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 = (__u64)EXT2_INODES_PER_GROUP(fs->super) *
66 fs->group_desc_count;
67
68 /* Are we permitted to use new-style bitmaps? */
69 if (fs->flags & EXT2_FLAG_64BITS)
70 return (ext2fs_alloc_generic_bmap(fs,
71 EXT2_ET_MAGIC_INODE_BITMAP64,
72 fs->default_bitmap_type,
73 start, end, real_end, descr, ret));
74
75 /* Otherwise, check to see if the file system is small enough
76 * to use old-style 32-bit bitmaps */
77 if ((end > ~0U) || (real_end > ~0U))
78 return EXT2_ET_CANT_USE_LEGACY_BITMAPS;
79
80 return (ext2fs_make_generic_bitmap(EXT2_ET_MAGIC_INODE_BITMAP, fs,
81 start, end, real_end,
82 descr, 0,
83 (ext2fs_generic_bitmap *) ret));
84 }
85
ext2fs_allocate_block_bitmap(ext2_filsys fs,const char * descr,ext2fs_block_bitmap * ret)86 errcode_t ext2fs_allocate_block_bitmap(ext2_filsys fs,
87 const char *descr,
88 ext2fs_block_bitmap *ret)
89 {
90 __u64 start, end, real_end;
91
92 EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
93
94 fs->write_bitmaps = ext2fs_write_bitmaps;
95
96 start = EXT2FS_B2C(fs, fs->super->s_first_data_block);
97 end = EXT2FS_B2C(fs, ext2fs_blocks_count(fs->super)-1);
98 real_end = ((__u64) EXT2_CLUSTERS_PER_GROUP(fs->super)
99 * (__u64) fs->group_desc_count)-1 + start;
100
101 if (fs->flags & EXT2_FLAG_64BITS)
102 return (ext2fs_alloc_generic_bmap(fs,
103 EXT2_ET_MAGIC_BLOCK_BITMAP64,
104 fs->default_bitmap_type,
105 start, end, real_end, descr, ret));
106
107 if ((end > ~0U) || (real_end > ~0U))
108 return EXT2_ET_CANT_USE_LEGACY_BITMAPS;
109
110 return (ext2fs_make_generic_bitmap(EXT2_ET_MAGIC_BLOCK_BITMAP, fs,
111 start, end, real_end,
112 descr, 0,
113 (ext2fs_generic_bitmap *) ret));
114 }
115
116 /*
117 * ext2fs_allocate_block_bitmap() really allocates a per-cluster
118 * bitmap for backwards compatibility. This function allocates a
119 * block bitmap which is truly per-block, even if clusters/bigalloc
120 * are enabled. mke2fs and e2fsck need this for tracking the
121 * allocation of the file system metadata blocks.
122 */
ext2fs_allocate_subcluster_bitmap(ext2_filsys fs,const char * descr,ext2fs_block_bitmap * ret)123 errcode_t ext2fs_allocate_subcluster_bitmap(ext2_filsys fs,
124 const char *descr,
125 ext2fs_block_bitmap *ret)
126 {
127 __u64 start, end, real_end;
128 ext2fs_generic_bitmap bmap;
129 ext2fs_generic_bitmap_64 bmap64;
130 errcode_t retval;
131
132 EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
133
134 fs->write_bitmaps = ext2fs_write_bitmaps;
135
136 if (!fs->cluster_ratio_bits)
137 return ext2fs_allocate_block_bitmap(fs, descr, ret);
138
139 if ((fs->flags & EXT2_FLAG_64BITS) == 0)
140 return EXT2_ET_CANT_USE_LEGACY_BITMAPS;
141
142 start = fs->super->s_first_data_block;
143 end = ext2fs_blocks_count(fs->super)-1;
144 real_end = ((__u64) EXT2_BLOCKS_PER_GROUP(fs->super)
145 * (__u64) fs->group_desc_count)-1 + start;
146
147 retval = ext2fs_alloc_generic_bmap(fs, EXT2_ET_MAGIC_BLOCK_BITMAP64,
148 fs->default_bitmap_type, start,
149 end, real_end, descr, &bmap);
150 if (retval)
151 return retval;
152 bmap64 = (ext2fs_generic_bitmap_64) bmap;
153 bmap64->cluster_bits = 0;
154 *ret = bmap;
155 return 0;
156 }
157
ext2fs_get_bitmap_granularity(ext2fs_block_bitmap bitmap)158 int ext2fs_get_bitmap_granularity(ext2fs_block_bitmap bitmap)
159 {
160 ext2fs_generic_bitmap_64 bmap = (ext2fs_generic_bitmap_64) bitmap;
161
162 if (!EXT2FS_IS_64_BITMAP(bmap))
163 return 0;
164
165 return bmap->cluster_bits;
166 }
167
ext2fs_fudge_inode_bitmap_end(ext2fs_inode_bitmap bitmap,ext2_ino_t end,ext2_ino_t * oend)168 errcode_t ext2fs_fudge_inode_bitmap_end(ext2fs_inode_bitmap bitmap,
169 ext2_ino_t end, ext2_ino_t *oend)
170 {
171 __u64 tmp_oend;
172 int retval;
173
174 retval = ext2fs_fudge_generic_bmap_end((ext2fs_generic_bitmap) bitmap,
175 EXT2_ET_FUDGE_INODE_BITMAP_END,
176 end, &tmp_oend);
177 if (oend)
178 *oend = tmp_oend;
179 return retval;
180 }
181
ext2fs_fudge_block_bitmap_end(ext2fs_block_bitmap bitmap,blk_t end,blk_t * oend)182 errcode_t ext2fs_fudge_block_bitmap_end(ext2fs_block_bitmap bitmap,
183 blk_t end, blk_t *oend)
184 {
185 return (ext2fs_fudge_generic_bitmap_end(bitmap,
186 EXT2_ET_MAGIC_BLOCK_BITMAP,
187 EXT2_ET_FUDGE_BLOCK_BITMAP_END,
188 end, oend));
189 }
190
ext2fs_fudge_block_bitmap_end2(ext2fs_block_bitmap bitmap,blk64_t end,blk64_t * oend)191 errcode_t ext2fs_fudge_block_bitmap_end2(ext2fs_block_bitmap bitmap,
192 blk64_t end, blk64_t *oend)
193 {
194 return (ext2fs_fudge_generic_bmap_end(bitmap,
195 EXT2_ET_FUDGE_BLOCK_BITMAP_END,
196 end, oend));
197 }
198
ext2fs_clear_inode_bitmap(ext2fs_inode_bitmap bitmap)199 void ext2fs_clear_inode_bitmap(ext2fs_inode_bitmap bitmap)
200 {
201 ext2fs_clear_generic_bmap(bitmap);
202 }
203
ext2fs_clear_block_bitmap(ext2fs_block_bitmap bitmap)204 void ext2fs_clear_block_bitmap(ext2fs_block_bitmap bitmap)
205 {
206 ext2fs_clear_generic_bmap(bitmap);
207 }
208
ext2fs_resize_inode_bitmap(__u32 new_end,__u32 new_real_end,ext2fs_inode_bitmap bmap)209 errcode_t ext2fs_resize_inode_bitmap(__u32 new_end, __u32 new_real_end,
210 ext2fs_inode_bitmap bmap)
211 {
212 return (ext2fs_resize_generic_bitmap(EXT2_ET_MAGIC_INODE_BITMAP,
213 new_end, new_real_end, bmap));
214 }
215
ext2fs_resize_inode_bitmap2(__u64 new_end,__u64 new_real_end,ext2fs_inode_bitmap bmap)216 errcode_t ext2fs_resize_inode_bitmap2(__u64 new_end, __u64 new_real_end,
217 ext2fs_inode_bitmap bmap)
218 {
219 return (ext2fs_resize_generic_bmap(bmap, new_end, new_real_end));
220 }
221
ext2fs_resize_block_bitmap(__u32 new_end,__u32 new_real_end,ext2fs_block_bitmap bmap)222 errcode_t ext2fs_resize_block_bitmap(__u32 new_end, __u32 new_real_end,
223 ext2fs_block_bitmap bmap)
224 {
225 return (ext2fs_resize_generic_bitmap(EXT2_ET_MAGIC_BLOCK_BITMAP,
226 new_end, new_real_end, bmap));
227 }
228
ext2fs_resize_block_bitmap2(__u64 new_end,__u64 new_real_end,ext2fs_block_bitmap bmap)229 errcode_t ext2fs_resize_block_bitmap2(__u64 new_end, __u64 new_real_end,
230 ext2fs_block_bitmap bmap)
231 {
232 return (ext2fs_resize_generic_bmap(bmap, new_end, new_real_end));
233 }
234
ext2fs_compare_block_bitmap(ext2fs_block_bitmap bm1,ext2fs_block_bitmap bm2)235 errcode_t ext2fs_compare_block_bitmap(ext2fs_block_bitmap bm1,
236 ext2fs_block_bitmap bm2)
237 {
238 return (ext2fs_compare_generic_bmap(EXT2_ET_NEQ_BLOCK_BITMAP,
239 bm1, bm2));
240 }
241
ext2fs_compare_inode_bitmap(ext2fs_inode_bitmap bm1,ext2fs_inode_bitmap bm2)242 errcode_t ext2fs_compare_inode_bitmap(ext2fs_inode_bitmap bm1,
243 ext2fs_inode_bitmap bm2)
244 {
245 return (ext2fs_compare_generic_bmap(EXT2_ET_NEQ_INODE_BITMAP,
246 bm1, bm2));
247 }
248
ext2fs_set_inode_bitmap_range(ext2fs_inode_bitmap bmap,ext2_ino_t start,unsigned int num,void * in)249 errcode_t ext2fs_set_inode_bitmap_range(ext2fs_inode_bitmap bmap,
250 ext2_ino_t start, unsigned int num,
251 void *in)
252 {
253 return (ext2fs_set_generic_bitmap_range(bmap,
254 EXT2_ET_MAGIC_INODE_BITMAP,
255 start, num, in));
256 }
257
ext2fs_set_inode_bitmap_range2(ext2fs_inode_bitmap bmap,__u64 start,size_t num,void * in)258 errcode_t ext2fs_set_inode_bitmap_range2(ext2fs_inode_bitmap bmap,
259 __u64 start, size_t num,
260 void *in)
261 {
262 return (ext2fs_set_generic_bmap_range(bmap, start, num, in));
263 }
264
ext2fs_get_inode_bitmap_range(ext2fs_inode_bitmap bmap,ext2_ino_t start,unsigned int num,void * out)265 errcode_t ext2fs_get_inode_bitmap_range(ext2fs_inode_bitmap bmap,
266 ext2_ino_t start, unsigned int num,
267 void *out)
268 {
269 return (ext2fs_get_generic_bitmap_range(bmap,
270 EXT2_ET_MAGIC_INODE_BITMAP,
271 start, num, out));
272 }
273
ext2fs_get_inode_bitmap_range2(ext2fs_inode_bitmap bmap,__u64 start,size_t num,void * out)274 errcode_t ext2fs_get_inode_bitmap_range2(ext2fs_inode_bitmap bmap,
275 __u64 start, size_t num,
276 void *out)
277 {
278 return (ext2fs_get_generic_bmap_range(bmap, start, num, out));
279 }
280
ext2fs_set_block_bitmap_range(ext2fs_block_bitmap bmap,blk_t start,unsigned int num,void * in)281 errcode_t ext2fs_set_block_bitmap_range(ext2fs_block_bitmap bmap,
282 blk_t start, unsigned int num,
283 void *in)
284 {
285 return (ext2fs_set_generic_bitmap_range(bmap,
286 EXT2_ET_MAGIC_BLOCK_BITMAP,
287 start, num, in));
288 }
289
ext2fs_set_block_bitmap_range2(ext2fs_block_bitmap bmap,blk64_t start,size_t num,void * in)290 errcode_t ext2fs_set_block_bitmap_range2(ext2fs_block_bitmap bmap,
291 blk64_t start, size_t num,
292 void *in)
293 {
294 return (ext2fs_set_generic_bmap_range(bmap, start, num, in));
295 }
296
ext2fs_get_block_bitmap_range(ext2fs_block_bitmap bmap,blk_t start,unsigned int num,void * out)297 errcode_t ext2fs_get_block_bitmap_range(ext2fs_block_bitmap bmap,
298 blk_t start, unsigned int num,
299 void *out)
300 {
301 return (ext2fs_get_generic_bitmap_range(bmap,
302 EXT2_ET_MAGIC_BLOCK_BITMAP,
303 start, num, out));
304 }
305
ext2fs_get_block_bitmap_range2(ext2fs_block_bitmap bmap,blk64_t start,size_t num,void * out)306 errcode_t ext2fs_get_block_bitmap_range2(ext2fs_block_bitmap bmap,
307 blk64_t start, size_t num,
308 void *out)
309 {
310 return (ext2fs_get_generic_bmap_range(bmap, start, num, out));
311 }
312