aboutsummaryrefslogtreecommitdiff
path: root/fs/yaffs2/yaffs_verify.c
blob: 3fef28bdcb08e0acf535e184107a1288a72f3c46 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
/*
 * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
 *
 * Copyright (C) 2002-2011 Aleph One Ltd.
 *   for Toby Churchill Ltd and Brightstar Engineering
 *
 * Created by Charles Manning <charles@aleph1.co.uk>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include "yaffs_verify.h"
#include "yaffs_trace.h"
#include "yaffs_bitmap.h"
#include "yaffs_getblockinfo.h"
#include "yaffs_nand.h"

int yaffs_skip_verification(struct yaffs_dev *dev)
{
	return !(yaffs_trace_mask &
		 (YAFFS_TRACE_VERIFY | YAFFS_TRACE_VERIFY_FULL));
}

static int yaffs_skip_full_verification(struct yaffs_dev *dev)
{
	return !(yaffs_trace_mask & (YAFFS_TRACE_VERIFY_FULL));
}

static int yaffs_skip_nand_verification(struct yaffs_dev *dev)
{
	return !(yaffs_trace_mask & (YAFFS_TRACE_VERIFY_NAND));
}

static const char * const block_state_name[] = {
	"Unknown",
	"Needs scan",
	"Scanning",
	"Empty",
	"Allocating",
	"Full",
	"Dirty",
	"Checkpoint",
	"Collecting",
	"Dead"
};

void yaffs_verify_blk(struct yaffs_dev *dev, struct yaffs_block_info *bi, int n)
{
	int actually_used;
	int in_use;

	if (yaffs_skip_verification(dev))
		return;

	/* Report illegal runtime states */
	if (bi->block_state >= YAFFS_NUMBER_OF_BLOCK_STATES)
		yaffs_trace(YAFFS_TRACE_VERIFY,
			"Block %d has undefined state %d",
			n, bi->block_state);

	switch (bi->block_state) {
	case YAFFS_BLOCK_STATE_UNKNOWN:
	case YAFFS_BLOCK_STATE_SCANNING:
	case YAFFS_BLOCK_STATE_NEEDS_SCAN:
		yaffs_trace(YAFFS_TRACE_VERIFY,
			"Block %d has bad run-state %s",
			n, block_state_name[bi->block_state]);
	}

	/* Check pages in use and soft deletions are legal */

	actually_used = bi->pages_in_use - bi->soft_del_pages;

	if (bi->pages_in_use < 0 ||
	    bi->pages_in_use > dev->param.chunks_per_block ||
	    bi->soft_del_pages < 0 ||
	    bi->soft_del_pages > dev->param.chunks_per_block ||
	    actually_used < 0 || actually_used > dev->param.chunks_per_block)
		yaffs_trace(YAFFS_TRACE_VERIFY,
			"Block %d has illegal values pages_in_used %d soft_del_pages %d",
			n, bi->pages_in_use, bi->soft_del_pages);

	/* Check chunk bitmap legal */
	in_use = yaffs_count_chunk_bits(dev, n);
	if (in_use != bi->pages_in_use)
		yaffs_trace(YAFFS_TRACE_VERIFY,
			"Block %d has inconsistent values pages_in_use %d counted chunk bits %d",
			n, bi->pages_in_use, in_use);
}

void yaffs_verify_collected_blk(struct yaffs_dev *dev,
				struct yaffs_block_info *bi, int n)
{
	yaffs_verify_blk(dev, bi, n);

	/* After collection the block should be in the erased state */

	if (bi->block_state != YAFFS_BLOCK_STATE_COLLECTING &&
	    bi->block_state != YAFFS_BLOCK_STATE_EMPTY) {
		yaffs_trace(YAFFS_TRACE_ERROR,
			"Block %d is in state %d after gc, should be erased",
			n, bi->block_state);
	}
}

void yaffs_verify_blocks(struct yaffs_dev *dev)
{
	int i;
	int state_count[YAFFS_NUMBER_OF_BLOCK_STATES];
	int illegal_states = 0;

	if (yaffs_skip_verification(dev))
		return;

	memset(state_count, 0, sizeof(state_count));

	for (i = dev->internal_start_block; i <= dev->internal_end_block; i++) {
		struct yaffs_block_info *bi = yaffs_get_block_info(dev, i);
		yaffs_verify_blk(dev, bi, i);

		if (bi->block_state < YAFFS_NUMBER_OF_BLOCK_STATES)
			state_count[bi->block_state]++;
		else
			illegal_states++;
	}

	yaffs_trace(YAFFS_TRACE_VERIFY,	"Block summary");

	yaffs_trace(YAFFS_TRACE_VERIFY,
		"%d blocks have illegal states",
		illegal_states);
	if (state_count[YAFFS_BLOCK_STATE_ALLOCATING] > 1)
		yaffs_trace(YAFFS_TRACE_VERIFY,
			"Too many allocating blocks");

	for (i = 0; i < YAFFS_NUMBER_OF_BLOCK_STATES; i++)
		yaffs_trace(YAFFS_TRACE_VERIFY,
			"%s %d blocks",
			block_state_name[i], state_count[i]);

	if (dev->blocks_in_checkpt != state_count[YAFFS_BLOCK_STATE_CHECKPOINT])
		yaffs_trace(YAFFS_TRACE_VERIFY,
			"Checkpoint block count wrong dev %d count %d",
			dev->blocks_in_checkpt,
			state_count[YAFFS_BLOCK_STATE_CHECKPOINT]);

	if (dev->n_erased_blocks != state_count[YAFFS_BLOCK_STATE_EMPTY])
		yaffs_trace(YAFFS_TRACE_VERIFY,
			"Erased block count wrong dev %d count %d",
			dev->n_erased_blocks,
			state_count[YAFFS_BLOCK_STATE_EMPTY]);

	if (state_count[YAFFS_BLOCK_STATE_COLLECTING] > 1)
		yaffs_trace(YAFFS_TRACE_VERIFY,
			"Too many collecting blocks %d (max is 1)",
			state_count[YAFFS_BLOCK_STATE_COLLECTING]);
}

/*
 * Verify the object header. oh must be valid, but obj and tags may be NULL in
 * which case those tests will not be performed.
 */
void yaffs_verify_oh(struct yaffs_obj *obj, struct yaffs_obj_hdr *oh,
		     struct yaffs_ext_tags *tags, int parent_check)
{
	if (obj && yaffs_skip_verification(obj->my_dev))
		return;

	if (!(tags && obj && oh)) {
		yaffs_trace(YAFFS_TRACE_VERIFY,
			"Verifying object header tags %p obj %p oh %p",
			tags, obj, oh);
		return;
	}

	if (oh->type <= YAFFS_OBJECT_TYPE_UNKNOWN ||
	    oh->type > YAFFS_OBJECT_TYPE_MAX)
		yaffs_trace(YAFFS_TRACE_VERIFY,
			"Obj %d header type is illegal value 0x%x",
			tags->obj_id, oh->type);

	if (tags->obj_id != obj->obj_id)
		yaffs_trace(YAFFS_TRACE_VERIFY,
			"Obj %d header mismatch obj_id %d",
			tags->obj_id, obj->obj_id);

	/*
	 * Check that the object's parent ids match if parent_check requested.
	 *
	 * Tests do not apply to the root object.
	 */

	if (parent_check && tags->obj_id > 1 && !obj->parent)
		yaffs_trace(YAFFS_TRACE_VERIFY,
			"Obj %d header mismatch parent_id %d obj->parent is NULL",
			tags->obj_id, oh->parent_obj_id);

	if (parent_check && obj->parent &&
	    oh->parent_obj_id != obj->parent->obj_id &&
	    (oh->parent_obj_id != YAFFS_OBJECTID_UNLINKED ||
	     obj->parent->obj_id != YAFFS_OBJECTID_DELETED))
		yaffs_trace(YAFFS_TRACE_VERIFY,
			"Obj %d header mismatch parent_id %d parent_obj_id %d",
			tags->obj_id, oh->parent_obj_id,
			obj->parent->obj_id);

	if (tags->obj_id > 1 && oh->name[0] == 0)	/* Null name */
		yaffs_trace(YAFFS_TRACE_VERIFY,
			"Obj %d header name is NULL",
			obj->obj_id);

	if (tags->obj_id > 1 && ((u8) (oh->name[0])) == 0xff)	/* Junk name */
		yaffs_trace(YAFFS_TRACE_VERIFY,
			"Obj %d header name is 0xff",
			obj->obj_id);
}

void yaffs_verify_file(struct yaffs_obj *obj)
{
	u32 x;
	int required_depth;
	int last_chunk;
	u32 offset_in_chunk;
	u32 the_chunk;

	u32 i;
	struct yaffs_dev *dev;
	struct yaffs_ext_tags tags;
	struct yaffs_tnode *tn;
	u32 obj_id;

	if (!obj)
		return;

	if (yaffs_skip_verification(obj->my_dev))
		return;

	dev = obj->my_dev;
	obj_id = obj->obj_id;


	/* Check file size is consistent with tnode depth */
	yaffs_addr_to_chunk(dev, obj->variant.file_variant.file_size,
				&last_chunk, &offset_in_chunk);
	last_chunk++;
	x = last_chunk >> YAFFS_TNODES_LEVEL0_BITS;
	required_depth = 0;
	while (x > 0) {
		x >>= YAFFS_TNODES_INTERNAL_BITS;
		required_depth++;
	}

	/* Check that the chunks in the tnode tree are all correct.
	 * We do this by scanning through the tnode tree and
	 * checking the tags for every chunk match.
	 */

	if (yaffs_skip_nand_verification(dev))
		return;

	for (i = 1; i <= last_chunk; i++) {
		tn = yaffs_find_tnode_0(dev, &obj->variant.file_variant, i);

		if (!tn)
			continue;

		the_chunk = yaffs_get_group_base(dev, tn, i);
		if (the_chunk > 0) {
			yaffs_rd_chunk_tags_nand(dev, the_chunk, NULL,
						 &tags);
			if (tags.obj_id != obj_id || tags.chunk_id != i)
				yaffs_trace(YAFFS_TRACE_VERIFY,
					"Object %d chunk_id %d NAND mismatch chunk %d tags (%d:%d)",
					obj_id, i, the_chunk,
					tags.obj_id, tags.chunk_id);
		}
	}
}

void yaffs_verify_link(struct yaffs_obj *obj)
{
	if (obj && yaffs_skip_verification(obj->my_dev))
		return;

	/* Verify sane equivalent object */
}

void yaffs_verify_symlink(struct yaffs_obj *obj)
{
	if (obj && yaffs_skip_verification(obj->my_dev))
		return;

	/* Verify symlink string */
}

void yaffs_verify_special(struct yaffs_obj *obj)
{
	if (obj && yaffs_skip_verification(obj->my_dev))
		return;
}

void yaffs_verify_obj(struct yaffs_obj *obj)
{
	struct yaffs_dev *dev;
	u32 chunk_min;
	u32 chunk_max;
	u32 chunk_id_ok;
	u32 chunk_in_range;
	u32 chunk_wrongly_deleted;
	u32 chunk_valid;

	if (!obj)
		return;

	if (obj->being_created)
		return;

	dev = obj->my_dev;

	if (yaffs_skip_verification(dev))
		return;

	/* Check sane object header chunk */

	chunk_min = dev->internal_start_block * dev->param.chunks_per_block;
	chunk_max =
	    (dev->internal_end_block + 1) * dev->param.chunks_per_block - 1;

	chunk_in_range = (((unsigned)(obj->hdr_chunk)) >= chunk_min &&
			  ((unsigned)(obj->hdr_chunk)) <= chunk_max);
	chunk_id_ok = chunk_in_range || (obj->hdr_chunk == 0);
	chunk_valid = chunk_in_range &&
	    yaffs_check_chunk_bit(dev,
				  obj->hdr_chunk / dev->param.chunks_per_block,
				  obj->hdr_chunk % dev->param.chunks_per_block);
	chunk_wrongly_deleted = chunk_in_range && !chunk_valid;

	if (!obj->fake && (!chunk_id_ok || chunk_wrongly_deleted))
		yaffs_trace(YAFFS_TRACE_VERIFY,
			"Obj %d has chunk_id %d %s %s",
			obj->obj_id, obj->hdr_chunk,
			chunk_id_ok ? "" : ",out of range",
			chunk_wrongly_deleted ? ",marked as deleted" : "");

	if (chunk_valid && !yaffs_skip_nand_verification(dev)) {
		struct yaffs_ext_tags tags;
		struct yaffs_obj_hdr *oh;
		u8 *buffer = yaffs_get_temp_buffer(dev);

		oh = (struct yaffs_obj_hdr *)buffer;

		yaffs_rd_chunk_tags_nand(dev, obj->hdr_chunk, buffer, &tags);

		yaffs_verify_oh(obj, oh, &tags, 1);

		yaffs_release_temp_buffer(dev, buffer);
	}

	/* Verify it has a parent */
	if (obj && !obj->fake && (!obj->parent || obj->parent->my_dev != dev)) {
		yaffs_trace(YAFFS_TRACE_VERIFY,
			"Obj %d has parent pointer %p which does not look like an object",
			obj->obj_id, obj->parent);
	}

	/* Verify parent is a directory */
	if (obj->parent &&
	    obj->parent->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
		yaffs_trace(YAFFS_TRACE_VERIFY,
			"Obj %d's parent is not a directory (type %d)",
			obj->obj_id, obj->parent->variant_type);
	}

	switch (obj->variant_type) {
	case YAFFS_OBJECT_TYPE_FILE:
		yaffs_verify_file(obj);
		break;
	case YAFFS_OBJECT_TYPE_SYMLINK:
		yaffs_verify_symlink(obj);
		break;
	case YAFFS_OBJECT_TYPE_DIRECTORY:
		yaffs_verify_dir(obj);
		break;
	case YAFFS_OBJECT_TYPE_HARDLINK:
		yaffs_verify_link(obj);
		break;
	case YAFFS_OBJECT_TYPE_SPECIAL:
		yaffs_verify_special(obj);
		break;
	case YAFFS_OBJECT_TYPE_UNKNOWN:
	default:
		yaffs_trace(YAFFS_TRACE_VERIFY,
			"Obj %d has illegaltype %d",
		   obj->obj_id, obj->variant_type);
		break;
	}
}

void yaffs_verify_objects(struct yaffs_dev *dev)
{
	struct yaffs_obj *obj;
	int i;
	struct list_head *lh;

	if (yaffs_skip_verification(dev))
		return;

	/* Iterate through the objects in each hash entry */

	for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
		list_for_each(lh, &dev->obj_bucket[i].list) {
			obj = list_entry(lh, struct yaffs_obj, hash_link);
			yaffs_verify_obj(obj);
		}
	}
}

void yaffs_verify_obj_in_dir(struct yaffs_obj *obj)
{
	struct list_head *lh;
	struct yaffs_obj *list_obj;
	int count = 0;

	if (!obj) {
		yaffs_trace(YAFFS_TRACE_ALWAYS, "No object to verify");
		BUG();
		return;
	}

	if (yaffs_skip_verification(obj->my_dev))
		return;

	if (!obj->parent) {
		yaffs_trace(YAFFS_TRACE_ALWAYS, "Object does not have parent");
		BUG();
		return;
	}

	if (obj->parent->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
		yaffs_trace(YAFFS_TRACE_ALWAYS, "Parent is not directory");
		BUG();
	}

	/* Iterate through the objects in each hash entry */

	list_for_each(lh, &obj->parent->variant.dir_variant.children) {
		list_obj = list_entry(lh, struct yaffs_obj, siblings);
		yaffs_verify_obj(list_obj);
		if (obj == list_obj)
			count++;
	}

	if (count != 1) {
		yaffs_trace(YAFFS_TRACE_ALWAYS,
			"Object in directory %d times",
			count);
		BUG();
	}
}

void yaffs_verify_dir(struct yaffs_obj *directory)
{
	struct list_head *lh;
	struct yaffs_obj *list_obj;

	if (!directory) {
		BUG();
		return;
	}

	if (yaffs_skip_full_verification(directory->my_dev))
		return;

	if (directory->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
		yaffs_trace(YAFFS_TRACE_ALWAYS,
			"Directory has wrong type: %d",
			directory->variant_type);
		BUG();
	}

	/* Iterate through the objects in each hash entry */

	list_for_each(lh, &directory->variant.dir_variant.children) {
		list_obj = list_entry(lh, struct yaffs_obj, siblings);
		if (list_obj->parent != directory) {
			yaffs_trace(YAFFS_TRACE_ALWAYS,
				"Object in directory list has wrong parent %p",
				list_obj->parent);
			BUG();
		}
		yaffs_verify_obj_in_dir(list_obj);
	}
}

static int yaffs_free_verification_failures;

void yaffs_verify_free_chunks(struct yaffs_dev *dev)
{
	int counted;
	int difference;

	if (yaffs_skip_verification(dev))
		return;

	counted = yaffs_count_free_chunks(dev);

	difference = dev->n_free_chunks - counted;

	if (difference) {
		yaffs_trace(YAFFS_TRACE_ALWAYS,
			"Freechunks verification failure %d %d %d",
			dev->n_free_chunks, counted, difference);
		yaffs_free_verification_failures++;
	}
}

int yaffs_verify_file_sane(struct yaffs_obj *in)
{
	return YAFFS_OK;
}