setup.c revision 322806
11558Srgrimes/* 21558Srgrimes * Copyright (c) 1980, 1986, 1993 31558Srgrimes * The Regents of the University of California. All rights reserved. 41558Srgrimes * 51558Srgrimes * Redistribution and use in source and binary forms, with or without 61558Srgrimes * modification, are permitted provided that the following conditions 71558Srgrimes * are met: 81558Srgrimes * 1. Redistributions of source code must retain the above copyright 91558Srgrimes * notice, this list of conditions and the following disclaimer. 101558Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 111558Srgrimes * notice, this list of conditions and the following disclaimer in the 121558Srgrimes * documentation and/or other materials provided with the distribution. 131558Srgrimes * 4. Neither the name of the University nor the names of its contributors 141558Srgrimes * may be used to endorse or promote products derived from this software 151558Srgrimes * without specific prior written permission. 161558Srgrimes * 171558Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 181558Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 191558Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 201558Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 211558Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 221558Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 231558Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 241558Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 251558Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 261558Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 271558Srgrimes * SUCH DAMAGE. 281558Srgrimes */ 291558Srgrimes 30114589Sobrien#if 0 311558Srgrimes#ifndef lint 3223675Speterstatic const char sccsid[] = "@(#)setup.c 8.10 (Berkeley) 5/9/95"; 33114589Sobrien#endif /* not lint */ 3441477Sjulian#endif 35114589Sobrien#include <sys/cdefs.h> 36114589Sobrien__FBSDID("$FreeBSD: stable/11/sbin/fsck_ffs/setup.c 322806 2017-08-23 04:35:03Z mckusick $"); 371558Srgrimes 381558Srgrimes#include <sys/param.h> 391558Srgrimes#include <sys/stat.h> 40101994Sbmilekic#define FSTYPENAMES 411558Srgrimes#include <sys/disklabel.h> 421558Srgrimes#include <sys/file.h> 4386514Siedowse#include <sys/sysctl.h> 4423675Speter 4523675Speter#include <ufs/ufs/dinode.h> 4623675Speter#include <ufs/ffs/fs.h> 4723675Speter 4823675Speter#include <ctype.h> 4923675Speter#include <err.h> 501558Srgrimes#include <errno.h> 51103949Smike#include <limits.h> 52101037Smux#include <stdint.h> 531558Srgrimes#include <string.h> 5423675Speter 551558Srgrimes#include "fsck.h" 561558Srgrimes 571558Srgrimesstruct bufarea asblk; 581558Srgrimes#define altsblock (*asblk.b_un.b_fs) 591558Srgrimes#define POWEROF2(num) (((num) & ((num) - 1)) == 0) 601558Srgrimes 61322806Smckusickstatic int calcsb(char *dev, int devfd, struct fs *fs); 62322806Smckusickstatic void saverecovery(int readfd, int writefd); 63322806Smckusickstatic int chkrecovery(int devfd); 641558Srgrimes 6523675Speter/* 6623675Speter * Read in a superblock finding an alternate if necessary. 67102231Strhodes * Return 1 if successful, 0 if unsuccessful, -1 if file system 68187931Sobrien * is already clean (ckclean and preen mode only). 6923675Speter */ 707585Sbdeint 7192839Simpsetup(char *dev) 721558Srgrimes{ 7386514Siedowse long cg, asked, i, j; 7475557Smckusick long bmapsize; 751558Srgrimes struct stat statb; 761558Srgrimes struct fs proto; 7786514Siedowse size_t size; 781558Srgrimes 791558Srgrimes havesb = 0; 801558Srgrimes fswritefd = -1; 8162668Smckusick cursnapshot = 0; 821558Srgrimes if (stat(dev, &statb) < 0) { 831558Srgrimes printf("Can't stat %s: %s\n", dev, strerror(errno)); 8474556Smckusick if (bkgrdflag) { 8574556Smckusick unlink(snapname); 8674556Smckusick bkgrdflag = 0; 8774556Smckusick } 881558Srgrimes return (0); 891558Srgrimes } 9053781Sphk if ((statb.st_mode & S_IFMT) != S_IFCHR && 9153781Sphk (statb.st_mode & S_IFMT) != S_IFBLK) { 9274556Smckusick if (bkgrdflag != 0 && (statb.st_flags & SF_SNAPSHOT) == 0) { 9374556Smckusick unlink(snapname); 9474556Smckusick printf("background fsck lacks a snapshot\n"); 9574556Smckusick exit(EEXIT); 9674556Smckusick } 9774556Smckusick if ((statb.st_flags & SF_SNAPSHOT) != 0 && cvtlevel == 0) { 9862668Smckusick cursnapshot = statb.st_ino; 9962668Smckusick } else { 10074556Smckusick if (cvtlevel == 0 || 10174556Smckusick (statb.st_flags & SF_SNAPSHOT) == 0) { 10274556Smckusick if (preen && bkgrdflag) { 10374556Smckusick unlink(snapname); 10474556Smckusick bkgrdflag = 0; 10574556Smckusick } 10674556Smckusick pfatal("%s is not a disk device", dev); 10774556Smckusick if (reply("CONTINUE") == 0) { 10874556Smckusick if (bkgrdflag) { 10974556Smckusick unlink(snapname); 11074556Smckusick bkgrdflag = 0; 11174556Smckusick } 11274556Smckusick return (0); 11374556Smckusick } 11474556Smckusick } else { 11574556Smckusick if (bkgrdflag) { 11674556Smckusick unlink(snapname); 11774556Smckusick bkgrdflag = 0; 11874556Smckusick } 11974556Smckusick pfatal("cannot convert a snapshot"); 12074556Smckusick exit(EEXIT); 12174556Smckusick } 12262668Smckusick } 1231558Srgrimes } 1241558Srgrimes if ((fsreadfd = open(dev, O_RDONLY)) < 0) { 12574556Smckusick if (bkgrdflag) { 12674556Smckusick unlink(snapname); 12774556Smckusick bkgrdflag = 0; 12874556Smckusick } 1291558Srgrimes printf("Can't open %s: %s\n", dev, strerror(errno)); 1301558Srgrimes return (0); 1311558Srgrimes } 13274556Smckusick if (bkgrdflag) { 13374556Smckusick unlink(snapname); 13474556Smckusick size = MIBSIZE; 13574556Smckusick if (sysctlnametomib("vfs.ffs.adjrefcnt", adjrefcnt, &size) < 0|| 13674556Smckusick sysctlnametomib("vfs.ffs.adjblkcnt", adjblkcnt, &size) < 0|| 13774556Smckusick sysctlnametomib("vfs.ffs.freefiles", freefiles, &size) < 0|| 13874556Smckusick sysctlnametomib("vfs.ffs.freedirs", freedirs, &size) < 0 || 13974556Smckusick sysctlnametomib("vfs.ffs.freeblks", freeblks, &size) < 0) { 14074556Smckusick pfatal("kernel lacks background fsck support\n"); 14174556Smckusick exit(EEXIT); 14274556Smckusick } 143143235Sdelphij /* 144143235Sdelphij * When kernel is lack of runtime bgfsck superblock summary 145143235Sdelphij * adjustment functionality, it does not mean we can not 146143235Sdelphij * continue, as old kernels will recompute the summary at 147143235Sdelphij * mount time. However, it will be an unexpected softupdates 148143235Sdelphij * inconsistency if it turns out that the summary is still 149143235Sdelphij * incorrect. Set a flag so subsequent operation can know 150143235Sdelphij * this. 151143235Sdelphij */ 152143235Sdelphij bkgrdsumadj = 1; 153143235Sdelphij if (sysctlnametomib("vfs.ffs.adjndir", adjndir, &size) < 0 || 154143235Sdelphij sysctlnametomib("vfs.ffs.adjnbfree", adjnbfree, &size) < 0 || 155143235Sdelphij sysctlnametomib("vfs.ffs.adjnifree", adjnifree, &size) < 0 || 156143235Sdelphij sysctlnametomib("vfs.ffs.adjnffree", adjnffree, &size) < 0 || 157143235Sdelphij sysctlnametomib("vfs.ffs.adjnumclusters", adjnumclusters, &size) < 0) { 158143235Sdelphij bkgrdsumadj = 0; 159143235Sdelphij pwarn("kernel lacks runtime superblock summary adjustment support"); 160143235Sdelphij } 16174556Smckusick cmd.version = FFS_CMD_VERSION; 16274556Smckusick cmd.handle = fsreadfd; 16374556Smckusick fswritefd = -1; 16474556Smckusick } 1651558Srgrimes if (preen == 0) 1661558Srgrimes printf("** %s", dev); 16774556Smckusick if (bkgrdflag == 0 && 16874556Smckusick (nflag || (fswritefd = open(dev, O_WRONLY)) < 0)) { 1691558Srgrimes fswritefd = -1; 1701558Srgrimes if (preen) 1711558Srgrimes pfatal("NO WRITE ACCESS"); 1721558Srgrimes printf(" (NO WRITE)"); 1731558Srgrimes } 1741558Srgrimes if (preen == 0) 1751558Srgrimes printf("\n"); 1761558Srgrimes /* 1771558Srgrimes * Read in the superblock, looking for alternates if necessary 1781558Srgrimes */ 1791558Srgrimes if (readsb(1) == 0) { 18023675Speter skipclean = 0; 181322806Smckusick if (bflag || preen || calcsb(dev, fsreadfd, &proto) == 0) 1821558Srgrimes return(0); 1831558Srgrimes if (reply("LOOK FOR ALTERNATE SUPERBLOCKS") == 0) 1841558Srgrimes return (0); 1851558Srgrimes for (cg = 0; cg < proto.fs_ncg; cg++) { 1861558Srgrimes bflag = fsbtodb(&proto, cgsblock(&proto, cg)); 1871558Srgrimes if (readsb(0) != 0) 1881558Srgrimes break; 1891558Srgrimes } 1901558Srgrimes if (cg >= proto.fs_ncg) { 1911558Srgrimes printf("%s %s\n%s %s\n%s %s\n", 1921558Srgrimes "SEARCH FOR ALTERNATE SUPER-BLOCK", 1931558Srgrimes "FAILED. YOU MUST USE THE", 1941558Srgrimes "-b OPTION TO FSCK TO SPECIFY THE", 1951558Srgrimes "LOCATION OF AN ALTERNATE", 1961558Srgrimes "SUPER-BLOCK TO SUPPLY NEEDED", 197231377Strasz "INFORMATION; SEE fsck_ffs(8)."); 1986280Sbde bflag = 0; 1991558Srgrimes return(0); 2001558Srgrimes } 201307535Smckusick pwarn("USING ALTERNATE SUPERBLOCK AT %jd\n", bflag); 2026280Sbde bflag = 0; 2031558Srgrimes } 204187931Sobrien if (skipclean && ckclean && sblock.fs_clean) { 205118302Sru pwarn("FILE SYSTEM CLEAN; SKIPPING CHECKS\n"); 20641474Sjulian return (-1); 20741474Sjulian } 2081558Srgrimes maxfsblock = sblock.fs_size; 2091558Srgrimes maxino = sblock.fs_ncg * sblock.fs_ipg; 2101558Srgrimes /* 2111558Srgrimes * Check and potentially fix certain fields in the super block. 2121558Srgrimes */ 2131558Srgrimes if (sblock.fs_optim != FS_OPTTIME && sblock.fs_optim != FS_OPTSPACE) { 2141558Srgrimes pfatal("UNDEFINED OPTIMIZATION IN SUPERBLOCK"); 2151558Srgrimes if (reply("SET TO DEFAULT") == 1) { 2161558Srgrimes sblock.fs_optim = FS_OPTTIME; 2171558Srgrimes sbdirty(); 2181558Srgrimes } 2191558Srgrimes } 2201558Srgrimes if ((sblock.fs_minfree < 0 || sblock.fs_minfree > 99)) { 2211558Srgrimes pfatal("IMPOSSIBLE MINFREE=%d IN SUPERBLOCK", 2221558Srgrimes sblock.fs_minfree); 2231558Srgrimes if (reply("SET TO DEFAULT") == 1) { 2241558Srgrimes sblock.fs_minfree = 10; 2251558Srgrimes sbdirty(); 2261558Srgrimes } 2271558Srgrimes } 22898542Smckusick if (sblock.fs_magic == FS_UFS1_MAGIC && 22998542Smckusick sblock.fs_old_inodefmt < FS_44INODEFMT) { 230102231Strhodes pwarn("Format of file system is too old.\n"); 23196483Sphk pwarn("Must update to modern format using a version of fsck\n"); 23296483Sphk pfatal("from before 2002 with the command ``fsck -c 2''\n"); 23396483Sphk exit(EEXIT); 2341558Srgrimes } 23523675Speter if (asblk.b_dirty && !bflag) { 23623675Speter memmove(&altsblock, &sblock, (size_t)sblock.fs_sbsize); 2371558Srgrimes flush(fswritefd, &asblk); 2381558Srgrimes } 239322806Smckusick if (preen == 0 && yflag == 0 && sblock.fs_magic == FS_UFS2_MAGIC && 240322806Smckusick fswritefd != -1 && chkrecovery(fsreadfd) == 0 && 241322806Smckusick reply("SAVE DATA TO FIND ALTERNATE SUPERBLOCKS") != 0) 242322806Smckusick saverecovery(fsreadfd, fswritefd); 2431558Srgrimes /* 2441558Srgrimes * read in the summary info. 2451558Srgrimes */ 2461558Srgrimes asked = 0; 247248658Smckusick sblock.fs_csp = Calloc(1, sblock.fs_cssize); 248125036Scperciva if (sblock.fs_csp == NULL) { 249125036Scperciva printf("cannot alloc %u bytes for cg summary info\n", 250125036Scperciva (unsigned)sblock.fs_cssize); 251125036Scperciva goto badsb; 252125036Scperciva } 2531558Srgrimes for (i = 0, j = 0; i < sblock.fs_cssize; i += sblock.fs_bsize, j++) { 254298907Saraujo size = MIN(sblock.fs_cssize - i, sblock.fs_bsize); 255247212Smckusick readcnt[sblk.b_type]++; 256163845Spjd if (blread(fsreadfd, (char *)sblock.fs_csp + i, 2571558Srgrimes fsbtodb(&sblock, sblock.fs_csaddr + j * sblock.fs_frag), 2581558Srgrimes size) != 0 && !asked) { 2591558Srgrimes pfatal("BAD SUMMARY INFORMATION"); 26034266Sjulian if (reply("CONTINUE") == 0) { 26134266Sjulian ckfini(0); 26223675Speter exit(EEXIT); 26334266Sjulian } 2641558Srgrimes asked++; 2651558Srgrimes } 2661558Srgrimes } 2671558Srgrimes /* 2681558Srgrimes * allocate and initialize the necessary maps 2691558Srgrimes */ 270103949Smike bmapsize = roundup(howmany(maxfsblock, CHAR_BIT), sizeof(short)); 271248658Smckusick blockmap = Calloc((unsigned)bmapsize, sizeof (char)); 2721558Srgrimes if (blockmap == NULL) { 2731558Srgrimes printf("cannot alloc %u bytes for blockmap\n", 2741558Srgrimes (unsigned)bmapsize); 2751558Srgrimes goto badsb; 2761558Srgrimes } 277317860Spfg inostathead = Calloc(sblock.fs_ncg, sizeof(struct inostatlist)); 27841474Sjulian if (inostathead == NULL) { 27941474Sjulian printf("cannot alloc %u bytes for inostathead\n", 28041474Sjulian (unsigned)(sizeof(struct inostatlist) * (sblock.fs_ncg))); 2811558Srgrimes goto badsb; 2821558Srgrimes } 283107518Smckusick numdirs = MAX(sblock.fs_cstotal.cs_ndir, 128); 28457573Smckusick dirhash = numdirs; 2851558Srgrimes inplast = 0; 2861558Srgrimes listmax = numdirs + 10; 287317860Spfg inpsort = (struct inoinfo **)Calloc(listmax, sizeof(struct inoinfo *)); 288317860Spfg inphead = (struct inoinfo **)Calloc(numdirs, sizeof(struct inoinfo *)); 2891558Srgrimes if (inpsort == NULL || inphead == NULL) { 290101037Smux printf("cannot alloc %ju bytes for inphead\n", 291101037Smux (uintmax_t)numdirs * sizeof(struct inoinfo *)); 2921558Srgrimes goto badsb; 2931558Srgrimes } 2941558Srgrimes bufinit(); 29534266Sjulian if (sblock.fs_flags & FS_DOSOFTDEP) 29634266Sjulian usedsoftdep = 1; 29734266Sjulian else 29834266Sjulian usedsoftdep = 0; 2991558Srgrimes return (1); 3001558Srgrimes 3011558Srgrimesbadsb: 30223675Speter ckfini(0); 3031558Srgrimes return (0); 3041558Srgrimes} 3051558Srgrimes 3061558Srgrimes/* 30798542Smckusick * Possible superblock locations ordered from most to least likely. 30898542Smckusick */ 30998542Smckusickstatic int sblock_try[] = SBLOCKSEARCH; 31098542Smckusick 311122784Swes#define BAD_MAGIC_MSG \ 312122784Swes"The previous newfs operation on this volume did not complete.\n" \ 313122784Swes"You must complete newfs before mounting this volume.\n" 314122784Swes 31598542Smckusick/* 3161558Srgrimes * Read in the super block and its summary info. 3171558Srgrimes */ 31875557Smckusickint 31992839Simpreadsb(int listerr) 3201558Srgrimes{ 32198542Smckusick ufs2_daddr_t super; 322322806Smckusick int i, bad; 3231558Srgrimes 32498542Smckusick if (bflag) { 32598542Smckusick super = bflag; 326247212Smckusick readcnt[sblk.b_type]++; 327163845Spjd if ((blread(fsreadfd, (char *)&sblock, super, (long)SBLOCKSIZE))) 32898542Smckusick return (0); 329134011Sjhb if (sblock.fs_magic == FS_BAD_MAGIC) { 330122784Swes fprintf(stderr, BAD_MAGIC_MSG); 331122784Swes exit(11); 332122784Swes } 333107518Smckusick if (sblock.fs_magic != FS_UFS1_MAGIC && 334107518Smckusick sblock.fs_magic != FS_UFS2_MAGIC) { 335307535Smckusick fprintf(stderr, "%jd is not a file system superblock\n", 336107518Smckusick bflag); 337107518Smckusick return (0); 338107518Smckusick } 33998542Smckusick } else { 34098542Smckusick for (i = 0; sblock_try[i] != -1; i++) { 34198542Smckusick super = sblock_try[i] / dev_bsize; 342247212Smckusick readcnt[sblk.b_type]++; 343163845Spjd if ((blread(fsreadfd, (char *)&sblock, super, 34498542Smckusick (long)SBLOCKSIZE))) 34598542Smckusick return (0); 346134011Sjhb if (sblock.fs_magic == FS_BAD_MAGIC) { 347122784Swes fprintf(stderr, BAD_MAGIC_MSG); 348122784Swes exit(11); 349122784Swes } 35098542Smckusick if ((sblock.fs_magic == FS_UFS1_MAGIC || 35198542Smckusick (sblock.fs_magic == FS_UFS2_MAGIC && 352107294Smckusick sblock.fs_sblockloc == sblock_try[i])) && 35398542Smckusick sblock.fs_ncg >= 1 && 354104745Smckusick sblock.fs_bsize >= MINBSIZE && 355176573Sdelphij sblock.fs_sbsize >= roundup(sizeof(struct fs), dev_bsize)) 35698542Smckusick break; 35798542Smckusick } 35898542Smckusick if (sblock_try[i] == -1) { 359102231Strhodes fprintf(stderr, "Cannot find file system superblock\n"); 36098542Smckusick return (0); 36198542Smckusick } 36298542Smckusick } 3631558Srgrimes /* 364102231Strhodes * Compute block size that the file system is based on, 3651558Srgrimes * according to fsbtodb, and adjust superblock block number 3661558Srgrimes * so we can tell if this is an alternate later. 3671558Srgrimes */ 3681558Srgrimes super *= dev_bsize; 3691558Srgrimes dev_bsize = sblock.fs_fsize / fsbtodb(&sblock, 1); 3701558Srgrimes sblk.b_bno = super / dev_bsize; 37198542Smckusick sblk.b_size = SBLOCKSIZE; 3721558Srgrimes /* 37394031Smckusick * Compare all fields that should not differ in alternate super block. 3741558Srgrimes * When an alternate super-block is specified this check is skipped. 3751558Srgrimes */ 376322806Smckusick if (bflag) 377322806Smckusick goto out; 3781558Srgrimes getblk(&asblk, cgsblock(&sblock, sblock.fs_ncg - 1), sblock.fs_sbsize); 3791558Srgrimes if (asblk.b_errs) 3801558Srgrimes return (0); 381322806Smckusick bad = 0; 382322806Smckusick#define CHK(x, y) \ 383322806Smckusick if (altsblock.x != sblock.x) { \ 384322806Smckusick bad++; \ 385322806Smckusick if (listerr && debug) \ 386322806Smckusick printf("SUPER BLOCK VS ALTERNATE MISMATCH %s: " y " vs " y "\n", \ 387322806Smckusick #x, (intmax_t)sblock.x, (intmax_t)altsblock.x); \ 3881558Srgrimes } 389322806Smckusick CHK(fs_sblkno, "%jd"); 390322806Smckusick CHK(fs_cblkno, "%jd"); 391322806Smckusick CHK(fs_iblkno, "%jd"); 392322806Smckusick CHK(fs_dblkno, "%jd"); 393322806Smckusick CHK(fs_ncg, "%jd"); 394322806Smckusick CHK(fs_bsize, "%jd"); 395322806Smckusick CHK(fs_fsize, "%jd"); 396322806Smckusick CHK(fs_frag, "%jd"); 397322806Smckusick CHK(fs_bmask, "%#jx"); 398322806Smckusick CHK(fs_fmask, "%#jx"); 399322806Smckusick CHK(fs_bshift, "%jd"); 400322806Smckusick CHK(fs_fshift, "%jd"); 401322806Smckusick CHK(fs_fragshift, "%jd"); 402322806Smckusick CHK(fs_fsbtodb, "%jd"); 403322806Smckusick CHK(fs_sbsize, "%jd"); 404322806Smckusick CHK(fs_nindir, "%jd"); 405322806Smckusick CHK(fs_inopb, "%jd"); 406322806Smckusick CHK(fs_cssize, "%jd"); 407322806Smckusick CHK(fs_ipg, "%jd"); 408322806Smckusick CHK(fs_fpg, "%jd"); 409322806Smckusick CHK(fs_magic, "%#jx"); 410322806Smckusick#undef CHK 411322806Smckusick if (bad) { 412322806Smckusick if (listerr == 0) 413322806Smckusick return (0); 414322806Smckusick if (preen) 415322806Smckusick printf("%s: ", cdevname); 416322806Smckusick printf( 417322806Smckusick "VALUES IN SUPER BLOCK LSB=%jd DISAGREE WITH THOSE IN\n" 418322806Smckusick "LAST ALTERNATE LSB=%jd\n", 419322806Smckusick sblk.b_bno, asblk.b_bno); 420322806Smckusick if (reply("IGNORE ALTERNATE SUPER BLOCK") == 0) 421322806Smckusick return (0); 422322806Smckusick } 423107518Smckusickout: 42498542Smckusick /* 42598542Smckusick * If not yet done, update UFS1 superblock with new wider fields. 42698542Smckusick */ 42798542Smckusick if (sblock.fs_magic == FS_UFS1_MAGIC && 42898542Smckusick sblock.fs_maxbsize != sblock.fs_bsize) { 42998542Smckusick sblock.fs_maxbsize = sblock.fs_bsize; 43098542Smckusick sblock.fs_time = sblock.fs_old_time; 43198542Smckusick sblock.fs_size = sblock.fs_old_size; 43298542Smckusick sblock.fs_dsize = sblock.fs_old_dsize; 43398542Smckusick sblock.fs_csaddr = sblock.fs_old_csaddr; 43498542Smckusick sblock.fs_cstotal.cs_ndir = sblock.fs_old_cstotal.cs_ndir; 43598542Smckusick sblock.fs_cstotal.cs_nbfree = sblock.fs_old_cstotal.cs_nbfree; 43698542Smckusick sblock.fs_cstotal.cs_nifree = sblock.fs_old_cstotal.cs_nifree; 43798542Smckusick sblock.fs_cstotal.cs_nffree = sblock.fs_old_cstotal.cs_nffree; 43898542Smckusick } 4391558Srgrimes havesb = 1; 4401558Srgrimes return (1); 4411558Srgrimes} 4421558Srgrimes 44375884Siedowsevoid 44492839Simpsblock_init(void) 44575557Smckusick{ 44675557Smckusick 44775557Smckusick fswritefd = -1; 44875557Smckusick fsmodified = 0; 44975557Smckusick lfdir = 0; 450247212Smckusick initbarea(&sblk, BT_SUPERBLK); 451247212Smckusick initbarea(&asblk, BT_SUPERBLK); 452248658Smckusick sblk.b_un.b_buf = Malloc(SBLOCKSIZE); 453248658Smckusick asblk.b_un.b_buf = Malloc(SBLOCKSIZE); 45475557Smckusick if (sblk.b_un.b_buf == NULL || asblk.b_un.b_buf == NULL) 45575557Smckusick errx(EEXIT, "cannot allocate space for superblock"); 456276737Simp dev_bsize = secsize = DEV_BSIZE; 45775557Smckusick} 458322806Smckusick 459322806Smckusick/* 460322806Smckusick * Calculate a prototype superblock based on information in the boot area. 461322806Smckusick * When done the cgsblock macro can be calculated and the fs_ncg field 462322806Smckusick * can be used. Do NOT attempt to use other macros without verifying that 463322806Smckusick * their needed information is available! 464322806Smckusick */ 465322806Smckusickstatic int 466322806Smckusickcalcsb(char *dev, int devfd, struct fs *fs) 467322806Smckusick{ 468322806Smckusick struct fsrecovery fsr; 469322806Smckusick 470322806Smckusick /* 471322806Smckusick * We need fragments-per-group and the partition-size. 472322806Smckusick * 473322806Smckusick * Newfs stores these details at the end of the boot block area 474322806Smckusick * at the start of the filesystem partition. If they have been 475322806Smckusick * overwritten by a boot block, we fail. But usually they are 476322806Smckusick * there and we can use them. 477322806Smckusick */ 478322806Smckusick if (blread(devfd, (char *)&fsr, 479322806Smckusick (SBLOCK_UFS2 - sizeof(fsr)) / dev_bsize, sizeof(fsr)) || 480322806Smckusick fsr.fsr_magic != FS_UFS2_MAGIC) 481322806Smckusick return (0); 482322806Smckusick memset(fs, 0, sizeof(struct fs)); 483322806Smckusick fs->fs_fpg = fsr.fsr_fpg; 484322806Smckusick fs->fs_fsbtodb = fsr.fsr_fsbtodb; 485322806Smckusick fs->fs_sblkno = fsr.fsr_sblkno; 486322806Smckusick fs->fs_magic = fsr.fsr_magic; 487322806Smckusick fs->fs_ncg = fsr.fsr_ncg; 488322806Smckusick return (1); 489322806Smckusick} 490322806Smckusick 491322806Smckusick/* 492322806Smckusick * Check to see if recovery information exists. 493322806Smckusick */ 494322806Smckusickstatic int 495322806Smckusickchkrecovery(int devfd) 496322806Smckusick{ 497322806Smckusick struct fsrecovery fsr; 498322806Smckusick 499322806Smckusick if (blread(devfd, (char *)&fsr, 500322806Smckusick (SBLOCK_UFS2 - sizeof(fsr)) / dev_bsize, sizeof(fsr)) || 501322806Smckusick fsr.fsr_magic != FS_UFS2_MAGIC) 502322806Smckusick return (0); 503322806Smckusick return (1); 504322806Smckusick} 505322806Smckusick 506322806Smckusick/* 507322806Smckusick * Read the last sector of the boot block, replace the last 508322806Smckusick * 20 bytes with the recovery information, then write it back. 509322806Smckusick * The recovery information only works for UFS2 filesystems. 510322806Smckusick */ 511322806Smckusickstatic void 512322806Smckusicksaverecovery(int readfd, int writefd) 513322806Smckusick{ 514322806Smckusick struct fsrecovery fsr; 515322806Smckusick 516322806Smckusick if (sblock.fs_magic != FS_UFS2_MAGIC || 517322806Smckusick blread(readfd, (char *)&fsr, 518322806Smckusick (SBLOCK_UFS2 - sizeof(fsr)) / dev_bsize, sizeof(fsr))) 519322806Smckusick return; 520322806Smckusick fsr.fsr_magic = sblock.fs_magic; 521322806Smckusick fsr.fsr_fpg = sblock.fs_fpg; 522322806Smckusick fsr.fsr_fsbtodb = sblock.fs_fsbtodb; 523322806Smckusick fsr.fsr_sblkno = sblock.fs_sblkno; 524322806Smckusick fsr.fsr_ncg = sblock.fs_ncg; 525322806Smckusick blwrite(writefd, (char *)&fsr, (SBLOCK_UFS2 - sizeof(fsr)) / dev_bsize, 526322806Smckusick sizeof(fsr)); 527322806Smckusick} 528