source: MondoRescue/branches/2.2.5/mindi-busybox/e2fsprogs/old_e2fsprogs/mke2fs.c@ 1765

/* vi: set sw=4 ts=4: */
/*
 * mke2fs.c - Make a ext2fs filesystem.
 *
 * Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002,
 *  2003, 2004, 2005 by Theodore Ts'o.
 *
 * This file may be redistributed under the terms of the GNU Public
 * License.
 */

/* Usage: mke2fs [options] device
 *
 * The device may be a block device or a image of one, but this isn't
 * enforced (but it's not much fun on a character device :-).
 */

#include <stdio.h>
#include <string.h>
#include <fcntl.h>
#include <ctype.h>
#include <time.h>
#include <getopt.h>
#include <unistd.h>
#include <stdlib.h>
#include <errno.h>
#include <mntent.h>
#include <sys/ioctl.h>
#include <sys/types.h>

#include "e2fsbb.h"
#include "ext2fs/ext2_fs.h"
#include "uuid/uuid.h"
#include "e2p/e2p.h"
#include "ext2fs/ext2fs.h"
#include "util.h"

#define STRIDE_LENGTH 8

#ifndef __sparc__
#define ZAP_BOOTBLOCK
#endif

static const char * device_name;

/* Command line options */
static int  cflag;
static int  quiet;
static int  super_only;
static int  force;
static int  noaction;
static int  journal_size;
static int  journal_flags;
static const char *bad_blocks_filename;
static __u32    fs_stride;

static struct ext2_super_block param;
static char *creator_os;
static char *volume_label;
static char *mount_dir;
static char *journal_device = NULL;
static int   sync_kludge; /* Set using the MKE2FS_SYNC env. option */

static int sys_page_size = 4096;
static int linux_version_code = 0;

static int int_log2(int arg)
{
    int l = 0;

    arg >>= 1;
    while (arg) {
        l++;
        arg >>= 1;
    }
    return l;
}

static int int_log10(unsigned int arg)
{
    int l;

    for (l = 0; arg; l++)
        arg = arg / 10;
    return l;
}

/*
 * This function sets the default parameters for a filesystem
 *
 * The type is specified by the user.  The size is the maximum size
 * (in megabytes) for which a set of parameters applies, with a size
 * of zero meaning that it is the default parameter for the type.
 * Note that order is important in the table below.
 */
#define DEF_MAX_BLOCKSIZE -1
static const char default_str[] = "default";
struct mke2fs_defaults {
    const char  *type;
    int     size;
    int     blocksize;
    int     inode_ratio;
};

static const struct mke2fs_defaults settings[] = {
    { default_str,   0, 4096, 8192 },
    { default_str, 512, 1024, 4096 },
    { default_str,   3, 1024, 8192 },
    { "journal",     0, 4096, 8192 },
    { "news",    0, 4096, 4096 },
    { "largefile",   0, 4096, 1024 * 1024 },
    { "largefile4",  0, 4096, 4096 * 1024 },
    { 0,         0,    0, 0},
};

static void set_fs_defaults(const char *fs_type,
                struct ext2_super_block *super,
                int blocksize, int sector_size,
                int *inode_ratio)
{
    int megs;
    int ratio = 0;
    const struct mke2fs_defaults *p;
    int use_bsize = 1024;

    megs = super->s_blocks_count * (EXT2_BLOCK_SIZE(super) / 1024) / 1024;
    if (inode_ratio)
        ratio = *inode_ratio;
    if (!fs_type)
        fs_type = default_str;
    for (p = settings; p->type; p++) {
        if ((strcmp(p->type, fs_type) != 0) &&
            (strcmp(p->type, default_str) != 0))
            continue;
        if ((p->size != 0) && (megs > p->size))
            continue;
        if (ratio == 0)
            *inode_ratio = p->inode_ratio < blocksize ?
                blocksize : p->inode_ratio;
        use_bsize = p->blocksize;
    }
    if (blocksize <= 0) {
        if (use_bsize == DEF_MAX_BLOCKSIZE) {
            use_bsize = sys_page_size;
            if ((linux_version_code < (2*65536 + 6*256)) &&
                (use_bsize > 4096))
                use_bsize = 4096;
        }
        if (sector_size && use_bsize < sector_size)
            use_bsize = sector_size;
        if ((blocksize < 0) && (use_bsize < (-blocksize)))
            use_bsize = -blocksize;
        blocksize = use_bsize;
        super->s_blocks_count /= blocksize / 1024;
    }
    super->s_log_frag_size = super->s_log_block_size =
        int_log2(blocksize >> EXT2_MIN_BLOCK_LOG_SIZE);
}


/*
 * Helper function for read_bb_file and test_disk
 */
static void invalid_block(ext2_filsys fs EXT2FS_ATTR((unused)), blk_t blk)
{
    bb_error_msg("Bad block %u out of range; ignored", blk);
}

/*
 * Busybox stuff
 */
static void mke2fs_error_msg_and_die(int retval, const char *fmt, ...) __attribute__ ((format (printf, 2, 3)));
static void mke2fs_error_msg_and_die(int retval, const char *fmt, ...)
{
    va_list ap;

    if (retval) {
        va_start(ap, fmt);
        fprintf(stderr,"\nCould not ");
        vfprintf(stderr, fmt, ap);
        fprintf(stderr, "\n");
        va_end(ap);
        exit(EXIT_FAILURE);
    }
}

static void mke2fs_verbose(const char *fmt, ...) __attribute__ ((format (printf, 1, 2)));
static void mke2fs_verbose(const char *fmt, ...)
{
    va_list ap;

    if (!quiet) {
        va_start(ap, fmt);
        vfprintf(stdout, fmt, ap);
        fflush(stdout);
        va_end(ap);
    }
}

static void mke2fs_verbose_done(void)
{
    mke2fs_verbose("done\n");
}

static void mke2fs_warning_msg(int retval, char *fmt, ... ) __attribute__ ((format (printf, 2, 3)));
static void mke2fs_warning_msg(int retval, char *fmt, ... )
{
    va_list ap;

    if (retval) {
        va_start(ap, fmt);
        fprintf(stderr,"\nWarning: ");
        vfprintf(stderr, fmt, ap);
        fprintf(stderr, "\n");
        va_end(ap);
    }
}

/*
 * Reads the bad blocks list from a file
 */
static void read_bb_file(ext2_filsys fs, badblocks_list *bb_list,
             const char *bad_blocks_file)
{
    FILE        *f;
    errcode_t   retval;

    f = xfopen(bad_blocks_file, "r");
    retval = ext2fs_read_bb_FILE(fs, f, bb_list, invalid_block);
    fclose (f);
    mke2fs_error_msg_and_die(retval, "read bad blocks from list");
}

/*
 * Runs the badblocks program to test the disk
 */
static void test_disk(ext2_filsys fs, badblocks_list *bb_list)
{
    FILE        *f;
    errcode_t   retval;
    char        buf[1024];

    sprintf(buf, "badblocks -b %d %s%s%s %d", fs->blocksize,
        quiet ? "" : "-s ", (cflag > 1) ? "-w " : "",
        fs->device_name, fs->super->s_blocks_count);
    mke2fs_verbose("Running command: %s\n", buf);
    f = popen(buf, "r");
    if (!f) {
        bb_perror_msg_and_die("cannot run '%s'", buf);
    }
    retval = ext2fs_read_bb_FILE(fs, f, bb_list, invalid_block);
    pclose(f);
    mke2fs_error_msg_and_die(retval, "read bad blocks from program");
}

static void handle_bad_blocks(ext2_filsys fs, badblocks_list bb_list)
{
    dgrp_t          i;
    blk_t           j;
    unsigned        must_be_good;
    blk_t           blk;
    badblocks_iterate   bb_iter;
    errcode_t       retval;
    blk_t           group_block;
    int         group;
    int         group_bad;

    if (!bb_list)
        return;

    /*
     * The primary superblock and group descriptors *must* be
     * good; if not, abort.
     */
    must_be_good = fs->super->s_first_data_block + 1 + fs->desc_blocks;
    for (i = fs->super->s_first_data_block; i <= must_be_good; i++) {
        if (ext2fs_badblocks_list_test(bb_list, i)) {
            bb_error_msg_and_die(
                "Block %d in primary superblock/group descriptor area bad\n"
                "Blocks %d through %d must be good in order to build a filesystem\n"
                "Aborting ...", i, fs->super->s_first_data_block, must_be_good);
        }
    }

    /*
     * See if any of the bad blocks are showing up in the backup
     * superblocks and/or group descriptors.  If so, issue a
     * warning and adjust the block counts appropriately.
     */
    group_block = fs->super->s_first_data_block +
        fs->super->s_blocks_per_group;

    for (i = 1; i < fs->group_desc_count; i++) {
        group_bad = 0;
        for (j=0; j < fs->desc_blocks+1; j++) {
            if (ext2fs_badblocks_list_test(bb_list,
                               group_block + j)) {
                mke2fs_warning_msg(!group_bad,
                    "the backup superblock/group descriptors at block %d contain\n"
                    "bad blocks\n", group_block);
                group_bad++;
                group = ext2fs_group_of_blk(fs, group_block+j);
                fs->group_desc[group].bg_free_blocks_count++;
                fs->super->s_free_blocks_count++;
            }
        }
        group_block += fs->super->s_blocks_per_group;
    }

    /*
     * Mark all the bad blocks as used...
     */
    retval = ext2fs_badblocks_list_iterate_begin(bb_list, &bb_iter);
    mke2fs_error_msg_and_die(retval, "mark bad blocks as used");

    while (ext2fs_badblocks_list_iterate(bb_iter, &blk))
        ext2fs_mark_block_bitmap(fs->block_map, blk);
    ext2fs_badblocks_list_iterate_end(bb_iter);
}

/*
 * These functions implement a generalized progress meter.
 */
struct progress_struct {
    char        format[20];
    char        backup[80];
    __u32       max;
    int     skip_progress;
};

static void progress_init(struct progress_struct *progress,
              const char *label,__u32 max)
{
    int i;

    memset(progress, 0, sizeof(struct progress_struct));
    if (quiet)
        return;

    /*
     * Figure out how many digits we need
     */
    i = int_log10(max);
    sprintf(progress->format, "%%%dd/%%%dld", i, i);
    memset(progress->backup, '\b', sizeof(progress->backup)-1);
    progress->backup[sizeof(progress->backup)-1] = 0;
    if ((2*i)+1 < (int) sizeof(progress->backup))
        progress->backup[(2*i)+1] = 0;
    progress->max = max;

    progress->skip_progress = 0;
    if (getenv("MKE2FS_SKIP_PROGRESS"))
        progress->skip_progress++;

    fputs(label, stdout);
    fflush(stdout);
}

static void progress_update(struct progress_struct *progress, __u32 val)
{
    if ((progress->format[0] == 0) || progress->skip_progress)
        return;
    printf(progress->format, val, progress->max);
    fputs(progress->backup, stdout);
}

static void progress_close(struct progress_struct *progress)
{
    if (progress->format[0] == 0)
        return;
    printf("%-28s\n", "done");
}


/*
 * Helper function which zeros out _num_ blocks starting at _blk_.  In
 * case of an error, the details of the error is returned via _ret_blk_
 * and _ret_count_ if they are non-NULL pointers.  Returns 0 on
 * success, and an error code on an error.
 *
 * As a special case, if the first argument is NULL, then it will
 * attempt to free the static zeroizing buffer.  (This is to keep
 * programs that check for memory leaks happy.)
 */
static errcode_t zero_blocks(ext2_filsys fs, blk_t blk, int num,
                 struct progress_struct *progress,
                 blk_t *ret_blk, int *ret_count)
{
    int     j, count, next_update, next_update_incr;
    static char *buf;
    errcode_t   retval;

    /* If fs is null, clean up the static buffer and return */
    if (!fs) {
        if (buf) {
            free(buf);
            buf = 0;
        }
        return 0;
    }
    /* Allocate the zeroizing buffer if necessary */
    if (!buf) {
        buf = xzalloc(fs->blocksize * STRIDE_LENGTH);
    }
    /* OK, do the write loop */
    next_update = 0;
    next_update_incr = num / 100;
    if (next_update_incr < 1)
        next_update_incr = 1;
    for (j=0; j < num; j += STRIDE_LENGTH, blk += STRIDE_LENGTH) {
        count = num - j;
        if (count > STRIDE_LENGTH)
            count = STRIDE_LENGTH;
        retval = io_channel_write_blk(fs->io, blk, count, buf);
        if (retval) {
            if (ret_count)
                *ret_count = count;
            if (ret_blk)
                *ret_blk = blk;
            return retval;
        }
        if (progress && j > next_update) {
            next_update += num / 100;
            progress_update(progress, blk);
        }
    }
    return 0;
}

static void write_inode_tables(ext2_filsys fs)
{
    errcode_t   retval;
    blk_t       blk;
    dgrp_t      i;
    int     num;
    struct progress_struct progress;

    if (quiet)
        memset(&progress, 0, sizeof(progress));
    else
        progress_init(&progress, "Writing inode tables: ",
                  fs->group_desc_count);

    for (i = 0; i < fs->group_desc_count; i++) {
        progress_update(&progress, i);

        blk = fs->group_desc[i].bg_inode_table;
        num = fs->inode_blocks_per_group;

        retval = zero_blocks(fs, blk, num, 0, &blk, &num);
        mke2fs_error_msg_and_die(retval,
            "write %d blocks in inode table starting at %d.",
            num, blk);
        if (sync_kludge) {
            if (sync_kludge == 1)
                sync();
            else if ((i % sync_kludge) == 0)
                sync();
        }
    }
    zero_blocks(0, 0, 0, 0, 0, 0);
    progress_close(&progress);
}

static void create_root_dir(ext2_filsys fs)
{
    errcode_t       retval;
    struct ext2_inode   inode;

    retval = ext2fs_mkdir(fs, EXT2_ROOT_INO, EXT2_ROOT_INO, 0);
    mke2fs_error_msg_and_die(retval, "create root dir");
    if (geteuid()) {
        retval = ext2fs_read_inode(fs, EXT2_ROOT_INO, &inode);
        mke2fs_error_msg_and_die(retval, "read root inode");
        inode.i_uid = getuid();
        if (inode.i_uid)
            inode.i_gid = getgid();
        retval = ext2fs_write_new_inode(fs, EXT2_ROOT_INO, &inode);
        mke2fs_error_msg_and_die(retval, "set root inode ownership");
    }
}

static void create_lost_and_found(ext2_filsys fs)
{
    errcode_t       retval;
    ext2_ino_t      ino;
    const char      *name = "lost+found";
    int         i = 1;
    char            *msg = "create";
    int         lpf_size = 0;

    fs->umask = 077;
    retval = ext2fs_mkdir(fs, EXT2_ROOT_INO, 0, name);
    if (retval) {
        goto CREATE_LOST_AND_FOUND_ERROR;
    }

    retval = ext2fs_lookup(fs, EXT2_ROOT_INO, name, strlen(name), 0, &ino);
    if (retval) {
        msg = "lookup";
        goto CREATE_LOST_AND_FOUND_ERROR;
    }

    for (; i < EXT2_NDIR_BLOCKS; i++) {
        if ((lpf_size += fs->blocksize) >= 16*1024)
            break;
        retval = ext2fs_expand_dir(fs, ino);
        msg = "expand";
CREATE_LOST_AND_FOUND_ERROR:
        mke2fs_error_msg_and_die(retval, "%s %s", msg, name);
    }
}

static void create_bad_block_inode(ext2_filsys fs, badblocks_list bb_list)
{
    errcode_t   retval;

    ext2fs_mark_inode_bitmap(fs->inode_map, EXT2_BAD_INO);
    fs->group_desc[0].bg_free_inodes_count--;
    fs->super->s_free_inodes_count--;
    retval = ext2fs_update_bb_inode(fs, bb_list);
    mke2fs_error_msg_and_die(retval, "set bad block inode");
}

static void reserve_inodes(ext2_filsys fs)
{
    ext2_ino_t  i;
    int     group;

    for (i = EXT2_ROOT_INO + 1; i < EXT2_FIRST_INODE(fs->super); i++) {
        ext2fs_mark_inode_bitmap(fs->inode_map, i);
        group = ext2fs_group_of_ino(fs, i);
        fs->group_desc[group].bg_free_inodes_count--;
        fs->super->s_free_inodes_count--;
    }
    ext2fs_mark_ib_dirty(fs);
}

#define BSD_DISKMAGIC   (0x82564557UL)  /* The disk magic number */
#define BSD_MAGICDISK   (0x57455682UL)  /* The disk magic number reversed */
#define BSD_LABEL_OFFSET        64

static void zap_sector(ext2_filsys fs, int sect, int nsect)
{
    char *buf;
    char *fmt = "could not %s %d";
    int retval;
    unsigned int *magic;

    buf = xmalloc(512*nsect);

    if (sect == 0) {
        /* Check for a BSD disklabel, and don't erase it if so */
        retval = io_channel_read_blk(fs->io, 0, -512, buf);
        if (retval)
            mke2fs_warning_msg(retval, fmt, "read block", 0);
        else {
            magic = (unsigned int *) (buf + BSD_LABEL_OFFSET);
            if ((*magic == BSD_DISKMAGIC) ||
                (*magic == BSD_MAGICDISK))
                return;
        }
    }

    memset(buf, 0, 512*nsect);
    io_channel_set_blksize(fs->io, 512);
    retval = io_channel_write_blk(fs->io, sect, -512*nsect, buf);
    io_channel_set_blksize(fs->io, fs->blocksize);
    free(buf);
    mke2fs_warning_msg(retval, fmt, "erase sector", sect);
}

static void create_journal_dev(ext2_filsys fs)
{
    struct progress_struct  progress;
    errcode_t       retval;
    char            *buf;
    char            *fmt = "%s journal superblock";
    blk_t           blk;
    int         count;

    retval = ext2fs_create_journal_superblock(fs,
                  fs->super->s_blocks_count, 0, &buf);
    mke2fs_error_msg_and_die(retval, fmt, "init");
    if (quiet)
        memset(&progress, 0, sizeof(progress));
    else
        progress_init(&progress, "Zeroing journal device: ",
                  fs->super->s_blocks_count);

    retval = zero_blocks(fs, 0, fs->super->s_blocks_count,
                 &progress, &blk, &count);
    mke2fs_error_msg_and_die(retval, "zero journal device (block %u, count %d)",
            blk, count);
    zero_blocks(0, 0, 0, 0, 0, 0);

    retval = io_channel_write_blk(fs->io,
                      fs->super->s_first_data_block+1,
                      1, buf);
    mke2fs_error_msg_and_die(retval, fmt, "write");
    progress_close(&progress);
}

static void show_stats(ext2_filsys fs)
{
    struct ext2_super_block *s = fs->super;
    char            *os;
    blk_t           group_block;
    dgrp_t          i;
    int         need, col_left;

    mke2fs_warning_msg((param.s_blocks_count != s->s_blocks_count),
        "%d blocks unused\n", param.s_blocks_count - s->s_blocks_count);
    os = e2p_os2string(fs->super->s_creator_os);
    printf( "Filesystem label=%.*s\n"
            "OS type: %s\n"
            "Block size=%u (log=%u)\n"
            "Fragment size=%u (log=%u)\n"
            "%u inodes, %u blocks\n"
            "%u blocks (%2.2f%%) reserved for the super user\n"
            "First data block=%u\n",
            (int) sizeof(s->s_volume_name),
            s->s_volume_name,
            os,
            fs->blocksize, s->s_log_block_size,
            fs->fragsize, s->s_log_frag_size,
            s->s_inodes_count, s->s_blocks_count,
            s->s_r_blocks_count, 100.0 * s->s_r_blocks_count / s->s_blocks_count,
            s->s_first_data_block);
    free(os);
    if (s->s_reserved_gdt_blocks) {
        printf("Maximum filesystem blocks=%lu\n",
               (s->s_reserved_gdt_blocks + fs->desc_blocks) *
               (fs->blocksize / sizeof(struct ext2_group_desc)) *
               s->s_blocks_per_group);
    }
    printf( "%u block group%s\n"
            "%u blocks per group, %u fragments per group\n"
            "%u inodes per group\n",
            fs->group_desc_count, (fs->group_desc_count > 1) ? "s" : "",
            s->s_blocks_per_group, s->s_frags_per_group,
            s->s_inodes_per_group);
    if (fs->group_desc_count == 1) {
        puts("");
        return;
    }

    printf("Superblock backups stored on blocks: ");
    group_block = s->s_first_data_block;
    col_left = 0;
    for (i = 1; i < fs->group_desc_count; i++) {
        group_block += s->s_blocks_per_group;
        if (!ext2fs_bg_has_super(fs, i))
            continue;
        if (i != 1)
            printf(", ");
        need = int_log10(group_block) + 2;
        if (need > col_left) {
            printf("\n\t");
            col_left = 72;
        }
        col_left -= need;
        printf("%u", group_block);
    }
    puts("\n");
}

/*
 * Set the S_CREATOR_OS field.  Return true if OS is known,
 * otherwise, 0.
 */
static int set_os(struct ext2_super_block *sb, char *os)
{
    if (isdigit (*os)) {
        sb->s_creator_os = atoi(os);
        return 1;
    }

    if((sb->s_creator_os = e2p_string2os(os)) >= 0) {
        return 1;
    } else if (!strcasecmp("GNU", os)) {
        sb->s_creator_os = EXT2_OS_HURD;
        return 1;
    }
    return 0;
}

static void parse_extended_opts(struct ext2_super_block *sb_param,
                const char *opts)
{
    char    *buf, *token, *next, *p, *arg;
    int r_usage = 0;

    buf = xstrdup(opts);
    for (token = buf; token && *token; token = next) {
        p = strchr(token, ',');
        next = 0;
        if (p) {
            *p = 0;
            next = p+1;
        }
        arg = strchr(token, '=');
        if (arg) {
            *arg = 0;
            arg++;
        }
        if (strcmp(token, "stride") == 0) {
            if (!arg) {
                r_usage++;
                continue;
            }
            fs_stride = strtoul(arg, &p, 0);
            if (*p || (fs_stride == 0)) {
                bb_error_msg("Invalid stride parameter: %s", arg);
                r_usage++;
                continue;
            }
        } else if (!strcmp(token, "resize")) {
            unsigned long resize, bpg, rsv_groups;
            unsigned long group_desc_count, desc_blocks;
            unsigned int gdpb, blocksize;
            int rsv_gdb;

            if (!arg) {
                r_usage++;
                continue;
            }

            resize = parse_num_blocks(arg,
                          sb_param->s_log_block_size);

            if (resize == 0) {
                bb_error_msg("Invalid resize parameter: %s", arg);
                r_usage++;
                continue;
            }
            if (resize <= sb_param->s_blocks_count) {
                bb_error_msg("The resize maximum must be greater "
                        "than the filesystem size");
                r_usage++;
                continue;
            }

            blocksize = EXT2_BLOCK_SIZE(sb_param);
            bpg = sb_param->s_blocks_per_group;
            if (!bpg)
                bpg = blocksize * 8;
            gdpb = blocksize / sizeof(struct ext2_group_desc);
            group_desc_count = (sb_param->s_blocks_count +
                        bpg - 1) / bpg;
            desc_blocks = (group_desc_count +
                       gdpb - 1) / gdpb;
            rsv_groups = (resize + bpg - 1) / bpg;
            rsv_gdb = (rsv_groups + gdpb - 1) / gdpb -
                desc_blocks;
            if (rsv_gdb > EXT2_ADDR_PER_BLOCK(sb_param))
                rsv_gdb = EXT2_ADDR_PER_BLOCK(sb_param);

            if (rsv_gdb > 0) {
                sb_param->s_feature_compat |=
                    EXT2_FEATURE_COMPAT_RESIZE_INODE;

                sb_param->s_reserved_gdt_blocks = rsv_gdb;
            }
        } else
            r_usage++;
    }
    if (r_usage) {
        bb_error_msg_and_die(
            "\nBad options specified.\n\n"
            "Extended options are separated by commas, "
            "and may take an argument which\n"
            "\tis set off by an equals ('=') sign.\n\n"
            "Valid extended options are:\n"
            "\tstride=<stride length in blocks>\n"
            "\tresize=<resize maximum size in blocks>\n");
    }
}

static __u32 ok_features[3] = {
    EXT3_FEATURE_COMPAT_HAS_JOURNAL |
        EXT2_FEATURE_COMPAT_RESIZE_INODE |
        EXT2_FEATURE_COMPAT_DIR_INDEX,  /* Compat */
    EXT2_FEATURE_INCOMPAT_FILETYPE|         /* Incompat */
        EXT3_FEATURE_INCOMPAT_JOURNAL_DEV|
        EXT2_FEATURE_INCOMPAT_META_BG,
    EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER     /* R/O compat */
};

static int PRS(int argc, char **argv)
{
    int     c;
    int     size;
    char *      tmp;
    int     blocksize = 0;
    int     inode_ratio = 0;
    int     inode_size = 0;
    int     reserved_ratio = 5;
    int     sector_size = 0;
    int     show_version_only = 0;
    ext2_ino_t  num_inodes = 0;
    errcode_t   retval;
    char *      extended_opts = 0;
    const char *    fs_type = 0;
    blk_t       dev_size;
    long        sysval;

    /* Update our PATH to include /sbin  */
    e2fs_set_sbin_path();

    tmp = getenv("MKE2FS_SYNC");
    if (tmp)
        sync_kludge = atoi(tmp);

    /* Determine the system page size if possible */
#if (!defined(_SC_PAGESIZE) && defined(_SC_PAGE_SIZE))
#define _SC_PAGESIZE _SC_PAGE_SIZE
#endif
#ifdef _SC_PAGESIZE
    sysval = sysconf(_SC_PAGESIZE);
    if (sysval > 0)
        sys_page_size = sysval;
#endif /* _SC_PAGESIZE */

    setbuf(stdout, NULL);
    setbuf(stderr, NULL);
    memset(&param, 0, sizeof(struct ext2_super_block));
    param.s_rev_level = 1;  /* Create revision 1 filesystems now */
    param.s_feature_incompat |= EXT2_FEATURE_INCOMPAT_FILETYPE;
    param.s_feature_ro_compat |= EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER;

#ifdef __linux__
    linux_version_code = get_linux_version_code();
    if (linux_version_code && linux_version_code < KERNEL_VERSION(2,2,0)) {
        param.s_rev_level = 0;
        param.s_feature_incompat = 0;
        param.s_feature_compat = 0;
        param.s_feature_ro_compat = 0;
    }
#endif

    /* If called as mkfs.ext3, create a journal inode */
    if (last_char_is(applet_name, '3'))
        journal_size = -1;

    while ((c = getopt (argc, argv,
            "b:cE:f:g:i:jl:m:no:qr:R:s:tvI:J:ST:FL:M:N:O:V")) != EOF) {
        switch (c) {
        case 'b':
            blocksize = xatou_range(optarg, EXT2_MIN_BLOCK_SIZE, EXT2_MAX_BLOCK_SIZE);
            mke2fs_warning_msg((blocksize > 4096),
                "blocksize %d not usable on most systems",
                blocksize);
            param.s_log_block_size =
                int_log2(blocksize >> EXT2_MIN_BLOCK_LOG_SIZE);
            break;
        case 'c':   /* Check for bad blocks */
        case 't':   /* deprecated */
            cflag++;
            break;
        case 'f':
            size = xatou_range(optarg, EXT2_MIN_BLOCK_SIZE, EXT2_MAX_BLOCK_SIZE);
            param.s_log_frag_size =
                int_log2(size >> EXT2_MIN_BLOCK_LOG_SIZE);
            mke2fs_warning_msg(1, "fragments not supported. Ignoring -f option");
            break;
        case 'g':
            param.s_blocks_per_group = xatou32(optarg);
            if ((param.s_blocks_per_group % 8) != 0) {
                bb_error_msg_and_die("blocks per group must be multiple of 8");
            }
            break;
        case 'i':
            /* Huh? is "* 1024" correct? */
            inode_ratio = xatou_range(optarg, EXT2_MIN_BLOCK_SIZE, EXT2_MAX_BLOCK_SIZE * 1024);
            break;
        case 'J':
            parse_journal_opts(&journal_device, &journal_flags, &journal_size, optarg);
            break;
        case 'j':
            param.s_feature_compat |=
                EXT3_FEATURE_COMPAT_HAS_JOURNAL;
            if (!journal_size)
                journal_size = -1;
            break;
        case 'l':
            bad_blocks_filename = optarg;
            break;
        case 'm':
            reserved_ratio = xatou_range(optarg, 0, 50);
            break;
        case 'n':
            noaction++;
            break;
        case 'o':
            creator_os = optarg;
            break;
        case 'r':
            param.s_rev_level = xatoi_u(optarg);
            if (param.s_rev_level == EXT2_GOOD_OLD_REV) {
                param.s_feature_incompat = 0;
                param.s_feature_compat = 0;
                param.s_feature_ro_compat = 0;
            }
            break;
        case 's':   /* deprecated */
            if (xatou(optarg))
                param.s_feature_ro_compat |=
                    EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER;
            else
                param.s_feature_ro_compat &=
                    ~EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER;
            break;
#ifdef EXT2_DYNAMIC_REV
        case 'I':
            inode_size = xatoi_u(optarg);
            break;
#endif
        case 'N':
            num_inodes = xatoi_u(optarg);
            break;
        case 'v':
            quiet = 0;
            break;
        case 'q':
            quiet = 1;
            break;
        case 'F':
            force = 1;
            break;
        case 'L':
            volume_label = optarg;
            break;
        case 'M':
            mount_dir = optarg;
            break;
        case 'O':
            if (!strcmp(optarg, "none")) {
                param.s_feature_compat = 0;
                param.s_feature_incompat = 0;
                param.s_feature_ro_compat = 0;
                break;
            }
            if (e2p_edit_feature(optarg,
                        &param.s_feature_compat,
                        ok_features)) {
                bb_error_msg_and_die("Invalid filesystem option set: %s", optarg);
            }
            break;
        case 'E':
        case 'R':
            extended_opts = optarg;
            break;
        case 'S':
            super_only = 1;
            break;
        case 'T':
            fs_type = optarg;
            break;
        case 'V':
            /* Print version number and exit */
            show_version_only = 1;
            quiet = 0;
            break;
        default:
            bb_show_usage();
        }
    }
    if ((optind == argc) /*&& !show_version_only*/)
        bb_show_usage();
    device_name = argv[optind++];

    mke2fs_verbose("mke2fs %s (%s)\n", E2FSPROGS_VERSION, E2FSPROGS_DATE);

    if (show_version_only) {
        return 0;
    }

    /*
     * If there's no blocksize specified and there is a journal
     * device, use it to figure out the blocksize
     */
    if (blocksize <= 0 && journal_device) {
        ext2_filsys     jfs;
        io_manager      io_ptr;

#ifdef CONFIG_TESTIO_DEBUG
        io_ptr = test_io_manager;
        test_io_backing_manager = unix_io_manager;
#else
        io_ptr = unix_io_manager;
#endif
        retval = ext2fs_open(journal_device,
                     EXT2_FLAG_JOURNAL_DEV_OK, 0,
                     0, io_ptr, &jfs);
        mke2fs_error_msg_and_die(retval, "open journal device %s", journal_device);
        if ((blocksize < 0) && (jfs->blocksize < (unsigned) (-blocksize))) {
            bb_error_msg_and_die(
                "Journal dev blocksize (%d) smaller than "
                "minimum blocksize %d\n", jfs->blocksize,
                -blocksize);
        }
        blocksize = jfs->blocksize;
        param.s_log_block_size =
            int_log2(blocksize >> EXT2_MIN_BLOCK_LOG_SIZE);
        ext2fs_close(jfs);
    }

    if (blocksize > sys_page_size) {
        mke2fs_warning_msg(1, "%d-byte blocks too big for system (max %d)",
            blocksize, sys_page_size);
        if (!force) {
            proceed_question();
        }
        bb_error_msg("Forced to continue");
    }
    mke2fs_warning_msg(((blocksize > 4096) &&
        (param.s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL)),
        "some 2.4 kernels do not support "
        "blocksizes greater than 4096 using ext3.\n"
        "Use -b 4096 if this is an issue for you\n");

    if (optind < argc) {
        param.s_blocks_count = parse_num_blocks(argv[optind++],
                param.s_log_block_size);
        mke2fs_error_msg_and_die(!param.s_blocks_count, "invalid blocks count - %s", argv[optind - 1]);
    }
    if (optind < argc)
        bb_show_usage();

    if (param.s_feature_incompat & EXT3_FEATURE_INCOMPAT_JOURNAL_DEV) {
        if (!fs_type)
            fs_type = "journal";
        reserved_ratio = 0;
        param.s_feature_incompat = EXT3_FEATURE_INCOMPAT_JOURNAL_DEV;
        param.s_feature_compat = 0;
        param.s_feature_ro_compat = 0;
    }
    if (param.s_rev_level == EXT2_GOOD_OLD_REV &&
        (param.s_feature_compat || param.s_feature_ro_compat ||
         param.s_feature_incompat))
        param.s_rev_level = 1;  /* Create a revision 1 filesystem */

    check_plausibility(device_name , force);
    check_mount(device_name, force, "filesystem");

    param.s_log_frag_size = param.s_log_block_size;

    if (noaction && param.s_blocks_count) {
        dev_size = param.s_blocks_count;
        retval = 0;
    } else {
    retry:
        retval = ext2fs_get_device_size(device_name,
                        EXT2_BLOCK_SIZE(&param),
                        &dev_size);
        if ((retval == EFBIG) &&
            (blocksize == 0) &&
            (param.s_log_block_size == 0)) {
            param.s_log_block_size = 2;
            blocksize = 4096;
            goto retry;
        }
    }

    mke2fs_error_msg_and_die((retval && (retval != EXT2_ET_UNIMPLEMENTED)),"determine filesystem size");

    if (!param.s_blocks_count) {
        if (retval == EXT2_ET_UNIMPLEMENTED) {
            mke2fs_error_msg_and_die(1,
                "determine device size; you "
                "must specify\nthe size of the "
                "filesystem");
        } else {
            if (dev_size == 0) {
                bb_error_msg_and_die(
                    "Device size reported to be zero.  "
                    "Invalid partition specified, or\n\t"
                    "partition table wasn't reread "
                    "after running fdisk, due to\n\t"
                    "a modified partition being busy "
                    "and in use.  You may need to reboot\n\t"
                    "to re-read your partition table.\n"
                );
            }
            param.s_blocks_count = dev_size;
            if (sys_page_size > EXT2_BLOCK_SIZE(&param))
                param.s_blocks_count &= ~((sys_page_size /
                               EXT2_BLOCK_SIZE(&param))-1);
        }

    } else if (!force && (param.s_blocks_count > dev_size)) {
        bb_error_msg("Filesystem larger than apparent device size");
        proceed_question();
    }

    /*
     * If the user asked for HAS_JOURNAL, then make sure a journal
     * gets created.
     */
    if ((param.s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL) &&
        !journal_size)
        journal_size = -1;

    /* Set first meta blockgroup via an environment variable */
    /* (this is mostly for debugging purposes) */
    if ((param.s_feature_incompat & EXT2_FEATURE_INCOMPAT_META_BG) &&
        ((tmp = getenv("MKE2FS_FIRST_META_BG"))))
        param.s_first_meta_bg = atoi(tmp);

    /* Get the hardware sector size, if available */
    retval = ext2fs_get_device_sectsize(device_name, &sector_size);
    mke2fs_error_msg_and_die(retval, "determine hardware sector size");

    if ((tmp = getenv("MKE2FS_DEVICE_SECTSIZE")) != NULL)
        sector_size = atoi(tmp);

    set_fs_defaults(fs_type, &param, blocksize, sector_size, &inode_ratio);
    blocksize = EXT2_BLOCK_SIZE(&param);

    if (extended_opts)
        parse_extended_opts(&param, extended_opts);

    /* Since sparse_super is the default, we would only have a problem
     * here if it was explicitly disabled.
     */
    if ((param.s_feature_compat & EXT2_FEATURE_COMPAT_RESIZE_INODE) &&
        !(param.s_feature_ro_compat&EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER)) {
        bb_error_msg_and_die("reserved online resize blocks not supported "
              "on non-sparse filesystem");
    }

    if (param.s_blocks_per_group) {
        if (param.s_blocks_per_group < 256 ||
            param.s_blocks_per_group > 8 * (unsigned) blocksize) {
            bb_error_msg_and_die("blocks per group count out of range");
        }
    }

    if (!force && param.s_blocks_count >= (1 << 31)) {
        bb_error_msg_and_die("Filesystem too large.  No more than 2**31-1 blocks\n"
            "\t (8TB using a blocksize of 4k) are currently supported.");
    }

    if (inode_size) {
        if (inode_size < EXT2_GOOD_OLD_INODE_SIZE ||
            inode_size > EXT2_BLOCK_SIZE(&param) ||
            inode_size & (inode_size - 1)) {
            bb_error_msg_and_die("invalid inode size %d (min %d/max %d)",
                inode_size, EXT2_GOOD_OLD_INODE_SIZE,
                blocksize);
        }
        mke2fs_warning_msg((inode_size != EXT2_GOOD_OLD_INODE_SIZE),
            "%d-byte inodes not usable on most systems",
            inode_size);
        param.s_inode_size = inode_size;
    }

    /*
     * Calculate number of inodes based on the inode ratio
     */
    param.s_inodes_count = num_inodes ? num_inodes :
        ((__u64) param.s_blocks_count * blocksize)
            / inode_ratio;

    /*
     * Calculate number of blocks to reserve
     */
    param.s_r_blocks_count = (param.s_blocks_count * reserved_ratio) / 100;
    return 1;
}

static void mke2fs_clean_up(void)
{
    if (ENABLE_FEATURE_CLEAN_UP && journal_device) free(journal_device);
}

int mke2fs_main (int argc, char **argv);
int mke2fs_main (int argc, char **argv)
{
    errcode_t   retval;
    ext2_filsys fs;
    badblocks_list  bb_list = 0;
    unsigned int    i;
    int     val;
    io_manager  io_ptr;

    if (ENABLE_FEATURE_CLEAN_UP)
        atexit(mke2fs_clean_up);
    if(!PRS(argc, argv))
        return 0;

#ifdef CONFIG_TESTIO_DEBUG
    io_ptr = test_io_manager;
    test_io_backing_manager = unix_io_manager;
#else
    io_ptr = unix_io_manager;
#endif

    /*
     * Initialize the superblock....
     */
    retval = ext2fs_initialize(device_name, 0, &param,
                   io_ptr, &fs);
    mke2fs_error_msg_and_die(retval, "set up superblock");

    /*
     * Wipe out the old on-disk superblock
     */
    if (!noaction)
        zap_sector(fs, 2, 6);

    /*
     * Generate a UUID for it...
     */
    uuid_generate(fs->super->s_uuid);

    /*
     * Initialize the directory index variables
     */
    fs->super->s_def_hash_version = EXT2_HASH_TEA;
    uuid_generate((unsigned char *) fs->super->s_hash_seed);

    /*
     * Add "jitter" to the superblock's check interval so that we
     * don't check all the filesystems at the same time.  We use a
     * kludgy hack of using the UUID to derive a random jitter value.
     */
    for (i = 0, val = 0; i < sizeof(fs->super->s_uuid); i++)
        val += fs->super->s_uuid[i];
    fs->super->s_max_mnt_count += val % EXT2_DFL_MAX_MNT_COUNT;

    /*
     * Override the creator OS, if applicable
     */
    if (creator_os && !set_os(fs->super, creator_os)) {
        bb_error_msg_and_die("unknown os - %s", creator_os);
    }

    /*
     * For the Hurd, we will turn off filetype since it doesn't
     * support it.
     */
    if (fs->super->s_creator_os == EXT2_OS_HURD)
        fs->super->s_feature_incompat &=
            ~EXT2_FEATURE_INCOMPAT_FILETYPE;

    /*
     * Set the volume label...
     */
    if (volume_label) {
        snprintf(fs->super->s_volume_name, sizeof(fs->super->s_volume_name), "%s", volume_label);
    }

    /*
     * Set the last mount directory
     */
    if (mount_dir) {
        snprintf(fs->super->s_last_mounted, sizeof(fs->super->s_last_mounted), "%s", mount_dir);
    }

    if (!quiet || noaction)
        show_stats(fs);

    if (noaction)
        return 0;

    if (fs->super->s_feature_incompat &
        EXT3_FEATURE_INCOMPAT_JOURNAL_DEV) {
        create_journal_dev(fs);
        return (ext2fs_close(fs) ? 1 : 0);
    }

    if (bad_blocks_filename)
        read_bb_file(fs, &bb_list, bad_blocks_filename);
    if (cflag)
        test_disk(fs, &bb_list);

    handle_bad_blocks(fs, bb_list);
    fs->stride = fs_stride;
    retval = ext2fs_allocate_tables(fs);
    mke2fs_error_msg_and_die(retval, "allocate filesystem tables");
    if (super_only) {
        fs->super->s_state |= EXT2_ERROR_FS;
        fs->flags &= ~(EXT2_FLAG_IB_DIRTY|EXT2_FLAG_BB_DIRTY);
    } else {
        /* rsv must be a power of two (64kB is MD RAID sb alignment) */
        unsigned int rsv = 65536 / fs->blocksize;
        unsigned long blocks = fs->super->s_blocks_count;
        unsigned long start;
        blk_t ret_blk;

#ifdef ZAP_BOOTBLOCK
        zap_sector(fs, 0, 2);
#endif

        /*
         * Wipe out any old MD RAID (or other) metadata at the end
         * of the device.  This will also verify that the device is
         * as large as we think.  Be careful with very small devices.
         */
        start = (blocks & ~(rsv - 1));
        if (start > rsv)
            start -= rsv;
        if (start > 0)
            retval = zero_blocks(fs, start, blocks - start,
                         NULL, &ret_blk, NULL);

        mke2fs_warning_msg(retval, "cannot zero block %u at end of filesystem", ret_blk);
        write_inode_tables(fs);
        create_root_dir(fs);
        create_lost_and_found(fs);
        reserve_inodes(fs);
        create_bad_block_inode(fs, bb_list);
        if (fs->super->s_feature_compat &
            EXT2_FEATURE_COMPAT_RESIZE_INODE) {
            retval = ext2fs_create_resize_inode(fs);
            mke2fs_error_msg_and_die(retval, "reserve blocks for online resize");
        }
    }

    if (journal_device) {
        make_journal_device(journal_device, fs, quiet, force);
    } else if (journal_size) {
        make_journal_blocks(fs, journal_size, journal_flags, quiet);
    }

    mke2fs_verbose("Writing superblocks and filesystem accounting information: ");
    retval = ext2fs_flush(fs);
    mke2fs_warning_msg(retval, "had trouble writing out superblocks");
    mke2fs_verbose_done();
    if (!quiet && !getenv("MKE2FS_SKIP_CHECK_MSG"))
        print_check_message(fs);
    val = ext2fs_close(fs);
    return (retval || val) ? 1 : 0;
}