/* $NetBSD: setup.c,v 1.78 2005/06/27 01:25:35 christos Exp $ */ /* * Copyright (c) 1980, 1986, 1993 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include #ifndef lint #if 0 static char sccsid[] = "@(#)setup.c 8.10 (Berkeley) 5/9/95"; #else __RCSID("$NetBSD: setup.c,v 1.78 2005/06/27 01:25:35 christos Exp $"); #endif #endif /* not lint */ #include #include #include #include #define FSTYPENAMES #include #include #include #include #include #include #include #include #include #include #include #include #include #include "fsck.h" #include "extern.h" #include "fsutil.h" #define POWEROF2(num) (((num) & ((num) - 1)) == 0) static void badsb(int, const char *); static int calcsb(const char *, int, struct fs *); static struct disklabel *getdisklabel(const char *, int); static struct partition *getdisklabelpart(const char *, struct disklabel *); static int readsb(int); static int readappleufs(void); int16_t sblkpostbl[256]; /* * Read in a superblock finding an alternate if necessary. * Return 1 if successful, 0 if unsuccessful, -1 if filesystem * is already clean (preen mode only). */ int setup(const char *dev) { long cg, size, asked, i, j; long bmapsize; struct disklabel *lp = NULL; off_t sizepb; struct stat statb; struct fs proto; int doskipclean; u_int64_t maxfilesize; struct csum *ccsp; havesb = 0; fswritefd = -1; doskipclean = skipclean; if (stat(dev, &statb) < 0) { printf("Can't stat %s: %s\n", dev, strerror(errno)); return (0); } if (!forceimage && !S_ISCHR(statb.st_mode)) { pfatal("%s is not a character device", dev); if (reply("CONTINUE") == 0) return (0); } if ((fsreadfd = open(dev, O_RDONLY)) < 0) { printf("Can't open %s: %s\n", dev, strerror(errno)); return (0); } if (nflag || (fswritefd = open(dev, O_WRONLY)) < 0) { fswritefd = -1; if (preen) pfatal("NO WRITE ACCESS"); printf("** %s (NO WRITE)\n", dev); quiet = 0; } else if (!preen && !quiet) printf("** %s\n", dev); fsmodified = 0; lfdir = 0; initbarea(&sblk); initbarea(&asblk); sblk.b_un.b_buf = malloc(SBLOCKSIZE); sblock = malloc(SBLOCKSIZE); asblk.b_un.b_buf = malloc(SBLOCKSIZE); altsblock = malloc(SBLOCKSIZE); if (sblk.b_un.b_buf == NULL || asblk.b_un.b_buf == NULL || sblock == NULL || altsblock == NULL) errx(EEXIT, "cannot allocate space for superblock"); if (!forceimage && (lp = getdisklabel(NULL, fsreadfd)) != NULL) dev_bsize = secsize = lp->d_secsize; else dev_bsize = secsize = DEV_BSIZE; /* * Read in the superblock, looking for alternates if necessary */ if (readsb(1) == 0) { if (bflag || preen || forceimage || calcsb(dev, fsreadfd, &proto) == 0) return(0); if (reply("LOOK FOR ALTERNATE SUPERBLOCKS") == 0) return (0); for (cg = 0; cg < proto.fs_ncg; cg++) { bflag = fsbtodb(&proto, cgsblock(&proto, cg)); if (readsb(0) != 0) break; } if (cg >= proto.fs_ncg) { printf("%s %s\n%s %s\n%s %s\n", "SEARCH FOR ALTERNATE SUPER-BLOCK", "FAILED. YOU MUST USE THE", "-b OPTION TO fsck_ffs TO SPECIFY THE", "LOCATION OF AN ALTERNATE", "SUPER-BLOCK TO SUPPLY NEEDED", "INFORMATION; SEE fsck_ffs(8)."); return(0); } doskipclean = 0; pwarn("USING ALTERNATE SUPERBLOCK AT %d\n", bflag); } if (debug) printf("clean = %d\n", sblock->fs_clean); if (doswap) doskipclean = 0; if (sblock->fs_clean & FS_ISCLEAN) { if (doskipclean) { if (!quiet) pwarn("%sile system is clean; not checking\n", preen ? "f" : "** F"); return (-1); } if (!preen && !doswap) pwarn("** File system is already clean\n"); } maxfsblock = sblock->fs_size; maxino = sblock->fs_ncg * sblock->fs_ipg; sizepb = sblock->fs_bsize; maxfilesize = sblock->fs_bsize * NDADDR - 1; for (i = 0; i < NIADDR; i++) { sizepb *= NINDIR(sblock); maxfilesize += sizepb; } if ((!is_ufs2 && cvtlevel >= 4) && (sblock->fs_old_flags & FS_FLAGS_UPDATED) == 0) { if (preen) pwarn("CONVERTING TO NEW SUPERBLOCK LAYOUT\n"); else if (!reply("CONVERT TO NEW SUPERBLOCK LAYOUT")) return(0); sblock->fs_old_flags |= FS_FLAGS_UPDATED; /* Disable the postbl tables */ sblock->fs_old_cpc = 0; sblock->fs_old_nrpos = 1; sblock->fs_old_trackskew = 0; /* The other fields have already been updated by * sb_oldfscompat_read */ sbdirty(); } if (!is_ufs2 && cvtlevel == 3 && (sblock->fs_old_flags & FS_FLAGS_UPDATED)) { if (preen) pwarn("DOWNGRADING TO OLD SUPERBLOCK LAYOUT\n"); else if (!reply("DOWNGRADE TO OLD SUPERBLOCK LAYOUT")) return(0); sblock->fs_old_flags &= ~FS_FLAGS_UPDATED; sb_oldfscompat_write(sblock, sblock); sblock->fs_old_flags &= ~FS_FLAGS_UPDATED; /* just in case */ /* Leave postbl tables disabled, but blank its superblock region anyway */ sblock->fs_old_postblformat = FS_DYNAMICPOSTBLFMT; sblock->fs_old_cpc = 0; sblock->fs_old_nrpos = 1; sblock->fs_old_trackskew = 0; memset(&sblock->fs_old_postbl_start, 0xff, 256); sb_oldfscompat_read(sblock, &sblocksave); sbdirty(); } /* * Check and potentially fix certain fields in the super block. */ if (sblock->fs_optim != FS_OPTTIME && sblock->fs_optim != FS_OPTSPACE) { pfatal("UNDEFINED OPTIMIZATION IN SUPERBLOCK"); if (reply("SET TO DEFAULT") == 1) { sblock->fs_optim = FS_OPTTIME; sbdirty(); } } if ((sblock->fs_minfree < 0 || sblock->fs_minfree > 99)) { pfatal("IMPOSSIBLE MINFREE=%d IN SUPERBLOCK", sblock->fs_minfree); if (reply("SET TO DEFAULT") == 1) { sblock->fs_minfree = 10; sbdirty(); } } if (!is_ufs2 && sblock->fs_old_postblformat != FS_42POSTBLFMT && (sblock->fs_old_interleave < 1 || sblock->fs_old_interleave > sblock->fs_old_nsect)) { pwarn("IMPOSSIBLE INTERLEAVE=%d IN SUPERBLOCK", sblock->fs_old_interleave); sblock->fs_old_interleave = 1; if (preen) printf(" (FIXED)\n"); if (preen || reply("SET TO DEFAULT") == 1) { sbdirty(); dirty(&asblk); } } if (!is_ufs2 && sblock->fs_old_postblformat != FS_42POSTBLFMT && (sblock->fs_old_npsect < sblock->fs_old_nsect || sblock->fs_old_npsect > sblock->fs_old_nsect*2)) { pwarn("IMPOSSIBLE NPSECT=%d IN SUPERBLOCK", sblock->fs_old_npsect); sblock->fs_old_npsect = sblock->fs_old_nsect; if (preen) printf(" (FIXED)\n"); if (preen || reply("SET TO DEFAULT") == 1) { sbdirty(); dirty(&asblk); } } if (sblock->fs_bmask != ~(sblock->fs_bsize - 1)) { pwarn("INCORRECT BMASK=0x%x IN SUPERBLOCK", sblock->fs_bmask); sblock->fs_bmask = ~(sblock->fs_bsize - 1); if (preen) printf(" (FIXED)\n"); if (preen || reply("FIX") == 1) { sbdirty(); dirty(&asblk); } } if (sblock->fs_fmask != ~(sblock->fs_fsize - 1)) { pwarn("INCORRECT FMASK=0x%x IN SUPERBLOCK", sblock->fs_fmask); sblock->fs_fmask = ~(sblock->fs_fsize - 1); if (preen) printf(" (FIXED)\n"); if (preen || reply("FIX") == 1) { sbdirty(); dirty(&asblk); } } if (is_ufs2 || sblock->fs_old_inodefmt >= FS_44INODEFMT) { if (sblock->fs_maxfilesize != maxfilesize) { pwarn("INCORRECT MAXFILESIZE=%lld IN SUPERBLOCK", (unsigned long long)sblock->fs_maxfilesize); sblock->fs_maxfilesize = maxfilesize; if (preen) printf(" (FIXED)\n"); if (preen || reply("FIX") == 1) { sbdirty(); dirty(&asblk); } } if ((is_ufs2 && sblock->fs_maxsymlinklen != MAXSYMLINKLEN_UFS2) || (!is_ufs2 && sblock->fs_maxsymlinklen != MAXSYMLINKLEN_UFS1)) { pwarn("INCORRECT MAXSYMLINKLEN=%d IN SUPERBLOCK", sblock->fs_maxsymlinklen); sblock->fs_maxsymlinklen = is_ufs2 ? MAXSYMLINKLEN_UFS2 : MAXSYMLINKLEN_UFS1; if (preen) printf(" (FIXED)\n"); if (preen || reply("FIX") == 1) { sbdirty(); dirty(&asblk); } } if (sblock->fs_qbmask != ~sblock->fs_bmask) { pwarn("INCORRECT QBMASK=%#llx IN SUPERBLOCK", (unsigned long long)sblock->fs_qbmask); sblock->fs_qbmask = ~sblock->fs_bmask; if (preen) printf(" (FIXED)\n"); if (preen || reply("FIX") == 1) { sbdirty(); dirty(&asblk); } } if (sblock->fs_qfmask != ~sblock->fs_fmask) { pwarn("INCORRECT QFMASK=%#llx IN SUPERBLOCK", (unsigned long long)sblock->fs_qfmask); sblock->fs_qfmask = ~sblock->fs_fmask; if (preen) printf(" (FIXED)\n"); if (preen || reply("FIX") == 1) { sbdirty(); dirty(&asblk); } } newinofmt = 1; } else { sblock->fs_qbmask = ~sblock->fs_bmask; sblock->fs_qfmask = ~sblock->fs_fmask; newinofmt = 0; } /* * Convert to new inode format. */ if (!is_ufs2 && cvtlevel >= 2 && sblock->fs_old_inodefmt < FS_44INODEFMT) { if (preen) pwarn("CONVERTING TO NEW INODE FORMAT\n"); else if (!reply("CONVERT TO NEW INODE FORMAT")) return(0); doinglevel2++; sblock->fs_old_inodefmt = FS_44INODEFMT; sblock->fs_maxfilesize = maxfilesize; sblock->fs_maxsymlinklen = MAXSYMLINKLEN_UFS1; sblock->fs_qbmask = ~sblock->fs_bmask; sblock->fs_qfmask = ~sblock->fs_fmask; sbdirty(); dirty(&asblk); } /* * Convert to new cylinder group format. */ if (!is_ufs2 && cvtlevel >= 1 && sblock->fs_old_postblformat == FS_42POSTBLFMT) { if (preen) pwarn("CONVERTING TO NEW CYLINDER GROUP FORMAT\n"); else if (!reply("CONVERT TO NEW CYLINDER GROUP FORMAT")) return(0); doinglevel1++; sblock->fs_old_postblformat = FS_DYNAMICPOSTBLFMT; sblock->fs_old_nrpos = 8; sblock->fs_old_postbloff = (char *)(&sblock->fs_old_postbl_start) - (char *)(&sblock->fs_firstfield); sblock->fs_old_rotbloff = (char *)(&sblock->fs_magic+1) - (char *)(&sblock->fs_firstfield); sblock->fs_cgsize = fragroundup(sblock, CGSIZE(sblock)); sbdirty(); dirty(&asblk); } if (asblk.b_dirty && !bflag) { memmove(sblk.b_un.b_fs, sblock, SBLOCKSIZE); sb_oldfscompat_write(sblk.b_un.b_fs, sblocksave); if (needswap) ffs_sb_swap(sblk.b_un.b_fs, sblk.b_un.b_fs); memmove(asblk.b_un.b_fs, sblk.b_un.b_fs, (size_t)sblock->fs_sbsize); flush(fswritefd, &asblk); } /* * read in the summary info. */ asked = 0; sblock->fs_csp = (struct csum *)calloc(1, sblock->fs_cssize); for (i = 0, j = 0; i < sblock->fs_cssize; i += sblock->fs_bsize, j++) { size = sblock->fs_cssize - i < sblock->fs_bsize ? sblock->fs_cssize - i : sblock->fs_bsize; ccsp = (struct csum *)((char *)sblock->fs_csp + i); if (bread(fsreadfd, (char *)ccsp, fsbtodb(sblock, sblock->fs_csaddr + j * sblock->fs_frag), size) != 0 && !asked) { pfatal("BAD SUMMARY INFORMATION"); if (reply("CONTINUE") == 0) { markclean = 0; exit(EEXIT); } asked++; } if (doswap) { ffs_csum_swap(ccsp, ccsp, size); bwrite(fswritefd, (char *)ccsp, fsbtodb(sblock, sblock->fs_csaddr + j * sblock->fs_frag), size); } if (needswap) ffs_csum_swap(ccsp, ccsp, size); } /* * allocate and initialize the necessary maps */ bmapsize = roundup(howmany(maxfsblock, NBBY), sizeof(int16_t)); blockmap = calloc((unsigned)bmapsize, sizeof (char)); if (blockmap == NULL) { pwarn("cannot alloc %u bytes for blockmap\n", (unsigned)bmapsize); goto badsblabel; } inostathead = calloc((unsigned)(sblock->fs_ncg), sizeof(struct inostatlist)); if (inostathead == NULL) { pwarn("cannot alloc %u bytes for inostathead\n", (unsigned)(sizeof(struct inostatlist) * (sblock->fs_ncg))); goto badsblabel; } /* * cs_ndir may be inaccurate, particularly if we're using the -b * option, so set a minimum to prevent bogus subdirectory reconnects * and really inefficient directory scans. * Also set a maximum in case the value is too large. */ numdirs = sblock->fs_cstotal.cs_ndir; if (numdirs < 1024) numdirs = 1024; if (numdirs > maxino + 1) numdirs = maxino + 1; dirhash = numdirs; inplast = 0; listmax = numdirs + 10; inpsort = (struct inoinfo **)calloc((unsigned)listmax, sizeof(struct inoinfo *)); inphead = (struct inoinfo **)calloc((unsigned)numdirs, sizeof(struct inoinfo *)); if (inpsort == NULL || inphead == NULL) { pwarn("cannot alloc %u bytes for inphead\n", (unsigned)(numdirs * sizeof(struct inoinfo *))); goto badsblabel; } cgrp = malloc(sblock->fs_cgsize); if (cgrp == NULL) { pwarn("cannot alloc %u bytes for cylinder group\n", sblock->fs_cgsize); goto badsblabel; } bufinit(); if (sblock->fs_flags & FS_DOSOFTDEP) usedsoftdep = 1; else usedsoftdep = 0; { struct partition *pp = 0; if (!forceimage && lp) pp = getdisklabelpart(dev,lp); if (pp && (pp->p_fstype == FS_APPLEUFS)) { isappleufs = 1; } } if (readappleufs()) { isappleufs = 1; } dirblksiz = DIRBLKSIZ; if (isappleufs) dirblksiz = APPLEUFS_DIRBLKSIZ; if (debug) printf("isappleufs = %d, dirblksiz = %d\n", isappleufs, dirblksiz); return (1); badsblabel: markclean=0; ckfini(); return (0); } static int readappleufs(void) { daddr_t label = APPLEUFS_LABEL_OFFSET / dev_bsize; struct appleufslabel *appleufs; int i; /* XXX do we have to deal with APPLEUFS_LABEL_OFFSET not * being block aligned (CD's?) */ if (bread(fsreadfd, (char *)appleufsblk.b_un.b_fs, label, (long)APPLEUFS_LABEL_SIZE) != 0) return 0; appleufsblk.b_bno = label; appleufsblk.b_size = APPLEUFS_LABEL_SIZE; appleufs = appleufsblk.b_un.b_appleufs; if (ntohl(appleufs->ul_magic) != APPLEUFS_LABEL_MAGIC) { if (!isappleufs) { return 0; } else { pfatal("MISSING APPLEUFS VOLUME LABEL\n"); if (reply("FIX") == 0) { return 1; } ffs_appleufs_set(appleufs, NULL, -1, 0); appleufsdirty(); } } if (ntohl(appleufs->ul_version) != APPLEUFS_LABEL_VERSION) { pwarn("INCORRECT APPLE UFS VERSION NUMBER (%d should be %d)", ntohl(appleufs->ul_version),APPLEUFS_LABEL_VERSION); if (preen) { printf(" (CORRECTED)\n"); } if (preen || reply("CORRECT")) { appleufs->ul_version = htonl(APPLEUFS_LABEL_VERSION); appleufsdirty(); } } if (ntohs(appleufs->ul_namelen) > APPLEUFS_MAX_LABEL_NAME) { pwarn("APPLE UFS LABEL NAME TOO LONG"); if (preen) { printf(" (TRUNCATED)\n"); } if (preen || reply("TRUNCATE")) { appleufs->ul_namelen = htons(APPLEUFS_MAX_LABEL_NAME); appleufsdirty(); } } if (ntohs(appleufs->ul_namelen) == 0) { pwarn("MISSING APPLE UFS LABEL NAME"); if (preen) { printf(" (FIXED)\n"); } if (preen || reply("FIX")) { ffs_appleufs_set(appleufs, NULL, -1, 0); appleufsdirty(); } } /* Scan name for first illegal character */ for (i=0;iul_namelen);i++) { if ((appleufs->ul_name[i] == '\0') || (appleufs->ul_name[i] == ':') || (appleufs->ul_name[i] == '/')) { pwarn("APPLE UFS LABEL NAME CONTAINS ILLEGAL CHARACTER"); if (preen) { printf(" (TRUNCATED)\n"); } if (preen || reply("TRUNCATE")) { appleufs->ul_namelen = i+1; appleufsdirty(); } break; } } /* Check the checksum last, because if anything else was wrong, * then the checksum gets reset anyway. */ appleufs->ul_checksum = 0; appleufs->ul_checksum = ffs_appleufs_cksum(appleufs); if (appleufsblk.b_un.b_appleufs->ul_checksum != appleufs->ul_checksum) { pwarn("INVALID APPLE UFS CHECKSUM (%#04x should be %#04x)", appleufsblk.b_un.b_appleufs->ul_checksum, appleufs->ul_checksum); if (preen) { printf(" (CORRECTED)\n"); } if (preen || reply("CORRECT")) { appleufsdirty(); } else { /* put the incorrect checksum back in place */ appleufs->ul_checksum = appleufsblk.b_un.b_appleufs->ul_checksum; } } return 1; } /* * Detect byte order. Return 0 if valid magic found, -1 otherwise. */ static int detect_byteorder(struct fs *fs, int sblockoff) { if (sblockoff == SBLOCK_UFS2 && (fs->fs_magic == FS_UFS1_MAGIC || fs->fs_magic == bswap32(FS_UFS1_MAGIC))) /* Likely to be the first alternate of a fs with 64k blocks */ return -1; if (fs->fs_magic == FS_UFS1_MAGIC || fs->fs_magic == FS_UFS2_MAGIC) { if (endian == 0 || BYTE_ORDER == endian) { needswap = 0; doswap = do_blkswap = do_dirswap = 0; } else { needswap = 1; doswap = do_blkswap = do_dirswap = 1; } return 0; } else if (fs->fs_magic == bswap32(FS_UFS1_MAGIC) || fs->fs_magic == bswap32(FS_UFS2_MAGIC)) { if (endian == 0 || BYTE_ORDER != endian) { needswap = 1; doswap = do_blkswap = do_dirswap = 0; } else { needswap = 0; doswap = do_blkswap = do_dirswap = 1; } return 0; } return -1; } /* * Possible superblock locations ordered from most to least likely. */ static off_t sblock_try[] = SBLOCKSEARCH; /* * Read in the super block and its summary info. */ static int readsb(int listerr) { daddr_t super = 0; struct fs *fs; int i; if (bflag) { super = bflag; if (bread(fsreadfd, (char *)sblk.b_un.b_fs, super, (long)SBLOCKSIZE) != 0) return (0); fs = sblk.b_un.b_fs; if (detect_byteorder(fs, -1) < 0) { badsb(listerr, "MAGIC NUMBER WRONG"); return (0); } } else { for (i = 0; sblock_try[i] != -1; i++) { super = sblock_try[i] / dev_bsize; if (bread(fsreadfd, (char *)sblk.b_un.b_fs, super, (long)SBLOCKSIZE) != 0) continue; fs = sblk.b_un.b_fs; if (detect_byteorder(fs, sblock_try[i]) == 0) break; } if (sblock_try[i] == -1) { badsb(listerr, "CAN'T FIND SUPERBLOCK"); return (0); } } if (doswap) { if (preen) errx(EEXIT, "incompatible options -B and -p"); if (nflag) errx(EEXIT, "incompatible options -B and -n"); if (endian == LITTLE_ENDIAN) { if (!reply("CONVERT TO LITTLE ENDIAN")) return 0; } else if (endian == BIG_ENDIAN) { if (!reply("CONVERT TO BIG ENDIAN")) return 0; } else pfatal("INTERNAL ERROR: unknown endian"); } if (needswap) pwarn("** Swapped byte order\n"); /* swap SB byte order if asked */ if (doswap) ffs_sb_swap(sblk.b_un.b_fs, sblk.b_un.b_fs); memmove(sblock, sblk.b_un.b_fs, SBLOCKSIZE); if (needswap) ffs_sb_swap(sblk.b_un.b_fs, sblock); is_ufs2 = sblock->fs_magic == FS_UFS2_MAGIC; /* * run a few consistency checks of the super block */ if (sblock->fs_sbsize > SBLOCKSIZE) { badsb(listerr, "SIZE PREPOSTEROUSLY LARGE"); return (0); } /* * Compute block size that the filesystem is based on, * according to fsbtodb, and adjust superblock block number * so we can tell if this is an alternate later. */ super *= dev_bsize; dev_bsize = sblock->fs_fsize / fsbtodb(sblock, 1); sblk.b_bno = super / dev_bsize; sblk.b_size = SBLOCKSIZE; if (bflag) goto out; /* * Set all possible fields that could differ, then do check * of whole super block against an alternate super block-> * When an alternate super-block is specified this check is skipped. */ getblk(&asblk, cgsblock(sblock, sblock->fs_ncg - 1), sblock->fs_sbsize); if (asblk.b_errs) return (0); /* swap SB byte order if asked */ if (doswap) ffs_sb_swap(asblk.b_un.b_fs, asblk.b_un.b_fs); memmove(altsblock, asblk.b_un.b_fs, sblock->fs_sbsize); if (needswap) ffs_sb_swap(asblk.b_un.b_fs, altsblock); if (cmpsblks(sblock, altsblock)) { if (debug) { uint32_t *nlp, *olp, *endlp; printf("superblock mismatches\n"); nlp = (uint32_t *)altsblock; olp = (uint32_t *)sblock; endlp = olp + (sblock->fs_sbsize / sizeof *olp); for ( ; olp < endlp; olp++, nlp++) { if (*olp == *nlp) continue; printf("offset %#x, original 0x%08x, alternate " "0x%08x\n", (int)((uint8_t *)olp-(uint8_t *)sblock), *olp, *nlp); } } badsb(listerr, "VALUES IN SUPER BLOCK DISAGREE WITH THOSE IN FIRST ALTERNATE"); return (0); } out: sb_oldfscompat_read(sblock, &sblocksave); /* Now we know the SB is valid, we can write it back if needed */ if (doswap) { sbdirty(); dirty(&asblk); } havesb = 1; return (1); } int cmpsblks(const struct fs *sb, struct fs *asb) { if (!is_ufs2 && ((sb->fs_old_flags & FS_FLAGS_UPDATED) == 0)) { if (sb->fs_old_postblformat < FS_DYNAMICPOSTBLFMT) return cmpsblks42(sb, asb); else return cmpsblks44(sb, asb); } if (asb->fs_sblkno != sb->fs_sblkno || asb->fs_cblkno != sb->fs_cblkno || asb->fs_iblkno != sb->fs_iblkno || asb->fs_dblkno != sb->fs_dblkno || asb->fs_ncg != sb->fs_ncg || asb->fs_bsize != sb->fs_bsize || asb->fs_fsize != sb->fs_fsize || asb->fs_frag != sb->fs_frag || asb->fs_bmask != sb->fs_bmask || asb->fs_fmask != sb->fs_fmask || asb->fs_bshift != sb->fs_bshift || asb->fs_fshift != sb->fs_fshift || asb->fs_fragshift != sb->fs_fragshift || asb->fs_fsbtodb != sb->fs_fsbtodb || asb->fs_sbsize != sb->fs_sbsize || asb->fs_nindir != sb->fs_nindir || asb->fs_inopb != sb->fs_inopb || asb->fs_cssize != sb->fs_cssize || asb->fs_ipg != sb->fs_ipg || asb->fs_fpg != sb->fs_fpg || asb->fs_magic != sb->fs_magic) return 1; return 0; } /* BSD 4.2 performed the following superblock comparison * It should correspond to FS_42POSTBLFMT * (although note that in 4.2, the fs_old_postblformat * field didn't exist and the corresponding bits are * located near the end of the postbl itself, where they * are not likely to be used.) */ int cmpsblks42(const struct fs *sb, struct fs *asb) { asb->fs_firstfield = sb->fs_firstfield; /* fs_link */ asb->fs_unused_1 = sb->fs_unused_1; /* fs_rlink */ asb->fs_old_time = sb->fs_old_time; /* fs_time */ asb->fs_old_cstotal = sb->fs_old_cstotal; /* fs_cstotal */ asb->fs_cgrotor = sb->fs_cgrotor; asb->fs_fmod = sb->fs_fmod; asb->fs_clean = sb->fs_clean; asb->fs_ronly = sb->fs_ronly; asb->fs_old_flags = sb->fs_old_flags; asb->fs_maxcontig = sb->fs_maxcontig; asb->fs_minfree = sb->fs_minfree; asb->fs_old_rotdelay = sb->fs_old_rotdelay; asb->fs_maxbpg = sb->fs_maxbpg; /* The former fs_csp, totaling 128 bytes */ memmove(asb->fs_ocsp, sb->fs_ocsp, sizeof sb->fs_ocsp); asb->fs_contigdirs = sb->fs_contigdirs; asb->fs_csp = sb->fs_csp; asb->fs_maxcluster = sb->fs_maxcluster; asb->fs_active = sb->fs_active; /* The former fs_fsmnt, totaling 512 bytes */ memmove(asb->fs_fsmnt, sb->fs_fsmnt, sizeof sb->fs_fsmnt); memmove(asb->fs_volname, sb->fs_volname, sizeof sb->fs_volname); return memcmp(sb, asb, sb->fs_sbsize); } /* BSD 4.4 performed the following superblock comparison * This was used in NetBSD through 1.6.1 * * Note that this implementation is destructive to asb. */ int cmpsblks44(const struct fs *sb, struct fs *asb) { /* * "Copy fields which we don't care if they're different in the * alternate superblocks, as they're either likely to be * different because they're per-cylinder-group specific, or * because they're transient details which are only maintained * in the primary superblock." */ asb->fs_firstfield = sb->fs_firstfield; asb->fs_unused_1 = sb->fs_unused_1; asb->fs_old_time = sb->fs_old_time; asb->fs_old_cstotal = sb->fs_old_cstotal; asb->fs_cgrotor = sb->fs_cgrotor; asb->fs_fmod = sb->fs_fmod; asb->fs_clean = sb->fs_clean; asb->fs_ronly = sb->fs_ronly; asb->fs_old_flags = sb->fs_old_flags; asb->fs_maxcontig = sb->fs_maxcontig; asb->fs_minfree = sb->fs_minfree; asb->fs_optim = sb->fs_optim; asb->fs_old_rotdelay = sb->fs_old_rotdelay; asb->fs_maxbpg = sb->fs_maxbpg; /* The former fs_csp and fs_maxcluster, totaling 128 bytes */ memmove(asb->fs_ocsp, sb->fs_ocsp, sizeof sb->fs_ocsp); asb->fs_contigdirs = sb->fs_contigdirs; asb->fs_csp = sb->fs_csp; asb->fs_maxcluster = sb->fs_maxcluster; asb->fs_active = sb->fs_active; /* The former fs_fsmnt, totaling 512 bytes */ memmove(asb->fs_fsmnt, sb->fs_fsmnt, sizeof sb->fs_fsmnt); memmove(asb->fs_volname, sb->fs_volname, sizeof sb->fs_volname); /* The former fs_sparecon, totaling 200 bytes */ memmove(asb->fs_snapinum, sb->fs_snapinum, sizeof sb->fs_snapinum); asb->fs_avgfilesize = sb->fs_avgfilesize; asb->fs_avgfpdir = sb->fs_avgfpdir; asb->fs_save_cgsize = sb->fs_save_cgsize; memmove(asb->fs_sparecon32, sb->fs_sparecon32, sizeof sb->fs_sparecon32); asb->fs_flags = sb->fs_flags; /* Original comment: * "The following should not have to be copied, but need to be." */ asb->fs_fsbtodb = sb->fs_fsbtodb; asb->fs_old_interleave = sb->fs_old_interleave; asb->fs_old_npsect = sb->fs_old_npsect; asb->fs_old_nrpos = sb->fs_old_nrpos; asb->fs_state = sb->fs_state; asb->fs_qbmask = sb->fs_qbmask; asb->fs_qfmask = sb->fs_qfmask; asb->fs_state = sb->fs_state; asb->fs_maxfilesize = sb->fs_maxfilesize; /* * "Compare the superblocks, effectively checking every other * field to see if they differ." */ return memcmp(sb, asb, sb->fs_sbsize); } static void badsb(int listerr, const char *s) { if (!listerr) return; if (preen) printf("%s: ", cdevname()); pfatal("BAD SUPER BLOCK: %s\n", s); } /* * Calculate a prototype superblock based on information in the disk label. * When done the cgsblock macro can be calculated and the fs_ncg field * can be used. Do NOT attempt to use other macros without verifying that * their needed information is available! */ static int calcsb(const char *dev, int devfd, struct fs *fs) { struct disklabel *lp; struct partition *pp; int i, nspf; lp = getdisklabel(dev, devfd); pp = getdisklabelpart(dev,lp); if (pp == 0) { pfatal("%s: CANNOT FIGURE OUT FILE SYSTEM PARTITION\n", dev); return (0); } if ((pp->p_fstype != FS_BSDFFS) && (pp->p_fstype != FS_APPLEUFS)) { pfatal("%s: NOT LABELED AS A BSD FILE SYSTEM (%s)\n", dev, pp->p_fstype < FSMAXTYPES ? fstypenames[pp->p_fstype] : "unknown"); return (0); } /* avoid divide by 0 */ if (pp->p_fsize == 0 || pp->p_frag == 0 || pp->p_cpg == 0) { pfatal("%s: LABEL DOES NOT CONTAIN FILE SYSTEM PARAMETERS\n", dev); return (0); } memset(fs, 0, sizeof(struct fs)); fs->fs_fsize = pp->p_fsize; fs->fs_frag = pp->p_frag; fs->fs_size = pp->p_size; fs->fs_sblkno = roundup( howmany(lp->d_bbsize + lp->d_sbsize, fs->fs_fsize), fs->fs_frag); nspf = fs->fs_fsize / lp->d_secsize; fs->fs_old_nspf = nspf; for (fs->fs_fsbtodb = 0, i = nspf; i > 1; i >>= 1) fs->fs_fsbtodb++; dev_bsize = lp->d_secsize; if (fs->fs_magic == FS_UFS2_MAGIC) { fs->fs_fpg = pp->p_cpg; fs->fs_ncg = howmany(fs->fs_size, fs->fs_fpg); } else /* if (fs->fs_magic == FS_UFS1_MAGIC) */ { fs->fs_old_cpg = pp->p_cpg; fs->fs_old_cgmask = 0xffffffff; for (i = lp->d_ntracks; i > 1; i >>= 1) fs->fs_old_cgmask <<= 1; if (!POWEROF2(lp->d_ntracks)) fs->fs_old_cgmask <<= 1; fs->fs_old_cgoffset = roundup( howmany(lp->d_nsectors, nspf), fs->fs_frag); fs->fs_fpg = (fs->fs_old_cpg * lp->d_secpercyl) / nspf; fs->fs_ncg = howmany(fs->fs_size / lp->d_secpercyl, fs->fs_old_cpg); } return (1); } static struct disklabel * getdisklabel(const char *s, int fd) { static struct disklabel lab; if (ioctl(fd, DIOCGDINFO, (char *)&lab) < 0) { if (s == NULL) return ((struct disklabel *)NULL); pwarn("ioctl (GCINFO): %s\n", strerror(errno)); errx(EEXIT, "%s: can't read disk label", s); } return (&lab); } static struct partition * getdisklabelpart(const char *dev, struct disklabel *lp) { char *cp; int c; cp = strchr(dev, '\0'); if (cp == dev) return NULL; c = (unsigned char)cp[-1]; if (isdigit(c)) /* eg "wd0", return info for first partition */ return &lp->d_partitions[0]; if (c >= 'a' && c <= 'p') /* eg "wd0f", return info for specified partition */ return &lp->d_partitions[c - 'a']; return NULL; }