blob: 7d81ed06d8326940cdd2d2da519a04ecad215909
1 | /* vi: set sw=4 ts=4: */ |
2 | /* |
3 | * mkfs_vfat: utility to create FAT32 filesystem |
4 | * inspired by dosfstools |
5 | * |
6 | * Busybox'ed (2009) by Vladimir Dronnikov <dronnikov@gmail.com> |
7 | * |
8 | * Licensed under GPLv2, see file LICENSE in this source tree. |
9 | */ |
10 | |
11 | //usage:#define mkfs_vfat_trivial_usage |
12 | //usage: "[-v] [-n LABEL] BLOCKDEV [KBYTES]" |
13 | /* Accepted but ignored: |
14 | "[-c] [-C] [-I] [-l bad-block-file] [-b backup-boot-sector] " |
15 | "[-m boot-msg-file] [-i volume-id] " |
16 | "[-s sectors-per-cluster] [-S logical-sector-size] [-f number-of-FATs] " |
17 | "[-h hidden-sectors] [-F fat-size] [-r root-dir-entries] [-R reserved-sectors] " |
18 | */ |
19 | //usage:#define mkfs_vfat_full_usage "\n\n" |
20 | //usage: "Make a FAT32 filesystem\n" |
21 | /* //usage: "\n -c Check device for bad blocks" */ |
22 | //usage: "\n -v Verbose" |
23 | /* //usage: "\n -I Allow to use entire disk device (e.g. /dev/hda)" */ |
24 | //usage: "\n -n LBL Volume label" |
25 | |
26 | #include "libbb.h" |
27 | |
28 | #include <linux/hdreg.h> /* HDIO_GETGEO */ |
29 | #include <linux/fd.h> /* FDGETPRM */ |
30 | #include <sys/mount.h> /* BLKSSZGET */ |
31 | #if !defined(BLKSSZGET) |
32 | # define BLKSSZGET _IO(0x12, 104) |
33 | #endif |
34 | //#include <linux/msdos_fs.h> |
35 | |
36 | #define SECTOR_SIZE 512 |
37 | |
38 | #define SECTORS_PER_BLOCK (BLOCK_SIZE / SECTOR_SIZE) |
39 | |
40 | // M$ says the high 4 bits of a FAT32 FAT entry are reserved |
41 | #define EOF_FAT32 0x0FFFFFF8 |
42 | #define BAD_FAT32 0x0FFFFFF7 |
43 | #define MAX_CLUST_32 0x0FFFFFF0 |
44 | |
45 | #define ATTR_VOLUME 8 |
46 | |
47 | #define NUM_FATS 2 |
48 | |
49 | /* FAT32 filesystem looks like this: |
50 | * sector -nn...-1: "hidden" sectors, all sectors before this partition |
51 | * (-h hidden-sectors sets it. Useful only for boot loaders, |
52 | * they need to know _disk_ offset in order to be able to correctly |
53 | * address sectors relative to start of disk) |
54 | * sector 0: boot sector |
55 | * sector 1: info sector |
56 | * sector 2: set aside for boot code which didn't fit into sector 0 |
57 | * ...(zero-filled sectors)... |
58 | * sector B: backup copy of sector 0 [B set by -b backup-boot-sector] |
59 | * sector B+1: backup copy of sector 1 |
60 | * sector B+2: backup copy of sector 2 |
61 | * ...(zero-filled sectors)... |
62 | * sector R: FAT#1 [R set by -R reserved-sectors] |
63 | * ...(FAT#1)... |
64 | * sector R+fat_size: FAT#2 |
65 | * ...(FAT#2)... |
66 | * sector R+fat_size*2: cluster #2 |
67 | * ...(cluster #2)... |
68 | * sector R+fat_size*2+clust_size: cluster #3 |
69 | * ...(the rest is filled by clusters till the end)... |
70 | */ |
71 | |
72 | enum { |
73 | // Perhaps this should remain constant |
74 | info_sector_number = 1, |
75 | // TODO: make these cmdline options |
76 | // dont forget sanity check: backup_boot_sector + 3 <= reserved_sect |
77 | backup_boot_sector = 3, |
78 | reserved_sect = 6, |
79 | }; |
80 | |
81 | // how many blocks we try to read while testing |
82 | #define TEST_BUFFER_BLOCKS 16 |
83 | |
84 | struct msdos_dir_entry { |
85 | char name[11]; /* 000 name and extension */ |
86 | uint8_t attr; /* 00b attribute bits */ |
87 | uint8_t lcase; /* 00c case for base and extension */ |
88 | uint8_t ctime_cs; /* 00d creation time, centiseconds (0-199) */ |
89 | uint16_t ctime; /* 00e creation time */ |
90 | uint16_t cdate; /* 010 creation date */ |
91 | uint16_t adate; /* 012 last access date */ |
92 | uint16_t starthi; /* 014 high 16 bits of cluster in FAT32 */ |
93 | uint16_t time; /* 016 time */ |
94 | uint16_t date; /* 018 date */ |
95 | uint16_t start; /* 01a first cluster */ |
96 | uint32_t size; /* 01c file size in bytes */ |
97 | } PACKED; |
98 | |
99 | /* Example of boot sector's beginning: |
100 | 0000 eb 58 90 4d 53 57 49 4e 34 2e 31 00 02 08 26 00 |...MSWIN4.1...&.| |
101 | 0010 02 00 00 00 00 f8 00 00 3f 00 ff 00 3f 00 00 00 |........?...?...| |
102 | 0020 54 9b d0 00 0d 34 00 00 00 00 00 00 02 00 00 00 |T....4..........| |
103 | 0030 01 00 06 00 00 00 00 00 00 00 00 00 00 00 00 00 |................| |
104 | 0040 80 00 29 71 df 51 e0 4e 4f 20 4e 41 4d 45 20 20 |..)q.Q.NO NAME | |
105 | 0050 20 20 46 41 54 33 32 20 20 20 33 c9 8e d1 bc f4 | FAT32 3.....| |
106 | */ |
107 | struct msdos_volume_info { /* (offsets are relative to start of boot sector) */ |
108 | uint8_t drive_number; /* 040 BIOS drive number */ |
109 | uint8_t reserved; /* 041 unused */ |
110 | uint8_t ext_boot_sign; /* 042 0x29 if fields below exist (DOS 3.3+) */ |
111 | uint32_t volume_id32; /* 043 volume ID number */ |
112 | char volume_label[11];/* 047 volume label */ |
113 | char fs_type[8]; /* 052 typically "FATnn" */ |
114 | } PACKED; /* 05a end. Total size 26 (0x1a) bytes */ |
115 | |
116 | struct msdos_boot_sector { |
117 | /* We use strcpy to fill both, and gcc-4.4.x complains if they are separate */ |
118 | char boot_jump_and_sys_id[3+8]; /* 000 short or near jump instruction */ |
119 | /*char system_id[8];*/ /* 003 name - can be used to special case partition manager volumes */ |
120 | uint16_t bytes_per_sect; /* 00b bytes per logical sector */ |
121 | uint8_t sect_per_clust; /* 00d sectors/cluster */ |
122 | uint16_t reserved_sect; /* 00e reserved sectors (sector offset of 1st FAT relative to volume start) */ |
123 | uint8_t fats; /* 010 number of FATs */ |
124 | uint16_t dir_entries; /* 011 root directory entries */ |
125 | uint16_t volume_size_sect; /* 013 volume size in sectors */ |
126 | uint8_t media_byte; /* 015 media code */ |
127 | uint16_t sect_per_fat; /* 016 sectors/FAT */ |
128 | uint16_t sect_per_track; /* 018 sectors per track */ |
129 | uint16_t heads; /* 01a number of heads */ |
130 | uint32_t hidden; /* 01c hidden sectors (sector offset of volume within physical disk) */ |
131 | uint32_t fat32_volume_size_sect; /* 020 volume size in sectors (if volume_size_sect == 0) */ |
132 | uint32_t fat32_sect_per_fat; /* 024 sectors/FAT */ |
133 | uint16_t fat32_flags; /* 028 bit 8: fat mirroring, low 4: active fat */ |
134 | uint8_t fat32_version[2]; /* 02a major, minor filesystem version (I see 0,0) */ |
135 | uint32_t fat32_root_cluster; /* 02c first cluster in root directory */ |
136 | uint16_t fat32_info_sector; /* 030 filesystem info sector (usually 1) */ |
137 | uint16_t fat32_backup_boot; /* 032 backup boot sector (usually 6) */ |
138 | uint32_t reserved2[3]; /* 034 unused */ |
139 | struct msdos_volume_info vi; /* 040 */ |
140 | char boot_code[0x200 - 0x5a - 2]; /* 05a */ |
141 | #define BOOT_SIGN 0xAA55 |
142 | uint16_t boot_sign; /* 1fe */ |
143 | } PACKED; |
144 | |
145 | #define FAT_FSINFO_SIG1 0x41615252 |
146 | #define FAT_FSINFO_SIG2 0x61417272 |
147 | struct fat32_fsinfo { |
148 | uint32_t signature1; /* 0x52,0x52,0x41,0x61, "RRaA" */ |
149 | uint32_t reserved1[128 - 8]; |
150 | uint32_t signature2; /* 0x72,0x72,0x61,0x41, "rrAa" */ |
151 | uint32_t free_clusters; /* free cluster count. -1 if unknown */ |
152 | uint32_t next_cluster; /* most recently allocated cluster */ |
153 | uint32_t reserved2[3]; |
154 | uint16_t reserved3; /* 1fc */ |
155 | uint16_t boot_sign; /* 1fe */ |
156 | } PACKED; |
157 | |
158 | struct bug_check { |
159 | char BUG1[sizeof(struct msdos_dir_entry ) == 0x20 ? 1 : -1]; |
160 | char BUG2[sizeof(struct msdos_volume_info) == 0x1a ? 1 : -1]; |
161 | char BUG3[sizeof(struct msdos_boot_sector) == 0x200 ? 1 : -1]; |
162 | char BUG4[sizeof(struct fat32_fsinfo ) == 0x200 ? 1 : -1]; |
163 | }; |
164 | |
165 | static const char boot_code[] ALIGN1 = |
166 | "\x0e" /* 05a: push cs */ |
167 | "\x1f" /* 05b: pop ds */ |
168 | "\xbe\x77\x7c" /* write_msg: mov si, offset message_txt */ |
169 | "\xac" /* 05f: lodsb */ |
170 | "\x22\xc0" /* 060: and al, al */ |
171 | "\x74\x0b" /* 062: jz key_press */ |
172 | "\x56" /* 064: push si */ |
173 | "\xb4\x0e" /* 065: mov ah, 0eh */ |
174 | "\xbb\x07\x00" /* 067: mov bx, 0007h */ |
175 | "\xcd\x10" /* 06a: int 10h */ |
176 | "\x5e" /* 06c: pop si */ |
177 | "\xeb\xf0" /* 06d: jmp write_msg */ |
178 | "\x32\xe4" /* key_press: xor ah, ah */ |
179 | "\xcd\x16" /* 071: int 16h */ |
180 | "\xcd\x19" /* 073: int 19h */ |
181 | "\xeb\xfe" /* foo: jmp foo */ |
182 | /* 077: message_txt: */ |
183 | "This is not a bootable disk\r\n"; |
184 | |
185 | |
186 | #define MARK_CLUSTER(cluster, value) \ |
187 | ((uint32_t *)fat)[cluster] = SWAP_LE32(value) |
188 | |
189 | void BUG_unsupported_field_size(void); |
190 | #define STORE_LE(field, value) \ |
191 | do { \ |
192 | if (sizeof(field) == 4) \ |
193 | field = SWAP_LE32(value); \ |
194 | else if (sizeof(field) == 2) \ |
195 | field = SWAP_LE16(value); \ |
196 | else if (sizeof(field) == 1) \ |
197 | field = (value); \ |
198 | else \ |
199 | BUG_unsupported_field_size(); \ |
200 | } while (0) |
201 | |
202 | /* compat: |
203 | * mkdosfs 2.11 (12 Mar 2005) |
204 | * Usage: mkdosfs [-A] [-c] [-C] [-v] [-I] [-l bad-block-file] |
205 | * [-b backup-boot-sector] |
206 | * [-m boot-msg-file] [-n volume-name] [-i volume-id] |
207 | * [-s sectors-per-cluster] [-S logical-sector-size] |
208 | * [-f number-of-FATs] |
209 | * [-h hidden-sectors] [-F fat-size] [-r root-dir-entries] |
210 | * [-R reserved-sectors] |
211 | * /dev/name [blocks] |
212 | */ |
213 | int mkfs_vfat_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
214 | int mkfs_vfat_main(int argc UNUSED_PARAM, char **argv) |
215 | { |
216 | struct stat st; |
217 | const char *volume_label = ""; |
218 | char *buf; |
219 | char *device_name; |
220 | uoff_t volume_size_bytes; |
221 | uoff_t volume_size_sect; |
222 | uint32_t total_clust; |
223 | uint32_t volume_id; |
224 | int dev; |
225 | unsigned bytes_per_sect; |
226 | unsigned sect_per_fat; |
227 | unsigned opts; |
228 | uint16_t sect_per_track; |
229 | uint8_t media_byte; |
230 | uint8_t sect_per_clust; |
231 | uint8_t heads; |
232 | enum { |
233 | OPT_A = 1 << 0, // [IGNORED] atari format |
234 | OPT_b = 1 << 1, // [IGNORED] location of backup boot sector |
235 | OPT_c = 1 << 2, // [IGNORED] check filesystem |
236 | OPT_C = 1 << 3, // [IGNORED] create a new file |
237 | OPT_f = 1 << 4, // [IGNORED] number of FATs |
238 | OPT_F = 1 << 5, // [IGNORED, implied 32] choose FAT size |
239 | OPT_h = 1 << 6, // [IGNORED] number of hidden sectors |
240 | OPT_I = 1 << 7, // [IGNORED] don't bark at entire disk devices |
241 | OPT_i = 1 << 8, // [IGNORED] volume ID |
242 | OPT_l = 1 << 9, // [IGNORED] bad block filename |
243 | OPT_m = 1 << 10, // [IGNORED] message file |
244 | OPT_n = 1 << 11, // volume label |
245 | OPT_r = 1 << 12, // [IGNORED] root directory entries |
246 | OPT_R = 1 << 13, // [IGNORED] number of reserved sectors |
247 | OPT_s = 1 << 14, // [IGNORED] sectors per cluster |
248 | OPT_S = 1 << 15, // [IGNORED] sector size |
249 | OPT_v = 1 << 16, // verbose |
250 | }; |
251 | |
252 | opt_complementary = "-1";//:b+:f+:F+:h+:r+:R+:s+:S+:vv:c--l:l--c"; |
253 | opts = getopt32(argv, "Ab:cCf:F:h:Ii:l:m:n:r:R:s:S:v", |
254 | NULL, NULL, NULL, NULL, NULL, |
255 | NULL, NULL, &volume_label, NULL, NULL, NULL, NULL); |
256 | argv += optind; |
257 | |
258 | // cache device name |
259 | device_name = argv[0]; |
260 | // default volume ID = creation time |
261 | volume_id = time(NULL); |
262 | |
263 | dev = xopen(device_name, O_RDWR); |
264 | xfstat(dev, &st, device_name); |
265 | |
266 | // |
267 | // Get image size and sector size |
268 | // |
269 | bytes_per_sect = SECTOR_SIZE; |
270 | if (!S_ISBLK(st.st_mode)) { |
271 | if (!S_ISREG(st.st_mode)) { |
272 | if (!argv[1]) |
273 | bb_error_msg_and_die("image size must be specified"); |
274 | } |
275 | // not a block device, skip bad sectors check |
276 | opts &= ~OPT_c; |
277 | } else { |
278 | int min_bytes_per_sect; |
279 | #if 0 |
280 | unsigned device_num; |
281 | // for true block devices we do check sanity |
282 | device_num = st.st_rdev & 0xff3f; |
283 | // do we allow to format the whole disk device? |
284 | if (!(opts & OPT_I) && ( |
285 | device_num == 0x0300 || // hda, hdb |
286 | (device_num & 0xff0f) == 0x0800 || // sd |
287 | device_num == 0x0d00 || // xd |
288 | device_num == 0x1600 ) // hdc, hdd |
289 | ) |
290 | bb_error_msg_and_die("will not try to make filesystem on full-disk device (use -I if wanted)"); |
291 | // can't work on mounted filesystems |
292 | if (find_mount_point(device_name, 0)) |
293 | bb_error_msg_and_die("can't format mounted filesystem"); |
294 | #endif |
295 | // get true sector size |
296 | // (parameter must be int*, not long* or size_t*) |
297 | xioctl(dev, BLKSSZGET, &min_bytes_per_sect); |
298 | if (min_bytes_per_sect > SECTOR_SIZE) { |
299 | bytes_per_sect = min_bytes_per_sect; |
300 | bb_error_msg("for this device sector size is %u", min_bytes_per_sect); |
301 | } |
302 | } |
303 | volume_size_bytes = get_volume_size_in_bytes(dev, argv[1], 1024, /*extend:*/ 1); |
304 | volume_size_sect = volume_size_bytes / bytes_per_sect; |
305 | |
306 | // |
307 | // Find out or guess media parameters |
308 | // |
309 | media_byte = 0xf8; |
310 | heads = 255; |
311 | sect_per_track = 63; |
312 | sect_per_clust = 1; |
313 | { |
314 | struct hd_geometry geometry; |
315 | // size (in sectors), sect (per track), head |
316 | struct floppy_struct param; |
317 | |
318 | // N.B. whether to use HDIO_GETGEO or HDIO_REQ? |
319 | if (ioctl(dev, HDIO_GETGEO, &geometry) == 0 |
320 | && geometry.sectors |
321 | && geometry.heads |
322 | ) { |
323 | // hard drive |
324 | sect_per_track = geometry.sectors; |
325 | heads = geometry.heads; |
326 | |
327 | set_cluster_size: |
328 | /* For FAT32, try to do the same as M$'s format command |
329 | * (see http://www.win.tue.nl/~aeb/linux/fs/fat/fatgen103.pdf p. 20): |
330 | * fs size <= 260M: 0.5k clusters |
331 | * fs size <= 8G: 4k clusters |
332 | * fs size <= 16G: 8k clusters |
333 | * fs size > 16G: 16k clusters |
334 | */ |
335 | sect_per_clust = 1; |
336 | if (volume_size_bytes >= 260*1024*1024) { |
337 | sect_per_clust = 8; |
338 | /* fight gcc: */ |
339 | /* "error: integer overflow in expression" */ |
340 | /* "error: right shift count >= width of type" */ |
341 | if (sizeof(off_t) > 4) { |
342 | unsigned t = (volume_size_bytes >> 31 >> 1); |
343 | if (t >= 8/4) |
344 | sect_per_clust = 16; |
345 | if (t >= 16/4) |
346 | sect_per_clust = 32; |
347 | } |
348 | } |
349 | } else { |
350 | // floppy, loop, or regular file |
351 | int not_floppy = ioctl(dev, FDGETPRM, ¶m); |
352 | if (not_floppy == 0) { |
353 | // floppy disk |
354 | sect_per_track = param.sect; |
355 | heads = param.head; |
356 | volume_size_sect = param.size; |
357 | volume_size_bytes = param.size * SECTOR_SIZE; |
358 | } |
359 | // setup the media descriptor byte |
360 | switch (volume_size_sect) { |
361 | case 2*360: // 5.25", 2, 9, 40 - 360K |
362 | media_byte = 0xfd; |
363 | break; |
364 | case 2*720: // 3.5", 2, 9, 80 - 720K |
365 | case 2*1200: // 5.25", 2, 15, 80 - 1200K |
366 | media_byte = 0xf9; |
367 | break; |
368 | default: // anything else |
369 | if (not_floppy) |
370 | goto set_cluster_size; |
371 | case 2*1440: // 3.5", 2, 18, 80 - 1440K |
372 | case 2*2880: // 3.5", 2, 36, 80 - 2880K |
373 | media_byte = 0xf0; |
374 | break; |
375 | } |
376 | // not floppy, but size matches floppy exactly. |
377 | // perhaps it is a floppy image. |
378 | // we already set media_byte as if it is a floppy, |
379 | // now set sect_per_track and heads. |
380 | heads = 2; |
381 | sect_per_track = (unsigned)volume_size_sect / 160; |
382 | if (sect_per_track < 9) |
383 | sect_per_track = 9; |
384 | } |
385 | } |
386 | |
387 | // |
388 | // Calculate number of clusters, sectors/cluster, sectors/FAT |
389 | // (an initial guess for sect_per_clust should already be set) |
390 | // |
391 | // "mkdosfs -v -F 32 image5k 5" is the minimum: |
392 | // 2 sectors for FATs and 2 data sectors |
393 | if ((off_t)(volume_size_sect - reserved_sect) < 4) |
394 | bb_error_msg_and_die("the image is too small for FAT32"); |
395 | sect_per_fat = 1; |
396 | while (1) { |
397 | while (1) { |
398 | int spf_adj; |
399 | uoff_t tcl = (volume_size_sect - reserved_sect - NUM_FATS * sect_per_fat) / sect_per_clust; |
400 | // tcl may be > MAX_CLUST_32 here, but it may be |
401 | // because sect_per_fat is underestimated, |
402 | // and with increased sect_per_fat it still may become |
403 | // <= MAX_CLUST_32. Therefore, we do not check |
404 | // against MAX_CLUST_32, but against a bigger const: |
405 | if (tcl > 0x80ffffff) |
406 | goto next; |
407 | total_clust = tcl; // fits in uint32_t |
408 | // Every cluster needs 4 bytes in FAT. +2 entries since |
409 | // FAT has space for non-existent clusters 0 and 1. |
410 | // Let's see how many sectors that needs. |
411 | //May overflow at "*4": |
412 | //spf_adj = ((total_clust+2) * 4 + bytes_per_sect-1) / bytes_per_sect - sect_per_fat; |
413 | //Same in the more obscure, non-overflowing form: |
414 | spf_adj = ((total_clust+2) + (bytes_per_sect/4)-1) / (bytes_per_sect/4) - sect_per_fat; |
415 | #if 0 |
416 | bb_error_msg("sect_per_clust:%u sect_per_fat:%u total_clust:%u", |
417 | sect_per_clust, sect_per_fat, (int)tcl); |
418 | bb_error_msg("adjust to sect_per_fat:%d", spf_adj); |
419 | #endif |
420 | if (spf_adj <= 0) { |
421 | // do not need to adjust sect_per_fat. |
422 | // so, was total_clust too big after all? |
423 | if (total_clust <= MAX_CLUST_32) |
424 | goto found_total_clust; // no |
425 | // yes, total_clust is _a bit_ too big |
426 | goto next; |
427 | } |
428 | // adjust sect_per_fat, go back and recalc total_clust |
429 | // (note: just "sect_per_fat += spf_adj" isn't ok) |
430 | sect_per_fat += ((unsigned)spf_adj / 2) | 1; |
431 | } |
432 | next: |
433 | if (sect_per_clust == 128) |
434 | bb_error_msg_and_die("can't make FAT32 with >128 sectors/cluster"); |
435 | sect_per_clust *= 2; |
436 | sect_per_fat = (sect_per_fat / 2) | 1; |
437 | } |
438 | found_total_clust: |
439 | |
440 | // |
441 | // Print info |
442 | // |
443 | if (opts & OPT_v) { |
444 | fprintf(stderr, |
445 | "Device '%s':\n" |
446 | "heads:%u, sectors/track:%u, bytes/sector:%u\n" |
447 | "media descriptor:%02x\n" |
448 | "total sectors:%"OFF_FMT"u, clusters:%u, sectors/cluster:%u\n" |
449 | "FATs:2, sectors/FAT:%u\n" |
450 | "volumeID:%08x, label:'%s'\n", |
451 | device_name, |
452 | heads, sect_per_track, bytes_per_sect, |
453 | (int)media_byte, |
454 | volume_size_sect, (int)total_clust, (int)sect_per_clust, |
455 | sect_per_fat, |
456 | (int)volume_id, volume_label |
457 | ); |
458 | } |
459 | |
460 | // |
461 | // Write filesystem image sequentially (no seeking) |
462 | // |
463 | { |
464 | // (a | b) is poor man's max(a, b) |
465 | unsigned bufsize = reserved_sect; |
466 | //bufsize |= sect_per_fat; // can be quite large |
467 | bufsize |= 2; // use this instead |
468 | bufsize |= sect_per_clust; |
469 | buf = xzalloc(bufsize * bytes_per_sect); |
470 | } |
471 | |
472 | { // boot and fsinfo sectors, and their copies |
473 | struct msdos_boot_sector *boot_blk = (void*)buf; |
474 | struct fat32_fsinfo *info = (void*)(buf + bytes_per_sect); |
475 | |
476 | strcpy(boot_blk->boot_jump_and_sys_id, "\xeb\x58\x90" "mkdosfs"); |
477 | STORE_LE(boot_blk->bytes_per_sect, bytes_per_sect); |
478 | STORE_LE(boot_blk->sect_per_clust, sect_per_clust); |
479 | // cast in needed on big endian to suppress a warning |
480 | STORE_LE(boot_blk->reserved_sect, (uint16_t)reserved_sect); |
481 | STORE_LE(boot_blk->fats, 2); |
482 | //STORE_LE(boot_blk->dir_entries, 0); // for FAT32, stays 0 |
483 | if (volume_size_sect <= 0xffff) |
484 | STORE_LE(boot_blk->volume_size_sect, volume_size_sect); |
485 | STORE_LE(boot_blk->media_byte, media_byte); |
486 | // wrong: this would make Linux think that it's fat12/16: |
487 | //if (sect_per_fat <= 0xffff) |
488 | // STORE_LE(boot_blk->sect_per_fat, sect_per_fat); |
489 | // works: |
490 | //STORE_LE(boot_blk->sect_per_fat, 0); |
491 | STORE_LE(boot_blk->sect_per_track, sect_per_track); |
492 | STORE_LE(boot_blk->heads, heads); |
493 | //STORE_LE(boot_blk->hidden, 0); |
494 | STORE_LE(boot_blk->fat32_volume_size_sect, volume_size_sect); |
495 | STORE_LE(boot_blk->fat32_sect_per_fat, sect_per_fat); |
496 | //STORE_LE(boot_blk->fat32_flags, 0); |
497 | //STORE_LE(boot_blk->fat32_version[2], 0,0); |
498 | STORE_LE(boot_blk->fat32_root_cluster, 2); |
499 | STORE_LE(boot_blk->fat32_info_sector, info_sector_number); |
500 | STORE_LE(boot_blk->fat32_backup_boot, backup_boot_sector); |
501 | //STORE_LE(boot_blk->reserved2[3], 0,0,0); |
502 | STORE_LE(boot_blk->vi.ext_boot_sign, 0x29); |
503 | STORE_LE(boot_blk->vi.volume_id32, volume_id); |
504 | strncpy(boot_blk->vi.fs_type, "FAT32 ", sizeof(boot_blk->vi.fs_type)); |
505 | strncpy(boot_blk->vi.volume_label, volume_label, sizeof(boot_blk->vi.volume_label)); |
506 | memcpy(boot_blk->boot_code, boot_code, sizeof(boot_code)); |
507 | STORE_LE(boot_blk->boot_sign, BOOT_SIGN); |
508 | |
509 | STORE_LE(info->signature1, FAT_FSINFO_SIG1); |
510 | STORE_LE(info->signature2, FAT_FSINFO_SIG2); |
511 | // we've allocated cluster 2 for the root dir |
512 | STORE_LE(info->free_clusters, (total_clust - 1)); |
513 | STORE_LE(info->next_cluster, 2); |
514 | STORE_LE(info->boot_sign, BOOT_SIGN); |
515 | |
516 | // 1st copy |
517 | xwrite(dev, buf, bytes_per_sect * backup_boot_sector); |
518 | // 2nd copy and possibly zero sectors |
519 | xwrite(dev, buf, bytes_per_sect * (reserved_sect - backup_boot_sector)); |
520 | } |
521 | |
522 | { // file allocation tables |
523 | unsigned i,j; |
524 | unsigned char *fat = (void*)buf; |
525 | |
526 | memset(buf, 0, bytes_per_sect * 2); |
527 | // initial FAT entries |
528 | MARK_CLUSTER(0, 0x0fffff00 | media_byte); |
529 | MARK_CLUSTER(1, 0xffffffff); |
530 | // mark cluster 2 as EOF (used for root dir) |
531 | MARK_CLUSTER(2, EOF_FAT32); |
532 | for (i = 0; i < NUM_FATS; i++) { |
533 | xwrite(dev, buf, bytes_per_sect); |
534 | for (j = 1; j < sect_per_fat; j++) |
535 | xwrite(dev, buf + bytes_per_sect, bytes_per_sect); |
536 | } |
537 | } |
538 | |
539 | // root directory |
540 | // empty directory is just a set of zero bytes |
541 | memset(buf, 0, sect_per_clust * bytes_per_sect); |
542 | if (volume_label[0]) { |
543 | // create dir entry for volume_label |
544 | struct msdos_dir_entry *de; |
545 | #if 0 |
546 | struct tm tm_time; |
547 | uint16_t t, d; |
548 | #endif |
549 | de = (void*)buf; |
550 | strncpy(de->name, volume_label, sizeof(de->name)); |
551 | STORE_LE(de->attr, ATTR_VOLUME); |
552 | #if 0 |
553 | localtime_r(&create_time, &tm_time); |
554 | t = (tm_time.tm_sec >> 1) + (tm_time.tm_min << 5) + (tm_time.tm_hour << 11); |
555 | d = tm_time.tm_mday + ((tm_time.tm_mon+1) << 5) + ((tm_time.tm_year-80) << 9); |
556 | STORE_LE(de->time, t); |
557 | STORE_LE(de->date, d); |
558 | //STORE_LE(de->ctime_cs, 0); |
559 | de->ctime = de->time; |
560 | de->cdate = de->date; |
561 | de->adate = de->date; |
562 | #endif |
563 | } |
564 | xwrite(dev, buf, sect_per_clust * bytes_per_sect); |
565 | |
566 | #if 0 |
567 | if (opts & OPT_c) { |
568 | uoff_t volume_size_blocks; |
569 | unsigned start_data_sector; |
570 | unsigned start_data_block; |
571 | unsigned badblocks = 0; |
572 | int try, got; |
573 | off_t currently_testing; |
574 | char *blkbuf = xmalloc(BLOCK_SIZE * TEST_BUFFER_BLOCKS); |
575 | |
576 | volume_size_blocks = (volume_size_bytes >> BLOCK_SIZE_BITS); |
577 | // N.B. the two following vars are in hard sectors, i.e. SECTOR_SIZE byte sectors! |
578 | start_data_sector = (reserved_sect + NUM_FATS * sect_per_fat) * (bytes_per_sect / SECTOR_SIZE); |
579 | start_data_block = (start_data_sector + SECTORS_PER_BLOCK - 1) / SECTORS_PER_BLOCK; |
580 | |
581 | bb_info_msg("searching for bad blocks "); |
582 | currently_testing = 0; |
583 | try = TEST_BUFFER_BLOCKS; |
584 | while (currently_testing < volume_size_blocks) { |
585 | if (currently_testing + try > volume_size_blocks) |
586 | try = volume_size_blocks - currently_testing; |
587 | // perform a test on a block. return the number of blocks |
588 | // that could be read successfully. |
589 | // seek to the correct location |
590 | xlseek(dev, currently_testing * BLOCK_SIZE, SEEK_SET); |
591 | // try reading |
592 | got = read(dev, blkbuf, try * BLOCK_SIZE); |
593 | if (got < 0) |
594 | got = 0; |
595 | if (got & (BLOCK_SIZE - 1)) |
596 | bb_error_msg("unexpected values in do_check: probably bugs"); |
597 | got /= BLOCK_SIZE; |
598 | currently_testing += got; |
599 | if (got == try) { |
600 | try = TEST_BUFFER_BLOCKS; |
601 | continue; |
602 | } |
603 | try = 1; |
604 | if (currently_testing < start_data_block) |
605 | bb_error_msg_and_die("bad blocks before data-area: cannot make fs"); |
606 | |
607 | // mark all of the sectors in the block as bad |
608 | for (i = 0; i < SECTORS_PER_BLOCK; i++) { |
609 | int cluster = (currently_testing * SECTORS_PER_BLOCK + i - start_data_sector) / (int) (sect_per_clust) / (bytes_per_sect / SECTOR_SIZE); |
610 | if (cluster < 0) |
611 | bb_error_msg_and_die("invalid cluster number in mark_sector: probably bug!"); |
612 | MARK_CLUSTER(cluster, BAD_FAT32); |
613 | } |
614 | badblocks++; |
615 | currently_testing++; |
616 | } |
617 | free(blkbuf); |
618 | if (badblocks) |
619 | bb_info_msg("%d bad block(s)", badblocks); |
620 | } |
621 | #endif |
622 | |
623 | // cleanup |
624 | if (ENABLE_FEATURE_CLEAN_UP) { |
625 | free(buf); |
626 | close(dev); |
627 | } |
628 | |
629 | return 0; |
630 | } |
631 |