Expand PMF_FN_* macros.

[netbsd-mini2440.git] / sbin / newfs / mkfs.c

/*      $NetBSD: mkfs.c,v 1.105 2009/04/11 07:20:09 lukem Exp $ */

/*
 * Copyright (c) 1980, 1989, 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.
 */

/*
 * Copyright (c) 2002 Networks Associates Technology, Inc.
 * All rights reserved.
 *
 * This software was developed for the FreeBSD Project by Marshall
 * Kirk McKusick and Network Associates Laboratories, the Security
 * Research Division of Network Associates, Inc. under DARPA/SPAWAR
 * contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA CHATS
 * research program
 *
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. 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 <sys/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "@(#)mkfs.c      8.11 (Berkeley) 5/3/95";
#else
__RCSID("$NetBSD: mkfs.c,v 1.105 2009/04/11 07:20:09 lukem Exp $");
#endif
#endif /* not lint */

#include <sys/param.h>
#include <sys/mman.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <ufs/ufs/dinode.h>
#include <ufs/ufs/dir.h>
#include <ufs/ufs/ufs_bswap.h>
#include <ufs/ffs/fs.h>
#include <ufs/ffs/ffs_extern.h>
#include <sys/ioctl.h>
#include <sys/disklabel.h>

#include <err.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include <stddef.h>

#ifndef STANDALONE
#include <stdio.h>
#endif

#include "extern.h"

union dinode {
        struct ufs1_dinode dp1;
        struct ufs2_dinode dp2;
};

static void initcg(int, const struct timeval *);
static int fsinit(const struct timeval *, mode_t, uid_t, gid_t);
static int makedir(struct direct *, int);
static daddr_t alloc(int, int);
static void iput(union dinode *, ino_t);
static void rdfs(daddr_t, int, void *);
static void wtfs(daddr_t, int, void *);
static int isblock(struct fs *, unsigned char *, int);
static void clrblock(struct fs *, unsigned char *, int);
static void setblock(struct fs *, unsigned char *, int);
static int ilog2(int);
static void zap_old_sblock(int);
#ifdef MFS
static void calc_memfree(void);
static void *mkfs_malloc(size_t size);
#endif

/*
 * make file system for cylinder-group style file systems
 */
#define UMASK           0755

union {
        struct fs fs;
        char pad[SBLOCKSIZE];
} fsun;
#define sblock  fsun.fs

struct  csum *fscs_0;           /* first block of cylinder summaries */
struct  csum *fscs_next;        /* place for next summary */
struct  csum *fscs_end;         /* end of summary buffer */
struct  csum *fscs_reset;       /* place for next summary after write */
uint    fs_csaddr;              /* fragment number to write to */

union {
        struct cg cg;
        char pad[MAXBSIZE];
} cgun;
#define acg     cgun.cg

#define DIP(dp, field) \
        ((sblock.fs_magic == FS_UFS1_MAGIC) ? \
        (dp)->dp1.di_##field : (dp)->dp2.di_##field)

char *iobuf;
int iobufsize;                  /* size to end of 2nd inode block */
int iobuf_memsize;              /* Actual buffer size */

int     fsi, fso;

void
mkfs(const char *fsys, int fi, int fo,
    mode_t mfsmode, uid_t mfsuid, gid_t mfsgid)
{
        uint fragsperinodeblk, ncg, u;
        uint cgzero;
        uint64_t inodeblks, cgall;
        int32_t cylno, i, csfrags;
        int inodes_per_cg;
        struct timeval tv;
        long long sizepb;
        int len, col, delta, fld_width, max_cols;
        struct winsize winsize;

#ifndef STANDALONE
        gettimeofday(&tv, NULL);
#endif
#ifdef MFS
        if (mfs && !Nflag) {
                calc_memfree();
                if ((uint64_t)fssize * sectorsize > memleft)
                        fssize = memleft / sectorsize;
                if ((membase = mkfs_malloc(fssize * sectorsize)) == NULL)
                        exit(12);
        }
#endif
        fsi = fi;
        fso = fo;
        if (Oflag == 0) {
                sblock.fs_old_inodefmt = FS_42INODEFMT;
                sblock.fs_maxsymlinklen = 0;
                sblock.fs_old_flags = 0;
        } else {
                sblock.fs_old_inodefmt = FS_44INODEFMT;
                sblock.fs_maxsymlinklen = (Oflag == 1 ? MAXSYMLINKLEN_UFS1 :
                    MAXSYMLINKLEN_UFS2);
                sblock.fs_old_flags = FS_FLAGS_UPDATED;
                if (isappleufs)
                        sblock.fs_old_flags = 0;
                sblock.fs_flags = 0;
        }

        /*
         * collect and verify the filesystem density info
         */
        sblock.fs_avgfilesize = avgfilesize;
        sblock.fs_avgfpdir = avgfpdir;
        if (sblock.fs_avgfilesize <= 0) {
                printf("illegal expected average file size %d\n",
                    sblock.fs_avgfilesize);
                exit(14);
        }
        if (sblock.fs_avgfpdir <= 0) {
                printf("illegal expected number of files per directory %d\n",
                    sblock.fs_avgfpdir);
                exit(15);
        }
        /*
         * collect and verify the block and fragment sizes
         */
        sblock.fs_bsize = bsize;
        sblock.fs_fsize = fsize;
        if (!powerof2(sblock.fs_bsize)) {
                printf("block size must be a power of 2, not %d\n",
                    sblock.fs_bsize);
                exit(16);
        }
        if (!powerof2(sblock.fs_fsize)) {
                printf("fragment size must be a power of 2, not %d\n",
                    sblock.fs_fsize);
                exit(17);
        }
        if (sblock.fs_fsize < sectorsize) {
                printf("fragment size %d is too small, minimum is %d\n",
                    sblock.fs_fsize, sectorsize);
                exit(18);
        }
        if (sblock.fs_bsize < MINBSIZE) {
                printf("block size %d is too small, minimum is %d\n",
                    sblock.fs_bsize, MINBSIZE);
                exit(19);
        }
        if (sblock.fs_bsize > MAXBSIZE) {
                printf("block size %d is too large, maximum is %d\n",
                    sblock.fs_bsize, MAXBSIZE);
                exit(19);
        }
        if (sblock.fs_bsize < sblock.fs_fsize) {
                printf("block size (%d) cannot be smaller than fragment size (%d)\n",
                    sblock.fs_bsize, sblock.fs_fsize);
                exit(20);
        }

        if (maxbsize < bsize || !powerof2(maxbsize)) {
                sblock.fs_maxbsize = sblock.fs_bsize;
        } else if (sblock.fs_maxbsize > FS_MAXCONTIG * sblock.fs_bsize) {
                sblock.fs_maxbsize = FS_MAXCONTIG * sblock.fs_bsize;
        } else {
                sblock.fs_maxbsize = maxbsize;
        }
        sblock.fs_maxcontig = maxcontig;
        if (sblock.fs_maxcontig < sblock.fs_maxbsize / sblock.fs_bsize) {
                sblock.fs_maxcontig = sblock.fs_maxbsize / sblock.fs_bsize;
                if (verbosity > 0)
                        printf("Maxcontig raised to %d\n", sblock.fs_maxbsize);
        }
        if (sblock.fs_maxcontig > 1)
                sblock.fs_contigsumsize = MIN(sblock.fs_maxcontig,FS_MAXCONTIG);

        sblock.fs_bmask = ~(sblock.fs_bsize - 1);
        sblock.fs_fmask = ~(sblock.fs_fsize - 1);
        sblock.fs_qbmask = ~sblock.fs_bmask;
        sblock.fs_qfmask = ~sblock.fs_fmask;
        for (sblock.fs_bshift = 0, i = sblock.fs_bsize; i > 1; i >>= 1)
                sblock.fs_bshift++;
        for (sblock.fs_fshift = 0, i = sblock.fs_fsize; i > 1; i >>= 1)
                sblock.fs_fshift++;
        sblock.fs_frag = numfrags(&sblock, sblock.fs_bsize);
        for (sblock.fs_fragshift = 0, i = sblock.fs_frag; i > 1; i >>= 1)
                sblock.fs_fragshift++;
        if (sblock.fs_frag > MAXFRAG) {
                printf("fragment size %d is too small, "
                        "minimum with block size %d is %d\n",
                    sblock.fs_fsize, sblock.fs_bsize,
                    sblock.fs_bsize / MAXFRAG);
                exit(21);
        }
        sblock.fs_fsbtodb = ilog2(sblock.fs_fsize / sectorsize);
        sblock.fs_size = dbtofsb(&sblock, fssize);
        if (Oflag <= 1) {
                if ((uint64_t)sblock.fs_size >= 1ull << 31) {
                        printf("Too many fragments (0x%" PRIx64
                            ") for a FFSv1 filesystem\n", sblock.fs_size);
                        exit(22);
                }
                sblock.fs_magic = FS_UFS1_MAGIC;
                sblock.fs_sblockloc = SBLOCK_UFS1;
                sblock.fs_nindir = sblock.fs_bsize / sizeof(int32_t);
                sblock.fs_inopb = sblock.fs_bsize / sizeof(struct ufs1_dinode);
                sblock.fs_old_cgoffset = 0;
                sblock.fs_old_cgmask = 0xffffffff;
                sblock.fs_old_size = sblock.fs_size;
                sblock.fs_old_rotdelay = 0;
                sblock.fs_old_rps = 60;
                sblock.fs_old_nspf = sblock.fs_fsize / sectorsize;
                sblock.fs_old_cpg = 1;
                sblock.fs_old_interleave = 1;
                sblock.fs_old_trackskew = 0;
                sblock.fs_old_cpc = 0;
                sblock.fs_old_postblformat = FS_DYNAMICPOSTBLFMT;
                sblock.fs_old_nrpos = 1;
        } else {
                sblock.fs_magic = FS_UFS2_MAGIC;
                sblock.fs_sblockloc = SBLOCK_UFS2;
                sblock.fs_nindir = sblock.fs_bsize / sizeof(int64_t);
                sblock.fs_inopb = sblock.fs_bsize / sizeof(struct ufs2_dinode);
        }

        sblock.fs_sblkno =
            roundup(howmany(sblock.fs_sblockloc + SBLOCKSIZE, sblock.fs_fsize),
                sblock.fs_frag);
        sblock.fs_cblkno = (daddr_t)(sblock.fs_sblkno +
            roundup(howmany(SBLOCKSIZE, sblock.fs_fsize), sblock.fs_frag));
        sblock.fs_iblkno = sblock.fs_cblkno + sblock.fs_frag;
        sblock.fs_maxfilesize = sblock.fs_bsize * NDADDR - 1;
        for (sizepb = sblock.fs_bsize, i = 0; i < NIADDR; i++) {
                sizepb *= NINDIR(&sblock);
                sblock.fs_maxfilesize += sizepb;
        }

        /*
         * Calculate the number of blocks to put into each cylinder group.
         *
         * The cylinder group size is limited because the data structure
         * must fit into a single block.
         * We try to have as few cylinder groups as possible, with a proviso
         * that we create at least MINCYLGRPS (==4) except for small
         * filesystems.
         *
         * This algorithm works out how many blocks of inodes would be
         * needed to fill the entire volume at the specified density.
         * It then looks at how big the 'cylinder block' would have to
         * be and, assuming that it is linearly related to the number
         * of inodes and blocks how many cylinder groups are needed to
         * keep the cylinder block below the filesystem block size.
         *
         * The cylinder groups are then all created with the average size.
         *
         * Space taken by the red tape on cylinder groups other than the
         * first is ignored.
         */

        /* There must be space for 1 inode block and 2 data blocks */
        if (sblock.fs_size < sblock.fs_iblkno + 3 * sblock.fs_frag) {
                printf("Filesystem size %lld < minimum size of %d\n",
                    (long long)sblock.fs_size, sblock.fs_iblkno + 3 * sblock.fs_frag);
                exit(23);
        }
        if (num_inodes != 0)
                inodeblks = howmany(num_inodes, INOPB(&sblock));
        else {
                /*
                 * Calculate 'per inode block' so we can allocate less than
                 * 1 fragment per inode - useful for /dev.
                 */
                fragsperinodeblk = MAX(numfrags(&sblock,
                                        (uint64_t)density * INOPB(&sblock)), 1);
                inodeblks = (sblock.fs_size - sblock.fs_iblkno) /       
                        (sblock.fs_frag + fragsperinodeblk);
        }
        if (inodeblks == 0)
                inodeblks = 1;
        /* Ensure that there are at least 2 data blocks (or we fail below) */
        if (inodeblks > (uint64_t)(sblock.fs_size - sblock.fs_iblkno)/sblock.fs_frag - 2)
                inodeblks = (sblock.fs_size-sblock.fs_iblkno)/sblock.fs_frag-2;
        /* Even UFS2 limits number of inodes to 2^31 (fs_ipg is int32_t) */
        if (inodeblks * INOPB(&sblock) >= 1ull << 31)
                inodeblks = ((1ull << 31) - NBBY) / INOPB(&sblock);
        /*
         * See what would happen if we tried to use 1 cylinder group.
         * Assume space linear, so work out number of cylinder groups needed.
         */
        cgzero = CGSIZE_IF(&sblock, 0, 0);
        cgall = CGSIZE_IF(&sblock, inodeblks * INOPB(&sblock), sblock.fs_size);
        ncg = howmany(cgall - cgzero, sblock.fs_bsize - cgzero);
        if (ncg < MINCYLGRPS) {
                /*
                 * We would like to allocate MINCLYGRPS cylinder groups,
                 * but for small file sytems (especially ones with a lot
                 * of inodes) this is not desirable (or possible).
                 */
                u = sblock.fs_size / 2 / (sblock.fs_iblkno +
                                                inodeblks * sblock.fs_frag);
                if (u > ncg)
                        ncg = u;
                if (ncg > MINCYLGRPS)
                        ncg = MINCYLGRPS;
                if (ncg > inodeblks)
                        ncg = inodeblks;
        }
        /*
         * Put an equal number of blocks in each cylinder group.
         * Round up so we don't have more fragments in the last CG than
         * the earlier ones (does that matter?), but kill a block if the
         * CGSIZE becomes too big (only happens if there are a lot of CGs).
         */
        sblock.fs_fpg = roundup(howmany(sblock.fs_size, ncg), sblock.fs_frag);
        /* Round up the fragments/group so the bitmap bytes are full */
        sblock.fs_fpg = roundup(sblock.fs_fpg, NBBY);
        inodes_per_cg = ((inodeblks - 1) / ncg + 1) * INOPB(&sblock);

        i = CGSIZE_IF(&sblock, inodes_per_cg, sblock.fs_fpg);
        if (i > sblock.fs_bsize) {
                sblock.fs_fpg -= (i - sblock.fs_bsize) * NBBY;
                /* ... and recalculate how many cylinder groups we now need */
                ncg = howmany(sblock.fs_size, sblock.fs_fpg);
                inodes_per_cg = ((inodeblks - 1) / ncg + 1) * INOPB(&sblock);
        }
        sblock.fs_ipg = inodes_per_cg;
        /* Sanity check on our sums... */
        if ((int)CGSIZE(&sblock) > sblock.fs_bsize) {
                printf("CGSIZE miscalculated %d > %d\n",
                    (int)CGSIZE(&sblock), sblock.fs_bsize);
                exit(24);
        }

        sblock.fs_dblkno = sblock.fs_iblkno + sblock.fs_ipg / INOPF(&sblock);
        /* Check that the last cylinder group has enough space for the inodes */
        i = sblock.fs_size - sblock.fs_fpg * (ncg - 1ull);
        if (i < sblock.fs_dblkno) {
                /*
                 * Since we make all the cylinder groups the same size, the
                 * last will only be small if there are a large number of
                 * cylinder groups. If we pull even a fragment from each
                 * of the other groups then the last CG will be overfull.
                 * So we just kill the last CG.
                 */
                ncg--;
                sblock.fs_size -= i;
        }
        sblock.fs_ncg = ncg;

        sblock.fs_cgsize = fragroundup(&sblock, CGSIZE(&sblock));
        if (Oflag <= 1) {
                sblock.fs_old_spc = sblock.fs_fpg * sblock.fs_old_nspf;
                sblock.fs_old_nsect = sblock.fs_old_spc;
                sblock.fs_old_npsect = sblock.fs_old_spc;
                sblock.fs_old_ncyl = sblock.fs_ncg;
        }

        /*
         * Cylinder group summary information for each cylinder is written
         * into the first cylinder group.
         * Write this fragment by fragment, but doing the first CG last
         * (after we've taken stuff off for the structure itself and the
         * root directory.
         */
        sblock.fs_csaddr = cgdmin(&sblock, 0);
        sblock.fs_cssize =
            fragroundup(&sblock, sblock.fs_ncg * sizeof(struct csum));
        if (512 % sizeof *fscs_0)
                errx(1, "cylinder group summary doesn't fit in sectors");
        fscs_0 = mmap(0, 2 * sblock.fs_fsize, PROT_READ|PROT_WRITE,
                        MAP_ANON|MAP_PRIVATE, -1, 0);
        if (fscs_0 == MAP_FAILED)
                exit(39);
        memset(fscs_0, 0, 2 * sblock.fs_fsize);
        fs_csaddr = sblock.fs_csaddr;
        fscs_next = fscs_0;
        fscs_end = (void *)((char *)fscs_0 + 2 * sblock.fs_fsize);
        fscs_reset = (void *)((char *)fscs_0 + sblock.fs_fsize);
        /*
         * fill in remaining fields of the super block
         */
        sblock.fs_sbsize = fragroundup(&sblock, sizeof(struct fs));
        if (sblock.fs_sbsize > SBLOCKSIZE)
                sblock.fs_sbsize = SBLOCKSIZE;
        sblock.fs_minfree = minfree;
        sblock.fs_maxcontig = maxcontig;
        sblock.fs_maxbpg = maxbpg;
        sblock.fs_optim = opt;
        sblock.fs_cgrotor = 0;
        sblock.fs_pendingblocks = 0;
        sblock.fs_pendinginodes = 0;
        sblock.fs_cstotal.cs_ndir = 0;
        sblock.fs_cstotal.cs_nbfree = 0;
        sblock.fs_cstotal.cs_nifree = 0;
        sblock.fs_cstotal.cs_nffree = 0;
        sblock.fs_fmod = 0;
        sblock.fs_ronly = 0;
        sblock.fs_state = 0;
        sblock.fs_clean = FS_ISCLEAN;
        sblock.fs_ronly = 0;
        sblock.fs_id[0] = (long)tv.tv_sec;      /* XXXfvdl huh? */
        sblock.fs_id[1] = arc4random() & INT32_MAX;
        sblock.fs_fsmnt[0] = '\0';
        csfrags = howmany(sblock.fs_cssize, sblock.fs_fsize);
        sblock.fs_dsize = sblock.fs_size - sblock.fs_sblkno -
            sblock.fs_ncg * (sblock.fs_dblkno - sblock.fs_sblkno);
        sblock.fs_cstotal.cs_nbfree =
            fragstoblks(&sblock, sblock.fs_dsize) -
            howmany(csfrags, sblock.fs_frag);
        sblock.fs_cstotal.cs_nffree =
            fragnum(&sblock, sblock.fs_size) +
            (fragnum(&sblock, csfrags) > 0 ?
            sblock.fs_frag - fragnum(&sblock, csfrags) : 0);
        sblock.fs_cstotal.cs_nifree = sblock.fs_ncg * sblock.fs_ipg - ROOTINO;
        sblock.fs_cstotal.cs_ndir = 0;
        sblock.fs_dsize -= csfrags;
        sblock.fs_time = tv.tv_sec;
        if (Oflag <= 1) {
                sblock.fs_old_time = tv.tv_sec;
                sblock.fs_old_dsize = sblock.fs_dsize;
                sblock.fs_old_csaddr = sblock.fs_csaddr;
                sblock.fs_old_cstotal.cs_ndir = sblock.fs_cstotal.cs_ndir;
                sblock.fs_old_cstotal.cs_nbfree = sblock.fs_cstotal.cs_nbfree;
                sblock.fs_old_cstotal.cs_nifree = sblock.fs_cstotal.cs_nifree;
                sblock.fs_old_cstotal.cs_nffree = sblock.fs_cstotal.cs_nffree;
        }
        /*
         * Dump out summary information about file system.
         */
        if (verbosity > 0) {
#define B2MBFACTOR (1 / (1024.0 * 1024.0))
                printf("%s: %.1fMB (%lld sectors) block size %d, "
                       "fragment size %d\n",
                    fsys, (float)sblock.fs_size * sblock.fs_fsize * B2MBFACTOR,
                    (long long)fsbtodb(&sblock, sblock.fs_size),
                    sblock.fs_bsize, sblock.fs_fsize);
                printf("\tusing %d cylinder groups of %.2fMB, %d blks, "
                       "%d inodes.\n",
                    sblock.fs_ncg,
                    (float)sblock.fs_fpg * sblock.fs_fsize * B2MBFACTOR,
                    sblock.fs_fpg / sblock.fs_frag, sblock.fs_ipg);
#undef B2MBFACTOR
        }

        /*
         * allocate space for superblock, cylinder group map, and
         * two sets of inode blocks.
         */
        if (sblock.fs_bsize < SBLOCKSIZE)
                iobufsize = SBLOCKSIZE + 3 * sblock.fs_bsize;
        else
                iobufsize = 4 * sblock.fs_bsize;
        iobuf_memsize = iobufsize;
        if (!mfs && sblock.fs_magic == FS_UFS1_MAGIC) {
                /* A larger buffer so we can write multiple inode blks */
                iobuf_memsize += 14 * sblock.fs_bsize;
        }
        for (;;) {
                iobuf = mmap(0, iobuf_memsize, PROT_READ|PROT_WRITE,
                                MAP_ANON|MAP_PRIVATE, -1, 0);
                if (iobuf != MAP_FAILED)
                        break;
                if (iobuf_memsize != iobufsize) {
                        /* Try again with the smaller size */
                        iobuf_memsize = iobufsize;
                        continue;
                }
                printf("Cannot allocate I/O buffer\n");
                exit(38);
        }
        memset(iobuf, 0, iobuf_memsize);

        /*
         * We now start writing to the filesystem
         */

        if (!Nflag) {
                /*
                 * Validate the given file system size.
                 * Verify that its last block can actually be accessed.
                 * Convert to file system fragment sized units.
                 */
                if (fssize <= 0) {
                        printf("preposterous size %lld\n", (long long)fssize);
                        exit(13);
                }
                wtfs(fssize - 1, sectorsize, iobuf);

                /*
                 * Ensure there is nothing that looks like a filesystem
                 * superbock anywhere other than where ours will be.
                 * If fsck finds the wrong one all hell breaks loose!
                 */
                for (i = 0; ; i++) {
                        static const int sblocklist[] = SBLOCKSEARCH;
                        int sblkoff = sblocklist[i];
                        int sz;
                        if (sblkoff == -1)
                                break;
                        /* Remove main superblock */
                        zap_old_sblock(sblkoff);
                        /* and all possible locations for the first alternate */
                        sblkoff += SBLOCKSIZE;
                        for (sz = SBLOCKSIZE; sz <= 0x10000; sz <<= 1)
                                zap_old_sblock(roundup(sblkoff, sz));
                }

                if (isappleufs) {
                        struct appleufslabel appleufs;
                        ffs_appleufs_set(&appleufs, appleufs_volname,
                            tv.tv_sec, 0);
                        wtfs(APPLEUFS_LABEL_OFFSET/sectorsize,
                            APPLEUFS_LABEL_SIZE, &appleufs);
                } else {
                        struct appleufslabel appleufs;
                        /* Look for & zap any existing valid apple ufs labels */
                        rdfs(APPLEUFS_LABEL_OFFSET/sectorsize,
                            APPLEUFS_LABEL_SIZE, &appleufs);
                        if (ffs_appleufs_validate(fsys, &appleufs, NULL) == 0) {
                                memset(&appleufs, 0, sizeof(appleufs));
                                wtfs(APPLEUFS_LABEL_OFFSET/sectorsize,
                                    APPLEUFS_LABEL_SIZE, &appleufs);
                        }
                }
        }

        /*
         * Make a copy of the superblock into the buffer that we will be
         * writing out in each cylinder group.
         */
        memcpy(iobuf, &sblock, sizeof sblock);
        if (needswap)
                ffs_sb_swap(&sblock, (struct fs *)iobuf);
        if ((sblock.fs_old_flags & FS_FLAGS_UPDATED) == 0)
                memset(iobuf + offsetof(struct fs, fs_old_postbl_start),
                    0xff, 256);

        if (verbosity >= 3)
                printf("super-block backups (for fsck_ffs -b #) at:\n");
        /* If we are printing more than one line of numbers, line up columns */
        fld_width = verbosity < 4 ? 1 : snprintf(NULL, 0, "%" PRIu64, 
                (uint64_t)fsbtodb(&sblock, cgsblock(&sblock, sblock.fs_ncg-1)));
        /* Get terminal width */
        if (ioctl(fileno(stdout), TIOCGWINSZ, &winsize) == 0)
                max_cols = winsize.ws_col;
        else
                max_cols = 80;
        if (Nflag && verbosity == 3)
                /* Leave space to add " ..." after one row of numbers */
                max_cols -= 4;
#define BASE 0x10000    /* For some fixed-point maths */
        col = 0;
        delta = verbosity > 2 ? 0 : max_cols * BASE / sblock.fs_ncg;
        for (cylno = 0; cylno < sblock.fs_ncg; cylno++) {
                fflush(stdout);
                initcg(cylno, &tv);
                if (verbosity < 2)
                        continue;
                if (delta > 0) {
                        if (Nflag)
                                /* No point doing dots for -N */
                                break;
                        /* Print dots scaled to end near RH margin */
                        for (col += delta; col > BASE; col -= BASE)
                                printf(".");
                        continue;
                }
                /* Print superblock numbers */
                len = printf(" %*" PRIu64 "," + !col, fld_width,
                    (uint64_t)fsbtodb(&sblock, cgsblock(&sblock, cylno)));
                col += len;
                if (col + len < max_cols)
                        /* Next number fits */
                        continue;
                /* Next number won't fit, need a newline */
                if (verbosity <= 3) {
                        /* Print dots for subsequent cylinder groups */
                        delta = sblock.fs_ncg - cylno - 1;
                        if (delta != 0) {
                                if (Nflag) {
                                        printf(" ...");
                                        break;
                                }
                                delta = max_cols * BASE / delta;
                        }
                }
                col = 0;
                printf("\n");
        }
#undef BASE
        if (col > 0)
                printf("\n");
        if (Nflag)
                exit(0);

        /*
         * Now construct the initial file system,
         */
        if (fsinit(&tv, mfsmode, mfsuid, mfsgid) == 0 && mfs)
                errx(1, "Error making filesystem");
        sblock.fs_time = tv.tv_sec;
        if (Oflag <= 1) {
                sblock.fs_old_cstotal.cs_ndir = sblock.fs_cstotal.cs_ndir;
                sblock.fs_old_cstotal.cs_nbfree = sblock.fs_cstotal.cs_nbfree;
                sblock.fs_old_cstotal.cs_nifree = sblock.fs_cstotal.cs_nifree;
                sblock.fs_old_cstotal.cs_nffree = sblock.fs_cstotal.cs_nffree;
        }
        /*
         * Write out the super-block and zeros until the first cg info
         */
        i = cgsblock(&sblock, 0) * sblock.fs_fsize - sblock.fs_sblockloc,
        memset(iobuf, 0, i);
        memcpy(iobuf, &sblock, sizeof sblock);
        if (needswap)
                ffs_sb_swap(&sblock, (struct fs *)iobuf);
        if ((sblock.fs_old_flags & FS_FLAGS_UPDATED) == 0)
                memset(iobuf + offsetof(struct fs, fs_old_postbl_start),
                    0xff, 256);
        wtfs(sblock.fs_sblockloc / sectorsize, i, iobuf);

        /* Write out first and last cylinder summary sectors */
        if (needswap)
                ffs_csum_swap(fscs_0, fscs_0, sblock.fs_fsize);
        wtfs(fsbtodb(&sblock, sblock.fs_csaddr), sblock.fs_fsize, fscs_0);

        if (fscs_next > fscs_reset) {
                if (needswap)
                        ffs_csum_swap(fscs_reset, fscs_reset, sblock.fs_fsize);
                fs_csaddr++;
                wtfs(fsbtodb(&sblock, fs_csaddr), sblock.fs_fsize, fscs_reset);
        }

        /* mfs doesn't need these permanently allocated */
        munmap(iobuf, iobuf_memsize);
        munmap(fscs_0, 2 * sblock.fs_fsize);
}

/*
 * Initialize a cylinder group.
 */
void
initcg(int cylno, const struct timeval *tv)
{
        daddr_t cbase, dmax;
        int32_t i, d, dlower, dupper, blkno;
        uint32_t u;
        struct ufs1_dinode *dp1;
        struct ufs2_dinode *dp2;
        int start;

        /*
         * Determine block bounds for cylinder group.
         * Allow space for super block summary information in first
         * cylinder group.
         */
        cbase = cgbase(&sblock, cylno);
        dmax = cbase + sblock.fs_fpg;
        if (dmax > sblock.fs_size)
                dmax = sblock.fs_size;
        dlower = cgsblock(&sblock, cylno) - cbase;
        dupper = cgdmin(&sblock, cylno) - cbase;
        if (cylno == 0) {
                dupper += howmany(sblock.fs_cssize, sblock.fs_fsize);
                if (dupper >= cgstart(&sblock, cylno + 1)) {
                        printf("\rToo many cylinder groups to fit summary "
                                "information into first cylinder group\n");
                        exit(40);
                }
        }
        memset(&acg, 0, sblock.fs_cgsize);
        acg.cg_magic = CG_MAGIC;
        acg.cg_cgx = cylno;
        acg.cg_ndblk = dmax - cbase;
        if (sblock.fs_contigsumsize > 0)
                acg.cg_nclusterblks = acg.cg_ndblk >> sblock.fs_fragshift;
        start = &acg.cg_space[0] - (u_char *)(&acg.cg_firstfield);
        if (Oflag == 2) {
                acg.cg_time = tv->tv_sec;
                acg.cg_niblk = sblock.fs_ipg;
                acg.cg_initediblk = sblock.fs_ipg < 2 * INOPB(&sblock) ?
                    sblock.fs_ipg : 2 * INOPB(&sblock);
                acg.cg_iusedoff = start;
        } else {
                acg.cg_old_ncyl = sblock.fs_old_cpg;
                if ((sblock.fs_old_flags & FS_FLAGS_UPDATED) == 0 &&
                    (cylno == sblock.fs_ncg - 1))
                        acg.cg_old_ncyl = 
                            sblock.fs_old_ncyl % sblock.fs_old_cpg;
                acg.cg_old_time = tv->tv_sec;
                acg.cg_old_niblk = sblock.fs_ipg;
                acg.cg_old_btotoff = start;
                acg.cg_old_boff = acg.cg_old_btotoff +
                    sblock.fs_old_cpg * sizeof(int32_t);
                acg.cg_iusedoff = acg.cg_old_boff +
                    sblock.fs_old_cpg * sizeof(u_int16_t);
        }
        acg.cg_freeoff = acg.cg_iusedoff + howmany(sblock.fs_ipg, CHAR_BIT);
        if (sblock.fs_contigsumsize <= 0) {
                acg.cg_nextfreeoff = acg.cg_freeoff +
                   howmany(sblock.fs_fpg, CHAR_BIT);
        } else {
                acg.cg_clustersumoff = acg.cg_freeoff +
                    howmany(sblock.fs_fpg, CHAR_BIT) - sizeof(int32_t);
                if (isappleufs) {
                        /* Apple PR2216969 gives rationale for this change.
                         * I believe they were mistaken, but we need to
                         * duplicate it for compatibility.  -- dbj@NetBSD.org
                         */
                        acg.cg_clustersumoff += sizeof(int32_t);
                }
                acg.cg_clustersumoff =
                    roundup(acg.cg_clustersumoff, sizeof(int32_t));
                acg.cg_clusteroff = acg.cg_clustersumoff +
                    (sblock.fs_contigsumsize + 1) * sizeof(int32_t);
                acg.cg_nextfreeoff = acg.cg_clusteroff +
                    howmany(fragstoblks(&sblock, sblock.fs_fpg), CHAR_BIT);
        }
        if (acg.cg_nextfreeoff > sblock.fs_cgsize) {
                printf("Panic: cylinder group too big\n");
                exit(37);
        }
        acg.cg_cs.cs_nifree += sblock.fs_ipg;
        if (cylno == 0)
                for (u = 0; u < ROOTINO; u++) {
                        setbit(cg_inosused(&acg, 0), u);
                        acg.cg_cs.cs_nifree--;
                }
        if (cylno > 0) {
                /*
                 * In cylno 0, beginning space is reserved
                 * for boot and super blocks.
                 */
                for (d = 0, blkno = 0; d < dlower;) {
                        setblock(&sblock, cg_blksfree(&acg, 0), blkno);
                        if (sblock.fs_contigsumsize > 0)
                                setbit(cg_clustersfree(&acg, 0), blkno);
                        acg.cg_cs.cs_nbfree++;
                        if (Oflag <= 1) {
                                int cn = old_cbtocylno(&sblock, d);
                                old_cg_blktot(&acg, 0)[cn]++;
                                old_cg_blks(&sblock, &acg,
                                    cn, 0)[old_cbtorpos(&sblock, d)]++;
                        }
                        d += sblock.fs_frag;
                        blkno++;
                }
        }
        if ((i = (dupper & (sblock.fs_frag - 1))) != 0) {
                acg.cg_frsum[sblock.fs_frag - i]++;
                for (d = dupper + sblock.fs_frag - i; dupper < d; dupper++) {
                        setbit(cg_blksfree(&acg, 0), dupper);
                        acg.cg_cs.cs_nffree++;
                }
        }
        for (d = dupper, blkno = dupper >> sblock.fs_fragshift;
             d + sblock.fs_frag <= acg.cg_ndblk; ) {
                setblock(&sblock, cg_blksfree(&acg, 0), blkno);
                if (sblock.fs_contigsumsize > 0)
                        setbit(cg_clustersfree(&acg, 0), blkno);
                acg.cg_cs.cs_nbfree++;
                if (Oflag <= 1) {
                        int cn = old_cbtocylno(&sblock, d);
                        old_cg_blktot(&acg, 0)[cn]++;
                        old_cg_blks(&sblock, &acg,
                            cn, 0)[old_cbtorpos(&sblock, d)]++;
                }
                d += sblock.fs_frag;
                blkno++;
        }
        if (d < acg.cg_ndblk) {
                acg.cg_frsum[acg.cg_ndblk - d]++;
                for (; d < acg.cg_ndblk; d++) {
                        setbit(cg_blksfree(&acg, 0), d);
                        acg.cg_cs.cs_nffree++;
                }
        }
        if (sblock.fs_contigsumsize > 0) {
                int32_t *sump = cg_clustersum(&acg, 0);
                u_char *mapp = cg_clustersfree(&acg, 0);
                int map = *mapp++;
                int bit = 1;
                int run = 0;

                for (i = 0; i < acg.cg_nclusterblks; i++) {
                        if ((map & bit) != 0) {
                                run++;
                        } else if (run != 0) {
                                if (run > sblock.fs_contigsumsize)
                                        run = sblock.fs_contigsumsize;
                                sump[run]++;
                                run = 0;
                        }
                        if ((i & (CHAR_BIT - 1)) != (CHAR_BIT - 1)) {
                                bit <<= 1;
                        } else {
                                map = *mapp++;
                                bit = 1;
                        }
                }
                if (run != 0) {
                        if (run > sblock.fs_contigsumsize)
                                run = sblock.fs_contigsumsize;
                        sump[run]++;
                }
        }
        *fscs_next++ = acg.cg_cs;
        if (fscs_next == fscs_end) {
                /* write block of cylinder group summary info into cyl 0 */
                if (needswap)
                        ffs_csum_swap(fscs_reset, fscs_reset, sblock.fs_fsize);
                fs_csaddr++;
                wtfs(fsbtodb(&sblock, fs_csaddr), sblock.fs_fsize, fscs_reset);
                fscs_next = fscs_reset;
                memset(fscs_next, 0, sblock.fs_fsize);
        }
        /*
         * Write out the duplicate super block, the cylinder group map
         * and two blocks worth of inodes in a single write.
         */
        start = sblock.fs_bsize > SBLOCKSIZE ? sblock.fs_bsize : SBLOCKSIZE;
        memcpy(&iobuf[start], &acg, sblock.fs_cgsize);
        if (needswap)
                ffs_cg_swap(&acg, (struct cg*)&iobuf[start], &sblock);
        start += sblock.fs_bsize;
        dp1 = (struct ufs1_dinode *)(&iobuf[start]);
        dp2 = (struct ufs2_dinode *)(&iobuf[start]);
        for (i = MIN(sblock.fs_ipg, 2) * INOPB(&sblock); i != 0; i--) {
                if (sblock.fs_magic == FS_UFS1_MAGIC) {
                        /* No need to swap, it'll stay random */
                        dp1->di_gen = arc4random() & INT32_MAX;
                        dp1++;
                } else {
                        dp2->di_gen = arc4random() & INT32_MAX;
                        dp2++;
                }
        }
        wtfs(fsbtodb(&sblock, cgsblock(&sblock, cylno)), iobufsize, iobuf);
        /*
         * For the old file system, we have to initialize all the inodes.
         */
        if (sblock.fs_magic != FS_UFS1_MAGIC)
                return;

        /* Write 'd' (usually 16 * fs_frag) file-system fragments at once */
        d = (iobuf_memsize - start) / sblock.fs_bsize * sblock.fs_frag;
        dupper = sblock.fs_ipg / INOPF(&sblock);
        for (i = 2 * sblock.fs_frag; i < dupper; i += d) {
                if (d > dupper - i)
                        d = dupper - i;
                dp1 = (struct ufs1_dinode *)(&iobuf[start]);
                do
                        dp1->di_gen = arc4random() & INT32_MAX;
                while ((char *)++dp1 < &iobuf[iobuf_memsize]);
                wtfs(fsbtodb(&sblock, cgimin(&sblock, cylno) + i),
                    d * sblock.fs_bsize / sblock.fs_frag, &iobuf[start]);
        }
}

/*
 * initialize the file system
 */

#ifdef LOSTDIR
#define PREDEFDIR 3
#else
#define PREDEFDIR 2
#endif

struct direct root_dir[] = {
        { ROOTINO, sizeof(struct direct), DT_DIR, 1, "." },
        { ROOTINO, sizeof(struct direct), DT_DIR, 2, ".." },
#ifdef LOSTDIR
        { LOSTFOUNDINO, sizeof(struct direct), DT_DIR, 10, "lost+found" },
#endif
};
struct odirect {
        u_int32_t d_ino;
        u_int16_t d_reclen;
        u_int16_t d_namlen;
        u_char  d_name[FFS_MAXNAMLEN + 1];
} oroot_dir[] = {
        { ROOTINO, sizeof(struct direct), 1, "." },
        { ROOTINO, sizeof(struct direct), 2, ".." },
#ifdef LOSTDIR
        { LOSTFOUNDINO, sizeof(struct direct), 10, "lost+found" },
#endif
};
#ifdef LOSTDIR
struct direct lost_found_dir[] = {
        { LOSTFOUNDINO, sizeof(struct direct), DT_DIR, 1, "." },
        { ROOTINO, sizeof(struct direct), DT_DIR, 2, ".." },
        { 0, DIRBLKSIZ, 0, 0, 0 },
};
struct odirect olost_found_dir[] = {
        { LOSTFOUNDINO, sizeof(struct direct), 1, "." },
        { ROOTINO, sizeof(struct direct), 2, ".." },
        { 0, DIRBLKSIZ, 0, 0 },
};
#endif
char buf[MAXBSIZE];
static void copy_dir(struct direct *, struct direct *);

int
fsinit(const struct timeval *tv, mode_t mfsmode, uid_t mfsuid, gid_t mfsgid)
{
        union dinode node;
#ifdef LOSTDIR
        int i;
        int dirblksiz = DIRBLKSIZ;
        if (isappleufs)
                dirblksiz = APPLEUFS_DIRBLKSIZ;
#endif

        /*
         * initialize the node
         */

#ifdef LOSTDIR
        /*
         * create the lost+found directory
         */
        memset(&node, 0, sizeof(node));
        if (Oflag == 0) {
                (void)makedir((struct direct *)olost_found_dir, 2);
                for (i = dirblksiz; i < sblock.fs_bsize; i += dirblksiz)
                        copy_dir((struct direct*)&olost_found_dir[2],
                                (struct direct*)&buf[i]);
        } else {
                (void)makedir(lost_found_dir, 2);
                for (i = dirblksiz; i < sblock.fs_bsize; i += dirblksiz)
                        copy_dir(&lost_found_dir[2], (struct direct*)&buf[i]);
        }
        if (sblock.fs_magic == FS_UFS1_MAGIC) {
                node.dp1.di_atime = tv->tv_sec;
                node.dp1.di_atimensec = tv->tv_usec * 1000;
                node.dp1.di_mtime = tv->tv_sec;
                node.dp1.di_mtimensec = tv->tv_usec * 1000;
                node.dp1.di_ctime = tv->tv_sec;
                node.dp1.di_ctimensec = tv->tv_usec * 1000;
                node.dp1.di_mode = IFDIR | UMASK;
                node.dp1.di_nlink = 2;
                node.dp1.di_size = sblock.fs_bsize;
                node.dp1.di_db[0] = alloc(node.dp1.di_size, node.dp1.di_mode);
                if (node.dp1.di_db[0] == 0)
                        return (0);
                node.dp1.di_blocks = btodb(fragroundup(&sblock,
                    node.dp1.di_size));
                node.dp1.di_uid = geteuid();
                node.dp1.di_gid = getegid();
                wtfs(fsbtodb(&sblock, node.dp1.di_db[0]), node.dp1.di_size,
                    buf);
        } else {
                node.dp2.di_atime = tv->tv_sec;
                node.dp2.di_atimensec = tv->tv_usec * 1000;
                node.dp2.di_mtime = tv->tv_sec;
                node.dp2.di_mtimensec = tv->tv_usec * 1000;
                node.dp2.di_ctime = tv->tv_sec;
                node.dp2.di_ctimensec = tv->tv_usec * 1000;
                node.dp2.di_birthtime = tv->tv_sec;
                node.dp2.di_birthnsec = tv->tv_usec * 1000;
                node.dp2.di_mode = IFDIR | UMASK;
                node.dp2.di_nlink = 2;
                node.dp2.di_size = sblock.fs_bsize;
                node.dp2.di_db[0] = alloc(node.dp2.di_size, node.dp2.di_mode);
                if (node.dp2.di_db[0] == 0)
                        return (0);
                node.dp2.di_blocks = btodb(fragroundup(&sblock,
                    node.dp2.di_size));
                node.dp2.di_uid = geteuid();
                node.dp2.di_gid = getegid();
                wtfs(fsbtodb(&sblock, node.dp2.di_db[0]), node.dp2.di_size,
                    buf);
        }
        iput(&node, LOSTFOUNDINO);
#endif
        /*
         * create the root directory
         */
        memset(&node, 0, sizeof(node));
        if (Oflag <= 1) {
                if (mfs) {
                        node.dp1.di_mode = IFDIR | mfsmode;
                        node.dp1.di_uid = mfsuid;
                        node.dp1.di_gid = mfsgid;
                } else {
                        node.dp1.di_mode = IFDIR | UMASK;
                        node.dp1.di_uid = geteuid();
                        node.dp1.di_gid = getegid();
                }
                node.dp1.di_nlink = PREDEFDIR;
                if (Oflag == 0)
                        node.dp1.di_size = makedir((struct direct *)oroot_dir,
                            PREDEFDIR);
                else
                        node.dp1.di_size = makedir(root_dir, PREDEFDIR);
                node.dp1.di_db[0] = alloc(sblock.fs_fsize, node.dp1.di_mode);
                if (node.dp1.di_db[0] == 0)
                        return (0);
                node.dp1.di_blocks = btodb(fragroundup(&sblock,
                    node.dp1.di_size));
                wtfs(fsbtodb(&sblock, node.dp1.di_db[0]), sblock.fs_fsize, buf);
        } else {
                if (mfs) {
                        node.dp2.di_mode = IFDIR | mfsmode;
                        node.dp2.di_uid = mfsuid;
                        node.dp2.di_gid = mfsgid;
                } else {
                        node.dp2.di_mode = IFDIR | UMASK;
                        node.dp2.di_uid = geteuid();
                        node.dp2.di_gid = getegid();
                }
                node.dp2.di_atime = tv->tv_sec;
                node.dp2.di_atimensec = tv->tv_usec * 1000;
                node.dp2.di_mtime = tv->tv_sec;
                node.dp2.di_mtimensec = tv->tv_usec * 1000;
                node.dp2.di_ctime = tv->tv_sec;
                node.dp2.di_ctimensec = tv->tv_usec * 1000;
                node.dp2.di_birthtime = tv->tv_sec;
                node.dp2.di_birthnsec = tv->tv_usec * 1000;
                node.dp2.di_nlink = PREDEFDIR;
                node.dp2.di_size = makedir(root_dir, PREDEFDIR);
                node.dp2.di_db[0] = alloc(sblock.fs_fsize, node.dp2.di_mode);
                if (node.dp2.di_db[0] == 0)
                        return (0);
                node.dp2.di_blocks = btodb(fragroundup(&sblock,
                    node.dp2.di_size));
                wtfs(fsbtodb(&sblock, node.dp2.di_db[0]), sblock.fs_fsize, buf);
        }
        iput(&node, ROOTINO);
        return (1);
}

/*
 * construct a set of directory entries in "buf".
 * return size of directory.
 */
int
makedir(struct direct *protodir, int entries)
{
        char *cp;
        int i, spcleft;
        int dirblksiz = DIRBLKSIZ;
        if (isappleufs)
                dirblksiz = APPLEUFS_DIRBLKSIZ;

        memset(buf, 0, DIRBLKSIZ);
        spcleft = dirblksiz;
        for (cp = buf, i = 0; i < entries - 1; i++) {
                protodir[i].d_reclen = DIRSIZ(Oflag == 0, &protodir[i], 0);
                copy_dir(&protodir[i], (struct direct*)cp);
                cp += protodir[i].d_reclen;
                spcleft -= protodir[i].d_reclen;
        }
        protodir[i].d_reclen = spcleft;
        copy_dir(&protodir[i], (struct direct*)cp);
        return (dirblksiz);
}

/*
 * allocate a block or frag
 */
daddr_t
alloc(int size, int mode)
{
        int i, frag;
        daddr_t d, blkno;

        rdfs(fsbtodb(&sblock, cgtod(&sblock, 0)), sblock.fs_cgsize, &acg);
        /* fs -> host byte order */
        if (needswap)
                ffs_cg_swap(&acg, &acg, &sblock);
        if (acg.cg_magic != CG_MAGIC) {
                printf("cg 0: bad magic number\n");
                return (0);
        }
        if (acg.cg_cs.cs_nbfree == 0) {
                printf("first cylinder group ran out of space\n");
                return (0);
        }
        for (d = 0; d < acg.cg_ndblk; d += sblock.fs_frag)
                if (isblock(&sblock, cg_blksfree(&acg, 0),
                    d >> sblock.fs_fragshift))
                        goto goth;
        printf("internal error: can't find block in cyl 0\n");
        return (0);
goth:
        blkno = fragstoblks(&sblock, d);
        clrblock(&sblock, cg_blksfree(&acg, 0), blkno);
        if (sblock.fs_contigsumsize > 0)
                clrbit(cg_clustersfree(&acg, 0), blkno);
        acg.cg_cs.cs_nbfree--;
        sblock.fs_cstotal.cs_nbfree--;
        fscs_0->cs_nbfree--;
        if (mode & IFDIR) {
                acg.cg_cs.cs_ndir++;
                sblock.fs_cstotal.cs_ndir++;
                fscs_0->cs_ndir++;
        }
        if (Oflag <= 1) {
                int cn = old_cbtocylno(&sblock, d);
                old_cg_blktot(&acg, 0)[cn]--;
                old_cg_blks(&sblock, &acg,
                    cn, 0)[old_cbtorpos(&sblock, d)]--;
        }
        if (size != sblock.fs_bsize) {
                frag = howmany(size, sblock.fs_fsize);
                fscs_0->cs_nffree += sblock.fs_frag - frag;
                sblock.fs_cstotal.cs_nffree += sblock.fs_frag - frag;
                acg.cg_cs.cs_nffree += sblock.fs_frag - frag;
                acg.cg_frsum[sblock.fs_frag - frag]++;
                for (i = frag; i < sblock.fs_frag; i++)
                        setbit(cg_blksfree(&acg, 0), d + i);
        }
        /* host -> fs byte order */
        if (needswap)
                ffs_cg_swap(&acg, &acg, &sblock);
        wtfs(fsbtodb(&sblock, cgtod(&sblock, 0)), sblock.fs_cgsize, &acg);
        return (d);
}

/*
 * Allocate an inode on the disk
 */
static void
iput(union dinode *ip, ino_t ino)
{
        daddr_t d;
        int c, i;
        struct ufs1_dinode *dp1;
        struct ufs2_dinode *dp2;

        c = ino_to_cg(&sblock, ino);
        rdfs(fsbtodb(&sblock, cgtod(&sblock, 0)), sblock.fs_cgsize, &acg);
        /* fs -> host byte order */
        if (needswap)
                ffs_cg_swap(&acg, &acg, &sblock);
        if (acg.cg_magic != CG_MAGIC) {
                printf("cg 0: bad magic number\n");
                exit(31);
        }
        acg.cg_cs.cs_nifree--;
        setbit(cg_inosused(&acg, 0), ino);
        /* host -> fs byte order */
        if (needswap)
                ffs_cg_swap(&acg, &acg, &sblock);
        wtfs(fsbtodb(&sblock, cgtod(&sblock, 0)), sblock.fs_cgsize, &acg);
        sblock.fs_cstotal.cs_nifree--;
        fscs_0->cs_nifree--;
        if (ino >= (ino_t)(sblock.fs_ipg * sblock.fs_ncg)) {
                printf("fsinit: inode value out of range (%llu).\n",
                    (unsigned long long)ino);
                exit(32);
        }
        d = fsbtodb(&sblock, ino_to_fsba(&sblock, ino));
        rdfs(d, sblock.fs_bsize, (char *)iobuf);
        if (sblock.fs_magic == FS_UFS1_MAGIC) {
                dp1 = (struct ufs1_dinode *)iobuf;
                dp1 += ino_to_fsbo(&sblock, ino);
                if (needswap) {
                        ffs_dinode1_swap(&ip->dp1, dp1);
                        /* ffs_dinode1_swap() doesn't swap blocks addrs */
                        for (i=0; i<NDADDR + NIADDR; i++)
                            dp1->di_db[i] = bswap32(ip->dp1.di_db[i]);
                } else
                        *dp1 = ip->dp1;
                dp1->di_gen = arc4random() & INT32_MAX;
        } else {
                dp2 = (struct ufs2_dinode *)iobuf;
                dp2 += ino_to_fsbo(&sblock, ino);
                if (needswap) {
                        ffs_dinode2_swap(&ip->dp2, dp2);
                        for (i=0; i<NDADDR + NIADDR; i++)
                            dp2->di_db[i] = bswap64(ip->dp2.di_db[i]);
                } else
                        *dp2 = ip->dp2;
                dp2->di_gen = arc4random() & INT32_MAX;
        }
        wtfs(d, sblock.fs_bsize, iobuf);
}

/*
 * read a block from the file system
 */
void
rdfs(daddr_t bno, int size, void *bf)
{
        int n;
        off_t offset;

#ifdef MFS
        if (mfs) {
                if (Nflag)
                        memset(bf, 0, size);
                else
                        memmove(bf, membase + bno * sectorsize, size);
                return;
        }
#endif
        offset = bno;
        n = pread(fsi, bf, size, offset * sectorsize);
        if (n != size) {
                printf("rdfs: read error for sector %lld: %s\n",
                    (long long)bno, strerror(errno));
                exit(34);
        }
}

/*
 * write a block to the file system
 */
void
wtfs(daddr_t bno, int size, void *bf)
{
        int n;
        off_t offset;

        if (Nflag)
                return;
#ifdef MFS
        if (mfs) {
                memmove(membase + bno * sectorsize, bf, size);
                return;
        }
#endif
        offset = bno;
        n = pwrite(fso, bf, size, offset * sectorsize);
        if (n != size) {
                printf("wtfs: write error for sector %lld: %s\n",
                    (long long)bno, strerror(errno));
                exit(36);
        }
}

/*
 * check if a block is available
 */
int
isblock(struct fs *fs, unsigned char *cp, int h)
{
        unsigned char mask;

        switch (fs->fs_fragshift) {
        case 3:
                return (cp[h] == 0xff);
        case 2:
                mask = 0x0f << ((h & 0x1) << 2);
                return ((cp[h >> 1] & mask) == mask);
        case 1:
                mask = 0x03 << ((h & 0x3) << 1);
                return ((cp[h >> 2] & mask) == mask);
        case 0:
                mask = 0x01 << (h & 0x7);
                return ((cp[h >> 3] & mask) == mask);
        default:
#ifdef STANDALONE
                printf("isblock bad fs_fragshift %d\n", fs->fs_fragshift);
#else
                fprintf(stderr, "isblock bad fs_fragshift %d\n",
                    fs->fs_fragshift);
#endif
                return (0);
        }
}

/*
 * take a block out of the map
 */
void
clrblock(struct fs *fs, unsigned char *cp, int h)
{
        switch ((fs)->fs_fragshift) {
        case 3:
                cp[h] = 0;
                return;
        case 2:
                cp[h >> 1] &= ~(0x0f << ((h & 0x1) << 2));
                return;
        case 1:
                cp[h >> 2] &= ~(0x03 << ((h & 0x3) << 1));
                return;
        case 0:
                cp[h >> 3] &= ~(0x01 << (h & 0x7));
                return;
        default:
#ifdef STANDALONE
                printf("clrblock bad fs_fragshift %d\n", fs->fs_fragshift);
#else
                fprintf(stderr, "clrblock bad fs_fragshift %d\n",
                    fs->fs_fragshift);
#endif
                return;
        }
}

/*
 * put a block into the map
 */
void
setblock(struct fs *fs, unsigned char *cp, int h)
{
        switch (fs->fs_fragshift) {
        case 3:
                cp[h] = 0xff;
                return;
        case 2:
                cp[h >> 1] |= (0x0f << ((h & 0x1) << 2));
                return;
        case 1:
                cp[h >> 2] |= (0x03 << ((h & 0x3) << 1));
                return;
        case 0:
                cp[h >> 3] |= (0x01 << (h & 0x7));
                return;
        default:
#ifdef STANDALONE
                printf("setblock bad fs_frag %d\n", fs->fs_fragshift);
#else
                fprintf(stderr, "setblock bad fs_fragshift %d\n",
                    fs->fs_fragshift);
#endif
                return;
        }
}

/* copy a direntry to a buffer, in fs byte order */
static void
copy_dir(struct direct *dir, struct direct *dbuf)
{
        memcpy(dbuf, dir, DIRSIZ(Oflag == 0, dir, 0));
        if (needswap) {
                dbuf->d_ino = bswap32(dir->d_ino);
                dbuf->d_reclen = bswap16(dir->d_reclen);
                if (Oflag == 0)
                        ((struct odirect*)dbuf)->d_namlen =
                                bswap16(((struct odirect*)dir)->d_namlen);
        }
}

static int
ilog2(int val)
{
        u_int n;

        for (n = 0; n < sizeof(n) * CHAR_BIT; n++)
                if (1 << n == val)
                        return (n);
        errx(1, "ilog2: %d is not a power of 2\n", val);
}

static void
zap_old_sblock(int sblkoff)
{
        static int cg0_data;
        uint32_t oldfs[SBLOCKSIZE / 4];
        static const struct fsm {
                uint32_t        offset;
                uint32_t        magic;
                uint32_t        mask;
        } fs_magics[] = {
                {offsetof(struct fs, fs_magic)/4, FS_UFS1_MAGIC, ~0u},
                {offsetof(struct fs, fs_magic)/4, FS_UFS2_MAGIC, ~0u},
                {0, 0x70162, ~0u},              /* LFS_MAGIC */
                {14, 0xef53, 0xffff},           /* EXT2FS (little) */
                {14, 0xef530000, 0xffff0000},   /* EXT2FS (big) */
                {.offset = ~0u},
        };
        const struct fsm *fsm;

        if (Nflag)
                return;

        if (sblkoff == 0)       /* Why did UFS2 add support for this?  sigh. */
                return;

        if (cg0_data == 0)
                /* For FFSv1 this could include all the inodes. */
                cg0_data = cgsblock(&sblock, 0) * sblock.fs_fsize + iobufsize;

        /* Ignore anything that is beyond our filesystem */
        if ((sblkoff + SBLOCKSIZE)/sectorsize >= fssize)
                return;
        /* Zero anything inside our filesystem... */
        if (sblkoff >= sblock.fs_sblockloc) {
                /* ...unless we will write that area anyway */
                if (sblkoff >= cg0_data)
                        wtfs(sblkoff / sectorsize,
                            roundup(sizeof sblock, sectorsize), iobuf);
                return;
        }

        /* The sector might contain boot code, so we must validate it */
        rdfs(sblkoff/sectorsize, sizeof oldfs, &oldfs);
        for (fsm = fs_magics; ; fsm++) {
                uint32_t v;
                if (fsm->mask == 0)
                        return;
                v = oldfs[fsm->offset];
                if ((v & fsm->mask) == fsm->magic ||
                    (bswap32(v) & fsm->mask) == fsm->magic)
                        break;
        }

        /* Just zap the magic number */
        oldfs[fsm->offset] = 0;
        wtfs(sblkoff/sectorsize, sizeof oldfs, &oldfs);
}


#ifdef MFS
/*
 * XXX!
 * Attempt to guess how much more space is available for process data.  The
 * heuristic we use is
 *
 *      max_data_limit - (sbrk(0) - etext) - 128kB
 *
 * etext approximates that start address of the data segment, and the 128kB
 * allows some slop for both segment gap between text and data, and for other
 * (libc) malloc usage.
 */
static void
calc_memfree(void)
{
        extern char etext;
        struct rlimit rlp;
        u_long base;

        base = (u_long)sbrk(0) - (u_long)&etext;
        if (getrlimit(RLIMIT_DATA, &rlp) < 0)
                perror("getrlimit");
        rlp.rlim_cur = rlp.rlim_max;
        if (setrlimit(RLIMIT_DATA, &rlp) < 0)
                perror("setrlimit");
        memleft = rlp.rlim_max - base - (128 * 1024);
}

/*
 * Internal version of malloc that trims the requested size if not enough
 * memory is available.
 */
static void *
mkfs_malloc(size_t size)
{
        u_long pgsz;
        caddr_t *memory;

        if (size == 0)
                return (NULL);
        if (memleft == 0)
                calc_memfree();

        pgsz = getpagesize() - 1;
        size = (size + pgsz) &~ pgsz;
        if (size > memleft)
                size = memleft;
        memleft -= size;
        memory = mmap(0, size, PROT_READ|PROT_WRITE, MAP_ANON|MAP_PRIVATE,
            -1, 0);
        return memory != MAP_FAILED ? memory : NULL;
}
#endif  /* MFS */