fslib/ext2lib/Mke2fs.c

/*
 * PROJECT:          Mke2fs
 * FILE:             Disk.c
 * PROGRAMMER:       Matt Wu <mattwu@163.com>
 * HOMEPAGE:         http://ext2.yeah.net
 */

/* INCLUDES **************************************************************/

#include "Mke2fs.h"

#include <fmifs/fmifs.h>
#include <debug.h>

/* GLOBALS ***************************************************************/

int     inode_ratio = 4096;

BOOLEAN bLocked = FALSE;

/* This is needed for the ext2fs driver to mount the volume */
#define ZAP_BOOTBLOCK

/* FUNCTIONS *************************************************************/

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

    arg >>= 1;

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

    return l;
}

int int_log10(unsigned int arg)
{
    int l;

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

    return l;
}


static char default_str[] = "default";

struct mke2fs_defaults {
    const char  *type;
    int     size;
    int     blocksize;
    int     inode_ratio;
} 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},
};

void set_fs_defaults(const char *fs_type,
                PEXT2_SUPER_BLOCK super,
                int blocksize, int *inode_ratio)
{
    int megs;
    int ratio = 0;
    struct mke2fs_defaults *p;

    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;

        if (blocksize == 0)
        {
            super->s_log_frag_size = super->s_log_block_size =
                int_log2(p->blocksize >> EXT2_MIN_BLOCK_LOG_SIZE);
        }
    }

    if (blocksize == 0)
    {
        super->s_blocks_count /= EXT2_BLOCK_SIZE(super) / 1024;
    }
}

/*
 * 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.)
 */
bool zero_blocks(PEXT2_FILESYS fs, ULONG blk, ULONG num,
                 ULONG *ret_blk, ULONG *ret_count)
{
    ULONG       j, count;
    static unsigned char        *buf;
    bool        retval;

    /* If fs is null, clean up the static buffer and return */
    if (!fs)
    {
        if (buf)
        {
            RtlFreeHeap(RtlGetProcessHeap(), 0, buf);
            buf = 0;
        }
        return true;
    }

#define STRIDE_LENGTH 8

    /* Allocate the zeroizing buffer if necessary */
    if (!buf)
    {
        buf = (unsigned char *)
            RtlAllocateHeap(RtlGetProcessHeap(), 0, fs->blocksize * STRIDE_LENGTH);
        if (!buf)
        {
            DPRINT1("Mke2fs: while allocating zeroizing buffer");
            if (ret_blk)
                *ret_blk = blk;
            return false;
        }
        memset(buf, 0, fs->blocksize * STRIDE_LENGTH);
    }

    /* OK, do the write loop */
    for (j=0; j < num; j += STRIDE_LENGTH, blk += STRIDE_LENGTH)
    {
        if (num-j > STRIDE_LENGTH)
            count = STRIDE_LENGTH;
        else
            count = num - j;

        retval = NT_SUCCESS(Ext2WriteDisk(
                        fs,
                        ((ULONGLONG)blk * fs->blocksize),
                        count * fs->blocksize,
                        buf));

        if (!retval)
        {
            if (ret_count)
                *ret_count = count;

            if (ret_blk)
                *ret_blk = blk;

            return retval;
        }
    }

    return true;
}


bool zap_sector(PEXT2_FILESYS Ext2Sys, int sect, int nsect)
{
    unsigned char *buf;
    ULONG         *magic;

    buf = (unsigned char *)
        RtlAllocateHeap(RtlGetProcessHeap(), 0, SECTOR_SIZE*nsect);
    if (!buf)
    {
        DPRINT1("Mke2fs: Out of memory erasing sectors %d-%d\n",
                sect, sect + nsect - 1);
        return false;
    }

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

    if (sect == 0)
    {
        Ext2ReadDisk(
                  Ext2Sys,
                  (LONGLONG)(sect * SECTOR_SIZE),
                  SECTOR_SIZE, buf);

        // Check for a BSD disklabel, and don't erase it if so
        magic = (ULONG *) (buf + BSD_LABEL_OFFSET);
        if ((*magic == BSD_DISKMAGIC) ||   (*magic == BSD_MAGICDISK))
                goto clean_up;
    }

    memset(buf, 0, (ULONG)nsect * SECTOR_SIZE);

    // Write buf to disk
    Ext2WriteDisk( Ext2Sys,
                   (LONGLONG)(sect * SECTOR_SIZE),
                   (ULONG)nsect * SECTOR_SIZE,
                   buf );

clean_up:

    RtlFreeHeap(RtlGetProcessHeap(), 0, buf);

    return true;
}

bool ext2_mkdir( PEXT2_FILESYS fs,
                 ULONG parent,
                 ULONG inum,
                 char *name,
                 ULONG *no,
                 PEXT2_INODE pid )
{
    bool            retval;
    EXT2_INODE      parent_inode, inode;
    ULONG           ino = inum;
    //ULONG         scratch_ino;
    ULONG           blk;
    char            *block = 0;
    int             filetype = 0;

    LARGE_INTEGER   SysTime;

    NtQuerySystemTime(&SysTime);

    /*
     * Allocate an inode, if necessary
     */
    if (!ino)
    {
        retval = ext2_new_inode(fs, parent, LINUX_S_IFDIR | 0755, 0, &ino);
        if (!retval)
            goto cleanup;
    }

    if (no)
        *no = ino;

    /*
     * Allocate a data block for the directory
     */
    retval = ext2_new_block(fs, 0, 0, &blk);
    if (!retval)
        goto cleanup;

    /*
     * Create a scratch template for the directory
     */
    retval = ext2_new_dir_block(fs, ino, parent, &block);
    if (!retval)
        goto cleanup;

    /*
     * Get the parent's inode, if necessary
     */
    if (parent != ino)
    {
        retval = ext2_load_inode(fs, parent, &parent_inode);
        if (!retval)
            goto cleanup;
    }
    else
    {
        memset(&parent_inode, 0, sizeof(parent_inode));
    }

    /*
     * Create the inode structure....
     */
    memset(&inode, 0, sizeof(EXT2_INODE));
    inode.i_mode = (USHORT)(LINUX_S_IFDIR | (0777 & ~fs->umask));
    inode.i_uid = inode.i_gid = 0;
    inode.i_blocks = fs->blocksize / 512;
    inode.i_block[0] = blk;
    inode.i_links_count = 2;
    RtlTimeToSecondsSince1970(&SysTime, &inode.i_mtime);
    inode.i_ctime = inode.i_atime = inode.i_mtime;
    inode.i_size = fs->blocksize;

    /*
     * Write out the inode and inode data block
     */
    retval = ext2_write_block(fs, blk, block);
    if (!retval)
        goto cleanup;

    retval = ext2_save_inode(fs, ino, &inode);
    if (!retval)
        goto cleanup;

    if (pid)
    {
        *pid = inode;
    }

    if (parent != ino)
    {
        /*
         * Add entry for this inode to parent dir 's block
         */

        if (fs->ext2_sb->s_feature_incompat & EXT2_FEATURE_INCOMPAT_FILETYPE)
                filetype = EXT2_FT_DIR;

        retval = ext2_add_entry(fs, parent, ino, filetype, name);

        if (!retval)
            goto cleanup;

        /*
         * Update parent inode's counts
         */

        parent_inode.i_links_count++;
        retval = ext2_save_inode(fs, parent, &parent_inode);
        if (!retval)
            goto cleanup;

    }

    /*
     * Update accounting....
     */
    ext2_block_alloc_stats(fs, blk, +1);
    ext2_inode_alloc_stats2(fs, ino, +1, 1);

cleanup:

    if (block)
    {
        RtlFreeHeap(RtlGetProcessHeap(), 0, block);
        block = NULL;
    }

    return retval;
}

bool create_root_dir(PEXT2_FILESYS fs)
{
    bool        retval;
    EXT2_INODE  inode;

    retval = ext2_mkdir(fs, EXT2_ROOT_INO, EXT2_ROOT_INO, 0, NULL, &inode);

    if (!retval)
    {
        DPRINT1("Mke2fs: while creating root dir");
        return false;
    }

    {
        inode.i_uid = 0;
        inode.i_gid = 0;

        retval = ext2_save_inode(fs, EXT2_ROOT_INO, &inode);
        if (!retval)
        {
            DPRINT1("Mke2fs: while setting root inode ownership");
            return false;
        }
    }

    return true;
}

bool create_lost_and_found(PEXT2_FILESYS Ext2Sys)
{
    bool        retval;
    ULONG       ino;
    char        *name = "lost+found";
    int         lpf_size = 0;
    EXT2_INODE  inode;
    ULONG       dwBlk = 0;
    BOOLEAN     bExt= TRUE;

    PEXT2_DIR_ENTRY dir;

    char *      buf;

    buf = (char *)RtlAllocateHeap(RtlGetProcessHeap(), 0, Ext2Sys->blocksize);
    if (!buf)
    {
        bExt = FALSE;
    }
    else
    {
        memset(buf, 0, Ext2Sys->blocksize);

        dir = (PEXT2_DIR_ENTRY) buf;
        dir->rec_len = Ext2Sys->blocksize;
    }

    Ext2Sys->umask = 077;
    retval = ext2_mkdir(Ext2Sys, EXT2_ROOT_INO, 0, name, &ino, &inode);

    if (!retval)
    {
        DPRINT1("Mke2fs: while creating /lost+found.\n");
        return false;
    }

    if (!bExt)
        goto errorout;

    lpf_size = inode.i_size;

    while(TRUE)
    {
        if (lpf_size >= 16*1024)
            break;

        retval = ext2_alloc_block(Ext2Sys, 0, &dwBlk);

        if (! retval)
        {
            DPRINT1("Mke2fs: create_lost_and_found: error alloc block.\n");
            break;
        }

        retval = ext2_expand_inode(Ext2Sys, &inode, dwBlk);
        if (!retval)
        {
            DPRINT1("Mke2fs: errors when expanding /lost+found.\n");
            break;
        }

        ext2_write_block(Ext2Sys, dwBlk, buf);

        inode.i_blocks += (Ext2Sys->blocksize/SECTOR_SIZE);
        lpf_size += Ext2Sys->blocksize;
    }

    {
        inode.i_size = lpf_size;

        ASSERT( (inode.i_size/Ext2Sys->blocksize) ==
                Ext2DataBlocks(Ext2Sys, inode.i_blocks/(Ext2Sys->blocksize/SECTOR_SIZE)));

        ASSERT( (inode.i_blocks/(Ext2Sys->blocksize/SECTOR_SIZE)) ==
                Ext2TotalBlocks(Ext2Sys, inode.i_size/Ext2Sys->blocksize));

    }

    ext2_save_inode(Ext2Sys, ino, &inode);

errorout:

    if (buf)
    {
        RtlFreeHeap(RtlGetProcessHeap(), 0, buf);
    }

    return true;
}

/*
 * This function forces out the primary superblock.  We need to only
 * write out those fields which we have changed, since if the
 * filesystem is mounted, it may have changed some of the other
 * fields.
 *
 * It takes as input a superblock which has already been byte swapped
 * (if necessary).
 */

bool write_primary_superblock(PEXT2_FILESYS Ext2Sys, PEXT2_SUPER_BLOCK super)
{
    bool bRet;

    bRet = NT_SUCCESS(Ext2WriteDisk(
                           Ext2Sys,
                           ((LONGLONG)SUPERBLOCK_OFFSET),
                           SUPERBLOCK_SIZE, (PUCHAR)super));


    return bRet;
}


/*
 * Updates the revision to EXT2_DYNAMIC_REV
 */
void ext2_update_dynamic_rev(PEXT2_FILESYS fs)
{
    PEXT2_SUPER_BLOCK sb = fs->ext2_sb;

    if (sb->s_rev_level > EXT2_GOOD_OLD_REV)
        return;

    sb->s_rev_level = EXT2_DYNAMIC_REV;
    sb->s_first_ino = EXT2_GOOD_OLD_FIRST_INO;
    sb->s_inode_size = EXT2_GOOD_OLD_INODE_SIZE;
    /* s_uuid is handled by e2fsck already */
    /* other fields should be left alone */
}


bool ext2_flush(PEXT2_FILESYS fs)
{
    ULONG       i,j,maxgroup,sgrp;
    ULONG       group_block;
    bool        retval;
    char        *group_ptr;
    unsigned long fs_state;
    PEXT2_SUPER_BLOCK super_shadow = 0;
    PEXT2_GROUP_DESC group_shadow = 0;

    LARGE_INTEGER   SysTime;

    NtQuerySystemTime(&SysTime);

    fs_state = fs->ext2_sb->s_state;

    RtlTimeToSecondsSince1970(&SysTime, &fs->ext2_sb->s_wtime);
    fs->ext2_sb->s_block_group_nr = 0;

    super_shadow = fs->ext2_sb;
    group_shadow = fs->group_desc;

    /*
     * Write out master superblock.  This has to be done
     * separately, since it is located at a fixed location
     * (SUPERBLOCK_OFFSET).
     */
    retval = write_primary_superblock(fs, super_shadow);
    if (!retval)
        goto errout;

    /*
     * If this is an external journal device, don't write out the
     * block group descriptors or any of the backup superblocks
     */
    if (fs->ext2_sb->s_feature_incompat &
        EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)
    {
        retval = false;
        goto errout;
    }

    /*
     * Set the state of the FS to be non-valid.  (The state has
     * already been backed up earlier, and will be restored when
     * we exit.)
     */
    fs->ext2_sb->s_state &= ~EXT2_VALID_FS;

    /*
     * Write out the master group descriptors, and the backup
     * superblocks and group descriptors.
     */
    group_block = fs->ext2_sb->s_first_data_block;
    maxgroup = fs->group_desc_count;

    for (i = 0; i < maxgroup; i++)
    {
        if (!ext2_bg_has_super(fs->ext2_sb, i))
            goto next_group;

        sgrp = i;
        if (sgrp > ((1 << 16) - 1))
            sgrp = (1 << 16) - 1;

        fs->ext2_sb->s_block_group_nr = (USHORT) sgrp;

        if (i !=0 )
        {
            retval = NT_SUCCESS(Ext2WriteDisk(
                                fs,
                                ((ULONGLONG)group_block * fs->blocksize),
                                SUPERBLOCK_SIZE, (PUCHAR)super_shadow));

            if (!retval)
            {
                goto errout;
            }
        }

        group_ptr = (char *) group_shadow;

        for (j=0; j < fs->desc_blocks; j++)
        {

            retval = NT_SUCCESS(Ext2WriteDisk(
                                fs,
                                ((ULONGLONG)(group_block+1+j) * fs->blocksize),
                                fs->blocksize, (PUCHAR) group_ptr));

            if (!retval)
            {
                goto errout;
            }

            group_ptr += fs->blocksize;
        }

    next_group:
        group_block += EXT2_BLOCKS_PER_GROUP(fs->ext2_sb);

    }

    fs->ext2_sb->s_block_group_nr = 0;

    /*
     * If the write_bitmaps() function is present, call it to
     * flush the bitmaps.  This is done this way so that a simple
     * program that doesn't mess with the bitmaps doesn't need to
     * drag in the bitmaps.c code.
     */
    retval = ext2_write_bitmaps(fs);
    if (!retval)
        goto errout;

    /*
     * Flush the blocks out to disk
     */

    // retval = io_channel_flush(fs->io);

errout:

    fs->ext2_sb->s_state = (USHORT) fs_state;

    return retval;
}


bool create_journal_dev(PEXT2_FILESYS fs)
{
    bool        retval = false;
    char        *buf = NULL;
    ULONG       blk;
    ULONG       count;

    if (!retval)
    {
        DPRINT1("Mke2fs: ext2_create_journal_dev: while initializing journal superblock.\n");
        return false;
    }

    DPRINT("Mke2fs: Zeroing journal device: \n");

    retval = zero_blocks(fs, 0, fs->ext2_sb->s_blocks_count,
                 &blk, &count);

    zero_blocks(0, 0, 0, 0, 0);

    if (!retval)
    {
        DPRINT1("Mke2fs: create_journal_dev: while zeroing journal device (block %lu, count %lu).\n",
            blk, count);
        return false;
    }

    retval = NT_SUCCESS(Ext2WriteDisk(
                    fs,
                    ((ULONGLONG)blk * (fs->ext2_sb->s_first_data_block+1)),
                    fs->blocksize, (unsigned char *)buf));

    if (!retval)
    {
        DPRINT1("Mke2fs: create_journal_dev: while writing journal superblock.\n");
        return false;
    }

    return true;
}

#define BLOCK_BITS (Ext2Sys->ext2_sb->s_log_block_size + 10)

ULONG
Ext2DataBlocks(PEXT2_FILESYS Ext2Sys, ULONG TotalBlocks)
{
    ULONG   dwData[4] = {1, 1, 1, 1};
    ULONG   dwMeta[4] = {0, 0, 0, 0};
    ULONG   DataBlocks = 0;
    ULONG   i, j;

    if (TotalBlocks <= EXT2_NDIR_BLOCKS)
    {
        return TotalBlocks;
    }

    TotalBlocks -= EXT2_NDIR_BLOCKS;

    for (i = 0; i < 4; i++)
    {
        dwData[i] = dwData[i] << ((BLOCK_BITS - 2) * i);

        if (i > 0)
        {
            dwMeta[i] = 1 + (dwMeta[i - 1] << (BLOCK_BITS - 2));
        }
    }

    for( i=1; (i < 4) && (TotalBlocks > 0); i++)
    {
        if (TotalBlocks >= (dwData[i] + dwMeta[i]))
        {
            TotalBlocks -= (dwData[i] + dwMeta[i]);
            DataBlocks  += dwData[i];
        }
        else
        {
            ULONG   dwDivide = 0;
            ULONG   dwRemain = 0;

            for (j=i; (j > 0) && (TotalBlocks > 0); j--)
            {
                dwDivide = (TotalBlocks - 1) / (dwData[j-1] + dwMeta[j-1]);
                dwRemain = (TotalBlocks - 1) % (dwData[j-1] + dwMeta[j-1]);

                DataBlocks += (dwDivide * dwData[j-1]);
                TotalBlocks = dwRemain;
            }
        }
    }

    return (DataBlocks + EXT2_NDIR_BLOCKS);
}


ULONG
Ext2TotalBlocks(PEXT2_FILESYS Ext2Sys, ULONG DataBlocks)
{
    ULONG   dwData[4] = {1, 1, 1, 1};
    ULONG   dwMeta[4] = {0, 0, 0, 0};
    ULONG   TotalBlocks = 0;
    ULONG   i, j;

    if (DataBlocks <= EXT2_NDIR_BLOCKS)
    {
        return DataBlocks;
    }

    DataBlocks -= EXT2_NDIR_BLOCKS;

    for (i = 0; i < 4; i++)
    {
        dwData[i] = dwData[i] << ((BLOCK_BITS - 2) * i);

        if (i > 0)
        {
            dwMeta[i] = 1 + (dwMeta[i - 1] << (BLOCK_BITS - 2));
        }
    }

    for( i=1; (i < 4) && (DataBlocks > 0); i++)
    {
        if (DataBlocks >= dwData[i])
        {
            DataBlocks  -= dwData[i];
            TotalBlocks += (dwData[i] + dwMeta[i]);
        }
        else
        {
            ULONG   dwDivide = 0;
            ULONG   dwRemain = 0;

            for (j=i; (j > 0) && (DataBlocks > 0); j--)
            {
                dwDivide = (DataBlocks) / (dwData[j-1]);
                dwRemain = (DataBlocks) % (dwData[j-1]);

                TotalBlocks += (dwDivide * (dwData[j-1] + dwMeta[j-1]) + 1);
                DataBlocks = dwRemain;
            }
        }
    }

    return (TotalBlocks + EXT2_NDIR_BLOCKS);
}


BOOLEAN
NTAPI
Ext2Format(
    IN PUNICODE_STRING DriveRoot,
    IN PFMIFSCALLBACK Callback,
    IN BOOLEAN QuickFormat,
    IN BOOLEAN BackwardCompatible,
    IN MEDIA_TYPE MediaType,
    IN PUNICODE_STRING Label,
    IN ULONG ClusterSize)
{
    BOOLEAN    bRet;
    NTSTATUS   Status = STATUS_UNSUCCESSFUL;
    /* Super Block: 1024 bytes long */
    EXT2_SUPER_BLOCK Ext2Sb;
    /* File Sys Structure */
    EXT2_FILESYS     FileSys;
    ULONG Percent;
    ULONG rsv;
    ULONG blocks;
    ULONG start;
    ULONG ret_blk;

    // FIXME:
    UNREFERENCED_PARAMETER(BackwardCompatible);
    UNREFERENCED_PARAMETER(MediaType);

    if (Callback != NULL)
    {
        Callback(PROGRESS, 0, (PVOID)&Percent);
    }


    RtlZeroMemory(&Ext2Sb, sizeof(EXT2_SUPER_BLOCK));
    RtlZeroMemory(&FileSys, sizeof(EXT2_FILESYS));
    FileSys.ext2_sb = &Ext2Sb;


    if (!NT_SUCCESS(Ext2OpenDevice(&FileSys, DriveRoot)))
    {
        DPRINT1("Mke2fs: Volume %wZ does not exist, ...\n", DriveRoot);
        goto clean_up;
    }


    if (!NT_SUCCESS(Ext2GetMediaInfo(&FileSys)))
    {
        DPRINT1("Mke2fs: Can't get media information\n");
        goto clean_up;
    }

    set_fs_defaults(NULL, &Ext2Sb, ClusterSize, &inode_ratio);

    Ext2Sb.s_blocks_count = FileSys.PartInfo.PartitionLength.QuadPart /
                            EXT2_BLOCK_SIZE(&Ext2Sb);


    /*
     * Calculate number of inodes based on the inode ratio
     */
    Ext2Sb.s_inodes_count =
        (ULONG)(((LONGLONG) Ext2Sb.s_blocks_count * EXT2_BLOCK_SIZE(&Ext2Sb)) / inode_ratio);

    /*
     * Calculate number of blocks to reserve
     */
    Ext2Sb.s_r_blocks_count = (Ext2Sb.s_blocks_count * 5) / 100;


    Status = Ext2LockVolume(&FileSys);
    if (NT_SUCCESS(Status))
    {
        bLocked = TRUE;
    }

    Status = STATUS_UNSUCCESSFUL;

    // Initialize
    if (!ext2_initialize_sb(&FileSys))
    {
        DPRINT1("Mke2fs: error...\n");
        goto clean_up;
    }


    zap_sector(&FileSys, 2, 6);

    /*
     * Generate a UUID for it...
     */
    {
        __u8  uuid[16];
        uuid_generate(&uuid[0]);
        memcpy(&Ext2Sb.s_uuid[0], &uuid[0], 16);
    }

    /*
     * 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.
     */
    {
        ULONG i, val;

        for (i = 0, val = 0 ; i < sizeof(Ext2Sb.s_uuid); i++)
            val += Ext2Sb.s_uuid[i];

        Ext2Sb.s_max_mnt_count += val % EXT2_DFL_MAX_MNT_COUNT;
    }

    /*
     * Set the volume label...
     */
    if (Label)
    {
        ANSI_STRING ansi_label;
        ansi_label.MaximumLength = sizeof(Ext2Sb.s_volume_name);
        ansi_label.Length = 0;
        ansi_label.Buffer = Ext2Sb.s_volume_name;
        RtlUnicodeStringToAnsiString(&ansi_label, Label, FALSE);
    }

    ext2_print_super(&Ext2Sb);

    bRet = ext2_allocate_tables(&FileSys);
    if (!bRet)
    {
        goto clean_up;
    }

    /* rsv must be a power of two (64kB is MD RAID sb alignment) */
    rsv = 65536 / FileSys.blocksize;
    blocks = Ext2Sb.s_blocks_count;

#ifdef ZAP_BOOTBLOCK
    DPRINT1("Mke2fs: zeroing volume boot record\n");
    zap_sector(&FileSys, 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;

    bRet = TRUE;
    if (start > 0)
        bRet = zero_blocks(&FileSys, start, blocks - start, &ret_blk, NULL);

    if (!bRet)
    {
        DPRINT1("Mke2fs: zeroing block %lu at end of filesystem", ret_blk);
        goto clean_up;
    }

    write_inode_tables(&FileSys);

    create_root_dir(&FileSys);
    create_lost_and_found(&FileSys);

    ext2_reserve_inodes(&FileSys);

    create_bad_block_inode(&FileSys, NULL);

    DPRINT("Mke2fs: Writing superblocks and filesystem accounting information ... \n");

    if (!QuickFormat)
    {
        DPRINT1("Mke2fs: Slow format not supported yet\n");
    }

    if (!ext2_flush(&FileSys))
    {
        DPRINT1("Mke2fs: Warning, had trouble writing out superblocks.\n");
        goto clean_up;
    }

    DPRINT("Mke2fs: Writing superblocks and filesystem accounting information done!\n");

    Status = STATUS_SUCCESS;

clean_up:

    // Clean up ...
    ext2_free_group_desc(&FileSys);

    ext2_free_block_bitmap(&FileSys);
    ext2_free_inode_bitmap(&FileSys);

    if(bLocked)
    {
        Ext2DisMountVolume(&FileSys);
        Ext2UnLockVolume(&FileSys);
    }

    Ext2CloseDevice(&FileSys);

    return NT_SUCCESS(Status);
}

BOOLEAN
NTAPI
Ext2Chkdsk(
    IN PUNICODE_STRING DriveRoot,
    IN PFMIFSCALLBACK Callback,
    IN BOOLEAN FixErrors,
    IN BOOLEAN Verbose,
    IN BOOLEAN CheckOnlyIfDirty,
    IN BOOLEAN ScanDrive,
    IN PVOID pUnknown1,
    IN PVOID pUnknown2,
    IN PVOID pUnknown3,
    IN PVOID pUnknown4,
    IN PULONG ExitStatus)
{
    UNIMPLEMENTED;
    *ExitStatus = (ULONG)STATUS_SUCCESS;
    return TRUE;
}