setup.c revision 1.25
1/* $OpenBSD: setup.c,v 1.25 2015/01/16 06:39:57 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> /* DEV_BSIZE roundup */ 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/dkio.h> 42#include <sys/disklabel.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 secsize = lp->d_secsize; 110 else 111 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 += letoh16(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 daddr32_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 if (sblock.e2fs.e2fs_bpg == 0) { 275 badsb(listerr, "BAD BLOCKS PER GROUP"); return (0); 276 } 277 278 /* compute the dynamic fields of the in-memory sb */ 279 /* compute dynamic sb infos */ 280 sblock.e2fs_ncg = 281 howmany(sblock.e2fs.e2fs_bcount - sblock.e2fs.e2fs_first_dblock, 282 sblock.e2fs.e2fs_bpg); 283 /* XXX assume hw bsize = 512 */ 284 sblock.e2fs_fsbtodb = sblock.e2fs.e2fs_log_bsize + 1; 285 sblock.e2fs_bsize = 1024 << sblock.e2fs.e2fs_log_bsize; 286 sblock.e2fs_bshift = LOG_MINBSIZE + sblock.e2fs.e2fs_log_bsize; 287 sblock.e2fs_qbmask = sblock.e2fs_bsize - 1; 288 sblock.e2fs_bmask = ~sblock.e2fs_qbmask; 289 sblock.e2fs_ngdb = howmany(sblock.e2fs_ncg, 290 sblock.e2fs_bsize / sizeof(struct ext2_gd)); 291 sblock.e2fs_ipb = sblock.e2fs_bsize / sizeof(struct ext2fs_dinode); 292 sblock.e2fs_itpg = sblock.e2fs.e2fs_ipg/sblock.e2fs_ipb; 293 294 /* 295 * Compute block size that the filesystem is based on, 296 * according to fsbtodb, and adjust superblock block number 297 * so we can tell if this is an alternate later. 298 */ 299 sblk.b_bno = super / DEV_BSIZE; 300 301 if (sblock.e2fs_ncg == 1) { 302 /* no alternate superblock; assume it's okey */ 303 havesb = 1; 304 return 1; 305 } 306 307 getblk(&asblk, 1 * sblock.e2fs.e2fs_bpg + sblock.e2fs.e2fs_first_dblock, 308 (long)SBSIZE); 309 if (asblk.b_errs) 310 return (0); 311 if (bflag) { 312 havesb = 1; 313 return (1); 314 } 315 316 /* 317 * Set all possible fields that could differ, then do check 318 * of whole super block against an alternate super block. 319 * When an alternate super-block is specified this check is skipped. 320 */ 321 asblk.b_un.b_fs->e2fs_rbcount = sblk.b_un.b_fs->e2fs_rbcount; 322 asblk.b_un.b_fs->e2fs_fbcount = sblk.b_un.b_fs->e2fs_fbcount; 323 asblk.b_un.b_fs->e2fs_ficount = sblk.b_un.b_fs->e2fs_ficount; 324 asblk.b_un.b_fs->e2fs_mtime = sblk.b_un.b_fs->e2fs_mtime; 325 asblk.b_un.b_fs->e2fs_wtime = sblk.b_un.b_fs->e2fs_wtime; 326 asblk.b_un.b_fs->e2fs_mnt_count = sblk.b_un.b_fs->e2fs_mnt_count; 327 asblk.b_un.b_fs->e2fs_max_mnt_count = sblk.b_un.b_fs->e2fs_max_mnt_count; 328 asblk.b_un.b_fs->e2fs_state = sblk.b_un.b_fs->e2fs_state; 329 asblk.b_un.b_fs->e2fs_beh = sblk.b_un.b_fs->e2fs_beh; 330 asblk.b_un.b_fs->e2fs_lastfsck = sblk.b_un.b_fs->e2fs_lastfsck; 331 asblk.b_un.b_fs->e2fs_fsckintv = sblk.b_un.b_fs->e2fs_fsckintv; 332 asblk.b_un.b_fs->e2fs_ruid = sblk.b_un.b_fs->e2fs_ruid; 333 asblk.b_un.b_fs->e2fs_rgid = sblk.b_un.b_fs->e2fs_rgid; 334 asblk.b_un.b_fs->e2fs_block_group_nr = 335 sblk.b_un.b_fs->e2fs_block_group_nr; 336 asblk.b_un.b_fs->e2fs_features_rocompat &= ~EXT2F_ROCOMPAT_LARGEFILE; 337 asblk.b_un.b_fs->e2fs_features_rocompat |= 338 sblk.b_un.b_fs->e2fs_features_rocompat & EXT2F_ROCOMPAT_LARGEFILE; 339 if (sblock.e2fs.e2fs_rev > E2FS_REV0 && 340 ((sblock.e2fs.e2fs_features_incompat & ~EXT2F_INCOMPAT_SUPP) || 341 (sblock.e2fs.e2fs_features_rocompat & ~EXT2F_ROCOMPAT_SUPP))) { 342 if (debug) { 343 printf("compat 0x%08x, incompat 0x%08x, compat_ro " 344 "0x%08x\n", 345 sblock.e2fs.e2fs_features_compat, 346 sblock.e2fs.e2fs_features_incompat, 347 sblock.e2fs.e2fs_features_rocompat); 348 } 349 badsb(listerr,"INCOMPATIBLE FEATURE BITS IN SUPER BLOCK"); 350 return 0; 351 } 352 if (memcmp(sblk.b_un.b_fs, asblk.b_un.b_fs, SBSIZE)) { 353 if (debug) { 354 u_int32_t *nlp, *olp, *endlp; 355 356 printf("superblock mismatches\n"); 357 nlp = (u_int32_t *)asblk.b_un.b_fs; 358 olp = (u_int32_t *)sblk.b_un.b_fs; 359 endlp = olp + (SBSIZE / sizeof *olp); 360 for ( ; olp < endlp; olp++, nlp++) { 361 if (*olp == *nlp) 362 continue; 363 printf("offset %ld, original %ld, alternate %ld\n", 364 (long)(olp - (u_int32_t *)sblk.b_un.b_fs), 365 (long)letoh32(*olp), 366 (long)letoh32(*nlp)); 367 } 368 } 369 badsb(listerr, 370 "VALUES IN SUPER BLOCK DISAGREE WITH THOSE IN FIRST ALTERNATE"); 371 return (0); 372 } 373 havesb = 1; 374 return (1); 375} 376 377void 378copyback_sb(struct bufarea *bp) 379{ 380 /* Copy the in-memory superblock back to buffer */ 381 bp->b_un.b_fs->e2fs_icount = letoh32(sblock.e2fs.e2fs_icount); 382 bp->b_un.b_fs->e2fs_bcount = letoh32(sblock.e2fs.e2fs_bcount); 383 bp->b_un.b_fs->e2fs_rbcount = letoh32(sblock.e2fs.e2fs_rbcount); 384 bp->b_un.b_fs->e2fs_fbcount = letoh32(sblock.e2fs.e2fs_fbcount); 385 bp->b_un.b_fs->e2fs_ficount = letoh32(sblock.e2fs.e2fs_ficount); 386 bp->b_un.b_fs->e2fs_first_dblock = 387 letoh32(sblock.e2fs.e2fs_first_dblock); 388 bp->b_un.b_fs->e2fs_log_bsize = letoh32(sblock.e2fs.e2fs_log_bsize); 389 bp->b_un.b_fs->e2fs_log_fsize = letoh32(sblock.e2fs.e2fs_log_fsize); 390 bp->b_un.b_fs->e2fs_bpg = letoh32(sblock.e2fs.e2fs_bpg); 391 bp->b_un.b_fs->e2fs_fpg = letoh32(sblock.e2fs.e2fs_fpg); 392 bp->b_un.b_fs->e2fs_ipg = letoh32(sblock.e2fs.e2fs_ipg); 393 bp->b_un.b_fs->e2fs_mtime = letoh32(sblock.e2fs.e2fs_mtime); 394 bp->b_un.b_fs->e2fs_wtime = letoh32(sblock.e2fs.e2fs_wtime); 395 bp->b_un.b_fs->e2fs_lastfsck = letoh32(sblock.e2fs.e2fs_lastfsck); 396 bp->b_un.b_fs->e2fs_fsckintv = letoh32(sblock.e2fs.e2fs_fsckintv); 397 bp->b_un.b_fs->e2fs_creator = letoh32(sblock.e2fs.e2fs_creator); 398 bp->b_un.b_fs->e2fs_rev = letoh32(sblock.e2fs.e2fs_rev); 399 bp->b_un.b_fs->e2fs_mnt_count = letoh16(sblock.e2fs.e2fs_mnt_count); 400 bp->b_un.b_fs->e2fs_max_mnt_count = 401 letoh16(sblock.e2fs.e2fs_max_mnt_count); 402 bp->b_un.b_fs->e2fs_magic = letoh16(sblock.e2fs.e2fs_magic); 403 bp->b_un.b_fs->e2fs_state = letoh16(sblock.e2fs.e2fs_state); 404 bp->b_un.b_fs->e2fs_beh = letoh16(sblock.e2fs.e2fs_beh); 405 bp->b_un.b_fs->e2fs_ruid = letoh16(sblock.e2fs.e2fs_ruid); 406 bp->b_un.b_fs->e2fs_rgid = letoh16(sblock.e2fs.e2fs_rgid); 407} 408 409void 410badsb(int listerr, char *s) 411{ 412 413 if (!listerr) 414 return; 415 if (preen) 416 printf("%s: ", cdevname()); 417 pfatal("BAD SUPER BLOCK: %s\n", s); 418} 419 420/* 421 * Calculate a prototype superblock based on information in the disk label. 422 * When done the cgsblock macro can be calculated and the fs_ncg field 423 * can be used. Do NOT attempt to use other macros without verifying that 424 * their needed information is available! 425 */ 426 427int 428calcsb(char *dev, int devfd, struct m_ext2fs *fs) 429{ 430 struct disklabel *lp; 431 struct partition *pp; 432 char *cp; 433 434 cp = strchr(dev, '\0'); 435 if ((cp == NULL || (cp[-1] < 'a' || cp[-1] >= 'a' + MAXPARTITIONS)) && 436 !isdigit((unsigned char)cp[-1])) { 437 pfatal("%s: CANNOT FIGURE OUT FILE SYSTEM PARTITION\n", dev); 438 return (0); 439 } 440 cp--; 441 lp = getdisklabel(dev, devfd); 442 if (isdigit((unsigned char)*cp)) 443 pp = &lp->d_partitions[0]; 444 else 445 pp = &lp->d_partitions[*cp - 'a']; 446 if (pp->p_fstype != FS_EXT2FS) { 447 pfatal("%s: NOT LABELED AS A EXT2 FILE SYSTEM (%s)\n", 448 dev, pp->p_fstype < FSMAXTYPES ? 449 fstypenames[pp->p_fstype] : "unknown"); 450 return (0); 451 } 452 memset(fs, 0, sizeof(struct m_ext2fs)); 453 fs->e2fs_bsize = DISKLABELV1_FFS_FSIZE(pp->p_fragblock); /* XXX */ 454 fs->e2fs.e2fs_log_bsize = fs->e2fs_bsize / 1024; 455 fs->e2fs.e2fs_bcount = (pp->p_size * DEV_BSIZE) / fs->e2fs_bsize; 456 fs->e2fs.e2fs_first_dblock = (fs->e2fs.e2fs_log_bsize == 0) ? 1 : 0; 457 fs->e2fs.e2fs_bpg = fs->e2fs_bsize * NBBY; 458 fs->e2fs_bshift = LOG_MINBSIZE + fs->e2fs.e2fs_log_bsize; 459 fs->e2fs_qbmask = fs->e2fs_bsize - 1; 460 fs->e2fs_bmask = ~fs->e2fs_qbmask; 461 fs->e2fs_ncg = 462 howmany(fs->e2fs.e2fs_bcount - fs->e2fs.e2fs_first_dblock, 463 fs->e2fs.e2fs_bpg); 464 fs->e2fs_fsbtodb = fs->e2fs.e2fs_log_bsize + 1; 465 fs->e2fs_ngdb = howmany(fs->e2fs_ncg, 466 fs->e2fs_bsize / sizeof(struct ext2_gd)); 467 468 return (1); 469} 470 471static struct disklabel * 472getdisklabel(char *s, int fd) 473{ 474 static struct disklabel lab; 475 476 if (ioctl(fd, DIOCGDINFO, (char *)&lab) < 0) { 477 if (s == NULL) 478 return ((struct disklabel *)NULL); 479 pwarn("ioctl (GCINFO): %s\n", strerror(errno)); 480 errexit("%s: can't read disk label\n", s); 481 } 482 return (&lab); 483} 484 485daddr32_t 486cgoverhead(int c) 487{ 488 int overh; 489 overh = 1 /* block bitmap */ + 490 1 /* inode bitmap */ + 491 sblock.e2fs_itpg; 492 if (sblock.e2fs.e2fs_rev > E2FS_REV0 && 493 sblock.e2fs.e2fs_features_rocompat & EXT2F_ROCOMPAT_SPARSESUPER) { 494 if (cg_has_sb(c) == 0) 495 return overh; 496 } 497 overh += 1 + sblock.e2fs_ngdb; 498 return overh; 499} 500