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mbrlabel.c revision 1.19 
      1 /*	$NetBSD: mbrlabel.c,v 1.19 2002/02/07 02:14:02 ross 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 1.19 2002/02/07 02:14:02 ross 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], O_RDWR, name, (size_t)MAXPATHLEN, 0)) < 0) {
    303 		perror(argv[0]);
    304 		exit(1);
    305 	}
    306 	getlabel(sd);
    307 	changed = getparts(sd, MBR_BBSECTOR, 0, verbose);
    308 
    309 	if (verbose) {
    310 		putchar('\n');
    311 		showpartitions(stdout, &label, 0);
    312 		putchar('\n');
    313 	}
    314 	if (write_it) {
    315 		if (! changed && ! force)
    316 			printf("No change; not updating disk label.\n");
    317 		else {
    318 			if (verbose)
    319 				printf("Updating in-core %sdisk label.\n",
    320 				    raw ? "and on-disk " : "");
    321 			setlabel(sd, raw);
    322 		}
    323 	} else {
    324 		printf("Not updating disk label.\n");
    325 	}
    326 	close(sd);
    327 	return (0);
    328 }
    329