/* 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_for_read(bad_blocks_file);
        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) {
                bb_putchar('\n');
                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;
}