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