yaffs_verify.c

   1 /*
   2  * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
   3  *
   4  * Copyright (C) 2002-2011 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
  20 int 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
  27 static int yaffs_skip_full_verification(struct yaffs_dev *dev)
  28 {
  29         dev = dev;
  30         return !(yaffs_trace_mask & (YAFFS_TRACE_VERIFY_FULL));
  31 }
  32
  33 static int yaffs_skip_nand_verification(struct yaffs_dev *dev)
  34 {
  35         dev = dev;
  36         return !(yaffs_trace_mask & (YAFFS_TRACE_VERIFY_NAND));
  37 }
  38
  39 static const char * const block_state_name[] = {
  40         "Unknown",
  41         "Needs scan",
  42         "Scanning",
  43         "Empty",
  44         "Allocating",
  45         "Full",
  46         "Dirty",
  47         "Checkpoint",
  48         "Collecting",
  49         "Dead"
  50 };
  51
  52 void 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_SCAN:
  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 void yaffs_verify_collected_blk(struct yaffs_dev *dev,
  97                                 struct yaffs_block_info *bi, int n)
  98 {
  99         yaffs_verify_blk(dev, bi, n);
 100
 101         /* After collection the block should be in the erased state */
 102
 103         if (bi->block_state != YAFFS_BLOCK_STATE_COLLECTING &&
 104             bi->block_state != YAFFS_BLOCK_STATE_EMPTY) {
 105                 yaffs_trace(YAFFS_TRACE_ERROR,
 106                         "Block %d is in state %d after gc, should be erased",
 107                         n, bi->block_state);
 108         }
 109 }
 110
 111 void yaffs_verify_blocks(struct yaffs_dev *dev)
 112 {
 113         int i;
 114         int state_count[YAFFS_NUMBER_OF_BLOCK_STATES];
 115         int illegal_states = 0;
 116
 117         if (yaffs_skip_verification(dev))
 118                 return;
 119
 120         memset(state_count, 0, sizeof(state_count));
 121
 122         for (i = dev->internal_start_block; i <= dev->internal_end_block; i++) {
 123                 struct yaffs_block_info *bi = yaffs_get_block_info(dev, i);
 124                 yaffs_verify_blk(dev, bi, i);
 125
 126                 if (bi->block_state < YAFFS_NUMBER_OF_BLOCK_STATES)
 127                         state_count[bi->block_state]++;
 128                 else
 129                         illegal_states++;
 130         }
 131
 132         yaffs_trace(YAFFS_TRACE_VERIFY, "Block summary");
 133
 134         yaffs_trace(YAFFS_TRACE_VERIFY,
 135                 "%d blocks have illegal states",
 136                 illegal_states);
 137         if (state_count[YAFFS_BLOCK_STATE_ALLOCATING] > 1)
 138                 yaffs_trace(YAFFS_TRACE_VERIFY,
 139                         "Too many allocating blocks");
 140
 141         for (i = 0; i < YAFFS_NUMBER_OF_BLOCK_STATES; i++)
 142                 yaffs_trace(YAFFS_TRACE_VERIFY,
 143                         "%s %d blocks",
 144                         block_state_name[i], state_count[i]);
 145
 146         if (dev->blocks_in_checkpt != state_count[YAFFS_BLOCK_STATE_CHECKPOINT])
 147                 yaffs_trace(YAFFS_TRACE_VERIFY,
 148                         "Checkpoint block count wrong dev %d count %d",
 149                         dev->blocks_in_checkpt,
 150                         state_count[YAFFS_BLOCK_STATE_CHECKPOINT]);
 151
 152         if (dev->n_erased_blocks != state_count[YAFFS_BLOCK_STATE_EMPTY])
 153                 yaffs_trace(YAFFS_TRACE_VERIFY,
 154                         "Erased block count wrong dev %d count %d",
 155                         dev->n_erased_blocks,
 156                         state_count[YAFFS_BLOCK_STATE_EMPTY]);
 157
 158         if (state_count[YAFFS_BLOCK_STATE_COLLECTING] > 1)
 159                 yaffs_trace(YAFFS_TRACE_VERIFY,
 160                         "Too many collecting blocks %d (max is 1)",
 161                         state_count[YAFFS_BLOCK_STATE_COLLECTING]);
 162 }
 163
 164 /*
 165  * Verify the object header. oh must be valid, but obj and tags may be NULL in
 166  * which case those tests will not be performed.
 167  */
 168 void yaffs_verify_oh(struct yaffs_obj *obj, struct yaffs_obj_hdr *oh,
 169                      struct yaffs_ext_tags *tags, int parent_check)
 170 {
 171         if (obj && yaffs_skip_verification(obj->my_dev))
 172                 return;
 173
 174         if (!(tags && obj && oh)) {
 175                 yaffs_trace(YAFFS_TRACE_VERIFY,
 176                         "Verifying object header tags %p obj %p oh %p",
 177                         tags, obj, oh);
 178                 return;
 179         }
 180
 181         if (oh->type <= YAFFS_OBJECT_TYPE_UNKNOWN ||
 182             oh->type > YAFFS_OBJECT_TYPE_MAX)
 183                 yaffs_trace(YAFFS_TRACE_VERIFY,
 184                         "Obj %d header type is illegal value 0x%x",
 185                         tags->obj_id, oh->type);
 186
 187         if (tags->obj_id != obj->obj_id)
 188                 yaffs_trace(YAFFS_TRACE_VERIFY,
 189                         "Obj %d header mismatch obj_id %d",
 190                         tags->obj_id, obj->obj_id);
 191
 192         /*
 193          * Check that the object's parent ids match if parent_check requested.
 194          *
 195          * Tests do not apply to the root object.
 196          */
 197
 198         if (parent_check && tags->obj_id > 1 && !obj->parent)
 199                 yaffs_trace(YAFFS_TRACE_VERIFY,
 200                         "Obj %d header mismatch parent_id %d obj->parent is NULL",
 201                         tags->obj_id, oh->parent_obj_id);
 202
 203         if (parent_check && obj->parent &&
 204             oh->parent_obj_id != obj->parent->obj_id &&
 205             (oh->parent_obj_id != YAFFS_OBJECTID_UNLINKED ||
 206              obj->parent->obj_id != YAFFS_OBJECTID_DELETED))
 207                 yaffs_trace(YAFFS_TRACE_VERIFY,
 208                         "Obj %d header mismatch parent_id %d parent_obj_id %d",
 209                         tags->obj_id, oh->parent_obj_id,
 210                         obj->parent->obj_id);
 211
 212         if (tags->obj_id > 1 && oh->name[0] == 0)       /* Null name */
 213                 yaffs_trace(YAFFS_TRACE_VERIFY,
 214                         "Obj %d header name is NULL",
 215                         obj->obj_id);
 216
 217         if (tags->obj_id > 1 && ((u8) (oh->name[0])) == 0xff)   /* Junk name */
 218                 yaffs_trace(YAFFS_TRACE_VERIFY,
 219                         "Obj %d header name is 0xff",
 220                         obj->obj_id);
 221 }
 222
 223 void yaffs_verify_file(struct yaffs_obj *obj)
 224 {
 225         int required_depth;
 226         int actual_depth;
 227         u32 last_chunk;
 228         u32 the_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                         continue;
 270
 271                 the_chunk = yaffs_get_group_base(dev, tn, i);
 272                 if (the_chunk > 0) {
 273                         yaffs_rd_chunk_tags_nand(dev, the_chunk, NULL,
 274                                                  &tags);
 275                         if (tags.obj_id != obj_id || tags.chunk_id != i)
 276                                 yaffs_trace(YAFFS_TRACE_VERIFY,
 277                                         "Object %d chunk_id %d NAND mismatch chunk %d tags (%d:%d)",
 278                                         obj_id, i, the_chunk,
 279                                         tags.obj_id, tags.chunk_id);
 280                 }
 281         }
 282 }
 283
 284 void yaffs_verify_link(struct yaffs_obj *obj)
 285 {
 286         if (obj && yaffs_skip_verification(obj->my_dev))
 287                 return;
 288
 289         /* Verify sane equivalent object */
 290 }
 291
 292 void yaffs_verify_symlink(struct yaffs_obj *obj)
 293 {
 294         if (obj && yaffs_skip_verification(obj->my_dev))
 295                 return;
 296
 297         /* Verify symlink string */
 298 }
 299
 300 void yaffs_verify_special(struct yaffs_obj *obj)
 301 {
 302         if (obj && yaffs_skip_verification(obj->my_dev))
 303                 return;
 304 }
 305
 306 void yaffs_verify_obj(struct yaffs_obj *obj)
 307 {
 308         struct yaffs_dev *dev;
 309         u32 chunk_min;
 310         u32 chunk_max;
 311         u32 chunk_id_ok;
 312         u32 chunk_in_range;
 313         u32 chunk_wrongly_deleted;
 314         u32 chunk_valid;
 315
 316         if (!obj)
 317                 return;
 318
 319         if (obj->being_created)
 320                 return;
 321
 322         dev = obj->my_dev;
 323
 324         if (yaffs_skip_verification(dev))
 325                 return;
 326
 327         /* Check sane object header chunk */
 328
 329         chunk_min = dev->internal_start_block * dev->param.chunks_per_block;
 330         chunk_max =
 331             (dev->internal_end_block + 1) * dev->param.chunks_per_block - 1;
 332
 333         chunk_in_range = (((unsigned)(obj->hdr_chunk)) >= chunk_min &&
 334                           ((unsigned)(obj->hdr_chunk)) <= chunk_max);
 335         chunk_id_ok = chunk_in_range || (obj->hdr_chunk == 0);
 336         chunk_valid = chunk_in_range &&
 337             yaffs_check_chunk_bit(dev,
 338                                   obj->hdr_chunk / dev->param.chunks_per_block,
 339                                   obj->hdr_chunk % dev->param.chunks_per_block);
 340         chunk_wrongly_deleted = chunk_in_range && !chunk_valid;
 341
 342         if (!obj->fake && (!chunk_id_ok || chunk_wrongly_deleted))
 343                 yaffs_trace(YAFFS_TRACE_VERIFY,
 344                         "Obj %d has chunk_id %d %s %s",
 345                         obj->obj_id, obj->hdr_chunk,
 346                         chunk_id_ok ? "" : ",out of range",
 347                         chunk_wrongly_deleted ? ",marked as deleted" : "");
 348
 349         if (chunk_valid && !yaffs_skip_nand_verification(dev)) {
 350                 struct yaffs_ext_tags tags;
 351                 struct yaffs_obj_hdr *oh;
 352                 u8 *buffer = yaffs_get_temp_buffer(dev);
 353
 354                 oh = (struct yaffs_obj_hdr *)buffer;
 355
 356                 yaffs_rd_chunk_tags_nand(dev, obj->hdr_chunk, buffer, &tags);
 357
 358                 yaffs_verify_oh(obj, oh, &tags, 1);
 359
 360                 yaffs_release_temp_buffer(dev, buffer);
 361         }
 362
 363         /* Verify it has a parent */
 364         if (obj && !obj->fake && (!obj->parent || obj->parent->my_dev != dev)) {
 365                 yaffs_trace(YAFFS_TRACE_VERIFY,
 366                         "Obj %d has parent pointer %p which does not look like an object",
 367                         obj->obj_id, obj->parent);
 368         }
 369
 370         /* Verify parent is a directory */
 371         if (obj->parent &&
 372             obj->parent->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
 373                 yaffs_trace(YAFFS_TRACE_VERIFY,
 374                         "Obj %d's parent is not a directory (type %d)",
 375                         obj->obj_id, obj->parent->variant_type);
 376         }
 377
 378         switch (obj->variant_type) {
 379         case YAFFS_OBJECT_TYPE_FILE:
 380                 yaffs_verify_file(obj);
 381                 break;
 382         case YAFFS_OBJECT_TYPE_SYMLINK:
 383                 yaffs_verify_symlink(obj);
 384                 break;
 385         case YAFFS_OBJECT_TYPE_DIRECTORY:
 386                 yaffs_verify_dir(obj);
 387                 break;
 388         case YAFFS_OBJECT_TYPE_HARDLINK:
 389                 yaffs_verify_link(obj);
 390                 break;
 391         case YAFFS_OBJECT_TYPE_SPECIAL:
 392                 yaffs_verify_special(obj);
 393                 break;
 394         case YAFFS_OBJECT_TYPE_UNKNOWN:
 395         default:
 396                 yaffs_trace(YAFFS_TRACE_VERIFY,
 397                         "Obj %d has illegaltype %d",
 398                    obj->obj_id, obj->variant_type);
 399                 break;
 400         }
 401 }
 402
 403 void yaffs_verify_objects(struct yaffs_dev *dev)
 404 {
 405         struct yaffs_obj *obj;
 406         int i;
 407         struct list_head *lh;
 408
 409         if (yaffs_skip_verification(dev))
 410                 return;
 411
 412         /* Iterate through the objects in each hash entry */
 413
 414         for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
 415                 list_for_each(lh, &dev->obj_bucket[i].list) {
 416                         obj = list_entry(lh, struct yaffs_obj, hash_link);
 417                         yaffs_verify_obj(obj);
 418                 }
 419         }
 420 }
 421
 422 void yaffs_verify_obj_in_dir(struct yaffs_obj *obj)
 423 {
 424         struct list_head *lh;
 425         struct yaffs_obj *list_obj;
 426         int count = 0;
 427
 428         if (!obj) {
 429                 yaffs_trace(YAFFS_TRACE_ALWAYS, "No object to verify");
 430                 BUG();
 431                 return;
 432         }
 433
 434         if (yaffs_skip_verification(obj->my_dev))
 435                 return;
 436
 437         if (!obj->parent) {
 438                 yaffs_trace(YAFFS_TRACE_ALWAYS, "Object does not have parent");
 439                 BUG();
 440                 return;
 441         }
 442
 443         if (obj->parent->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
 444                 yaffs_trace(YAFFS_TRACE_ALWAYS, "Parent is not directory");
 445                 BUG();
 446         }
 447
 448         /* Iterate through the objects in each hash entry */
 449
 450         list_for_each(lh, &obj->parent->variant.dir_variant.children) {
 451                 list_obj = list_entry(lh, struct yaffs_obj, siblings);
 452                 yaffs_verify_obj(list_obj);
 453                 if (obj == list_obj)
 454                         count++;
 455         }
 456
 457         if (count != 1) {
 458                 yaffs_trace(YAFFS_TRACE_ALWAYS,
 459                         "Object in directory %d times",
 460                         count);
 461                 BUG();
 462         }
 463 }
 464
 465 void yaffs_verify_dir(struct yaffs_obj *directory)
 466 {
 467         struct list_head *lh;
 468         struct yaffs_obj *list_obj;
 469
 470         if (!directory) {
 471                 BUG();
 472                 return;
 473         }
 474
 475         if (yaffs_skip_full_verification(directory->my_dev))
 476                 return;
 477
 478         if (directory->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
 479                 yaffs_trace(YAFFS_TRACE_ALWAYS,
 480                         "Directory has wrong type: %d",
 481                         directory->variant_type);
 482                 BUG();
 483         }
 484
 485         /* Iterate through the objects in each hash entry */
 486
 487         list_for_each(lh, &directory->variant.dir_variant.children) {
 488                 list_obj = list_entry(lh, struct yaffs_obj, siblings);
 489                 if (list_obj->parent != directory) {
 490                         yaffs_trace(YAFFS_TRACE_ALWAYS,
 491                                 "Object in directory list has wrong parent %p",
 492                                 list_obj->parent);
 493                         BUG();
 494                 }
 495                 yaffs_verify_obj_in_dir(list_obj);
 496         }
 497 }
 498
 499 static int yaffs_free_verification_failures;
 500
 501 void yaffs_verify_free_chunks(struct yaffs_dev *dev)
 502 {
 503         int counted;
 504         int difference;
 505
 506         if (yaffs_skip_verification(dev))
 507                 return;
 508
 509         counted = yaffs_count_free_chunks(dev);
 510
 511         difference = dev->n_free_chunks - counted;
 512
 513         if (difference) {
 514                 yaffs_trace(YAFFS_TRACE_ALWAYS,
 515                         "Freechunks verification failure %d %d %d",
 516                         dev->n_free_chunks, counted, difference);
 517                 yaffs_free_verification_failures++;
 518         }
 519 }
 520
 521 int yaffs_verify_file_sane(struct yaffs_obj *in)
 522 {
 523         in = in;
 524         return YAFFS_OK;
 525 }