1/*
2 * rs_bitmap.c --- routine for changing the size of a bitmap
3 *
4 * Copyright (C) 1996, 1997 Theodore Ts'o.
5 *
6 * %Begin-Header%
7 * This file may be redistributed under the terms of the GNU Public
8 * License.
9 * %End-Header%
10 */
11
12#include <stdio.h>
13#include <string.h>
14#if HAVE_UNISTD_H
15#include <unistd.h>
16#endif
17#include <fcntl.h>
18#include <time.h>
19#ifdef HAVE_SYS_STAT_H
20#include <sys/stat.h>
21#endif
22#ifdef HAVE_SYS_TYPES_H
23#include <sys/types.h>
24#endif
25
26#include "ext2_fs.h"
27#include "ext2fs.h"
28
29errcode_t ext2fs_resize_generic_bitmap(__u32 new_end, __u32 new_real_end,
30				       ext2fs_generic_bitmap bmap)
31{
32	errcode_t	retval;
33	size_t		size, new_size;
34	__u32		bitno;
35
36	if (!bmap)
37		return EXT2_ET_INVALID_ARGUMENT;
38
39	EXT2_CHECK_MAGIC(bmap, EXT2_ET_MAGIC_GENERIC_BITMAP);
40
41	/*
42	 * If we're expanding the bitmap, make sure all of the new
43	 * parts of the bitmap are zero.
44	 */
45	if (new_end > bmap->end) {
46		bitno = bmap->real_end;
47		if (bitno > new_end)
48			bitno = new_end;
49		for (; bitno > bmap->end; bitno--)
50			ext2fs_clear_bit(bitno - bmap->start, bmap->bitmap);
51	}
52	if (new_real_end == bmap->real_end) {
53		bmap->end = new_end;
54		return 0;
55	}
56
57	size = ((bmap->real_end - bmap->start) / 8) + 1;
58	new_size = ((new_real_end - bmap->start) / 8) + 1;
59
60	if (size != new_size) {
61		retval = ext2fs_resize_mem(size, new_size, &bmap->bitmap);
62		if (retval)
63			return retval;
64	}
65	if (new_size > size)
66		memset(bmap->bitmap + size, 0, new_size - size);
67
68	bmap->end = new_end;
69	bmap->real_end = new_real_end;
70	return 0;
71}
72
73errcode_t ext2fs_resize_inode_bitmap(__u32 new_end, __u32 new_real_end,
74				     ext2fs_inode_bitmap bmap)
75{
76	errcode_t	retval;
77
78	if (!bmap)
79		return EXT2_ET_INVALID_ARGUMENT;
80
81	EXT2_CHECK_MAGIC(bmap, EXT2_ET_MAGIC_INODE_BITMAP);
82
83	bmap->magic = EXT2_ET_MAGIC_GENERIC_BITMAP;
84	retval = ext2fs_resize_generic_bitmap(new_end, new_real_end,
85					      bmap);
86	bmap->magic = EXT2_ET_MAGIC_INODE_BITMAP;
87	return retval;
88}
89
90errcode_t ext2fs_resize_block_bitmap(__u32 new_end, __u32 new_real_end,
91				     ext2fs_block_bitmap bmap)
92{
93	errcode_t	retval;
94
95	if (!bmap)
96		return EXT2_ET_INVALID_ARGUMENT;
97
98	EXT2_CHECK_MAGIC(bmap, EXT2_ET_MAGIC_BLOCK_BITMAP);
99
100	bmap->magic = EXT2_ET_MAGIC_GENERIC_BITMAP;
101	retval = ext2fs_resize_generic_bitmap(new_end, new_real_end,
102					      bmap);
103	bmap->magic = EXT2_ET_MAGIC_BLOCK_BITMAP;
104	return retval;
105}
106
107