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
ext2fs_resize_generic_bitmap(__u32 new_end,__u32 new_real_end,ext2fs_generic_bitmap bmap)29 errcode_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
ext2fs_resize_inode_bitmap(__u32 new_end,__u32 new_real_end,ext2fs_inode_bitmap bmap)73 errcode_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
ext2fs_resize_block_bitmap(__u32 new_end,__u32 new_real_end,ext2fs_block_bitmap bmap)90 errcode_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