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mbrlabel.c revision 1.13 
      1 /*	$NetBSD: mbrlabel.c,v 1.13 2001/01/04 00:57:14 lukem 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 1.13 2001/01/04 00:57:14 lukem 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 #define	FIRSTPART	0
     56 
     57 int	main(int, char **);
     58 void	usage(void);
     59 void	getlabel(int);
     60 void	setlabel(int, int);
     61 int	getparts(int, int, u_int32_t, u_int32_t, int);
     62 int	nbsdtype(int);
     63 u_int32_t getlong(void *p);
     64 
     65 struct disklabel label;
     66 
     67 void
     68 getlabel(int sd)
     69 {
     70 
     71 	if (ioctl(sd, DIOCGDINFO, &label) < 0) {
     72 		perror("get label");
     73 		exit(1);
     74 	}
     75 	/*
     76 	 * Some ports seem to not set the number of partitions
     77 	 * correctly, albeit they seem to set the raw partiton ok!
     78 	 */
     79 	if (label.d_npartitions <= RAW_PART)
     80 		label.d_npartitions = RAW_PART + 1;
     81 }
     82 
     83 void
     84 setlabel(int sd, int doraw)
     85 {
     86 
     87 	label.d_checksum = 0;
     88 	label.d_checksum = dkcksum(&label);
     89 	if (ioctl(sd, doraw ? DIOCWDINFO : DIOCSDINFO, &label) < 0) {
     90 		perror("set label");
     91 		exit(1);
     92 	}
     93 }
     94 
     95 static struct typetab {
     96 	int mbrtype;
     97 	int nbsdtype;
     98 } typetable[] = {
     99 	{ MBR_PTYPE_386BSD,	FS_BSDFFS },
    100 	{ MBR_PTYPE_FAT12,	FS_MSDOS },
    101 	{ MBR_PTYPE_FAT16B,	FS_MSDOS },
    102 	{ MBR_PTYPE_FAT16L,	FS_MSDOS },
    103 	{ MBR_PTYPE_FAT16S,	FS_MSDOS },
    104 	{ MBR_PTYPE_FAT32,	FS_MSDOS },
    105 	{ MBR_PTYPE_FAT32L,	FS_MSDOS },
    106 	{ MBR_PTYPE_LNXEXT2,	FS_EX2FS },
    107 	{ MBR_PTYPE_LNXSWAP,	FS_SWAP },
    108 	{ MBR_PTYPE_NETBSD,	FS_BSDFFS },
    109 	{ MBR_PTYPE_NTFS,	FS_NTFS },
    110 	{ 0, 0 }
    111 };
    112 
    113 int
    114 nbsdtype(int type)
    115 {
    116 	struct typetab *tt;
    117 
    118 	for (tt = typetable; tt->mbrtype; tt++)
    119 		if (tt->mbrtype == type)
    120 			return (tt->nbsdtype);
    121 	return (FS_OTHER);
    122 }
    123 
    124 u_int32_t
    125 getlong(void *p)
    126 {
    127 	unsigned char *cp = p;
    128 
    129 	return (cp[0] | (cp[1] << 8) | (cp[2] << 16) | (cp[3] << 24));
    130 }
    131 
    132 int
    133 getparts(int sd, int np, u_int32_t off, u_int32_t extoff, int verbose)
    134 {
    135 	unsigned char		buf[DEV_BSIZE];
    136 	struct mbr_partition	parts[NMBRPART];
    137 	struct partition	npe;
    138 	off_t			loff;
    139 	int			i, j, unused, changed;
    140 
    141 	changed = 0;
    142 	loff = (off_t)off * DEV_BSIZE;
    143 
    144 	if (lseek(sd, loff, SEEK_SET) != loff) {
    145 		perror("seek label");
    146 		exit(1);
    147 	}
    148 	if (read(sd, buf, DEV_BSIZE) != DEV_BSIZE) {
    149 		perror("read label");
    150 		exit(1);
    151 	}
    152 	if (buf[0x1fe] != 0x55 || buf[0x1ff] != 0xaa)
    153 		return (changed);
    154 	memcpy(parts, buf + MBR_PARTOFF, sizeof parts);
    155 
    156 				/* scan partition table */
    157 	for (i = 0; i < NMBRPART; i++) {
    158 		if (parts[i].mbrp_typ == 0 ||
    159 				/* extended partitions are handled below */
    160 		    MBR_IS_EXTENDED(parts[i].mbrp_typ))
    161 			continue;
    162 
    163 		memset((void *)&npe, 0, sizeof(npe));
    164 		npe.p_size = getlong(&parts[i].mbrp_size);
    165 		npe.p_offset = getlong(&parts[i].mbrp_start) + off;
    166 		npe.p_fstype = nbsdtype(parts[i].mbrp_typ);
    167 
    168 				/* find existing entry, or first free slot */
    169 		unused = -1;	/* flag as no free slot */
    170 		if (verbose)
    171 			printf(
    172 			    "Found %s partition; size %u (%u MB), offset %u\n",
    173 			    fstypenames[npe.p_fstype],
    174 			    npe.p_size, npe.p_size / 2048, npe.p_offset);
    175 		for (j = 0; j < label.d_npartitions; j++) {
    176 			struct partition *lpe;
    177 
    178 			if (j == RAW_PART)
    179 				continue;
    180 			lpe = &label.d_partitions[j];
    181 			if (lpe->p_size == npe.p_size &&
    182 			    lpe->p_offset == npe.p_offset
    183 #ifdef notyet
    184 			    && (lpe->p_fstype == npe.p_fstype ||
    185 			     lpe->p_fstype == FS_UNUSED) */
    186 #endif
    187 			     ) {
    188 				if (verbose)
    189 					printf(
    190 			    "  skipping existing %s partition at slot %c.\n",
    191 					    fstypenames[lpe->p_fstype],
    192 					    j + 'a');
    193 				unused = -2;	/* flag as existing */
    194 				break;
    195 			}
    196 			if (unused == -1 && lpe->p_size == 0 &&
    197 			    lpe->p_fstype == FS_UNUSED)
    198 				unused = j;
    199 		}
    200 		if (unused == -2)
    201 			continue;	/* entry exists, skip... */
    202 		if (unused == -1) {
    203 			if (label.d_npartitions < MAXPARTITIONS) {
    204 				unused = label.d_npartitions;
    205 				label.d_npartitions++;
    206 			} else {
    207 				printf(
    208 				"  WARNING: no slots free for %s partition.\n",
    209 				    fstypenames[npe.p_fstype]);
    210 				continue;
    211 			}
    212 		}
    213 
    214 		if (verbose)
    215 			printf("  adding %s partition to slot %c.\n",
    216 			    fstypenames[npe.p_fstype], unused + 'a');
    217 		switch (npe.p_fstype) {
    218 		case FS_BSDFFS:
    219 			npe.p_size = 16384;	/* XXX */
    220 			npe.p_fsize = 1024;
    221 			npe.p_frag = 8;
    222 			npe.p_cpg = 16;
    223 			break;
    224 #ifdef	__does_not_happen__
    225 		case FS_BSDLFS:
    226 			npe.p_size = 16384;	/* XXX */
    227 			npe.p_fsize = 1024;
    228 			npe.p_frag = 8;
    229 			npe.p_sgs = XXX;
    230 			break;
    231 #endif
    232 		}
    233 		changed++;
    234 		label.d_partitions[unused] = npe;
    235 	}
    236 
    237 				/* recursively scan extended partitions */
    238 	for (i = 0; i < NMBRPART; i++) {
    239 		u_int32_t poff;
    240 
    241 		if (MBR_IS_EXTENDED(parts[i].mbrp_typ)) {
    242 			poff = getlong(&parts[i].mbrp_start) + extoff;
    243 			changed += getparts(sd, np, poff,
    244 			    extoff ? extoff : poff, verbose);
    245 		}
    246 	}
    247 	return (changed);
    248 }
    249 
    250 void
    251 usage(void)
    252 {
    253 	extern char *__progname;
    254 
    255 	fprintf(stderr, "usage: %s [-fqrw] rawdisk\n", __progname);
    256 	exit(1);
    257 }
    258 
    259 
    260 int
    261 main(int argc, char **argv)
    262 {
    263 	int	sd, ch, changed;
    264 	char	name[MAXPATHLEN];
    265 	int	force;			/* force label update */
    266 	int	raw;			/* update on-disk label as well */
    267 	int	verbose;		/* verbose output */
    268 	int	write;			/* update in-core label if changed */
    269 
    270 	force = 0;
    271 	raw = 0;
    272 	verbose = 1;
    273 	write = 0;
    274 	while ((ch = getopt(argc, argv, "fqrw")) != -1) {
    275 		switch (ch) {
    276 		case 'f':
    277 			force = 1;
    278 			break;
    279 		case 'q':
    280 			verbose = 0;
    281 			break;
    282 		case 'r':
    283 			raw = 1;
    284 			break;
    285 		case 'w':
    286 			write = 1;
    287 			break;
    288 		default:
    289 			usage();
    290 		}
    291 	}
    292 	argc -= optind;
    293 	argv += optind;
    294 	if (argc != 1)
    295 		usage();
    296 
    297 	if ((sd = opendisk(argv[0], O_RDWR, name, MAXPATHLEN, 0)) < 0) {
    298 		perror(argv[0]);
    299 		exit(1);
    300 	}
    301 	getlabel(sd);
    302 	changed = getparts(sd, FIRSTPART, MBR_BBSECTOR, 0, verbose);
    303 
    304 	if (verbose) {
    305 		putchar('\n');
    306 		showpartitions(stdout, &label, 0);
    307 		putchar('\n');
    308 	}
    309 	if (write) {
    310 		if (! changed && ! force)
    311 			printf("No change; not updating disk label.\n");
    312 		else {
    313 			if (verbose)
    314 				printf("Updating in-core %sdisk label.\n",
    315 				    raw ? "and on-disk " : "");
    316 			setlabel(sd, raw);
    317 		}
    318 	} else {
    319 		printf("Not updating disk label.\n");
    320 	}
    321 	close(sd);
    322 	return (0);
    323 }
    324