avail; 160 available_part_schemes = malloc(sizeof(*available_part_schemes) 161 * (avail+1)); 162 if (available_part_schemes == NULL) 163 return; 164 165 for (out = available_part_schemes, i = 0; i < all_cnt; i++) { 166 if (!is_available[i]) 167 continue; 168 *out++ = all_descs[i].ps; 169 } 170 *out = NULL; 171 172 free(is_available); 173 } 174