disklabel.c revision 1.31
1 /* $NetBSD: disklabel.c,v 1.31 2004/04/23 14:47:23 christos Exp $ */ 2 3 /* 4 * Copyright (c) 1983, 1987, 1993 5 * The Regents of the University of California. 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 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 #if defined(LIBC_SCCS) && !defined(lint) 34 #if 0 35 static char sccsid[] = "@(#)disklabel.c 8.2 (Berkeley) 5/3/95"; 36 #else 37 __RCSID("$NetBSD: disklabel.c,v 1.31 2004/04/23 14:47:23 christos Exp $"); 38 #endif 39 #endif /* LIBC_SCCS and not lint */ 40 41 #include "namespace.h" 42 #include <sys/param.h> 43 #define DKTYPENAMES 44 #define FSTYPENAMES 45 #include <sys/disklabel.h> 46 #include <ufs/ufs/dinode.h> 47 #include <ufs/ffs/fs.h> 48 49 #include <assert.h> 50 #include <ctype.h> 51 #include <errno.h> 52 #include <fcntl.h> 53 #include <stdio.h> 54 #include <stdlib.h> 55 #include <string.h> 56 #include <unistd.h> 57 58 #include <disktab.h> 59 60 #ifdef __weak_alias 61 __weak_alias(getdiskbyname,_getdiskbyname) 62 #endif 63 64 #if 0 65 static void error __P((int)); 66 #endif 67 static int gettype __P((char *, const char *const *)); 68 69 static const char *db_array[2] = { _PATH_DISKTAB, 0 }; 70 71 int 72 setdisktab(name) 73 const char *name; 74 { 75 if (!name || !*name) 76 return -1; 77 78 db_array[0] = name; 79 return 0; 80 } 81 82 83 struct disklabel * 84 getdiskbyname(name) 85 const char *name; 86 { 87 static struct disklabel disk; 88 struct disklabel *dp = &disk; 89 struct partition *pp; 90 char *buf; 91 char *cp, *cq; /* can't be */ 92 char p, max, psize[3], pbsize[3], 93 pfsize[3], poffset[3], ptype[3]; 94 u_int32_t *dx; 95 long f; 96 97 _DIAGASSERT(name != NULL); 98 99 if (cgetent(&buf, db_array, name) < 0) 100 return NULL; 101 102 memset(&disk, 0, sizeof(disk)); 103 /* 104 * typename 105 */ 106 cq = dp->d_typename; 107 cp = buf; 108 while (cq < dp->d_typename + sizeof(dp->d_typename) - 1 && 109 (*cq = *cp) && *cq != '|' && *cq != ':') 110 cq++, cp++; 111 *cq = '\0'; 112 /* 113 * boot name (optional) xxboot, bootxx 114 */ 115 cgetstr(buf, "b0", &dp->d_boot0); 116 cgetstr(buf, "b1", &dp->d_boot1); 117 118 if (cgetstr(buf, "ty", &cq) > 0 && strcmp(cq, "removable") == 0) 119 dp->d_flags |= D_REMOVABLE; 120 else if (cq && strcmp(cq, "simulated") == 0) 121 dp->d_flags |= D_RAMDISK; 122 if (cgetcap(buf, "sf", ':') != NULL) 123 dp->d_flags |= D_BADSECT; 124 125 #define getnumdflt(field, dname, dflt) \ 126 (field) = ((cgetnum(buf, dname, &f) == -1) ? (dflt) : (u_int32_t) f) 127 #define getnum(field, dname) \ 128 if (cgetnum(buf, dname, &f) != -1) field = (u_int32_t)f 129 130 getnumdflt(dp->d_secsize, "se", DEV_BSIZE); 131 getnum(dp->d_ntracks, "nt"); 132 getnum(dp->d_nsectors, "ns"); 133 getnum(dp->d_ncylinders, "nc"); 134 135 if (cgetstr(buf, "dt", &cq) > 0) 136 dp->d_type = gettype(cq, dktypenames); 137 else 138 getnumdflt(dp->d_type, "dt", 0); 139 getnumdflt(dp->d_secpercyl, "sc", dp->d_nsectors * dp->d_ntracks); 140 getnumdflt(dp->d_secperunit, "su", dp->d_secpercyl * dp->d_ncylinders); 141 getnumdflt(dp->d_rpm, "rm", 3600); 142 getnumdflt(dp->d_interleave, "il", 1); 143 getnumdflt(dp->d_trackskew, "sk", 0); 144 getnumdflt(dp->d_cylskew, "cs", 0); 145 getnumdflt(dp->d_headswitch, "hs", 0); 146 getnumdflt(dp->d_trkseek, "ts", 0); 147 getnumdflt(dp->d_bbsize, "bs", BBSIZE); 148 getnumdflt(dp->d_sbsize, "sb", SBLOCKSIZE); 149 strcpy(psize, "px"); /* XXX: strcpy is safe */ 150 strcpy(pbsize, "bx"); /* XXX: strcpy is safe */ 151 strcpy(pfsize, "fx"); /* XXX: strcpy is safe */ 152 strcpy(poffset, "ox"); /* XXX: strcpy is safe */ 153 strcpy(ptype, "tx"); /* XXX: strcpy is safe */ 154 max = 'a' - 1; 155 pp = &dp->d_partitions[0]; 156 for (p = 'a'; p < 'a' + MAXPARTITIONS; p++, pp++) { 157 long ff; 158 159 psize[1] = pbsize[1] = pfsize[1] = poffset[1] = ptype[1] = p; 160 if (cgetnum(buf, psize, &ff) == -1) 161 pp->p_size = 0; 162 else { 163 pp->p_size = (u_int32_t)ff; 164 getnum(pp->p_offset, poffset); 165 getnumdflt(pp->p_fsize, pfsize, 0); 166 if (pp->p_fsize) { 167 long bsize; 168 169 if (cgetnum(buf, pbsize, &bsize) == -1) 170 pp->p_frag = 8; 171 else 172 pp->p_frag = 173 (u_int8_t)(bsize / pp->p_fsize); 174 } 175 getnumdflt(pp->p_fstype, ptype, 0); 176 if (pp->p_fstype == 0 && cgetstr(buf, ptype, &cq) > 0) 177 pp->p_fstype = gettype(cq, fstypenames); 178 max = p; 179 } 180 } 181 dp->d_npartitions = max + 1 - 'a'; 182 strcpy(psize, "dx"); /* XXX: strcpy is safe */ 183 dx = dp->d_drivedata; 184 for (p = '0'; p < '0' + NDDATA; p++, dx++) { 185 psize[1] = p; 186 getnumdflt(*dx, psize, 0); 187 } 188 dp->d_magic = DISKMAGIC; 189 dp->d_magic2 = DISKMAGIC; 190 free(buf); 191 return (dp); 192 } 193 194 static int 195 gettype(t, names) 196 char *t; 197 const char *const *names; 198 { 199 const char *const *nm; 200 201 _DIAGASSERT(t != NULL); 202 _DIAGASSERT(names != NULL); 203 204 for (nm = names; *nm; nm++) 205 if (strcasecmp(t, *nm) == 0) 206 return (nm - names); 207 if (isdigit((unsigned char) *t)) 208 return (atoi(t)); 209 return (0); 210 } 211 212 #if 0 213 static void 214 error(err) 215 int err; 216 { 217 char *p; 218 219 (void)write(STDERR_FILENO, "disktab: ", 9); 220 (void)write(STDERR_FILENO, _PATH_DISKTAB, sizeof(_PATH_DISKTAB) - 1); 221 (void)write(STDERR_FILENO, ": ", 2); 222 p = strerror(err); 223 (void)write(STDERR_FILENO, p, strlen(p)); 224 (void)write(STDERR_FILENO, "\n", 1); 225 } 226 #endif 227
Indexes created Mon Sep 22 13:09:51 GMT 2025