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Commit | Line | Data |
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66e19ef8 | 1 | /* minix.c - The minix filesystem, version 1 and 2. */ |
2 | /* | |
3 | * GRUB -- GRand Unified Bootloader | |
f36cc108 | 4 | * Copyright (C) 2004,2005,2006,2007,2008 Free Software Foundation, Inc. |
66e19ef8 | 5 | * |
5a79f472 | 6 | * GRUB is free software: you can redistribute it and/or modify |
66e19ef8 | 7 | * it under the terms of the GNU General Public License as published by |
5a79f472 | 8 | * the Free Software Foundation, either version 3 of the License, or |
66e19ef8 | 9 | * (at your option) any later version. |
10 | * | |
5a79f472 | 11 | * GRUB is distributed in the hope that it will be useful, |
66e19ef8 | 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
5a79f472 | 17 | * along with GRUB. If not, see <http://www.gnu.org/licenses/>. |
66e19ef8 | 18 | */ |
19 | ||
20 | #include <grub/err.h> | |
21 | #include <grub/file.h> | |
22 | #include <grub/mm.h> | |
23 | #include <grub/misc.h> | |
24 | #include <grub/disk.h> | |
25 | #include <grub/dl.h> | |
26 | #include <grub/types.h> | |
27 | ||
28 | #define GRUB_MINIX_MAGIC 0x137F | |
29 | #define GRUB_MINIX2_MAGIC 0x2468 | |
30 | #define GRUB_MINIX_MAGIC_30 0x138F | |
31 | #define GRUB_MINIX2_MAGIC_30 0x2478 | |
32 | #define GRUB_MINIX_BSIZE 1024U | |
33 | #define GRUB_MINIX_LOG2_BSIZE 1 | |
34 | #define GRUB_MINIX_ROOT_INODE 1 | |
35 | #define GRUB_MINIX_MAX_SYMLNK_CNT 8 | |
36 | #define GRUB_MINIX_SBLOCK 2 | |
37 | ||
38 | #define GRUB_MINIX_IFDIR 0040000U | |
39 | #define GRUB_MINIX_IFLNK 0120000U | |
40 | ||
41 | #define GRUB_MINIX_INODE(data,field) (data->version == 1 ? \ | |
42 | data->inode. field : data->inode2. field) | |
43 | #define GRUB_MINIX_INODE_ENDIAN(data,field,bits1,bits2) (data->version == 1 ? \ | |
44 | grub_le_to_cpu##bits1 (data->inode.field) : \ | |
45 | grub_le_to_cpu##bits2 (data->inode2.field)) | |
46 | #define GRUB_MINIX_INODE_SIZE(data) GRUB_MINIX_INODE_ENDIAN (data,size,16,32) | |
47 | #define GRUB_MINIX_INODE_MODE(data) GRUB_MINIX_INODE_ENDIAN (data,mode,16,16) | |
48 | #define GRUB_MINIX_INODE_DIR_ZONES(data,blk) GRUB_MINIX_INODE_ENDIAN \ | |
49 | (data,dir_zones[blk],16,32) | |
50 | #define GRUB_MINIX_INODE_INDIR_ZONE(data) \ | |
51 | GRUB_MINIX_INODE_ENDIAN (data,indir_zone,16,32) | |
52 | #define GRUB_MINIX_INODE_DINDIR_ZONE(data) \ | |
53 | GRUB_MINIX_INODE_ENDIAN (data,double_indir_zone,16,32) | |
54 | #define GRUB_MINIX_INODE_BLKSZ(data) (data->version == 1 ? 2 : 4) | |
55 | #define GRUB_MINIX_LOG2_ZONESZ (GRUB_MINIX_LOG2_BSIZE \ | |
56 | + grub_le_to_cpu16 (sblock->log2_zone_size)) | |
57 | #define GRUB_MINIX_ZONESZ (GRUB_MINIX_BSIZE \ | |
58 | << grub_le_to_cpu16 (sblock->log2_zone_size)) | |
59 | ||
60 | struct grub_minix_sblock | |
61 | { | |
62 | grub_uint16_t inode_cnt; | |
63 | grub_uint16_t zone_cnt; | |
64 | grub_uint16_t inode_bmap_size; | |
65 | grub_uint16_t zone_bmap_size; | |
66 | grub_uint16_t first_data_zone; | |
67 | grub_uint16_t log2_zone_size; | |
68 | grub_uint32_t max_file_size; | |
69 | grub_uint16_t magic; | |
70 | }; | |
71 | ||
72 | struct grub_minix_inode | |
73 | { | |
74 | grub_uint16_t mode; | |
75 | grub_uint16_t uid; | |
76 | grub_uint16_t size; | |
77 | grub_uint32_t ctime; | |
78 | grub_uint8_t gid; | |
79 | grub_uint8_t nlinks; | |
80 | grub_uint16_t dir_zones[7]; | |
81 | grub_uint16_t indir_zone; | |
82 | grub_uint16_t double_indir_zone; | |
83 | }; | |
84 | ||
85 | struct grub_minix2_inode | |
86 | { | |
87 | grub_uint16_t mode; | |
88 | grub_uint16_t nlinks; | |
89 | grub_uint16_t uid; | |
90 | grub_uint16_t gid; | |
91 | grub_uint32_t size; | |
92 | grub_uint32_t atime; | |
93 | grub_uint32_t mtime; | |
94 | grub_uint32_t ctime; | |
95 | grub_uint32_t dir_zones[7]; | |
96 | grub_uint32_t indir_zone; | |
97 | grub_uint32_t double_indir_zone; | |
98 | grub_uint32_t unused; | |
99 | ||
100 | }; | |
101 | ||
102 | /* Information about a "mounted" minix filesystem. */ | |
103 | struct grub_minix_data | |
104 | { | |
105 | struct grub_minix_sblock sblock; | |
106 | struct grub_minix_inode inode; | |
107 | struct grub_minix2_inode inode2; | |
108 | int ino; | |
109 | int linknest; | |
110 | grub_disk_t disk; | |
111 | int version; | |
112 | int filename_size; | |
113 | }; | |
114 | ||
66e19ef8 | 115 | static grub_dl_t my_mod; |
66e19ef8 | 116 | \f |
117 | static grub_err_t grub_minix_find_file (struct grub_minix_data *data, | |
118 | const char *path); | |
119 | ||
120 | static int | |
121 | grub_minix_get_file_block (struct grub_minix_data *data, unsigned int blk) | |
122 | { | |
123 | struct grub_minix_sblock *sblock = &data->sblock; | |
124 | int indir; | |
125 | ||
94bc45af | 126 | auto int grub_get_indir (int, int); |
127 | ||
66e19ef8 | 128 | /* Read the block pointer in ZONE, on the offset NUM. */ |
129 | int grub_get_indir (int zone, int num) | |
130 | { | |
131 | if (data->version == 1) | |
132 | { | |
94bc45af | 133 | grub_uint16_t indir16; |
66e19ef8 | 134 | grub_disk_read (data->disk, |
135 | zone << GRUB_MINIX_LOG2_ZONESZ, | |
136 | sizeof (grub_uint16_t) * num, | |
94bc45af | 137 | sizeof (grub_uint16_t), (char *) &indir16); |
138 | return grub_le_to_cpu16 (indir16); | |
66e19ef8 | 139 | } |
140 | else | |
141 | { | |
94bc45af | 142 | grub_uint32_t indir32; |
66e19ef8 | 143 | grub_disk_read (data->disk, |
144 | zone << GRUB_MINIX_LOG2_ZONESZ, | |
145 | sizeof (grub_uint32_t) * num, | |
94bc45af | 146 | sizeof (grub_uint32_t), (char *) &indir32); |
147 | return grub_le_to_cpu32 (indir32); | |
66e19ef8 | 148 | } |
149 | } | |
150 | ||
151 | /* Direct block. */ | |
152 | if (blk < 7) | |
153 | return GRUB_MINIX_INODE_DIR_ZONES (data, blk); | |
154 | ||
155 | /* Indirect block. */ | |
156 | blk -= 7; | |
157 | if (blk < GRUB_MINIX_ZONESZ / GRUB_MINIX_INODE_BLKSZ (data)) | |
158 | { | |
159 | indir = grub_get_indir (GRUB_MINIX_INODE_INDIR_ZONE (data), blk); | |
160 | return indir; | |
161 | } | |
162 | ||
163 | /* Double indirect block. */ | |
164 | blk -= GRUB_MINIX_ZONESZ / GRUB_MINIX_INODE_BLKSZ (data); | |
165 | if (blk < (GRUB_MINIX_ZONESZ / GRUB_MINIX_INODE_BLKSZ (data)) | |
166 | * (GRUB_MINIX_ZONESZ / GRUB_MINIX_INODE_BLKSZ (data))) | |
167 | { | |
168 | indir = grub_get_indir (GRUB_MINIX_INODE_DINDIR_ZONE (data), | |
169 | blk / GRUB_MINIX_ZONESZ); | |
170 | ||
171 | indir = grub_get_indir (indir, blk % GRUB_MINIX_ZONESZ); | |
172 | ||
173 | return indir; | |
174 | } | |
175 | ||
176 | /* This should never happen. */ | |
177 | grub_error (GRUB_ERR_OUT_OF_RANGE, "file bigger than maximum size"); | |
178 | ||
179 | return 0; | |
180 | } | |
181 | ||
182 | ||
183 | /* Read LEN bytes from the file described by DATA starting with byte | |
184 | POS. Return the amount of read bytes in READ. */ | |
185 | static grub_ssize_t | |
186 | grub_minix_read_file (struct grub_minix_data *data, | |
9959f7db | 187 | void NESTED_FUNC_ATTR (*read_hook) (grub_disk_addr_t sector, |
66e19ef8 | 188 | unsigned offset, unsigned length), |
524a1e6a | 189 | int pos, grub_disk_addr_t len, char *buf) |
66e19ef8 | 190 | { |
191 | struct grub_minix_sblock *sblock = &data->sblock; | |
192 | int i; | |
193 | int blockcnt; | |
194 | ||
195 | /* Adjust len so it we can't read past the end of the file. */ | |
196 | if (len > GRUB_MINIX_INODE_SIZE (data)) | |
197 | len = GRUB_MINIX_INODE_SIZE (data); | |
198 | ||
199 | blockcnt = (len + pos + GRUB_MINIX_BSIZE - 1) / GRUB_MINIX_BSIZE; | |
200 | ||
201 | for (i = pos / GRUB_MINIX_BSIZE; i < blockcnt; i++) | |
202 | { | |
203 | int blknr; | |
204 | int blockoff = pos % GRUB_MINIX_BSIZE; | |
205 | int blockend = GRUB_MINIX_BSIZE; | |
206 | ||
207 | int skipfirst = 0; | |
208 | ||
209 | blknr = grub_minix_get_file_block (data, i); | |
210 | if (grub_errno) | |
211 | return -1; | |
212 | ||
213 | /* Last block. */ | |
214 | if (i == blockcnt - 1) | |
215 | { | |
216 | blockend = (len + pos) % GRUB_MINIX_BSIZE; | |
217 | ||
218 | if (!blockend) | |
219 | blockend = GRUB_MINIX_BSIZE; | |
220 | } | |
221 | ||
222 | /* First block. */ | |
223 | if (i == (pos / (int) GRUB_MINIX_BSIZE)) | |
224 | { | |
225 | skipfirst = blockoff; | |
226 | blockend -= skipfirst; | |
227 | } | |
228 | ||
229 | data->disk->read_hook = read_hook; | |
230 | grub_disk_read (data->disk, blknr << GRUB_MINIX_LOG2_ZONESZ, | |
231 | skipfirst, blockend, buf); | |
232 | ||
233 | data->disk->read_hook = 0; | |
234 | if (grub_errno) | |
235 | return -1; | |
236 | ||
237 | buf += GRUB_MINIX_BSIZE - skipfirst; | |
238 | } | |
239 | ||
240 | return len; | |
241 | } | |
242 | ||
243 | ||
244 | /* Read inode INO from the mounted filesystem described by DATA. This | |
245 | inode is used by default now. */ | |
246 | static grub_err_t | |
247 | grub_minix_read_inode (struct grub_minix_data *data, int ino) | |
248 | { | |
249 | struct grub_minix_sblock *sblock = &data->sblock; | |
250 | ||
251 | /* Block in which the inode is stored. */ | |
252 | int block; | |
253 | data->ino = ino; | |
254 | ||
255 | /* The first inode in minix is inode 1. */ | |
256 | ino--; | |
257 | ||
258 | block = ((2 + grub_le_to_cpu16 (sblock->inode_bmap_size) | |
259 | + grub_le_to_cpu16 (sblock->zone_bmap_size)) | |
260 | << GRUB_MINIX_LOG2_BSIZE); | |
261 | ||
262 | if (data->version == 1) | |
263 | { | |
264 | block += ino / (GRUB_DISK_SECTOR_SIZE / sizeof (struct grub_minix_inode)); | |
265 | int offs = (ino % (GRUB_DISK_SECTOR_SIZE | |
266 | / sizeof (struct grub_minix_inode)) | |
267 | * sizeof (struct grub_minix_inode)); | |
268 | ||
269 | grub_disk_read (data->disk, block, offs, | |
238e871f | 270 | sizeof (struct grub_minix_inode), &data->inode); |
66e19ef8 | 271 | } |
272 | else | |
273 | { | |
274 | block += ino / (GRUB_DISK_SECTOR_SIZE | |
275 | / sizeof (struct grub_minix2_inode)); | |
276 | int offs = (ino | |
277 | % (GRUB_DISK_SECTOR_SIZE / sizeof (struct grub_minix2_inode)) | |
278 | * sizeof (struct grub_minix2_inode)); | |
279 | ||
280 | grub_disk_read (data->disk, block, offs, | |
238e871f | 281 | sizeof (struct grub_minix2_inode),&data->inode2); |
66e19ef8 | 282 | } |
283 | ||
284 | return GRUB_ERR_NONE; | |
285 | } | |
286 | ||
287 | ||
288 | /* Lookup the symlink the current inode points to. INO is the inode | |
289 | number of the directory the symlink is relative to. */ | |
290 | static grub_err_t | |
291 | grub_minix_lookup_symlink (struct grub_minix_data *data, int ino) | |
292 | { | |
293 | char symlink[GRUB_MINIX_INODE_SIZE (data) + 1]; | |
294 | ||
295 | if (++data->linknest > GRUB_MINIX_MAX_SYMLNK_CNT) | |
296 | return grub_error (GRUB_ERR_SYMLINK_LOOP, "too deep nesting of symlinks"); | |
297 | ||
298 | if (grub_minix_read_file (data, 0, 0, | |
299 | GRUB_MINIX_INODE_SIZE (data), symlink) < 0) | |
300 | return grub_errno; | |
301 | ||
302 | symlink[GRUB_MINIX_INODE_SIZE (data)] = '\0'; | |
303 | ||
304 | /* The symlink is an absolute path, go back to the root inode. */ | |
305 | if (symlink[0] == '/') | |
306 | ino = GRUB_MINIX_ROOT_INODE; | |
307 | ||
308 | /* Now load in the old inode. */ | |
309 | if (grub_minix_read_inode (data, ino)) | |
310 | return grub_errno; | |
311 | ||
312 | grub_minix_find_file (data, symlink); | |
313 | if (grub_errno) | |
314 | grub_error (grub_errno, "Can not follow symlink `%s'.", symlink); | |
315 | ||
316 | return grub_errno; | |
317 | } | |
318 | ||
319 | ||
320 | /* Find the file with the pathname PATH on the filesystem described by | |
321 | DATA. */ | |
322 | static grub_err_t | |
323 | grub_minix_find_file (struct grub_minix_data *data, const char *path) | |
324 | { | |
78026bce | 325 | char fpath[grub_strlen (path) + 1]; |
66e19ef8 | 326 | char *name = fpath; |
327 | char *next; | |
328 | unsigned int pos = 0; | |
329 | int dirino; | |
330 | ||
78026bce | 331 | grub_strcpy (fpath, path); |
66e19ef8 | 332 | |
333 | /* Skip the first slash. */ | |
334 | if (name[0] == '/') | |
335 | { | |
336 | name++; | |
337 | if (!*name) | |
338 | return 0; | |
339 | } | |
340 | ||
341 | /* Extract the actual part from the pathname. */ | |
342 | next = grub_strchr (name, '/'); | |
343 | if (next) | |
344 | { | |
345 | next[0] = '\0'; | |
346 | next++; | |
347 | } | |
348 | ||
349 | do | |
350 | { | |
351 | grub_uint16_t ino; | |
352 | char filename[data->filename_size + 1]; | |
353 | ||
354 | if (grub_strlen (name) == 0) | |
355 | return GRUB_ERR_NONE; | |
356 | ||
357 | if (grub_minix_read_file (data, 0, pos, sizeof (ino), | |
358 | (char *) &ino) < 0) | |
359 | return grub_errno; | |
360 | if (grub_minix_read_file (data, 0, pos + sizeof (ino), | |
361 | data->filename_size, (char *) filename)< 0) | |
362 | return grub_errno; | |
363 | ||
364 | filename[data->filename_size] = '\0'; | |
365 | ||
366 | /* Check if the current direntry matches the current part of the | |
367 | pathname. */ | |
368 | if (!grub_strcmp (name, filename)) | |
369 | { | |
370 | dirino = data->ino; | |
371 | grub_minix_read_inode (data, grub_le_to_cpu16 (ino)); | |
372 | ||
373 | /* Follow the symlink. */ | |
374 | if ((GRUB_MINIX_INODE_MODE (data) | |
375 | & GRUB_MINIX_IFLNK) == GRUB_MINIX_IFLNK) | |
376 | { | |
377 | grub_minix_lookup_symlink (data, dirino); | |
378 | if (grub_errno) | |
379 | return grub_errno; | |
380 | } | |
381 | ||
382 | if (!next) | |
383 | return 0; | |
384 | ||
385 | pos = 0; | |
386 | ||
387 | name = next; | |
388 | next = grub_strchr (name, '/'); | |
389 | if (next) | |
390 | { | |
391 | next[0] = '\0'; | |
392 | next++; | |
393 | } | |
394 | ||
395 | if ((GRUB_MINIX_INODE_MODE (data) | |
396 | & GRUB_MINIX_IFDIR) != GRUB_MINIX_IFDIR) | |
397 | return grub_error (GRUB_ERR_BAD_FILE_TYPE, "not a directory"); | |
398 | ||
399 | continue; | |
400 | } | |
401 | ||
402 | pos += sizeof (ino) + data->filename_size; | |
403 | } while (pos < GRUB_MINIX_INODE_SIZE (data)); | |
404 | ||
405 | grub_error (GRUB_ERR_FILE_NOT_FOUND, "file not found"); | |
406 | return grub_errno; | |
407 | } | |
408 | ||
409 | ||
410 | /* Mount the filesystem on the disk DISK. */ | |
411 | static struct grub_minix_data * | |
412 | grub_minix_mount (grub_disk_t disk) | |
413 | { | |
414 | struct grub_minix_data *data; | |
415 | ||
416 | data = grub_malloc (sizeof (struct grub_minix_data)); | |
417 | if (!data) | |
418 | return 0; | |
419 | ||
420 | /* Read the superblock. */ | |
421 | grub_disk_read (disk, GRUB_MINIX_SBLOCK, 0, | |
238e871f | 422 | sizeof (struct grub_minix_sblock),&data->sblock); |
40fd3a2b | 423 | if (grub_errno) |
424 | goto fail; | |
66e19ef8 | 425 | |
426 | if (grub_le_to_cpu16 (data->sblock.magic) == GRUB_MINIX_MAGIC) | |
427 | { | |
428 | data->version = 1; | |
429 | data->filename_size = 14; | |
430 | } | |
431 | else if (grub_le_to_cpu16 (data->sblock.magic) == GRUB_MINIX2_MAGIC) | |
432 | { | |
433 | data->version = 2; | |
434 | data->filename_size = 14; | |
435 | } | |
436 | else if (grub_le_to_cpu16 (data->sblock.magic) == GRUB_MINIX_MAGIC_30) | |
437 | { | |
438 | data->version = 1; | |
439 | data->filename_size = 30; | |
440 | } | |
441 | else if (grub_le_to_cpu16 (data->sblock.magic) == GRUB_MINIX2_MAGIC_30) | |
442 | { | |
443 | data->version = 2; | |
444 | data->filename_size = 30; | |
445 | } | |
446 | else | |
40fd3a2b | 447 | goto fail; |
448 | ||
66e19ef8 | 449 | data->disk = disk; |
450 | data->linknest = 0; | |
451 | ||
452 | return data; | |
40fd3a2b | 453 | |
454 | fail: | |
455 | grub_free (data); | |
456 | grub_error (GRUB_ERR_BAD_FS, "not a minix filesystem"); | |
457 | return 0; | |
66e19ef8 | 458 | } |
459 | \f | |
460 | static grub_err_t | |
461 | grub_minix_dir (grub_device_t device, const char *path, | |
05aaebfb | 462 | int (*hook) (const char *filename, |
463 | const struct grub_dirhook_info *info)) | |
66e19ef8 | 464 | { |
465 | struct grub_minix_data *data = 0; | |
466 | struct grub_minix_sblock *sblock; | |
467 | unsigned int pos = 0; | |
468 | ||
469 | data = grub_minix_mount (device->disk); | |
470 | if (!data) | |
471 | return grub_errno; | |
472 | ||
473 | grub_minix_read_inode (data, GRUB_MINIX_ROOT_INODE); | |
474 | if (grub_errno) | |
475 | goto fail; | |
476 | ||
477 | sblock = &data->sblock; | |
478 | ||
479 | grub_minix_find_file (data, path); | |
480 | if (grub_errno) | |
481 | goto fail; | |
482 | ||
483 | if ((GRUB_MINIX_INODE_MODE (data) & GRUB_MINIX_IFDIR) != GRUB_MINIX_IFDIR) | |
484 | { | |
485 | grub_error (GRUB_ERR_BAD_FILE_TYPE, "not a directory"); | |
486 | goto fail; | |
487 | } | |
488 | ||
489 | while (pos < GRUB_MINIX_INODE_SIZE (data)) | |
490 | { | |
491 | grub_uint16_t ino; | |
492 | char filename[data->filename_size + 1]; | |
493 | int dirino = data->ino; | |
05aaebfb | 494 | struct grub_dirhook_info info; |
495 | grub_memset (&info, 0, sizeof (info)); | |
496 | ||
66e19ef8 | 497 | |
498 | if (grub_minix_read_file (data, 0, pos, sizeof (ino), | |
499 | (char *) &ino) < 0) | |
500 | return grub_errno; | |
501 | ||
502 | if (grub_minix_read_file (data, 0, pos + sizeof (ino), | |
503 | data->filename_size, | |
504 | (char *) filename) < 0) | |
505 | return grub_errno; | |
506 | filename[data->filename_size] = '\0'; | |
507 | ||
508 | /* The filetype is not stored in the dirent. Read the inode to | |
509 | find out the filetype. This *REALLY* sucks. */ | |
510 | grub_minix_read_inode (data, grub_le_to_cpu16 (ino)); | |
05aaebfb | 511 | info.dir = ((GRUB_MINIX_INODE_MODE (data) |
512 | & GRUB_MINIX_IFDIR) == GRUB_MINIX_IFDIR); | |
513 | if (hook (filename, &info) ? 1 : 0) | |
66e19ef8 | 514 | break; |
515 | ||
516 | /* Load the old inode back in. */ | |
517 | grub_minix_read_inode (data, dirino); | |
518 | ||
519 | pos += sizeof (ino) + data->filename_size; | |
520 | } | |
521 | ||
522 | fail: | |
523 | grub_free (data); | |
524 | return grub_errno; | |
525 | } | |
526 | ||
527 | ||
528 | /* Open a file named NAME and initialize FILE. */ | |
529 | static grub_err_t | |
530 | grub_minix_open (struct grub_file *file, const char *name) | |
531 | { | |
532 | struct grub_minix_data *data; | |
533 | data = grub_minix_mount (file->device->disk); | |
534 | if (!data) | |
535 | return grub_errno; | |
536 | ||
537 | /* Open the inode op the root directory. */ | |
538 | grub_minix_read_inode (data, GRUB_MINIX_ROOT_INODE); | |
539 | if (grub_errno) | |
540 | { | |
541 | grub_free (data); | |
542 | return grub_errno; | |
543 | } | |
544 | ||
545 | if (!name || name[0] != '/') | |
546 | { | |
547 | grub_error (GRUB_ERR_BAD_FILENAME, "bad filename"); | |
548 | return grub_errno; | |
549 | } | |
550 | ||
551 | /* Traverse the directory tree to the node that should be | |
552 | opened. */ | |
553 | grub_minix_find_file (data, name); | |
554 | if (grub_errno) | |
555 | { | |
556 | grub_free (data); | |
557 | return grub_errno; | |
558 | } | |
559 | ||
560 | file->data = data; | |
561 | file->size = GRUB_MINIX_INODE_SIZE (data); | |
562 | ||
563 | return GRUB_ERR_NONE; | |
564 | } | |
565 | ||
566 | ||
567 | static grub_ssize_t | |
524a1e6a | 568 | grub_minix_read (grub_file_t file, char *buf, grub_size_t len) |
66e19ef8 | 569 | { |
570 | struct grub_minix_data *data = | |
571 | (struct grub_minix_data *) file->data; | |
572 | ||
573 | return grub_minix_read_file (data, file->read_hook, file->offset, len, buf); | |
574 | } | |
575 | ||
576 | ||
577 | static grub_err_t | |
578 | grub_minix_close (grub_file_t file) | |
579 | { | |
580 | grub_free (file->data); | |
581 | ||
582 | return GRUB_ERR_NONE; | |
583 | } | |
584 | ||
585 | ||
586 | static grub_err_t | |
587 | grub_minix_label (grub_device_t device __attribute ((unused)), | |
588 | char **label __attribute ((unused))) | |
589 | { | |
590 | return GRUB_ERR_NONE; | |
591 | } | |
592 | ||
593 | \f | |
594 | static struct grub_fs grub_minix_fs = | |
595 | { | |
596 | .name = "minix", | |
597 | .dir = grub_minix_dir, | |
598 | .open = grub_minix_open, | |
599 | .read = grub_minix_read, | |
600 | .close = grub_minix_close, | |
601 | .label = grub_minix_label, | |
602 | .next = 0 | |
603 | }; | |
604 | ||
6d099807 | 605 | GRUB_MOD_INIT(minix) |
66e19ef8 | 606 | { |
607 | grub_fs_register (&grub_minix_fs); | |
608 | my_mod = mod; | |
609 | } | |
610 | ||
6d099807 | 611 | GRUB_MOD_FINI(minix) |
66e19ef8 | 612 | { |
613 | grub_fs_unregister (&grub_minix_fs); | |
614 | } |