source: mainline/uspace/app/mkminix/mkminix.c@ e80b1de

lfn serial ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since e80b1de was e2267e82, checked in by Maurizio Lombardi <m.lombardi85@…>, 14 years ago

code cleanup
  • Property mode set to 100644
File size: 11.4 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 <minix.h>
51
52#define NAME "mkminix"
53
54#define FREE 0
55#define USED 1
56
57#define UPPER(n, size) (((n) / (size)) + (((n) % (size)) != 0))
58
59typedef enum {
60 HELP_SHORT,
61 HELP_LONG
62} help_level_t;
63
64typedef struct mfs_params {
65 uint16_t fs_magic;
66 uint32_t block_size;
67 size_t devblock_size;
68 unsigned long n_inodes;
69 aoff64_t dev_nblocks;
70 bool fs_longnames;
71} mfs_params_t;
72
73static void help_cmd_mkminix(help_level_t level);
74static int num_of_set_bits(uint32_t n);
75static void setup_superblock(struct mfs_superblock *sb, mfs_params_t *opt);
76static void setup_superblock_v3(struct mfs3_superblock *sb, mfs_params_t *opt);
77static void setup_bitmaps(devmap_handle_t handle, uint32_t ninodes,
78 uint32_t nzones, int bsize);
79static void mark_bmap(uint8_t *bmap, int idx, int v);
80
81static struct option const long_options[] = {
82 { "help", no_argument, 0, 'h' },
83 { "long-names", no_argument, 0, 'l' },
84 { "blocks", required_argument, 0, 'b' },
85 { "inodes", required_argument, 0, 'i' },
86 { NULL, no_argument, 0, '1' },
87 { NULL, no_argument, 0, '2' },
88 { NULL, no_argument, 0, '3' },
89 { 0, 0, 0, 0 }
90};
91
92int main (int argc, char **argv)
93{
94 int rc, c, opt_ind;
95 char *device_name;
96 devmap_handle_t handle;
97
98 struct mfs_superblock *sb;
99 struct mfs3_superblock *sb3;
100
101 mfs_params_t opt;
102
103 /*Default is MinixFS V3*/
104 opt.fs_magic = MFS_MAGIC_V3;
105
106 /*Default block size is 4Kb*/
107 opt.block_size = MFS_MAX_BLOCKSIZE;
108 opt.n_inodes = 0;
109 opt.fs_longnames = false;
110
111 if (argc == 1) {
112 help_cmd_mkminix(HELP_SHORT);
113 printf("Incorrect number of arguments, try `mkminix --help'\n");
114 exit(0);
115 }
116
117 for (c = 0, optind = 0, opt_ind = 0; c != -1;) {
118 c = getopt_long(argc, argv, "lh123b:i:", long_options, &opt_ind);
119 switch (c) {
120 case 'h':
121 help_cmd_mkminix(HELP_LONG);
122 exit(0);
123 case '1':
124 opt.fs_magic = MFS_MAGIC_V1;
125 opt.block_size = MFS_BLOCKSIZE;
126 break;
127 case '2':
128 opt.fs_magic = MFS_MAGIC_V2;
129 opt.block_size = MFS_BLOCKSIZE;
130 break;
131 case '3':
132 opt.fs_magic = MFS_MAGIC_V3;
133 break;
134 case 'b':
135 opt.block_size = (uint32_t) strtol(optarg, NULL, 10);
136 break;
137 case 'i':
138 opt.n_inodes = (unsigned long) strtol(optarg, NULL, 10);
139 break;
140 case 'l':
141 opt.fs_longnames = true;
142 break;
143 }
144 }
145
146 if (opt.block_size < MFS_MIN_BLOCKSIZE ||
147 opt.block_size > MFS_MAX_BLOCKSIZE) {
148 printf(NAME ":Error! Invalid block size.\n");
149 exit(0);
150 } else if (num_of_set_bits(opt.block_size) != 1) {
151 /*Block size must be a power of 2.*/
152 printf(NAME ":Error! Invalid block size.\n");
153 exit(0);
154 } else if (opt.block_size > MFS_BLOCKSIZE &&
155 opt.fs_magic != MFS_MAGIC_V3) {
156 printf(NAME ":Error! Block size > 1024 is supported by V3 filesystem only.\n");
157 exit(0);
158 } else if (opt.fs_magic == MFS_MAGIC_V3 && opt.fs_longnames) {
159 printf(NAME ":Error! Long filenames are supported by V1/V2 filesystem only.\n");
160 exit(0);
161 }
162
163 argv += optind;
164
165 device_name = argv[0];
166
167 if (!device_name) {
168 help_cmd_mkminix(HELP_LONG);
169 exit(0);
170 }
171
172 rc = devmap_device_get_handle(device_name, &handle, 0);
173 if (rc != EOK) {
174 printf(NAME ": Error resolving device `%s'.\n", device_name);
175 return 2;
176 }
177
178 rc = block_init(handle, MFS_MIN_BLOCKSIZE);
179 if (rc != EOK) {
180 printf(NAME ": Error initializing libblock.\n");
181 return 2;
182 }
183
184 rc = block_get_bsize(handle, &opt.devblock_size);
185 if (rc != EOK) {
186 printf(NAME ": Error determining device block size.\n");
187 return 2;
188 }
189
190 rc = block_get_nblocks(handle, &opt.dev_nblocks);
191 if (rc != EOK) {
192 printf(NAME ": Warning, failed to obtain block device size.\n");
193 } else {
194 printf(NAME ": Block device has %" PRIuOFF64 " blocks.\n",
195 opt.dev_nblocks);
196 }
197
198 if (opt.devblock_size != 512) {
199 printf(NAME ": Error. Device block size is not 512 bytes.\n");
200 return 2;
201 }
202
203 /*Minimum block size is 1 Kb*/
204 opt.dev_nblocks /= 2;
205
206 printf(NAME ": Creating Minix file system on device\n");
207
208 /*Setting up superblock*/
209
210 if (opt.fs_magic == MFS_MAGIC_V3) {
211 sb3 = (struct mfs3_superblock *) malloc(sizeof(struct mfs3_superblock));
212 if (!sb3) {
213 printf(NAME ": Error, not enough memory");
214 return 2;
215 }
216 setup_superblock_v3(sb3, &opt);
217 block_write_direct(handle, MFS_SUPERBLOCK, 1, sb3);
218 setup_bitmaps(handle, sb3->s_ninodes,
219 sb3->s_nzones, sb3->s_block_size);
220 } else {
221 sb = (struct mfs_superblock *) malloc(sizeof(struct mfs_superblock));
222 if (!sb) {
223 printf(NAME ": Error, not enough memory");
224 return 2;
225 }
226 setup_superblock(sb, &opt);
227 block_write_direct(handle, MFS_SUPERBLOCK, 1, sb);
228 setup_bitmaps(handle, sb->s_ninodes, sb->s_nzones, MFS_BLOCKSIZE);
229 }
230
231 return 0;
232}
233
234static void setup_superblock(struct mfs_superblock *sb, mfs_params_t *opt)
235{
236 int ino_per_block = 0;
237 int fs_version;
238 aoff64_t inodes;
239
240 if (opt->fs_magic == MFS_MAGIC_V1) {
241 fs_version = 1;
242 ino_per_block = V1_INODES_PER_BLOCK;
243 if (opt->fs_longnames)
244 opt->fs_magic = MFS_MAGIC_V1L;
245 } else {
246 fs_version = 2;
247 ino_per_block = V2_INODES_PER_BLOCK;
248 if (opt->fs_longnames)
249 opt->fs_magic = MFS_MAGIC_V2L;
250 }
251
252 sb->s_magic = opt->fs_magic;
253
254 /*Compute the number of zones on disk*/
255
256 /*Valid only for MFS V1*/
257 sb->s_nzones = opt->dev_nblocks > UINT16_MAX ?
258 UINT16_MAX : opt->dev_nblocks;
259
260 /*Valid only for MFS V2*/
261 sb->s_nzones2 = opt->dev_nblocks > UINT32_MAX ?
262 UINT32_MAX : opt->dev_nblocks;
263
264 /*Round up the number of inodes to fill block size*/
265 if (opt->n_inodes == 0)
266 inodes = opt->dev_nblocks / 3;
267 else
268 inodes = opt->n_inodes;
269
270 if (inodes % ino_per_block)
271 inodes = ((inodes / ino_per_block) + 1) * ino_per_block;
272 sb->s_ninodes = inodes > UINT16_MAX ? UINT16_MAX : inodes;
273
274 /*Compute inode bitmap size in blocks*/
275 sb->s_ibmap_blocks = UPPER(sb->s_ninodes, MFS_BLOCKSIZE * 8);
276
277 /*Compute zone bitmap size in blocks*/
278 if (fs_version == 1)
279 sb->s_zbmap_blocks = UPPER(sb->s_nzones, MFS_BLOCKSIZE * 8);
280 else
281 sb->s_zbmap_blocks = UPPER(sb->s_nzones2, MFS_BLOCKSIZE * 8);
282
283 /*Compute inode table size*/
284 unsigned long ninodes_blocks = sb->s_ninodes / ino_per_block;
285
286 /*Compute first data zone position*/
287 sb->s_first_data_zone = 2 + ninodes_blocks +
288 sb->s_zbmap_blocks + sb->s_ibmap_blocks;
289
290 /*Set log2 of zone to block ratio to zero*/
291 sb->s_log2_zone_size = 0;
292
293 /*Superblock is now ready to be written on disk*/
294 printf(NAME ": %d inodes\n", sb->s_ninodes);
295 printf(NAME ": %d zones\n", sb->s_nzones2);
296 printf(NAME ": inode table blocks = %ld\n", ninodes_blocks);
297 printf(NAME ": first data zone = %d\n", sb->s_first_data_zone);
298 printf(NAME ": long fnames = %s\n", opt->fs_longnames ? "Yes" : "No");
299}
300
301static void setup_superblock_v3(struct mfs3_superblock *sb, mfs_params_t *opt)
302{
303 int ino_per_block;
304 int bs;
305 aoff64_t inodes;
306
307 sb->s_magic = opt->fs_magic;
308 bs = opt->block_size;
309
310 if (opt->n_inodes == 0)
311 inodes = opt->dev_nblocks / 3;
312 else
313 inodes = opt->n_inodes;
314
315 /*Round up the number of inodes to fill block size*/
316 ino_per_block = V3_INODES_PER_BLOCK(bs);
317 if (inodes % ino_per_block)
318 inodes = ((inodes / ino_per_block) + 1) * ino_per_block;
319 sb->s_ninodes = inodes > UINT32_MAX ? UINT32_MAX : inodes;
320
321 /*Compute the number of zones on disk*/
322 sb->s_nzones = opt->dev_nblocks > UINT32_MAX ?
323 UINT32_MAX : opt->dev_nblocks;
324 sb->s_nzones /= (bs / MFS_MIN_BLOCKSIZE);
325
326 /*Compute inode bitmap size in blocks*/
327 sb->s_ibmap_blocks = UPPER(sb->s_ninodes, bs * 8);
328
329 /*Compute zone bitmap size in blocks*/
330 sb->s_zbmap_blocks = UPPER(sb->s_nzones, bs * 8);
331
332 /*Compute inode table size*/
333 unsigned long ninodes_blocks = sb->s_ninodes / ino_per_block;
334
335 /*Compute first data zone position*/
336 sb->s_first_data_zone = 2 + ninodes_blocks +
337 sb->s_zbmap_blocks + sb->s_ibmap_blocks;
338
339 /*Set log2 of zone to block ratio to zero*/
340 sb->s_log2_zone_size = 0;
341 sb->s_disk_version = 3;
342 sb->s_block_size = bs;
343
344 /*Superblock is now ready to be written on disk*/
345 printf(NAME ": %d inodes\n", sb->s_ninodes);
346 printf(NAME ": %d zones\n", sb->s_nzones);
347 printf(NAME ": block size = %d\n", sb->s_block_size);
348 printf(NAME ": inode table blocks = %ld\n", ninodes_blocks);
349 printf(NAME ": first data zone = %d\n", sb->s_first_data_zone);
350}
351
352static void setup_bitmaps(devmap_handle_t handle, uint32_t ninodes,
353 uint32_t nzones, int bsize)
354{
355 uint8_t *ibmap_buf, *zbmap_buf;
356 int ibmap_nblocks = 1 + (ninodes / 8) / bsize;
357 int zbmap_nblocks = 1 + (nzones / 8) / bsize;
358 unsigned int i;
359
360 ibmap_buf = (uint8_t *) malloc(ibmap_nblocks * bsize);
361 zbmap_buf = (uint8_t *) malloc(zbmap_nblocks * bsize);
362
363 memset(ibmap_buf, 0xFF, ibmap_nblocks * bsize);
364 memset(zbmap_buf, 0xFF, zbmap_nblocks * bsize);
365
366 for (i = 2; i < ninodes; ++i) {
367 mark_bmap(ibmap_buf, i, FREE);
368 mark_bmap(zbmap_buf, i, FREE);
369 }
370
371 ibmap_nblocks *= bsize / MFS_BLOCKSIZE;
372 zbmap_nblocks *= bsize / MFS_BLOCKSIZE;
373
374 block_write_direct(handle, 2, ibmap_nblocks, ibmap_buf);
375 block_write_direct(handle, 2 + ibmap_nblocks, zbmap_nblocks, zbmap_buf);
376}
377
378static void mark_bmap(uint8_t *bmap, int idx, int v)
379{
380 if (v == FREE)
381 bmap[idx / 8] &= ~(1 << (idx % 8));
382 else
383 bmap[idx / 8] |= 1 << (idx % 8);
384}
385
386static void help_cmd_mkminix(help_level_t level)
387{
388 if (level == HELP_SHORT) {
389 printf(NAME": tool to create new Minix file systems\n");
390 } else {
391 printf("Usage: [options] device\n"
392 "-1 Make a Minix version 1 filesystem\n"
393 "-2 Make a Minix version 2 filesystem\n"
394 "-3 Make a Minix version 3 filesystem\n"
395 "-b ## Specify the block size in bytes (V3 only),\n"
396 " valid block size values are 1024, 2048 and 4096 bytes per block\n"
397 "-i ## Specify the number of inodes for the filesystem\n"
398 "-l Use 30-char long filenames (V1/V2 only)\n");
399 }
400}
401
402static int num_of_set_bits(uint32_t n)
403{
404 n = n - ((n >> 1) & 0x55555555);
405 n = (n & 0x33333333) + ((n >> 2) & 0x33333333);
406 return (((n + (n >> 4)) & 0xF0F0F0F) * 0x1010101) >> 24;
407}
408
409
410/**
411 * @}
412 */
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