See http://elm-chan.org/fsw/ff/en/mkfs.html for details of f_mkfs() and * associated arguments. */
| 344 | /* See http://elm-chan.org/fsw/ff/en/mkfs.html for details of f_mkfs() and |
| 345 | * associated arguments. */ |
| 346 | int FATFileSystem::format(BlockDevice *bd, bd_size_t cluster_size) |
| 347 | { |
| 348 | FATFileSystem fs; |
| 349 | fs.lock(); |
| 350 | |
| 351 | int err = bd->init(); |
| 352 | if (err) { |
| 353 | fs.unlock(); |
| 354 | return err; |
| 355 | } |
| 356 | |
| 357 | // erase first handful of blocks |
| 358 | bd_size_t header = 2 * bd->get_erase_size(); |
| 359 | err = bd->erase(0, header); |
| 360 | if (err) { |
| 361 | bd->deinit(); |
| 362 | fs.unlock(); |
| 363 | return err; |
| 364 | } |
| 365 | |
| 366 | if (bd->get_erase_value() < 0) { |
| 367 | // erase is unknown, need to write 1s |
| 368 | bd_size_t program_size = bd->get_program_size(); |
| 369 | void *buf = malloc(program_size); |
| 370 | if (!buf) { |
| 371 | bd->deinit(); |
| 372 | fs.unlock(); |
| 373 | return -ENOMEM; |
| 374 | } |
| 375 | |
| 376 | memset(buf, 0xff, program_size); |
| 377 | |
| 378 | for (bd_addr_t i = 0; i < header; i += program_size) { |
| 379 | err = bd->program(buf, i, program_size); |
| 380 | if (err) { |
| 381 | free(buf); |
| 382 | bd->deinit(); |
| 383 | fs.unlock(); |
| 384 | return err; |
| 385 | } |
| 386 | } |
| 387 | |
| 388 | free(buf); |
| 389 | } |
| 390 | |
| 391 | // trim entire device to indicate it is unneeded |
| 392 | err = bd->trim(0, bd->size()); |
| 393 | if (err) { |
| 394 | bd->deinit(); |
| 395 | fs.unlock(); |
| 396 | return err; |
| 397 | } |
| 398 | |
| 399 | err = bd->deinit(); |
| 400 | if (err) { |
| 401 | fs.unlock(); |
| 402 | return err; |
| 403 | } |