1 /* $OpenBSD: disk.c,v 1.34 2013/03/21 18:45:58 deraadt Exp $ */ 2 3 /* 4 * Copyright (c) 1997, 2001 Tobias Weingartner 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 THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 #include <sys/types.h> 29 #include <sys/fcntl.h> 30 #include <sys/ioctl.h> 31 #include <sys/dkio.h> 32 #include <sys/stdint.h> 33 #include <sys/stat.h> 34 #include <sys/disklabel.h> 35 #include <err.h> 36 #include <util.h> 37 #include <stdio.h> 38 #include <stdlib.h> 39 #include <unistd.h> 40 #include "disk.h" 41 #include "misc.h" 42 43 struct disklabel dl; 44 45 DISK_metrics *DISK_getlabelmetrics(char *name); 46 47 int 48 DISK_open(char *disk, int mode) 49 { 50 int fd; 51 struct stat st; 52 53 fd = opendev(disk, mode, OPENDEV_PART, NULL); 54 if (fd == -1) 55 err(1, "%s", disk); 56 if (fstat(fd, &st) == -1) 57 err(1, "%s", disk); 58 if (!S_ISCHR(st.st_mode) && !S_ISREG(st.st_mode)) 59 err(1, "%s is not a character device or a regular file", disk); 60 return (fd); 61 } 62 63 /* Routine to go after the disklabel for geometry 64 * information. This should work everywhere, but 65 * in the land of PC, things are not always what 66 * they seem. 67 */ 68 DISK_metrics * 69 DISK_getlabelmetrics(char *name) 70 { 71 DISK_metrics *lm = NULL; 72 u_int64_t sz, spc; 73 int fd; 74 75 /* Get label metrics */ 76 if ((fd = DISK_open(name, O_RDONLY)) != -1) { 77 lm = malloc(sizeof(DISK_metrics)); 78 if (lm == NULL) 79 err(1, NULL); 80 81 if (ioctl(fd, DIOCGPDINFO, &dl) == -1) { 82 warn("DIOCGPDINFO"); 83 free(lm); 84 lm = NULL; 85 } else { 86 lm->cylinders = dl.d_ncylinders; 87 lm->heads = dl.d_ntracks; 88 lm->sectors = dl.d_nsectors; 89 /* MBR handles only first UINT32_MAX sectors. */ 90 spc = (u_int64_t)lm->heads * lm->sectors; 91 sz = DL_GETDSIZE(&dl); 92 if (sz > UINT32_MAX) { 93 lm->cylinders = UINT32_MAX / spc; 94 lm->size = lm->cylinders * spc; 95 warnx("disk too large (%llu sectors)." 96 " size truncated.", sz); 97 } else 98 lm->size = sz; 99 unit_types[SECTORS].conversion = dl.d_secsize; 100 } 101 close(fd); 102 } 103 104 return (lm); 105 } 106 107 /* This is ugly, and convoluted. All the magic 108 * for disk geo/size happens here. Basically, 109 * the real size is the one we will use in the 110 * rest of the program, the label size is what we 111 * got from the disklabel. If the disklabel fails, 112 * we assume we are working with a normal file, 113 * and should request the user to specify the 114 * geometry he/she wishes to use. 115 */ 116 int 117 DISK_getmetrics(disk_t *disk, DISK_metrics *user) 118 { 119 120 disk->label = DISK_getlabelmetrics(disk->name); 121 122 /* If user supplied, use that */ 123 if (user) { 124 disk->real = user; 125 return (0); 126 } 127 128 /* If we have a label, use that */ 129 if (disk->label) { 130 disk->real = disk->label; 131 return (0); 132 } 133 134 /* Can not get geometry, punt */ 135 disk->real = NULL; 136 return (1); 137 } 138 139 /* 140 * Print the disk geometry information. Take an optional modifier 141 * to indicate the units that should be used for display. 142 */ 143 int 144 DISK_printmetrics(disk_t *disk, char *units) 145 { 146 const int secsize = unit_types[SECTORS].conversion; 147 double size; 148 int i; 149 150 i = unit_lookup(units); 151 size = ((double)disk->real->size * secsize) / unit_types[i].conversion; 152 printf("Disk: %s\t", disk->name); 153 if (disk->real) { 154 printf("geometry: %d/%d/%d [%.0f ", 155 disk->real->cylinders, disk->real->heads, 156 disk->real->sectors, size); 157 if (i == SECTORS && secsize != DEV_BSIZE) 158 printf("%d-byte ", secsize); 159 printf("%s]\n", unit_types[i].lname); 160 } else 161 printf("geometry: <none>\n"); 162 163 return (0); 164 } 165 166