1 /*
2 * gen_bitmap.c --- Generic (32-bit) bitmap routines
3 *
4 * Copyright (C) 2001 Theodore Ts'o.
5 *
6 * %Begin-Header%
7 * This file may be redistributed under the terms of the GNU Library
8 * General Public License, version 2.
9 * %End-Header%
10 */
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 "ext2fsP.h"
30
31 struct ext2fs_struct_generic_bitmap_32 {
32 errcode_t magic;
33 ext2_filsys fs;
34 __u32 start, end;
35 __u32 real_end;
36 char * description;
37 char * bitmap;
38 errcode_t base_error_code;
39 __u32 reserved[7];
40 };
41
42 typedef struct ext2fs_struct_generic_bitmap_32 *ext2fs_generic_bitmap_32;
43
44 #define EXT2FS_IS_32_BITMAP(bmap) \
45 (((bmap)->magic == EXT2_ET_MAGIC_GENERIC_BITMAP) || \
46 ((bmap)->magic == EXT2_ET_MAGIC_BLOCK_BITMAP) || \
47 ((bmap)->magic == EXT2_ET_MAGIC_INODE_BITMAP))
48
49 #define EXT2FS_IS_64_BITMAP(bmap) \
50 (((bmap)->magic == EXT2_ET_MAGIC_GENERIC_BITMAP64) || \
51 ((bmap)->magic == EXT2_ET_MAGIC_BLOCK_BITMAP64) || \
52 ((bmap)->magic == EXT2_ET_MAGIC_INODE_BITMAP64))
53
54 /*
55 * Used by previously inlined function, so we have to export this and
56 * not change the function signature
57 */
ext2fs_warn_bitmap2(ext2fs_generic_bitmap gen_bitmap,int code,unsigned long arg)58 void ext2fs_warn_bitmap2(ext2fs_generic_bitmap gen_bitmap,
59 int code, unsigned long arg)
60 {
61 ext2fs_generic_bitmap_32 bitmap = (ext2fs_generic_bitmap_32) gen_bitmap;
62
63 #ifndef OMIT_COM_ERR
64 if (bitmap->description)
65 com_err(0, bitmap->base_error_code+code,
66 "#%lu for %s", arg, bitmap->description);
67 else
68 com_err(0, bitmap->base_error_code + code, "#%lu", arg);
69 #endif
70 }
71
check_magic(ext2fs_generic_bitmap bitmap)72 static errcode_t check_magic(ext2fs_generic_bitmap bitmap)
73 {
74 if (!bitmap || !((bitmap->magic == EXT2_ET_MAGIC_GENERIC_BITMAP) ||
75 (bitmap->magic == EXT2_ET_MAGIC_INODE_BITMAP) ||
76 (bitmap->magic == EXT2_ET_MAGIC_BLOCK_BITMAP)))
77 return EXT2_ET_MAGIC_GENERIC_BITMAP;
78 return 0;
79 }
80
ext2fs_make_generic_bitmap(errcode_t magic,ext2_filsys fs,__u32 start,__u32 end,__u32 real_end,const char * descr,char * init_map,ext2fs_generic_bitmap * ret)81 errcode_t ext2fs_make_generic_bitmap(errcode_t magic, ext2_filsys fs,
82 __u32 start, __u32 end, __u32 real_end,
83 const char *descr, char *init_map,
84 ext2fs_generic_bitmap *ret)
85 {
86 ext2fs_generic_bitmap_32 bitmap;
87 errcode_t retval;
88 size_t size;
89
90 retval = ext2fs_get_mem(sizeof(struct ext2fs_struct_generic_bitmap_32),
91 &bitmap);
92 if (retval)
93 return retval;
94
95 bitmap->magic = magic;
96 bitmap->fs = fs;
97 bitmap->start = start;
98 bitmap->end = end;
99 bitmap->real_end = real_end;
100 switch (magic) {
101 case EXT2_ET_MAGIC_INODE_BITMAP:
102 bitmap->base_error_code = EXT2_ET_BAD_INODE_MARK;
103 break;
104 case EXT2_ET_MAGIC_BLOCK_BITMAP:
105 bitmap->base_error_code = EXT2_ET_BAD_BLOCK_MARK;
106 break;
107 default:
108 bitmap->base_error_code = EXT2_ET_BAD_GENERIC_MARK;
109 }
110 if (descr) {
111 retval = ext2fs_get_mem(strlen(descr)+1, &bitmap->description);
112 if (retval) {
113 ext2fs_free_mem(&bitmap);
114 return retval;
115 }
116 strcpy(bitmap->description, descr);
117 } else
118 bitmap->description = 0;
119
120 size = (size_t) (((bitmap->real_end - bitmap->start) / 8) + 1);
121 /* Round up to allow for the BT x86 instruction */
122 size = (size + 7) & ~3;
123 retval = ext2fs_get_mem(size, &bitmap->bitmap);
124 if (retval) {
125 ext2fs_free_mem(&bitmap->description);
126 ext2fs_free_mem(&bitmap);
127 return retval;
128 }
129
130 if (init_map)
131 memcpy(bitmap->bitmap, init_map, size);
132 else
133 memset(bitmap->bitmap, 0, size);
134 *ret = (ext2fs_generic_bitmap) bitmap;
135 return 0;
136 }
137
ext2fs_allocate_generic_bitmap(__u32 start,__u32 end,__u32 real_end,const char * descr,ext2fs_generic_bitmap * ret)138 errcode_t ext2fs_allocate_generic_bitmap(__u32 start,
139 __u32 end,
140 __u32 real_end,
141 const char *descr,
142 ext2fs_generic_bitmap *ret)
143 {
144 return ext2fs_make_generic_bitmap(EXT2_ET_MAGIC_GENERIC_BITMAP, 0,
145 start, end, real_end, descr, 0, ret);
146 }
147
ext2fs_copy_generic_bitmap(ext2fs_generic_bitmap gen_src,ext2fs_generic_bitmap * dest)148 errcode_t ext2fs_copy_generic_bitmap(ext2fs_generic_bitmap gen_src,
149 ext2fs_generic_bitmap *dest)
150 {
151 ext2fs_generic_bitmap_32 src = (ext2fs_generic_bitmap_32) gen_src;
152
153 return (ext2fs_make_generic_bitmap(src->magic, src->fs,
154 src->start, src->end,
155 src->real_end,
156 src->description, src->bitmap,
157 dest));
158 }
159
ext2fs_free_generic_bitmap(ext2fs_inode_bitmap gen_bitmap)160 void ext2fs_free_generic_bitmap(ext2fs_inode_bitmap gen_bitmap)
161 {
162 ext2fs_generic_bitmap_32 bitmap = (ext2fs_generic_bitmap_32) gen_bitmap;
163
164 if (check_magic(gen_bitmap))
165 return;
166
167 bitmap->magic = 0;
168 if (bitmap->description) {
169 ext2fs_free_mem(&bitmap->description);
170 bitmap->description = 0;
171 }
172 if (bitmap->bitmap) {
173 ext2fs_free_mem(&bitmap->bitmap);
174 bitmap->bitmap = 0;
175 }
176 ext2fs_free_mem(&bitmap);
177 }
178
ext2fs_test_generic_bitmap(ext2fs_generic_bitmap bitmap,blk_t bitno)179 int ext2fs_test_generic_bitmap(ext2fs_generic_bitmap bitmap,
180 blk_t bitno)
181 {
182 ext2fs_generic_bitmap_32 bitmap32 = (ext2fs_generic_bitmap_32) bitmap;
183
184 if (!EXT2FS_IS_32_BITMAP(bitmap)) {
185 if (EXT2FS_IS_64_BITMAP(bitmap)) {
186 ext2fs_warn_bitmap32(bitmap, __func__);
187 return ext2fs_test_generic_bmap(bitmap, bitno);
188 }
189 #ifndef OMIT_COM_ERR
190 com_err(0, EXT2_ET_MAGIC_GENERIC_BITMAP,
191 "test_bitmap(%lu)", (unsigned long) bitno);
192 #endif
193 return 0;
194 }
195
196 if ((bitno < bitmap32->start) || (bitno > bitmap32->end)) {
197 ext2fs_warn_bitmap2(bitmap, EXT2FS_TEST_ERROR, bitno);
198 return 0;
199 }
200 return ext2fs_test_bit(bitno - bitmap32->start, bitmap32->bitmap);
201 }
202
ext2fs_mark_generic_bitmap(ext2fs_generic_bitmap bitmap,__u32 bitno)203 int ext2fs_mark_generic_bitmap(ext2fs_generic_bitmap bitmap,
204 __u32 bitno)
205 {
206 ext2fs_generic_bitmap_32 bitmap32 = (ext2fs_generic_bitmap_32) bitmap;
207
208 if (!EXT2FS_IS_32_BITMAP(bitmap)) {
209 if (EXT2FS_IS_64_BITMAP(bitmap)) {
210 ext2fs_warn_bitmap32(bitmap, __func__);
211 return ext2fs_mark_generic_bmap(bitmap, bitno);
212 }
213 #ifndef OMIT_COM_ERR
214 com_err(0, EXT2_ET_MAGIC_GENERIC_BITMAP,
215 "mark_bitmap(%lu)", (unsigned long) bitno);
216 #endif
217 return 0;
218 }
219
220 if ((bitno < bitmap32->start) || (bitno > bitmap32->end)) {
221 ext2fs_warn_bitmap2(bitmap, EXT2FS_MARK_ERROR, bitno);
222 return 0;
223 }
224 return ext2fs_set_bit(bitno - bitmap32->start, bitmap32->bitmap);
225 }
226
ext2fs_unmark_generic_bitmap(ext2fs_generic_bitmap bitmap,blk_t bitno)227 int ext2fs_unmark_generic_bitmap(ext2fs_generic_bitmap bitmap,
228 blk_t bitno)
229 {
230 ext2fs_generic_bitmap_32 bitmap32 = (ext2fs_generic_bitmap_32) bitmap;
231
232 if (!EXT2FS_IS_32_BITMAP(bitmap)) {
233 if (EXT2FS_IS_64_BITMAP(bitmap)) {
234 ext2fs_warn_bitmap32(bitmap, __func__);
235 return ext2fs_unmark_generic_bmap(bitmap, bitno);
236 }
237 #ifndef OMIT_COM_ERR
238 com_err(0, EXT2_ET_MAGIC_GENERIC_BITMAP,
239 "mark_bitmap(%lu)", (unsigned long) bitno);
240 #endif
241 return 0;
242 }
243
244 if ((bitno < bitmap32->start) || (bitno > bitmap32->end)) {
245 ext2fs_warn_bitmap2(bitmap, EXT2FS_UNMARK_ERROR, bitno);
246 return 0;
247 }
248 return ext2fs_clear_bit(bitno - bitmap32->start, bitmap32->bitmap);
249 }
250
ext2fs_get_generic_bitmap_start(ext2fs_generic_bitmap bitmap)251 __u32 ext2fs_get_generic_bitmap_start(ext2fs_generic_bitmap bitmap)
252 {
253 ext2fs_generic_bitmap_32 bitmap32 = (ext2fs_generic_bitmap_32) bitmap;
254
255 if (!EXT2FS_IS_32_BITMAP(bitmap)) {
256 if (EXT2FS_IS_64_BITMAP(bitmap)) {
257 ext2fs_warn_bitmap32(bitmap, __func__);
258 return ext2fs_get_generic_bmap_start(bitmap);
259 }
260 #ifndef OMIT_COM_ERR
261 com_err(0, EXT2_ET_MAGIC_GENERIC_BITMAP,
262 "get_bitmap_start");
263 #endif
264 return 0;
265 }
266
267 return bitmap32->start;
268 }
269
ext2fs_get_generic_bitmap_end(ext2fs_generic_bitmap bitmap)270 __u32 ext2fs_get_generic_bitmap_end(ext2fs_generic_bitmap bitmap)
271 {
272 ext2fs_generic_bitmap_32 bitmap32 = (ext2fs_generic_bitmap_32) bitmap;
273
274 if (!EXT2FS_IS_32_BITMAP(bitmap)) {
275 if (EXT2FS_IS_64_BITMAP(bitmap)) {
276 ext2fs_warn_bitmap32(bitmap, __func__);
277 return ext2fs_get_generic_bmap_end(bitmap);
278 }
279 #ifndef OMIT_COM_ERR
280 com_err(0, EXT2_ET_MAGIC_GENERIC_BITMAP,
281 "get_bitmap_end");
282 #endif
283 return 0;
284 }
285 return bitmap32->end;
286 }
287
ext2fs_clear_generic_bitmap(ext2fs_generic_bitmap bitmap)288 void ext2fs_clear_generic_bitmap(ext2fs_generic_bitmap bitmap)
289 {
290 ext2fs_generic_bitmap_32 bitmap32 = (ext2fs_generic_bitmap_32) bitmap;
291
292 if (!EXT2FS_IS_32_BITMAP(bitmap)) {
293 if (EXT2FS_IS_64_BITMAP(bitmap)) {
294 ext2fs_warn_bitmap32(bitmap, __func__);
295 ext2fs_clear_generic_bmap(bitmap);
296 return;
297 }
298 #ifndef OMIT_COM_ERR
299 com_err(0, EXT2_ET_MAGIC_GENERIC_BITMAP,
300 "clear_generic_bitmap");
301 #endif
302 return;
303 }
304
305 memset(bitmap32->bitmap, 0,
306 (size_t) (((bitmap32->real_end - bitmap32->start) / 8) + 1));
307 }
308
ext2fs_fudge_generic_bitmap_end(ext2fs_inode_bitmap gen_bitmap,errcode_t magic,errcode_t neq,ext2_ino_t end,ext2_ino_t * oend)309 errcode_t ext2fs_fudge_generic_bitmap_end(ext2fs_inode_bitmap gen_bitmap,
310 errcode_t magic, errcode_t neq,
311 ext2_ino_t end, ext2_ino_t *oend)
312 {
313 ext2fs_generic_bitmap_32 bitmap = (ext2fs_generic_bitmap_32) gen_bitmap;
314
315 EXT2_CHECK_MAGIC(bitmap, magic);
316
317 if (end > bitmap->real_end)
318 return neq;
319 if (oend)
320 *oend = bitmap->end;
321 bitmap->end = end;
322 return 0;
323 }
324
ext2fs_resize_generic_bitmap(errcode_t magic,__u32 new_end,__u32 new_real_end,ext2fs_generic_bitmap gen_bmap)325 errcode_t ext2fs_resize_generic_bitmap(errcode_t magic,
326 __u32 new_end, __u32 new_real_end,
327 ext2fs_generic_bitmap gen_bmap)
328 {
329 ext2fs_generic_bitmap_32 bmap = (ext2fs_generic_bitmap_32) gen_bmap;
330 errcode_t retval;
331 size_t size, new_size;
332 __u32 bitno;
333
334 if (!bmap || (bmap->magic != magic))
335 return magic;
336
337 /*
338 * If we're expanding the bitmap, make sure all of the new
339 * parts of the bitmap are zero.
340 */
341 if (new_end > bmap->end) {
342 bitno = bmap->real_end;
343 if (bitno > new_end)
344 bitno = new_end;
345 for (; bitno > bmap->end; bitno--)
346 ext2fs_clear_bit(bitno - bmap->start, bmap->bitmap);
347 }
348 if (new_real_end == bmap->real_end) {
349 bmap->end = new_end;
350 return 0;
351 }
352
353 size = ((bmap->real_end - bmap->start) / 8) + 1;
354 new_size = ((new_real_end - bmap->start) / 8) + 1;
355
356 if (size != new_size) {
357 retval = ext2fs_resize_mem(size, new_size, &bmap->bitmap);
358 if (retval)
359 return retval;
360 }
361 if (new_size > size)
362 memset(bmap->bitmap + size, 0, new_size - size);
363
364 bmap->end = new_end;
365 bmap->real_end = new_real_end;
366 return 0;
367 }
368
ext2fs_compare_generic_bitmap(errcode_t magic,errcode_t neq,ext2fs_generic_bitmap gen_bm1,ext2fs_generic_bitmap gen_bm2)369 errcode_t ext2fs_compare_generic_bitmap(errcode_t magic, errcode_t neq,
370 ext2fs_generic_bitmap gen_bm1,
371 ext2fs_generic_bitmap gen_bm2)
372 {
373 ext2fs_generic_bitmap_32 bm1 = (ext2fs_generic_bitmap_32) gen_bm1;
374 ext2fs_generic_bitmap_32 bm2 = (ext2fs_generic_bitmap_32) gen_bm2;
375 blk_t i;
376
377 if (!bm1 || bm1->magic != magic)
378 return magic;
379 if (!bm2 || bm2->magic != magic)
380 return magic;
381
382 if ((bm1->start != bm2->start) ||
383 (bm1->end != bm2->end) ||
384 (memcmp(bm1->bitmap, bm2->bitmap,
385 (size_t) (bm1->end - bm1->start)/8)))
386 return neq;
387
388 for (i = bm1->end - ((bm1->end - bm1->start) % 8); i <= bm1->end; i++)
389 if (ext2fs_fast_test_block_bitmap(gen_bm1, i) !=
390 ext2fs_fast_test_block_bitmap(gen_bm2, i))
391 return neq;
392
393 return 0;
394 }
395
ext2fs_set_generic_bitmap_padding(ext2fs_generic_bitmap gen_map)396 void ext2fs_set_generic_bitmap_padding(ext2fs_generic_bitmap gen_map)
397 {
398 ext2fs_generic_bitmap_32 map = (ext2fs_generic_bitmap_32) gen_map;
399 __u32 i, j;
400
401 /* Protect loop from wrap-around if map->real_end is maxed */
402 for (i=map->end+1, j = i - map->start;
403 i <= map->real_end && i > map->end;
404 i++, j++)
405 ext2fs_set_bit(j, map->bitmap);
406 }
407
ext2fs_get_generic_bitmap_range(ext2fs_generic_bitmap gen_bmap,errcode_t magic,__u32 start,__u32 num,void * out)408 errcode_t ext2fs_get_generic_bitmap_range(ext2fs_generic_bitmap gen_bmap,
409 errcode_t magic,
410 __u32 start, __u32 num,
411 void *out)
412 {
413 ext2fs_generic_bitmap_32 bmap = (ext2fs_generic_bitmap_32) gen_bmap;
414
415 if (!bmap || (bmap->magic != magic))
416 return magic;
417
418 if ((start < bmap->start) || (start+num-1 > bmap->real_end))
419 return EXT2_ET_INVALID_ARGUMENT;
420
421 memcpy(out, bmap->bitmap + (start >> 3), (num+7) >> 3);
422 return 0;
423 }
424
ext2fs_set_generic_bitmap_range(ext2fs_generic_bitmap gen_bmap,errcode_t magic,__u32 start,__u32 num,void * in)425 errcode_t ext2fs_set_generic_bitmap_range(ext2fs_generic_bitmap gen_bmap,
426 errcode_t magic,
427 __u32 start, __u32 num,
428 void *in)
429 {
430 ext2fs_generic_bitmap_32 bmap = (ext2fs_generic_bitmap_32) gen_bmap;
431
432 if (!bmap || (bmap->magic != magic))
433 return magic;
434
435 if ((start < bmap->start) || (start+num-1 > bmap->real_end))
436 return EXT2_ET_INVALID_ARGUMENT;
437
438 memcpy(bmap->bitmap + (start >> 3), in, (num+7) >> 3);
439 return 0;
440 }
441
442 /*
443 * Compare @mem to zero buffer by 256 bytes.
444 * Return 1 if @mem is zeroed memory, otherwise return 0.
445 */
ext2fs_mem_is_zero(const char * mem,size_t len)446 int ext2fs_mem_is_zero(const char *mem, size_t len)
447 {
448 static const char zero_buf[256];
449
450 while (len >= sizeof(zero_buf)) {
451 if (memcmp(mem, zero_buf, sizeof(zero_buf)))
452 return 0;
453 len -= sizeof(zero_buf);
454 mem += sizeof(zero_buf);
455 }
456 /* Deal with leftover bytes. */
457 if (len)
458 return !memcmp(mem, zero_buf, len);
459 return 1;
460 }
461
462 /*
463 * Return true if all of the bits in a specified range are clear
464 */
ext2fs_test_clear_generic_bitmap_range(ext2fs_generic_bitmap gen_bitmap,unsigned int start,unsigned int len)465 static int ext2fs_test_clear_generic_bitmap_range(ext2fs_generic_bitmap gen_bitmap,
466 unsigned int start,
467 unsigned int len)
468 {
469 ext2fs_generic_bitmap_32 bitmap = (ext2fs_generic_bitmap_32) gen_bitmap;
470 size_t start_byte, len_byte = len >> 3;
471 unsigned int start_bit, len_bit = len % 8;
472 int first_bit = 0;
473 int last_bit = 0;
474 int mark_count = 0;
475 int mark_bit = 0;
476 int i;
477 const char *ADDR = bitmap->bitmap;
478
479 start -= bitmap->start;
480 start_byte = start >> 3;
481 start_bit = start % 8;
482
483 if (start_bit != 0) {
484 /*
485 * The compared start block number or start inode number
486 * is not the first bit in a byte.
487 */
488 mark_count = 8 - start_bit;
489 if (len < 8 - start_bit) {
490 mark_count = (int)len;
491 mark_bit = len + start_bit - 1;
492 } else
493 mark_bit = 7;
494
495 for (i = mark_count; i > 0; i--, mark_bit--)
496 first_bit |= 1 << mark_bit;
497
498 /*
499 * Compare blocks or inodes in the first byte.
500 * If there is any marked bit, this function returns 0.
501 */
502 if (first_bit & ADDR[start_byte])
503 return 0;
504 else if (len <= 8 - start_bit)
505 return 1;
506
507 start_byte++;
508 len_bit = (len - mark_count) % 8;
509 len_byte = (len - mark_count) >> 3;
510 }
511
512 /*
513 * The compared start block number or start inode number is
514 * the first bit in a byte.
515 */
516 if (len_bit != 0) {
517 /*
518 * The compared end block number or end inode number is
519 * not the last bit in a byte.
520 */
521 for (mark_bit = len_bit - 1; mark_bit >= 0; mark_bit--)
522 last_bit |= 1 << mark_bit;
523
524 /*
525 * Compare blocks or inodes in the last byte.
526 * If there is any marked bit, this function returns 0.
527 */
528 if (last_bit & ADDR[start_byte + len_byte])
529 return 0;
530 else if (len_byte == 0)
531 return 1;
532 }
533
534 /* Check whether all bytes are 0 */
535 return ext2fs_mem_is_zero(ADDR + start_byte, len_byte);
536 }
537
ext2fs_find_first_zero_generic_bitmap(ext2fs_generic_bitmap gen_bitmap,__u32 start,__u32 end,__u32 * out)538 errcode_t ext2fs_find_first_zero_generic_bitmap(ext2fs_generic_bitmap gen_bitmap,
539 __u32 start, __u32 end,
540 __u32 *out)
541 {
542 ext2fs_generic_bitmap_32 bitmap = (ext2fs_generic_bitmap_32) gen_bitmap;
543 blk_t b;
544
545 if (start < bitmap->start || end > bitmap->end || start > end) {
546 ext2fs_warn_bitmap2(gen_bitmap, EXT2FS_TEST_ERROR, start);
547 return EINVAL;
548 }
549
550 while (start <= end) {
551 b = ext2fs_test_bit(start - bitmap->start, bitmap->bitmap);
552 if (!b) {
553 *out = start;
554 return 0;
555 }
556 start++;
557 }
558
559 return ENOENT;
560 }
561
ext2fs_find_first_set_generic_bitmap(ext2fs_generic_bitmap gen_bitmap,__u32 start,__u32 end,__u32 * out)562 errcode_t ext2fs_find_first_set_generic_bitmap(ext2fs_generic_bitmap gen_bitmap,
563 __u32 start, __u32 end,
564 __u32 *out)
565 {
566 ext2fs_generic_bitmap_32 bitmap = (ext2fs_generic_bitmap_32) gen_bitmap;
567 blk_t b;
568
569 if (start < bitmap->start || end > bitmap->end || start > end) {
570 ext2fs_warn_bitmap2(gen_bitmap, EXT2FS_TEST_ERROR, start);
571 return EINVAL;
572 }
573
574 while (start <= end) {
575 b = ext2fs_test_bit(start - bitmap->start, bitmap->bitmap);
576 if (b) {
577 *out = start;
578 return 0;
579 }
580 start++;
581 }
582
583 return ENOENT;
584 }
585
ext2fs_test_block_bitmap_range(ext2fs_block_bitmap gen_bitmap,blk_t block,int num)586 int ext2fs_test_block_bitmap_range(ext2fs_block_bitmap gen_bitmap,
587 blk_t block, int num)
588 {
589 ext2fs_generic_bitmap_32 bitmap = (ext2fs_generic_bitmap_32) gen_bitmap;
590
591 EXT2_CHECK_MAGIC(bitmap, EXT2_ET_MAGIC_BLOCK_BITMAP);
592 if ((block < bitmap->start) || (block > bitmap->real_end) ||
593 (block+num-1 > bitmap->real_end)) {
594 ext2fs_warn_bitmap(EXT2_ET_BAD_BLOCK_TEST,
595 block, bitmap->description);
596 return 0;
597 }
598 return ext2fs_test_clear_generic_bitmap_range((ext2fs_generic_bitmap)
599 bitmap, block, num);
600 }
601
ext2fs_test_inode_bitmap_range(ext2fs_inode_bitmap gen_bitmap,ext2_ino_t inode,int num)602 int ext2fs_test_inode_bitmap_range(ext2fs_inode_bitmap gen_bitmap,
603 ext2_ino_t inode, int num)
604 {
605 ext2fs_generic_bitmap_32 bitmap = (ext2fs_generic_bitmap_32) gen_bitmap;
606
607 EXT2_CHECK_MAGIC(bitmap, EXT2_ET_MAGIC_INODE_BITMAP);
608 if ((inode < bitmap->start) || (inode > bitmap->real_end) ||
609 (inode+num-1 > bitmap->real_end)) {
610 ext2fs_warn_bitmap(EXT2_ET_BAD_INODE_TEST,
611 inode, bitmap->description);
612 return 0;
613 }
614 return ext2fs_test_clear_generic_bitmap_range((ext2fs_generic_bitmap)
615 bitmap, inode, num);
616 }
617
ext2fs_mark_block_bitmap_range(ext2fs_block_bitmap gen_bitmap,blk_t block,int num)618 void ext2fs_mark_block_bitmap_range(ext2fs_block_bitmap gen_bitmap,
619 blk_t block, int num)
620 {
621 ext2fs_generic_bitmap_32 bitmap = (ext2fs_generic_bitmap_32) gen_bitmap;
622 int i;
623
624 if ((block < bitmap->start) || (block > bitmap->end) ||
625 (block+num-1 > bitmap->end)) {
626 ext2fs_warn_bitmap(EXT2_ET_BAD_BLOCK_MARK, block,
627 bitmap->description);
628 return;
629 }
630 for (i=0; i < num; i++)
631 ext2fs_fast_set_bit(block + i - bitmap->start, bitmap->bitmap);
632 }
633
ext2fs_unmark_block_bitmap_range(ext2fs_block_bitmap gen_bitmap,blk_t block,int num)634 void ext2fs_unmark_block_bitmap_range(ext2fs_block_bitmap gen_bitmap,
635 blk_t block, int num)
636 {
637 ext2fs_generic_bitmap_32 bitmap = (ext2fs_generic_bitmap_32) gen_bitmap;
638 int i;
639
640 if ((block < bitmap->start) || (block > bitmap->end) ||
641 (block+num-1 > bitmap->end)) {
642 ext2fs_warn_bitmap(EXT2_ET_BAD_BLOCK_UNMARK, block,
643 bitmap->description);
644 return;
645 }
646 for (i=0; i < num; i++)
647 ext2fs_fast_clear_bit(block + i - bitmap->start,
648 bitmap->bitmap);
649 }
650
651