yaffs_verify.c

   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
  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 scanning",
  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_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 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 x;
 229         u32 i;
 230         struct yaffs_dev *dev;
 231         struct yaffs_ext_tags tags;
 232         struct yaffs_tnode *tn;
 233         u32 obj_id;
 234
 235         if (!obj)
 236                 return;
 237
 238         if (yaffs_skip_verification(obj->my_dev))
 239                 return;
 240
 241         dev = obj->my_dev;
 242         obj_id = obj->obj_id;
 243
 244         /* Check file size is consistent with tnode depth */
 245         last_chunk =
 246             obj->variant.file_variant.file_size / dev->data_bytes_per_chunk + 1;
 247         x = last_chunk >> YAFFS_TNODES_LEVEL0_BITS;
 248         required_depth = 0;
 249         while (x > 0) {
 250                 x >>= YAFFS_TNODES_INTERNAL_BITS;
 251                 required_depth++;
 252         }
 253
 254         actual_depth = obj->variant.file_variant.top_level;
 255
 256         /* Check that the chunks in the tnode tree are all correct.
 257          * We do this by scanning through the tnode tree and
 258          * checking the tags for every chunk match.
 259          */
 260
 261         if (yaffs_skip_nand_verification(dev))
 262                 return;
 263
 264         for (i = 1; i <= last_chunk; i++) {
 265                 tn = yaffs_find_tnode_0(dev, &obj->variant.file_variant, i);
 266
 267                 if (tn) {
 268                         u32 the_chunk = yaffs_get_group_base(dev, tn, i);
 269                         if (the_chunk > 0) {
 270                                 yaffs_rd_chunk_tags_nand(dev, the_chunk, NULL,
 271                                                          &tags);
 272                                 if (tags.obj_id != obj_id || tags.chunk_id != i)
 273                                         yaffs_trace(YAFFS_TRACE_VERIFY,
 274                                                 "Object %d chunk_id %d NAND mismatch chunk %d tags (%d:%d)",
 275                                                 obj_id, i, the_chunk,
 276                                                 tags.obj_id, tags.chunk_id);
 277                         }
 278                 }
 279         }
 280 }
 281
 282 void yaffs_verify_link(struct yaffs_obj *obj)
 283 {
 284         if (obj && yaffs_skip_verification(obj->my_dev))
 285                 return;
 286
 287         /* Verify sane equivalent object */
 288 }
 289
 290 void yaffs_verify_symlink(struct yaffs_obj *obj)
 291 {
 292         if (obj && yaffs_skip_verification(obj->my_dev))
 293                 return;
 294
 295         /* Verify symlink string */
 296 }
 297
 298 void yaffs_verify_special(struct yaffs_obj *obj)
 299 {
 300         if (obj && yaffs_skip_verification(obj->my_dev))
 301                 return;
 302 }
 303
 304 void yaffs_verify_obj(struct yaffs_obj *obj)
 305 {
 306         struct yaffs_dev *dev;
 307         u32 chunk_min;
 308         u32 chunk_max;
 309         u32 chunk_id_ok;
 310         u32 chunk_in_range;
 311         u32 chunk_wrongly_deleted;
 312         u32 chunk_valid;
 313
 314         if (!obj)
 315                 return;
 316
 317         if (obj->being_created)
 318                 return;
 319
 320         dev = obj->my_dev;
 321
 322         if (yaffs_skip_verification(dev))
 323                 return;
 324
 325         /* Check sane object header chunk */
 326
 327         chunk_min = dev->internal_start_block * dev->param.chunks_per_block;
 328         chunk_max =
 329             (dev->internal_end_block + 1) * dev->param.chunks_per_block - 1;
 330
 331         chunk_in_range = (((unsigned)(obj->hdr_chunk)) >= chunk_min &&
 332                           ((unsigned)(obj->hdr_chunk)) <= chunk_max);
 333         chunk_id_ok = chunk_in_range || (obj->hdr_chunk == 0);
 334         chunk_valid = chunk_in_range &&
 335             yaffs_check_chunk_bit(dev,
 336                                   obj->hdr_chunk / dev->param.chunks_per_block,
 337                                   obj->hdr_chunk % dev->param.chunks_per_block);
 338         chunk_wrongly_deleted = chunk_in_range && !chunk_valid;
 339
 340         if (!obj->fake && (!chunk_id_ok || chunk_wrongly_deleted))
 341                 yaffs_trace(YAFFS_TRACE_VERIFY,
 342                         "Obj %d has chunk_id %d %s %s",
 343                         obj->obj_id, obj->hdr_chunk,
 344                         chunk_id_ok ? "" : ",out of range",
 345                         chunk_wrongly_deleted ? ",marked as deleted" : "");
 346
 347         if (chunk_valid && !yaffs_skip_nand_verification(dev)) {
 348                 struct yaffs_ext_tags tags;
 349                 struct yaffs_obj_hdr *oh;
 350                 u8 *buffer = yaffs_get_temp_buffer(dev, __LINE__);
 351
 352                 oh = (struct yaffs_obj_hdr *)buffer;
 353
 354                 yaffs_rd_chunk_tags_nand(dev, obj->hdr_chunk, buffer, &tags);
 355
 356                 yaffs_verify_oh(obj, oh, &tags, 1);
 357
 358                 yaffs_release_temp_buffer(dev, buffer, __LINE__);
 359         }
 360
 361         /* Verify it has a parent */
 362         if (obj && !obj->fake && (!obj->parent || obj->parent->my_dev != dev)) {
 363                 yaffs_trace(YAFFS_TRACE_VERIFY,
 364                         "Obj %d has parent pointer %p which does not look like an object",
 365                         obj->obj_id, obj->parent);
 366         }
 367
 368         /* Verify parent is a directory */
 369         if (obj->parent
 370             && obj->parent->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
 371                 yaffs_trace(YAFFS_TRACE_VERIFY,
 372                         "Obj %d's parent is not a directory (type %d)",
 373                         obj->obj_id, obj->parent->variant_type);
 374         }
 375
 376         switch (obj->variant_type) {
 377         case YAFFS_OBJECT_TYPE_FILE:
 378                 yaffs_verify_file(obj);
 379                 break;
 380         case YAFFS_OBJECT_TYPE_SYMLINK:
 381                 yaffs_verify_symlink(obj);
 382                 break;
 383         case YAFFS_OBJECT_TYPE_DIRECTORY:
 384                 yaffs_verify_dir(obj);
 385                 break;
 386         case YAFFS_OBJECT_TYPE_HARDLINK:
 387                 yaffs_verify_link(obj);
 388                 break;
 389         case YAFFS_OBJECT_TYPE_SPECIAL:
 390                 yaffs_verify_special(obj);
 391                 break;
 392         case YAFFS_OBJECT_TYPE_UNKNOWN:
 393         default:
 394                 yaffs_trace(YAFFS_TRACE_VERIFY,
 395                         "Obj %d has illegaltype %d",
 396                    obj->obj_id, obj->variant_type);
 397                 break;
 398         }
 399 }
 400
 401 void yaffs_verify_objects(struct yaffs_dev *dev)
 402 {
 403         struct yaffs_obj *obj;
 404         int i;
 405         struct list_head *lh;
 406
 407         if (yaffs_skip_verification(dev))
 408                 return;
 409
 410         /* Iterate through the objects in each hash entry */
 411
 412         for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
 413                 list_for_each(lh, &dev->obj_bucket[i].list) {
 414                         obj = list_entry(lh, struct yaffs_obj, hash_link);
 415                         yaffs_verify_obj(obj);
 416                 }
 417         }
 418 }
 419
 420 void yaffs_verify_obj_in_dir(struct yaffs_obj *obj)
 421 {
 422         struct list_head *lh;
 423         struct yaffs_obj *list_obj;
 424         int count = 0;
 425
 426         if (!obj) {
 427                 yaffs_trace(YAFFS_TRACE_ALWAYS, "No object to verify");
 428                 YBUG();
 429                 return;
 430         }
 431
 432         if (yaffs_skip_verification(obj->my_dev))
 433                 return;
 434
 435         if (!obj->parent) {
 436                 yaffs_trace(YAFFS_TRACE_ALWAYS, "Object does not have parent");
 437                 YBUG();
 438                 return;
 439         }
 440
 441         if (obj->parent->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
 442                 yaffs_trace(YAFFS_TRACE_ALWAYS, "Parent is not directory");
 443                 YBUG();
 444         }
 445
 446         /* Iterate through the objects in each hash entry */
 447
 448         list_for_each(lh, &obj->parent->variant.dir_variant.children) {
 449                 list_obj = list_entry(lh, struct yaffs_obj, siblings);
 450                 yaffs_verify_obj(list_obj);
 451                 if (obj == list_obj)
 452                         count++;
 453         }
 454
 455         if (count != 1) {
 456                 yaffs_trace(YAFFS_TRACE_ALWAYS,
 457                         "Object in directory %d times",
 458                         count);
 459                 YBUG();
 460         }
 461 }
 462
 463 void yaffs_verify_dir(struct yaffs_obj *directory)
 464 {
 465         struct list_head *lh;
 466         struct yaffs_obj *list_obj;
 467
 468         if (!directory) {
 469                 YBUG();
 470                 return;
 471         }
 472
 473         if (yaffs_skip_full_verification(directory->my_dev))
 474                 return;
 475
 476         if (directory->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
 477                 yaffs_trace(YAFFS_TRACE_ALWAYS,
 478                         "Directory has wrong type: %d",
 479                         directory->variant_type);
 480                 YBUG();
 481         }
 482
 483         /* Iterate through the objects in each hash entry */
 484
 485         list_for_each(lh, &directory->variant.dir_variant.children) {
 486                 list_obj = list_entry(lh, struct yaffs_obj, siblings);
 487                 if (list_obj->parent != directory) {
 488                         yaffs_trace(YAFFS_TRACE_ALWAYS,
 489                                 "Object in directory list has wrong parent %p",
 490                                 list_obj->parent);
 491                         YBUG();
 492                 }
 493                 yaffs_verify_obj_in_dir(list_obj);
 494         }
 495 }
 496
 497 static int yaffs_free_verification_failures;
 498
 499 void yaffs_verify_free_chunks(struct yaffs_dev *dev)
 500 {
 501         int counted;
 502         int difference;
 503
 504         if (yaffs_skip_verification(dev))
 505                 return;
 506
 507         counted = yaffs_count_free_chunks(dev);
 508
 509         difference = dev->n_free_chunks - counted;
 510
 511         if (difference) {
 512                 yaffs_trace(YAFFS_TRACE_ALWAYS,
 513                         "Freechunks verification failure %d %d %d",
 514                         dev->n_free_chunks, counted, difference);
 515                 yaffs_free_verification_failures++;
 516         }
 517 }
 518
 519 int yaffs_verify_file_sane(struct yaffs_obj *in)
 520 {
 521         in = in;
 522         return YAFFS_OK;
 523 }
 524