1 /* $OpenBSD: disk.c,v 1.28 2007/04/27 11:42:44 krw 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 <err.h> 29 #include <util.h> 30 #include <stdio.h> 31 #include <stdlib.h> 32 #include <unistd.h> 33 #include <sys/fcntl.h> 34 #include <sys/ioctl.h> 35 #include <sys/types.h> 36 #include <sys/stat.h> 37 #include <sys/disklabel.h> 38 #include <sys/param.h> 39 #include "disk.h" 40 #include "misc.h" 41 42 DISK_metrics *DISK_getlabelmetrics(char *name); 43 44 int 45 DISK_open(char *disk, int mode) 46 { 47 int fd; 48 struct stat st; 49 50 fd = opendev(disk, mode, OPENDEV_PART, NULL); 51 if (fd == -1) 52 err(1, "%s", disk); 53 if (fstat(fd, &st) == -1) 54 err(1, "%s", disk); 55 if (!S_ISCHR(st.st_mode) && !S_ISREG(st.st_mode)) 56 err(1, "%s is not a character device or a regular file", disk); 57 return (fd); 58 } 59 60 int 61 DISK_close(int fd) 62 { 63 64 return (close(fd)); 65 } 66 67 /* Routine to go after the disklabel for geometry 68 * information. This should work everywhere, but 69 * in the land of PC, things are not always what 70 * they seem. 71 */ 72 DISK_metrics * 73 DISK_getlabelmetrics(char *name) 74 { 75 DISK_metrics *lm = NULL; 76 struct disklabel dl; 77 int fd; 78 79 /* Get label metrics */ 80 if ((fd = DISK_open(name, O_RDONLY)) != -1) { 81 lm = malloc(sizeof(DISK_metrics)); 82 if (lm == NULL) 83 err(1, NULL); 84 85 if (ioctl(fd, DIOCGPDINFO, &dl) == -1 && 86 ioctl(fd, DIOCGDINFO, &dl) == -1) { 87 warn("DIOCGDINFO"); 88 free(lm); 89 lm = NULL; 90 } else { 91 lm->cylinders = dl.d_ncylinders; 92 lm->heads = dl.d_ntracks; 93 lm->sectors = dl.d_nsectors; 94 lm->size = dl.d_secperunit; 95 unit_types[SECTORS].conversion = dl.d_secsize; 96 } 97 DISK_close(fd); 98 } 99 100 return (lm); 101 } 102 103 /* This is ugly, and convoluted. All the magic 104 * for disk geo/size happens here. Basically, 105 * the real size is the one we will use in the 106 * rest of the program, the label size is what we 107 * got from the disklabel. If the disklabel fails, 108 * we assume we are working with a normal file, 109 * and should request the user to specify the 110 * geometry he/she wishes to use. 111 */ 112 int 113 DISK_getmetrics(disk_t *disk, DISK_metrics *user) 114 { 115 116 disk->label = DISK_getlabelmetrics(disk->name); 117 118 /* If user supplied, use that */ 119 if (user) { 120 disk->real = user; 121 return (0); 122 } 123 124 /* If we have a label, use that */ 125 if (disk->label) { 126 disk->real = disk->label; 127 return (0); 128 } 129 130 /* Can not get geometry, punt */ 131 disk->real = NULL; 132 return (1); 133 } 134 135 /* 136 * Print the disk geometry information. Take an optional modifier 137 * to indicate the units that should be used for display. 138 */ 139 int 140 DISK_printmetrics(disk_t *disk, char *units) 141 { 142 const int secsize = unit_types[SECTORS].conversion; 143 double size; 144 int i; 145 146 i = unit_lookup(units); 147 size = ((double)disk->real->size * secsize) / unit_types[i].conversion; 148 printf("Disk: %s\t", disk->name); 149 if (disk->real) { 150 printf("geometry: %d/%d/%d [%.0f ", 151 disk->real->cylinders, disk->real->heads, 152 disk->real->sectors, size); 153 if (i == SECTORS && secsize != DEV_BSIZE) 154 printf("%d-byte ", secsize); 155 printf("%s]\n", unit_types[i].lname); 156 } else 157 printf("geometry: <none>\n"); 158 159 return (0); 160 } 161 162