disksubr.c revision 1.50
1/* $NetBSD: disksubr.c,v 1.50 2009/03/14 14:46:04 dsl Exp $ */ 2 3/* 4 * Copyright (c) 1982, 1986, 1988 Regents of the University of California. 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. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * @(#)ufs_disksubr.c 7.16 (Berkeley) 5/4/91 32 */ 33 34#include <sys/cdefs.h> 35__KERNEL_RCSID(0, "$NetBSD: disksubr.c,v 1.50 2009/03/14 14:46:04 dsl Exp $"); 36 37#include <sys/param.h> 38#include <sys/systm.h> 39#include <sys/buf.h> 40#include <sys/disk.h> 41#include <sys/disklabel.h> 42 43#include <dev/dec/dec_boot.h> 44#include <ufs/ufs/dinode.h> /* XXX for fs.h */ 45#include <ufs/ffs/fs.h> /* XXX for BBSIZE & SBSIZE */ 46 47const char *compat_label(dev_t dev, void (*strat)(struct buf *bp), 48 struct disklabel *lp, struct cpu_disklabel *osdep); /* XXX */ 49 50/* 51 * Attempt to read a disk label from a device 52 * using the indicated strategy routine. 53 * The label must be partly set up before this: 54 * secpercyl and anything required in the strategy routine 55 * (e.g., sector size) must be filled in before calling us. 56 * Returns null on success and an error string on failure. 57 */ 58const char * 59readdisklabel(dev, strat, lp, osdep) 60 dev_t dev; 61 void (*strat)(struct buf *bp); 62 struct disklabel *lp; 63 struct cpu_disklabel *osdep; 64{ 65 struct buf *bp; 66 struct disklabel *dlp; 67 const char *msg = NULL; 68 69 if (lp->d_secperunit == 0) 70 lp->d_secperunit = 0x1fffffff; 71 lp->d_npartitions = 1; 72 if (lp->d_partitions[0].p_size == 0) 73 lp->d_partitions[0].p_size = 0x1fffffff; 74 lp->d_partitions[0].p_offset = 0; 75 76 bp = geteblk((int)lp->d_secsize); 77 bp->b_dev = dev; 78 bp->b_blkno = LABELSECTOR; 79 bp->b_bcount = lp->d_secsize; 80 bp->b_flags |= B_READ; 81 bp->b_cylinder = LABELSECTOR / lp->d_secpercyl; 82 (*strat)(bp); 83 if (biowait(bp)) { 84 msg = "I/O error"; 85 } else for (dlp = (struct disklabel *)bp->b_data; 86 dlp <= (struct disklabel *) 87 ((char *)bp->b_data + DEV_BSIZE - sizeof(*dlp)); 88 dlp = (struct disklabel *)((char *)dlp + sizeof(long))) { 89 if (dlp->d_magic != DISKMAGIC || dlp->d_magic2 != DISKMAGIC) { 90 if (msg == NULL) 91 msg = "no disk label"; 92 } else if (dlp->d_npartitions > MAXPARTITIONS || 93 dkcksum(dlp) != 0) 94 msg = "disk label corrupted"; 95 else { 96 *lp = *dlp; 97 msg = NULL; 98 break; 99 } 100 } 101 brelse(bp, 0); 102 /* 103 * If no NetBSD label was found, check for an Ultrix label and 104 * construct tne incore label from the Ultrix partition information. 105 */ 106 if (msg != NULL) { 107 msg = compat_label(dev, strat, lp, osdep); 108 if (msg == NULL) { 109 printf("WARNING: using Ultrix partition information\n"); 110 /* set geometry? */ 111 } 112 } 113/* XXX If no NetBSD label or Ultrix label found, generate default label here */ 114 return (msg); 115} 116 117/* 118 * Given a buffer bp, try and interpret it as an Ultrix disk label, 119 * putting the partition info into a native NetBSD label 120 */ 121const char * 122compat_label(dev, strat, lp, osdep) 123 dev_t dev; 124 void (*strat)(struct buf *bp); 125 struct disklabel *lp; 126 struct cpu_disklabel *osdep; 127{ 128 dec_disklabel *dlp; 129 struct buf *bp = NULL; 130 const char *msg = NULL; 131 132 bp = geteblk((int)lp->d_secsize); 133 bp->b_dev = dev; 134 bp->b_blkno = DEC_LABEL_SECTOR; 135 bp->b_bcount = lp->d_secsize; 136 bp->b_flags |= B_READ; 137 bp->b_cylinder = DEC_LABEL_SECTOR / lp->d_secpercyl; 138 (*strat)(bp); 139 140 if (biowait(bp)) { 141 msg = "I/O error"; 142 goto done; 143 } 144 145 for (dlp = (dec_disklabel *)bp->b_data; 146 dlp <= (dec_disklabel *) 147 ((char *)bp->b_data + DEV_BSIZE - sizeof(*dlp)); 148 dlp = (dec_disklabel *)((char *)dlp + sizeof(long))) { 149 150 int part; 151 152 if (dlp->magic != DEC_LABEL_MAGIC) { 153 printf("label: %x\n",dlp->magic); 154 msg = ((msg != NULL) ? msg: "no disk label"); 155 goto done; 156 } 157 158#ifdef DIAGNOSTIC 159/*XXX*/ printf("Interpreting Ultrix label\n"); 160#endif 161 162 lp->d_magic = DEC_LABEL_MAGIC; 163 lp->d_npartitions = 0; 164 strncpy(lp->d_packname, "Ultrix label", 16); 165 lp->d_rpm = 3600; 166 lp->d_interleave = 1; 167 lp->d_flags = 0; 168 lp->d_bbsize = BBSIZE; 169 lp->d_sbsize = SBLOCKSIZE; 170 for (part = 0; 171 part <((MAXPARTITIONS<DEC_NUM_DISK_PARTS) ? 172 MAXPARTITIONS : DEC_NUM_DISK_PARTS); 173 part++) { 174 lp->d_partitions[part].p_size = dlp->map[part].num_blocks; 175 lp->d_partitions[part].p_offset = dlp->map[part].start_block; 176 lp->d_partitions[part].p_fsize = 1024; 177 lp->d_partitions[part].p_fstype = 178 (part==1) ? FS_SWAP : FS_BSDFFS; 179 lp->d_npartitions += 1; 180 181#ifdef DIAGNOSTIC 182 printf(" Ultrix label rz%d%c: start %d len %d\n", 183 DISKUNIT(dev), "abcdefgh"[part], 184 lp->d_partitions[part].p_offset, 185 lp->d_partitions[part].p_size); 186#endif 187 } 188 break; 189 } 190 191done: 192 brelse(bp, 0); 193 return (msg); 194} 195 196/* 197 * Check new disk label for sensibility 198 * before setting it. 199 */ 200int 201setdisklabel(olp, nlp, openmask, osdep) 202 struct disklabel *olp, *nlp; 203 u_long openmask; 204 struct cpu_disklabel *osdep; 205{ 206 int i; 207 struct partition *opp, *npp; 208 209 if (nlp->d_magic != DISKMAGIC || nlp->d_magic2 != DISKMAGIC || 210 dkcksum(nlp) != 0) 211 return (EINVAL); 212 while ((i = ffs(openmask)) != 0) { 213 i--; 214 openmask &= ~(1 << i); 215 if (nlp->d_npartitions <= i) 216 return (EBUSY); 217 opp = &olp->d_partitions[i]; 218 npp = &nlp->d_partitions[i]; 219 if (npp->p_offset != opp->p_offset || npp->p_size < opp->p_size) 220 return (EBUSY); 221 /* 222 * Copy internally-set partition information 223 * if new label doesn't include it. XXX 224 */ 225 if (npp->p_fstype == FS_UNUSED && opp->p_fstype != FS_UNUSED) { 226 npp->p_fstype = opp->p_fstype; 227 npp->p_fsize = opp->p_fsize; 228 npp->p_frag = opp->p_frag; 229 npp->p_cpg = opp->p_cpg; 230 } 231 } 232 nlp->d_checksum = 0; 233 nlp->d_checksum = dkcksum(nlp); 234 *olp = *nlp; 235 return (0); 236} 237 238/* 239 * Write disk label back to device after modification. 240 */ 241int 242writedisklabel(dev, strat, lp, osdep) 243 dev_t dev; 244 void (*strat)(struct buf *bp); 245 struct disklabel *lp; 246 struct cpu_disklabel *osdep; 247{ 248 struct buf *bp; 249 struct disklabel *dlp; 250 int labelpart; 251 int error = 0; 252 253 labelpart = DISKPART(dev); 254 if (lp->d_partitions[labelpart].p_offset != 0) { 255 if (lp->d_partitions[0].p_offset != 0) 256 return (EXDEV); /* not quite right */ 257 labelpart = 0; 258 } 259 bp = geteblk((int)lp->d_secsize); 260 bp->b_dev = makedev(major(dev), DISKMINOR(DISKUNIT(dev), labelpart)); 261 bp->b_blkno = LABELSECTOR; 262 bp->b_bcount = lp->d_secsize; 263 bp->b_flags |= B_READ; 264 (*strat)(bp); 265 if ((error = biowait(bp)) != 0) 266 goto done; 267 for (dlp = (struct disklabel *)bp->b_data; 268 dlp <= (struct disklabel *) 269 ((char *)bp->b_data + lp->d_secsize - sizeof(*dlp)); 270 dlp = (struct disklabel *)((char *)dlp + sizeof(long))) { 271 if (dlp->d_magic == DISKMAGIC && dlp->d_magic2 == DISKMAGIC && 272 dkcksum(dlp) == 0) { 273 *dlp = *lp; 274 bp->b_oflags &= ~(BO_DONE); 275 bp->b_flags &= ~(B_READ); 276 bp->b_flags |= B_WRITE; 277 (*strat)(bp); 278 error = biowait(bp); 279 goto done; 280 } 281 } 282 error = ESRCH; 283done: 284 brelse(bp, 0); 285 return (error); 286} 287