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aa033560 | 1 | /* jfs.c - JFS. */ |
2 | /* | |
3 | * GRUB -- GRand Unified Bootloader | |
f36cc108 | 4 | * Copyright (C) 2004,2005,2006,2007,2008 Free Software Foundation, Inc. |
aa033560 | 5 | * |
5a79f472 | 6 | * GRUB is free software: you can redistribute it and/or modify |
aa033560 | 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 |
aa033560 | 9 | * (at your option) any later version. |
10 | * | |
5a79f472 | 11 | * GRUB is distributed in the hope that it will be useful, |
aa033560 | 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/>. |
aa033560 | 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_JFS_MAX_SYMLNK_CNT 8 | |
29 | #define GRUB_JFS_FILETYPE_MASK 0170000 | |
30 | #define GRUB_JFS_FILETYPE_REG 0100000 | |
31 | #define GRUB_JFS_FILETYPE_LNK 0120000 | |
32 | #define GRUB_JFS_FILETYPE_DIR 0040000 | |
33 | ||
34 | #define GRUB_JFS_SBLOCK 64 | |
35 | #define GRUB_JFS_AGGR_INODE 2 | |
36 | #define GRUB_JFS_FS1_INODE_BLK 104 | |
37 | ||
38 | #define GRUB_JFS_TREE_LEAF 2 | |
39 | ||
40 | struct grub_jfs_sblock | |
41 | { | |
42 | /* The magic for JFS. It should contain the string "JFS1". */ | |
43 | grub_uint8_t magic[4]; | |
44 | grub_uint32_t version; | |
45 | grub_uint64_t ag_size; | |
46 | ||
47 | /* The size of a filesystem block in bytes. XXX: currently only | |
48 | 4096 was tested. */ | |
49 | grub_uint32_t blksz; | |
50 | grub_uint16_t log2_blksz; | |
51 | ||
52 | grub_uint8_t unused[71]; | |
53 | grub_uint8_t volname[11]; | |
54 | }; | |
55 | ||
56 | struct grub_jfs_extent | |
57 | { | |
58 | /* The length of the extent in filesystem blocks. */ | |
59 | grub_uint16_t length; | |
60 | grub_uint8_t length2; | |
61 | ||
62 | /* The physical offset of the first block on the disk. */ | |
63 | grub_uint8_t blk1; | |
64 | grub_uint32_t blk2; | |
65 | } __attribute__ ((packed)); | |
66 | ||
67 | struct grub_jfs_iag | |
68 | { | |
69 | grub_uint8_t unused[3072]; | |
70 | struct grub_jfs_extent inodes[128]; | |
71 | } __attribute__ ((packed)); | |
72 | ||
73 | ||
74 | /* The head of the tree used to find extents. */ | |
75 | struct grub_jfs_treehead | |
76 | { | |
77 | grub_uint64_t next; | |
78 | grub_uint64_t prev; | |
79 | ||
80 | grub_uint8_t flags; | |
81 | grub_uint8_t unused; | |
82 | ||
83 | grub_uint16_t count; | |
84 | grub_uint16_t max; | |
85 | grub_uint8_t unused2[10]; | |
86 | } __attribute__ ((packed)); | |
87 | ||
88 | /* A node in the extent tree. */ | |
89 | struct grub_jfs_tree_extent | |
90 | { | |
91 | grub_uint8_t flags; | |
92 | grub_uint16_t unused; | |
93 | ||
94 | /* The offset is the key used to lookup an extent. */ | |
95 | grub_uint8_t offset1; | |
96 | grub_uint32_t offset2; | |
97 | ||
98 | struct grub_jfs_extent extent; | |
99 | } __attribute__ ((packed)); | |
100 | ||
101 | /* The tree of directory entries. */ | |
102 | struct grub_jfs_tree_dir | |
103 | { | |
104 | /* Pointers to the previous and next tree headers of other nodes on | |
105 | this level. */ | |
106 | grub_uint64_t nextb; | |
107 | grub_uint64_t prevb; | |
108 | ||
109 | grub_uint8_t flags; | |
110 | ||
111 | /* The amount of dirents in this node. */ | |
112 | grub_uint8_t count; | |
113 | grub_uint8_t freecnt; | |
114 | grub_uint8_t freelist; | |
115 | grub_uint8_t maxslot; | |
116 | ||
117 | /* The location of the sorted array of pointers to dirents. */ | |
118 | grub_uint8_t sindex; | |
119 | grub_uint8_t unused[10]; | |
120 | } __attribute__ ((packed)); | |
121 | ||
122 | /* An internal node in the dirents tree. */ | |
123 | struct grub_jfs_internal_dirent | |
124 | { | |
125 | struct grub_jfs_extent ex; | |
126 | grub_uint8_t next; | |
127 | grub_uint8_t len; | |
128 | grub_uint16_t namepart[11]; | |
129 | } __attribute__ ((packed)); | |
130 | ||
131 | /* A leaf node in the dirents tree. */ | |
132 | struct grub_jfs_leaf_dirent | |
133 | { | |
134 | /* The inode for this dirent. */ | |
135 | grub_uint32_t inode; | |
136 | grub_uint8_t next; | |
137 | ||
138 | /* The size of the name. */ | |
139 | grub_uint8_t len; | |
140 | grub_uint16_t namepart[11]; | |
141 | grub_uint32_t index; | |
142 | } __attribute__ ((packed)); | |
143 | ||
144 | /* A leaf in the dirents tree. This one is used if the previously | |
145 | dirent was not big enough to store the name. */ | |
146 | struct grub_jfs_leaf_next_dirent | |
147 | { | |
148 | grub_uint8_t next; | |
149 | grub_uint8_t len; | |
150 | grub_uint16_t namepart[15]; | |
151 | } __attribute__ ((packed)); | |
152 | ||
153 | struct grub_jfs_inode | |
154 | { | |
155 | grub_uint32_t stamp; | |
156 | grub_uint32_t fileset; | |
157 | grub_uint32_t inode; | |
158 | grub_uint8_t unused[12]; | |
159 | grub_uint64_t size; | |
160 | grub_uint8_t unused2[20]; | |
161 | grub_uint32_t mode; | |
162 | grub_uint8_t unused3[72]; | |
163 | grub_uint8_t unused4[96]; | |
164 | ||
165 | union | |
166 | { | |
167 | /* The tree describing the extents of the file. */ | |
21c8cbb1 | 168 | struct __attribute__ ((packed)) |
aa033560 | 169 | { |
170 | struct grub_jfs_treehead tree; | |
171 | struct grub_jfs_tree_extent extents[16]; | |
21c8cbb1 | 172 | } file; |
aa033560 | 173 | union |
174 | { | |
175 | /* The tree describing the dirents. */ | |
176 | struct | |
177 | { | |
178 | grub_uint8_t unused[16]; | |
179 | grub_uint8_t flags; | |
180 | ||
181 | /* Amount of dirents in this node. */ | |
182 | grub_uint8_t count; | |
183 | grub_uint8_t freecnt; | |
184 | grub_uint8_t freelist; | |
185 | grub_uint32_t idotdot; | |
186 | grub_uint8_t sorted[8]; | |
187 | } header; | |
188 | struct grub_jfs_leaf_dirent dirents[8]; | |
189 | } dir __attribute__ ((packed)); | |
190 | /* Fast symlink. */ | |
191 | struct | |
192 | { | |
193 | grub_uint8_t unused[32]; | |
194 | grub_uint8_t path[128]; | |
195 | } symlink; | |
196 | } __attribute__ ((packed)); | |
197 | } __attribute__ ((packed)); | |
198 | ||
199 | struct grub_jfs_data | |
200 | { | |
201 | struct grub_jfs_sblock sblock; | |
202 | grub_disk_t disk; | |
203 | struct grub_jfs_inode fileset; | |
204 | struct grub_jfs_inode currinode; | |
205 | int pos; | |
206 | int linknest; | |
207 | } __attribute__ ((packed)); | |
208 | ||
209 | struct grub_jfs_diropen | |
210 | { | |
211 | int index; | |
212 | union | |
213 | { | |
214 | struct grub_jfs_tree_dir header; | |
215 | struct grub_jfs_leaf_dirent dirent[0]; | |
216 | struct grub_jfs_leaf_next_dirent next_dirent[0]; | |
217 | char sorted[0]; | |
218 | } *dirpage __attribute__ ((packed)); | |
219 | struct grub_jfs_data *data; | |
220 | struct grub_jfs_inode *inode; | |
221 | int count; | |
222 | char *sorted; | |
223 | struct grub_jfs_leaf_dirent *leaf; | |
224 | struct grub_jfs_leaf_next_dirent *next_leaf; | |
225 | ||
226 | /* The filename and inode of the last read dirent. */ | |
227 | char name[255]; | |
228 | grub_uint32_t ino; | |
229 | } __attribute__ ((packed)); | |
230 | ||
231 | ||
232 | #ifndef GRUB_UTIL | |
233 | static grub_dl_t my_mod; | |
234 | #endif | |
235 | \f | |
236 | static grub_err_t grub_jfs_lookup_symlink (struct grub_jfs_data *data, int ino); | |
237 | ||
238 | /* Get the block number for the block BLK in the node INODE in the | |
239 | mounted filesystem DATA. */ | |
240 | static int | |
241 | grub_jfs_blkno (struct grub_jfs_data *data, struct grub_jfs_inode *inode, | |
242 | unsigned int blk) | |
243 | { | |
244 | auto int getblk (struct grub_jfs_treehead *treehead, | |
245 | struct grub_jfs_tree_extent *extents); | |
246 | ||
247 | int getblk (struct grub_jfs_treehead *treehead, | |
248 | struct grub_jfs_tree_extent *extents) | |
249 | { | |
250 | int found = -1; | |
251 | int i; | |
252 | ||
253 | for (i = 0; i < grub_le_to_cpu16 (treehead->count) - 2; i++) | |
254 | { | |
255 | if (treehead->flags & GRUB_JFS_TREE_LEAF) | |
256 | { | |
257 | /* Read the leafnode. */ | |
258 | if (grub_le_to_cpu32 (extents[i].offset2) <= blk | |
259 | && ((grub_le_to_cpu16 (extents[i].extent.length)) | |
260 | + (extents[i].extent.length2 << 8) | |
261 | + grub_le_to_cpu32 (extents[i].offset2)) > blk) | |
262 | return (blk - grub_le_to_cpu32 (extents[i].offset2) | |
263 | + grub_le_to_cpu32 (extents[i].extent.blk2)); | |
264 | } | |
265 | else | |
266 | if (blk >= grub_le_to_cpu32 (extents[i].offset2)) | |
267 | found = i; | |
268 | } | |
269 | ||
270 | if (found != -1) | |
271 | { | |
272 | struct | |
273 | { | |
274 | struct grub_jfs_treehead treehead; | |
275 | struct grub_jfs_tree_extent extents[254]; | |
276 | } tree; | |
277 | ||
278 | if (grub_disk_read (data->disk, | |
279 | grub_le_to_cpu32 (extents[found].extent.blk2) | |
280 | << (grub_le_to_cpu16 (data->sblock.log2_blksz) | |
281 | - GRUB_DISK_SECTOR_BITS), 0, | |
282 | sizeof (tree), (char *) &tree)) | |
283 | return -1; | |
284 | ||
285 | return getblk (&tree.treehead, &tree.extents[0]); | |
286 | } | |
287 | ||
288 | return -1; | |
289 | } | |
290 | ||
291 | return getblk (&inode->file.tree, &inode->file.extents[0]); | |
292 | } | |
293 | ||
294 | ||
295 | static grub_err_t | |
296 | grub_jfs_read_inode (struct grub_jfs_data *data, int ino, | |
297 | struct grub_jfs_inode *inode) | |
298 | { | |
299 | struct grub_jfs_iag iag; | |
300 | int iagnum = ino / 4096; | |
301 | int inoext = (ino % 4096) / 32; | |
302 | int inonum = (ino % 4096) % 32; | |
303 | grub_uint32_t iagblk; | |
304 | grub_uint32_t inoblk; | |
305 | ||
306 | iagblk = grub_jfs_blkno (data, &data->fileset, iagnum + 1); | |
307 | if (grub_errno) | |
308 | return grub_errno; | |
309 | ||
310 | /* Read in the IAG. */ | |
311 | if (grub_disk_read (data->disk, | |
312 | iagblk << (grub_le_to_cpu16 (data->sblock.log2_blksz) | |
313 | - GRUB_DISK_SECTOR_BITS), 0, | |
314 | sizeof (struct grub_jfs_iag), (char *) &iag)) | |
315 | return grub_errno; | |
316 | ||
317 | inoblk = grub_le_to_cpu32 (iag.inodes[inoext].blk2); | |
318 | inoblk <<= (grub_le_to_cpu16 (data->sblock.log2_blksz) | |
319 | - GRUB_DISK_SECTOR_BITS); | |
320 | inoblk += inonum; | |
321 | ||
322 | if (grub_disk_read (data->disk, inoblk, 0, | |
323 | sizeof (struct grub_jfs_inode), (char *) inode)) | |
324 | return grub_errno; | |
325 | ||
326 | return 0; | |
327 | } | |
328 | ||
329 | ||
330 | static struct grub_jfs_data * | |
331 | grub_jfs_mount (grub_disk_t disk) | |
332 | { | |
333 | struct grub_jfs_data *data = 0; | |
334 | ||
335 | data = grub_malloc (sizeof (struct grub_jfs_data)); | |
336 | if (!data) | |
337 | return 0; | |
338 | ||
339 | /* Read the superblock. */ | |
340 | if (grub_disk_read (disk, GRUB_JFS_SBLOCK, 0, | |
341 | sizeof (struct grub_jfs_sblock), (char *) &data->sblock)) | |
342 | goto fail; | |
343 | ||
7b455f4d | 344 | if (grub_strncmp ((char *) (data->sblock.magic), "JFS1", 4)) |
aa033560 | 345 | { |
346 | grub_error (GRUB_ERR_BAD_FS, "not a jfs filesystem"); | |
347 | goto fail; | |
348 | } | |
349 | ||
350 | data->disk = disk; | |
351 | data->pos = 0; | |
352 | data->linknest = 0; | |
353 | ||
354 | /* Read the inode of the first fileset. */ | |
355 | if (grub_disk_read (data->disk, GRUB_JFS_FS1_INODE_BLK, 0, | |
356 | sizeof (struct grub_jfs_inode), (char *) &data->fileset)) | |
357 | goto fail; | |
358 | ||
359 | return data; | |
360 | ||
361 | fail: | |
362 | grub_free (data); | |
ad0bd20b | 363 | |
364 | if (grub_errno == GRUB_ERR_OUT_OF_RANGE) | |
365 | grub_error (GRUB_ERR_BAD_FS, "not a jfs filesystem"); | |
366 | ||
aa033560 | 367 | return 0; |
368 | } | |
369 | ||
370 | ||
371 | static struct grub_jfs_diropen * | |
372 | grub_jfs_opendir (struct grub_jfs_data *data, struct grub_jfs_inode *inode) | |
373 | { | |
374 | struct grub_jfs_internal_dirent *de; | |
375 | struct grub_jfs_diropen *diro; | |
376 | int blk; | |
377 | ||
378 | de = (struct grub_jfs_internal_dirent *) inode->dir.dirents; | |
379 | ||
380 | if (!((grub_le_to_cpu32 (inode->mode) | |
381 | & GRUB_JFS_FILETYPE_MASK) == GRUB_JFS_FILETYPE_DIR)) | |
382 | { | |
383 | grub_error (GRUB_ERR_BAD_FILE_TYPE, "not a directory"); | |
384 | return 0; | |
385 | } | |
386 | ||
387 | diro = grub_malloc (sizeof (struct grub_jfs_diropen)); | |
388 | if (!diro) | |
389 | return 0; | |
390 | ||
391 | diro->index = 0; | |
392 | diro->data = data; | |
393 | diro->inode = inode; | |
394 | ||
395 | /* Check if the entire tree is contained within the inode. */ | |
396 | if (inode->file.tree.flags & GRUB_JFS_TREE_LEAF) | |
397 | { | |
398 | diro->leaf = inode->dir.dirents; | |
399 | diro->next_leaf = (struct grub_jfs_leaf_next_dirent *) de; | |
7b455f4d | 400 | diro->sorted = (char *) (inode->dir.header.sorted); |
aa033560 | 401 | diro->count = inode->dir.header.count; |
402 | diro->dirpage = 0; | |
403 | ||
404 | return diro; | |
405 | } | |
406 | ||
407 | diro->dirpage = grub_malloc (grub_le_to_cpu32 (data->sblock.blksz)); | |
408 | if (!diro->dirpage) | |
409 | { | |
410 | grub_free (diro); | |
411 | return 0; | |
412 | } | |
413 | ||
414 | blk = grub_le_to_cpu32 (de[inode->dir.header.sorted[0]].ex.blk2); | |
415 | blk <<= (grub_le_to_cpu16 (data->sblock.log2_blksz) - GRUB_DISK_SECTOR_BITS); | |
416 | ||
417 | /* Read in the nodes until we are on the leaf node level. */ | |
418 | do | |
419 | { | |
420 | int index; | |
421 | if (grub_disk_read (data->disk, blk, 0, | |
422 | grub_le_to_cpu32 (data->sblock.blksz), | |
423 | diro->dirpage->sorted)) | |
424 | { | |
425 | grub_free (diro->dirpage); | |
426 | grub_free (diro); | |
427 | return 0; | |
428 | } | |
429 | ||
430 | de = (struct grub_jfs_internal_dirent *) diro->dirpage->dirent; | |
431 | index = diro->dirpage->sorted[diro->dirpage->header.sindex * 32]; | |
432 | blk = (grub_le_to_cpu32 (de[index].ex.blk2) | |
433 | << (grub_le_to_cpu16 (data->sblock.log2_blksz) | |
434 | - GRUB_DISK_SECTOR_BITS)); | |
435 | } while (!(diro->dirpage->header.flags & GRUB_JFS_TREE_LEAF)); | |
436 | ||
437 | diro->leaf = diro->dirpage->dirent; | |
438 | diro->next_leaf = diro->dirpage->next_dirent; | |
439 | diro->sorted = &diro->dirpage->sorted[diro->dirpage->header.sindex * 32]; | |
440 | diro->count = diro->dirpage->header.count; | |
441 | ||
442 | return diro; | |
443 | } | |
444 | ||
445 | ||
446 | static void | |
447 | grub_jfs_closedir (struct grub_jfs_diropen *diro) | |
448 | { | |
449 | if (!diro) | |
450 | return; | |
451 | grub_free (diro->dirpage); | |
452 | grub_free (diro); | |
453 | } | |
454 | ||
455 | ||
456 | /* Read in the next dirent from the directory described by DIRO. */ | |
457 | static grub_err_t | |
458 | grub_jfs_getent (struct grub_jfs_diropen *diro) | |
459 | { | |
460 | int strpos = 0; | |
461 | struct grub_jfs_leaf_dirent *leaf; | |
462 | struct grub_jfs_leaf_next_dirent *next_leaf; | |
463 | int len; | |
464 | int nextent; | |
465 | grub_uint16_t filename[255]; | |
466 | ||
467 | auto void addstr (grub_uint16_t *uname, int ulen); | |
468 | ||
469 | /* Add the unicode string to the utf16 filename buffer. */ | |
470 | void addstr (grub_uint16_t *name, int ulen) | |
471 | { | |
472 | while (ulen--) | |
473 | filename[strpos++] = *(name++); | |
474 | } | |
475 | ||
476 | /* The last node, read in more. */ | |
477 | if (diro->index == diro->count) | |
478 | { | |
479 | unsigned int next; | |
480 | ||
cc85c3c3 | 481 | /* If the inode contains the entry tree or if this was the last |
aa033560 | 482 | node, there is nothing to read. */ |
483 | if ((diro->inode->file.tree.flags & GRUB_JFS_TREE_LEAF) | |
484 | || !grub_le_to_cpu64 (diro->dirpage->header.nextb)) | |
485 | return GRUB_ERR_OUT_OF_RANGE; | |
486 | ||
487 | next = grub_le_to_cpu64 (diro->dirpage->header.nextb); | |
488 | next <<= (grub_le_to_cpu16 (diro->data->sblock.log2_blksz) | |
489 | - GRUB_DISK_SECTOR_BITS); | |
490 | ||
491 | if (grub_disk_read (diro->data->disk, next, 0, | |
492 | grub_le_to_cpu32 (diro->data->sblock.blksz), | |
493 | diro->dirpage->sorted)) | |
494 | return grub_errno; | |
495 | ||
496 | diro->leaf = diro->dirpage->dirent; | |
497 | diro->next_leaf = diro->dirpage->next_dirent; | |
498 | diro->sorted = &diro->dirpage->sorted[diro->dirpage->header.sindex * 32]; | |
499 | diro->count = diro->dirpage->header.count; | |
500 | diro->index = 0; | |
501 | } | |
502 | ||
503 | leaf = &diro->leaf[(int) diro->sorted[diro->index]]; | |
504 | next_leaf = &diro->next_leaf[diro->index]; | |
505 | ||
506 | len = leaf->len; | |
507 | if (!len) | |
508 | { | |
509 | diro->index++; | |
510 | return grub_jfs_getent (diro); | |
511 | } | |
512 | ||
513 | addstr (leaf->namepart, len < 11 ? len : 11); | |
514 | diro->ino = grub_le_to_cpu32 (leaf->inode); | |
515 | len -= 11; | |
516 | ||
517 | /* Move down to the leaf level. */ | |
518 | nextent = leaf->next; | |
519 | if (leaf->next != 255) | |
520 | do | |
521 | { | |
522 | next_leaf = &diro->next_leaf[nextent]; | |
523 | addstr (next_leaf->namepart, len < 15 ? len : 15 ); | |
524 | ||
525 | len -= 15; | |
526 | nextent = next_leaf->next; | |
527 | } while (next_leaf->next != 255 && len > 0); | |
528 | ||
529 | diro->index++; | |
530 | ||
531 | /* Convert the temporary UTF16 filename to UTF8. */ | |
7b455f4d | 532 | *grub_utf16_to_utf8 ((grub_uint8_t *) (diro->name), filename, strpos) = '\0'; |
aa033560 | 533 | |
534 | return 0; | |
535 | } | |
536 | ||
537 | ||
538 | /* Read LEN bytes from the file described by DATA starting with byte | |
539 | POS. Return the amount of read bytes in READ. */ | |
540 | static grub_ssize_t | |
541 | grub_jfs_read_file (struct grub_jfs_data *data, | |
9959f7db | 542 | void NESTED_FUNC_ATTR (*read_hook) (grub_disk_addr_t sector, |
aa033560 | 543 | unsigned offset, unsigned length), |
524a1e6a | 544 | int pos, grub_size_t len, char *buf) |
aa033560 | 545 | { |
546 | int i; | |
547 | int blockcnt; | |
548 | ||
549 | /* Adjust len so it we can't read past the end of the file. */ | |
550 | if (len > data->currinode.size) | |
551 | len = data->currinode.size; | |
552 | ||
553 | blockcnt = ((len + pos + grub_le_to_cpu32 (data->sblock.blksz) - 1) | |
554 | / grub_le_to_cpu32 (data->sblock.blksz)); | |
555 | ||
556 | for (i = pos / grub_le_to_cpu32 (data->sblock.blksz); i < blockcnt; i++) | |
557 | { | |
558 | int blknr; | |
559 | int blockoff = pos % grub_le_to_cpu32 (data->sblock.blksz); | |
560 | int blockend = grub_le_to_cpu32 (data->sblock.blksz); | |
561 | ||
562 | int skipfirst = 0; | |
563 | ||
564 | blknr = grub_jfs_blkno (data, &data->currinode, i); | |
565 | if (grub_errno) | |
566 | return -1; | |
567 | ||
568 | /* Last block. */ | |
569 | if (i == blockcnt - 1) | |
570 | { | |
571 | blockend = (len + pos) % grub_le_to_cpu32 (data->sblock.blksz); | |
572 | ||
573 | if (!blockend) | |
574 | blockend = grub_le_to_cpu32 (data->sblock.blksz); | |
575 | } | |
576 | ||
577 | /* First block. */ | |
578 | if (i == (pos / (int) grub_le_to_cpu32 (data->sblock.blksz))) | |
579 | { | |
580 | skipfirst = blockoff; | |
581 | blockend -= skipfirst; | |
582 | } | |
583 | ||
584 | data->disk->read_hook = read_hook; | |
585 | grub_disk_read (data->disk, | |
586 | blknr << (grub_le_to_cpu16 (data->sblock.log2_blksz) | |
587 | - GRUB_DISK_SECTOR_BITS), | |
588 | skipfirst, blockend, buf); | |
589 | ||
590 | data->disk->read_hook = 0; | |
591 | if (grub_errno) | |
592 | return -1; | |
593 | ||
594 | buf += grub_le_to_cpu32 (data->sblock.blksz) - skipfirst; | |
595 | } | |
596 | ||
597 | return len; | |
598 | } | |
599 | ||
600 | ||
601 | /* Find the file with the pathname PATH on the filesystem described by | |
602 | DATA. */ | |
603 | static grub_err_t | |
604 | grub_jfs_find_file (struct grub_jfs_data *data, const char *path) | |
605 | { | |
606 | char fpath[grub_strlen (path)]; | |
607 | char *name = fpath; | |
608 | char *next; | |
609 | unsigned int pos = 0; | |
610 | struct grub_jfs_diropen *diro; | |
611 | ||
612 | grub_strncpy (fpath, path, grub_strlen (path) + 1); | |
613 | ||
614 | if (grub_jfs_read_inode (data, GRUB_JFS_AGGR_INODE, &data->currinode)) | |
615 | return grub_errno; | |
616 | ||
eb079ba9 | 617 | /* Skip the first slashes. */ |
618 | while (*name == '/') | |
aa033560 | 619 | { |
620 | name++; | |
621 | if (!*name) | |
622 | return 0; | |
623 | } | |
624 | ||
625 | /* Extract the actual part from the pathname. */ | |
626 | next = grub_strchr (name, '/'); | |
627 | if (next) | |
628 | { | |
eb079ba9 | 629 | while (*next == '/') |
630 | { | |
631 | next[0] = '\0'; | |
632 | next++; | |
633 | } | |
aa033560 | 634 | } |
aa033560 | 635 | diro = grub_jfs_opendir (data, &data->currinode); |
636 | if (!diro) | |
637 | return grub_errno; | |
638 | ||
639 | for (;;) | |
640 | { | |
641 | if (grub_strlen (name) == 0) | |
642 | return GRUB_ERR_NONE; | |
643 | ||
644 | if (grub_jfs_getent (diro) == GRUB_ERR_OUT_OF_RANGE) | |
645 | break; | |
646 | ||
647 | /* Check if the current direntry matches the current part of the | |
648 | pathname. */ | |
649 | if (!grub_strcmp (name, diro->name)) | |
650 | { | |
651 | int ino = diro->ino; | |
652 | int dirino = grub_le_to_cpu32 (data->currinode.inode); | |
653 | ||
654 | grub_jfs_closedir (diro); | |
655 | diro = 0; | |
656 | ||
657 | if (grub_jfs_read_inode (data, ino, &data->currinode)) | |
658 | break; | |
659 | ||
660 | /* Check if this is a symlink. */ | |
661 | if ((grub_le_to_cpu32 (data->currinode.mode) | |
662 | & GRUB_JFS_FILETYPE_MASK) == GRUB_JFS_FILETYPE_LNK) | |
663 | { | |
664 | grub_jfs_lookup_symlink (data, dirino); | |
665 | if (grub_errno) | |
666 | return grub_errno; | |
667 | } | |
668 | ||
669 | if (!next) | |
670 | return 0; | |
671 | ||
672 | pos = 0; | |
673 | ||
674 | name = next; | |
675 | next = grub_strchr (name, '/'); | |
676 | if (next) | |
677 | { | |
678 | next[0] = '\0'; | |
679 | next++; | |
680 | } | |
681 | ||
682 | /* Open this directory for reading dirents. */ | |
683 | diro = grub_jfs_opendir (data, &data->currinode); | |
684 | if (!diro) | |
685 | return grub_errno; | |
686 | ||
687 | continue; | |
688 | } | |
689 | } | |
690 | ||
691 | grub_jfs_closedir (diro); | |
692 | grub_error (GRUB_ERR_FILE_NOT_FOUND, "file not found"); | |
693 | return grub_errno; | |
694 | } | |
695 | ||
696 | ||
697 | static grub_err_t | |
698 | grub_jfs_lookup_symlink (struct grub_jfs_data *data, int ino) | |
699 | { | |
700 | int size = grub_le_to_cpu64 (data->currinode.size); | |
701 | char symlink[size + 1]; | |
702 | ||
703 | if (++data->linknest > GRUB_JFS_MAX_SYMLNK_CNT) | |
704 | return grub_error (GRUB_ERR_SYMLINK_LOOP, "too deep nesting of symlinks"); | |
705 | ||
706 | if (size <= 128) | |
7b455f4d | 707 | grub_strncpy (symlink, (char *) (data->currinode.symlink.path), 128); |
aa033560 | 708 | else if (grub_jfs_read_file (data, 0, 0, size, symlink) < 0) |
709 | return grub_errno; | |
710 | ||
711 | symlink[size] = '\0'; | |
712 | ||
713 | /* The symlink is an absolute path, go back to the root inode. */ | |
714 | if (symlink[0] == '/') | |
715 | ino = 2; | |
716 | ||
717 | /* Now load in the old inode. */ | |
718 | if (grub_jfs_read_inode (data, ino, &data->currinode)) | |
719 | return grub_errno; | |
720 | ||
721 | grub_jfs_find_file (data, symlink); | |
722 | if (grub_errno) | |
723 | grub_error (grub_errno, "Can not follow symlink `%s'.", symlink); | |
724 | ||
725 | return grub_errno; | |
726 | } | |
727 | \f | |
728 | ||
729 | static grub_err_t | |
730 | grub_jfs_dir (grub_device_t device, const char *path, | |
05aaebfb | 731 | int (*hook) (const char *filename, |
732 | const struct grub_dirhook_info *info)) | |
aa033560 | 733 | { |
734 | struct grub_jfs_data *data = 0; | |
735 | struct grub_jfs_diropen *diro = 0; | |
736 | ||
737 | #ifndef GRUB_UTIL | |
738 | grub_dl_ref (my_mod); | |
739 | #endif | |
740 | ||
741 | data = grub_jfs_mount (device->disk); | |
742 | if (!data) | |
743 | goto fail; | |
744 | ||
745 | if (grub_jfs_find_file (data, path)) | |
746 | goto fail; | |
747 | ||
748 | diro = grub_jfs_opendir (data, &data->currinode); | |
749 | if (!diro) | |
750 | goto fail; | |
751 | ||
752 | /* Iterate over the dirents in the directory that was found. */ | |
753 | while (grub_jfs_getent (diro) != GRUB_ERR_OUT_OF_RANGE) | |
754 | { | |
755 | struct grub_jfs_inode inode; | |
05aaebfb | 756 | struct grub_dirhook_info info; |
757 | grub_memset (&info, 0, sizeof (info)); | |
aa033560 | 758 | |
759 | if (grub_jfs_read_inode (data, diro->ino, &inode)) | |
760 | goto fail; | |
761 | ||
05aaebfb | 762 | info.dir = (grub_le_to_cpu32 (inode.mode) |
763 | & GRUB_JFS_FILETYPE_MASK) == GRUB_JFS_FILETYPE_DIR; | |
764 | if (hook (diro->name, &info)) | |
aa033560 | 765 | goto fail; |
766 | } | |
767 | ||
768 | /* XXX: GRUB_ERR_OUT_OF_RANGE is used for the last dirent. */ | |
769 | if (grub_errno == GRUB_ERR_OUT_OF_RANGE) | |
770 | grub_errno = 0; | |
771 | ||
772 | fail: | |
773 | grub_jfs_closedir (diro); | |
774 | grub_free (data); | |
775 | ||
776 | #ifndef GRUB_UTIL | |
777 | grub_dl_unref (my_mod); | |
778 | #endif | |
779 | ||
780 | return grub_errno; | |
781 | } | |
782 | ||
783 | ||
784 | /* Open a file named NAME and initialize FILE. */ | |
785 | static grub_err_t | |
786 | grub_jfs_open (struct grub_file *file, const char *name) | |
787 | { | |
788 | struct grub_jfs_data *data; | |
789 | ||
790 | #ifndef GRUB_UTIL | |
791 | grub_dl_ref (my_mod); | |
792 | #endif | |
793 | ||
794 | data = grub_jfs_mount (file->device->disk); | |
795 | if (!data) | |
796 | goto fail; | |
797 | ||
798 | grub_jfs_find_file (data, name); | |
799 | if (grub_errno) | |
800 | goto fail; | |
801 | ||
802 | /* It is only possible for open regular files. */ | |
803 | if (! ((grub_le_to_cpu32 (data->currinode.mode) | |
804 | & GRUB_JFS_FILETYPE_MASK) == GRUB_JFS_FILETYPE_REG)) | |
805 | { | |
806 | grub_error (GRUB_ERR_BAD_FILE_TYPE, "not a regular file"); | |
807 | goto fail; | |
808 | } | |
809 | ||
810 | file->data = data; | |
811 | file->size = grub_le_to_cpu64 (data->currinode.size); | |
812 | ||
813 | return 0; | |
814 | ||
815 | fail: | |
816 | ||
817 | #ifndef GRUB_UTIL | |
818 | grub_dl_unref (my_mod); | |
819 | #endif | |
820 | ||
821 | grub_free (data); | |
822 | ||
823 | return grub_errno;; | |
824 | } | |
825 | ||
826 | ||
827 | static grub_ssize_t | |
524a1e6a | 828 | grub_jfs_read (grub_file_t file, char *buf, grub_size_t len) |
aa033560 | 829 | { |
830 | struct grub_jfs_data *data = | |
831 | (struct grub_jfs_data *) file->data; | |
832 | ||
833 | return grub_jfs_read_file (data, file->read_hook, file->offset, len, buf); | |
834 | } | |
835 | ||
836 | ||
837 | static grub_err_t | |
838 | grub_jfs_close (grub_file_t file) | |
839 | { | |
840 | grub_free (file->data); | |
841 | ||
842 | #ifndef GRUB_UTIL | |
843 | grub_dl_unref (my_mod); | |
844 | #endif | |
845 | ||
846 | return GRUB_ERR_NONE; | |
847 | } | |
848 | ||
849 | ||
850 | static grub_err_t | |
851 | grub_jfs_label (grub_device_t device, char **label) | |
852 | { | |
853 | struct grub_jfs_data *data; | |
854 | data = grub_jfs_mount (device->disk); | |
855 | ||
856 | if (data) | |
7b455f4d | 857 | *label = grub_strndup ((char *) (data->sblock.volname), 11); |
aa033560 | 858 | else |
859 | *label = 0; | |
860 | ||
861 | return grub_errno; | |
862 | } | |
863 | \f | |
864 | ||
865 | static struct grub_fs grub_jfs_fs = | |
866 | { | |
867 | .name = "jfs", | |
868 | .dir = grub_jfs_dir, | |
869 | .open = grub_jfs_open, | |
870 | .read = grub_jfs_read, | |
871 | .close = grub_jfs_close, | |
872 | .label = grub_jfs_label, | |
873 | .next = 0 | |
874 | }; | |
875 | ||
6d099807 | 876 | GRUB_MOD_INIT(jfs) |
aa033560 | 877 | { |
878 | grub_fs_register (&grub_jfs_fs); | |
6d099807 | 879 | #ifndef GRUB_UTIL |
aa033560 | 880 | my_mod = mod; |
6d099807 | 881 | #endif |
aa033560 | 882 | } |
883 | ||
6d099807 | 884 | GRUB_MOD_FINI(jfs) |
aa033560 | 885 | { |
886 | grub_fs_unregister (&grub_jfs_fs); | |
887 | } |