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/*
* 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,
(void **) &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)
{
errcode_t retval;
if (!bmap)
return EXT2_ET_INVALID_ARGUMENT;
EXT2_CHECK_MAGIC(bmap, EXT2_ET_MAGIC_BLOCK_BITMAP);
bmap->magic = EXT2_ET_MAGIC_GENERIC_BITMAP;
retval = ext2fs_resize_generic_bitmap(new_end, new_real_end,
bmap);
bmap->magic = EXT2_ET_MAGIC_BLOCK_BITMAP;
return retval;
}
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