mirror of
https://github.com/sheumann/hush.git
synced 2024-12-23 20:29:42 +00:00
108 lines
2.3 KiB
C
108 lines
2.3 KiB
C
/* 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)
|
|
{
|
|
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;
|
|
}
|
|
|