1 | /*
|
---|
2 | * bitmaps.c --- routines to read, write, and manipulate the inode and
|
---|
3 | * block bitmaps.
|
---|
4 | *
|
---|
5 | * Copyright (C) 1993, 1994, 1995, 1996 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 | #if HAVE_SYS_STAT_H
|
---|
21 | #include <sys/stat.h>
|
---|
22 | #endif
|
---|
23 | #if HAVE_SYS_TYPES_H
|
---|
24 | #include <sys/types.h>
|
---|
25 | #endif
|
---|
26 |
|
---|
27 | #include "ext2_fs.h"
|
---|
28 | #include "ext2fs.h"
|
---|
29 |
|
---|
30 | static errcode_t make_bitmap(__u32 start, __u32 end, __u32 real_end,
|
---|
31 | const char *descr, char *init_map,
|
---|
32 | ext2fs_generic_bitmap *ret)
|
---|
33 | {
|
---|
34 | ext2fs_generic_bitmap bitmap;
|
---|
35 | errcode_t retval;
|
---|
36 | size_t size;
|
---|
37 |
|
---|
38 | retval = ext2fs_get_mem(sizeof(struct ext2fs_struct_generic_bitmap),
|
---|
39 | &bitmap);
|
---|
40 | if (retval)
|
---|
41 | return retval;
|
---|
42 |
|
---|
43 | bitmap->magic = EXT2_ET_MAGIC_GENERIC_BITMAP;
|
---|
44 | bitmap->fs = NULL;
|
---|
45 | bitmap->start = start;
|
---|
46 | bitmap->end = end;
|
---|
47 | bitmap->real_end = real_end;
|
---|
48 | bitmap->base_error_code = EXT2_ET_BAD_GENERIC_MARK;
|
---|
49 | if (descr) {
|
---|
50 | retval = ext2fs_get_mem(strlen(descr)+1, &bitmap->description);
|
---|
51 | if (retval) {
|
---|
52 | ext2fs_free_mem(&bitmap);
|
---|
53 | return retval;
|
---|
54 | }
|
---|
55 | strcpy(bitmap->description, descr);
|
---|
56 | } else
|
---|
57 | bitmap->description = 0;
|
---|
58 |
|
---|
59 | size = (size_t) (((bitmap->real_end - bitmap->start) / 8) + 1);
|
---|
60 | retval = ext2fs_get_mem(size, &bitmap->bitmap);
|
---|
61 | if (retval) {
|
---|
62 | ext2fs_free_mem(&bitmap->description);
|
---|
63 | ext2fs_free_mem(&bitmap);
|
---|
64 | return retval;
|
---|
65 | }
|
---|
66 |
|
---|
67 | if (init_map)
|
---|
68 | memcpy(bitmap->bitmap, init_map, size);
|
---|
69 | else
|
---|
70 | memset(bitmap->bitmap, 0, size);
|
---|
71 | *ret = bitmap;
|
---|
72 | return 0;
|
---|
73 | }
|
---|
74 |
|
---|
75 | errcode_t ext2fs_allocate_generic_bitmap(__u32 start,
|
---|
76 | __u32 end,
|
---|
77 | __u32 real_end,
|
---|
78 | const char *descr,
|
---|
79 | ext2fs_generic_bitmap *ret)
|
---|
80 | {
|
---|
81 | return make_bitmap(start, end, real_end, descr, 0, ret);
|
---|
82 | }
|
---|
83 |
|
---|
84 | errcode_t ext2fs_copy_bitmap(ext2fs_generic_bitmap src,
|
---|
85 | ext2fs_generic_bitmap *dest)
|
---|
86 | {
|
---|
87 | errcode_t retval;
|
---|
88 | ext2fs_generic_bitmap new_map;
|
---|
89 |
|
---|
90 | retval = make_bitmap(src->start, src->end, src->real_end,
|
---|
91 | src->description, src->bitmap, &new_map);
|
---|
92 | if (retval)
|
---|
93 | return retval;
|
---|
94 | new_map->magic = src->magic;
|
---|
95 | new_map->fs = src->fs;
|
---|
96 | new_map->base_error_code = src->base_error_code;
|
---|
97 | *dest = new_map;
|
---|
98 | return 0;
|
---|
99 | }
|
---|
100 |
|
---|
101 | void ext2fs_set_bitmap_padding(ext2fs_generic_bitmap map)
|
---|
102 | {
|
---|
103 | __u32 i, j;
|
---|
104 |
|
---|
105 | for (i=map->end+1, j = i - map->start; i <= map->real_end; i++, j++)
|
---|
106 | ext2fs_set_bit(j, map->bitmap);
|
---|
107 |
|
---|
108 | return;
|
---|
109 | }
|
---|
110 |
|
---|
111 | errcode_t ext2fs_allocate_inode_bitmap(ext2_filsys fs,
|
---|
112 | const char *descr,
|
---|
113 | ext2fs_inode_bitmap *ret)
|
---|
114 | {
|
---|
115 | ext2fs_inode_bitmap bitmap;
|
---|
116 | errcode_t retval;
|
---|
117 | __u32 start, end, real_end;
|
---|
118 |
|
---|
119 | EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
|
---|
120 |
|
---|
121 | fs->write_bitmaps = ext2fs_write_bitmaps;
|
---|
122 |
|
---|
123 | start = 1;
|
---|
124 | end = fs->super->s_inodes_count;
|
---|
125 | real_end = (EXT2_INODES_PER_GROUP(fs->super) * fs->group_desc_count);
|
---|
126 |
|
---|
127 | retval = ext2fs_allocate_generic_bitmap(start, end, real_end,
|
---|
128 | descr, &bitmap);
|
---|
129 | if (retval)
|
---|
130 | return retval;
|
---|
131 |
|
---|
132 | bitmap->magic = EXT2_ET_MAGIC_INODE_BITMAP;
|
---|
133 | bitmap->fs = fs;
|
---|
134 | bitmap->base_error_code = EXT2_ET_BAD_INODE_MARK;
|
---|
135 |
|
---|
136 | *ret = bitmap;
|
---|
137 | return 0;
|
---|
138 | }
|
---|
139 |
|
---|
140 | errcode_t ext2fs_allocate_block_bitmap(ext2_filsys fs,
|
---|
141 | const char *descr,
|
---|
142 | ext2fs_block_bitmap *ret)
|
---|
143 | {
|
---|
144 | ext2fs_block_bitmap bitmap;
|
---|
145 | errcode_t retval;
|
---|
146 | __u32 start, end, real_end;
|
---|
147 |
|
---|
148 | EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
|
---|
149 |
|
---|
150 | fs->write_bitmaps = ext2fs_write_bitmaps;
|
---|
151 |
|
---|
152 | start = fs->super->s_first_data_block;
|
---|
153 | end = fs->super->s_blocks_count-1;
|
---|
154 | real_end = (EXT2_BLOCKS_PER_GROUP(fs->super)
|
---|
155 | * fs->group_desc_count)-1 + start;
|
---|
156 |
|
---|
157 | retval = ext2fs_allocate_generic_bitmap(start, end, real_end,
|
---|
158 | descr, &bitmap);
|
---|
159 | if (retval)
|
---|
160 | return retval;
|
---|
161 |
|
---|
162 | bitmap->magic = EXT2_ET_MAGIC_BLOCK_BITMAP;
|
---|
163 | bitmap->fs = fs;
|
---|
164 | bitmap->base_error_code = EXT2_ET_BAD_BLOCK_MARK;
|
---|
165 |
|
---|
166 | *ret = bitmap;
|
---|
167 | return 0;
|
---|
168 | }
|
---|
169 |
|
---|
170 | errcode_t ext2fs_fudge_inode_bitmap_end(ext2fs_inode_bitmap bitmap,
|
---|
171 | ext2_ino_t end, ext2_ino_t *oend)
|
---|
172 | {
|
---|
173 | EXT2_CHECK_MAGIC(bitmap, EXT2_ET_MAGIC_INODE_BITMAP);
|
---|
174 |
|
---|
175 | if (end > bitmap->real_end)
|
---|
176 | return EXT2_ET_FUDGE_INODE_BITMAP_END;
|
---|
177 | if (oend)
|
---|
178 | *oend = bitmap->end;
|
---|
179 | bitmap->end = end;
|
---|
180 | return 0;
|
---|
181 | }
|
---|
182 |
|
---|
183 | errcode_t ext2fs_fudge_block_bitmap_end(ext2fs_block_bitmap bitmap,
|
---|
184 | blk_t end, blk_t *oend)
|
---|
185 | {
|
---|
186 | EXT2_CHECK_MAGIC(bitmap, EXT2_ET_MAGIC_BLOCK_BITMAP);
|
---|
187 |
|
---|
188 | if (end > bitmap->real_end)
|
---|
189 | return EXT2_ET_FUDGE_BLOCK_BITMAP_END;
|
---|
190 | if (oend)
|
---|
191 | *oend = bitmap->end;
|
---|
192 | bitmap->end = end;
|
---|
193 | return 0;
|
---|
194 | }
|
---|
195 |
|
---|
196 | void ext2fs_clear_inode_bitmap(ext2fs_inode_bitmap bitmap)
|
---|
197 | {
|
---|
198 | if (!bitmap || (bitmap->magic != EXT2_ET_MAGIC_INODE_BITMAP))
|
---|
199 | return;
|
---|
200 |
|
---|
201 | memset(bitmap->bitmap, 0,
|
---|
202 | (size_t) (((bitmap->real_end - bitmap->start) / 8) + 1));
|
---|
203 | }
|
---|
204 |
|
---|
205 | void ext2fs_clear_block_bitmap(ext2fs_block_bitmap bitmap)
|
---|
206 | {
|
---|
207 | if (!bitmap || (bitmap->magic != EXT2_ET_MAGIC_BLOCK_BITMAP))
|
---|
208 | return;
|
---|
209 |
|
---|
210 | memset(bitmap->bitmap, 0,
|
---|
211 | (size_t) (((bitmap->real_end - bitmap->start) / 8) + 1));
|
---|
212 | }
|
---|