blob: 32e87b77a9de41aa05d1e572eafa7fbfdb7ed631
1 | /* vi: set sw=4 ts=4: */ |
2 | /* |
3 | * rs_bitmap.c --- routine for changing the size of a bitmap |
4 | * |
5 | * Copyright (C) 1996, 1997 Theodore Ts'o. |
6 | * |
7 | * %Begin-Header% |
8 | * This file may be redistributed under the terms of the GNU Public |
9 | * License. |
10 | * %End-Header% |
11 | */ |
12 | |
13 | #include <stdio.h> |
14 | #include <string.h> |
15 | #if HAVE_UNISTD_H |
16 | #include <unistd.h> |
17 | #endif |
18 | #include <fcntl.h> |
19 | #include <time.h> |
20 | #ifdef HAVE_SYS_STAT_H |
21 | #include <sys/stat.h> |
22 | #endif |
23 | #ifdef HAVE_SYS_TYPES_H |
24 | #include <sys/types.h> |
25 | #endif |
26 | |
27 | #include "ext2_fs.h" |
28 | #include "ext2fs.h" |
29 | |
30 | errcode_t ext2fs_resize_generic_bitmap(__u32 new_end, __u32 new_real_end, |
31 | ext2fs_generic_bitmap bmap) |
32 | { |
33 | errcode_t retval; |
34 | size_t size, new_size; |
35 | __u32 bitno; |
36 | |
37 | if (!bmap) |
38 | return EXT2_ET_INVALID_ARGUMENT; |
39 | |
40 | EXT2_CHECK_MAGIC(bmap, EXT2_ET_MAGIC_GENERIC_BITMAP); |
41 | |
42 | /* |
43 | * If we're expanding the bitmap, make sure all of the new |
44 | * parts of the bitmap are zero. |
45 | */ |
46 | if (new_end > bmap->end) { |
47 | bitno = bmap->real_end; |
48 | if (bitno > new_end) |
49 | bitno = new_end; |
50 | for (; bitno > bmap->end; bitno--) |
51 | ext2fs_clear_bit(bitno - bmap->start, bmap->bitmap); |
52 | } |
53 | if (new_real_end == bmap->real_end) { |
54 | bmap->end = new_end; |
55 | return 0; |
56 | } |
57 | |
58 | size = ((bmap->real_end - bmap->start) / 8) + 1; |
59 | new_size = ((new_real_end - bmap->start) / 8) + 1; |
60 | |
61 | if (size != new_size) { |
62 | retval = ext2fs_resize_mem(size, new_size, &bmap->bitmap); |
63 | if (retval) |
64 | return retval; |
65 | } |
66 | if (new_size > size) |
67 | memset(bmap->bitmap + size, 0, new_size - size); |
68 | |
69 | bmap->end = new_end; |
70 | bmap->real_end = new_real_end; |
71 | return 0; |
72 | } |
73 | |
74 | errcode_t ext2fs_resize_inode_bitmap(__u32 new_end, __u32 new_real_end, |
75 | ext2fs_inode_bitmap bmap) |
76 | { |
77 | errcode_t retval; |
78 | |
79 | if (!bmap) |
80 | return EXT2_ET_INVALID_ARGUMENT; |
81 | |
82 | EXT2_CHECK_MAGIC(bmap, EXT2_ET_MAGIC_INODE_BITMAP); |
83 | |
84 | bmap->magic = EXT2_ET_MAGIC_GENERIC_BITMAP; |
85 | retval = ext2fs_resize_generic_bitmap(new_end, new_real_end, |
86 | bmap); |
87 | bmap->magic = EXT2_ET_MAGIC_INODE_BITMAP; |
88 | return retval; |
89 | } |
90 | |
91 | errcode_t ext2fs_resize_block_bitmap(__u32 new_end, __u32 new_real_end, |
92 | ext2fs_block_bitmap bmap) |
93 | { |
94 | errcode_t retval; |
95 | |
96 | if (!bmap) |
97 | return EXT2_ET_INVALID_ARGUMENT; |
98 | |
99 | EXT2_CHECK_MAGIC(bmap, EXT2_ET_MAGIC_BLOCK_BITMAP); |
100 | |
101 | bmap->magic = EXT2_ET_MAGIC_GENERIC_BITMAP; |
102 | retval = ext2fs_resize_generic_bitmap(new_end, new_real_end, |
103 | bmap); |
104 | bmap->magic = EXT2_ET_MAGIC_BLOCK_BITMAP; |
105 | return retval; |
106 | } |
107 |