1 /* $NetBSD: mbrlabel.c,v 1.20 2002/05/21 01:39:56 yamt Exp $ */ 2 3 /* 4 * Copyright (C) 1998 Wolfgang Solfrank. 5 * Copyright (C) 1998 TooLs GmbH. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by TooLs GmbH. 19 * 4. The name of TooLs GmbH may not be used to endorse or promote products 20 * derived from this software without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR 23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 25 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 26 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 27 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 28 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 29 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 30 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 31 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34 #include <sys/cdefs.h> 35 #ifndef lint 36 __RCSID("$NetBSD: mbrlabel.c,v 1.20 2002/05/21 01:39:56 yamt Exp $"); 37 #endif /* not lint */ 38 39 #include <stdio.h> 40 #include <fcntl.h> 41 #include <stdlib.h> 42 #include <string.h> 43 #include <unistd.h> 44 #include <util.h> 45 46 #include <sys/param.h> 47 #define FSTYPENAMES 48 #include <sys/disklabel.h> 49 #include <sys/disklabel_mbr.h> 50 #include <sys/ioctl.h> 51 52 #include "dkcksum.h" 53 #include "extern.h" 54 55 int main(int, char **); 56 void usage(void); 57 void getlabel(int); 58 void setlabel(int, int); 59 int getparts(int, u_int32_t, u_int32_t, int); 60 int nbsdtype(int); 61 u_int16_t getshort(void *); 62 u_int32_t getlong(void *); 63 64 struct disklabel label; 65 66 void 67 getlabel(int sd) 68 { 69 70 if (ioctl(sd, DIOCGDINFO, &label) < 0) { 71 perror("get label"); 72 exit(1); 73 } 74 /* 75 * Some ports seem to not set the number of partitions 76 * correctly, albeit they seem to set the raw partition ok! 77 */ 78 if (label.d_npartitions <= getrawpartition()) 79 label.d_npartitions = getrawpartition() + 1; 80 } 81 82 void 83 setlabel(int sd, int doraw) 84 { 85 86 label.d_checksum = 0; 87 label.d_checksum = dkcksum(&label); 88 if (ioctl(sd, doraw ? DIOCWDINFO : DIOCSDINFO, &label) < 0) { 89 perror("set label"); 90 exit(1); 91 } 92 } 93 94 static struct typetab { 95 int mbrtype; 96 int nbsdtype; 97 } typetable[] = { 98 { MBR_PTYPE_386BSD, FS_BSDFFS }, 99 { MBR_PTYPE_FAT12, FS_MSDOS }, 100 { MBR_PTYPE_FAT16B, FS_MSDOS }, 101 { MBR_PTYPE_FAT16L, FS_MSDOS }, 102 { MBR_PTYPE_FAT16S, FS_MSDOS }, 103 { MBR_PTYPE_FAT32, FS_MSDOS }, 104 { MBR_PTYPE_FAT32L, FS_MSDOS }, 105 { MBR_PTYPE_LNXEXT2, FS_EX2FS }, 106 { MBR_PTYPE_LNXSWAP, FS_SWAP }, 107 { MBR_PTYPE_NETBSD, FS_BSDFFS }, 108 { MBR_PTYPE_NTFS, FS_NTFS }, 109 { 0, 0 } 110 }; 111 112 int 113 nbsdtype(int type) 114 { 115 struct typetab *tt; 116 117 for (tt = typetable; tt->mbrtype; tt++) 118 if (tt->mbrtype == type) 119 return (tt->nbsdtype); 120 return (FS_OTHER); 121 } 122 123 u_int16_t 124 getshort(void *p) 125 { 126 unsigned char *cp = p; 127 128 return (cp[0] | (cp[1] << 8)); 129 } 130 131 u_int32_t 132 getlong(void *p) 133 { 134 unsigned char *cp = p; 135 136 return (cp[0] | (cp[1] << 8) | (cp[2] << 16) | (cp[3] << 24)); 137 } 138 139 int 140 getparts(int sd, u_int32_t off, u_int32_t extoff, int verbose) 141 { 142 unsigned char buf[DEV_BSIZE]; 143 struct mbr_partition parts[NMBRPART]; 144 struct partition npe; 145 off_t loff; 146 int i, j, unused, changed; 147 148 changed = 0; 149 loff = (off_t)off * DEV_BSIZE; 150 151 if (lseek(sd, loff, SEEK_SET) != loff) { 152 perror("seek label"); 153 exit(1); 154 } 155 if (read(sd, buf, sizeof buf) != DEV_BSIZE) { 156 perror("read label"); 157 exit(1); 158 } 159 if (getshort(buf + MBR_MAGICOFF) != MBR_MAGIC) 160 return (changed); 161 memcpy(parts, buf + MBR_PARTOFF, sizeof parts); 162 163 /* scan partition table */ 164 for (i = 0; i < NMBRPART; i++) { 165 if (parts[i].mbrp_typ == 0 || 166 /* extended partitions are handled below */ 167 MBR_IS_EXTENDED(parts[i].mbrp_typ)) 168 continue; 169 170 memset((void *)&npe, 0, sizeof(npe)); 171 npe.p_size = getlong(&parts[i].mbrp_size); 172 npe.p_offset = getlong(&parts[i].mbrp_start) + off; 173 npe.p_fstype = nbsdtype(parts[i].mbrp_typ); 174 175 /* find existing entry, or first free slot */ 176 unused = -1; /* flag as no free slot */ 177 if (verbose) 178 printf( 179 "Found %s partition; size %u (%u MB), offset %u\n", 180 fstypenames[npe.p_fstype], 181 npe.p_size, npe.p_size / 2048, npe.p_offset); 182 for (j = 0; j < label.d_npartitions; j++) { 183 struct partition *lpe; 184 185 if (j == RAW_PART) 186 continue; 187 lpe = &label.d_partitions[j]; 188 if (lpe->p_size == npe.p_size && 189 lpe->p_offset == npe.p_offset 190 #ifdef notyet 191 && (lpe->p_fstype == npe.p_fstype || 192 lpe->p_fstype == FS_UNUSED) */ 193 #endif 194 ) { 195 if (verbose) 196 printf( 197 " skipping existing %s partition at slot %c.\n", 198 fstypenames[lpe->p_fstype], 199 j + 'a'); 200 unused = -2; /* flag as existing */ 201 break; 202 } 203 if (unused == -1 && lpe->p_size == 0 && 204 lpe->p_fstype == FS_UNUSED) 205 unused = j; 206 } 207 if (unused == -2) 208 continue; /* entry exists, skip... */ 209 if (unused == -1) { 210 if (label.d_npartitions < MAXPARTITIONS) { 211 unused = label.d_npartitions; 212 label.d_npartitions++; 213 } else { 214 printf( 215 " WARNING: no slots free for %s partition.\n", 216 fstypenames[npe.p_fstype]); 217 continue; 218 } 219 } 220 221 if (verbose) 222 printf(" adding %s partition to slot %c.\n", 223 fstypenames[npe.p_fstype], unused + 'a'); 224 switch (npe.p_fstype) { 225 case FS_BSDFFS: 226 npe.p_size = 16384; /* XXX */ 227 npe.p_fsize = 1024; 228 npe.p_frag = 8; 229 npe.p_cpg = 16; 230 break; 231 #ifdef __does_not_happen__ 232 case FS_BSDLFS: 233 npe.p_size = 16384; /* XXX */ 234 npe.p_fsize = 1024; 235 npe.p_frag = 8; 236 npe.p_sgs = XXX; 237 break; 238 #endif 239 } 240 changed++; 241 label.d_partitions[unused] = npe; 242 } 243 244 /* recursively scan extended partitions */ 245 for (i = 0; i < NMBRPART; i++) { 246 u_int32_t poff; 247 248 if (MBR_IS_EXTENDED(parts[i].mbrp_typ)) { 249 poff = getlong(&parts[i].mbrp_start) + extoff; 250 changed += getparts(sd, poff, 251 extoff ? extoff : poff, verbose); 252 } 253 } 254 return (changed); 255 } 256 257 void 258 usage(void) 259 { 260 fprintf(stderr, "Usage: %s [-fqrw] rawdisk\n", getprogname()); 261 exit(1); 262 } 263 264 265 int 266 main(int argc, char **argv) 267 { 268 int sd, ch, changed; 269 char name[MAXPATHLEN]; 270 int force; /* force label update */ 271 int raw; /* update on-disk label as well */ 272 int verbose; /* verbose output */ 273 int write_it; /* update in-core label if changed */ 274 275 force = 0; 276 raw = 0; 277 verbose = 1; 278 write_it = 0; 279 while ((ch = getopt(argc, argv, "fqrw")) != -1) { 280 switch (ch) { 281 case 'f': 282 force = 1; 283 break; 284 case 'q': 285 verbose = 0; 286 break; 287 case 'r': 288 raw = 1; 289 break; 290 case 'w': 291 write_it = 1; 292 break; 293 default: 294 usage(); 295 } 296 } 297 argc -= optind; 298 argv += optind; 299 if (argc != 1) 300 usage(); 301 302 if ((sd = opendisk(argv[0], write_it ? O_RDWR : O_RDONLY, name, 303 (size_t)MAXPATHLEN, 0)) < 0) { 304 perror(argv[0]); 305 exit(1); 306 } 307 getlabel(sd); 308 changed = getparts(sd, MBR_BBSECTOR, 0, verbose); 309 310 if (verbose) { 311 putchar('\n'); 312 showpartitions(stdout, &label, 0); 313 putchar('\n'); 314 } 315 if (write_it) { 316 if (! changed && ! force) 317 printf("No change; not updating disk label.\n"); 318 else { 319 if (verbose) 320 printf("Updating in-core %sdisk label.\n", 321 raw ? "and on-disk " : ""); 322 setlabel(sd, raw); 323 } 324 } else { 325 printf("Not updating disk label.\n"); 326 } 327 close(sd); 328 return (0); 329 } 330