Home | History | Annotate | Line # | Download | only in mbrlabel
mbrlabel.c revision 1.14 
      1 /*	$NetBSD: mbrlabel.c,v 1.14 2001/02/04 20:08:24 christos 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 1.14 2001/02/04 20:08:24 christos 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 extern char *__progname;
     67 
     68 void
     69 getlabel(int sd)
     70 {
     71 
     72 	if (ioctl(sd, DIOCGDINFO, &label) < 0) {
     73 		perror("get label");
     74 		exit(1);
     75 	}
     76 	/*
     77 	 * Some ports seem to not set the number of partitions
     78 	 * correctly, albeit they seem to set the raw partiton ok!
     79 	 */
     80 	if (label.d_npartitions <= RAW_PART)
     81 		label.d_npartitions = RAW_PART + 1;
     82 }
     83 
     84 void
     85 setlabel(int sd, int doraw)
     86 {
     87 
     88 	label.d_checksum = 0;
     89 	label.d_checksum = dkcksum(&label);
     90 	if (ioctl(sd, doraw ? DIOCWDINFO : DIOCSDINFO, &label) < 0) {
     91 		perror("set label");
     92 		exit(1);
     93 	}
     94 }
     95 
     96 static struct typetab {
     97 	int mbrtype;
     98 	int nbsdtype;
     99 } typetable[] = {
    100 	{ MBR_PTYPE_386BSD,	FS_BSDFFS },
    101 	{ MBR_PTYPE_FAT12,	FS_MSDOS },
    102 	{ MBR_PTYPE_FAT16B,	FS_MSDOS },
    103 	{ MBR_PTYPE_FAT16L,	FS_MSDOS },
    104 	{ MBR_PTYPE_FAT16S,	FS_MSDOS },
    105 	{ MBR_PTYPE_FAT32,	FS_MSDOS },
    106 	{ MBR_PTYPE_FAT32L,	FS_MSDOS },
    107 	{ MBR_PTYPE_LNXEXT2,	FS_EX2FS },
    108 	{ MBR_PTYPE_LNXSWAP,	FS_SWAP },
    109 	{ MBR_PTYPE_NETBSD,	FS_BSDFFS },
    110 	{ MBR_PTYPE_NTFS,	FS_NTFS },
    111 	{ 0, 0 }
    112 };
    113 
    114 int
    115 nbsdtype(int type)
    116 {
    117 	struct typetab *tt;
    118 
    119 	for (tt = typetable; tt->mbrtype; tt++)
    120 		if (tt->mbrtype == type)
    121 			return (tt->nbsdtype);
    122 	return (FS_OTHER);
    123 }
    124 
    125 u_int32_t
    126 getlong(void *p)
    127 {
    128 	unsigned char *cp = p;
    129 
    130 	return (cp[0] | (cp[1] << 8) | (cp[2] << 16) | (cp[3] << 24));
    131 }
    132 
    133 int
    134 getparts(int sd, int np, u_int32_t off, u_int32_t extoff, int verbose)
    135 {
    136 	unsigned char		buf[DEV_BSIZE];
    137 	struct mbr_partition	parts[NMBRPART];
    138 	struct partition	npe;
    139 	off_t			loff;
    140 	int			i, j, unused, changed;
    141 
    142 	changed = 0;
    143 	loff = (off_t)off * DEV_BSIZE;
    144 
    145 	if (lseek(sd, loff, SEEK_SET) != loff) {
    146 		perror("seek label");
    147 		exit(1);
    148 	}
    149 	if (read(sd, buf, DEV_BSIZE) != DEV_BSIZE) {
    150 		perror("read label");
    151 		exit(1);
    152 	}
    153 	if (buf[0x1fe] != 0x55 || buf[0x1ff] != 0xaa)
    154 		return (changed);
    155 	memcpy(parts, buf + MBR_PARTOFF, sizeof parts);
    156 
    157 				/* scan partition table */
    158 	for (i = 0; i < NMBRPART; i++) {
    159 		if (parts[i].mbrp_typ == 0 ||
    160 				/* extended partitions are handled below */
    161 		    MBR_IS_EXTENDED(parts[i].mbrp_typ))
    162 			continue;
    163 
    164 		memset((void *)&npe, 0, sizeof(npe));
    165 		npe.p_size = getlong(&parts[i].mbrp_size);
    166 		npe.p_offset = getlong(&parts[i].mbrp_start) + off;
    167 		npe.p_fstype = nbsdtype(parts[i].mbrp_typ);
    168 
    169 				/* find existing entry, or first free slot */
    170 		unused = -1;	/* flag as no free slot */
    171 		if (verbose)
    172 			printf(
    173 			    "Found %s partition; size %u (%u MB), offset %u\n",
    174 			    fstypenames[npe.p_fstype],
    175 			    npe.p_size, npe.p_size / 2048, npe.p_offset);
    176 		for (j = 0; j < label.d_npartitions; j++) {
    177 			struct partition *lpe;
    178 
    179 			if (j == RAW_PART)
    180 				continue;
    181 			lpe = &label.d_partitions[j];
    182 			if (lpe->p_size == npe.p_size &&
    183 			    lpe->p_offset == npe.p_offset
    184 #ifdef notyet
    185 			    && (lpe->p_fstype == npe.p_fstype ||
    186 			     lpe->p_fstype == FS_UNUSED) */
    187 #endif
    188 			     ) {
    189 				if (verbose)
    190 					printf(
    191 			    "  skipping existing %s partition at slot %c.\n",
    192 					    fstypenames[lpe->p_fstype],
    193 					    j + 'a');
    194 				unused = -2;	/* flag as existing */
    195 				break;
    196 			}
    197 			if (unused == -1 && lpe->p_size == 0 &&
    198 			    lpe->p_fstype == FS_UNUSED)
    199 				unused = j;
    200 		}
    201 		if (unused == -2)
    202 			continue;	/* entry exists, skip... */
    203 		if (unused == -1) {
    204 			if (label.d_npartitions < MAXPARTITIONS) {
    205 				unused = label.d_npartitions;
    206 				label.d_npartitions++;
    207 			} else {
    208 				printf(
    209 				"  WARNING: no slots free for %s partition.\n",
    210 				    fstypenames[npe.p_fstype]);
    211 				continue;
    212 			}
    213 		}
    214 
    215 		if (verbose)
    216 			printf("  adding %s partition to slot %c.\n",
    217 			    fstypenames[npe.p_fstype], unused + 'a');
    218 		switch (npe.p_fstype) {
    219 		case FS_BSDFFS:
    220 			npe.p_size = 16384;	/* XXX */
    221 			npe.p_fsize = 1024;
    222 			npe.p_frag = 8;
    223 			npe.p_cpg = 16;
    224 			break;
    225 #ifdef	__does_not_happen__
    226 		case FS_BSDLFS:
    227 			npe.p_size = 16384;	/* XXX */
    228 			npe.p_fsize = 1024;
    229 			npe.p_frag = 8;
    230 			npe.p_sgs = XXX;
    231 			break;
    232 #endif
    233 		}
    234 		changed++;
    235 		label.d_partitions[unused] = npe;
    236 	}
    237 
    238 				/* recursively scan extended partitions */
    239 	for (i = 0; i < NMBRPART; i++) {
    240 		u_int32_t poff;
    241 
    242 		if (MBR_IS_EXTENDED(parts[i].mbrp_typ)) {
    243 			poff = getlong(&parts[i].mbrp_start) + extoff;
    244 			changed += getparts(sd, np, poff,
    245 			    extoff ? extoff : poff, verbose);
    246 		}
    247 	}
    248 	return (changed);
    249 }
    250 
    251 void
    252 usage(void)
    253 {
    254 	fprintf(stderr, "Usage: %s [-fqrw] rawdisk\n", __progname);
    255 	exit(1);
    256 }
    257 
    258 
    259 int
    260 main(int argc, char **argv)
    261 {
    262 	int	sd, ch, changed;
    263 	char	name[MAXPATHLEN];
    264 	int	force;			/* force label update */
    265 	int	raw;			/* update on-disk label as well */
    266 	int	verbose;		/* verbose output */
    267 	int	write;			/* update in-core label if changed */
    268 
    269 	force = 0;
    270 	raw = 0;
    271 	verbose = 1;
    272 	write = 0;
    273 	while ((ch = getopt(argc, argv, "fqrw")) != -1) {
    274 		switch (ch) {
    275 		case 'f':
    276 			force = 1;
    277 			break;
    278 		case 'q':
    279 			verbose = 0;
    280 			break;
    281 		case 'r':
    282 			raw = 1;
    283 			break;
    284 		case 'w':
    285 			write = 1;
    286 			break;
    287 		default:
    288 			usage();
    289 		}
    290 	}
    291 	argc -= optind;
    292 	argv += optind;
    293 	if (argc != 1)
    294 		usage();
    295 
    296 	if ((sd = opendisk(argv[0], O_RDWR, name, MAXPATHLEN, 0)) < 0) {
    297 		perror(argv[0]);
    298 		exit(1);
    299 	}
    300 	getlabel(sd);
    301 	changed = getparts(sd, FIRSTPART, MBR_BBSECTOR, 0, verbose);
    302 
    303 	if (verbose) {
    304 		putchar('\n');
    305 		showpartitions(stdout, &label, 0);
    306 		putchar('\n');
    307 	}
    308 	if (write) {
    309 		if (! changed && ! force)
    310 			printf("No change; not updating disk label.\n");
    311 		else {
    312 			if (verbose)
    313 				printf("Updating in-core %sdisk label.\n",
    314 				    raw ? "and on-disk " : "");
    315 			setlabel(sd, raw);
    316 		}
    317 	} else {
    318 		printf("Not updating disk label.\n");
    319 	}
    320 	close(sd);
    321 	return (0);
    322 }
    323