disklabel.c revision 1.22
1 /* $NetBSD: disklabel.c,v 1.22 1998/11/12 15:51:44 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. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 #if defined(LIBC_SCCS) && !defined(lint) 38 #if 0 39 static char sccsid[] = "@(#)disklabel.c 8.2 (Berkeley) 5/3/95"; 40 #else 41 __RCSID("$NetBSD: disklabel.c,v 1.22 1998/11/12 15:51:44 christos Exp $"); 42 #endif 43 #endif /* LIBC_SCCS and not lint */ 44 45 #include "namespace.h" 46 #include <sys/param.h> 47 #define DKTYPENAMES 48 #define FSTYPENAMES 49 #include <sys/disklabel.h> 50 #include <ufs/ufs/dinode.h> 51 #include <ufs/ffs/fs.h> 52 53 #include <ctype.h> 54 #include <errno.h> 55 #include <fcntl.h> 56 #include <stdio.h> 57 #include <stdlib.h> 58 #include <string.h> 59 #include <unistd.h> 60 61 #ifdef __weak_alias 62 __weak_alias(getdiskbyname,_getdiskbyname); 63 #endif 64 65 #if 0 66 static void error __P((int)); 67 #endif 68 static int gettype __P((char *, const char *const *)); 69 70 struct disklabel * 71 getdiskbyname(name) 72 const char *name; 73 { 74 static struct disklabel disk; 75 struct disklabel *dp = &disk; 76 struct partition *pp; 77 char *buf; 78 char *db_array[2] = { _PATH_DISKTAB, 0 }; 79 char *cp, *cq; /* can't be */ 80 char p, max, psize[3], pbsize[3], 81 pfsize[3], poffset[3], ptype[3]; 82 u_int32_t *dx; 83 long f; 84 85 if (cgetent(&buf, db_array, name) < 0) 86 return NULL; 87 88 memset(&disk, 0, sizeof(disk)); 89 /* 90 * typename 91 */ 92 cq = dp->d_typename; 93 cp = buf; 94 while (cq < dp->d_typename + sizeof(dp->d_typename) - 1 && 95 (*cq = *cp) && *cq != '|' && *cq != ':') 96 cq++, cp++; 97 *cq = '\0'; 98 /* 99 * boot name (optional) xxboot, bootxx 100 */ 101 cgetstr(buf, "b0", &dp->d_boot0); 102 cgetstr(buf, "b1", &dp->d_boot1); 103 104 if (cgetstr(buf, "ty", &cq) > 0 && strcmp(cq, "removable") == 0) 105 dp->d_flags |= D_REMOVABLE; 106 else if (cq && strcmp(cq, "simulated") == 0) 107 dp->d_flags |= D_RAMDISK; 108 if (cgetcap(buf, "sf", ':') != NULL) 109 dp->d_flags |= D_BADSECT; 110 111 #define getnumdflt(field, dname, dflt) \ 112 (field) = (u_int32_t) ((cgetnum(buf, dname, &f) == -1) ? (dflt) : f) 113 #define getnum(field, dname) \ 114 if (cgetnum(buf, dname, &f) != -1) field = (u_int32_t)f 115 116 getnumdflt(dp->d_secsize, "se", DEV_BSIZE); 117 getnum(dp->d_ntracks, "nt"); 118 getnum(dp->d_nsectors, "ns"); 119 getnum(dp->d_ncylinders, "nc"); 120 121 if (cgetstr(buf, "dt", &cq) > 0) 122 dp->d_type = gettype(cq, dktypenames); 123 else 124 getnumdflt(dp->d_type, "dt", 0); 125 getnumdflt(dp->d_secpercyl, "sc", dp->d_nsectors * dp->d_ntracks); 126 getnumdflt(dp->d_secperunit, "su", dp->d_secpercyl * dp->d_ncylinders); 127 getnumdflt(dp->d_rpm, "rm", 3600); 128 getnumdflt(dp->d_interleave, "il", 1); 129 getnumdflt(dp->d_trackskew, "sk", 0); 130 getnumdflt(dp->d_cylskew, "cs", 0); 131 getnumdflt(dp->d_headswitch, "hs", 0); 132 getnumdflt(dp->d_trkseek, "ts", 0); 133 getnumdflt(dp->d_bbsize, "bs", BBSIZE); 134 getnumdflt(dp->d_sbsize, "sb", SBSIZE); 135 strcpy(psize, "px"); /* XXX: strcpy is safe */ 136 strcpy(pbsize, "bx"); /* XXX: strcpy is safe */ 137 strcpy(pfsize, "fx"); /* XXX: strcpy is safe */ 138 strcpy(poffset, "ox"); /* XXX: strcpy is safe */ 139 strcpy(ptype, "tx"); /* XXX: strcpy is safe */ 140 max = 'a' - 1; 141 pp = &dp->d_partitions[0]; 142 for (p = 'a'; p < 'a' + MAXPARTITIONS; p++, pp++) { 143 long ff; 144 145 psize[1] = pbsize[1] = pfsize[1] = poffset[1] = ptype[1] = p; 146 if (cgetnum(buf, psize, &ff) == -1) 147 pp->p_size = 0; 148 else { 149 pp->p_size = (u_int32_t)ff; 150 getnum(pp->p_offset, poffset); 151 getnumdflt(pp->p_fsize, pfsize, 0); 152 if (pp->p_fsize) { 153 long bsize; 154 155 if (cgetnum(buf, pbsize, &bsize) == -1) 156 pp->p_frag = 8; 157 else 158 pp->p_frag = 159 (u_int8_t)(bsize / pp->p_fsize); 160 } 161 getnumdflt(pp->p_fstype, ptype, 0); 162 if (pp->p_fstype == 0 && cgetstr(buf, ptype, &cq) > 0) 163 pp->p_fstype = gettype(cq, fstypenames); 164 max = p; 165 } 166 } 167 dp->d_npartitions = max + 1 - 'a'; 168 strcpy(psize, "dx"); /* XXX: strcpy is safe */ 169 dx = dp->d_drivedata; 170 for (p = '0'; p < '0' + NDDATA; p++, dx++) { 171 psize[1] = p; 172 getnumdflt(*dx, psize, 0); 173 } 174 dp->d_magic = DISKMAGIC; 175 dp->d_magic2 = DISKMAGIC; 176 free(buf); 177 return (dp); 178 } 179 180 static int 181 gettype(t, names) 182 char *t; 183 const char *const *names; 184 { 185 const char *const *nm; 186 187 for (nm = names; *nm; nm++) 188 if (strcasecmp(t, *nm) == 0) 189 return (nm - names); 190 if (isdigit(*t)) 191 return (atoi(t)); 192 return (0); 193 } 194 195 #if 0 196 static void 197 error(err) 198 int err; 199 { 200 char *p; 201 202 (void)write(STDERR_FILENO, "disktab: ", 9); 203 (void)write(STDERR_FILENO, _PATH_DISKTAB, sizeof(_PATH_DISKTAB) - 1); 204 (void)write(STDERR_FILENO, ": ", 2); 205 p = strerror(err); 206 (void)write(STDERR_FILENO, p, strlen(p)); 207 (void)write(STDERR_FILENO, "\n", 1); 208 } 209 #endif 210
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