source: mainline/uspace/app/mkminix/mkminix.c@ 56df02f

lfn serial ticket/834-toolchain-update topic/fix-logger-deadlock topic/msim-upgrade topic/simplify-dev-export
Last change on this file since 56df02f was 56df02f, checked in by Maurizio Lombardi <m.lombardi85@…>, 15 years ago

Fix comment
  • Property mode set to 100644
File size: 14.3 KB
Line 
1/*
2 * Copyright (c) 2010 Jiri Svoboda
3 * Copyright (c) 2011 Maurizio Lombardi
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * - Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * - Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * - The name of the author may not be used to endorse or promote products
16 * derived from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29
30/** @addtogroup fs
31 * @{
32 */
33
34/**
35 * @file mkminix.c
36 * @brief Tool for creating new Minix file systems.
37 *
38 */
39
40#include <stdio.h>
41#include <stdlib.h>
42#include <libblock.h>
43#include <unistd.h>
44#include <errno.h>
45#include <sys/typefmt.h>
46#include <inttypes.h>
47#include <str.h>
48#include <getopt.h>
49#include <mem.h>
50#include <str.h>
51#include <minix.h>
52
53#define NAME "mkminix"
54
55#define FREE 0
56#define USED 1
57
58#define UPPER(n, size) (((n) / (size)) + (((n) % (size)) != 0))
59#define NEXT_DENTRY(p, dirsize) (p += dirsize)
60
61typedef enum {
62 HELP_SHORT,
63 HELP_LONG
64} help_level_t;
65
66/*Generic MFS superblock*/
67struct mfs_sb_info {
68 devmap_handle_t handle;
69 uint64_t n_inodes;
70 uint64_t n_zones;
71 aoff64_t dev_nblocks;
72 aoff64_t devblock_size;
73 unsigned long ibmap_blocks;
74 unsigned long zbmap_blocks;
75 unsigned long first_data_zone;
76 unsigned long itable_size;
77 int log2_zone_size;
78 int ino_per_block;
79 int dirsize;
80 uint32_t max_file_size;
81 uint16_t magic;
82 uint32_t block_size;
83 int fs_version;
84 bool longnames;
85};
86
87static void help_cmd_mkminix(help_level_t level);
88static int num_of_set_bits(uint32_t n);
89static void init_superblock(struct mfs_sb_info *sb);
90static void write_superblock(struct mfs_sb_info *sbi);
91static void write_superblock3(struct mfs_sb_info *sbi);
92static void init_bitmaps(struct mfs_sb_info *sb);
93static void init_inode_table(struct mfs_sb_info *sb);
94static void make_root_ino(struct mfs_sb_info *sb);
95static void make_root_ino3(struct mfs_sb_info *sb);
96static void mark_bmap(uint32_t *bmap, int idx, int v);
97static void insert_dentries(struct mfs_sb_info *sb);
98
99static struct option const long_options[] = {
100 { "help", no_argument, 0, 'h' },
101 { "long-names", no_argument, 0, 'l' },
102 { "block-size", required_argument, 0, 'b' },
103 { "inodes", required_argument, 0, 'i' },
104 { NULL, no_argument, 0, '1' },
105 { NULL, no_argument, 0, '2' },
106 { NULL, no_argument, 0, '3' },
107 { 0, 0, 0, 0 }
108};
109
110int main (int argc, char **argv)
111{
112 int rc, c, opt_ind;
113 char *device_name;
114
115 struct mfs_sb_info sb;
116
117 /*Default is MinixFS V3*/
118 sb.magic = MFS_MAGIC_V3;
119
120 /*Default block size is 4Kb*/
121 sb.block_size = MFS_MAX_BLOCKSIZE;
122 sb.n_inodes = 0;
123 sb.longnames = false;
124 sb.ino_per_block = V3_INODES_PER_BLOCK(MFS_MAX_BLOCKSIZE);
125
126 if (argc == 1) {
127 help_cmd_mkminix(HELP_SHORT);
128 printf("Incorrect number of arguments, try `mkminix --help'\n");
129 exit(0);
130 }
131
132 for (c = 0, optind = 0, opt_ind = 0; c != -1;) {
133 c = getopt_long(argc, argv, "lh123b:i:", long_options, &opt_ind);
134 switch (c) {
135 case 'h':
136 help_cmd_mkminix(HELP_LONG);
137 exit(0);
138 case '1':
139 sb.magic = MFS_MAGIC_V1;
140 sb.block_size = MFS_BLOCKSIZE;
141 sb.fs_version = 1;
142 sb.ino_per_block = V1_INODES_PER_BLOCK;
143 sb.dirsize = MFS_DIRSIZE;
144 break;
145 case '2':
146 sb.magic = MFS_MAGIC_V2;
147 sb.block_size = MFS_BLOCKSIZE;
148 sb.fs_version = 2;
149 sb.ino_per_block = V2_INODES_PER_BLOCK;
150 sb.dirsize = MFS_DIRSIZE;
151 break;
152 case '3':
153 sb.magic = MFS_MAGIC_V3;
154 sb.fs_version = 3;
155 sb.block_size = MFS_MAX_BLOCKSIZE;
156 sb.dirsize = MFS3_DIRSIZE;
157 break;
158 case 'b':
159 sb.block_size = (uint32_t) strtol(optarg, NULL, 10);
160 break;
161 case 'i':
162 sb.n_inodes = (uint64_t) strtol(optarg, NULL, 10);
163 break;
164 case 'l':
165 sb.longnames = true;
166 sb.dirsize = MFSL_DIRSIZE;
167 break;
168 }
169 }
170
171 if (sb.block_size < MFS_MIN_BLOCKSIZE ||
172 sb.block_size > MFS_MAX_BLOCKSIZE) {
173 printf(NAME ":Error! Invalid block size.\n");
174 exit(0);
175 } else if (num_of_set_bits(sb.block_size) != 1) {
176 /*Block size must be a power of 2.*/
177 printf(NAME ":Error! Invalid block size.\n");
178 exit(0);
179 } else if (sb.block_size > MFS_BLOCKSIZE &&
180 sb.fs_version != 3) {
181 printf(NAME ":Error! Block size > 1024 is supported by V3 filesystem only.\n");
182 exit(0);
183 } else if (sb.fs_version == 3 && sb.longnames) {
184 printf(NAME ":Error! Long filenames are supported by V1/V2 filesystem only.\n");
185 exit(0);
186 }
187
188 argv += optind;
189
190 device_name = argv[0];
191
192 if (!device_name) {
193 help_cmd_mkminix(HELP_LONG);
194 exit(0);
195 }
196
197 rc = devmap_device_get_handle(device_name, &sb.handle, 0);
198 if (rc != EOK) {
199 printf(NAME ": Error resolving device `%s'.\n", device_name);
200 return 2;
201 }
202
203 rc = block_init(sb.handle, MFS_MIN_BLOCKSIZE);
204 if (rc != EOK) {
205 printf(NAME ": Error initializing libblock.\n");
206 return 2;
207 }
208
209 rc = block_get_bsize(sb.handle, &sb.devblock_size);
210 if (rc != EOK) {
211 printf(NAME ": Error determining device block size.\n");
212 return 2;
213 }
214
215 rc = block_get_nblocks(sb.handle, &sb.dev_nblocks);
216 if (rc != EOK) {
217 printf(NAME ": Warning, failed to obtain block device size.\n");
218 } else {
219 printf(NAME ": Block device has %" PRIuOFF64 " blocks.\n",
220 sb.dev_nblocks);
221 }
222
223 if (sb.devblock_size != 512) {
224 printf(NAME ": Error. Device block size is not 512 bytes.\n");
225 return 2;
226 }
227
228 /*Minimum block size is 1 Kb*/
229 sb.dev_nblocks /= 2;
230
231 printf(NAME ": Creating Minix file system on device\n");
232
233 /*Initialize superblock*/
234 init_superblock(&sb);
235
236 /*Initialize bitmaps*/
237 init_bitmaps(&sb);
238
239 /*Init inode table*/
240 init_inode_table(&sb);
241
242 /*Insert directory entries . and ..*/
243 insert_dentries(&sb);
244
245 return 0;
246}
247
248static void insert_dentries(struct mfs_sb_info *sb)
249{
250 void *root_block;
251 const long root_dblock = sb->first_data_zone * (sb->block_size / MFS_MIN_BLOCKSIZE);
252
253 root_block = (void *) malloc(MFS_MIN_BLOCKSIZE);
254
255 if (sb->fs_version != 3) {
256 /*Directories entry for V1/V2 filesystem*/
257 struct mfs_dentry *dentry = root_block;
258
259 dentry->d_inum = MFS_ROOT_INO;
260 str_cpy(dentry->d_name, 1, ".");
261
262 NEXT_DENTRY(dentry, sb->dirsize);
263
264 dentry->d_inum = MFS_ROOT_INO;
265 str_cpy(dentry->d_name, 2, "..");
266 } else {
267 /*Directories entry for V3 filesystem*/
268 struct mfs3_dentry *dentry = root_block;
269
270 dentry->d_inum = MFS_ROOT_INO;
271 str_cpy(dentry->d_name, 1, ".");
272
273 NEXT_DENTRY(dentry, sb->dirsize);
274
275 dentry->d_inum = MFS_ROOT_INO;
276 str_cpy(dentry->d_name, 2, "..");
277 }
278
279 block_write_direct(sb->handle, root_dblock, 1, root_block);
280
281 free(root_block);
282}
283
284static void init_inode_table(struct mfs_sb_info *sb)
285{
286 unsigned int i;
287 uint8_t *itable_buf;
288 long itable_pos = 2 + sb->zbmap_blocks + sb->ibmap_blocks;
289
290 itable_buf = malloc(sb->block_size);
291 memset(itable_buf, 0x00, sb->block_size);
292
293 const int chunks = sb->block_size / MFS_BLOCKSIZE;
294
295 for (i = 0; i < sb->itable_size; ++i, ++itable_pos)
296 block_write_direct(sb->handle, itable_pos, chunks, itable_buf);
297
298 free(itable_buf);
299
300 /*Make the root inode*/
301 if (sb->fs_version != 3)
302 make_root_ino(sb);
303 else
304 make_root_ino3(sb);
305}
306
307static void make_root_ino(struct mfs_sb_info *sb)
308{
309 struct mfs_inode *ino_buf;
310 const size_t bufsize = MFS_BLOCKSIZE;
311 const long itable_pos = 2 + sb->zbmap_blocks + sb->ibmap_blocks;
312
313 ino_buf = (struct mfs_inode *) malloc(bufsize);
314 memset(ino_buf, 0x00, bufsize);
315
316 ino_buf[MFS_ROOT_INO].i_mode = S_IFDIR;
317 ino_buf[MFS_ROOT_INO].i_uid = 0;
318 ino_buf[MFS_ROOT_INO].i_gid = 0;
319 ino_buf[MFS_ROOT_INO].i_size = (sb->longnames ? MFSL_DIRSIZE : MFS_DIRSIZE) * 2;
320 ino_buf[MFS_ROOT_INO].i_mtime = 0;
321 ino_buf[MFS_ROOT_INO].i_nlinks = 2;
322 ino_buf[MFS_ROOT_INO].i_dzone[0] = sb->first_data_zone;
323
324 block_write_direct(sb->handle, itable_pos, 1, ino_buf);
325
326 free(ino_buf);
327}
328
329static void make_root_ino3(struct mfs_sb_info *sb)
330{
331 struct mfs2_inode *ino_buf;
332 const size_t bufsize = MFS_MIN_BLOCKSIZE;
333 const long itable_pos = 2 + sb->zbmap_blocks + sb->ibmap_blocks;
334
335 ino_buf = (struct mfs2_inode *) malloc(bufsize);
336 memset(ino_buf, 0x00, bufsize);
337
338 ino_buf[MFS_ROOT_INO].i_mode = S_IFDIR;
339 ino_buf[MFS_ROOT_INO].i_uid = 0;
340 ino_buf[MFS_ROOT_INO].i_gid = 0;
341 ino_buf[MFS_ROOT_INO].i_size = MFS3_DIRSIZE * 2;
342 ino_buf[MFS_ROOT_INO].i_mtime = 0;
343 ino_buf[MFS_ROOT_INO].i_atime = 0;
344 ino_buf[MFS_ROOT_INO].i_ctime = 0;
345 ino_buf[MFS_ROOT_INO].i_nlinks = 2;
346 ino_buf[MFS_ROOT_INO].i_dzone[0] = sb->first_data_zone;
347
348 block_write_direct(sb->handle, itable_pos * (sb->block_size / MFS_MIN_BLOCKSIZE), 1, ino_buf);
349
350 free(ino_buf);
351}
352
353static void init_superblock(struct mfs_sb_info *sb)
354{
355 aoff64_t inodes;
356
357 if (sb->longnames)
358 sb->magic = sb->fs_version == 1 ? MFS_MAGIC_V1L : MFS_MAGIC_V2L;
359
360 /*Compute the number of zones on disk*/
361
362 if (sb->fs_version == 1) {
363 /*Valid only for MFS V1*/
364 sb->n_zones = sb->dev_nblocks > UINT16_MAX ?
365 UINT16_MAX : sb->dev_nblocks;
366 } else {
367 /*Valid for MFS V2/V3*/
368 sb->n_zones = sb->dev_nblocks > UINT32_MAX ?
369 UINT32_MAX : sb->dev_nblocks;
370
371 if (sb->fs_version == 3) {
372 sb->ino_per_block = V3_INODES_PER_BLOCK(sb->block_size);
373 sb->n_zones /= (sb->block_size / MFS_MIN_BLOCKSIZE);
374 }
375 }
376
377 /*Round up the number of inodes to fill block size*/
378 if (sb->n_inodes == 0)
379 inodes = sb->dev_nblocks / 3;
380 else
381 inodes = sb->n_inodes;
382
383 if (inodes % sb->ino_per_block)
384 inodes = ((inodes / sb->ino_per_block) + 1) * sb->ino_per_block;
385
386 if (sb->fs_version < 3)
387 sb->n_inodes = inodes > UINT16_MAX ? UINT16_MAX : inodes;
388 else
389 sb->n_inodes = inodes > UINT32_MAX ? UINT32_MAX : inodes;
390
391 /*Compute inode bitmap size in blocks*/
392 sb->ibmap_blocks = UPPER(sb->n_inodes, sb->block_size * 8);
393
394 /*Compute zone bitmap size in blocks*/
395 sb->zbmap_blocks = UPPER(sb->n_zones, sb->block_size * 8);
396
397 /*Compute inode table size*/
398 sb->itable_size = sb->n_inodes / sb->ino_per_block;
399
400 /*Compute first data zone position*/
401 sb->first_data_zone = 2 + sb->itable_size +
402 sb->zbmap_blocks + sb->ibmap_blocks;
403
404 /*Set log2 of zone to block ratio to zero*/
405 sb->log2_zone_size = 0;
406
407 /*Superblock is now ready to be written on disk*/
408 printf(NAME ": %d inodes\n", (uint32_t) sb->n_inodes);
409 printf(NAME ": %d zones\n", (uint32_t) sb->n_zones);
410 printf(NAME ": inode table blocks = %ld\n", sb->itable_size);
411 printf(NAME ": inode bitmap blocks = %ld\n", sb->ibmap_blocks);
412 printf(NAME ": zone bitmap blocks = %ld\n", sb->zbmap_blocks);
413 printf(NAME ": first data zone = %d\n", (uint32_t) sb->first_data_zone);
414 printf(NAME ": long fnames = %s\n", sb->longnames ? "Yes" : "No");
415
416 if (sb->fs_version == 3)
417 write_superblock3(sb);
418 else
419 write_superblock(sb);
420}
421
422static void write_superblock(struct mfs_sb_info *sbi)
423{
424 struct mfs_superblock *sb;
425
426 sb = (struct mfs_superblock *) malloc(MFS_SUPERBLOCK_SIZE);;
427
428 sb->s_ninodes = (uint16_t) sbi->n_inodes;
429 sb->s_nzones = (uint16_t) sbi->n_zones;
430 sb->s_nzones2 = (uint32_t) sbi->n_zones;
431 sb->s_ibmap_blocks = (uint16_t) sbi->ibmap_blocks;
432 sb->s_zbmap_blocks = (uint16_t) sbi->zbmap_blocks;
433 sb->s_first_data_zone = (uint16_t) sbi->first_data_zone;
434 sb->s_log2_zone_size = sbi->log2_zone_size;
435 sb->s_max_file_size = UINT32_MAX;
436 sb->s_magic = sbi->magic;
437 sb->s_state = MFS_VALID_FS;
438
439 block_write_direct(sbi->handle, MFS_SUPERBLOCK, 1, sb);
440 free(sb);
441}
442
443static void write_superblock3(struct mfs_sb_info *sbi)
444{
445 struct mfs3_superblock *sb;
446
447 sb = (struct mfs3_superblock *) malloc(MFS_SUPERBLOCK_SIZE);
448
449 sb->s_ninodes = (uint32_t) sbi->n_inodes;
450 sb->s_nzones = (uint32_t) sbi->n_zones;
451 sb->s_ibmap_blocks = (uint16_t) sbi->ibmap_blocks;
452 sb->s_zbmap_blocks = (uint16_t) sbi->zbmap_blocks;
453 sb->s_first_data_zone = (uint16_t) sbi->first_data_zone;
454 sb->s_log2_zone_size = sbi->log2_zone_size;
455 sb->s_max_file_size = UINT32_MAX;
456 sb->s_magic = sbi->magic;
457 sb->s_block_size = sbi->block_size;
458 sb->s_disk_version = 3;
459
460 block_write_direct(sbi->handle, MFS_SUPERBLOCK, 1, sb);
461 free(sb);
462}
463
464static void init_bitmaps(struct mfs_sb_info *sb)
465{
466 uint32_t *ibmap_buf, *zbmap_buf;
467 int ibmap_nblocks = 1 + (sb->n_inodes / 8) / sb->block_size;
468 int zbmap_nblocks = 1 + (sb->n_zones / 8) / sb->block_size;
469 unsigned int i;
470
471 ibmap_buf = (uint32_t *) malloc(ibmap_nblocks * sb->block_size);
472 zbmap_buf = (uint32_t *) malloc(zbmap_nblocks * sb->block_size);
473
474 memset(ibmap_buf, 0xFF, ibmap_nblocks * sb->block_size);
475 memset(zbmap_buf, 0xFF, zbmap_nblocks * sb->block_size);
476
477 for (i = 2; i < sb->n_inodes; ++i)
478 mark_bmap(ibmap_buf, i, FREE);
479
480 for (i = 2; i < sb->n_zones; ++i)
481 mark_bmap(zbmap_buf, i, FREE);
482
483 ibmap_nblocks *= sb->block_size / MFS_BLOCKSIZE;
484 zbmap_nblocks *= sb->block_size / MFS_BLOCKSIZE;
485
486 block_write_direct(sb->handle, 2, ibmap_nblocks, ibmap_buf);
487 block_write_direct(sb->handle, 2 + ibmap_nblocks, zbmap_nblocks, zbmap_buf);
488
489 free(ibmap_buf);
490 free(zbmap_buf);
491}
492
493static void mark_bmap(uint32_t *bmap, int idx, int v)
494{
495 if (v == FREE)
496 bmap[idx / 32] &= ~(1 << (idx % 32));
497 else
498 bmap[idx / 32] |= 1 << (idx % 32);
499}
500
501static void help_cmd_mkminix(help_level_t level)
502{
503 if (level == HELP_SHORT) {
504 printf(NAME": tool to create new Minix file systems\n");
505 } else {
506 printf("Usage: [options] device\n"
507 "-1 Make a Minix version 1 filesystem\n"
508 "-2 Make a Minix version 2 filesystem\n"
509 "-3 Make a Minix version 3 filesystem\n"
510 "-b ## Specify the block size in bytes (V3 only),\n"
511 " valid block size values are 1024, 2048 and 4096 bytes per block\n"
512 "-i ## Specify the number of inodes for the filesystem\n"
513 "-l Use 30-char long filenames (V1/V2 only)\n");
514 }
515}
516
517static int num_of_set_bits(uint32_t n)
518{
519 n = n - ((n >> 1) & 0x55555555);
520 n = (n & 0x33333333) + ((n >> 2) & 0x33333333);
521 return (((n + (n >> 4)) & 0xF0F0F0F) * 0x1010101) >> 24;
522}
523
524
525/**
526 * @}
527 */
Note: See TracBrowser for help on using the repository browser.