1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (C) 2019 Namjae Jeon <linkinjeon@kernel.org>
4 */
5
6 #include <stdio.h>
7 #include <stdlib.h>
8 #include <stdbool.h>
9 #include <string.h>
10 #include <unistd.h>
11 #include <sys/types.h>
12 #include <sys/stat.h>
13 #include <sys/ioctl.h>
14 #include <fcntl.h>
15 #include <getopt.h>
16 #include <inttypes.h>
17 #include <limits.h>
18 #include <errno.h>
19 #include <locale.h>
20 #include <time.h>
21
22 #include "exfat_ondisk.h"
23 #include "libexfat.h"
24 #include "mkfs.h"
25
26 struct exfat_mkfs_info finfo;
27
28 /* random serial generator based on current time */
get_new_serial(void)29 static unsigned int get_new_serial(void)
30 {
31 struct timespec ts;
32
33 if (clock_gettime(CLOCK_REALTIME, &ts)) {
34 /* set 0000-0000 on error */
35 ts.tv_sec = 0;
36 ts.tv_nsec = 0;
37 }
38
39 return (unsigned int)(ts.tv_nsec << 12 | ts.tv_sec);
40 }
41
exfat_setup_boot_sector(struct pbr * ppbr,struct exfat_blk_dev * bd,struct exfat_user_input * ui)42 static void exfat_setup_boot_sector(struct pbr *ppbr,
43 struct exfat_blk_dev *bd, struct exfat_user_input *ui)
44 {
45 struct bpb64 *pbpb = &ppbr->bpb;
46 struct bsx64 *pbsx = &ppbr->bsx;
47 unsigned int i;
48
49 /* Fill exfat BIOS parameter block */
50 pbpb->jmp_boot[0] = 0xeb;
51 pbpb->jmp_boot[1] = 0x76;
52 pbpb->jmp_boot[2] = 0x90;
53 memcpy(pbpb->oem_name, "EXFAT ", 8);
54 memset(pbpb->res_zero, 0, 53);
55
56 /* Fill exfat extend BIOS parameter block */
57 pbsx->vol_offset = cpu_to_le64(bd->offset / bd->sector_size);
58 pbsx->vol_length = cpu_to_le64(bd->size / bd->sector_size);
59 pbsx->fat_offset = cpu_to_le32(finfo.fat_byte_off / bd->sector_size);
60 pbsx->fat_length = cpu_to_le32(finfo.fat_byte_len / bd->sector_size);
61 pbsx->clu_offset = cpu_to_le32(finfo.clu_byte_off / bd->sector_size);
62 pbsx->clu_count = cpu_to_le32(finfo.total_clu_cnt);
63 pbsx->root_cluster = cpu_to_le32(finfo.root_start_clu);
64 pbsx->vol_serial = cpu_to_le32(finfo.volume_serial);
65 pbsx->vol_flags = 0;
66 pbsx->sect_size_bits = bd->sector_size_bits;
67 pbsx->sect_per_clus_bits = 0;
68 /* Compute base 2 logarithm of ui->cluster_size / bd->sector_size */
69 for (i = ui->cluster_size / bd->sector_size; i > 1; i /= 2)
70 pbsx->sect_per_clus_bits++;
71 pbsx->num_fats = 1;
72 /* fs_version[0] : minor and fs_version[1] : major */
73 pbsx->fs_version[0] = 0;
74 pbsx->fs_version[1] = 1;
75 pbsx->phy_drv_no = 0x80;
76 memset(pbsx->reserved2, 0, 7);
77
78 memset(ppbr->boot_code, 0, 390);
79 ppbr->signature = cpu_to_le16(PBR_SIGNATURE);
80
81 exfat_debug("Volume Offset(sectors) : %" PRIu64 "\n",
82 le64_to_cpu(pbsx->vol_offset));
83 exfat_debug("Volume Length(sectors) : %" PRIu64 "\n",
84 le64_to_cpu(pbsx->vol_length));
85 exfat_debug("FAT Offset(sector offset) : %u\n",
86 le32_to_cpu(pbsx->fat_offset));
87 exfat_debug("FAT Length(sectors) : %u\n",
88 le32_to_cpu(pbsx->fat_length));
89 exfat_debug("Cluster Heap Offset (sector offset) : %u\n",
90 le32_to_cpu(pbsx->clu_offset));
91 exfat_debug("Cluster Count : %u\n",
92 le32_to_cpu(pbsx->clu_count));
93 exfat_debug("Root Cluster (cluster offset) : %u\n",
94 le32_to_cpu(pbsx->root_cluster));
95 exfat_debug("Volume Serial : 0x%x\n", le32_to_cpu(pbsx->vol_serial));
96 exfat_debug("Sector Size Bits : %u\n",
97 pbsx->sect_size_bits);
98 exfat_debug("Sector per Cluster bits : %u\n",
99 pbsx->sect_per_clus_bits);
100 }
101
exfat_write_boot_sector(struct exfat_blk_dev * bd,struct exfat_user_input * ui,unsigned int * checksum,bool is_backup)102 static int exfat_write_boot_sector(struct exfat_blk_dev *bd,
103 struct exfat_user_input *ui, unsigned int *checksum,
104 bool is_backup)
105 {
106 struct pbr *ppbr;
107 unsigned int sec_idx = BOOT_SEC_IDX;
108 int ret = 0;
109
110 if (is_backup)
111 sec_idx += BACKUP_BOOT_SEC_IDX;
112
113 ppbr = malloc(bd->sector_size);
114 if (!ppbr) {
115 exfat_err("Cannot allocate pbr: out of memory\n");
116 return -1;
117 }
118 memset(ppbr, 0, bd->sector_size);
119
120 exfat_setup_boot_sector(ppbr, bd, ui);
121
122 /* write main boot sector */
123 ret = exfat_write_sector(bd, ppbr, sec_idx);
124 if (ret < 0) {
125 exfat_err("main boot sector write failed\n");
126 ret = -1;
127 goto free_ppbr;
128 }
129
130 boot_calc_checksum((unsigned char *)ppbr, bd->sector_size,
131 true, checksum);
132
133 free_ppbr:
134 free(ppbr);
135 return ret;
136 }
137
exfat_write_extended_boot_sectors(struct exfat_blk_dev * bd,unsigned int * checksum,bool is_backup)138 static int exfat_write_extended_boot_sectors(struct exfat_blk_dev *bd,
139 unsigned int *checksum, bool is_backup)
140 {
141 char *peb;
142 __le16 *peb_signature;
143 int ret = 0;
144 int i;
145 unsigned int sec_idx = EXBOOT_SEC_IDX;
146
147 peb = malloc(bd->sector_size);
148 if (!peb)
149 return -1;
150
151 if (is_backup)
152 sec_idx += BACKUP_BOOT_SEC_IDX;
153
154 memset(peb, 0, bd->sector_size);
155 peb_signature = (__le16*) (peb + bd->sector_size - 2);
156 *peb_signature = cpu_to_le16(PBR_SIGNATURE);
157 for (i = 0; i < EXBOOT_SEC_NUM; i++) {
158 if (exfat_write_sector(bd, peb, sec_idx++)) {
159 exfat_err("extended boot sector write failed\n");
160 ret = -1;
161 goto free_peb;
162 }
163
164 boot_calc_checksum((unsigned char *) peb, bd->sector_size,
165 false, checksum);
166 }
167
168 free_peb:
169 free(peb);
170 return ret;
171 }
172
exfat_write_oem_sector(struct exfat_blk_dev * bd,unsigned int * checksum,bool is_backup)173 static int exfat_write_oem_sector(struct exfat_blk_dev *bd,
174 unsigned int *checksum, bool is_backup)
175 {
176 char *oem;
177 int ret = 0;
178 unsigned int sec_idx = OEM_SEC_IDX;
179
180 oem = malloc(bd->sector_size);
181 if (!oem)
182 return -1;
183
184 if (is_backup)
185 sec_idx += BACKUP_BOOT_SEC_IDX;
186
187 memset(oem, 0xFF, bd->sector_size);
188 ret = exfat_write_sector(bd, oem, sec_idx);
189 if (ret) {
190 exfat_err("oem sector write failed\n");
191 ret = -1;
192 goto free_oem;
193 }
194
195 boot_calc_checksum((unsigned char *)oem, bd->sector_size, false,
196 checksum);
197
198 /* Zero out reserved sector */
199 memset(oem, 0, bd->sector_size);
200 ret = exfat_write_sector(bd, oem, sec_idx + 1);
201 if (ret) {
202 exfat_err("reserved sector write failed\n");
203 ret = -1;
204 goto free_oem;
205 }
206
207 boot_calc_checksum((unsigned char *)oem, bd->sector_size, false,
208 checksum);
209
210 free_oem:
211 free(oem);
212 return ret;
213 }
214
exfat_create_volume_boot_record(struct exfat_blk_dev * bd,struct exfat_user_input * ui,bool is_backup)215 static int exfat_create_volume_boot_record(struct exfat_blk_dev *bd,
216 struct exfat_user_input *ui, bool is_backup)
217 {
218 unsigned int checksum = 0;
219 int ret;
220
221 ret = exfat_write_boot_sector(bd, ui, &checksum, is_backup);
222 if (ret)
223 return ret;
224 ret = exfat_write_extended_boot_sectors(bd, &checksum, is_backup);
225 if (ret)
226 return ret;
227 ret = exfat_write_oem_sector(bd, &checksum, is_backup);
228 if (ret)
229 return ret;
230
231 return exfat_write_checksum_sector(bd, checksum, is_backup);
232 }
233
write_fat_entry(int fd,__le32 clu,unsigned long long offset)234 static int write_fat_entry(int fd, __le32 clu,
235 unsigned long long offset)
236 {
237 int nbyte;
238 off_t fat_entry_offset = finfo.fat_byte_off + (offset * sizeof(__le32));
239
240 nbyte = pwrite(fd, (__u8 *) &clu, sizeof(__le32), fat_entry_offset);
241 if (nbyte != sizeof(int)) {
242 exfat_err("write failed, offset : %llu, clu : %x\n",
243 offset, clu);
244 return -1;
245 }
246
247 return 0;
248 }
249
write_fat_entries(struct exfat_user_input * ui,int fd,unsigned int clu,unsigned int length)250 static int write_fat_entries(struct exfat_user_input *ui, int fd,
251 unsigned int clu, unsigned int length)
252 {
253 int ret;
254 unsigned int count;
255
256 count = clu + round_up(length, ui->cluster_size) / ui->cluster_size;
257
258 for (; clu < count - 1; clu++) {
259 ret = write_fat_entry(fd, cpu_to_le32(clu + 1), clu);
260 if (ret)
261 return ret;
262 }
263
264 ret = write_fat_entry(fd, cpu_to_le32(EXFAT_EOF_CLUSTER), clu);
265 if (ret)
266 return ret;
267
268 return clu;
269 }
270
exfat_create_fat_table(struct exfat_blk_dev * bd,struct exfat_user_input * ui)271 static int exfat_create_fat_table(struct exfat_blk_dev *bd,
272 struct exfat_user_input *ui)
273 {
274 int ret, clu;
275
276 /* fat entry 0 should be media type field(0xF8) */
277 ret = write_fat_entry(bd->dev_fd, cpu_to_le32(0xfffffff8), 0);
278 if (ret) {
279 exfat_err("fat 0 entry write failed\n");
280 return ret;
281 }
282
283 /* fat entry 1 is historical precedence(0xFFFFFFFF) */
284 ret = write_fat_entry(bd->dev_fd, cpu_to_le32(0xffffffff), 1);
285 if (ret) {
286 exfat_err("fat 1 entry write failed\n");
287 return ret;
288 }
289
290 /* write bitmap entries */
291 clu = write_fat_entries(ui, bd->dev_fd, EXFAT_FIRST_CLUSTER,
292 finfo.bitmap_byte_len);
293 if (clu < 0)
294 return ret;
295
296 /* write upcase table entries */
297 clu = write_fat_entries(ui, bd->dev_fd, clu + 1, finfo.ut_byte_len);
298 if (clu < 0)
299 return ret;
300
301 /* write root directory entries */
302 clu = write_fat_entries(ui, bd->dev_fd, clu + 1, finfo.root_byte_len);
303 if (clu < 0)
304 return ret;
305
306 finfo.used_clu_cnt = clu + 1;
307 exfat_debug("Total used cluster count : %d\n", finfo.used_clu_cnt);
308
309 return ret;
310 }
311
exfat_create_bitmap(struct exfat_blk_dev * bd)312 static int exfat_create_bitmap(struct exfat_blk_dev *bd)
313 {
314 char *bitmap;
315 unsigned int i, nbytes;
316
317 bitmap = calloc(finfo.bitmap_byte_len, sizeof(*bitmap));
318 if (!bitmap)
319 return -1;
320
321 for (i = 0; i < finfo.used_clu_cnt - EXFAT_FIRST_CLUSTER; i++)
322 exfat_set_bit(bd, bitmap, i);
323
324 nbytes = pwrite(bd->dev_fd, bitmap, finfo.bitmap_byte_len, finfo.bitmap_byte_off);
325 if (nbytes != finfo.bitmap_byte_len) {
326 exfat_err("write failed, nbytes : %d, bitmap_len : %d\n",
327 nbytes, finfo.bitmap_byte_len);
328 free(bitmap);
329 return -1;
330 }
331
332 free(bitmap);
333 return 0;
334 }
335
exfat_create_root_dir(struct exfat_blk_dev * bd,struct exfat_user_input * ui)336 static int exfat_create_root_dir(struct exfat_blk_dev *bd,
337 struct exfat_user_input *ui)
338 {
339 struct exfat_dentry ed[3];
340 int dentries_len = sizeof(struct exfat_dentry) * 3;
341 int nbytes;
342
343 /* Set volume label entry */
344 ed[0].type = EXFAT_VOLUME;
345 memset(ed[0].vol_label, 0, 22);
346 memcpy(ed[0].vol_label, ui->volume_label, ui->volume_label_len);
347 ed[0].vol_char_cnt = ui->volume_label_len/2;
348
349 /* Set bitmap entry */
350 ed[1].type = EXFAT_BITMAP;
351 ed[1].bitmap_flags = 0;
352 ed[1].bitmap_start_clu = cpu_to_le32(EXFAT_FIRST_CLUSTER);
353 ed[1].bitmap_size = cpu_to_le64(finfo.bitmap_byte_len);
354
355 /* Set upcase table entry */
356 ed[2].type = EXFAT_UPCASE;
357 ed[2].upcase_checksum = cpu_to_le32(0xe619d30d);
358 ed[2].upcase_start_clu = cpu_to_le32(finfo.ut_start_clu);
359 ed[2].upcase_size = cpu_to_le64(EXFAT_UPCASE_TABLE_SIZE);
360
361 nbytes = pwrite(bd->dev_fd, ed, dentries_len, finfo.root_byte_off);
362 if (nbytes != dentries_len) {
363 exfat_err("write failed, nbytes : %d, dentries_len : %d\n",
364 nbytes, dentries_len);
365 return -1;
366 }
367
368 return 0;
369 }
370
usage(void)371 static void usage(void)
372 {
373 fputs("Usage: mkfs.exfat\n"
374 "\t-L | --volume-label=label Set volume label\n"
375 "\t-c | --cluster-size=size(or suffixed by 'K' or 'M') Specify cluster size\n"
376 "\t-b | --boundary-align=size(or suffixed by 'K' or 'M') Specify boundary alignment\n"
377 "\t --pack-bitmap Move bitmap into FAT segment\n"
378 "\t-f | --full-format Full format\n"
379 "\t-V | --version Show version\n"
380 "\t-v | --verbose Print debug\n"
381 "\t-h | --help Show help\n",
382 stderr);
383
384 exit(EXIT_FAILURE);
385 }
386
387 #define PACK_BITMAP (CHAR_MAX + 1)
388
389 static const struct option opts[] = {
390 {"volume-label", required_argument, NULL, 'L' },
391 {"cluster-size", required_argument, NULL, 'c' },
392 {"boundary-align", required_argument, NULL, 'b' },
393 {"pack-bitmap", no_argument, NULL, PACK_BITMAP },
394 {"full-format", no_argument, NULL, 'f' },
395 {"version", no_argument, NULL, 'V' },
396 {"verbose", no_argument, NULL, 'v' },
397 {"help", no_argument, NULL, 'h' },
398 {"?", no_argument, NULL, '?' },
399 {NULL, 0, NULL, 0 }
400 };
401
402 /*
403 * Moves the bitmap to just before the alignment boundary if there is space
404 * between the boundary and the end of the FAT. This may allow the FAT and the
405 * bitmap to share the same allocation unit on flash media, thereby improving
406 * performance and endurance.
407 */
exfat_pack_bitmap(const struct exfat_user_input * ui)408 static int exfat_pack_bitmap(const struct exfat_user_input *ui)
409 {
410 unsigned int fat_byte_end = finfo.fat_byte_off + finfo.fat_byte_len,
411 bitmap_byte_len = finfo.bitmap_byte_len,
412 bitmap_clu_len = round_up(bitmap_byte_len, ui->cluster_size),
413 bitmap_clu_cnt, total_clu_cnt, new_bitmap_clu_len;
414
415 for (;;) {
416 bitmap_clu_cnt = bitmap_clu_len / ui->cluster_size;
417 if (finfo.clu_byte_off - bitmap_clu_len < fat_byte_end ||
418 finfo.total_clu_cnt > EXFAT_MAX_NUM_CLUSTER -
419 bitmap_clu_cnt)
420 return -1;
421 total_clu_cnt = finfo.total_clu_cnt + bitmap_clu_cnt;
422 bitmap_byte_len = round_up(total_clu_cnt, 8) / 8;
423 new_bitmap_clu_len = round_up(bitmap_byte_len, ui->cluster_size);
424 if (new_bitmap_clu_len == bitmap_clu_len) {
425 finfo.clu_byte_off -= bitmap_clu_len;
426 finfo.total_clu_cnt = total_clu_cnt;
427 finfo.bitmap_byte_off -= bitmap_clu_len;
428 finfo.bitmap_byte_len = bitmap_byte_len;
429 return 0;
430 }
431 bitmap_clu_len = new_bitmap_clu_len;
432 }
433 }
434
exfat_build_mkfs_info(struct exfat_blk_dev * bd,struct exfat_user_input * ui)435 static int exfat_build_mkfs_info(struct exfat_blk_dev *bd,
436 struct exfat_user_input *ui)
437 {
438 unsigned long long total_clu_cnt;
439 int clu_len;
440
441 if (ui->cluster_size < bd->sector_size) {
442 exfat_err("cluster size (%u bytes) is smaller than sector size (%u bytes)\n",
443 ui->cluster_size, bd->sector_size);
444 return -1;
445 }
446 if (ui->boundary_align < bd->sector_size) {
447 exfat_err("boundary alignment is too small (min %d)\n",
448 bd->sector_size);
449 return -1;
450 }
451 finfo.fat_byte_off = round_up(bd->offset + 24 * bd->sector_size,
452 ui->boundary_align) - bd->offset;
453 /* Prevent integer overflow when computing the FAT length */
454 if (bd->num_clusters > UINT32_MAX / 4) {
455 exfat_err("cluster size (%u bytes) is too small\n", ui->cluster_size);
456 return -1;
457 }
458 finfo.fat_byte_len = round_up((bd->num_clusters * 4), ui->cluster_size);
459 finfo.clu_byte_off = round_up(bd->offset + finfo.fat_byte_off +
460 finfo.fat_byte_len, ui->boundary_align) - bd->offset;
461 if (bd->size <= finfo.clu_byte_off) {
462 exfat_err("boundary alignment is too big\n");
463 return -1;
464 }
465 total_clu_cnt = (bd->size - finfo.clu_byte_off) / ui->cluster_size;
466 if (total_clu_cnt > EXFAT_MAX_NUM_CLUSTER) {
467 exfat_err("cluster size is too small\n");
468 return -1;
469 }
470 finfo.total_clu_cnt = (unsigned int) total_clu_cnt;
471
472 finfo.bitmap_byte_off = finfo.clu_byte_off;
473 finfo.bitmap_byte_len = round_up(finfo.total_clu_cnt, 8) / 8;
474 if (ui->pack_bitmap)
475 exfat_pack_bitmap(ui);
476 clu_len = round_up(finfo.bitmap_byte_len, ui->cluster_size);
477
478 finfo.ut_start_clu = EXFAT_FIRST_CLUSTER + clu_len / ui->cluster_size;
479 finfo.ut_byte_off = finfo.bitmap_byte_off + clu_len;
480 finfo.ut_byte_len = EXFAT_UPCASE_TABLE_SIZE;
481 clu_len = round_up(finfo.ut_byte_len, ui->cluster_size);
482
483 finfo.root_start_clu = finfo.ut_start_clu + clu_len / ui->cluster_size;
484 finfo.root_byte_off = finfo.ut_byte_off + clu_len;
485 finfo.root_byte_len = sizeof(struct exfat_dentry) * 3;
486 finfo.volume_serial = get_new_serial();
487
488 return 0;
489 }
490
exfat_zero_out_disk(struct exfat_blk_dev * bd,struct exfat_user_input * ui)491 static int exfat_zero_out_disk(struct exfat_blk_dev *bd,
492 struct exfat_user_input *ui)
493 {
494 int nbytes;
495 unsigned long long total_written = 0;
496 char *buf;
497 unsigned int chunk_size = ui->cluster_size;
498 unsigned long long size;
499
500 if (ui->quick)
501 size = finfo.root_byte_off + chunk_size;
502 else
503 size = bd->size;
504
505 buf = malloc(chunk_size);
506 if (!buf)
507 return -1;
508
509 memset(buf, 0, chunk_size);
510 lseek(bd->dev_fd, 0, SEEK_SET);
511 do {
512
513 nbytes = write(bd->dev_fd, buf, chunk_size);
514 if (nbytes <= 0) {
515 if (nbytes < 0)
516 exfat_err("write failed(errno : %d)\n", errno);
517 break;
518 }
519 total_written += nbytes;
520 } while (total_written < size);
521
522 free(buf);
523 exfat_debug("zero out written size : %llu, disk size : %llu\n",
524 total_written, bd->size);
525 return 0;
526 }
527
make_exfat(struct exfat_blk_dev * bd,struct exfat_user_input * ui)528 static int make_exfat(struct exfat_blk_dev *bd, struct exfat_user_input *ui)
529 {
530 int ret;
531
532 exfat_info("Creating exFAT filesystem(%s, cluster size=%u)\n\n",
533 ui->dev_name, ui->cluster_size);
534
535 exfat_info("Writing volume boot record: ");
536 ret = exfat_create_volume_boot_record(bd, ui, 0);
537 exfat_info("%s\n", ret ? "failed" : "done");
538 if (ret)
539 return ret;
540
541 exfat_info("Writing backup volume boot record: ");
542 /* backup sector */
543 ret = exfat_create_volume_boot_record(bd, ui, 1);
544 exfat_info("%s\n", ret ? "failed" : "done");
545 if (ret)
546 return ret;
547
548 exfat_info("Fat table creation: ");
549 ret = exfat_create_fat_table(bd, ui);
550 exfat_info("%s\n", ret ? "failed" : "done");
551 if (ret)
552 return ret;
553
554 exfat_info("Allocation bitmap creation: ");
555 ret = exfat_create_bitmap(bd);
556 exfat_info("%s\n", ret ? "failed" : "done");
557 if (ret)
558 return ret;
559
560 exfat_info("Upcase table creation: ");
561 ret = exfat_create_upcase_table(bd);
562 exfat_info("%s\n", ret ? "failed" : "done");
563 if (ret)
564 return ret;
565
566 exfat_info("Writing root directory entry: ");
567 ret = exfat_create_root_dir(bd, ui);
568 exfat_info("%s\n", ret ? "failed" : "done");
569 if (ret)
570 return ret;
571
572 return 0;
573 }
574
parse_size(const char * size)575 static long long parse_size(const char *size)
576 {
577 char *data_unit;
578 unsigned long long byte_size = strtoull(size, &data_unit, 0);
579
580 switch (*data_unit) {
581 case 'M':
582 case 'm':
583 byte_size <<= 20;
584 break;
585 case 'K':
586 case 'k':
587 byte_size <<= 10;
588 break;
589 case '\0':
590 break;
591 default:
592 exfat_err("Wrong unit input('%c') for size\n",
593 *data_unit);
594 return -EINVAL;
595 }
596
597 return byte_size;
598 }
599
main(int argc,char * argv[])600 int main(int argc, char *argv[])
601 {
602 int c;
603 int ret = EXIT_FAILURE;
604 struct exfat_blk_dev bd;
605 struct exfat_user_input ui;
606 bool version_only = false;
607
608 init_user_input(&ui);
609
610 if (!setlocale(LC_CTYPE, ""))
611 exfat_err("failed to init locale/codeset\n");
612
613 opterr = 0;
614 while ((c = getopt_long(argc, argv, "n:L:c:b:fVvh", opts, NULL)) != EOF)
615 switch (c) {
616 /*
617 * Make 'n' option fallthrough to 'L' option for for backward
618 * compatibility with old utils.
619 */
620 case 'n':
621 case 'L':
622 {
623 ret = exfat_utf16_enc(optarg,
624 ui.volume_label, sizeof(ui.volume_label));
625 if (ret < 0)
626 goto out;
627
628 ui.volume_label_len = ret;
629 break;
630 }
631 case 'c':
632 ret = parse_size(optarg);
633 if (ret < 0)
634 goto out;
635 else if (ret & (ret - 1)) {
636 exfat_err("cluster size(%d) is not a power of 2)\n",
637 ret);
638 goto out;
639 } else if (ret > EXFAT_MAX_CLUSTER_SIZE) {
640 exfat_err("cluster size(%d) exceeds max cluster size(%d)\n",
641 ui.cluster_size, EXFAT_MAX_CLUSTER_SIZE);
642 goto out;
643 }
644 ui.cluster_size = ret;
645 break;
646 case 'b':
647 ret = parse_size(optarg);
648 if (ret < 0)
649 goto out;
650 else if (ret & (ret - 1)) {
651 exfat_err("boundary align(%d) is not a power of 2)\n",
652 ret);
653 goto out;
654 }
655 ui.boundary_align = ret;
656 break;
657 case PACK_BITMAP:
658 ui.pack_bitmap = true;
659 break;
660 case 'f':
661 ui.quick = false;
662 break;
663 case 'V':
664 version_only = true;
665 break;
666 case 'v':
667 print_level = EXFAT_DEBUG;
668 break;
669 case '?':
670 case 'h':
671 default:
672 usage();
673 }
674
675 show_version();
676 if (version_only)
677 exit(EXIT_FAILURE);
678
679 if (argc - optind != 1) {
680 usage();
681 }
682
683 memset(ui.dev_name, 0, sizeof(ui.dev_name));
684 snprintf(ui.dev_name, sizeof(ui.dev_name), "%s", argv[optind]);
685
686 ret = exfat_get_blk_dev_info(&ui, &bd);
687 if (ret < 0)
688 goto out;
689
690 ret = exfat_build_mkfs_info(&bd, &ui);
691 if (ret)
692 goto close;
693
694 ret = exfat_zero_out_disk(&bd, &ui);
695 if (ret)
696 goto close;
697
698 ret = make_exfat(&bd, &ui);
699 if (ret)
700 goto close;
701
702 exfat_info("Synchronizing...\n");
703 ret = fsync(bd.dev_fd);
704 close:
705 close(bd.dev_fd);
706 out:
707 if (!ret)
708 exfat_info("\nexFAT format complete!\n");
709 else
710 exfat_info("\nexFAT format fail!\n");
711 return ret;
712 }
713