1 /*
2 * rw_bitmaps.c --- routines to read and write the inode and block bitmaps.
3 *
4 * Copyright (C) 1993, 1994, 1994, 1996 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 #include "config.h"
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 #ifdef HAVE_SYS_STAT_H
21 #include <sys/stat.h>
22 #endif
23 #ifdef HAVE_SYS_TYPES_H
24 #include <sys/types.h>
25 #endif
26 #ifdef HAVE_PTHREAD_H
27 #include <pthread.h>
28 #endif
29
30 #include "ext2_fs.h"
31 #include "ext2fs.h"
32 #include "e2image.h"
33
34 #ifdef HAVE_PTHREAD
35 typedef pthread_mutex_t mutex_t;
36
unix_pthread_mutex_lock(mutex_t * mutex)37 static void unix_pthread_mutex_lock(mutex_t *mutex)
38 {
39 if (mutex)
40 pthread_mutex_lock(mutex);
41 }
unix_pthread_mutex_unlock(mutex_t * mutex)42 static void unix_pthread_mutex_unlock(mutex_t *mutex)
43 {
44 if (mutex)
45 pthread_mutex_unlock(mutex);
46 }
47 #else
48 typedef int mutex_t;
49 #define unix_pthread_mutex_lock(mutex_t) do {} while (0)
50 #define unix_pthread_mutex_unlock(mutex_t) do {} while (0)
51 #endif
52
write_bitmaps(ext2_filsys fs,int do_inode,int do_block)53 static errcode_t write_bitmaps(ext2_filsys fs, int do_inode, int do_block)
54 {
55 dgrp_t i;
56 unsigned int j;
57 int block_nbytes, inode_nbytes;
58 unsigned int nbits;
59 errcode_t retval;
60 char *block_buf = NULL, *inode_buf = NULL;
61 int csum_flag;
62 blk64_t blk;
63 blk64_t blk_itr = EXT2FS_B2C(fs, fs->super->s_first_data_block);
64 ext2_ino_t ino_itr = 1;
65
66 EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
67
68 if (!(fs->flags & EXT2_FLAG_RW))
69 return EXT2_ET_RO_FILSYS;
70
71 csum_flag = ext2fs_has_group_desc_csum(fs);
72
73 inode_nbytes = block_nbytes = 0;
74 if (do_block) {
75 block_nbytes = EXT2_CLUSTERS_PER_GROUP(fs->super) / 8;
76 retval = io_channel_alloc_buf(fs->io, 0, &block_buf);
77 if (retval)
78 goto errout;
79 memset(block_buf, 0xff, fs->blocksize);
80 }
81 if (do_inode) {
82 inode_nbytes = (size_t)
83 ((EXT2_INODES_PER_GROUP(fs->super)+7) / 8);
84 retval = io_channel_alloc_buf(fs->io, 0, &inode_buf);
85 if (retval)
86 goto errout;
87 memset(inode_buf, 0xff, fs->blocksize);
88 }
89
90 for (i = 0; i < fs->group_desc_count; i++) {
91 if (!do_block)
92 goto skip_block_bitmap;
93
94 if (csum_flag && ext2fs_bg_flags_test(fs, i, EXT2_BG_BLOCK_UNINIT)
95 )
96 goto skip_this_block_bitmap;
97
98 retval = ext2fs_get_block_bitmap_range2(fs->block_map,
99 blk_itr, block_nbytes << 3, block_buf);
100 if (retval)
101 goto errout;
102
103 if (i == fs->group_desc_count - 1) {
104 /* Force bitmap padding for the last group */
105 nbits = EXT2FS_NUM_B2C(fs,
106 ((ext2fs_blocks_count(fs->super)
107 - (__u64) fs->super->s_first_data_block)
108 % (__u64) EXT2_BLOCKS_PER_GROUP(fs->super)));
109 if (nbits)
110 for (j = nbits; j < fs->blocksize * 8; j++)
111 ext2fs_set_bit(j, block_buf);
112 }
113
114 retval = ext2fs_block_bitmap_csum_set(fs, i, block_buf,
115 block_nbytes);
116 if (retval)
117 return retval;
118 ext2fs_group_desc_csum_set(fs, i);
119 fs->flags |= EXT2_FLAG_DIRTY;
120
121 blk = ext2fs_block_bitmap_loc(fs, i);
122 if (blk) {
123 retval = io_channel_write_blk64(fs->io, blk, 1,
124 block_buf);
125 if (retval) {
126 retval = EXT2_ET_BLOCK_BITMAP_WRITE;
127 goto errout;
128 }
129 }
130 skip_this_block_bitmap:
131 blk_itr += block_nbytes << 3;
132 skip_block_bitmap:
133
134 if (!do_inode)
135 continue;
136
137 if (csum_flag && ext2fs_bg_flags_test(fs, i, EXT2_BG_INODE_UNINIT)
138 )
139 goto skip_this_inode_bitmap;
140
141 retval = ext2fs_get_inode_bitmap_range2(fs->inode_map,
142 ino_itr, inode_nbytes << 3, inode_buf);
143 if (retval)
144 goto errout;
145
146 retval = ext2fs_inode_bitmap_csum_set(fs, i, inode_buf,
147 inode_nbytes);
148 if (retval)
149 goto errout;
150 ext2fs_group_desc_csum_set(fs, i);
151 fs->flags |= EXT2_FLAG_DIRTY;
152
153 blk = ext2fs_inode_bitmap_loc(fs, i);
154 if (blk) {
155 retval = io_channel_write_blk64(fs->io, blk, 1,
156 inode_buf);
157 if (retval) {
158 retval = EXT2_ET_INODE_BITMAP_WRITE;
159 goto errout;
160 }
161 }
162 skip_this_inode_bitmap:
163 ino_itr += inode_nbytes << 3;
164
165 }
166 if (do_block) {
167 fs->flags &= ~EXT2_FLAG_BB_DIRTY;
168 ext2fs_free_mem(&block_buf);
169 }
170 if (do_inode) {
171 fs->flags &= ~EXT2_FLAG_IB_DIRTY;
172 ext2fs_free_mem(&inode_buf);
173 }
174 return 0;
175 errout:
176 if (inode_buf)
177 ext2fs_free_mem(&inode_buf);
178 if (block_buf)
179 ext2fs_free_mem(&block_buf);
180 return retval;
181 }
182
mark_uninit_bg_group_blocks(ext2_filsys fs)183 static errcode_t mark_uninit_bg_group_blocks(ext2_filsys fs)
184 {
185 dgrp_t i;
186 blk64_t blk;
187 ext2fs_block_bitmap bmap = fs->block_map;
188
189 for (i = 0; i < fs->group_desc_count; i++) {
190 if (!ext2fs_bg_flags_test(fs, i, EXT2_BG_BLOCK_UNINIT))
191 continue;
192
193 ext2fs_reserve_super_and_bgd(fs, i, bmap);
194
195 /*
196 * Mark the blocks used for the inode table
197 */
198 blk = ext2fs_inode_table_loc(fs, i);
199 if (blk)
200 ext2fs_mark_block_bitmap_range2(bmap, blk,
201 fs->inode_blocks_per_group);
202
203 /*
204 * Mark block used for the block bitmap
205 */
206 blk = ext2fs_block_bitmap_loc(fs, i);
207 if (blk)
208 ext2fs_mark_block_bitmap2(bmap, blk);
209
210 /*
211 * Mark block used for the inode bitmap
212 */
213 blk = ext2fs_inode_bitmap_loc(fs, i);
214 if (blk)
215 ext2fs_mark_block_bitmap2(bmap, blk);
216 }
217 return 0;
218 }
219
bitmap_tail_verify(unsigned char * bitmap,int first,int last)220 static int bitmap_tail_verify(unsigned char *bitmap, int first, int last)
221 {
222 int i;
223
224 for (i = first; i <= last; i++)
225 if (bitmap[i] != 0xff)
226 return 0;
227 return 1;
228 }
229
read_bitmaps_range_prepare(ext2_filsys fs,int flags)230 static errcode_t read_bitmaps_range_prepare(ext2_filsys fs, int flags)
231 {
232 errcode_t retval;
233 int block_nbytes = EXT2_CLUSTERS_PER_GROUP(fs->super) / 8;
234 int inode_nbytes = EXT2_INODES_PER_GROUP(fs->super) / 8;
235 char *buf;
236
237 EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
238
239 if ((block_nbytes > (int) fs->blocksize) ||
240 (inode_nbytes > (int) fs->blocksize))
241 return EXT2_ET_CORRUPT_SUPERBLOCK;
242
243 fs->write_bitmaps = ext2fs_write_bitmaps;
244
245 retval = ext2fs_get_mem(strlen(fs->device_name) + 80, &buf);
246 if (retval)
247 return retval;
248
249 if (flags & EXT2FS_BITMAPS_BLOCK) {
250 if (fs->block_map)
251 ext2fs_free_block_bitmap(fs->block_map);
252 strcpy(buf, "block bitmap for ");
253 strcat(buf, fs->device_name);
254 retval = ext2fs_allocate_block_bitmap(fs, buf, &fs->block_map);
255 if (retval)
256 goto cleanup;
257 }
258
259 if (flags & EXT2FS_BITMAPS_INODE) {
260 if (fs->inode_map)
261 ext2fs_free_inode_bitmap(fs->inode_map);
262 strcpy(buf, "inode bitmap for ");
263 strcat(buf, fs->device_name);
264 retval = ext2fs_allocate_inode_bitmap(fs, buf, &fs->inode_map);
265 if (retval)
266 goto cleanup;
267 }
268 ext2fs_free_mem(&buf);
269 return retval;
270
271 cleanup:
272 if (flags & EXT2FS_BITMAPS_BLOCK) {
273 ext2fs_free_block_bitmap(fs->block_map);
274 fs->block_map = 0;
275 }
276 if (flags & EXT2FS_BITMAPS_INODE) {
277 ext2fs_free_inode_bitmap(fs->inode_map);
278 fs->inode_map = 0;
279 }
280 ext2fs_free_mem(&buf);
281 return retval;
282 }
283
read_bitmaps_range_start(ext2_filsys fs,int flags,dgrp_t start,dgrp_t end,mutex_t * mutex,int * tail_flags)284 static errcode_t read_bitmaps_range_start(ext2_filsys fs, int flags,
285 dgrp_t start, dgrp_t end,
286 mutex_t *mutex,
287 int *tail_flags)
288 {
289 dgrp_t i;
290 char *block_bitmap = 0, *inode_bitmap = 0;
291 errcode_t retval = 0;
292 int block_nbytes = EXT2_CLUSTERS_PER_GROUP(fs->super) / 8;
293 int inode_nbytes = EXT2_INODES_PER_GROUP(fs->super) / 8;
294 int csum_flag;
295 unsigned int cnt;
296 blk64_t blk;
297 blk64_t blk_itr = EXT2FS_B2C(fs, fs->super->s_first_data_block);
298 blk64_t blk_cnt;
299 ext2_ino_t ino_itr = 1;
300 ext2_ino_t ino_cnt;
301
302 csum_flag = ext2fs_has_group_desc_csum(fs);
303
304 if (flags & EXT2FS_BITMAPS_BLOCK) {
305 retval = io_channel_alloc_buf(fs->io, 0, &block_bitmap);
306 if (retval)
307 goto cleanup;
308 } else {
309 block_nbytes = 0;
310 }
311
312 if (flags & EXT2FS_BITMAPS_INODE) {
313 retval = io_channel_alloc_buf(fs->io, 0, &inode_bitmap);
314 if (retval)
315 goto cleanup;
316 } else {
317 inode_nbytes = 0;
318 }
319
320 /* io should be null */
321 if (fs->flags & EXT2_FLAG_IMAGE_FILE) {
322 blk = (ext2fs_le32_to_cpu(fs->image_header->offset_inodemap) / fs->blocksize);
323 ino_cnt = fs->super->s_inodes_count;
324 while (inode_bitmap && ino_cnt > 0) {
325 retval = io_channel_read_blk64(fs->image_io, blk++,
326 1, inode_bitmap);
327 if (retval)
328 goto cleanup;
329 cnt = fs->blocksize << 3;
330 if (cnt > ino_cnt)
331 cnt = ino_cnt;
332 retval = ext2fs_set_inode_bitmap_range2(fs->inode_map,
333 ino_itr, cnt, inode_bitmap);
334 if (retval)
335 goto cleanup;
336 ino_itr += cnt;
337 ino_cnt -= cnt;
338 }
339 blk = (ext2fs_le32_to_cpu(fs->image_header->offset_blockmap) /
340 fs->blocksize);
341 blk_cnt = EXT2_GROUPS_TO_CLUSTERS(fs->super,
342 fs->group_desc_count);
343 while (block_bitmap && blk_cnt > 0) {
344 retval = io_channel_read_blk64(fs->image_io, blk++,
345 1, block_bitmap);
346 if (retval)
347 goto cleanup;
348 cnt = fs->blocksize << 3;
349 if (cnt > blk_cnt)
350 cnt = blk_cnt;
351 retval = ext2fs_set_block_bitmap_range2(fs->block_map,
352 blk_itr, cnt, block_bitmap);
353 if (retval)
354 goto cleanup;
355 blk_itr += cnt;
356 blk_cnt -= cnt;
357 }
358 goto cleanup;
359 }
360
361 blk_itr += ((blk64_t)start * (block_nbytes << 3));
362 ino_itr += ((blk64_t)start * (inode_nbytes << 3));
363 for (i = start; i <= end; i++) {
364 if (block_bitmap) {
365 blk = ext2fs_block_bitmap_loc(fs, i);
366 if ((csum_flag &&
367 ext2fs_bg_flags_test(fs, i, EXT2_BG_BLOCK_UNINIT) &&
368 ext2fs_group_desc_csum_verify(fs, i)) ||
369 (blk >= ext2fs_blocks_count(fs->super)))
370 blk = 0;
371 if (blk) {
372 retval = io_channel_read_blk64(fs->io, blk,
373 1, block_bitmap);
374 if (retval) {
375 retval = EXT2_ET_BLOCK_BITMAP_READ;
376 goto cleanup;
377 }
378 /* verify block bitmap checksum */
379 if (!(fs->flags &
380 EXT2_FLAG_IGNORE_CSUM_ERRORS) &&
381 !ext2fs_block_bitmap_csum_verify(fs, i,
382 block_bitmap, block_nbytes)) {
383 retval =
384 EXT2_ET_BLOCK_BITMAP_CSUM_INVALID;
385 goto cleanup;
386 }
387 if (!bitmap_tail_verify((unsigned char *) block_bitmap,
388 block_nbytes, fs->blocksize - 1))
389 *tail_flags |= EXT2_FLAG_BBITMAP_TAIL_PROBLEM;
390 } else
391 memset(block_bitmap, 0, block_nbytes);
392 cnt = block_nbytes << 3;
393 unix_pthread_mutex_lock(mutex);
394 retval = ext2fs_set_block_bitmap_range2(fs->block_map,
395 blk_itr, cnt, block_bitmap);
396 unix_pthread_mutex_unlock(mutex);
397 if (retval)
398 goto cleanup;
399 blk_itr += block_nbytes << 3;
400 }
401 if (inode_bitmap) {
402 blk = ext2fs_inode_bitmap_loc(fs, i);
403 if ((csum_flag &&
404 ext2fs_bg_flags_test(fs, i, EXT2_BG_INODE_UNINIT) &&
405 ext2fs_group_desc_csum_verify(fs, i)) ||
406 (blk >= ext2fs_blocks_count(fs->super)))
407 blk = 0;
408 if (blk) {
409 retval = io_channel_read_blk64(fs->io, blk,
410 1, inode_bitmap);
411 if (retval) {
412 retval = EXT2_ET_INODE_BITMAP_READ;
413 goto cleanup;
414 }
415
416 /* verify inode bitmap checksum */
417 if (!(fs->flags &
418 EXT2_FLAG_IGNORE_CSUM_ERRORS) &&
419 !ext2fs_inode_bitmap_csum_verify(fs, i,
420 inode_bitmap, inode_nbytes)) {
421 retval =
422 EXT2_ET_INODE_BITMAP_CSUM_INVALID;
423 goto cleanup;
424 }
425 if (!bitmap_tail_verify((unsigned char *) inode_bitmap,
426 inode_nbytes, fs->blocksize - 1))
427 *tail_flags |= EXT2_FLAG_IBITMAP_TAIL_PROBLEM;
428 } else
429 memset(inode_bitmap, 0, inode_nbytes);
430 cnt = inode_nbytes << 3;
431 unix_pthread_mutex_lock(mutex);
432 retval = ext2fs_set_inode_bitmap_range2(fs->inode_map,
433 ino_itr, cnt, inode_bitmap);
434 unix_pthread_mutex_unlock(mutex);
435 if (retval)
436 goto cleanup;
437 ino_itr += inode_nbytes << 3;
438 }
439 }
440
441 cleanup:
442 if (inode_bitmap)
443 ext2fs_free_mem(&inode_bitmap);
444 if (block_bitmap)
445 ext2fs_free_mem(&block_bitmap);
446 return retval;
447 }
448
read_bitmaps_range_end(ext2_filsys fs,int flags,int tail_flags)449 static errcode_t read_bitmaps_range_end(ext2_filsys fs, int flags,
450 int tail_flags)
451 {
452 errcode_t retval;
453
454 /* Mark group blocks for any BLOCK_UNINIT groups */
455 if (flags & EXT2FS_BITMAPS_BLOCK) {
456 retval = mark_uninit_bg_group_blocks(fs);
457 if (retval)
458 return retval;
459 fs->flags &= ~EXT2_FLAG_BBITMAP_TAIL_PROBLEM;
460 }
461 if (flags & EXT2FS_BITMAPS_INODE)
462 fs->flags &= ~EXT2_FLAG_IBITMAP_TAIL_PROBLEM;
463 fs->flags |= tail_flags;
464
465 return 0;
466 }
467
read_bitmaps_cleanup_on_error(ext2_filsys fs,int flags)468 static void read_bitmaps_cleanup_on_error(ext2_filsys fs, int flags)
469 {
470 if (flags & EXT2FS_BITMAPS_BLOCK) {
471 ext2fs_free_block_bitmap(fs->block_map);
472 fs->block_map = 0;
473 }
474 if (flags & EXT2FS_BITMAPS_INODE) {
475 ext2fs_free_inode_bitmap(fs->inode_map);
476 fs->inode_map = 0;
477 }
478 }
479
read_bitmaps_range(ext2_filsys fs,int flags,dgrp_t start,dgrp_t end)480 static errcode_t read_bitmaps_range(ext2_filsys fs, int flags,
481 dgrp_t start, dgrp_t end)
482 {
483 errcode_t retval;
484 int tail_flags = 0;
485
486 retval = read_bitmaps_range_prepare(fs, flags);
487 if (retval)
488 return retval;
489
490 retval = read_bitmaps_range_start(fs, flags, start, end,
491 NULL, &tail_flags);
492 if (retval == 0)
493 retval = read_bitmaps_range_end(fs, flags, tail_flags);
494 if (retval)
495 read_bitmaps_cleanup_on_error(fs, flags);
496 return retval;
497 }
498
499 #ifdef HAVE_PTHREAD
500 struct read_bitmaps_thread_info {
501 ext2_filsys rbt_fs;
502 int rbt_flags;
503 dgrp_t rbt_grp_start;
504 dgrp_t rbt_grp_end;
505 errcode_t rbt_retval;
506 pthread_mutex_t *rbt_mutex;
507 int rbt_tail_flags;
508 };
509
read_bitmaps_thread(void * data)510 static void *read_bitmaps_thread(void *data)
511 {
512 struct read_bitmaps_thread_info *rbt = data;
513
514 rbt->rbt_retval = read_bitmaps_range_start(rbt->rbt_fs, rbt->rbt_flags,
515 rbt->rbt_grp_start, rbt->rbt_grp_end,
516 rbt->rbt_mutex, &rbt->rbt_tail_flags);
517 return NULL;
518 }
519 #endif
520
ext2fs_rw_bitmaps(ext2_filsys fs,int flags,int num_threads)521 errcode_t ext2fs_rw_bitmaps(ext2_filsys fs, int flags, int num_threads)
522 {
523 #ifdef HAVE_PTHREAD
524 pthread_attr_t attr;
525 pthread_t *thread_ids = NULL;
526 struct read_bitmaps_thread_info *thread_infos = NULL;
527 pthread_mutex_t rbt_mutex = PTHREAD_MUTEX_INITIALIZER;
528 errcode_t retval;
529 errcode_t rc;
530 unsigned flexbg_size = 1 << fs->super->s_log_groups_per_flex;
531 dgrp_t average_group;
532 int i, tail_flags = 0;
533 #endif
534
535 if (flags & ~EXT2FS_BITMAPS_VALID_FLAGS)
536 return EXT2_ET_INVALID_ARGUMENT;
537
538 if (flags & EXT2FS_BITMAPS_WRITE)
539 return write_bitmaps(fs, flags & EXT2FS_BITMAPS_INODE,
540 flags & EXT2FS_BITMAPS_BLOCK);
541
542 #ifdef HAVE_PTHREAD
543 if (((fs->io->flags & CHANNEL_FLAGS_THREADS) == 0) ||
544 (num_threads == 1) || (fs->flags & EXT2_FLAG_IMAGE_FILE))
545 goto fallback;
546
547 #if defined(HAVE_SYSCONF) && defined(_SC_NPROCESSORS_CONF)
548 if (num_threads < 0)
549 num_threads = sysconf(_SC_NPROCESSORS_CONF);
550 #endif
551 /*
552 * Guess for now; eventually we should probably define
553 * ext2fs_get_num_cpus() and teach it how to get this info on
554 * MacOS, FreeBSD, etc.
555 * ref: https://stackoverflow.com/questions/150355
556 */
557 if (num_threads < 0)
558 num_threads = 4;
559
560 if ((unsigned) num_threads > fs->group_desc_count)
561 num_threads = fs->group_desc_count;
562 average_group = fs->group_desc_count / num_threads;
563 if (ext2fs_has_feature_flex_bg(fs->super)) {
564 average_group = (average_group / flexbg_size) * flexbg_size;
565 }
566 if ((num_threads <= 1) || (average_group == 0))
567 goto fallback;
568
569 io_channel_set_options(fs->io, "cache=off");
570 retval = pthread_attr_init(&attr);
571 if (retval)
572 return retval;
573
574 thread_ids = calloc(sizeof(pthread_t), num_threads);
575 if (!thread_ids)
576 return ENOMEM;
577
578 thread_infos = calloc(sizeof(struct read_bitmaps_thread_info),
579 num_threads);
580 if (!thread_infos)
581 goto out;
582
583 retval = read_bitmaps_range_prepare(fs, flags);
584 if (retval)
585 goto out;
586
587 // fprintf(stdout, "Multiple threads triggered to read bitmaps\n");
588 for (i = 0; i < num_threads; i++) {
589 thread_infos[i].rbt_fs = fs;
590 thread_infos[i].rbt_flags = flags;
591 thread_infos[i].rbt_mutex = &rbt_mutex;
592 thread_infos[i].rbt_tail_flags = 0;
593 if (i == 0)
594 thread_infos[i].rbt_grp_start = 0;
595 else
596 thread_infos[i].rbt_grp_start = average_group * i + 1;
597
598 if (i == num_threads - 1)
599 thread_infos[i].rbt_grp_end = fs->group_desc_count - 1;
600 else
601 thread_infos[i].rbt_grp_end = average_group * (i + 1);
602 retval = pthread_create(&thread_ids[i], &attr,
603 &read_bitmaps_thread, &thread_infos[i]);
604 if (retval)
605 break;
606 }
607 for (i = 0; i < num_threads; i++) {
608 if (!thread_ids[i])
609 break;
610 rc = pthread_join(thread_ids[i], NULL);
611 if (rc && !retval)
612 retval = rc;
613 rc = thread_infos[i].rbt_retval;
614 if (rc && !retval)
615 retval = rc;
616 tail_flags |= thread_infos[i].rbt_tail_flags;
617 }
618 out:
619 rc = pthread_attr_destroy(&attr);
620 if (rc && !retval)
621 retval = rc;
622 free(thread_infos);
623 free(thread_ids);
624
625 if (retval == 0)
626 retval = read_bitmaps_range_end(fs, flags, tail_flags);
627 if (retval)
628 read_bitmaps_cleanup_on_error(fs, flags);
629 /* XXX should save and restore cache setting */
630 io_channel_set_options(fs->io, "cache=on");
631 return retval;
632 fallback:
633 #endif /* HAVE_PTHREAD */
634 return read_bitmaps_range(fs, flags, 0, fs->group_desc_count - 1);
635 }
636
ext2fs_read_inode_bitmap(ext2_filsys fs)637 errcode_t ext2fs_read_inode_bitmap(ext2_filsys fs)
638 {
639 return ext2fs_rw_bitmaps(fs, EXT2FS_BITMAPS_INODE, -1);
640 }
641
ext2fs_read_block_bitmap(ext2_filsys fs)642 errcode_t ext2fs_read_block_bitmap(ext2_filsys fs)
643 {
644 return ext2fs_rw_bitmaps(fs, EXT2FS_BITMAPS_BLOCK, -1);
645 }
646
ext2fs_write_inode_bitmap(ext2_filsys fs)647 errcode_t ext2fs_write_inode_bitmap(ext2_filsys fs)
648 {
649 return write_bitmaps(fs, 1, 0);
650 }
651
ext2fs_write_block_bitmap(ext2_filsys fs)652 errcode_t ext2fs_write_block_bitmap (ext2_filsys fs)
653 {
654 return write_bitmaps(fs, 0, 1);
655 }
656
ext2fs_read_bitmaps(ext2_filsys fs)657 errcode_t ext2fs_read_bitmaps(ext2_filsys fs)
658 {
659 int flags = 0;
660
661 if (!fs->inode_map)
662 flags |= EXT2FS_BITMAPS_INODE;
663 if (!fs->block_map)
664 flags |= EXT2FS_BITMAPS_BLOCK;
665 if (flags == 0)
666 return 0;
667 return ext2fs_rw_bitmaps(fs, flags, -1);
668 }
669
ext2fs_write_bitmaps(ext2_filsys fs)670 errcode_t ext2fs_write_bitmaps(ext2_filsys fs)
671 {
672 int do_inode = fs->inode_map && ext2fs_test_ib_dirty(fs);
673 int do_block = fs->block_map && ext2fs_test_bb_dirty(fs);
674
675 if (!do_inode && !do_block)
676 return 0;
677
678 return write_bitmaps(fs, do_inode, do_block);
679 }
680