| 1 | /*␊ |
| 2 | * Copyright (c) 2002 Apple Computer, Inc. All rights reserved.␊ |
| 3 | *␊ |
| 4 | * ␊ |
| 5 | * This file contains Original Code and/or Modifications of Original Code␊ |
| 6 | * as defined in and that are subject to the Apple Public Source License␊ |
| 7 | * Version 2.0 (the 'License'). You may not use this file except in␊ |
| 8 | * compliance with the License. Please obtain a copy of the License at␊ |
| 9 | * http://www.opensource.apple.com/apsl/ and read it before using this␊ |
| 10 | * file.␊ |
| 11 | * ␊ |
| 12 | * The Original Code and all software distributed under the License are␊ |
| 13 | * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER␊ |
| 14 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,␊ |
| 15 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,␊ |
| 16 | * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.␊ |
| 17 | * Please see the License for the specific language governing rights and␊ |
| 18 | * limitations under the License.␊ |
| 19 | * ␊ |
| 20 | *␊ |
| 21 | * Copyright (c) 1997, 2001 Tobias Weingartner␊ |
| 22 | * All rights reserved.␊ |
| 23 | *␊ |
| 24 | * Redistribution and use in source and binary forms, with or without␊ |
| 25 | * modification, are permitted provided that the following conditions␊ |
| 26 | * are met:␊ |
| 27 | * 1. Redistributions of source code must retain the above copyright␊ |
| 28 | * notice, this list of conditions and the following disclaimer.␊ |
| 29 | * 2. Redistributions in binary form must reproduce the above copyright␊ |
| 30 | * notice, this list of conditions and the following disclaimer in the␊ |
| 31 | * documentation and/or other materials provided with the distribution.␊ |
| 32 | * 3. All advertising materials mentioning features or use of this software␊ |
| 33 | * must display the following acknowledgement:␊ |
| 34 | * This product includes software developed by Tobias Weingartner.␊ |
| 35 | * 4. The name of the author may not be used to endorse or promote products␊ |
| 36 | * derived from this software without specific prior written permission.␊ |
| 37 | *␊ |
| 38 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR␊ |
| 39 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES␊ |
| 40 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.␊ |
| 41 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,␊ |
| 42 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT␊ |
| 43 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,␊ |
| 44 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY␊ |
| 45 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT␊ |
| 46 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF␊ |
| 47 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.␊ |
| 48 | */␊ |
| 49 | ␊ |
| 50 | #include <err.h>␊ |
| 51 | #include <util.h>␊ |
| 52 | #include <stdio.h>␊ |
| 53 | #include <stdlib.h>␊ |
| 54 | #include <unistd.h>␊ |
| 55 | #include <string.h>␊ |
| 56 | #include <sys/fcntl.h>␊ |
| 57 | #include <sys/ioctl.h>␊ |
| 58 | #include <sys/types.h>␊ |
| 59 | #include <sys/stat.h>␊ |
| 60 | #include <sys/reboot.h>␊ |
| 61 | #include <sys/disk.h>␊ |
| 62 | #include <sys/param.h>␊ |
| 63 | #include <sys/sysctl.h>␊ |
| 64 | #ifdef __i386__␊ |
| 65 | #include <pexpert/i386/boot.h>␊ |
| 66 | #endif␊ |
| 67 | #include "disk.h"␊ |
| 68 | ␊ |
| 69 | int␊ |
| 70 | DISK_open(disk, mode)␊ |
| 71 | ␉char *disk;␊ |
| 72 | ␉int mode;␊ |
| 73 | {␊ |
| 74 | ␉int fd;␊ |
| 75 | ␉struct stat st;␊ |
| 76 | ␊ |
| 77 | ␉fd = open(disk, mode);␊ |
| 78 | ␉if (fd == -1)␊ |
| 79 | ␉␉err(1, "%s", disk);␊ |
| 80 | ␉if (fstat(fd, &st) == -1)␊ |
| 81 | ␉␉err(1, "%s", disk);␊ |
| 82 | ␉/* Don't be so picky about needing a character device */␊ |
| 83 | ␉if (!S_ISCHR(st.st_mode) && !S_ISBLK(st.st_mode) && !S_ISREG(st.st_mode))␊ |
| 84 | ␉␉errx(1, "%s is not a character device or a regular file", disk);␊ |
| 85 | ␉return (fd);␊ |
| 86 | }␊ |
| 87 | ␊ |
| 88 | int␊ |
| 89 | DISK_openshared(disk, mode, shared)␊ |
| 90 | ␉char *disk;␊ |
| 91 | ␉int mode;␊ |
| 92 | ␉int *shared;␊ |
| 93 | {␊ |
| 94 | ␉int fd;␊ |
| 95 | ␉struct stat st;␊ |
| 96 | ␉*shared = 0;␊ |
| 97 | ␊ |
| 98 | ␉fd = open(disk, mode|O_EXLOCK);␊ |
| 99 | ␉if (fd == -1) {␊ |
| 100 | ␉ // if we can't have exclusive access, attempt␊ |
| 101 | ␉ // to gracefully degrade to shared access␊ |
| 102 | ␉ fd = open(disk, mode|O_SHLOCK);␊ |
| 103 | ␉ if(fd == -1)␊ |
| 104 | ␉␉err(1, "%s", disk);␊ |
| 105 | ␊ |
| 106 | ␉ *shared = 1;␊ |
| 107 | ␉}␊ |
| 108 | ␊ |
| 109 | ␉if (fstat(fd, &st) == -1)␊ |
| 110 | ␉␉err(1, "%s", disk);␊ |
| 111 | ␉/* Don't be so picky about needing a character device */␊ |
| 112 | ␉if (!S_ISCHR(st.st_mode) && !S_ISBLK(st.st_mode) && !S_ISREG(st.st_mode))␊ |
| 113 | ␉␉errx(1, "%s is not a character device or a regular file", disk);␊ |
| 114 | ␉return (fd);␊ |
| 115 | }␊ |
| 116 | ␊ |
| 117 | int␊ |
| 118 | DISK_close(fd)␊ |
| 119 | ␉int fd;␊ |
| 120 | {␊ |
| 121 | ␊ |
| 122 | ␉return (close(fd));␊ |
| 123 | }␊ |
| 124 | ␊ |
| 125 | /* Given a size in the metrics,␊ |
| 126 | * fake up a CHS geometry.␊ |
| 127 | */␊ |
| 128 | void␊ |
| 129 | DISK_fake_CHS(DISK_metrics *lm)␊ |
| 130 | {␊ |
| 131 | int heads = 4;␊ |
| 132 | int spt = 63;␊ |
| 133 | int cylinders = (lm->size / heads / spt);␊ |
| 134 | ␊ |
| 135 | while (cylinders > 1024 && heads < 256) {␊ |
| 136 | heads *= 2;␊ |
| 137 | cylinders /= 2;␊ |
| 138 | }␊ |
| 139 | if (heads == 256) {␊ |
| 140 | heads = 255;␊ |
| 141 | cylinders = (lm->size / heads / spt);␊ |
| 142 | }␉␊ |
| 143 | lm->cylinders = cylinders;␊ |
| 144 | lm->heads = heads;␊ |
| 145 | lm->sectors = spt;␊ |
| 146 | }␊ |
| 147 | ␊ |
| 148 | /* Routine to go after the disklabel for geometry␊ |
| 149 | * information. This should work everywhere, but␊ |
| 150 | * in the land of PC, things are not always what␊ |
| 151 | * they seem.␊ |
| 152 | */␊ |
| 153 | DISK_metrics *␊ |
| 154 | DISK_getlabelmetrics(name)␊ |
| 155 | ␉char *name;␊ |
| 156 | {␊ |
| 157 | ␉DISK_metrics *lm = NULL;␊ |
| 158 | ␉long long size;␊ |
| 159 | ␉uint32_t sector_size;␊ |
| 160 | ␉int fd;␊ |
| 161 | ␉struct stat st;␊ |
| 162 | ␊ |
| 163 | ␉/* Get label metrics */␊ |
| 164 | ␉if ((fd = DISK_open(name, O_RDONLY)) != -1) {␊ |
| 165 | ␉␉lm = malloc(sizeof(DISK_metrics));␊ |
| 166 | ␊ |
| 167 | ␉␉if (fstat(fd, &st) == -1)␊ |
| 168 | ␉␉ err(1, "%s", name);␊ |
| 169 | ␉␉if (!S_ISREG(st.st_mode) || S_ISBLK(st.st_mode)) {␊ |
| 170 | ␉␉ if (ioctl(fd, DKIOCGETBLOCKCOUNT, &size) == -1) {␊ |
| 171 | ␉␉ err(1, "Could not get disk block count");␊ |
| 172 | ␉␉ free(lm);␊ |
| 173 | ␉␉ return NULL;␊ |
| 174 | ␉␉ }␊ |
| 175 | ␉␉ if (ioctl(fd, DKIOCGETBLOCKSIZE, §or_size) == -1) {␊ |
| 176 | ␉␉ err(1, "Could not get disk block size");␊ |
| 177 | ␉␉ free(lm);␊ |
| 178 | ␉␉ return NULL;␊ |
| 179 | ␉␉ }␊ |
| 180 | ␉␉} else {␊ |
| 181 | ␉␉ sector_size = 512;␊ |
| 182 | ␉␉ size = st.st_size / sector_size;␊ |
| 183 | ␉␉}␊ |
| 184 | ␊ |
| 185 | ␉␉lm->sector_size = sector_size;␊ |
| 186 | ␉␉lm->size = size;␊ |
| 187 | ␉␉DISK_fake_CHS(lm);␊ |
| 188 | ␉␉DISK_close(fd);␊ |
| 189 | ␉}␊ |
| 190 | ␊ |
| 191 | ␉return (lm);␊ |
| 192 | }␊ |
| 193 | ␊ |
| 194 | /*␊ |
| 195 | * Don't try to get BIOS disk metrics.␊ |
| 196 | */␊ |
| 197 | DISK_metrics *␊ |
| 198 | DISK_getbiosmetrics(name)␊ |
| 199 | ␉char *name;␊ |
| 200 | {␊ |
| 201 | ␉return (NULL);␊ |
| 202 | }␊ |
| 203 | ␊ |
| 204 | /* This is ugly, and convoluted. All the magic␊ |
| 205 | * for disk geo/size happens here. Basically,␊ |
| 206 | * the real size is the one we will use in the␊ |
| 207 | * rest of the program, the label size is what we␊ |
| 208 | * got from the disklabel. If the disklabel fails,␊ |
| 209 | * we assume we are working with a normal file,␊ |
| 210 | * and should request the user to specify the␊ |
| 211 | * geometry he/she wishes to use.␊ |
| 212 | */␊ |
| 213 | int␊ |
| 214 | DISK_getmetrics(disk, user)␊ |
| 215 | ␉disk_t *disk;␊ |
| 216 | ␉DISK_metrics *user;␊ |
| 217 | {␊ |
| 218 | ␊ |
| 219 | ␉disk->label = DISK_getlabelmetrics(disk->name);␊ |
| 220 | ␉disk->bios = DISK_getbiosmetrics(disk->name);␊ |
| 221 | ␊ |
| 222 | ␉/* If user supplied, use that */␊ |
| 223 | ␉if (user) {␊ |
| 224 | ␉␉disk->real = user;␊ |
| 225 | ␉␉return (0);␊ |
| 226 | ␉}␊ |
| 227 | ␊ |
| 228 | ␉/* Fixup bios metrics to include cylinders past 1023 boundary */␊ |
| 229 | ␉if(disk->label && disk->bios){␊ |
| 230 | ␉␉int cyls, secs;␊ |
| 231 | ␊ |
| 232 | ␉␉cyls = disk->label->size / (disk->bios->heads * disk->bios->sectors);␊ |
| 233 | ␉␉secs = cyls * (disk->bios->heads * disk->bios->sectors);␊ |
| 234 | ␉␉if ((disk->label->size - secs) < 0)␊ |
| 235 | ␉␉␉errx(1, "BIOS fixup botch (%d sectors)", disk->label->size - secs);␊ |
| 236 | ␉␉disk->bios->cylinders = cyls;␊ |
| 237 | ␉␉disk->bios->size = secs;␊ |
| 238 | ␉}␊ |
| 239 | ␊ |
| 240 | ␉/* If we have a (fixed) BIOS geometry, use that */␊ |
| 241 | ␉if (disk->bios) {␊ |
| 242 | ␉␉disk->real = disk->bios;␊ |
| 243 | ␉␉return (0);␊ |
| 244 | ␉}␊ |
| 245 | ␊ |
| 246 | ␉/* If we have a label, use that */␊ |
| 247 | ␉if (disk->label) {␊ |
| 248 | ␉␉disk->real = disk->label;␊ |
| 249 | ␉␉return (0);␊ |
| 250 | ␉}␊ |
| 251 | ␊ |
| 252 | ␉/* Can not get geometry, punt */␊ |
| 253 | ␉disk->real = NULL;␊ |
| 254 | ␉return (1);␊ |
| 255 | }␊ |
| 256 | ␊ |
| 257 | /* Get the disk's native sector size, updating the metrics' sector_size field.␊ |
| 258 | */␊ |
| 259 | int␊ |
| 260 | DISK_get_sector_size(disk, user)␊ |
| 261 | disk_t *disk;␊ |
| 262 | DISK_metrics *user;␊ |
| 263 | {␊ |
| 264 | int ret;␊ |
| 265 | int fd;␊ |
| 266 | uint32_t sector_size;␊ |
| 267 | ␊ |
| 268 | /* Default to 512 bytes per sector, in case of failure. */␊ |
| 269 | user->sector_size = 512;␊ |
| 270 | ret = 1;␊ |
| 271 | ␊ |
| 272 | fd = DISK_open(disk->name, O_RDONLY);␊ |
| 273 | if (fd == -1) {␊ |
| 274 | ␉err(1, "Could not open %s", disk->name);␊ |
| 275 | } else {␊ |
| 276 | if (ioctl(fd, DKIOCGETBLOCKSIZE, §or_size) == -1) {␊ |
| 277 | err(1, "Could not get disk block size");␊ |
| 278 | } else {␊ |
| 279 | user->sector_size = sector_size;␊ |
| 280 | ret = 0;␊ |
| 281 | }␊ |
| 282 | }␊ |
| 283 | ␊ |
| 284 | return ret;␊ |
| 285 | }␊ |
| 286 | ␊ |
| 287 | int␊ |
| 288 | DISK_printmetrics(disk)␊ |
| 289 | ␉disk_t *disk;␊ |
| 290 | {␊ |
| 291 | ␊ |
| 292 | ␉printf("Disk: %s\t", disk->name);␊ |
| 293 | ␉if (disk->real) {␊ |
| 294 | ␉␉printf("geometry: %d/%d/%d [%d sectors]\n", disk->real->cylinders,␊ |
| 295 | ␉␉ disk->real->heads, disk->real->sectors, disk->real->size);␊ |
| 296 | ␉␉if (disk->real->sector_size != 512)␊ |
| 297 | ␉␉␉printf("Sector size: %d bytes\n", disk->real->sector_size);␊ |
| 298 | ␉} else {␊ |
| 299 | ␉␉printf("geometry: <none>\n");␊ |
| 300 | ␉}␊ |
| 301 | ␊ |
| 302 | ␉return (0);␊ |
| 303 | }␊ |
| 304 | ␊ |
| 305 | |
