| 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_guts.h" |
| 15 | #include "yaffs_tagscompat.h" |
| 16 | #include "yaffs_ecc.h" |
| 17 | #include "yaffs_getblockinfo.h" |
| 18 | #include "yaffs_trace.h" |
| 19 | |
| 20 | static void yaffs_handle_rd_data_error(yaffs_dev_t *dev, int nand_chunk); |
| 21 | #ifdef NOTYET |
| 22 | static void yaffs_check_written_block(yaffs_dev_t *dev, int nand_chunk); |
| 23 | static void yaffs_handle_chunk_wr_ok(yaffs_dev_t *dev, int nand_chunk, |
| 24 | const __u8 *data, |
| 25 | const yaffs_spare *spare); |
| 26 | static void yaffs_handle_chunk_update(yaffs_dev_t *dev, int nand_chunk, |
| 27 | const yaffs_spare *spare); |
| 28 | static void yaffs_handle_chunk_wr_error(yaffs_dev_t *dev, int nand_chunk); |
| 29 | #endif |
| 30 | |
| 31 | static const char yaffs_count_bits_table[256] = { |
| 32 | 0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4, |
| 33 | 1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5, |
| 34 | 1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5, |
| 35 | 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, |
| 36 | 1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5, |
| 37 | 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, |
| 38 | 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, |
| 39 | 3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7, |
| 40 | 1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5, |
| 41 | 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, |
| 42 | 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, |
| 43 | 3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7, |
| 44 | 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, |
| 45 | 3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7, |
| 46 | 3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7, |
| 47 | 4, 5, 5, 6, 5, 6, 6, 7, 5, 6, 6, 7, 6, 7, 7, 8 |
| 48 | }; |
| 49 | |
| 50 | int yaffs_count_bits(__u8 x) |
| 51 | { |
| 52 | int retVal; |
| 53 | retVal = yaffs_count_bits_table[x]; |
| 54 | return retVal; |
| 55 | } |
| 56 | |
| 57 | /********** Tags ECC calculations *********/ |
| 58 | |
| 59 | void yaffs_calc_ecc(const __u8 *data, yaffs_spare *spare) |
| 60 | { |
| 61 | yaffs_ecc_cacl(data, spare->ecc1); |
| 62 | yaffs_ecc_cacl(&data[256], spare->ecc2); |
| 63 | } |
| 64 | |
| 65 | void yaffs_calc_tags_ecc(yaffs_tags_t *tags) |
| 66 | { |
| 67 | /* Calculate an ecc */ |
| 68 | |
| 69 | unsigned char *b = ((yaffs_tags_union_t *) tags)->as_bytes; |
| 70 | unsigned i, j; |
| 71 | unsigned ecc = 0; |
| 72 | unsigned bit = 0; |
| 73 | |
| 74 | tags->ecc = 0; |
| 75 | |
| 76 | for (i = 0; i < 8; i++) { |
| 77 | for (j = 1; j & 0xff; j <<= 1) { |
| 78 | bit++; |
| 79 | if (b[i] & j) |
| 80 | ecc ^= bit; |
| 81 | } |
| 82 | } |
| 83 | |
| 84 | tags->ecc = ecc; |
| 85 | |
| 86 | } |
| 87 | |
| 88 | int yaffs_check_tags_ecc(yaffs_tags_t *tags) |
| 89 | { |
| 90 | unsigned ecc = tags->ecc; |
| 91 | |
| 92 | yaffs_calc_tags_ecc(tags); |
| 93 | |
| 94 | ecc ^= tags->ecc; |
| 95 | |
| 96 | if (ecc && ecc <= 64) { |
| 97 | /* TODO: Handle the failure better. Retire? */ |
| 98 | unsigned char *b = ((yaffs_tags_union_t *) tags)->as_bytes; |
| 99 | |
| 100 | ecc--; |
| 101 | |
| 102 | b[ecc / 8] ^= (1 << (ecc & 7)); |
| 103 | |
| 104 | /* Now recvalc the ecc */ |
| 105 | yaffs_calc_tags_ecc(tags); |
| 106 | |
| 107 | return 1; /* recovered error */ |
| 108 | } else if (ecc) { |
| 109 | /* Wierd ecc failure value */ |
| 110 | /* TODO Need to do somethiong here */ |
| 111 | return -1; /* unrecovered error */ |
| 112 | } |
| 113 | |
| 114 | return 0; |
| 115 | } |
| 116 | |
| 117 | /********** Tags **********/ |
| 118 | |
| 119 | static void yaffs_load_tags_to_spare(yaffs_spare *sparePtr, |
| 120 | yaffs_tags_t *tagsPtr) |
| 121 | { |
| 122 | yaffs_tags_union_t *tu = (yaffs_tags_union_t *) tagsPtr; |
| 123 | |
| 124 | yaffs_calc_tags_ecc(tagsPtr); |
| 125 | |
| 126 | sparePtr->tb0 = tu->as_bytes[0]; |
| 127 | sparePtr->tb1 = tu->as_bytes[1]; |
| 128 | sparePtr->tb2 = tu->as_bytes[2]; |
| 129 | sparePtr->tb3 = tu->as_bytes[3]; |
| 130 | sparePtr->tb4 = tu->as_bytes[4]; |
| 131 | sparePtr->tb5 = tu->as_bytes[5]; |
| 132 | sparePtr->tb6 = tu->as_bytes[6]; |
| 133 | sparePtr->tb7 = tu->as_bytes[7]; |
| 134 | } |
| 135 | |
| 136 | static void yaffs_get_tags_from_spare(yaffs_dev_t *dev, yaffs_spare *sparePtr, |
| 137 | yaffs_tags_t *tagsPtr) |
| 138 | { |
| 139 | yaffs_tags_union_t *tu = (yaffs_tags_union_t *) tagsPtr; |
| 140 | int result; |
| 141 | |
| 142 | tu->as_bytes[0] = sparePtr->tb0; |
| 143 | tu->as_bytes[1] = sparePtr->tb1; |
| 144 | tu->as_bytes[2] = sparePtr->tb2; |
| 145 | tu->as_bytes[3] = sparePtr->tb3; |
| 146 | tu->as_bytes[4] = sparePtr->tb4; |
| 147 | tu->as_bytes[5] = sparePtr->tb5; |
| 148 | tu->as_bytes[6] = sparePtr->tb6; |
| 149 | tu->as_bytes[7] = sparePtr->tb7; |
| 150 | |
| 151 | result = yaffs_check_tags_ecc(tagsPtr); |
| 152 | if (result > 0) |
| 153 | dev->n_tags_ecc_fixed++; |
| 154 | else if (result < 0) |
| 155 | dev->n_tags_ecc_unfixed++; |
| 156 | } |
| 157 | |
| 158 | static void yaffs_spare_init(yaffs_spare *spare) |
| 159 | { |
| 160 | memset(spare, 0xFF, sizeof(yaffs_spare)); |
| 161 | } |
| 162 | |
| 163 | static int yaffs_wr_nand(struct yaffs_dev_s *dev, |
| 164 | int nand_chunk, const __u8 *data, |
| 165 | yaffs_spare *spare) |
| 166 | { |
| 167 | if (nand_chunk < dev->param.start_block * dev->param.chunks_per_block) { |
| 168 | T(YAFFS_TRACE_ERROR, |
| 169 | (TSTR("**>> yaffs chunk %d is not valid" TENDSTR), |
| 170 | nand_chunk)); |
| 171 | return YAFFS_FAIL; |
| 172 | } |
| 173 | |
| 174 | return dev->param.write_chunk_fn(dev, nand_chunk, data, spare); |
| 175 | } |
| 176 | |
| 177 | static int yaffs_rd_chunk_nand(struct yaffs_dev_s *dev, |
| 178 | int nand_chunk, |
| 179 | __u8 *data, |
| 180 | yaffs_spare *spare, |
| 181 | yaffs_ecc_result *ecc_result, |
| 182 | int doErrorCorrection) |
| 183 | { |
| 184 | int retVal; |
| 185 | yaffs_spare localSpare; |
| 186 | |
| 187 | if (!spare && data) { |
| 188 | /* If we don't have a real spare, then we use a local one. */ |
| 189 | /* Need this for the calculation of the ecc */ |
| 190 | spare = &localSpare; |
| 191 | } |
| 192 | |
| 193 | if (!dev->param.use_nand_ecc) { |
| 194 | retVal = dev->param.read_chunk_fn(dev, nand_chunk, data, spare); |
| 195 | if (data && doErrorCorrection) { |
| 196 | /* Do ECC correction */ |
| 197 | /* Todo handle any errors */ |
| 198 | int ecc_result1, ecc_result2; |
| 199 | __u8 calcEcc[3]; |
| 200 | |
| 201 | yaffs_ecc_cacl(data, calcEcc); |
| 202 | ecc_result1 = |
| 203 | yaffs_ecc_correct(data, spare->ecc1, calcEcc); |
| 204 | yaffs_ecc_cacl(&data[256], calcEcc); |
| 205 | ecc_result2 = |
| 206 | yaffs_ecc_correct(&data[256], spare->ecc2, calcEcc); |
| 207 | |
| 208 | if (ecc_result1 > 0) { |
| 209 | T(YAFFS_TRACE_ERROR, |
| 210 | (TSTR |
| 211 | ("**>>yaffs ecc error fix performed on chunk %d:0" |
| 212 | TENDSTR), nand_chunk)); |
| 213 | dev->n_ecc_fixed++; |
| 214 | } else if (ecc_result1 < 0) { |
| 215 | T(YAFFS_TRACE_ERROR, |
| 216 | (TSTR |
| 217 | ("**>>yaffs ecc error unfixed on chunk %d:0" |
| 218 | TENDSTR), nand_chunk)); |
| 219 | dev->n_ecc_unfixed++; |
| 220 | } |
| 221 | |
| 222 | if (ecc_result2 > 0) { |
| 223 | T(YAFFS_TRACE_ERROR, |
| 224 | (TSTR |
| 225 | ("**>>yaffs ecc error fix performed on chunk %d:1" |
| 226 | TENDSTR), nand_chunk)); |
| 227 | dev->n_ecc_fixed++; |
| 228 | } else if (ecc_result2 < 0) { |
| 229 | T(YAFFS_TRACE_ERROR, |
| 230 | (TSTR |
| 231 | ("**>>yaffs ecc error unfixed on chunk %d:1" |
| 232 | TENDSTR), nand_chunk)); |
| 233 | dev->n_ecc_unfixed++; |
| 234 | } |
| 235 | |
| 236 | if (ecc_result1 || ecc_result2) { |
| 237 | /* We had a data problem on this page */ |
| 238 | yaffs_handle_rd_data_error(dev, nand_chunk); |
| 239 | } |
| 240 | |
| 241 | if (ecc_result1 < 0 || ecc_result2 < 0) |
| 242 | *ecc_result = YAFFS_ECC_RESULT_UNFIXED; |
| 243 | else if (ecc_result1 > 0 || ecc_result2 > 0) |
| 244 | *ecc_result = YAFFS_ECC_RESULT_FIXED; |
| 245 | else |
| 246 | *ecc_result = YAFFS_ECC_RESULT_NO_ERROR; |
| 247 | } |
| 248 | } else { |
| 249 | /* Must allocate enough memory for spare+2*sizeof(int) */ |
| 250 | /* for ecc results from device. */ |
| 251 | struct yaffs_nand_spare nspare; |
| 252 | |
| 253 | memset(&nspare, 0, sizeof(nspare)); |
| 254 | |
| 255 | retVal = dev->param.read_chunk_fn(dev, nand_chunk, data, |
| 256 | (yaffs_spare *) &nspare); |
| 257 | memcpy(spare, &nspare, sizeof(yaffs_spare)); |
| 258 | if (data && doErrorCorrection) { |
| 259 | if (nspare.eccres1 > 0) { |
| 260 | T(YAFFS_TRACE_ERROR, |
| 261 | (TSTR |
| 262 | ("**>>mtd ecc error fix performed on chunk %d:0" |
| 263 | TENDSTR), nand_chunk)); |
| 264 | } else if (nspare.eccres1 < 0) { |
| 265 | T(YAFFS_TRACE_ERROR, |
| 266 | (TSTR |
| 267 | ("**>>mtd ecc error unfixed on chunk %d:0" |
| 268 | TENDSTR), nand_chunk)); |
| 269 | } |
| 270 | |
| 271 | if (nspare.eccres2 > 0) { |
| 272 | T(YAFFS_TRACE_ERROR, |
| 273 | (TSTR |
| 274 | ("**>>mtd ecc error fix performed on chunk %d:1" |
| 275 | TENDSTR), nand_chunk)); |
| 276 | } else if (nspare.eccres2 < 0) { |
| 277 | T(YAFFS_TRACE_ERROR, |
| 278 | (TSTR |
| 279 | ("**>>mtd ecc error unfixed on chunk %d:1" |
| 280 | TENDSTR), nand_chunk)); |
| 281 | } |
| 282 | |
| 283 | if (nspare.eccres1 || nspare.eccres2) { |
| 284 | /* We had a data problem on this page */ |
| 285 | yaffs_handle_rd_data_error(dev, nand_chunk); |
| 286 | } |
| 287 | |
| 288 | if (nspare.eccres1 < 0 || nspare.eccres2 < 0) |
| 289 | *ecc_result = YAFFS_ECC_RESULT_UNFIXED; |
| 290 | else if (nspare.eccres1 > 0 || nspare.eccres2 > 0) |
| 291 | *ecc_result = YAFFS_ECC_RESULT_FIXED; |
| 292 | else |
| 293 | *ecc_result = YAFFS_ECC_RESULT_NO_ERROR; |
| 294 | |
| 295 | } |
| 296 | } |
| 297 | return retVal; |
| 298 | } |
| 299 | |
| 300 | #ifdef NOTYET |
| 301 | static int yaffs_check_chunk_erased(struct yaffs_dev_s *dev, |
| 302 | int nand_chunk) |
| 303 | { |
| 304 | static int init; |
| 305 | static __u8 cmpbuf[YAFFS_BYTES_PER_CHUNK]; |
| 306 | static __u8 data[YAFFS_BYTES_PER_CHUNK]; |
| 307 | /* Might as well always allocate the larger size for */ |
| 308 | /* dev->param.use_nand_ecc == true; */ |
| 309 | static __u8 spare[sizeof(struct yaffs_nand_spare)]; |
| 310 | |
| 311 | dev->param.read_chunk_fn(dev, nand_chunk, data, (yaffs_spare *) spare); |
| 312 | |
| 313 | if (!init) { |
| 314 | memset(cmpbuf, 0xff, YAFFS_BYTES_PER_CHUNK); |
| 315 | init = 1; |
| 316 | } |
| 317 | |
| 318 | if (memcmp(cmpbuf, data, YAFFS_BYTES_PER_CHUNK)) |
| 319 | return YAFFS_FAIL; |
| 320 | if (memcmp(cmpbuf, spare, 16)) |
| 321 | return YAFFS_FAIL; |
| 322 | |
| 323 | return YAFFS_OK; |
| 324 | |
| 325 | } |
| 326 | #endif |
| 327 | |
| 328 | /* |
| 329 | * Functions for robustisizing |
| 330 | */ |
| 331 | |
| 332 | static void yaffs_handle_rd_data_error(yaffs_dev_t *dev, int nand_chunk) |
| 333 | { |
| 334 | int flash_block = nand_chunk / dev->param.chunks_per_block; |
| 335 | |
| 336 | /* Mark the block for retirement */ |
| 337 | yaffs_get_block_info(dev, flash_block + dev->block_offset)->needs_retiring = 1; |
| 338 | T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS, |
| 339 | (TSTR("**>>Block %d marked for retirement" TENDSTR), flash_block)); |
| 340 | |
| 341 | /* TODO: |
| 342 | * Just do a garbage collection on the affected block |
| 343 | * then retire the block |
| 344 | * NB recursion |
| 345 | */ |
| 346 | } |
| 347 | |
| 348 | #ifdef NOTYET |
| 349 | static void yaffs_check_written_block(yaffs_dev_t *dev, int nand_chunk) |
| 350 | { |
| 351 | } |
| 352 | |
| 353 | static void yaffs_handle_chunk_wr_ok(yaffs_dev_t *dev, int nand_chunk, |
| 354 | const __u8 *data, |
| 355 | const yaffs_spare *spare) |
| 356 | { |
| 357 | } |
| 358 | |
| 359 | static void yaffs_handle_chunk_update(yaffs_dev_t *dev, int nand_chunk, |
| 360 | const yaffs_spare *spare) |
| 361 | { |
| 362 | } |
| 363 | |
| 364 | static void yaffs_handle_chunk_wr_error(yaffs_dev_t *dev, int nand_chunk) |
| 365 | { |
| 366 | int flash_block = nand_chunk / dev->param.chunks_per_block; |
| 367 | |
| 368 | /* Mark the block for retirement */ |
| 369 | yaffs_get_block_info(dev, flash_block)->needs_retiring = 1; |
| 370 | /* Delete the chunk */ |
| 371 | yaffs_chunk_del(dev, nand_chunk, 1, __LINE__); |
| 372 | } |
| 373 | |
| 374 | static int yaffs_verify_cmp(const __u8 *d0, const __u8 *d1, |
| 375 | const yaffs_spare *s0, const yaffs_spare *s1) |
| 376 | { |
| 377 | |
| 378 | if (memcmp(d0, d1, YAFFS_BYTES_PER_CHUNK) != 0 || |
| 379 | s0->tb0 != s1->tb0 || |
| 380 | s0->tb1 != s1->tb1 || |
| 381 | s0->tb2 != s1->tb2 || |
| 382 | s0->tb3 != s1->tb3 || |
| 383 | s0->tb4 != s1->tb4 || |
| 384 | s0->tb5 != s1->tb5 || |
| 385 | s0->tb6 != s1->tb6 || |
| 386 | s0->tb7 != s1->tb7 || |
| 387 | s0->ecc1[0] != s1->ecc1[0] || |
| 388 | s0->ecc1[1] != s1->ecc1[1] || |
| 389 | s0->ecc1[2] != s1->ecc1[2] || |
| 390 | s0->ecc2[0] != s1->ecc2[0] || |
| 391 | s0->ecc2[1] != s1->ecc2[1] || s0->ecc2[2] != s1->ecc2[2]) { |
| 392 | return 0; |
| 393 | } |
| 394 | |
| 395 | return 1; |
| 396 | } |
| 397 | #endif /* NOTYET */ |
| 398 | |
| 399 | int yaffs_tags_compat_wr(yaffs_dev_t *dev, |
| 400 | int nand_chunk, |
| 401 | const __u8 *data, |
| 402 | const yaffs_ext_tags *eTags) |
| 403 | { |
| 404 | yaffs_spare spare; |
| 405 | yaffs_tags_t tags; |
| 406 | |
| 407 | yaffs_spare_init(&spare); |
| 408 | |
| 409 | if (eTags->is_deleted) |
| 410 | spare.page_status = 0; |
| 411 | else { |
| 412 | tags.obj_id = eTags->obj_id; |
| 413 | tags.chunk_id = eTags->chunk_id; |
| 414 | |
| 415 | tags.n_bytes_lsb = eTags->n_bytes & 0x3ff; |
| 416 | |
| 417 | if (dev->data_bytes_per_chunk >= 1024) |
| 418 | tags.n_bytes_msb = (eTags->n_bytes >> 10) & 3; |
| 419 | else |
| 420 | tags.n_bytes_msb = 3; |
| 421 | |
| 422 | |
| 423 | tags.serial_number = eTags->serial_number; |
| 424 | |
| 425 | if (!dev->param.use_nand_ecc && data) |
| 426 | yaffs_calc_ecc(data, &spare); |
| 427 | |
| 428 | yaffs_load_tags_to_spare(&spare, &tags); |
| 429 | |
| 430 | } |
| 431 | |
| 432 | return yaffs_wr_nand(dev, nand_chunk, data, &spare); |
| 433 | } |
| 434 | |
| 435 | int yaffs_tags_compat_rd(yaffs_dev_t *dev, |
| 436 | int nand_chunk, |
| 437 | __u8 *data, |
| 438 | yaffs_ext_tags *eTags) |
| 439 | { |
| 440 | |
| 441 | yaffs_spare spare; |
| 442 | yaffs_tags_t tags; |
| 443 | yaffs_ecc_result ecc_result = YAFFS_ECC_RESULT_UNKNOWN; |
| 444 | |
| 445 | static yaffs_spare spareFF; |
| 446 | static int init; |
| 447 | |
| 448 | if (!init) { |
| 449 | memset(&spareFF, 0xFF, sizeof(spareFF)); |
| 450 | init = 1; |
| 451 | } |
| 452 | |
| 453 | if (yaffs_rd_chunk_nand |
| 454 | (dev, nand_chunk, data, &spare, &ecc_result, 1)) { |
| 455 | /* eTags may be NULL */ |
| 456 | if (eTags) { |
| 457 | |
| 458 | int deleted = |
| 459 | (yaffs_count_bits(spare.page_status) < 7) ? 1 : 0; |
| 460 | |
| 461 | eTags->is_deleted = deleted; |
| 462 | eTags->ecc_result = ecc_result; |
| 463 | eTags->block_bad = 0; /* We're reading it */ |
| 464 | /* therefore it is not a bad block */ |
| 465 | eTags->chunk_used = |
| 466 | (memcmp(&spareFF, &spare, sizeof(spareFF)) != |
| 467 | 0) ? 1 : 0; |
| 468 | |
| 469 | if (eTags->chunk_used) { |
| 470 | yaffs_get_tags_from_spare(dev, &spare, &tags); |
| 471 | |
| 472 | eTags->obj_id = tags.obj_id; |
| 473 | eTags->chunk_id = tags.chunk_id; |
| 474 | eTags->n_bytes = tags.n_bytes_lsb; |
| 475 | |
| 476 | if (dev->data_bytes_per_chunk >= 1024) |
| 477 | eTags->n_bytes |= (((unsigned) tags.n_bytes_msb) << 10); |
| 478 | |
| 479 | eTags->serial_number = tags.serial_number; |
| 480 | } |
| 481 | } |
| 482 | |
| 483 | return YAFFS_OK; |
| 484 | } else { |
| 485 | return YAFFS_FAIL; |
| 486 | } |
| 487 | } |
| 488 | |
| 489 | int yaffs_tags_compat_mark_bad(struct yaffs_dev_s *dev, |
| 490 | int flash_block) |
| 491 | { |
| 492 | |
| 493 | yaffs_spare spare; |
| 494 | |
| 495 | memset(&spare, 0xff, sizeof(yaffs_spare)); |
| 496 | |
| 497 | spare.block_status = 'Y'; |
| 498 | |
| 499 | yaffs_wr_nand(dev, flash_block * dev->param.chunks_per_block, NULL, |
| 500 | &spare); |
| 501 | yaffs_wr_nand(dev, flash_block * dev->param.chunks_per_block + 1, |
| 502 | NULL, &spare); |
| 503 | |
| 504 | return YAFFS_OK; |
| 505 | |
| 506 | } |
| 507 | |
| 508 | int yaffs_tags_compat_query_block(struct yaffs_dev_s *dev, |
| 509 | int block_no, |
| 510 | yaffs_block_state_t *state, |
| 511 | __u32 *seq_number) |
| 512 | { |
| 513 | |
| 514 | yaffs_spare spare0, spare1; |
| 515 | static yaffs_spare spareFF; |
| 516 | static int init; |
| 517 | yaffs_ecc_result dummy; |
| 518 | |
| 519 | if (!init) { |
| 520 | memset(&spareFF, 0xFF, sizeof(spareFF)); |
| 521 | init = 1; |
| 522 | } |
| 523 | |
| 524 | *seq_number = 0; |
| 525 | |
| 526 | yaffs_rd_chunk_nand(dev, block_no * dev->param.chunks_per_block, NULL, |
| 527 | &spare0, &dummy, 1); |
| 528 | yaffs_rd_chunk_nand(dev, block_no * dev->param.chunks_per_block + 1, NULL, |
| 529 | &spare1, &dummy, 1); |
| 530 | |
| 531 | if (yaffs_count_bits(spare0.block_status & spare1.block_status) < 7) |
| 532 | *state = YAFFS_BLOCK_STATE_DEAD; |
| 533 | else if (memcmp(&spareFF, &spare0, sizeof(spareFF)) == 0) |
| 534 | *state = YAFFS_BLOCK_STATE_EMPTY; |
| 535 | else |
| 536 | *state = YAFFS_BLOCK_STATE_NEEDS_SCANNING; |
| 537 | |
| 538 | return YAFFS_OK; |
| 539 | } |
| 540 | |
