source: branches/stable/mindi-busybox/e2fsprogs/ext2fs/rs_bitmap.c @ 821

Last change on this file since 821 was 821, checked in by Bruno Cornec, 14 years ago

Addition of busybox 1.2.1 as a mindi-busybox new package
This should avoid delivering binary files in mindi not built there (Fedora and Debian are quite serious about that)

File size: 2.3 KB
RevLine 
[821]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
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