disklabel.c revision 1.2
1 /* $NetBSD: disklabel.c,v 1.2 1998/07/22 12:49:42 leo Exp $ */ 2 3 /* 4 * Copyright (c) 1995 Waldi Ravens 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 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by Waldi Ravens. 18 * 4. The name of the author may not be used to endorse or promote products 19 * derived from this software without specific prior written permission 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 #include <sys/types.h> 34 #include <sys/param.h> 35 #include <ufs/ufs/dinode.h> 36 #include <ufs/ffs/fs.h> 37 #include <sys/disklabel.h> 38 #include <machine/ahdilabel.h> 39 #include <unistd.h> 40 #include <string.h> 41 #include <stdlib.h> 42 #include <fcntl.h> 43 #include <err.h> 44 45 #if (BBSIZE < MINBBSIZE) 46 #error BBSIZE is smaller than MINBBSIZE 47 #endif 48 49 struct ahdilabel { 50 u_int nsecs; 51 daddr_t bslst; 52 daddr_t bslend; 53 u_int nroots; 54 daddr_t *roots; 55 u_int nparts; 56 struct ahdi_part *parts; 57 }; 58 59 u_int dkcksum __P((struct disklabel *)); 60 daddr_t readdisklabel __P((char *, struct disklabel *)); 61 62 static int bsd_label __P((int, off_t, struct disklabel *)); 63 static int ahdi_label __P((int, daddr_t *, struct disklabel *)); 64 static int ahdi_getparts __P((int, daddr_t, daddr_t, struct ahdilabel *)); 65 66 u_int 67 dkcksum (dl) 68 struct disklabel *dl; 69 { 70 u_int16_t sum = 0, 71 *st = (u_int16_t *)dl, 72 *end = (u_int16_t *)&dl->d_partitions[dl->d_npartitions]; 73 74 while (st < end) 75 sum ^= *st++; 76 return(sum); 77 } 78 79 daddr_t 80 readdisklabel (fn, dl) 81 char *fn; 82 struct disklabel *dl; 83 { 84 int fd, e; 85 daddr_t bbsec; 86 87 memset(dl, 0, sizeof *dl); 88 89 if ((fd = open(fn, O_RDONLY)) < 0) 90 err(EXIT_FAILURE, "%s", fn); 91 92 /* Try NetBSD/Atari format first */ 93 if ((e = bsd_label(fd, (off_t)0, dl)) < 0) 94 err(EXIT_FAILURE, "%s", fn); 95 if (!e) 96 return(0); 97 98 /* Try unprotected AHDI format last */ 99 if ((e = ahdi_label(fd, &bbsec, dl)) < 0) 100 err(EXIT_FAILURE, "%s", fn); 101 if (!e) 102 return(bbsec); 103 104 warnx("%s: Unknown disk label format.", fn); 105 return(NO_BOOT_BLOCK); 106 } 107 108 static int 109 bsd_label (fd, offs, label) 110 int fd; 111 off_t offs; 112 struct disklabel *label; 113 { 114 struct bootblock bb; 115 struct disklabel *p; 116 117 if (lseek(fd, offs, SEEK_SET) != offs) 118 return(-1); 119 if (read(fd, &bb, sizeof(bb)) != sizeof(bb)) 120 return(-1); 121 122 p = (struct disklabel *)bb.bb_label; 123 if ( (offs == 0 && bb.bb_magic != NBDAMAGIC) 124 || (offs != 0 && bb.bb_magic != AHDIMAGIC) 125 || p->d_npartitions > MAXPARTITIONS 126 || p->d_magic2 != DISKMAGIC 127 || p->d_magic != DISKMAGIC 128 || dkcksum(p) != 0 129 ) { 130 return(1); 131 } 132 133 *label = *p; 134 return(0); 135 } 136 137 static int 138 ahdi_label (fd, bbsec, label) 139 int fd; 140 daddr_t *bbsec; 141 struct disklabel *label; 142 { 143 struct ahdilabel al; 144 u_int i, j; 145 int e; 146 147 memset(&al, 0, sizeof(al)); 148 if ((e = ahdi_getparts(fd, AHDI_BBLOCK, AHDI_BBLOCK, &al))) 149 return(e); 150 151 /* 152 * Perform sanity checks. 153 */ 154 if (al.bslst == 0 || al.bslend == 0) 155 return(1); 156 if (al.nsecs == 0 || al.nparts == 0) 157 return(1); 158 if (al.nparts > AHDI_MAXPARTS) 159 warnx("Too many AHDI partitions (%u).", al.nparts); 160 for (i = 0; i < al.nparts; ++i) { 161 struct ahdi_part *p1 = &al.parts[i]; 162 for (j = 0; j < al.nroots; ++j) { 163 daddr_t aux = al.roots[j]; 164 if (aux >= p1->ap_st && aux <= p1->ap_end) 165 return(1); 166 } 167 for (j = i + 1; j < al.nparts; ++j) { 168 struct ahdi_part *p2 = &al.parts[j]; 169 if (p1->ap_st >= p2->ap_st && p1->ap_st <= p2->ap_end) 170 return(1); 171 if (p2->ap_st >= p1->ap_st && p2->ap_st <= p1->ap_end) 172 return(1); 173 } 174 if (p1->ap_st >= al.bslst && p1->ap_st <= al.bslend) 175 return(1); 176 if (al.bslst >= p1->ap_st && al.bslst <= p1->ap_end) 177 return(1); 178 } 179 180 /* 181 * Search for a NetBSD boot block 182 */ 183 for (i = 0; i < al.nparts; ++i) { 184 struct ahdi_part *pd = &al.parts[i]; 185 u_int id = *((u_int32_t *)&pd->ap_flg); 186 187 if (id == AHDI_PID_NBD || id == AHDI_PID_RAW) { 188 off_t offs = pd->ap_st * AHDI_BSIZE; 189 if ((e = bsd_label(fd, offs, label)) < 0) 190 return(e); 191 if (!e) { 192 *bbsec = pd->ap_st; /* got it */ 193 return(0); 194 } 195 } 196 } 197 *bbsec = NO_BOOT_BLOCK; /* AHDI label, no NetBSD boot block */ 198 return(0); 199 } 200 201 static int 202 ahdi_getparts(fd, rsec, esec, alab) 203 int fd; 204 daddr_t rsec, 205 esec; 206 struct ahdilabel *alab; 207 { 208 struct ahdi_part *part, *end; 209 struct ahdi_root root; 210 off_t ro; 211 212 ro = rsec * AHDI_BSIZE; 213 if (lseek(fd, ro, SEEK_SET) != ro) { 214 off_t mend = lseek(fd, 0, SEEK_END); 215 if (mend == -1 || mend > ro) 216 return(-1); 217 return(1); 218 } 219 if (read(fd, &root, sizeof(root)) != sizeof(root)) 220 return(-1); 221 222 if (rsec == AHDI_BBLOCK) 223 end = &root.ar_parts[AHDI_MAXRPD]; 224 else end = &root.ar_parts[AHDI_MAXARPD]; 225 for (part = root.ar_parts; part < end; ++part) { 226 u_int id = *((u_int32_t *)&part->ap_flg); 227 if (!(id & 0x01000000)) 228 continue; 229 if ((id &= 0x00ffffff) == AHDI_PID_XGM) { 230 int e; 231 daddr_t aux = part->ap_st + esec; 232 alab->roots = realloc(alab->roots, 233 (alab->nroots + 1) * sizeof(*alab->roots)); 234 alab->roots[alab->nroots++] = aux; 235 e = ahdi_getparts(fd, aux, 236 esec == AHDI_BBLOCK ? aux : esec, alab); 237 if (e) 238 return(e); 239 } else { 240 struct ahdi_part *p; 241 alab->parts = realloc(alab->parts, 242 (alab->nparts + 1) * sizeof(*alab->parts)); 243 p = &alab->parts[alab->nparts++]; 244 *((u_int32_t *)&p->ap_flg) = id; 245 p->ap_st = part->ap_st + rsec; 246 p->ap_end = p->ap_st + part->ap_size - 1; 247 } 248 } 249 alab->nsecs = root.ar_hdsize; 250 alab->bslst = root.ar_bslst; 251 alab->bslend = root.ar_bslst + root.ar_bslsize - 1; 252 return(0); 253 } 254
Indexes created Tue Sep 30 11:09:46 GMT 2025