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[tools/e2fsprogs.git] / lib / ext2fs / bitmaps.c
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 Library
9  * General Public License, version 2.
10  * %End-Header%
11  */
12
13 #include "config.h"
14 #include <stdio.h>
15 #include <string.h>
16 #if HAVE_UNISTD_H
17 #include <unistd.h>
18 #endif
19 #include <fcntl.h>
20 #include <time.h>
21 #if HAVE_SYS_STAT_H
22 #include <sys/stat.h>
23 #endif
24 #if HAVE_SYS_TYPES_H
25 #include <sys/types.h>
26 #endif
27
28 #include "ext2_fs.h"
29 #include "ext2fs.h"
30 #include "ext2fsP.h"
31 #include "bmap64.h"
32
33 void ext2fs_free_inode_bitmap(ext2fs_inode_bitmap bitmap)
34 {
35         ext2fs_free_generic_bmap(bitmap);
36 }
37
38 void ext2fs_free_block_bitmap(ext2fs_block_bitmap bitmap)
39 {
40         ext2fs_free_generic_bmap(bitmap);
41 }
42
43 errcode_t ext2fs_copy_bitmap(ext2fs_generic_bitmap src,
44                              ext2fs_generic_bitmap *dest)
45 {
46         return (ext2fs_copy_generic_bmap(src, dest));
47 }
48 void ext2fs_set_bitmap_padding(ext2fs_generic_bitmap map)
49 {
50         ext2fs_set_generic_bmap_padding(map);
51 }
52
53 errcode_t ext2fs_allocate_inode_bitmap(ext2_filsys fs,
54                                        const char *descr,
55                                        ext2fs_inode_bitmap *ret)
56 {
57         __u64           start, end, real_end;
58
59         EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
60
61         if (ext2fs_has_feature_journal_dev(fs->super))
62                 return EXT2_ET_EXTERNAL_JOURNAL_NOSUPP;
63
64         fs->write_bitmaps = ext2fs_write_bitmaps;
65
66         start = 1;
67         end = fs->super->s_inodes_count;
68         real_end = (__u64)EXT2_INODES_PER_GROUP(fs->super) *
69                 fs->group_desc_count;
70
71         /* Are we permitted to use new-style bitmaps? */
72         if (fs->flags & EXT2_FLAG_64BITS)
73                 return (ext2fs_alloc_generic_bmap(fs,
74                                 EXT2_ET_MAGIC_INODE_BITMAP64,
75                                 fs->default_bitmap_type,
76                                 start, end, real_end, descr, ret));
77
78         /* Otherwise, check to see if the file system is small enough
79          * to use old-style 32-bit bitmaps */
80         if ((end > ~0U) || (real_end > ~0U))
81                 return EXT2_ET_CANT_USE_LEGACY_BITMAPS;
82
83         return (ext2fs_make_generic_bitmap(EXT2_ET_MAGIC_INODE_BITMAP, fs,
84                                          start, end, real_end,
85                                          descr, 0,
86                                          (ext2fs_generic_bitmap *) ret));
87 }
88
89 errcode_t ext2fs_allocate_block_bitmap(ext2_filsys fs,
90                                        const char *descr,
91                                        ext2fs_block_bitmap *ret)
92 {
93         __u64           start, end, real_end;
94
95         EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
96
97         if (ext2fs_has_feature_journal_dev(fs->super))
98                 return EXT2_ET_EXTERNAL_JOURNAL_NOSUPP;
99
100         fs->write_bitmaps = ext2fs_write_bitmaps;
101
102         start = EXT2FS_B2C(fs, fs->super->s_first_data_block);
103         end = EXT2FS_B2C(fs, ext2fs_blocks_count(fs->super)-1);
104         real_end = ((__u64) EXT2_CLUSTERS_PER_GROUP(fs->super)
105                     * (__u64) fs->group_desc_count)-1 + start;
106
107         if (fs->flags & EXT2_FLAG_64BITS)
108                 return (ext2fs_alloc_generic_bmap(fs,
109                                 EXT2_ET_MAGIC_BLOCK_BITMAP64,
110                                 fs->default_bitmap_type,
111                                 start, end, real_end, descr, ret));
112
113         if ((end > ~0U) || (real_end > ~0U))
114                 return EXT2_ET_CANT_USE_LEGACY_BITMAPS;
115
116         return (ext2fs_make_generic_bitmap(EXT2_ET_MAGIC_BLOCK_BITMAP, fs,
117                                            start, end, real_end,
118                                            descr, 0,
119                                            (ext2fs_generic_bitmap *) ret));
120 }
121
122 /*
123  * ext2fs_allocate_block_bitmap() really allocates a per-cluster
124  * bitmap for backwards compatibility.  This function allocates a
125  * block bitmap which is truly per-block, even if clusters/bigalloc
126  * are enabled.  mke2fs and e2fsck need this for tracking the
127  * allocation of the file system metadata blocks.
128  */
129 errcode_t ext2fs_allocate_subcluster_bitmap(ext2_filsys fs,
130                                             const char *descr,
131                                             ext2fs_block_bitmap *ret)
132 {
133         __u64                   start, end, real_end;
134         ext2fs_generic_bitmap   bmap;
135         ext2fs_generic_bitmap_64 bmap64;
136         errcode_t               retval;
137
138         EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
139
140         if (ext2fs_has_feature_journal_dev(fs->super))
141                 return EXT2_ET_EXTERNAL_JOURNAL_NOSUPP;
142
143         fs->write_bitmaps = ext2fs_write_bitmaps;
144
145         if (!fs->cluster_ratio_bits)
146                 return ext2fs_allocate_block_bitmap(fs, descr, ret);
147
148         if ((fs->flags & EXT2_FLAG_64BITS) == 0)
149                 return EXT2_ET_CANT_USE_LEGACY_BITMAPS;
150
151         start = fs->super->s_first_data_block;
152         end = ext2fs_blocks_count(fs->super)-1;
153         real_end = ((__u64) EXT2_BLOCKS_PER_GROUP(fs->super)
154                     * (__u64) fs->group_desc_count)-1 + start;
155
156         retval = ext2fs_alloc_generic_bmap(fs, EXT2_ET_MAGIC_BLOCK_BITMAP64,
157                                            fs->default_bitmap_type, start,
158                                            end, real_end, descr, &bmap);
159         if (retval)
160                 return retval;
161         bmap64 = (ext2fs_generic_bitmap_64) bmap;
162         bmap64->cluster_bits = 0;
163         *ret = bmap;
164         return 0;
165 }
166
167 int ext2fs_get_bitmap_granularity(ext2fs_block_bitmap bitmap)
168 {
169         ext2fs_generic_bitmap_64 bmap = (ext2fs_generic_bitmap_64) bitmap;
170
171         if (!EXT2FS_IS_64_BITMAP(bmap))
172                 return 0;
173
174         return bmap->cluster_bits;
175 }
176
177 errcode_t ext2fs_fudge_inode_bitmap_end(ext2fs_inode_bitmap bitmap,
178                                         ext2_ino_t end, ext2_ino_t *oend)
179 {
180         __u64 tmp_oend;
181         int retval;
182
183         retval = ext2fs_fudge_generic_bmap_end((ext2fs_generic_bitmap) bitmap,
184                                                EXT2_ET_FUDGE_INODE_BITMAP_END,
185                                                end, &tmp_oend);
186         if (oend)
187                 *oend = tmp_oend;
188         return retval;
189 }
190
191 errcode_t ext2fs_fudge_block_bitmap_end(ext2fs_block_bitmap bitmap,
192                                         blk_t end, blk_t *oend)
193 {
194         return (ext2fs_fudge_generic_bitmap_end(bitmap,
195                                                 EXT2_ET_MAGIC_BLOCK_BITMAP,
196                                                 EXT2_ET_FUDGE_BLOCK_BITMAP_END,
197                                                 end, oend));
198 }
199
200 errcode_t ext2fs_fudge_block_bitmap_end2(ext2fs_block_bitmap bitmap,
201                                          blk64_t end, blk64_t *oend)
202 {
203         return (ext2fs_fudge_generic_bmap_end(bitmap,
204                                               EXT2_ET_FUDGE_BLOCK_BITMAP_END,
205                                               end, oend));
206 }
207
208 void ext2fs_clear_inode_bitmap(ext2fs_inode_bitmap bitmap)
209 {
210         ext2fs_clear_generic_bmap(bitmap);
211 }
212
213 void ext2fs_clear_block_bitmap(ext2fs_block_bitmap bitmap)
214 {
215         ext2fs_clear_generic_bmap(bitmap);
216 }
217
218 errcode_t ext2fs_resize_inode_bitmap(__u32 new_end, __u32 new_real_end,
219                                      ext2fs_inode_bitmap bmap)
220 {
221         return (ext2fs_resize_generic_bitmap(EXT2_ET_MAGIC_INODE_BITMAP,
222                                              new_end, new_real_end, bmap));
223 }
224
225 errcode_t ext2fs_resize_inode_bitmap2(__u64 new_end, __u64 new_real_end,
226                                       ext2fs_inode_bitmap bmap)
227 {
228         return (ext2fs_resize_generic_bmap(bmap, new_end, new_real_end));
229 }
230
231 errcode_t ext2fs_resize_block_bitmap(__u32 new_end, __u32 new_real_end,
232                                      ext2fs_block_bitmap bmap)
233 {
234         return (ext2fs_resize_generic_bitmap(EXT2_ET_MAGIC_BLOCK_BITMAP,
235                                              new_end, new_real_end, bmap));
236 }
237
238 errcode_t ext2fs_resize_block_bitmap2(__u64 new_end, __u64 new_real_end,
239                                       ext2fs_block_bitmap bmap)
240 {
241         return (ext2fs_resize_generic_bmap(bmap, new_end, new_real_end));
242 }
243
244 errcode_t ext2fs_compare_block_bitmap(ext2fs_block_bitmap bm1,
245                                       ext2fs_block_bitmap bm2)
246 {
247         return (ext2fs_compare_generic_bmap(EXT2_ET_NEQ_BLOCK_BITMAP,
248                                             bm1, bm2));
249 }
250
251 errcode_t ext2fs_compare_inode_bitmap(ext2fs_inode_bitmap bm1,
252                                       ext2fs_inode_bitmap bm2)
253 {
254         return (ext2fs_compare_generic_bmap(EXT2_ET_NEQ_INODE_BITMAP,
255                                             bm1, bm2));
256 }
257
258 errcode_t ext2fs_set_inode_bitmap_range(ext2fs_inode_bitmap bmap,
259                                         ext2_ino_t start, unsigned int num,
260                                         void *in)
261 {
262         return (ext2fs_set_generic_bitmap_range(bmap,
263                                                 EXT2_ET_MAGIC_INODE_BITMAP,
264                                                 start, num, in));
265 }
266
267 errcode_t ext2fs_set_inode_bitmap_range2(ext2fs_inode_bitmap bmap,
268                                          __u64 start, size_t num,
269                                          void *in)
270 {
271         return (ext2fs_set_generic_bmap_range(bmap, start, num, in));
272 }
273
274 errcode_t ext2fs_get_inode_bitmap_range(ext2fs_inode_bitmap bmap,
275                                         ext2_ino_t start, unsigned int num,
276                                         void *out)
277 {
278         return (ext2fs_get_generic_bitmap_range(bmap,
279                                                 EXT2_ET_MAGIC_INODE_BITMAP,
280                                                 start, num, out));
281 }
282
283 errcode_t ext2fs_get_inode_bitmap_range2(ext2fs_inode_bitmap bmap,
284                                          __u64 start, size_t num,
285                                          void *out)
286 {
287         return (ext2fs_get_generic_bmap_range(bmap, start, num, out));
288 }
289
290 errcode_t ext2fs_set_block_bitmap_range(ext2fs_block_bitmap bmap,
291                                         blk_t start, unsigned int num,
292                                         void *in)
293 {
294         return (ext2fs_set_generic_bitmap_range(bmap,
295                                                 EXT2_ET_MAGIC_BLOCK_BITMAP,
296                                                 start, num, in));
297 }
298
299 errcode_t ext2fs_set_block_bitmap_range2(ext2fs_block_bitmap bmap,
300                                          blk64_t start, size_t num,
301                                          void *in)
302 {
303         return (ext2fs_set_generic_bmap_range(bmap, start, num, in));
304 }
305
306 errcode_t ext2fs_get_block_bitmap_range(ext2fs_block_bitmap bmap,
307                                         blk_t start, unsigned int num,
308                                         void *out)
309 {
310         return (ext2fs_get_generic_bitmap_range(bmap,
311                                                 EXT2_ET_MAGIC_BLOCK_BITMAP,
312                                                 start, num, out));
313 }
314
315 errcode_t ext2fs_get_block_bitmap_range2(ext2fs_block_bitmap bmap,
316                                          blk64_t start, size_t num,
317                                          void *out)
318 {
319         return (ext2fs_get_generic_bmap_range(bmap, start, num, out));
320 }