busybox

/* vi: set sw=4 ts=4: */

/*

 * rs_bitmap.c --- routine for changing the size of a bitmap

 *

 * Copyright (C) 1996, 1997 Theodore Ts'o.

 *

 * %Begin-Header%

 * This file may be redistributed under the terms of the GNU Public

 * License.

 * %End-Header%

 */

​

#include <stdio.h>

#include <string.h>

#if HAVE_UNISTD_H

#include <unistd.h>

#endif

#include <fcntl.h>

#include <time.h>

#ifdef HAVE_SYS_STAT_H

#include <sys/stat.h>

#endif

#ifdef HAVE_SYS_TYPES_H

#include <sys/types.h>

#endif

​

#include "ext2_fs.h"

#include "ext2fs.h"

​

errcode_t ext2fs_resize_generic_bitmap(__u32 new_end, __u32 new_real_end,

                       ext2fs_generic_bitmap bmap)

{

    errcode_t   retval;

    size_t      size, new_size;

    __u32       bitno;

​

    if (!bmap)

        return EXT2_ET_INVALID_ARGUMENT;

​

    EXT2_CHECK_MAGIC(bmap, EXT2_ET_MAGIC_GENERIC_BITMAP);

​

    /*

     * If we're expanding the bitmap, make sure all of the new

     * parts of the bitmap are zero.

     */

    if (new_end > bmap->end) {

        bitno = bmap->real_end;

        if (bitno > new_end)

            bitno = new_end;

        for (; bitno > bmap->end; bitno--)

            ext2fs_clear_bit(bitno - bmap->start, bmap->bitmap);

    }

    if (new_real_end == bmap->real_end) {

        bmap->end = new_end;

        return 0;

    }

​

    size = ((bmap->real_end - bmap->start) / 8) + 1;

    new_size = ((new_real_end - bmap->start) / 8) + 1;

​

    if (size != new_size) {

        retval = ext2fs_resize_mem(size, new_size, &bmap->bitmap);

        if (retval)

            return retval;

    }

    if (new_size > size)

        memset(bmap->bitmap + size, 0, new_size - size);

​

    bmap->end = new_end;

    bmap->real_end = new_real_end;

    return 0;

}

​

errcode_t ext2fs_resize_inode_bitmap(__u32 new_end, __u32 new_real_end,

                     ext2fs_inode_bitmap bmap)

{

    errcode_t   retval;

​

    if (!bmap)

        return EXT2_ET_INVALID_ARGUMENT;

​

    EXT2_CHECK_MAGIC(bmap, EXT2_ET_MAGIC_INODE_BITMAP);

​

    bmap->magic = EXT2_ET_MAGIC_GENERIC_BITMAP;

    retval = ext2fs_resize_generic_bitmap(new_end, new_real_end,

                          bmap);

    bmap->magic = EXT2_ET_MAGIC_INODE_BITMAP;

    return retval;

}

​

errcode_t ext2fs_resize_block_bitmap(__u32 new_end, __u32 new_real_end,

                     ext2fs_block_bitmap bmap)