/* $OpenBSD: setup.c,v 1.31 2017/08/26 06:32:06 otto Exp $ */ /* $NetBSD: setup.c,v 1.1 1997/06/11 11:22:01 bouyer Exp $ */ /* * Copyright (c) 1997 Manuel Bouyer. * 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. */ #define DKTYPENAMES #include /* DEV_BSIZE roundup */ #include #include #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) void badsb(int, char *); int calcsb(char *, int, struct m_ext2fs *, struct disklabel *); static struct disklabel *getdisklabel(char *, int); static int readsb(int); int setup(char *dev) { long cg, asked, i; long bmapsize; struct disklabel *lp; off_t sizepb; struct stat statb; struct m_ext2fs proto; int doskipclean; u_int64_t maxfilesize; havesb = 0; fswritefd = -1; doskipclean = skipclean; if (stat(dev, &statb) < 0) { printf("Can't stat %s: %s\n", dev, strerror(errno)); return (0); } if (!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 (preen == 0) printf("** %s", dev); if (nflag || (fswritefd = open(dev, O_WRONLY)) < 0) { fswritefd = -1; if (preen) pfatal("NO WRITE ACCESS"); printf(" (NO WRITE)"); } if (preen == 0) printf("\n"); fsmodified = 0; lfdir = 0; initbarea(&sblk); initbarea(&asblk); sblk.b_un.b_buf = malloc(SBSIZE); asblk.b_un.b_buf = malloc(SBSIZE); if (sblk.b_un.b_buf == NULL || asblk.b_un.b_buf == NULL) errexit("cannot allocate space for superblock\n"); if ((lp = getdisklabel(NULL, fsreadfd)) != NULL) secsize = lp->d_secsize; else secsize = DEV_BSIZE; if (!hotroot()) { #ifndef SMALL if (pledge("stdio getpw", NULL) == -1) err(1, "pledge"); #else if (pledge("stdio", NULL) == -1) err(1, "pledge"); #endif } /* * Read in the superblock, looking for alternates if necessary */ if (readsb(1) == 0) { if (bflag || preen || calcsb(dev, fsreadfd, &proto, lp) == 0) return(0); if (reply("LOOK FOR ALTERNATE SUPERBLOCKS") == 0) return (0); for (cg = 1; cg < proto.e2fs_ncg; cg++) { bflag = fsbtodb(&proto, cg * proto.e2fs.e2fs_bpg + proto.e2fs.e2fs_first_dblock); if (readsb(0) != 0) break; } if (cg >= proto.e2fs_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_ext2fs(8)."); return(0); } doskipclean = 0; pwarn("USING ALTERNATE SUPERBLOCK AT %d\n", bflag); } if (debug) printf("state = %d\n", sblock.e2fs.e2fs_state); if (sblock.e2fs.e2fs_state == E2FS_ISCLEAN) { if (doskipclean) { pwarn("%sile system is clean; not checking\n", preen ? "f" : "** F"); return (-1); } if (!preen) pwarn("** File system is already clean\n"); } maxfsblock = sblock.e2fs.e2fs_bcount; maxino = sblock.e2fs_ncg * sblock.e2fs.e2fs_ipg; sizepb = sblock.e2fs_bsize; maxfilesize = sblock.e2fs_bsize * NDADDR - 1; for (i = 0; i < NIADDR; i++) { sizepb *= NINDIR(&sblock); maxfilesize += sizepb; } /* * Check and potentially fix certain fields in the super block. */ if (/* (sblock.e2fs.e2fs_rbcount < 0) || */ (sblock.e2fs.e2fs_rbcount > sblock.e2fs.e2fs_bcount)) { pfatal("IMPOSSIBLE RESERVED BLOCK COUNT=%d IN SUPERBLOCK", sblock.e2fs.e2fs_rbcount); if (reply("SET TO DEFAULT") == 1) { sblock.e2fs.e2fs_rbcount = sblock.e2fs.e2fs_bcount * 0.1; sbdirty(); dirty(&asblk); } } if (sblock.e2fs.e2fs_bpg != sblock.e2fs.e2fs_fpg) { pfatal("WRONG FPG=%d (BPG=%d) IN SUPERBLOCK", sblock.e2fs.e2fs_fpg, sblock.e2fs.e2fs_bpg); return 0; } if (asblk.b_dirty && !bflag) { copyback_sb(&asblk); flush(fswritefd, &asblk); } /* * read in the summary info. */ sblock.e2fs_gd = calloc(sblock.e2fs_ngdb, sblock.e2fs_bsize); if (sblock.e2fs_gd == NULL) errexit("out of memory\n"); asked = 0; for (i=0; i < sblock.e2fs_ngdb; i++) { if (bread(fsreadfd,(char *) &sblock.e2fs_gd[i* sblock.e2fs_bsize / sizeof(struct ext2_gd)], fsbtodb(&sblock, ((sblock.e2fs_bsize>1024)?0:1)+i+1), sblock.e2fs_bsize) != 0 && !asked) { pfatal("BAD SUMMARY INFORMATION"); if (reply("CONTINUE") == 0) errexit("%s\n", ""); asked++; } } /* * allocate and initialize the necessary maps */ bmapsize = roundup(howmany(maxfsblock, NBBY), sizeof(int16_t)); blockmap = calloc((unsigned)bmapsize, sizeof (char)); if (blockmap == NULL) { printf("cannot alloc %u bytes for blockmap\n", (unsigned)bmapsize); goto badsblabel; } statemap = calloc((unsigned)(maxino + 2), sizeof(char)); if (statemap == NULL) { printf("cannot alloc %u bytes for statemap\n", (unsigned)(maxino + 1)); goto badsblabel; } typemap = calloc((unsigned)(maxino + 1), sizeof(u_char)); if (typemap == NULL) { printf("cannot alloc %u bytes for typemap\n", (unsigned)(maxino + 1)); goto badsblabel; } lncntp = calloc((unsigned)(maxino + 1), sizeof(int16_t)); if (lncntp == NULL) { printf("cannot alloc %u bytes for lncntp\n", (unsigned)((maxino + 1) * sizeof(int16_t))); goto badsblabel; } for (numdirs = 0, cg = 0; cg < sblock.e2fs_ncg; cg++) { numdirs += letoh16(sblock.e2fs_gd[cg].ext2bgd_ndirs); } inplast = 0; listmax = numdirs + 10; inpsort = calloc((unsigned)listmax, sizeof(struct inoinfo *)); inphead = calloc((unsigned)numdirs, sizeof(struct inoinfo *)); if (inpsort == NULL || inphead == NULL) { printf("cannot alloc %u bytes for inphead\n", (unsigned)(numdirs * sizeof(struct inoinfo *))); goto badsblabel; } bufinit(); return (1); badsblabel: ckfini(0); return (0); } /* * Read in the super block and its summary info. */ static int readsb(int listerr) { daddr32_t super = bflag ? bflag : SBOFF / DEV_BSIZE; if (bread(fsreadfd, (char *)sblk.b_un.b_fs, super, (long)SBSIZE) != 0) return (0); sblk.b_bno = super; sblk.b_size = SBSIZE; /* Copy the superblock in memory */ e2fs_sbload(sblk.b_un.b_fs, &sblock.e2fs); /* * run a few consistency checks of the super block */ if (sblock.e2fs.e2fs_magic != E2FS_MAGIC) { badsb(listerr, "MAGIC NUMBER WRONG"); return (0); } if (sblock.e2fs.e2fs_log_bsize > 2) { badsb(listerr, "BAD LOG_BSIZE"); return (0); } if (sblock.e2fs.e2fs_bpg == 0) { badsb(listerr, "BAD BLOCKS PER GROUP"); return (0); } /* compute the dynamic fields of the in-memory sb */ /* compute dynamic sb infos */ sblock.e2fs_ncg = howmany(sblock.e2fs.e2fs_bcount - sblock.e2fs.e2fs_first_dblock, sblock.e2fs.e2fs_bpg); /* XXX assume hw bsize = 512 */ sblock.e2fs_fsbtodb = sblock.e2fs.e2fs_log_bsize + 1; sblock.e2fs_bsize = 1024 << sblock.e2fs.e2fs_log_bsize; sblock.e2fs_bshift = LOG_MINBSIZE + sblock.e2fs.e2fs_log_bsize; sblock.e2fs_qbmask = sblock.e2fs_bsize - 1; sblock.e2fs_bmask = ~sblock.e2fs_qbmask; sblock.e2fs_ngdb = howmany(sblock.e2fs_ncg, sblock.e2fs_bsize / sizeof(struct ext2_gd)); sblock.e2fs_ipb = sblock.e2fs_bsize / EXT2_DINODE_SIZE(&sblock); sblock.e2fs_itpg = sblock.e2fs.e2fs_ipg/sblock.e2fs_ipb; /* * 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. */ sblk.b_bno = super / DEV_BSIZE; if (sblock.e2fs_ncg == 1) { /* no alternate superblock; assume it's okey */ havesb = 1; return 1; } getblk(&asblk, 1 * sblock.e2fs.e2fs_bpg + sblock.e2fs.e2fs_first_dblock, (long)SBSIZE); if (asblk.b_errs) return (0); if (bflag) { havesb = 1; return (1); } /* * 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. */ asblk.b_un.b_fs->e2fs_rbcount = sblk.b_un.b_fs->e2fs_rbcount; asblk.b_un.b_fs->e2fs_fbcount = sblk.b_un.b_fs->e2fs_fbcount; asblk.b_un.b_fs->e2fs_ficount = sblk.b_un.b_fs->e2fs_ficount; asblk.b_un.b_fs->e2fs_mtime = sblk.b_un.b_fs->e2fs_mtime; asblk.b_un.b_fs->e2fs_wtime = sblk.b_un.b_fs->e2fs_wtime; asblk.b_un.b_fs->e2fs_mnt_count = sblk.b_un.b_fs->e2fs_mnt_count; asblk.b_un.b_fs->e2fs_max_mnt_count = sblk.b_un.b_fs->e2fs_max_mnt_count; asblk.b_un.b_fs->e2fs_state = sblk.b_un.b_fs->e2fs_state; asblk.b_un.b_fs->e2fs_beh = sblk.b_un.b_fs->e2fs_beh; asblk.b_un.b_fs->e2fs_lastfsck = sblk.b_un.b_fs->e2fs_lastfsck; asblk.b_un.b_fs->e2fs_fsckintv = sblk.b_un.b_fs->e2fs_fsckintv; asblk.b_un.b_fs->e2fs_ruid = sblk.b_un.b_fs->e2fs_ruid; asblk.b_un.b_fs->e2fs_rgid = sblk.b_un.b_fs->e2fs_rgid; asblk.b_un.b_fs->e2fs_block_group_nr = sblk.b_un.b_fs->e2fs_block_group_nr; asblk.b_un.b_fs->e2fs_features_rocompat &= ~EXT2F_ROCOMPAT_LARGEFILE; asblk.b_un.b_fs->e2fs_features_rocompat |= sblk.b_un.b_fs->e2fs_features_rocompat & EXT2F_ROCOMPAT_LARGEFILE; if (sblock.e2fs.e2fs_rev > E2FS_REV0 && ((sblock.e2fs.e2fs_features_incompat & ~EXT2F_INCOMPAT_SUPP) || (sblock.e2fs.e2fs_features_rocompat & ~EXT2F_ROCOMPAT_SUPP))) { if (debug) { printf("compat 0x%08x, incompat 0x%08x, compat_ro " "0x%08x\n", sblock.e2fs.e2fs_features_compat, sblock.e2fs.e2fs_features_incompat, sblock.e2fs.e2fs_features_rocompat); } badsb(listerr,"INCOMPATIBLE FEATURE BITS IN SUPER BLOCK"); return 0; } if (memcmp(sblk.b_un.b_fs, asblk.b_un.b_fs, SBSIZE)) { if (debug) { u_int32_t *nlp, *olp, *endlp; printf("superblock mismatches\n"); nlp = (u_int32_t *)asblk.b_un.b_fs; olp = (u_int32_t *)sblk.b_un.b_fs; endlp = olp + (SBSIZE / sizeof *olp); for ( ; olp < endlp; olp++, nlp++) { if (*olp == *nlp) continue; printf("offset %ld, original %ld, alternate %ld\n", (long)(olp - (u_int32_t *)sblk.b_un.b_fs), (long)letoh32(*olp), (long)letoh32(*nlp)); } } badsb(listerr, "VALUES IN SUPER BLOCK DISAGREE WITH THOSE IN FIRST ALTERNATE"); return (0); } havesb = 1; return (1); } void copyback_sb(struct bufarea *bp) { /* Copy the in-memory superblock back to buffer */ bp->b_un.b_fs->e2fs_icount = letoh32(sblock.e2fs.e2fs_icount); bp->b_un.b_fs->e2fs_bcount = letoh32(sblock.e2fs.e2fs_bcount); bp->b_un.b_fs->e2fs_rbcount = letoh32(sblock.e2fs.e2fs_rbcount); bp->b_un.b_fs->e2fs_fbcount = letoh32(sblock.e2fs.e2fs_fbcount); bp->b_un.b_fs->e2fs_ficount = letoh32(sblock.e2fs.e2fs_ficount); bp->b_un.b_fs->e2fs_first_dblock = letoh32(sblock.e2fs.e2fs_first_dblock); bp->b_un.b_fs->e2fs_log_bsize = letoh32(sblock.e2fs.e2fs_log_bsize); bp->b_un.b_fs->e2fs_log_fsize = letoh32(sblock.e2fs.e2fs_log_fsize); bp->b_un.b_fs->e2fs_bpg = letoh32(sblock.e2fs.e2fs_bpg); bp->b_un.b_fs->e2fs_fpg = letoh32(sblock.e2fs.e2fs_fpg); bp->b_un.b_fs->e2fs_ipg = letoh32(sblock.e2fs.e2fs_ipg); bp->b_un.b_fs->e2fs_mtime = letoh32(sblock.e2fs.e2fs_mtime); bp->b_un.b_fs->e2fs_wtime = letoh32(sblock.e2fs.e2fs_wtime); bp->b_un.b_fs->e2fs_lastfsck = letoh32(sblock.e2fs.e2fs_lastfsck); bp->b_un.b_fs->e2fs_fsckintv = letoh32(sblock.e2fs.e2fs_fsckintv); bp->b_un.b_fs->e2fs_creator = letoh32(sblock.e2fs.e2fs_creator); bp->b_un.b_fs->e2fs_rev = letoh32(sblock.e2fs.e2fs_rev); bp->b_un.b_fs->e2fs_mnt_count = letoh16(sblock.e2fs.e2fs_mnt_count); bp->b_un.b_fs->e2fs_max_mnt_count = letoh16(sblock.e2fs.e2fs_max_mnt_count); bp->b_un.b_fs->e2fs_magic = letoh16(sblock.e2fs.e2fs_magic); bp->b_un.b_fs->e2fs_state = letoh16(sblock.e2fs.e2fs_state); bp->b_un.b_fs->e2fs_beh = letoh16(sblock.e2fs.e2fs_beh); bp->b_un.b_fs->e2fs_ruid = letoh16(sblock.e2fs.e2fs_ruid); bp->b_un.b_fs->e2fs_rgid = letoh16(sblock.e2fs.e2fs_rgid); } void badsb(int listerr, 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! */ int calcsb(char *dev, int devfd, struct m_ext2fs *fs, struct disklabel *lp) { struct partition *pp; char *cp; cp = strchr(dev, '\0'); if ((cp == NULL || (cp[-1] < 'a' || cp[-1] >= 'a' + MAXPARTITIONS)) && !isdigit((unsigned char)cp[-1])) { pfatal("%s: CANNOT FIGURE OUT FILE SYSTEM PARTITION\n", dev); return (0); } cp--; if (lp == NULL) pfatal("%s: CANNOT READ DISKLABEL\n", dev); if (isdigit((unsigned char)*cp)) pp = &lp->d_partitions[0]; else pp = &lp->d_partitions[*cp - 'a']; if (pp->p_fstype != FS_EXT2FS) { pfatal("%s: NOT LABELED AS A EXT2 FILE SYSTEM (%s)\n", dev, pp->p_fstype < FSMAXTYPES ? fstypenames[pp->p_fstype] : "unknown"); return (0); } memset(fs, 0, sizeof(struct m_ext2fs)); fs->e2fs_bsize = DISKLABELV1_FFS_FSIZE(pp->p_fragblock); /* XXX */ if (fs->e2fs_bsize == 0) { pfatal("%s: BLOCK SIZE DETERMINED TO BE ZERO\n", dev); return (0); } fs->e2fs.e2fs_log_bsize = fs->e2fs_bsize / 1024; fs->e2fs.e2fs_bcount = (pp->p_size * DEV_BSIZE) / fs->e2fs_bsize; fs->e2fs.e2fs_first_dblock = (fs->e2fs.e2fs_log_bsize == 0) ? 1 : 0; fs->e2fs.e2fs_bpg = fs->e2fs_bsize * NBBY; fs->e2fs_bshift = LOG_MINBSIZE + fs->e2fs.e2fs_log_bsize; fs->e2fs_qbmask = fs->e2fs_bsize - 1; fs->e2fs_bmask = ~fs->e2fs_qbmask; fs->e2fs_ncg = howmany(fs->e2fs.e2fs_bcount - fs->e2fs.e2fs_first_dblock, fs->e2fs.e2fs_bpg); fs->e2fs_fsbtodb = fs->e2fs.e2fs_log_bsize + 1; fs->e2fs_ngdb = howmany(fs->e2fs_ncg, fs->e2fs_bsize / sizeof(struct ext2_gd)); return (1); } static struct disklabel * getdisklabel(char *s, int fd) { static struct disklabel lab; if (ioctl(fd, DIOCGDINFO, (char *)&lab) < 0) { if (s == NULL) return (NULL); pwarn("ioctl (GCINFO): %s\n", strerror(errno)); errexit("%s: can't read disk label\n", s); } return (&lab); } daddr32_t cgoverhead(int c) { int overh; overh = 1 /* block bitmap */ + 1 /* inode bitmap */ + sblock.e2fs_itpg; if (sblock.e2fs.e2fs_rev > E2FS_REV0 && sblock.e2fs.e2fs_features_rocompat & EXT2F_ROCOMPAT_SPARSESUPER) { if (cg_has_sb(c) == 0) return overh; } overh += 1 + sblock.e2fs_ngdb; return overh; }