Daniel Rosenberg | 9dfb4f6 | 2021-06-10 03:53:52 +0000 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
| 2 | /* |
| 3 | * Copyright (C) 2019 Namjae Jeon <linkinjeon@kernel.org> |
| 4 | */ |
| 5 | |
| 6 | #include <sys/types.h> |
| 7 | #include <sys/stat.h> |
| 8 | #include <sys/ioctl.h> |
| 9 | #include <sys/sysmacros.h> |
| 10 | #include <unistd.h> |
| 11 | #include <fcntl.h> |
| 12 | #include <stdlib.h> |
| 13 | #include <stdio.h> |
| 14 | #include <string.h> |
| 15 | #include <errno.h> |
| 16 | #include <wchar.h> |
| 17 | #include <limits.h> |
| 18 | |
| 19 | #include "exfat_ondisk.h" |
| 20 | #include "libexfat.h" |
| 21 | #include "version.h" |
| 22 | |
| 23 | #define BITS_PER_LONG (sizeof(long) * CHAR_BIT) |
| 24 | |
| 25 | #ifdef WORDS_BIGENDIAN |
| 26 | #define BITOP_LE_SWIZZLE ((BITS_PER_LONG - 1) & ~0x7) |
| 27 | #else |
| 28 | #define BITOP_LE_SWIZZLE 0 |
| 29 | #endif |
| 30 | |
| 31 | #define BIT_MASK(nr) (1UL << ((nr) % BITS_PER_LONG)) |
| 32 | #define BIT_WORD(nr) ((nr) / BITS_PER_LONG) |
| 33 | |
| 34 | unsigned int print_level = EXFAT_INFO; |
| 35 | |
| 36 | static inline void set_bit(int nr, void *addr) |
| 37 | { |
| 38 | unsigned long mask = BIT_MASK(nr); |
| 39 | unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr); |
| 40 | |
| 41 | *p |= mask; |
| 42 | } |
| 43 | |
| 44 | static inline void clear_bit(int nr, void *addr) |
| 45 | { |
| 46 | unsigned long mask = BIT_MASK(nr); |
| 47 | unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr); |
| 48 | |
| 49 | *p &= ~mask; |
| 50 | } |
| 51 | |
| 52 | static inline void set_bit_le(int nr, void *addr) |
| 53 | { |
| 54 | set_bit(nr ^ BITOP_LE_SWIZZLE, addr); |
| 55 | } |
| 56 | |
| 57 | static inline void clear_bit_le(int nr, void *addr) |
| 58 | { |
| 59 | clear_bit(nr ^ BITOP_LE_SWIZZLE, addr); |
| 60 | } |
| 61 | |
| 62 | void exfat_set_bit(struct exfat_blk_dev *bd, char *bitmap, |
| 63 | unsigned int clu) |
| 64 | { |
| 65 | int b; |
| 66 | |
| 67 | b = clu & ((bd->sector_size << 3) - 1); |
| 68 | |
| 69 | set_bit_le(b, bitmap); |
| 70 | } |
| 71 | |
| 72 | void exfat_clear_bit(struct exfat_blk_dev *bd, char *bitmap, |
| 73 | unsigned int clu) |
| 74 | { |
| 75 | int b; |
| 76 | |
| 77 | b = clu & ((bd->sector_size << 3) - 1); |
| 78 | |
| 79 | clear_bit_le(b, bitmap); |
| 80 | } |
| 81 | |
| 82 | wchar_t exfat_bad_char(wchar_t w) |
| 83 | { |
| 84 | return (w < 0x0020) |
| 85 | || (w == '*') || (w == '?') || (w == '<') || (w == '>') |
| 86 | || (w == '|') || (w == '"') || (w == ':') || (w == '/') |
| 87 | || (w == '\\'); |
| 88 | } |
| 89 | |
| 90 | void boot_calc_checksum(unsigned char *sector, unsigned short size, |
| 91 | bool is_boot_sec, __le32 *checksum) |
| 92 | { |
| 93 | unsigned int index; |
| 94 | |
| 95 | if (is_boot_sec) { |
| 96 | for (index = 0; index < size; index++) { |
| 97 | if ((index == 106) || (index == 107) || (index == 112)) |
| 98 | continue; |
| 99 | *checksum = ((*checksum & 1) ? 0x80000000 : 0) + |
| 100 | (*checksum >> 1) + sector[index]; |
| 101 | } |
| 102 | } else { |
| 103 | for (index = 0; index < size; index++) { |
| 104 | *checksum = ((*checksum & 1) ? 0x80000000 : 0) + |
| 105 | (*checksum >> 1) + sector[index]; |
| 106 | } |
| 107 | } |
| 108 | } |
| 109 | |
| 110 | void show_version(void) |
| 111 | { |
| 112 | printf("exfatprogs version : %s\n", EXFAT_PROGS_VERSION); |
| 113 | } |
| 114 | |
| 115 | static inline unsigned int sector_size_bits(unsigned int size) |
| 116 | { |
| 117 | unsigned int bits = 8; |
| 118 | |
| 119 | do { |
| 120 | bits++; |
| 121 | size >>= 1; |
| 122 | } while (size > 256); |
| 123 | |
| 124 | return bits; |
| 125 | } |
| 126 | |
| 127 | static void exfat_set_default_cluster_size(struct exfat_blk_dev *bd, |
| 128 | struct exfat_user_input *ui) |
| 129 | { |
| 130 | if (256 * MB >= bd->size) |
| 131 | ui->cluster_size = 4 * KB; |
| 132 | else if (32 * GB >= bd->size) |
| 133 | ui->cluster_size = 32 * KB; |
| 134 | else |
| 135 | ui->cluster_size = 128 * KB; |
| 136 | } |
| 137 | |
| 138 | void init_user_input(struct exfat_user_input *ui) |
| 139 | { |
| 140 | memset(ui, 0, sizeof(struct exfat_user_input)); |
| 141 | ui->writeable = true; |
| 142 | ui->quick = true; |
| 143 | } |
| 144 | |
| 145 | int exfat_get_blk_dev_info(struct exfat_user_input *ui, |
| 146 | struct exfat_blk_dev *bd) |
| 147 | { |
| 148 | int fd, ret = -1; |
| 149 | off_t blk_dev_size; |
| 150 | struct stat st; |
| 151 | unsigned long long blk_dev_offset = 0; |
| 152 | |
| 153 | fd = open(ui->dev_name, ui->writeable ? O_RDWR|O_EXCL : O_RDONLY); |
| 154 | if (fd < 0) { |
| 155 | exfat_err("open failed : %s, %s\n", ui->dev_name, |
| 156 | strerror(errno)); |
| 157 | return -1; |
| 158 | } |
| 159 | blk_dev_size = lseek(fd, 0, SEEK_END); |
| 160 | if (blk_dev_size <= 0) { |
| 161 | exfat_err("invalid block device size(%s)\n", |
| 162 | ui->dev_name); |
| 163 | ret = blk_dev_size; |
| 164 | close(fd); |
| 165 | goto out; |
| 166 | } |
| 167 | |
| 168 | if (fstat(fd, &st) == 0 && S_ISBLK(st.st_mode)) { |
| 169 | char pathname[sizeof("/sys/dev/block/4294967295:4294967295/start")]; |
| 170 | FILE *fp; |
| 171 | |
| 172 | snprintf(pathname, sizeof(pathname), "/sys/dev/block/%u:%u/start", |
| 173 | major(st.st_rdev), minor(st.st_rdev)); |
| 174 | fp = fopen(pathname, "r"); |
| 175 | if (fp != NULL) { |
| 176 | if (fscanf(fp, "%llu", &blk_dev_offset) == 1) { |
| 177 | /* |
| 178 | * Linux kernel always reports partition offset |
| 179 | * in 512-byte units, regardless of sector size |
| 180 | */ |
| 181 | blk_dev_offset <<= 9; |
| 182 | } |
| 183 | fclose(fp); |
| 184 | } |
| 185 | } |
| 186 | |
| 187 | bd->dev_fd = fd; |
| 188 | bd->offset = blk_dev_offset; |
| 189 | bd->size = blk_dev_size; |
| 190 | if (!ui->cluster_size) |
| 191 | exfat_set_default_cluster_size(bd, ui); |
| 192 | |
| 193 | if (!ui->boundary_align) |
| 194 | ui->boundary_align = DEFAULT_BOUNDARY_ALIGNMENT; |
| 195 | |
| 196 | if (ioctl(fd, BLKSSZGET, &bd->sector_size) < 0) |
| 197 | bd->sector_size = DEFAULT_SECTOR_SIZE; |
| 198 | bd->sector_size_bits = sector_size_bits(bd->sector_size); |
| 199 | bd->num_sectors = blk_dev_size / DEFAULT_SECTOR_SIZE; |
| 200 | bd->num_clusters = blk_dev_size / ui->cluster_size; |
| 201 | |
| 202 | exfat_debug("Block device name : %s\n", ui->dev_name); |
| 203 | exfat_debug("Block device offset : %llu\n", bd->offset); |
| 204 | exfat_debug("Block device size : %llu\n", bd->size); |
| 205 | exfat_debug("Block sector size : %u\n", bd->sector_size); |
| 206 | exfat_debug("Number of the sectors : %llu\n", |
| 207 | bd->num_sectors); |
| 208 | exfat_debug("Number of the clusters : %u\n", |
| 209 | bd->num_clusters); |
| 210 | |
| 211 | ret = 0; |
| 212 | bd->dev_fd = fd; |
| 213 | out: |
| 214 | return ret; |
| 215 | } |
| 216 | |
| 217 | ssize_t exfat_read(int fd, void *buf, size_t size, off_t offset) |
| 218 | { |
| 219 | return pread(fd, buf, size, offset); |
| 220 | } |
| 221 | |
| 222 | ssize_t exfat_write(int fd, void *buf, size_t size, off_t offset) |
| 223 | { |
| 224 | return pwrite(fd, buf, size, offset); |
| 225 | } |
| 226 | |
| 227 | size_t exfat_utf16_len(const __le16 *str, size_t max_size) |
| 228 | { |
| 229 | size_t i = 0; |
| 230 | |
| 231 | while (le16_to_cpu(str[i]) && i < max_size) |
| 232 | i++; |
| 233 | return i; |
| 234 | } |
| 235 | |
| 236 | ssize_t exfat_utf16_enc(const char *in_str, __u16 *out_str, size_t out_size) |
| 237 | { |
| 238 | size_t mbs_len, out_len, i; |
| 239 | wchar_t *wcs; |
| 240 | |
| 241 | mbs_len = mbstowcs(NULL, in_str, 0); |
| 242 | if (mbs_len == (size_t)-1) { |
| 243 | if (errno == EINVAL || errno == EILSEQ) |
| 244 | exfat_err("invalid character sequence in current locale\n"); |
| 245 | return -errno; |
| 246 | } |
| 247 | |
| 248 | wcs = calloc(mbs_len+1, sizeof(wchar_t)); |
| 249 | if (!wcs) |
| 250 | return -ENOMEM; |
| 251 | |
| 252 | /* First convert multibyte char* string to wchar_t* string */ |
| 253 | if (mbstowcs(wcs, in_str, mbs_len+1) == (size_t)-1) { |
| 254 | if (errno == EINVAL || errno == EILSEQ) |
| 255 | exfat_err("invalid character sequence in current locale\n"); |
| 256 | free(wcs); |
| 257 | return -errno; |
| 258 | } |
| 259 | |
| 260 | /* Convert wchar_t* string (sequence of code points) to UTF-16 string */ |
| 261 | for (i = 0, out_len = 0; i < mbs_len; i++) { |
| 262 | if (2*(out_len+1) > out_size || |
| 263 | (wcs[i] >= 0x10000 && 2*(out_len+2) > out_size)) { |
| 264 | exfat_err("input string is too long\n"); |
| 265 | free(wcs); |
| 266 | return -E2BIG; |
| 267 | } |
| 268 | |
| 269 | /* Encode code point above Plane0 as UTF-16 surrogate pair */ |
| 270 | if (wcs[i] >= 0x10000) { |
| 271 | out_str[out_len++] = |
| 272 | cpu_to_le16(((wcs[i] - 0x10000) >> 10) + 0xD800); |
| 273 | wcs[i] = ((wcs[i] - 0x10000) & 0x3FF) + 0xDC00; |
| 274 | } |
| 275 | |
| 276 | out_str[out_len++] = cpu_to_le16(wcs[i]); |
| 277 | } |
| 278 | |
| 279 | free(wcs); |
| 280 | return 2*out_len; |
| 281 | } |
| 282 | |
| 283 | ssize_t exfat_utf16_dec(const __u16 *in_str, size_t in_len, |
| 284 | char *out_str, size_t out_size) |
| 285 | { |
| 286 | size_t wcs_len, out_len, c_len, i; |
| 287 | char c_str[MB_LEN_MAX]; |
| 288 | wchar_t *wcs; |
| 289 | mbstate_t ps; |
| 290 | wchar_t w; |
| 291 | |
| 292 | wcs = calloc(in_len/2+1, sizeof(wchar_t)); |
| 293 | if (!wcs) |
| 294 | return -ENOMEM; |
| 295 | |
| 296 | /* First convert UTF-16 string to wchar_t* string */ |
| 297 | for (i = 0, wcs_len = 0; i < in_len/2; i++, wcs_len++) { |
| 298 | wcs[wcs_len] = le16_to_cpu(in_str[i]); |
| 299 | /* |
| 300 | * If wchar_t can store code point above Plane0 |
| 301 | * then unpack UTF-16 surrogate pair to code point |
| 302 | */ |
| 303 | #if WCHAR_MAX >= 0x10FFFF |
| 304 | if (wcs[wcs_len] >= 0xD800 && wcs[wcs_len] <= 0xDBFF && |
| 305 | i+1 < in_len/2) { |
| 306 | w = le16_to_cpu(in_str[i+1]); |
| 307 | if (w >= 0xDC00 && w <= 0xDFFF) { |
| 308 | wcs[wcs_len] = 0x10000 + |
| 309 | ((wcs[wcs_len] - 0xD800) << 10) + |
| 310 | (w - 0xDC00); |
| 311 | i++; |
| 312 | } |
| 313 | } |
| 314 | #endif |
| 315 | } |
| 316 | |
| 317 | memset(&ps, 0, sizeof(ps)); |
| 318 | |
| 319 | /* And then convert wchar_t* string to multibyte char* string */ |
| 320 | for (i = 0, out_len = 0, c_len = 0; i <= wcs_len; i++) { |
| 321 | c_len = wcrtomb(c_str, wcs[i], &ps); |
| 322 | /* |
| 323 | * If character is non-representable in current locale then |
| 324 | * try to store it as Unicode replacement code point U+FFFD |
| 325 | */ |
| 326 | if (c_len == (size_t)-1 && errno == EILSEQ) |
| 327 | c_len = wcrtomb(c_str, 0xFFFD, &ps); |
| 328 | /* If U+FFFD is also non-representable, try question mark */ |
| 329 | if (c_len == (size_t)-1 && errno == EILSEQ) |
| 330 | c_len = wcrtomb(c_str, L'?', &ps); |
| 331 | /* If also (7bit) question mark fails then we cannot do more */ |
| 332 | if (c_len == (size_t)-1) { |
| 333 | exfat_err("invalid UTF-16 sequence\n"); |
| 334 | free(wcs); |
| 335 | return -errno; |
| 336 | } |
| 337 | if (out_len+c_len > out_size) { |
| 338 | exfat_err("input string is too long\n"); |
| 339 | free(wcs); |
| 340 | return -E2BIG; |
| 341 | } |
| 342 | memcpy(out_str+out_len, c_str, c_len); |
| 343 | out_len += c_len; |
| 344 | } |
| 345 | |
| 346 | free(wcs); |
| 347 | |
| 348 | /* Last iteration of above loop should have produced null byte */ |
| 349 | if (c_len == 0 || out_str[out_len-1] != 0) { |
| 350 | exfat_err("invalid UTF-16 sequence\n"); |
| 351 | return -errno; |
| 352 | } |
| 353 | |
| 354 | return out_len-1; |
| 355 | } |
| 356 | |
| 357 | off_t exfat_get_root_entry_offset(struct exfat_blk_dev *bd) |
| 358 | { |
| 359 | struct pbr *bs; |
| 360 | int nbytes; |
| 361 | unsigned int cluster_size; |
| 362 | off_t root_clu_off; |
| 363 | |
| 364 | bs = (struct pbr *)malloc(sizeof(struct pbr)); |
| 365 | if (!bs) { |
| 366 | exfat_err("failed to allocate memory\n"); |
| 367 | return -ENOMEM; |
| 368 | } |
| 369 | |
| 370 | nbytes = exfat_read(bd->dev_fd, bs, sizeof(struct pbr), 0); |
| 371 | if (nbytes != sizeof(struct pbr)) { |
| 372 | exfat_err("boot sector read failed: %d\n", errno); |
| 373 | free(bs); |
| 374 | return -1; |
| 375 | } |
| 376 | |
| 377 | cluster_size = (1 << bs->bsx.sect_per_clus_bits) * bd->sector_size; |
| 378 | root_clu_off = le32_to_cpu(bs->bsx.clu_offset) * bd->sector_size + |
| 379 | le32_to_cpu(bs->bsx.root_cluster - EXFAT_RESERVED_CLUSTERS) |
| 380 | * cluster_size; |
| 381 | free(bs); |
| 382 | |
| 383 | return root_clu_off; |
| 384 | } |
| 385 | |
| 386 | char *exfat_conv_volume_label(struct exfat_dentry *vol_entry) |
| 387 | { |
| 388 | char *volume_label; |
| 389 | __le16 disk_label[VOLUME_LABEL_MAX_LEN]; |
| 390 | |
| 391 | volume_label = malloc(VOLUME_LABEL_BUFFER_SIZE); |
| 392 | if (!volume_label) |
| 393 | return NULL; |
| 394 | |
| 395 | memcpy(disk_label, vol_entry->vol_label, sizeof(disk_label)); |
| 396 | memset(volume_label, 0, VOLUME_LABEL_BUFFER_SIZE); |
| 397 | if (exfat_utf16_dec(disk_label, vol_entry->vol_char_cnt*2, |
| 398 | volume_label, VOLUME_LABEL_BUFFER_SIZE) < 0) { |
| 399 | exfat_err("failed to decode volume label\n"); |
| 400 | free(volume_label); |
| 401 | return NULL; |
| 402 | } |
| 403 | |
| 404 | return volume_label; |
| 405 | } |
| 406 | |
| 407 | int exfat_show_volume_label(struct exfat_blk_dev *bd, off_t root_clu_off) |
| 408 | { |
| 409 | struct exfat_dentry *vol_entry; |
| 410 | char *volume_label; |
| 411 | int nbytes; |
| 412 | |
| 413 | vol_entry = malloc(sizeof(struct exfat_dentry)); |
| 414 | if (!vol_entry) { |
| 415 | exfat_err("failed to allocate memory\n"); |
| 416 | return -ENOMEM; |
| 417 | } |
| 418 | |
| 419 | nbytes = exfat_read(bd->dev_fd, vol_entry, |
| 420 | sizeof(struct exfat_dentry), root_clu_off); |
| 421 | if (nbytes != sizeof(struct exfat_dentry)) { |
| 422 | exfat_err("volume entry read failed: %d\n", errno); |
| 423 | free(vol_entry); |
| 424 | return -1; |
| 425 | } |
| 426 | |
| 427 | volume_label = exfat_conv_volume_label(vol_entry); |
| 428 | if (!volume_label) { |
| 429 | free(vol_entry); |
| 430 | return -EINVAL; |
| 431 | } |
| 432 | |
| 433 | exfat_info("label: %s\n", volume_label); |
| 434 | |
| 435 | free(volume_label); |
| 436 | free(vol_entry); |
| 437 | return 0; |
| 438 | } |
| 439 | |
| 440 | int exfat_set_volume_label(struct exfat_blk_dev *bd, |
| 441 | char *label_input, off_t root_clu_off) |
| 442 | { |
| 443 | struct exfat_dentry vol; |
| 444 | int nbytes; |
| 445 | __u16 volume_label[VOLUME_LABEL_MAX_LEN]; |
| 446 | int volume_label_len; |
| 447 | |
| 448 | volume_label_len = exfat_utf16_enc(label_input, |
| 449 | volume_label, sizeof(volume_label)); |
| 450 | if (volume_label_len < 0) { |
| 451 | exfat_err("failed to encode volume label\n"); |
| 452 | return -1; |
| 453 | } |
| 454 | |
| 455 | vol.type = EXFAT_VOLUME; |
| 456 | memset(vol.vol_label, 0, sizeof(vol.vol_label)); |
| 457 | memcpy(vol.vol_label, volume_label, volume_label_len); |
| 458 | vol.vol_char_cnt = volume_label_len/2; |
| 459 | |
| 460 | nbytes = exfat_write(bd->dev_fd, &vol, sizeof(struct exfat_dentry), |
| 461 | root_clu_off); |
| 462 | if (nbytes != sizeof(struct exfat_dentry)) { |
| 463 | exfat_err("volume entry write failed: %d\n", errno); |
| 464 | return -1; |
| 465 | } |
| 466 | fsync(bd->dev_fd); |
| 467 | |
| 468 | exfat_info("new label: %s\n", label_input); |
| 469 | return 0; |
| 470 | } |
| 471 | |
| 472 | int exfat_read_sector(struct exfat_blk_dev *bd, void *buf, unsigned int sec_off) |
| 473 | { |
| 474 | int ret; |
| 475 | unsigned long long offset = sec_off * bd->sector_size; |
| 476 | |
| 477 | lseek(bd->dev_fd, offset, SEEK_SET); |
| 478 | ret = read(bd->dev_fd, buf, bd->sector_size); |
| 479 | if (ret < 0) { |
| 480 | exfat_err("read failed, sec_off : %u\n", sec_off); |
| 481 | return -1; |
| 482 | } |
| 483 | return 0; |
| 484 | } |
| 485 | |
| 486 | int exfat_write_sector(struct exfat_blk_dev *bd, void *buf, |
| 487 | unsigned int sec_off) |
| 488 | { |
| 489 | int bytes; |
| 490 | unsigned long long offset = sec_off * bd->sector_size; |
| 491 | |
| 492 | lseek(bd->dev_fd, offset, SEEK_SET); |
| 493 | bytes = write(bd->dev_fd, buf, bd->sector_size); |
| 494 | if (bytes != (int)bd->sector_size) { |
| 495 | exfat_err("write failed, sec_off : %u, bytes : %d\n", sec_off, |
| 496 | bytes); |
| 497 | return -1; |
| 498 | } |
| 499 | return 0; |
| 500 | } |
| 501 | |
| 502 | int exfat_write_checksum_sector(struct exfat_blk_dev *bd, |
| 503 | unsigned int checksum, bool is_backup) |
| 504 | { |
| 505 | __le32 *checksum_buf; |
| 506 | int ret = 0; |
| 507 | unsigned int i; |
| 508 | unsigned int sec_idx = CHECKSUM_SEC_IDX; |
| 509 | |
| 510 | checksum_buf = malloc(bd->sector_size); |
| 511 | if (!checksum_buf) |
| 512 | return -1; |
| 513 | |
| 514 | if (is_backup) |
| 515 | sec_idx += BACKUP_BOOT_SEC_IDX; |
| 516 | |
| 517 | for (i = 0; i < bd->sector_size / sizeof(int); i++) |
| 518 | checksum_buf[i] = cpu_to_le32(checksum); |
| 519 | |
| 520 | ret = exfat_write_sector(bd, checksum_buf, sec_idx); |
| 521 | if (ret) { |
| 522 | exfat_err("checksum sector write failed\n"); |
| 523 | goto free; |
| 524 | } |
| 525 | |
| 526 | free: |
| 527 | free(checksum_buf); |
| 528 | return ret; |
| 529 | } |
| 530 | |
| 531 | int exfat_show_volume_serial(struct exfat_blk_dev *bd, |
| 532 | struct exfat_user_input *ui) |
| 533 | { |
| 534 | struct pbr *ppbr; |
| 535 | int ret; |
| 536 | |
| 537 | ppbr = malloc(bd->sector_size); |
| 538 | if (!ppbr) { |
| 539 | exfat_err("Cannot allocate pbr: out of memory\n"); |
| 540 | return -1; |
| 541 | } |
| 542 | |
| 543 | /* read main boot sector */ |
| 544 | ret = exfat_read_sector(bd, (char *)ppbr, BOOT_SEC_IDX); |
| 545 | if (ret < 0) { |
| 546 | exfat_err("main boot sector read failed\n"); |
| 547 | ret = -1; |
| 548 | goto free_ppbr; |
| 549 | } |
| 550 | |
| 551 | exfat_info("volume serial : 0x%x\n", ppbr->bsx.vol_serial); |
| 552 | |
| 553 | free_ppbr: |
| 554 | free(ppbr); |
| 555 | return ret; |
| 556 | } |
| 557 | |
| 558 | static int exfat_update_boot_checksum(struct exfat_blk_dev *bd, bool is_backup) |
| 559 | { |
| 560 | unsigned int checksum = 0; |
| 561 | int ret, sec_idx, backup_sec_idx = 0; |
| 562 | int sector_size = bd->sector_size; |
| 563 | unsigned char *buf; |
| 564 | |
| 565 | buf = malloc(bd->sector_size); |
| 566 | if (!buf) { |
| 567 | exfat_err("Cannot allocate pbr: out of memory\n"); |
| 568 | return -1; |
| 569 | } |
| 570 | |
| 571 | if (is_backup) |
| 572 | backup_sec_idx = BACKUP_BOOT_SEC_IDX; |
| 573 | |
| 574 | for (sec_idx = BOOT_SEC_IDX; sec_idx < CHECKSUM_SEC_IDX; sec_idx++) { |
| 575 | bool is_boot_sec = false; |
| 576 | |
| 577 | ret = exfat_read_sector(bd, buf, sec_idx + backup_sec_idx); |
| 578 | if (ret < 0) { |
| 579 | exfat_err("sector(%d) read failed\n", sec_idx); |
| 580 | ret = -1; |
| 581 | goto free_buf; |
| 582 | } |
| 583 | |
| 584 | if (sec_idx == BOOT_SEC_IDX) { |
| 585 | is_boot_sec = true; |
| 586 | sector_size = sizeof(struct pbr); |
| 587 | } else if (sec_idx >= EXBOOT_SEC_IDX && sec_idx < OEM_SEC_IDX) |
| 588 | sector_size = sizeof(struct exbs); |
| 589 | |
| 590 | boot_calc_checksum(buf, sector_size, is_boot_sec, |
| 591 | &checksum); |
| 592 | } |
| 593 | |
| 594 | ret = exfat_write_checksum_sector(bd, checksum, is_backup); |
| 595 | |
| 596 | free_buf: |
| 597 | free(buf); |
| 598 | |
| 599 | return ret; |
| 600 | } |
| 601 | |
| 602 | int exfat_set_volume_serial(struct exfat_blk_dev *bd, |
| 603 | struct exfat_user_input *ui) |
| 604 | { |
| 605 | int ret; |
| 606 | struct pbr *ppbr; |
| 607 | |
| 608 | ppbr = malloc(bd->sector_size); |
| 609 | if (!ppbr) { |
| 610 | exfat_err("Cannot allocate pbr: out of memory\n"); |
| 611 | return -1; |
| 612 | } |
| 613 | |
| 614 | /* read main boot sector */ |
| 615 | ret = exfat_read_sector(bd, (char *)ppbr, BOOT_SEC_IDX); |
| 616 | if (ret < 0) { |
| 617 | exfat_err("main boot sector read failed\n"); |
| 618 | ret = -1; |
| 619 | goto free_ppbr; |
| 620 | } |
| 621 | |
| 622 | ppbr->bsx.vol_serial = ui->volume_serial; |
| 623 | |
| 624 | /* update main boot sector */ |
| 625 | ret = exfat_write_sector(bd, (char *)ppbr, BOOT_SEC_IDX); |
| 626 | if (ret < 0) { |
| 627 | exfat_err("main boot sector write failed\n"); |
| 628 | ret = -1; |
| 629 | goto free_ppbr; |
| 630 | } |
| 631 | |
| 632 | /* update backup boot sector */ |
| 633 | ret = exfat_write_sector(bd, (char *)ppbr, BACKUP_BOOT_SEC_IDX); |
| 634 | if (ret < 0) { |
| 635 | exfat_err("backup boot sector write failed\n"); |
| 636 | ret = -1; |
| 637 | goto free_ppbr; |
| 638 | } |
| 639 | |
| 640 | ret = exfat_update_boot_checksum(bd, 0); |
| 641 | if (ret < 0) { |
| 642 | exfat_err("main checksum update failed\n"); |
| 643 | goto free_ppbr; |
| 644 | } |
| 645 | |
| 646 | ret = exfat_update_boot_checksum(bd, 1); |
| 647 | if (ret < 0) |
| 648 | exfat_err("backup checksum update failed\n"); |
| 649 | free_ppbr: |
| 650 | free(ppbr); |
| 651 | |
| 652 | exfat_info("New volume serial : 0x%x\n", ui->volume_serial); |
| 653 | |
| 654 | return ret; |
| 655 | } |
| 656 | |
| 657 | unsigned int exfat_clus_to_blk_dev_off(struct exfat_blk_dev *bd, |
| 658 | unsigned int clu_off_sectnr, unsigned int clu) |
| 659 | { |
| 660 | return clu_off_sectnr * bd->sector_size + |
| 661 | (clu - EXFAT_RESERVED_CLUSTERS) * bd->cluster_size; |
| 662 | } |