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-rw-r--r--fs/yaffs2/yaffs_verify.c535
1 files changed, 535 insertions, 0 deletions
diff --git a/fs/yaffs2/yaffs_verify.c b/fs/yaffs2/yaffs_verify.c
new file mode 100644
index 00000000000..738c7f69a5e
--- /dev/null
+++ b/fs/yaffs2/yaffs_verify.c
@@ -0,0 +1,535 @@
1/*
2 * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
3 *
4 * Copyright (C) 2002-2010 Aleph One Ltd.
5 * for Toby Churchill Ltd and Brightstar Engineering
6 *
7 * Created by Charles Manning <charles@aleph1.co.uk>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13
14#include "yaffs_verify.h"
15#include "yaffs_trace.h"
16#include "yaffs_bitmap.h"
17#include "yaffs_getblockinfo.h"
18#include "yaffs_nand.h"
19
20int yaffs_skip_verification(struct yaffs_dev *dev)
21{
22 dev = dev;
23 return !(yaffs_trace_mask &
24 (YAFFS_TRACE_VERIFY | YAFFS_TRACE_VERIFY_FULL));
25}
26
27static int yaffs_skip_full_verification(struct yaffs_dev *dev)
28{
29 dev = dev;
30 return !(yaffs_trace_mask & (YAFFS_TRACE_VERIFY_FULL));
31}
32
33static int yaffs_skip_nand_verification(struct yaffs_dev *dev)
34{
35 dev = dev;
36 return !(yaffs_trace_mask & (YAFFS_TRACE_VERIFY_NAND));
37}
38
39static const char *block_state_name[] = {
40 "Unknown",
41 "Needs scanning",
42 "Scanning",
43 "Empty",
44 "Allocating",
45 "Full",
46 "Dirty",
47 "Checkpoint",
48 "Collecting",
49 "Dead"
50};
51
52void yaffs_verify_blk(struct yaffs_dev *dev, struct yaffs_block_info *bi, int n)
53{
54 int actually_used;
55 int in_use;
56
57 if (yaffs_skip_verification(dev))
58 return;
59
60 /* Report illegal runtime states */
61 if (bi->block_state >= YAFFS_NUMBER_OF_BLOCK_STATES)
62 yaffs_trace(YAFFS_TRACE_VERIFY,
63 "Block %d has undefined state %d",
64 n, bi->block_state);
65
66 switch (bi->block_state) {
67 case YAFFS_BLOCK_STATE_UNKNOWN:
68 case YAFFS_BLOCK_STATE_SCANNING:
69 case YAFFS_BLOCK_STATE_NEEDS_SCANNING:
70 yaffs_trace(YAFFS_TRACE_VERIFY,
71 "Block %d has bad run-state %s",
72 n, block_state_name[bi->block_state]);
73 }
74
75 /* Check pages in use and soft deletions are legal */
76
77 actually_used = bi->pages_in_use - bi->soft_del_pages;
78
79 if (bi->pages_in_use < 0
80 || bi->pages_in_use > dev->param.chunks_per_block
81 || bi->soft_del_pages < 0
82 || bi->soft_del_pages > dev->param.chunks_per_block
83 || actually_used < 0 || actually_used > dev->param.chunks_per_block)
84 yaffs_trace(YAFFS_TRACE_VERIFY,
85 "Block %d has illegal values pages_in_used %d soft_del_pages %d",
86 n, bi->pages_in_use, bi->soft_del_pages);
87
88 /* Check chunk bitmap legal */
89 in_use = yaffs_count_chunk_bits(dev, n);
90 if (in_use != bi->pages_in_use)
91 yaffs_trace(YAFFS_TRACE_VERIFY,
92 "Block %d has inconsistent values pages_in_use %d counted chunk bits %d",
93 n, bi->pages_in_use, in_use);
94
95}
96
97void yaffs_verify_collected_blk(struct yaffs_dev *dev,
98 struct yaffs_block_info *bi, int n)
99{
100 yaffs_verify_blk(dev, bi, n);
101
102 /* After collection the block should be in the erased state */
103
104 if (bi->block_state != YAFFS_BLOCK_STATE_COLLECTING &&
105 bi->block_state != YAFFS_BLOCK_STATE_EMPTY) {
106 yaffs_trace(YAFFS_TRACE_ERROR,
107 "Block %d is in state %d after gc, should be erased",
108 n, bi->block_state);
109 }
110}
111
112void yaffs_verify_blocks(struct yaffs_dev *dev)
113{
114 int i;
115 int state_count[YAFFS_NUMBER_OF_BLOCK_STATES];
116 int illegal_states = 0;
117
118 if (yaffs_skip_verification(dev))
119 return;
120
121 memset(state_count, 0, sizeof(state_count));
122
123 for (i = dev->internal_start_block; i <= dev->internal_end_block; i++) {
124 struct yaffs_block_info *bi = yaffs_get_block_info(dev, i);
125 yaffs_verify_blk(dev, bi, i);
126
127 if (bi->block_state < YAFFS_NUMBER_OF_BLOCK_STATES)
128 state_count[bi->block_state]++;
129 else
130 illegal_states++;
131 }
132
133 yaffs_trace(YAFFS_TRACE_VERIFY, "Block summary");
134
135 yaffs_trace(YAFFS_TRACE_VERIFY,
136 "%d blocks have illegal states",
137 illegal_states);
138 if (state_count[YAFFS_BLOCK_STATE_ALLOCATING] > 1)
139 yaffs_trace(YAFFS_TRACE_VERIFY,
140 "Too many allocating blocks");
141
142 for (i = 0; i < YAFFS_NUMBER_OF_BLOCK_STATES; i++)
143 yaffs_trace(YAFFS_TRACE_VERIFY,
144 "%s %d blocks",
145 block_state_name[i], state_count[i]);
146
147 if (dev->blocks_in_checkpt != state_count[YAFFS_BLOCK_STATE_CHECKPOINT])
148 yaffs_trace(YAFFS_TRACE_VERIFY,
149 "Checkpoint block count wrong dev %d count %d",
150 dev->blocks_in_checkpt,
151 state_count[YAFFS_BLOCK_STATE_CHECKPOINT]);
152
153 if (dev->n_erased_blocks != state_count[YAFFS_BLOCK_STATE_EMPTY])
154 yaffs_trace(YAFFS_TRACE_VERIFY,
155 "Erased block count wrong dev %d count %d",
156 dev->n_erased_blocks,
157 state_count[YAFFS_BLOCK_STATE_EMPTY]);
158
159 if (state_count[YAFFS_BLOCK_STATE_COLLECTING] > 1)
160 yaffs_trace(YAFFS_TRACE_VERIFY,
161 "Too many collecting blocks %d (max is 1)",
162 state_count[YAFFS_BLOCK_STATE_COLLECTING]);
163}
164
165/*
166 * Verify the object header. oh must be valid, but obj and tags may be NULL in which
167 * case those tests will not be performed.
168 */
169void yaffs_verify_oh(struct yaffs_obj *obj, struct yaffs_obj_hdr *oh,
170 struct yaffs_ext_tags *tags, int parent_check)
171{
172 if (obj && yaffs_skip_verification(obj->my_dev))
173 return;
174
175 if (!(tags && obj && oh)) {
176 yaffs_trace(YAFFS_TRACE_VERIFY,
177 "Verifying object header tags %p obj %p oh %p",
178 tags, obj, oh);
179 return;
180 }
181
182 if (oh->type <= YAFFS_OBJECT_TYPE_UNKNOWN ||
183 oh->type > YAFFS_OBJECT_TYPE_MAX)
184 yaffs_trace(YAFFS_TRACE_VERIFY,
185 "Obj %d header type is illegal value 0x%x",
186 tags->obj_id, oh->type);
187
188 if (tags->obj_id != obj->obj_id)
189 yaffs_trace(YAFFS_TRACE_VERIFY,
190 "Obj %d header mismatch obj_id %d",
191 tags->obj_id, obj->obj_id);
192
193 /*
194 * Check that the object's parent ids match if parent_check requested.
195 *
196 * Tests do not apply to the root object.
197 */
198
199 if (parent_check && tags->obj_id > 1 && !obj->parent)
200 yaffs_trace(YAFFS_TRACE_VERIFY,
201 "Obj %d header mismatch parent_id %d obj->parent is NULL",
202 tags->obj_id, oh->parent_obj_id);
203
204 if (parent_check && obj->parent &&
205 oh->parent_obj_id != obj->parent->obj_id &&
206 (oh->parent_obj_id != YAFFS_OBJECTID_UNLINKED ||
207 obj->parent->obj_id != YAFFS_OBJECTID_DELETED))
208 yaffs_trace(YAFFS_TRACE_VERIFY,
209 "Obj %d header mismatch parent_id %d parent_obj_id %d",
210 tags->obj_id, oh->parent_obj_id,
211 obj->parent->obj_id);
212
213 if (tags->obj_id > 1 && oh->name[0] == 0) /* Null name */
214 yaffs_trace(YAFFS_TRACE_VERIFY,
215 "Obj %d header name is NULL",
216 obj->obj_id);
217
218 if (tags->obj_id > 1 && ((u8) (oh->name[0])) == 0xff) /* Trashed name */
219 yaffs_trace(YAFFS_TRACE_VERIFY,
220 "Obj %d header name is 0xFF",
221 obj->obj_id);
222}
223
224void yaffs_verify_file(struct yaffs_obj *obj)
225{
226 int required_depth;
227 int actual_depth;
228 u32 last_chunk;
229 u32 x;
230 u32 i;
231 struct yaffs_dev *dev;
232 struct yaffs_ext_tags tags;
233 struct yaffs_tnode *tn;
234 u32 obj_id;
235
236 if (!obj)
237 return;
238
239 if (yaffs_skip_verification(obj->my_dev))
240 return;
241
242 dev = obj->my_dev;
243 obj_id = obj->obj_id;
244
245 /* Check file size is consistent with tnode depth */
246 last_chunk =
247 obj->variant.file_variant.file_size / dev->data_bytes_per_chunk + 1;
248 x = last_chunk >> YAFFS_TNODES_LEVEL0_BITS;
249 required_depth = 0;
250 while (x > 0) {
251 x >>= YAFFS_TNODES_INTERNAL_BITS;
252 required_depth++;
253 }
254
255 actual_depth = obj->variant.file_variant.top_level;
256
257 /* Check that the chunks in the tnode tree are all correct.
258 * We do this by scanning through the tnode tree and
259 * checking the tags for every chunk match.
260 */
261
262 if (yaffs_skip_nand_verification(dev))
263 return;
264
265 for (i = 1; i <= last_chunk; i++) {
266 tn = yaffs_find_tnode_0(dev, &obj->variant.file_variant, i);
267
268 if (tn) {
269 u32 the_chunk = yaffs_get_group_base(dev, tn, i);
270 if (the_chunk > 0) {
271 yaffs_rd_chunk_tags_nand(dev, the_chunk, NULL,
272 &tags);
273 if (tags.obj_id != obj_id || tags.chunk_id != i)
274 yaffs_trace(YAFFS_TRACE_VERIFY,
275 "Object %d chunk_id %d NAND mismatch chunk %d tags (%d:%d)",
276 obj_id, i, the_chunk,
277 tags.obj_id, tags.chunk_id);
278 }
279 }
280 }
281}
282
283void yaffs_verify_link(struct yaffs_obj *obj)
284{
285 if (obj && yaffs_skip_verification(obj->my_dev))
286 return;
287
288 /* Verify sane equivalent object */
289}
290
291void yaffs_verify_symlink(struct yaffs_obj *obj)
292{
293 if (obj && yaffs_skip_verification(obj->my_dev))
294 return;
295
296 /* Verify symlink string */
297}
298
299void yaffs_verify_special(struct yaffs_obj *obj)
300{
301 if (obj && yaffs_skip_verification(obj->my_dev))
302 return;
303}
304
305void yaffs_verify_obj(struct yaffs_obj *obj)
306{
307 struct yaffs_dev *dev;
308
309 u32 chunk_min;
310 u32 chunk_max;
311
312 u32 chunk_id_ok;
313 u32 chunk_in_range;
314 u32 chunk_wrongly_deleted;
315 u32 chunk_valid;
316
317 if (!obj)
318 return;
319
320 if (obj->being_created)
321 return;
322
323 dev = obj->my_dev;
324
325 if (yaffs_skip_verification(dev))
326 return;
327
328 /* Check sane object header chunk */
329
330 chunk_min = dev->internal_start_block * dev->param.chunks_per_block;
331 chunk_max =
332 (dev->internal_end_block + 1) * dev->param.chunks_per_block - 1;
333
334 chunk_in_range = (((unsigned)(obj->hdr_chunk)) >= chunk_min &&
335 ((unsigned)(obj->hdr_chunk)) <= chunk_max);
336 chunk_id_ok = chunk_in_range || (obj->hdr_chunk == 0);
337 chunk_valid = chunk_in_range &&
338 yaffs_check_chunk_bit(dev,
339 obj->hdr_chunk / dev->param.chunks_per_block,
340 obj->hdr_chunk % dev->param.chunks_per_block);
341 chunk_wrongly_deleted = chunk_in_range && !chunk_valid;
342
343 if (!obj->fake && (!chunk_id_ok || chunk_wrongly_deleted))
344 yaffs_trace(YAFFS_TRACE_VERIFY,
345 "Obj %d has chunk_id %d %s %s",
346 obj->obj_id, obj->hdr_chunk,
347 chunk_id_ok ? "" : ",out of range",
348 chunk_wrongly_deleted ? ",marked as deleted" : "");
349
350 if (chunk_valid && !yaffs_skip_nand_verification(dev)) {
351 struct yaffs_ext_tags tags;
352 struct yaffs_obj_hdr *oh;
353 u8 *buffer = yaffs_get_temp_buffer(dev, __LINE__);
354
355 oh = (struct yaffs_obj_hdr *)buffer;
356
357 yaffs_rd_chunk_tags_nand(dev, obj->hdr_chunk, buffer, &tags);
358
359 yaffs_verify_oh(obj, oh, &tags, 1);
360
361 yaffs_release_temp_buffer(dev, buffer, __LINE__);
362 }
363
364 /* Verify it has a parent */
365 if (obj && !obj->fake && (!obj->parent || obj->parent->my_dev != dev)) {
366 yaffs_trace(YAFFS_TRACE_VERIFY,
367 "Obj %d has parent pointer %p which does not look like an object",
368 obj->obj_id, obj->parent);
369 }
370
371 /* Verify parent is a directory */
372 if (obj->parent
373 && obj->parent->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
374 yaffs_trace(YAFFS_TRACE_VERIFY,
375 "Obj %d's parent is not a directory (type %d)",
376 obj->obj_id, obj->parent->variant_type);
377 }
378
379 switch (obj->variant_type) {
380 case YAFFS_OBJECT_TYPE_FILE:
381 yaffs_verify_file(obj);
382 break;
383 case YAFFS_OBJECT_TYPE_SYMLINK:
384 yaffs_verify_symlink(obj);
385 break;
386 case YAFFS_OBJECT_TYPE_DIRECTORY:
387 yaffs_verify_dir(obj);
388 break;
389 case YAFFS_OBJECT_TYPE_HARDLINK:
390 yaffs_verify_link(obj);
391 break;
392 case YAFFS_OBJECT_TYPE_SPECIAL:
393 yaffs_verify_special(obj);
394 break;
395 case YAFFS_OBJECT_TYPE_UNKNOWN:
396 default:
397 yaffs_trace(YAFFS_TRACE_VERIFY,
398 "Obj %d has illegaltype %d",
399 obj->obj_id, obj->variant_type);
400 break;
401 }
402}
403
404void yaffs_verify_objects(struct yaffs_dev *dev)
405{
406 struct yaffs_obj *obj;
407 int i;
408 struct list_head *lh;
409
410 if (yaffs_skip_verification(dev))
411 return;
412
413 /* Iterate through the objects in each hash entry */
414
415 for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
416 list_for_each(lh, &dev->obj_bucket[i].list) {
417 if (lh) {
418 obj =
419 list_entry(lh, struct yaffs_obj, hash_link);
420 yaffs_verify_obj(obj);
421 }
422 }
423 }
424}
425
426void yaffs_verify_obj_in_dir(struct yaffs_obj *obj)
427{
428 struct list_head *lh;
429 struct yaffs_obj *list_obj;
430
431 int count = 0;
432
433 if (!obj) {
434 yaffs_trace(YAFFS_TRACE_ALWAYS, "No object to verify");
435 YBUG();
436 return;
437 }
438
439 if (yaffs_skip_verification(obj->my_dev))
440 return;
441
442 if (!obj->parent) {
443 yaffs_trace(YAFFS_TRACE_ALWAYS, "Object does not have parent" );
444 YBUG();
445 return;
446 }
447
448 if (obj->parent->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
449 yaffs_trace(YAFFS_TRACE_ALWAYS, "Parent is not directory");
450 YBUG();
451 }
452
453 /* Iterate through the objects in each hash entry */
454
455 list_for_each(lh, &obj->parent->variant.dir_variant.children) {
456 if (lh) {
457 list_obj = list_entry(lh, struct yaffs_obj, siblings);
458 yaffs_verify_obj(list_obj);
459 if (obj == list_obj)
460 count++;
461 }
462 }
463
464 if (count != 1) {
465 yaffs_trace(YAFFS_TRACE_ALWAYS,
466 "Object in directory %d times",
467 count);
468 YBUG();
469 }
470}
471
472void yaffs_verify_dir(struct yaffs_obj *directory)
473{
474 struct list_head *lh;
475 struct yaffs_obj *list_obj;
476
477 if (!directory) {
478 YBUG();
479 return;
480 }
481
482 if (yaffs_skip_full_verification(directory->my_dev))
483 return;
484
485 if (directory->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
486 yaffs_trace(YAFFS_TRACE_ALWAYS,
487 "Directory has wrong type: %d",
488 directory->variant_type);
489 YBUG();
490 }
491
492 /* Iterate through the objects in each hash entry */
493
494 list_for_each(lh, &directory->variant.dir_variant.children) {
495 if (lh) {
496 list_obj = list_entry(lh, struct yaffs_obj, siblings);
497 if (list_obj->parent != directory) {
498 yaffs_trace(YAFFS_TRACE_ALWAYS,
499 "Object in directory list has wrong parent %p",
500 list_obj->parent);
501 YBUG();
502 }
503 yaffs_verify_obj_in_dir(list_obj);
504 }
505 }
506}
507
508static int yaffs_free_verification_failures;
509
510void yaffs_verify_free_chunks(struct yaffs_dev *dev)
511{
512 int counted;
513 int difference;
514
515 if (yaffs_skip_verification(dev))
516 return;
517
518 counted = yaffs_count_free_chunks(dev);
519
520 difference = dev->n_free_chunks - counted;
521
522 if (difference) {
523 yaffs_trace(YAFFS_TRACE_ALWAYS,
524 "Freechunks verification failure %d %d %d",
525 dev->n_free_chunks, counted, difference);
526 yaffs_free_verification_failures++;
527 }
528}
529
530int yaffs_verify_file_sane(struct yaffs_obj *in)
531{
532 in = in;
533 return YAFFS_OK;
534}
535
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-31 23:03:18 -0500