| 1 | /* |
| 2 | * Copyright (c) International Business Machines Corp., 2006 |
| 3 | * Copyright (C) 2009 Nokia Corporation |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License as published by |
| 7 | * the Free Software Foundation; either version 2 of the License, or |
| 8 | * (at your option) any later version. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See |
| 13 | * the GNU General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License |
| 16 | * along with this program; if not, write to the Free Software |
| 17 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
| 18 | * |
| 19 | * Author: Artem Bityutskiy |
| 20 | * |
| 21 | * MTD library. |
| 22 | */ |
| 23 | |
| 24 | /* Imported from mtd-utils by dehrenberg */ |
| 25 | |
| 26 | #include <limits.h> |
| 27 | #include <stdlib.h> |
| 28 | #include <stdio.h> |
| 29 | #include <errno.h> |
| 30 | #include <unistd.h> |
| 31 | #include <fcntl.h> |
| 32 | #include <dirent.h> |
| 33 | #include <sys/types.h> |
| 34 | #include <sys/stat.h> |
| 35 | #include <sys/ioctl.h> |
| 36 | #include <inttypes.h> |
| 37 | |
| 38 | #include <mtd/mtd-user.h> |
| 39 | #include "libmtd.h" |
| 40 | |
| 41 | #include "libmtd_int.h" |
| 42 | #include "libmtd_common.h" |
| 43 | |
| 44 | /** |
| 45 | * mkpath - compose full path from 2 given components. |
| 46 | * @path: the first component |
| 47 | * @name: the second component |
| 48 | * |
| 49 | * This function returns the resulting path in case of success and %NULL in |
| 50 | * case of failure. |
| 51 | */ |
| 52 | static char *mkpath(const char *path, const char *name) |
| 53 | { |
| 54 | char *n; |
| 55 | size_t len1 = strlen(path); |
| 56 | size_t len2 = strlen(name); |
| 57 | |
| 58 | n = xmalloc(len1 + len2 + 6); |
| 59 | |
| 60 | memcpy(n, path, len1); |
| 61 | if (n[len1 - 1] != '/') |
| 62 | n[len1++] = '/'; |
| 63 | |
| 64 | memcpy(n + len1, name, len2 + 1); |
| 65 | return n; |
| 66 | } |
| 67 | |
| 68 | /** |
| 69 | * read_data - read data from a file. |
| 70 | * @file: the file to read from |
| 71 | * @buf: the buffer to read to |
| 72 | * @buf_len: buffer length |
| 73 | * |
| 74 | * This function returns number of read bytes in case of success and %-1 in |
| 75 | * case of failure. Note, if the file contains more then @buf_len bytes of |
| 76 | * date, this function fails with %EINVAL error code. |
| 77 | */ |
| 78 | static int read_data(const char *file, void *buf, int buf_len) |
| 79 | { |
| 80 | int fd, rd, tmp, tmp1; |
| 81 | |
| 82 | fd = open(file, O_RDONLY | O_CLOEXEC); |
| 83 | if (fd == -1) |
| 84 | return -1; |
| 85 | |
| 86 | rd = read(fd, buf, buf_len); |
| 87 | if (rd == -1) { |
| 88 | sys_errmsg("cannot read \"%s\"", file); |
| 89 | goto out_error; |
| 90 | } |
| 91 | |
| 92 | if (rd == buf_len) { |
| 93 | errmsg("contents of \"%s\" is too long", file); |
| 94 | errno = EINVAL; |
| 95 | goto out_error; |
| 96 | } |
| 97 | |
| 98 | ((char *)buf)[rd] = '\0'; |
| 99 | |
| 100 | /* Make sure all data is read */ |
| 101 | tmp1 = read(fd, &tmp, 1); |
| 102 | if (tmp1 == 1) { |
| 103 | sys_errmsg("cannot read \"%s\"", file); |
| 104 | goto out_error; |
| 105 | } |
| 106 | if (tmp1) { |
| 107 | errmsg("file \"%s\" contains too much data (> %d bytes)", |
| 108 | file, buf_len); |
| 109 | errno = EINVAL; |
| 110 | goto out_error; |
| 111 | } |
| 112 | |
| 113 | if (close(fd)) { |
| 114 | sys_errmsg("close failed on \"%s\"", file); |
| 115 | return -1; |
| 116 | } |
| 117 | |
| 118 | return rd; |
| 119 | |
| 120 | out_error: |
| 121 | close(fd); |
| 122 | return -1; |
| 123 | } |
| 124 | |
| 125 | /** |
| 126 | * read_major - read major and minor numbers from a file. |
| 127 | * @file: name of the file to read from |
| 128 | * @major: major number is returned here |
| 129 | * @minor: minor number is returned here |
| 130 | * |
| 131 | * This function returns % in case of success, and %-1 in case of failure. |
| 132 | */ |
| 133 | static int read_major(const char *file, int *major, int *minor) |
| 134 | { |
| 135 | int ret; |
| 136 | char buf[50]; |
| 137 | |
| 138 | ret = read_data(file, buf, 50); |
| 139 | if (ret < 0) |
| 140 | return ret; |
| 141 | |
| 142 | ret = sscanf(buf, "%d:%d\n", major, minor); |
| 143 | if (ret != 2) { |
| 144 | errno = EINVAL; |
| 145 | return errmsg("\"%s\" does not have major:minor format", file); |
| 146 | } |
| 147 | |
| 148 | if (*major < 0 || *minor < 0) { |
| 149 | errno = EINVAL; |
| 150 | return errmsg("bad major:minor %d:%d in \"%s\"", |
| 151 | *major, *minor, file); |
| 152 | } |
| 153 | |
| 154 | return 0; |
| 155 | } |
| 156 | |
| 157 | /** |
| 158 | * dev_get_major - get major and minor numbers of an MTD device. |
| 159 | * @lib: libmtd descriptor |
| 160 | * @mtd_num: MTD device number |
| 161 | * @major: major number is returned here |
| 162 | * @minor: minor number is returned here |
| 163 | * |
| 164 | * This function returns zero in case of success and %-1 in case of failure. |
| 165 | */ |
| 166 | static int dev_get_major(struct libmtd *lib, int mtd_num, int *major, int *minor) |
| 167 | { |
| 168 | char file[strlen(lib->mtd_dev) + 50]; |
| 169 | |
| 170 | sprintf(file, lib->mtd_dev, mtd_num); |
| 171 | return read_major(file, major, minor); |
| 172 | } |
| 173 | |
| 174 | /** |
| 175 | * dev_read_data - read data from an MTD device's sysfs file. |
| 176 | * @patt: file pattern to read from |
| 177 | * @mtd_num: MTD device number |
| 178 | * @buf: buffer to read to |
| 179 | * @buf_len: buffer length |
| 180 | * |
| 181 | * This function returns number of read bytes in case of success and %-1 in |
| 182 | * case of failure. |
| 183 | */ |
| 184 | static int dev_read_data(const char *patt, int mtd_num, void *buf, int buf_len) |
| 185 | { |
| 186 | char file[strlen(patt) + 100]; |
| 187 | |
| 188 | sprintf(file, patt, mtd_num); |
| 189 | return read_data(file, buf, buf_len); |
| 190 | } |
| 191 | |
| 192 | /** |
| 193 | * read_hex_ll - read a hex 'long long' value from a file. |
| 194 | * @file: the file to read from |
| 195 | * @value: the result is stored here |
| 196 | * |
| 197 | * This function reads file @file and interprets its contents as hexadecimal |
| 198 | * 'long long' integer. If this is not true, it fails with %EINVAL error code. |
| 199 | * Returns %0 in case of success and %-1 in case of failure. |
| 200 | */ |
| 201 | static int read_hex_ll(const char *file, long long *value) |
| 202 | { |
| 203 | int fd, rd; |
| 204 | char buf[50]; |
| 205 | |
| 206 | fd = open(file, O_RDONLY | O_CLOEXEC); |
| 207 | if (fd == -1) |
| 208 | return -1; |
| 209 | |
| 210 | rd = read(fd, buf, sizeof(buf)); |
| 211 | if (rd == -1) { |
| 212 | sys_errmsg("cannot read \"%s\"", file); |
| 213 | goto out_error; |
| 214 | } |
| 215 | if (rd == sizeof(buf)) { |
| 216 | errmsg("contents of \"%s\" is too long", file); |
| 217 | errno = EINVAL; |
| 218 | goto out_error; |
| 219 | } |
| 220 | buf[rd] = '\0'; |
| 221 | |
| 222 | if (sscanf(buf, "%llx\n", value) != 1) { |
| 223 | errmsg("cannot read integer from \"%s\"\n", file); |
| 224 | errno = EINVAL; |
| 225 | goto out_error; |
| 226 | } |
| 227 | |
| 228 | if (*value < 0) { |
| 229 | errmsg("negative value %lld in \"%s\"", *value, file); |
| 230 | errno = EINVAL; |
| 231 | goto out_error; |
| 232 | } |
| 233 | |
| 234 | if (close(fd)) |
| 235 | return sys_errmsg("close failed on \"%s\"", file); |
| 236 | |
| 237 | return 0; |
| 238 | |
| 239 | out_error: |
| 240 | close(fd); |
| 241 | return -1; |
| 242 | } |
| 243 | |
| 244 | /** |
| 245 | * read_pos_ll - read a positive 'long long' value from a file. |
| 246 | * @file: the file to read from |
| 247 | * @value: the result is stored here |
| 248 | * |
| 249 | * This function reads file @file and interprets its contents as a positive |
| 250 | * 'long long' integer. If this is not true, it fails with %EINVAL error code. |
| 251 | * Returns %0 in case of success and %-1 in case of failure. |
| 252 | */ |
| 253 | static int read_pos_ll(const char *file, long long *value) |
| 254 | { |
| 255 | int fd, rd; |
| 256 | char buf[50]; |
| 257 | |
| 258 | fd = open(file, O_RDONLY | O_CLOEXEC); |
| 259 | if (fd == -1) |
| 260 | return -1; |
| 261 | |
| 262 | rd = read(fd, buf, 50); |
| 263 | if (rd == -1) { |
| 264 | sys_errmsg("cannot read \"%s\"", file); |
| 265 | goto out_error; |
| 266 | } |
| 267 | if (rd == 50) { |
| 268 | errmsg("contents of \"%s\" is too long", file); |
| 269 | errno = EINVAL; |
| 270 | goto out_error; |
| 271 | } |
| 272 | |
| 273 | if (sscanf(buf, "%lld\n", value) != 1) { |
| 274 | errmsg("cannot read integer from \"%s\"\n", file); |
| 275 | errno = EINVAL; |
| 276 | goto out_error; |
| 277 | } |
| 278 | |
| 279 | if (*value < 0) { |
| 280 | errmsg("negative value %lld in \"%s\"", *value, file); |
| 281 | errno = EINVAL; |
| 282 | goto out_error; |
| 283 | } |
| 284 | |
| 285 | if (close(fd)) |
| 286 | return sys_errmsg("close failed on \"%s\"", file); |
| 287 | |
| 288 | return 0; |
| 289 | |
| 290 | out_error: |
| 291 | close(fd); |
| 292 | return -1; |
| 293 | } |
| 294 | |
| 295 | /** |
| 296 | * read_hex_int - read an 'int' value from a file. |
| 297 | * @file: the file to read from |
| 298 | * @value: the result is stored here |
| 299 | * |
| 300 | * This function is the same as 'read_pos_ll()', but it reads an 'int' |
| 301 | * value, not 'long long'. |
| 302 | */ |
| 303 | static int read_hex_int(const char *file, int *value) |
| 304 | { |
| 305 | long long res; |
| 306 | |
| 307 | if (read_hex_ll(file, &res)) |
| 308 | return -1; |
| 309 | |
| 310 | /* Make sure the value has correct range */ |
| 311 | if (res > INT_MAX || res < INT_MIN) { |
| 312 | errmsg("value %lld read from file \"%s\" is out of range", |
| 313 | res, file); |
| 314 | errno = EINVAL; |
| 315 | return -1; |
| 316 | } |
| 317 | |
| 318 | *value = res; |
| 319 | return 0; |
| 320 | } |
| 321 | |
| 322 | /** |
| 323 | * read_pos_int - read a positive 'int' value from a file. |
| 324 | * @file: the file to read from |
| 325 | * @value: the result is stored here |
| 326 | * |
| 327 | * This function is the same as 'read_pos_ll()', but it reads an 'int' |
| 328 | * value, not 'long long'. |
| 329 | */ |
| 330 | static int read_pos_int(const char *file, int *value) |
| 331 | { |
| 332 | long long res; |
| 333 | |
| 334 | if (read_pos_ll(file, &res)) |
| 335 | return -1; |
| 336 | |
| 337 | /* Make sure the value is not too big */ |
| 338 | if (res > INT_MAX) { |
| 339 | errmsg("value %lld read from file \"%s\" is out of range", |
| 340 | res, file); |
| 341 | errno = EINVAL; |
| 342 | return -1; |
| 343 | } |
| 344 | |
| 345 | *value = res; |
| 346 | return 0; |
| 347 | } |
| 348 | |
| 349 | /** |
| 350 | * dev_read_hex_int - read an hex 'int' value from an MTD device sysfs file. |
| 351 | * @patt: file pattern to read from |
| 352 | * @mtd_num: MTD device number |
| 353 | * @value: the result is stored here |
| 354 | * |
| 355 | * This function returns %0 in case of success and %-1 in case of failure. |
| 356 | */ |
| 357 | static int dev_read_hex_int(const char *patt, int mtd_num, int *value) |
| 358 | { |
| 359 | char file[strlen(patt) + 50]; |
| 360 | |
| 361 | sprintf(file, patt, mtd_num); |
| 362 | return read_hex_int(file, value); |
| 363 | } |
| 364 | |
| 365 | /** |
| 366 | * dev_read_pos_int - read a positive 'int' value from an MTD device sysfs file. |
| 367 | * @patt: file pattern to read from |
| 368 | * @mtd_num: MTD device number |
| 369 | * @value: the result is stored here |
| 370 | * |
| 371 | * This function returns %0 in case of success and %-1 in case of failure. |
| 372 | */ |
| 373 | static int dev_read_pos_int(const char *patt, int mtd_num, int *value) |
| 374 | { |
| 375 | char file[strlen(patt) + 50]; |
| 376 | |
| 377 | sprintf(file, patt, mtd_num); |
| 378 | return read_pos_int(file, value); |
| 379 | } |
| 380 | |
| 381 | /** |
| 382 | * dev_read_pos_ll - read a positive 'long long' value from an MTD device sysfs file. |
| 383 | * @patt: file pattern to read from |
| 384 | * @mtd_num: MTD device number |
| 385 | * @value: the result is stored here |
| 386 | * |
| 387 | * This function returns %0 in case of success and %-1 in case of failure. |
| 388 | */ |
| 389 | static int dev_read_pos_ll(const char *patt, int mtd_num, long long *value) |
| 390 | { |
| 391 | char file[strlen(patt) + 50]; |
| 392 | |
| 393 | sprintf(file, patt, mtd_num); |
| 394 | return read_pos_ll(file, value); |
| 395 | } |
| 396 | |
| 397 | /** |
| 398 | * type_str2int - convert MTD device type to integer. |
| 399 | * @str: MTD device type string to convert |
| 400 | * |
| 401 | * This function converts MTD device type string @str, read from sysfs, into an |
| 402 | * integer. |
| 403 | */ |
| 404 | static int type_str2int(const char *str) |
| 405 | { |
| 406 | if (!strcmp(str, "nand")) |
| 407 | return MTD_NANDFLASH; |
| 408 | if (!strcmp(str, "mlc-nand")) |
| 409 | return MTD_MLCNANDFLASH; |
| 410 | if (!strcmp(str, "nor")) |
| 411 | return MTD_NORFLASH; |
| 412 | if (!strcmp(str, "rom")) |
| 413 | return MTD_ROM; |
| 414 | if (!strcmp(str, "absent")) |
| 415 | return MTD_ABSENT; |
| 416 | if (!strcmp(str, "dataflash")) |
| 417 | return MTD_DATAFLASH; |
| 418 | if (!strcmp(str, "ram")) |
| 419 | return MTD_RAM; |
| 420 | if (!strcmp(str, "ubi")) |
| 421 | return MTD_UBIVOLUME; |
| 422 | return -1; |
| 423 | } |
| 424 | |
| 425 | /** |
| 426 | * dev_node2num - find UBI device number by its character device node. |
| 427 | * @lib: MTD library descriptor |
| 428 | * @node: name of the MTD device node |
| 429 | * @mtd_num: MTD device number is returned here |
| 430 | * |
| 431 | * This function returns %0 in case of success and %-1 in case of failure. |
| 432 | */ |
| 433 | static int dev_node2num(struct libmtd *lib, const char *node, int *mtd_num) |
| 434 | { |
| 435 | struct stat st; |
| 436 | int i, mjr, mnr; |
| 437 | struct mtd_info info; |
| 438 | |
| 439 | if (stat(node, &st)) |
| 440 | return sys_errmsg("cannot get information about \"%s\"", node); |
| 441 | |
| 442 | if (!S_ISCHR(st.st_mode)) { |
| 443 | errmsg("\"%s\" is not a character device", node); |
| 444 | errno = EINVAL; |
| 445 | return -1; |
| 446 | } |
| 447 | |
| 448 | mjr = major(st.st_rdev); |
| 449 | mnr = minor(st.st_rdev); |
| 450 | |
| 451 | if (mtd_get_info((libmtd_t *)lib, &info)) |
| 452 | return -1; |
| 453 | |
| 454 | for (i = info.lowest_mtd_num; i <= info.highest_mtd_num; i++) { |
| 455 | int mjr1, mnr1, ret; |
| 456 | |
| 457 | ret = dev_get_major(lib, i, &mjr1, &mnr1); |
| 458 | if (ret) { |
| 459 | if (errno == ENOENT) |
| 460 | continue; |
| 461 | if (!errno) |
| 462 | break; |
| 463 | return -1; |
| 464 | } |
| 465 | |
| 466 | if (mjr1 == mjr && mnr1 == mnr) { |
| 467 | errno = 0; |
| 468 | *mtd_num = i; |
| 469 | return 0; |
| 470 | } |
| 471 | } |
| 472 | |
| 473 | errno = ENODEV; |
| 474 | return -1; |
| 475 | } |
| 476 | |
| 477 | /** |
| 478 | * sysfs_is_supported - check whether the MTD sub-system supports MTD. |
| 479 | * @lib: MTD library descriptor |
| 480 | * |
| 481 | * The Linux kernel MTD subsystem gained MTD support starting from kernel |
| 482 | * 2.6.30 and libmtd tries to use sysfs interface if possible, because the NAND |
| 483 | * sub-page size is available there (and not available at all in pre-sysfs |
| 484 | * kernels). |
| 485 | * |
| 486 | * Very old kernels did not have "/sys/class/mtd" directory. Not very old |
| 487 | * kernels (e.g., 2.6.29) did have "/sys/class/mtd/mtdX" directories, by there |
| 488 | * were no files there, e.g., the "name" file was not present. So all we can do |
| 489 | * is to check for a "/sys/class/mtd/mtdX/name" file. But this is not a |
| 490 | * reliable check, because if this is a new system with no MTD devices - we'll |
| 491 | * treat it as a pre-sysfs system. |
| 492 | */ |
| 493 | static int sysfs_is_supported(struct libmtd *lib) |
| 494 | { |
| 495 | int fd, num = -1; |
| 496 | DIR *sysfs_mtd; |
| 497 | char file[strlen(lib->mtd_name) + 10]; |
| 498 | |
| 499 | sysfs_mtd = opendir(lib->sysfs_mtd); |
| 500 | if (!sysfs_mtd) { |
| 501 | if (errno == ENOENT) { |
| 502 | errno = 0; |
| 503 | return 0; |
| 504 | } |
| 505 | return sys_errmsg("cannot open \"%s\"", lib->sysfs_mtd); |
| 506 | } |
| 507 | |
| 508 | /* |
| 509 | * First of all find an "mtdX" directory. This is needed because there |
| 510 | * may be, for example, mtd1 but no mtd0. |
| 511 | */ |
| 512 | while (1) { |
| 513 | int ret, mtd_num; |
| 514 | char tmp_buf[256]; |
| 515 | struct dirent *dirent; |
| 516 | |
| 517 | dirent = readdir(sysfs_mtd); |
| 518 | if (!dirent) |
| 519 | break; |
| 520 | |
| 521 | if (strlen(dirent->d_name) >= 255) { |
| 522 | errmsg("invalid entry in %s: \"%s\"", |
| 523 | lib->sysfs_mtd, dirent->d_name); |
| 524 | errno = EINVAL; |
| 525 | closedir(sysfs_mtd); |
| 526 | return -1; |
| 527 | } |
| 528 | |
| 529 | ret = sscanf(dirent->d_name, MTD_NAME_PATT"%s", |
| 530 | &mtd_num, tmp_buf); |
| 531 | if (ret == 1) { |
| 532 | num = mtd_num; |
| 533 | break; |
| 534 | } |
| 535 | } |
| 536 | |
| 537 | if (closedir(sysfs_mtd)) |
| 538 | return sys_errmsg("closedir failed on \"%s\"", lib->sysfs_mtd); |
| 539 | |
| 540 | if (num == -1) |
| 541 | /* No mtd device, treat this as pre-sysfs system */ |
| 542 | return 0; |
| 543 | |
| 544 | sprintf(file, lib->mtd_name, num); |
| 545 | fd = open(file, O_RDONLY | O_CLOEXEC); |
| 546 | if (fd == -1) |
| 547 | return 0; |
| 548 | |
| 549 | if (close(fd)) { |
| 550 | sys_errmsg("close failed on \"%s\"", file); |
| 551 | return -1; |
| 552 | } |
| 553 | |
| 554 | return 1; |
| 555 | } |
| 556 | |
| 557 | libmtd_t libmtd_open(void) |
| 558 | { |
| 559 | struct libmtd *lib; |
| 560 | |
| 561 | lib = xzalloc(sizeof(*lib)); |
| 562 | |
| 563 | lib->offs64_ioctls = OFFS64_IOCTLS_UNKNOWN; |
| 564 | |
| 565 | lib->sysfs_mtd = mkpath("/sys", SYSFS_MTD); |
| 566 | if (!lib->sysfs_mtd) |
| 567 | goto out_error; |
| 568 | |
| 569 | lib->mtd = mkpath(lib->sysfs_mtd, MTD_NAME_PATT); |
| 570 | if (!lib->mtd) |
| 571 | goto out_error; |
| 572 | |
| 573 | lib->mtd_name = mkpath(lib->mtd, MTD_NAME); |
| 574 | if (!lib->mtd_name) |
| 575 | goto out_error; |
| 576 | |
| 577 | if (!sysfs_is_supported(lib)) { |
| 578 | free(lib->mtd); |
| 579 | free(lib->sysfs_mtd); |
| 580 | free(lib->mtd_name); |
| 581 | lib->mtd_name = lib->mtd = lib->sysfs_mtd = NULL; |
| 582 | return lib; |
| 583 | } |
| 584 | |
| 585 | lib->mtd_dev = mkpath(lib->mtd, MTD_DEV); |
| 586 | if (!lib->mtd_dev) |
| 587 | goto out_error; |
| 588 | |
| 589 | lib->mtd_type = mkpath(lib->mtd, MTD_TYPE); |
| 590 | if (!lib->mtd_type) |
| 591 | goto out_error; |
| 592 | |
| 593 | lib->mtd_eb_size = mkpath(lib->mtd, MTD_EB_SIZE); |
| 594 | if (!lib->mtd_eb_size) |
| 595 | goto out_error; |
| 596 | |
| 597 | lib->mtd_size = mkpath(lib->mtd, MTD_SIZE); |
| 598 | if (!lib->mtd_size) |
| 599 | goto out_error; |
| 600 | |
| 601 | lib->mtd_min_io_size = mkpath(lib->mtd, MTD_MIN_IO_SIZE); |
| 602 | if (!lib->mtd_min_io_size) |
| 603 | goto out_error; |
| 604 | |
| 605 | lib->mtd_subpage_size = mkpath(lib->mtd, MTD_SUBPAGE_SIZE); |
| 606 | if (!lib->mtd_subpage_size) |
| 607 | goto out_error; |
| 608 | |
| 609 | lib->mtd_oob_size = mkpath(lib->mtd, MTD_OOB_SIZE); |
| 610 | if (!lib->mtd_oob_size) |
| 611 | goto out_error; |
| 612 | |
| 613 | lib->mtd_region_cnt = mkpath(lib->mtd, MTD_REGION_CNT); |
| 614 | if (!lib->mtd_region_cnt) |
| 615 | goto out_error; |
| 616 | |
| 617 | lib->mtd_flags = mkpath(lib->mtd, MTD_FLAGS); |
| 618 | if (!lib->mtd_flags) |
| 619 | goto out_error; |
| 620 | |
| 621 | lib->sysfs_supported = 1; |
| 622 | return lib; |
| 623 | |
| 624 | out_error: |
| 625 | libmtd_close((libmtd_t)lib); |
| 626 | return NULL; |
| 627 | } |
| 628 | |
| 629 | void libmtd_close(libmtd_t desc) |
| 630 | { |
| 631 | struct libmtd *lib = (struct libmtd *)desc; |
| 632 | |
| 633 | free(lib->mtd_flags); |
| 634 | free(lib->mtd_region_cnt); |
| 635 | free(lib->mtd_oob_size); |
| 636 | free(lib->mtd_subpage_size); |
| 637 | free(lib->mtd_min_io_size); |
| 638 | free(lib->mtd_size); |
| 639 | free(lib->mtd_eb_size); |
| 640 | free(lib->mtd_type); |
| 641 | free(lib->mtd_dev); |
| 642 | free(lib->mtd_name); |
| 643 | free(lib->mtd); |
| 644 | free(lib->sysfs_mtd); |
| 645 | free(lib); |
| 646 | } |
| 647 | |
| 648 | int mtd_dev_present(libmtd_t desc, int mtd_num) { |
| 649 | struct stat st; |
| 650 | struct libmtd *lib = (struct libmtd *)desc; |
| 651 | |
| 652 | if (!lib->sysfs_supported) { |
| 653 | return legacy_dev_present(mtd_num) == 1; |
| 654 | } else { |
| 655 | char file[strlen(lib->mtd) + 10]; |
| 656 | |
| 657 | sprintf(file, lib->mtd, mtd_num); |
| 658 | return !stat(file, &st); |
| 659 | } |
| 660 | } |
| 661 | |
| 662 | int mtd_get_info(libmtd_t desc, struct mtd_info *info) |
| 663 | { |
| 664 | DIR *sysfs_mtd; |
| 665 | struct dirent *dirent; |
| 666 | struct libmtd *lib = (struct libmtd *)desc; |
| 667 | |
| 668 | memset(info, 0, sizeof(struct mtd_info)); |
| 669 | |
| 670 | if (!lib->sysfs_supported) |
| 671 | return legacy_mtd_get_info(info); |
| 672 | |
| 673 | info->sysfs_supported = 1; |
| 674 | |
| 675 | /* |
| 676 | * We have to scan the MTD sysfs directory to identify how many MTD |
| 677 | * devices are present. |
| 678 | */ |
| 679 | sysfs_mtd = opendir(lib->sysfs_mtd); |
| 680 | if (!sysfs_mtd) { |
| 681 | if (errno == ENOENT) { |
| 682 | errno = ENODEV; |
| 683 | return -1; |
| 684 | } |
| 685 | return sys_errmsg("cannot open \"%s\"", lib->sysfs_mtd); |
| 686 | } |
| 687 | |
| 688 | info->lowest_mtd_num = INT_MAX; |
| 689 | while (1) { |
| 690 | int mtd_num, ret; |
| 691 | char tmp_buf[256]; |
| 692 | |
| 693 | errno = 0; |
| 694 | dirent = readdir(sysfs_mtd); |
| 695 | if (!dirent) |
| 696 | break; |
| 697 | |
| 698 | if (strlen(dirent->d_name) >= 255) { |
| 699 | errmsg("invalid entry in %s: \"%s\"", |
| 700 | lib->sysfs_mtd, dirent->d_name); |
| 701 | errno = EINVAL; |
| 702 | goto out_close; |
| 703 | } |
| 704 | |
| 705 | ret = sscanf(dirent->d_name, MTD_NAME_PATT"%s", |
| 706 | &mtd_num, tmp_buf); |
| 707 | if (ret == 1) { |
| 708 | info->mtd_dev_cnt += 1; |
| 709 | if (mtd_num > info->highest_mtd_num) |
| 710 | info->highest_mtd_num = mtd_num; |
| 711 | if (mtd_num < info->lowest_mtd_num) |
| 712 | info->lowest_mtd_num = mtd_num; |
| 713 | } |
| 714 | } |
| 715 | |
| 716 | if (!dirent && errno) { |
| 717 | sys_errmsg("readdir failed on \"%s\"", lib->sysfs_mtd); |
| 718 | goto out_close; |
| 719 | } |
| 720 | |
| 721 | if (closedir(sysfs_mtd)) |
| 722 | return sys_errmsg("closedir failed on \"%s\"", lib->sysfs_mtd); |
| 723 | |
| 724 | if (info->lowest_mtd_num == INT_MAX) |
| 725 | info->lowest_mtd_num = 0; |
| 726 | |
| 727 | return 0; |
| 728 | |
| 729 | out_close: |
| 730 | closedir(sysfs_mtd); |
| 731 | return -1; |
| 732 | } |
| 733 | |
| 734 | int mtd_get_dev_info1(libmtd_t desc, int mtd_num, struct mtd_dev_info *mtd) |
| 735 | { |
| 736 | int ret; |
| 737 | struct libmtd *lib = (struct libmtd *)desc; |
| 738 | |
| 739 | memset(mtd, 0, sizeof(struct mtd_dev_info)); |
| 740 | mtd->mtd_num = mtd_num; |
| 741 | |
| 742 | if (!mtd_dev_present(desc, mtd_num)) { |
| 743 | errno = ENODEV; |
| 744 | return -1; |
| 745 | } else if (!lib->sysfs_supported) |
| 746 | return legacy_get_dev_info1(mtd_num, mtd); |
| 747 | |
| 748 | if (dev_get_major(lib, mtd_num, &mtd->major, &mtd->minor)) |
| 749 | return -1; |
| 750 | |
| 751 | ret = dev_read_data(lib->mtd_name, mtd_num, &mtd->name, |
| 752 | MTD_NAME_MAX + 1); |
| 753 | if (ret < 0) |
| 754 | return -1; |
| 755 | ((char *)mtd->name)[ret - 1] = '\0'; |
| 756 | |
| 757 | ret = dev_read_data(lib->mtd_type, mtd_num, &mtd->type_str, |
| 758 | MTD_TYPE_MAX + 1); |
| 759 | if (ret < 0) |
| 760 | return -1; |
| 761 | ((char *)mtd->type_str)[ret - 1] = '\0'; |
| 762 | |
| 763 | if (dev_read_pos_int(lib->mtd_eb_size, mtd_num, &mtd->eb_size)) |
| 764 | return -1; |
| 765 | if (dev_read_pos_ll(lib->mtd_size, mtd_num, &mtd->size)) |
| 766 | return -1; |
| 767 | if (dev_read_pos_int(lib->mtd_min_io_size, mtd_num, &mtd->min_io_size)) |
| 768 | return -1; |
| 769 | if (dev_read_pos_int(lib->mtd_subpage_size, mtd_num, &mtd->subpage_size)) |
| 770 | return -1; |
| 771 | if (dev_read_pos_int(lib->mtd_oob_size, mtd_num, &mtd->oob_size)) |
| 772 | return -1; |
| 773 | if (dev_read_pos_int(lib->mtd_region_cnt, mtd_num, &mtd->region_cnt)) |
| 774 | return -1; |
| 775 | if (dev_read_hex_int(lib->mtd_flags, mtd_num, &ret)) |
| 776 | return -1; |
| 777 | mtd->writable = !!(ret & MTD_WRITEABLE); |
| 778 | |
| 779 | mtd->eb_cnt = mtd->size / mtd->eb_size; |
| 780 | mtd->type = type_str2int(mtd->type_str); |
| 781 | mtd->bb_allowed = !!(mtd->type == MTD_NANDFLASH || |
| 782 | mtd->type == MTD_MLCNANDFLASH); |
| 783 | |
| 784 | return 0; |
| 785 | } |
| 786 | |
| 787 | int mtd_get_dev_info(libmtd_t desc, const char *node, struct mtd_dev_info *mtd) |
| 788 | { |
| 789 | int mtd_num; |
| 790 | struct libmtd *lib = (struct libmtd *)desc; |
| 791 | |
| 792 | if (!lib->sysfs_supported) |
| 793 | return legacy_get_dev_info(node, mtd); |
| 794 | |
| 795 | if (dev_node2num(lib, node, &mtd_num)) |
| 796 | return -1; |
| 797 | |
| 798 | return mtd_get_dev_info1(desc, mtd_num, mtd); |
| 799 | } |
| 800 | |
| 801 | static inline int mtd_ioctl_error(const struct mtd_dev_info *mtd, int eb, |
| 802 | const char *sreq) |
| 803 | { |
| 804 | return sys_errmsg("%s ioctl failed for eraseblock %d (mtd%d)", |
| 805 | sreq, eb, mtd->mtd_num); |
| 806 | } |
| 807 | |
| 808 | static int mtd_valid_erase_block(const struct mtd_dev_info *mtd, int eb) |
| 809 | { |
| 810 | if (eb < 0 || eb >= mtd->eb_cnt) { |
| 811 | errmsg("bad eraseblock number %d, mtd%d has %d eraseblocks", |
| 812 | eb, mtd->mtd_num, mtd->eb_cnt); |
| 813 | errno = EINVAL; |
| 814 | return -1; |
| 815 | } |
| 816 | return 0; |
| 817 | } |
| 818 | |
| 819 | static int mtd_xlock(const struct mtd_dev_info *mtd, int fd, int eb, int req, |
| 820 | const char *sreq) |
| 821 | { |
| 822 | int ret; |
| 823 | struct erase_info_user ei; |
| 824 | |
| 825 | ret = mtd_valid_erase_block(mtd, eb); |
| 826 | if (ret) |
| 827 | return ret; |
| 828 | |
| 829 | ei.start = eb * mtd->eb_size; |
| 830 | ei.length = mtd->eb_size; |
| 831 | |
| 832 | ret = ioctl(fd, req, &ei); |
| 833 | if (ret < 0) |
| 834 | return mtd_ioctl_error(mtd, eb, sreq); |
| 835 | |
| 836 | return 0; |
| 837 | } |
| 838 | #define mtd_xlock(mtd, fd, eb, req) mtd_xlock(mtd, fd, eb, req, #req) |
| 839 | |
| 840 | int mtd_lock(const struct mtd_dev_info *mtd, int fd, int eb) |
| 841 | { |
| 842 | return mtd_xlock(mtd, fd, eb, MEMLOCK); |
| 843 | } |
| 844 | |
| 845 | int mtd_unlock(const struct mtd_dev_info *mtd, int fd, int eb) |
| 846 | { |
| 847 | return mtd_xlock(mtd, fd, eb, MEMUNLOCK); |
| 848 | } |
| 849 | |
| 850 | int mtd_erase(libmtd_t desc, const struct mtd_dev_info *mtd, int fd, int eb) |
| 851 | { |
| 852 | int ret; |
| 853 | struct libmtd *lib = (struct libmtd *)desc; |
| 854 | struct erase_info_user64 ei64; |
| 855 | struct erase_info_user ei; |
| 856 | |
| 857 | ret = mtd_valid_erase_block(mtd, eb); |
| 858 | if (ret) |
| 859 | return ret; |
| 860 | |
| 861 | ei64.start = (__u64)eb * mtd->eb_size; |
| 862 | ei64.length = mtd->eb_size; |
| 863 | |
| 864 | if (lib->offs64_ioctls == OFFS64_IOCTLS_SUPPORTED || |
| 865 | lib->offs64_ioctls == OFFS64_IOCTLS_UNKNOWN) { |
| 866 | ret = ioctl(fd, MEMERASE64, &ei64); |
| 867 | if (ret == 0) |
| 868 | return ret; |
| 869 | |
| 870 | if (errno != ENOTTY || |
| 871 | lib->offs64_ioctls != OFFS64_IOCTLS_UNKNOWN) |
| 872 | return mtd_ioctl_error(mtd, eb, "MEMERASE64"); |
| 873 | |
| 874 | /* |
| 875 | * MEMERASE64 support was added in kernel version 2.6.31, so |
| 876 | * probably we are working with older kernel and this ioctl is |
| 877 | * not supported. |
| 878 | */ |
| 879 | lib->offs64_ioctls = OFFS64_IOCTLS_NOT_SUPPORTED; |
| 880 | } |
| 881 | |
| 882 | if (ei64.start + ei64.length > 0xFFFFFFFF) { |
| 883 | errmsg("this system can address only %u eraseblocks", |
| 884 | 0xFFFFFFFFU / mtd->eb_size); |
| 885 | errno = EINVAL; |
| 886 | return -1; |
| 887 | } |
| 888 | |
| 889 | ei.start = ei64.start; |
| 890 | ei.length = ei64.length; |
| 891 | ret = ioctl(fd, MEMERASE, &ei); |
| 892 | if (ret < 0) |
| 893 | return mtd_ioctl_error(mtd, eb, "MEMERASE"); |
| 894 | return 0; |
| 895 | } |
| 896 | |
| 897 | int mtd_regioninfo(int fd, int regidx, struct region_info_user *reginfo) |
| 898 | { |
| 899 | int ret; |
| 900 | |
| 901 | if (regidx < 0) { |
| 902 | errno = ENODEV; |
| 903 | return -1; |
| 904 | } |
| 905 | |
| 906 | reginfo->regionindex = regidx; |
| 907 | |
| 908 | ret = ioctl(fd, MEMGETREGIONINFO, reginfo); |
| 909 | if (ret < 0) |
| 910 | return sys_errmsg("%s ioctl failed for erase region %d", |
| 911 | "MEMGETREGIONINFO", regidx); |
| 912 | |
| 913 | return 0; |
| 914 | } |
| 915 | |
| 916 | int mtd_is_locked(const struct mtd_dev_info *mtd, int fd, int eb) |
| 917 | { |
| 918 | int ret; |
| 919 | erase_info_t ei; |
| 920 | |
| 921 | ei.start = eb * mtd->eb_size; |
| 922 | ei.length = mtd->eb_size; |
| 923 | |
| 924 | ret = ioctl(fd, MEMISLOCKED, &ei); |
| 925 | if (ret < 0) { |
| 926 | if (errno != ENOTTY && errno != EOPNOTSUPP) |
| 927 | return mtd_ioctl_error(mtd, eb, "MEMISLOCKED"); |
| 928 | else |
| 929 | errno = EOPNOTSUPP; |
| 930 | } |
| 931 | |
| 932 | return ret; |
| 933 | } |
| 934 | |
| 935 | /* Patterns to write to a physical eraseblock when torturing it */ |
| 936 | static uint8_t patterns[] = {0xa5, 0x5a, 0x0}; |
| 937 | |
| 938 | /** |
| 939 | * check_pattern - check if buffer contains only a certain byte pattern. |
| 940 | * @buf: buffer to check |
| 941 | * @patt: the pattern to check |
| 942 | * @size: buffer size in bytes |
| 943 | * |
| 944 | * This function returns %1 in there are only @patt bytes in @buf, and %0 if |
| 945 | * something else was also found. |
| 946 | */ |
| 947 | static int check_pattern(const void *buf, uint8_t patt, int size) |
| 948 | { |
| 949 | int i; |
| 950 | |
| 951 | for (i = 0; i < size; i++) |
| 952 | if (((const uint8_t *)buf)[i] != patt) |
| 953 | return 0; |
| 954 | return 1; |
| 955 | } |
| 956 | |
| 957 | int mtd_torture(libmtd_t desc, const struct mtd_dev_info *mtd, int fd, int eb) |
| 958 | { |
| 959 | int err, i, patt_count; |
| 960 | void *buf; |
| 961 | |
| 962 | normsg("run torture test for PEB %d", eb); |
| 963 | patt_count = ARRAY_SIZE(patterns); |
| 964 | |
| 965 | buf = xmalloc(mtd->eb_size); |
| 966 | |
| 967 | for (i = 0; i < patt_count; i++) { |
| 968 | err = mtd_erase(desc, mtd, fd, eb); |
| 969 | if (err) |
| 970 | goto out; |
| 971 | |
| 972 | /* Make sure the PEB contains only 0xFF bytes */ |
| 973 | err = mtd_read(mtd, fd, eb, 0, buf, mtd->eb_size); |
| 974 | if (err) |
| 975 | goto out; |
| 976 | |
| 977 | err = check_pattern(buf, 0xFF, mtd->eb_size); |
| 978 | if (err == 0) { |
| 979 | errmsg("erased PEB %d, but a non-0xFF byte found", eb); |
| 980 | errno = EIO; |
| 981 | goto out; |
| 982 | } |
| 983 | |
| 984 | /* Write a pattern and check it */ |
| 985 | memset(buf, patterns[i], mtd->eb_size); |
| 986 | err = mtd_write(desc, mtd, fd, eb, 0, buf, mtd->eb_size, NULL, |
| 987 | 0, 0); |
| 988 | if (err) |
| 989 | goto out; |
| 990 | |
| 991 | memset(buf, ~patterns[i], mtd->eb_size); |
| 992 | err = mtd_read(mtd, fd, eb, 0, buf, mtd->eb_size); |
| 993 | if (err) |
| 994 | goto out; |
| 995 | |
| 996 | err = check_pattern(buf, patterns[i], mtd->eb_size); |
| 997 | if (err == 0) { |
| 998 | errmsg("pattern %x checking failed for PEB %d", |
| 999 | patterns[i], eb); |
| 1000 | errno = EIO; |
| 1001 | goto out; |
| 1002 | } |
| 1003 | } |
| 1004 | |
| 1005 | normsg("PEB %d passed torture test, do not mark it a bad", eb); |
| 1006 | |
| 1007 | out: |
| 1008 | free(buf); |
| 1009 | return -1; |
| 1010 | } |
| 1011 | |
| 1012 | int mtd_is_bad(const struct mtd_dev_info *mtd, int fd, int eb) |
| 1013 | { |
| 1014 | int ret; |
| 1015 | loff_t seek; |
| 1016 | |
| 1017 | ret = mtd_valid_erase_block(mtd, eb); |
| 1018 | if (ret) |
| 1019 | return ret; |
| 1020 | |
| 1021 | if (!mtd->bb_allowed) |
| 1022 | return 0; |
| 1023 | |
| 1024 | seek = (loff_t)eb * mtd->eb_size; |
| 1025 | ret = ioctl(fd, MEMGETBADBLOCK, &seek); |
| 1026 | if (ret == -1) |
| 1027 | return mtd_ioctl_error(mtd, eb, "MEMGETBADBLOCK"); |
| 1028 | return ret; |
| 1029 | } |
| 1030 | |
| 1031 | int mtd_mark_bad(const struct mtd_dev_info *mtd, int fd, int eb) |
| 1032 | { |
| 1033 | int ret; |
| 1034 | loff_t seek; |
| 1035 | |
| 1036 | if (!mtd->bb_allowed) { |
| 1037 | errno = EINVAL; |
| 1038 | return -1; |
| 1039 | } |
| 1040 | |
| 1041 | ret = mtd_valid_erase_block(mtd, eb); |
| 1042 | if (ret) |
| 1043 | return ret; |
| 1044 | |
| 1045 | seek = (loff_t)eb * mtd->eb_size; |
| 1046 | ret = ioctl(fd, MEMSETBADBLOCK, &seek); |
| 1047 | if (ret == -1) |
| 1048 | return mtd_ioctl_error(mtd, eb, "MEMSETBADBLOCK"); |
| 1049 | return 0; |
| 1050 | } |
| 1051 | |
| 1052 | int mtd_read(const struct mtd_dev_info *mtd, int fd, int eb, int offs, |
| 1053 | void *buf, int len) |
| 1054 | { |
| 1055 | int ret, rd = 0; |
| 1056 | off_t seek; |
| 1057 | |
| 1058 | ret = mtd_valid_erase_block(mtd, eb); |
| 1059 | if (ret) |
| 1060 | return ret; |
| 1061 | |
| 1062 | if (offs < 0 || offs + len > mtd->eb_size) { |
| 1063 | errmsg("bad offset %d or length %d, mtd%d eraseblock size is %d", |
| 1064 | offs, len, mtd->mtd_num, mtd->eb_size); |
| 1065 | errno = EINVAL; |
| 1066 | return -1; |
| 1067 | } |
| 1068 | |
| 1069 | /* Seek to the beginning of the eraseblock */ |
| 1070 | seek = (off_t)eb * mtd->eb_size + offs; |
| 1071 | if (lseek(fd, seek, SEEK_SET) != seek) |
| 1072 | return sys_errmsg("cannot seek mtd%d to offset %"PRIdoff_t, |
| 1073 | mtd->mtd_num, seek); |
| 1074 | |
| 1075 | while (rd < len) { |
| 1076 | ret = read(fd, buf, len); |
| 1077 | if (ret < 0) |
| 1078 | return sys_errmsg("cannot read %d bytes from mtd%d (eraseblock %d, offset %d)", |
| 1079 | len, mtd->mtd_num, eb, offs); |
| 1080 | rd += ret; |
| 1081 | } |
| 1082 | |
| 1083 | return 0; |
| 1084 | } |
| 1085 | |
| 1086 | static int legacy_auto_oob_layout(const struct mtd_dev_info *mtd, int fd, |
| 1087 | int ooblen, void *oob) { |
| 1088 | struct nand_oobinfo old_oobinfo; |
| 1089 | int start, len; |
| 1090 | uint8_t *tmp_buf; |
| 1091 | |
| 1092 | /* Read the current oob info */ |
| 1093 | if (ioctl(fd, MEMGETOOBSEL, &old_oobinfo)) |
| 1094 | return sys_errmsg("MEMGETOOBSEL failed"); |
| 1095 | |
| 1096 | tmp_buf = malloc(ooblen); |
| 1097 | memcpy(tmp_buf, oob, ooblen); |
| 1098 | |
| 1099 | /* |
| 1100 | * We use autoplacement and have the oobinfo with the autoplacement |
| 1101 | * information from the kernel available |
| 1102 | */ |
| 1103 | if (old_oobinfo.useecc == MTD_NANDECC_AUTOPLACE) { |
| 1104 | int i, tags_pos = 0; |
| 1105 | for (i = 0; old_oobinfo.oobfree[i][1]; i++) { |
| 1106 | /* Set the reserved bytes to 0xff */ |
| 1107 | start = old_oobinfo.oobfree[i][0]; |
| 1108 | len = old_oobinfo.oobfree[i][1]; |
| 1109 | memcpy(oob + start, tmp_buf + tags_pos, len); |
| 1110 | tags_pos += len; |
| 1111 | } |
| 1112 | } else { |
| 1113 | /* Set at least the ecc byte positions to 0xff */ |
| 1114 | start = old_oobinfo.eccbytes; |
| 1115 | len = mtd->oob_size - start; |
| 1116 | memcpy(oob + start, tmp_buf + start, len); |
| 1117 | } |
| 1118 | free(tmp_buf); |
| 1119 | |
| 1120 | return 0; |
| 1121 | } |
| 1122 | |
| 1123 | int mtd_write(libmtd_t desc, const struct mtd_dev_info *mtd, int fd, int eb, |
| 1124 | int offs, void *data, int len, void *oob, int ooblen, |
| 1125 | uint8_t mode) |
| 1126 | { |
| 1127 | int ret; |
| 1128 | off_t seek; |
| 1129 | struct mtd_write_req ops; |
| 1130 | |
| 1131 | ret = mtd_valid_erase_block(mtd, eb); |
| 1132 | if (ret) |
| 1133 | return ret; |
| 1134 | |
| 1135 | if (offs < 0 || offs + len > mtd->eb_size) { |
| 1136 | errmsg("bad offset %d or length %d, mtd%d eraseblock size is %d", |
| 1137 | offs, len, mtd->mtd_num, mtd->eb_size); |
| 1138 | errno = EINVAL; |
| 1139 | return -1; |
| 1140 | } |
| 1141 | if (offs % mtd->subpage_size) { |
| 1142 | errmsg("write offset %d is not aligned to mtd%d min. I/O size %d", |
| 1143 | offs, mtd->mtd_num, mtd->subpage_size); |
| 1144 | errno = EINVAL; |
| 1145 | return -1; |
| 1146 | } |
| 1147 | if (len % mtd->subpage_size) { |
| 1148 | errmsg("write length %d is not aligned to mtd%d min. I/O size %d", |
| 1149 | len, mtd->mtd_num, mtd->subpage_size); |
| 1150 | errno = EINVAL; |
| 1151 | return -1; |
| 1152 | } |
| 1153 | |
| 1154 | /* Calculate seek address */ |
| 1155 | seek = (off_t)eb * mtd->eb_size + offs; |
| 1156 | |
| 1157 | if (oob) { |
| 1158 | ops.start = seek; |
| 1159 | ops.len = len; |
| 1160 | ops.ooblen = ooblen; |
| 1161 | ops.usr_data = (uint64_t)(unsigned long)data; |
| 1162 | ops.usr_oob = (uint64_t)(unsigned long)oob; |
| 1163 | ops.mode = mode; |
| 1164 | |
| 1165 | ret = ioctl(fd, MEMWRITE, &ops); |
| 1166 | if (ret == 0) |
| 1167 | return 0; |
| 1168 | else if (errno != ENOTTY && errno != EOPNOTSUPP) |
| 1169 | return mtd_ioctl_error(mtd, eb, "MEMWRITE"); |
| 1170 | |
| 1171 | /* Fall back to old OOB ioctl() if necessary */ |
| 1172 | if (mode == MTD_OPS_AUTO_OOB) |
| 1173 | if (legacy_auto_oob_layout(mtd, fd, ooblen, oob)) |
| 1174 | return -1; |
| 1175 | if (mtd_write_oob(desc, mtd, fd, seek, ooblen, oob) < 0) |
| 1176 | return sys_errmsg("cannot write to OOB"); |
| 1177 | } |
| 1178 | if (data) { |
| 1179 | /* Seek to the beginning of the eraseblock */ |
| 1180 | if (lseek(fd, seek, SEEK_SET) != seek) |
| 1181 | return sys_errmsg("cannot seek mtd%d to offset %"PRIdoff_t, |
| 1182 | mtd->mtd_num, seek); |
| 1183 | ret = write(fd, data, len); |
| 1184 | if (ret != len) |
| 1185 | return sys_errmsg("cannot write %d bytes to mtd%d " |
| 1186 | "(eraseblock %d, offset %d)", |
| 1187 | len, mtd->mtd_num, eb, offs); |
| 1188 | } |
| 1189 | |
| 1190 | return 0; |
| 1191 | } |
| 1192 | |
| 1193 | static int do_oob_op(libmtd_t desc, const struct mtd_dev_info *mtd, int fd, |
| 1194 | uint64_t start, uint64_t length, void *data, unsigned int cmd64, |
| 1195 | unsigned int cmd) |
| 1196 | { |
| 1197 | int ret, oob_offs; |
| 1198 | struct mtd_oob_buf64 oob64; |
| 1199 | struct mtd_oob_buf oob; |
| 1200 | unsigned long long max_offs; |
| 1201 | const char *cmd64_str, *cmd_str; |
| 1202 | struct libmtd *lib = (struct libmtd *)desc; |
| 1203 | |
| 1204 | if (cmd64 == MEMREADOOB64) { |
| 1205 | cmd64_str = "MEMREADOOB64"; |
| 1206 | cmd_str = "MEMREADOOB"; |
| 1207 | } else { |
| 1208 | cmd64_str = "MEMWRITEOOB64"; |
| 1209 | cmd_str = "MEMWRITEOOB"; |
| 1210 | } |
| 1211 | |
| 1212 | max_offs = (unsigned long long)mtd->eb_cnt * mtd->eb_size; |
| 1213 | if (start >= max_offs) { |
| 1214 | errmsg("bad page address %" PRIu64 ", mtd%d has %d eraseblocks (%llu bytes)", |
| 1215 | start, mtd->mtd_num, mtd->eb_cnt, max_offs); |
| 1216 | errno = EINVAL; |
| 1217 | return -1; |
| 1218 | } |
| 1219 | |
| 1220 | oob_offs = start & (mtd->min_io_size - 1); |
| 1221 | if (oob_offs + length > mtd->oob_size || length == 0) { |
| 1222 | errmsg("Cannot write %" PRIu64 " OOB bytes to address %" PRIu64 " (OOB offset %u) - mtd%d OOB size is only %d bytes", |
| 1223 | length, start, oob_offs, mtd->mtd_num, mtd->oob_size); |
| 1224 | errno = EINVAL; |
| 1225 | return -1; |
| 1226 | } |
| 1227 | |
| 1228 | oob64.start = start; |
| 1229 | oob64.length = length; |
| 1230 | oob64.usr_ptr = (uint64_t)(unsigned long)data; |
| 1231 | |
| 1232 | if (lib->offs64_ioctls == OFFS64_IOCTLS_SUPPORTED || |
| 1233 | lib->offs64_ioctls == OFFS64_IOCTLS_UNKNOWN) { |
| 1234 | ret = ioctl(fd, cmd64, &oob64); |
| 1235 | if (ret == 0) |
| 1236 | return ret; |
| 1237 | |
| 1238 | if (errno != ENOTTY || |
| 1239 | lib->offs64_ioctls != OFFS64_IOCTLS_UNKNOWN) { |
| 1240 | sys_errmsg("%s ioctl failed for mtd%d, offset %" PRIu64 " (eraseblock %" PRIu64 ")", |
| 1241 | cmd64_str, mtd->mtd_num, start, start / mtd->eb_size); |
| 1242 | } |
| 1243 | |
| 1244 | /* |
| 1245 | * MEMREADOOB64/MEMWRITEOOB64 support was added in kernel |
| 1246 | * version 2.6.31, so probably we are working with older kernel |
| 1247 | * and these ioctls are not supported. |
| 1248 | */ |
| 1249 | lib->offs64_ioctls = OFFS64_IOCTLS_NOT_SUPPORTED; |
| 1250 | } |
| 1251 | |
| 1252 | if (oob64.start > 0xFFFFFFFFULL) { |
| 1253 | errmsg("this system can address only up to address %lu", |
| 1254 | 0xFFFFFFFFUL); |
| 1255 | errno = EINVAL; |
| 1256 | return -1; |
| 1257 | } |
| 1258 | |
| 1259 | oob.start = oob64.start; |
| 1260 | oob.length = oob64.length; |
| 1261 | oob.ptr = data; |
| 1262 | |
| 1263 | ret = ioctl(fd, cmd, &oob); |
| 1264 | if (ret < 0) |
| 1265 | sys_errmsg("%s ioctl failed for mtd%d, offset %" PRIu64 " (eraseblock %" PRIu64 ")", |
| 1266 | cmd_str, mtd->mtd_num, start, start / mtd->eb_size); |
| 1267 | return ret; |
| 1268 | } |
| 1269 | |
| 1270 | int mtd_read_oob(libmtd_t desc, const struct mtd_dev_info *mtd, int fd, |
| 1271 | uint64_t start, uint64_t length, void *data) |
| 1272 | { |
| 1273 | return do_oob_op(desc, mtd, fd, start, length, data, |
| 1274 | MEMREADOOB64, MEMREADOOB); |
| 1275 | } |
| 1276 | |
| 1277 | int mtd_write_oob(libmtd_t desc, const struct mtd_dev_info *mtd, int fd, |
| 1278 | uint64_t start, uint64_t length, void *data) |
| 1279 | { |
| 1280 | return do_oob_op(desc, mtd, fd, start, length, data, |
| 1281 | MEMWRITEOOB64, MEMWRITEOOB); |
| 1282 | } |
| 1283 | |
| 1284 | int mtd_write_img(const struct mtd_dev_info *mtd, int fd, int eb, int offs, |
| 1285 | const char *img_name) |
| 1286 | { |
| 1287 | int tmp, ret, in_fd, len, written = 0; |
| 1288 | off_t seek; |
| 1289 | struct stat st; |
| 1290 | char *buf; |
| 1291 | |
| 1292 | ret = mtd_valid_erase_block(mtd, eb); |
| 1293 | if (ret) |
| 1294 | return ret; |
| 1295 | |
| 1296 | if (offs < 0 || offs >= mtd->eb_size) { |
| 1297 | errmsg("bad offset %d, mtd%d eraseblock size is %d", |
| 1298 | offs, mtd->mtd_num, mtd->eb_size); |
| 1299 | errno = EINVAL; |
| 1300 | return -1; |
| 1301 | } |
| 1302 | if (offs % mtd->subpage_size) { |
| 1303 | errmsg("write offset %d is not aligned to mtd%d min. I/O size %d", |
| 1304 | offs, mtd->mtd_num, mtd->subpage_size); |
| 1305 | errno = EINVAL; |
| 1306 | return -1; |
| 1307 | } |
| 1308 | |
| 1309 | in_fd = open(img_name, O_RDONLY | O_CLOEXEC); |
| 1310 | if (in_fd == -1) |
| 1311 | return sys_errmsg("cannot open \"%s\"", img_name); |
| 1312 | |
| 1313 | if (fstat(in_fd, &st)) { |
| 1314 | sys_errmsg("cannot stat %s", img_name); |
| 1315 | goto out_close; |
| 1316 | } |
| 1317 | |
| 1318 | len = st.st_size; |
| 1319 | if (len % mtd->subpage_size) { |
| 1320 | errmsg("size of \"%s\" is %d byte, which is not aligned to " |
| 1321 | "mtd%d min. I/O size %d", img_name, len, mtd->mtd_num, |
| 1322 | mtd->subpage_size); |
| 1323 | errno = EINVAL; |
| 1324 | goto out_close; |
| 1325 | } |
| 1326 | tmp = (offs + len + mtd->eb_size - 1) / mtd->eb_size; |
| 1327 | if (eb + tmp > mtd->eb_cnt) { |
| 1328 | errmsg("\"%s\" image size is %d bytes, mtd%d size is %d " |
| 1329 | "eraseblocks, the image does not fit if we write it " |
| 1330 | "starting from eraseblock %d, offset %d", |
| 1331 | img_name, len, mtd->mtd_num, mtd->eb_cnt, eb, offs); |
| 1332 | errno = EINVAL; |
| 1333 | goto out_close; |
| 1334 | } |
| 1335 | |
| 1336 | /* Seek to the beginning of the eraseblock */ |
| 1337 | seek = (off_t)eb * mtd->eb_size + offs; |
| 1338 | if (lseek(fd, seek, SEEK_SET) != seek) { |
| 1339 | sys_errmsg("cannot seek mtd%d to offset %"PRIdoff_t, |
| 1340 | mtd->mtd_num, seek); |
| 1341 | goto out_close; |
| 1342 | } |
| 1343 | |
| 1344 | buf = xmalloc(mtd->eb_size); |
| 1345 | |
| 1346 | while (written < len) { |
| 1347 | int rd = 0; |
| 1348 | |
| 1349 | do { |
| 1350 | ret = read(in_fd, buf, mtd->eb_size - offs - rd); |
| 1351 | if (ret == -1) { |
| 1352 | sys_errmsg("cannot read \"%s\"", img_name); |
| 1353 | goto out_free; |
| 1354 | } |
| 1355 | rd += ret; |
| 1356 | } while (ret && rd < mtd->eb_size - offs); |
| 1357 | |
| 1358 | ret = write(fd, buf, rd); |
| 1359 | if (ret != rd) { |
| 1360 | sys_errmsg("cannot write %d bytes to mtd%d (eraseblock %d, offset %d)", |
| 1361 | len, mtd->mtd_num, eb, offs); |
| 1362 | goto out_free; |
| 1363 | } |
| 1364 | |
| 1365 | offs = 0; |
| 1366 | eb += 1; |
| 1367 | written += rd; |
| 1368 | } |
| 1369 | |
| 1370 | free(buf); |
| 1371 | close(in_fd); |
| 1372 | return 0; |
| 1373 | |
| 1374 | out_free: |
| 1375 | free(buf); |
| 1376 | out_close: |
| 1377 | close(in_fd); |
| 1378 | return -1; |
| 1379 | } |
| 1380 | |
| 1381 | int mtd_probe_node(libmtd_t desc, const char *node) |
| 1382 | { |
| 1383 | struct stat st; |
| 1384 | struct mtd_info info; |
| 1385 | int i, mjr, mnr; |
| 1386 | struct libmtd *lib = (struct libmtd *)desc; |
| 1387 | |
| 1388 | if (stat(node, &st)) |
| 1389 | return sys_errmsg("cannot get information about \"%s\"", node); |
| 1390 | |
| 1391 | if (!S_ISCHR(st.st_mode)) { |
| 1392 | errmsg("\"%s\" is not a character device", node); |
| 1393 | errno = EINVAL; |
| 1394 | return -1; |
| 1395 | } |
| 1396 | |
| 1397 | mjr = major(st.st_rdev); |
| 1398 | mnr = minor(st.st_rdev); |
| 1399 | |
| 1400 | if (mtd_get_info((libmtd_t *)lib, &info)) |
| 1401 | return -1; |
| 1402 | |
| 1403 | if (!lib->sysfs_supported) |
| 1404 | return 0; |
| 1405 | |
| 1406 | for (i = info.lowest_mtd_num; i <= info.highest_mtd_num; i++) { |
| 1407 | int mjr1, mnr1, ret; |
| 1408 | |
| 1409 | ret = dev_get_major(lib, i, &mjr1, &mnr1); |
| 1410 | if (ret) { |
| 1411 | if (errno == ENOENT) |
| 1412 | continue; |
| 1413 | if (!errno) |
| 1414 | break; |
| 1415 | return -1; |
| 1416 | } |
| 1417 | |
| 1418 | if (mjr1 == mjr && mnr1 == mnr) |
| 1419 | return 1; |
| 1420 | } |
| 1421 | |
| 1422 | errno = 0; |
| 1423 | return -1; |
| 1424 | } |