setup.c revision 1.15
1/* $OpenBSD: setup.c,v 1.15 2007/09/02 15:19:23 deraadt Exp $ */ 2/* $NetBSD: setup.c,v 1.1 1997/06/11 11:22:01 bouyer Exp $ */ 3 4/* 5 * Copyright (c) 1997 Manuel Bouyer. 6 * Copyright (c) 1980, 1986, 1993 7 * The Regents of the University of California. All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34#define DKTYPENAMES 35#include <sys/param.h> 36#include <sys/time.h> 37#include <ufs/ext2fs/ext2fs_dinode.h> 38#include <ufs/ext2fs/ext2fs.h> 39#include <sys/stat.h> 40#include <sys/ioctl.h> 41#include <sys/disklabel.h> 42#include <sys/file.h> 43 44#include <errno.h> 45#include <fcntl.h> 46#include <stdio.h> 47#include <stdlib.h> 48#include <string.h> 49#include <ctype.h> 50 51#include "fsck.h" 52#include "extern.h" 53#include "fsutil.h" 54 55#define POWEROF2(num) (((num) & ((num) - 1)) == 0) 56 57void badsb(int, char *); 58int calcsb(char *, int, struct m_ext2fs *); 59static struct disklabel *getdisklabel(char *, int); 60static int readsb(int); 61 62int 63setup(char *dev) 64{ 65 long cg, asked, i; 66 long bmapsize; 67 struct disklabel *lp; 68 off_t sizepb; 69 struct stat statb; 70 struct m_ext2fs proto; 71 int doskipclean; 72 u_int64_t maxfilesize; 73 74 havesb = 0; 75 fswritefd = -1; 76 doskipclean = skipclean; 77 if (stat(dev, &statb) < 0) { 78 printf("Can't stat %s: %s\n", dev, strerror(errno)); 79 return (0); 80 } 81 if (!S_ISCHR(statb.st_mode)) { 82 pfatal("%s is not a character device", dev); 83 if (reply("CONTINUE") == 0) 84 return (0); 85 } 86 if ((fsreadfd = open(dev, O_RDONLY)) < 0) { 87 printf("Can't open %s: %s\n", dev, strerror(errno)); 88 return (0); 89 } 90 if (preen == 0) 91 printf("** %s", dev); 92 if (nflag || (fswritefd = open(dev, O_WRONLY)) < 0) { 93 fswritefd = -1; 94 if (preen) 95 pfatal("NO WRITE ACCESS"); 96 printf(" (NO WRITE)"); 97 } 98 if (preen == 0) 99 printf("\n"); 100 fsmodified = 0; 101 lfdir = 0; 102 initbarea(&sblk); 103 initbarea(&asblk); 104 sblk.b_un.b_buf = malloc(SBSIZE); 105 asblk.b_un.b_buf = malloc(SBSIZE); 106 if (sblk.b_un.b_buf == NULL || asblk.b_un.b_buf == NULL) 107 errexit("cannot allocate space for superblock\n"); 108 if ((lp = getdisklabel((char *)NULL, fsreadfd)) != NULL) 109 dev_bsize = secsize = lp->d_secsize; 110 else 111 dev_bsize = secsize = DEV_BSIZE; 112 /* 113 * Read in the superblock, looking for alternates if necessary 114 */ 115 if (readsb(1) == 0) { 116 if (bflag || preen || calcsb(dev, fsreadfd, &proto) == 0) 117 return(0); 118 if (reply("LOOK FOR ALTERNATE SUPERBLOCKS") == 0) 119 return (0); 120 for (cg = 1; cg < proto.e2fs_ncg; cg++) { 121 bflag = fsbtodb(&proto, 122 cg * proto.e2fs.e2fs_bpg + proto.e2fs.e2fs_first_dblock); 123 if (readsb(0) != 0) 124 break; 125 } 126 if (cg >= proto.e2fs_ncg) { 127 printf("%s %s\n%s %s\n%s %s\n", 128 "SEARCH FOR ALTERNATE SUPER-BLOCK", 129 "FAILED. YOU MUST USE THE", 130 "-b OPTION TO FSCK_FFS TO SPECIFY THE", 131 "LOCATION OF AN ALTERNATE", 132 "SUPER-BLOCK TO SUPPLY NEEDED", 133 "INFORMATION; SEE fsck_ext2fs(8)."); 134 return(0); 135 } 136 doskipclean = 0; 137 pwarn("USING ALTERNATE SUPERBLOCK AT %d\n", bflag); 138 } 139 if (debug) 140 printf("state = %d\n", sblock.e2fs.e2fs_state); 141 if (sblock.e2fs.e2fs_state == E2FS_ISCLEAN) { 142 if (doskipclean) { 143 pwarn("%sile system is clean; not checking\n", 144 preen ? "f" : "** F"); 145 return (-1); 146 } 147 if (!preen) 148 pwarn("** File system is already clean\n"); 149 } 150 maxfsblock = sblock.e2fs.e2fs_bcount; 151 maxino = sblock.e2fs_ncg * sblock.e2fs.e2fs_ipg; 152 sizepb = sblock.e2fs_bsize; 153 maxfilesize = sblock.e2fs_bsize * NDADDR - 1; 154 for (i = 0; i < NIADDR; i++) { 155 sizepb *= NINDIR(&sblock); 156 maxfilesize += sizepb; 157 } 158 /* 159 * Check and potentially fix certain fields in the super block. 160 */ 161 if ((sblock.e2fs.e2fs_rbcount < 0) || 162 (sblock.e2fs.e2fs_rbcount > sblock.e2fs.e2fs_bcount)) { 163 pfatal("IMPOSSIBLE RESERVED BLOCK COUNT=%d IN SUPERBLOCK", 164 sblock.e2fs.e2fs_rbcount); 165 if (reply("SET TO DEFAULT") == 1) { 166 sblock.e2fs.e2fs_rbcount = sblock.e2fs.e2fs_bcount * 0.1; 167 sbdirty(); 168 dirty(&asblk); 169 } 170 } 171 if (sblock.e2fs.e2fs_bpg != sblock.e2fs.e2fs_fpg) { 172 pfatal("WRONG FPG=%d (BPG=%d) IN SUPERBLOCK", 173 sblock.e2fs.e2fs_fpg, sblock.e2fs.e2fs_bpg); 174 return 0; 175 } 176 if (asblk.b_dirty && !bflag) { 177 copyback_sb(&asblk); 178 flush(fswritefd, &asblk); 179 } 180 /* 181 * read in the summary info. 182 */ 183 184 sblock.e2fs_gd = calloc(sblock.e2fs_ngdb, sblock.e2fs_bsize); 185 if (sblock.e2fs_gd == NULL) 186 errexit("out of memory\n"); 187 asked = 0; 188 for (i=0; i < sblock.e2fs_ngdb; i++) { 189 if (bread(fsreadfd,(char *) 190 &sblock.e2fs_gd[i* sblock.e2fs_bsize / sizeof(struct ext2_gd)], 191 fsbtodb(&sblock, ((sblock.e2fs_bsize>1024)?0:1)+i+1), 192 sblock.e2fs_bsize) != 0 && !asked) { 193 pfatal("BAD SUMMARY INFORMATION"); 194 if (reply("CONTINUE") == 0) 195 errexit("%s\n", ""); 196 asked++; 197 } 198 } 199 /* 200 * allocate and initialize the necessary maps 201 */ 202 bmapsize = roundup(howmany(maxfsblock, NBBY), sizeof(int16_t)); 203 blockmap = calloc((unsigned)bmapsize, sizeof (char)); 204 if (blockmap == NULL) { 205 printf("cannot alloc %u bytes for blockmap\n", 206 (unsigned)bmapsize); 207 goto badsblabel; 208 } 209 statemap = calloc((unsigned)(maxino + 2), sizeof(char)); 210 if (statemap == NULL) { 211 printf("cannot alloc %u bytes for statemap\n", 212 (unsigned)(maxino + 1)); 213 goto badsblabel; 214 } 215 typemap = calloc((unsigned)(maxino + 1), sizeof(char)); 216 if (typemap == NULL) { 217 printf("cannot alloc %u bytes for typemap\n", 218 (unsigned)(maxino + 1)); 219 goto badsblabel; 220 } 221 lncntp = (int16_t *)calloc((unsigned)(maxino + 1), sizeof(int16_t)); 222 if (lncntp == NULL) { 223 printf("cannot alloc %u bytes for lncntp\n", 224 (unsigned)((maxino + 1) * sizeof(int16_t))); 225 goto badsblabel; 226 } 227 for (numdirs = 0, cg = 0; cg < sblock.e2fs_ncg; cg++) { 228 numdirs += fs2h16(sblock.e2fs_gd[cg].ext2bgd_ndirs); 229 } 230 inplast = 0; 231 listmax = numdirs + 10; 232 inpsort = (struct inoinfo **)calloc((unsigned)listmax, 233 sizeof(struct inoinfo *)); 234 inphead = (struct inoinfo **)calloc((unsigned)numdirs, 235 sizeof(struct inoinfo *)); 236 if (inpsort == NULL || inphead == NULL) { 237 printf("cannot alloc %u bytes for inphead\n", 238 (unsigned)(numdirs * sizeof(struct inoinfo *))); 239 goto badsblabel; 240 } 241 bufinit(); 242 return (1); 243 244badsblabel: 245 ckfini(0); 246 return (0); 247} 248 249/* 250 * Read in the super block and its summary info. 251 */ 252static int 253readsb(int listerr) 254{ 255 daddr_t super = bflag ? bflag : SBOFF / dev_bsize; 256 257 if (bread(fsreadfd, (char *)sblk.b_un.b_fs, super, (long)SBSIZE) != 0) 258 return (0); 259 sblk.b_bno = super; 260 sblk.b_size = SBSIZE; 261 262 /* Copy the superblock in memory */ 263 e2fs_sbload(sblk.b_un.b_fs, &sblock.e2fs); 264 265 /* 266 * run a few consistency checks of the super block 267 */ 268 if (sblock.e2fs.e2fs_magic != E2FS_MAGIC) { 269 badsb(listerr, "MAGIC NUMBER WRONG"); return (0); 270 } 271 if (sblock.e2fs.e2fs_log_bsize > 2) { 272 badsb(listerr, "BAD LOG_BSIZE"); return (0); 273 } 274 275 /* compute the dynamic fields of the in-memory sb */ 276 /* compute dynamic sb infos */ 277 sblock.e2fs_ncg = 278 howmany(sblock.e2fs.e2fs_bcount - sblock.e2fs.e2fs_first_dblock, 279 sblock.e2fs.e2fs_bpg); 280 /* XXX assume hw bsize = 512 */ 281 sblock.e2fs_fsbtodb = sblock.e2fs.e2fs_log_bsize + 1; 282 sblock.e2fs_bsize = 1024 << sblock.e2fs.e2fs_log_bsize; 283 sblock.e2fs_bshift = LOG_MINBSIZE + sblock.e2fs.e2fs_log_bsize; 284 sblock.e2fs_qbmask = sblock.e2fs_bsize - 1; 285 sblock.e2fs_bmask = ~sblock.e2fs_qbmask; 286 sblock.e2fs_ngdb = howmany(sblock.e2fs_ncg, 287 sblock.e2fs_bsize / sizeof(struct ext2_gd)); 288 sblock.e2fs_ipb = sblock.e2fs_bsize / sizeof(struct ext2fs_dinode); 289 sblock.e2fs_itpg = sblock.e2fs.e2fs_ipg/sblock.e2fs_ipb; 290 291 /* 292 * Compute block size that the filesystem is based on, 293 * according to fsbtodb, and adjust superblock block number 294 * so we can tell if this is an alternate later. 295 */ 296 super *= dev_bsize; 297 dev_bsize = sblock.e2fs_bsize / fsbtodb(&sblock, 1); 298 sblk.b_bno = super / dev_bsize; 299 300 getblk(&asblk, 1 * sblock.e2fs.e2fs_bpg + sblock.e2fs.e2fs_first_dblock, 301 (long)SBSIZE); 302 if (asblk.b_errs) 303 return (0); 304 if (bflag) { 305 havesb = 1; 306 return (1); 307 } 308 309 /* 310 * Set all possible fields that could differ, then do check 311 * of whole super block against an alternate super block. 312 * When an alternate super-block is specified this check is skipped. 313 */ 314 asblk.b_un.b_fs->e2fs_rbcount = sblk.b_un.b_fs->e2fs_rbcount; 315 asblk.b_un.b_fs->e2fs_fbcount = sblk.b_un.b_fs->e2fs_fbcount; 316 asblk.b_un.b_fs->e2fs_ficount = sblk.b_un.b_fs->e2fs_ficount; 317 asblk.b_un.b_fs->e2fs_mtime = sblk.b_un.b_fs->e2fs_mtime; 318 asblk.b_un.b_fs->e2fs_wtime = sblk.b_un.b_fs->e2fs_wtime; 319 asblk.b_un.b_fs->e2fs_mnt_count = sblk.b_un.b_fs->e2fs_mnt_count; 320 asblk.b_un.b_fs->e2fs_max_mnt_count = sblk.b_un.b_fs->e2fs_max_mnt_count; 321 asblk.b_un.b_fs->e2fs_state = sblk.b_un.b_fs->e2fs_state; 322 asblk.b_un.b_fs->e2fs_beh = sblk.b_un.b_fs->e2fs_beh; 323 asblk.b_un.b_fs->e2fs_lastfsck = sblk.b_un.b_fs->e2fs_lastfsck; 324 asblk.b_un.b_fs->e2fs_fsckintv = sblk.b_un.b_fs->e2fs_fsckintv; 325 asblk.b_un.b_fs->e2fs_ruid = sblk.b_un.b_fs->e2fs_ruid; 326 asblk.b_un.b_fs->e2fs_rgid = sblk.b_un.b_fs->e2fs_rgid; 327 asblk.b_un.b_fs->e2fs_block_group_nr = 328 sblk.b_un.b_fs->e2fs_block_group_nr; 329 asblk.b_un.b_fs->e2fs_features_rocompat &= ~EXT2F_ROCOMPAT_LARGEFILE; 330 asblk.b_un.b_fs->e2fs_features_rocompat |= 331 sblk.b_un.b_fs->e2fs_features_rocompat & EXT2F_ROCOMPAT_LARGEFILE; 332 if (sblock.e2fs.e2fs_rev > E2FS_REV0 && 333 ((sblock.e2fs.e2fs_features_incompat & ~EXT2F_INCOMPAT_SUPP) || 334 (sblock.e2fs.e2fs_features_rocompat & ~EXT2F_ROCOMPAT_SUPP))) { 335 if (debug) { 336 printf("compat 0x%08x, incompat 0x%08x, compat_ro " 337 "0x%08x\n", 338 sblock.e2fs.e2fs_features_compat, 339 sblock.e2fs.e2fs_features_incompat, 340 sblock.e2fs.e2fs_features_rocompat); 341 } 342 badsb(listerr,"INCOMPATIBLE FEATURE BITS IN SUPER BLOCK"); 343 return 0; 344 } 345 if (memcmp(sblk.b_un.b_fs, asblk.b_un.b_fs, SBSIZE)) { 346 if (debug) { 347 u_int32_t *nlp, *olp, *endlp; 348 349 printf("superblock mismatches\n"); 350 nlp = (u_int32_t *)asblk.b_un.b_fs; 351 olp = (u_int32_t *)sblk.b_un.b_fs; 352 endlp = olp + (SBSIZE / sizeof *olp); 353 for ( ; olp < endlp; olp++, nlp++) { 354 if (*olp == *nlp) 355 continue; 356 printf("offset %ld, original %ld, alternate %ld\n", 357 (long)(olp - (u_int32_t *)sblk.b_un.b_fs), 358 (long)fs2h32(*olp), 359 (long)fs2h32(*nlp)); 360 } 361 } 362 badsb(listerr, 363 "VALUES IN SUPER BLOCK DISAGREE WITH THOSE IN FIRST ALTERNATE"); 364 return (0); 365 } 366 havesb = 1; 367 return (1); 368} 369 370void 371copyback_sb(struct bufarea *bp) 372{ 373 /* Copy the in-memory superblock back to buffer */ 374 bp->b_un.b_fs->e2fs_icount = fs2h32(sblock.e2fs.e2fs_icount); 375 bp->b_un.b_fs->e2fs_bcount = fs2h32(sblock.e2fs.e2fs_bcount); 376 bp->b_un.b_fs->e2fs_rbcount = fs2h32(sblock.e2fs.e2fs_rbcount); 377 bp->b_un.b_fs->e2fs_fbcount = fs2h32(sblock.e2fs.e2fs_fbcount); 378 bp->b_un.b_fs->e2fs_ficount = fs2h32(sblock.e2fs.e2fs_ficount); 379 bp->b_un.b_fs->e2fs_first_dblock = 380 fs2h32(sblock.e2fs.e2fs_first_dblock); 381 bp->b_un.b_fs->e2fs_log_bsize = fs2h32(sblock.e2fs.e2fs_log_bsize); 382 bp->b_un.b_fs->e2fs_fsize = fs2h32(sblock.e2fs.e2fs_fsize); 383 bp->b_un.b_fs->e2fs_bpg = fs2h32(sblock.e2fs.e2fs_bpg); 384 bp->b_un.b_fs->e2fs_fpg = fs2h32(sblock.e2fs.e2fs_fpg); 385 bp->b_un.b_fs->e2fs_ipg = fs2h32(sblock.e2fs.e2fs_ipg); 386 bp->b_un.b_fs->e2fs_mtime = fs2h32(sblock.e2fs.e2fs_mtime); 387 bp->b_un.b_fs->e2fs_wtime = fs2h32(sblock.e2fs.e2fs_wtime); 388 bp->b_un.b_fs->e2fs_lastfsck = fs2h32(sblock.e2fs.e2fs_lastfsck); 389 bp->b_un.b_fs->e2fs_fsckintv = fs2h32(sblock.e2fs.e2fs_fsckintv); 390 bp->b_un.b_fs->e2fs_creator = fs2h32(sblock.e2fs.e2fs_creator); 391 bp->b_un.b_fs->e2fs_rev = fs2h32(sblock.e2fs.e2fs_rev); 392 bp->b_un.b_fs->e2fs_mnt_count = fs2h16(sblock.e2fs.e2fs_mnt_count); 393 bp->b_un.b_fs->e2fs_max_mnt_count = 394 fs2h16(sblock.e2fs.e2fs_max_mnt_count); 395 bp->b_un.b_fs->e2fs_magic = fs2h16(sblock.e2fs.e2fs_magic); 396 bp->b_un.b_fs->e2fs_state = fs2h16(sblock.e2fs.e2fs_state); 397 bp->b_un.b_fs->e2fs_beh = fs2h16(sblock.e2fs.e2fs_beh); 398 bp->b_un.b_fs->e2fs_ruid = fs2h16(sblock.e2fs.e2fs_ruid); 399 bp->b_un.b_fs->e2fs_rgid = fs2h16(sblock.e2fs.e2fs_rgid); 400} 401 402void 403badsb(int listerr, char *s) 404{ 405 406 if (!listerr) 407 return; 408 if (preen) 409 printf("%s: ", cdevname()); 410 pfatal("BAD SUPER BLOCK: %s\n", s); 411} 412 413/* 414 * Calculate a prototype superblock based on information in the disk label. 415 * When done the cgsblock macro can be calculated and the fs_ncg field 416 * can be used. Do NOT attempt to use other macros without verifying that 417 * their needed information is available! 418 */ 419 420int 421calcsb(char *dev, int devfd, struct m_ext2fs *fs) 422{ 423 struct disklabel *lp; 424 struct partition *pp; 425 char *cp; 426 427 cp = strchr(dev, '\0') - 1; 428 if ((cp == (char *)-1 || (*cp < 'a' || *cp > 'h')) && !isdigit(*cp)) { 429 pfatal("%s: CANNOT FIGURE OUT FILE SYSTEM PARTITION\n", dev); 430 return (0); 431 } 432 lp = getdisklabel(dev, devfd); 433 if (isdigit(*cp)) 434 pp = &lp->d_partitions[0]; 435 else 436 pp = &lp->d_partitions[*cp - 'a']; 437 if (pp->p_fstype != FS_EXT2FS) { 438 pfatal("%s: NOT LABELED AS A EXT2 FILE SYSTEM (%s)\n", 439 dev, pp->p_fstype < FSMAXTYPES ? 440 fstypenames[pp->p_fstype] : "unknown"); 441 return (0); 442 } 443 memset(fs, 0, sizeof(struct m_ext2fs)); 444 fs->e2fs_bsize = DISKLABELV1_FFS_FSIZE(pp->p_fragblock); /* XXX */ 445 fs->e2fs.e2fs_log_bsize = fs->e2fs_bsize / 1024; 446 fs->e2fs.e2fs_bcount = (pp->p_size * DEV_BSIZE) / fs->e2fs_bsize; 447 fs->e2fs.e2fs_first_dblock = (fs->e2fs.e2fs_log_bsize == 0) ? 1 : 0; 448 fs->e2fs.e2fs_bpg = fs->e2fs_bsize * NBBY; 449 fs->e2fs_bshift = LOG_MINBSIZE + fs->e2fs.e2fs_log_bsize; 450 fs->e2fs_qbmask = fs->e2fs_bsize - 1; 451 fs->e2fs_bmask = ~fs->e2fs_qbmask; 452 fs->e2fs_ncg = 453 howmany(fs->e2fs.e2fs_bcount - fs->e2fs.e2fs_first_dblock, 454 fs->e2fs.e2fs_bpg); 455 fs->e2fs_fsbtodb = fs->e2fs.e2fs_log_bsize + 1; 456 fs->e2fs_ngdb = howmany(fs->e2fs_ncg, 457 fs->e2fs_bsize / sizeof(struct ext2_gd)); 458 459 return (1); 460} 461 462static struct disklabel * 463getdisklabel(char *s, int fd) 464{ 465 static struct disklabel lab; 466 467 if (ioctl(fd, DIOCGDINFO, (char *)&lab) < 0) { 468 if (s == NULL) 469 return ((struct disklabel *)NULL); 470 pwarn("ioctl (GCINFO): %s\n", strerror(errno)); 471 errexit("%s: can't read disk label\n", s); 472 } 473 return (&lab); 474} 475 476daddr_t 477cgoverhead(int c) 478{ 479 int overh; 480 overh = 1 /* block bitmap */ + 481 1 /* inode bitmap */ + 482 sblock.e2fs_itpg; 483 if (sblock.e2fs.e2fs_rev > E2FS_REV0 && 484 sblock.e2fs.e2fs_features_rocompat & EXT2F_ROCOMPAT_SPARSESUPER) { 485 if (cg_has_sb(c) == 0) 486 return overh; 487 } 488 overh += 1 + sblock.e2fs_ngdb; 489 return overh; 490} 491