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Commit | Line | Data |
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b2499b29 | 1 | /* xfs.c - XFS. */ |
2 | /* | |
3 | * GRUB -- GRand Unified Bootloader | |
4 | * Copyright (C) 2005 Free Software Foundation, Inc. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
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 | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
19 | */ | |
20 | ||
21 | #include <grub/err.h> | |
22 | #include <grub/file.h> | |
23 | #include <grub/mm.h> | |
24 | #include <grub/misc.h> | |
25 | #include <grub/disk.h> | |
26 | #include <grub/dl.h> | |
27 | #include <grub/types.h> | |
28 | #include <grub/fshelp.h> | |
29 | ||
30 | #define XFS_INODE_EXTENTS 9 | |
31 | ||
32 | #define XFS_INODE_FORMAT_INO 1 | |
33 | #define XFS_INODE_FORMAT_EXT 2 | |
34 | #define XFS_INODE_FORMAT_BTREE 3 | |
35 | ||
36 | ||
37 | struct grub_xfs_sblock | |
38 | { | |
39 | grub_uint8_t magic[4]; | |
40 | grub_uint32_t bsize; | |
41 | grub_uint8_t unused1[48]; | |
42 | grub_uint64_t rootino; | |
43 | grub_uint8_t unused2[20]; | |
44 | grub_uint32_t agsize; | |
45 | grub_uint8_t unused3[20]; | |
46 | grub_uint8_t label[12]; | |
47 | grub_uint8_t log2_bsize; | |
48 | grub_uint8_t unused4[2]; | |
49 | grub_uint8_t log2_inop; | |
50 | grub_uint8_t log2_agblk; | |
51 | } __attribute__ ((packed)); | |
52 | ||
53 | struct grub_xfs_dir_header | |
54 | { | |
55 | grub_uint8_t entries; | |
56 | grub_uint8_t smallino; | |
57 | grub_uint32_t parent; | |
58 | } __attribute__ ((packed)); | |
59 | ||
60 | struct grub_xfs_dir_entry | |
61 | { | |
62 | grub_uint8_t len; | |
63 | grub_uint16_t offset; | |
64 | char name[1]; | |
65 | /* Inode number follows, 32 bits. */ | |
66 | } __attribute__ ((packed)); | |
67 | ||
68 | struct grub_xfs_dir2_entry | |
69 | { | |
70 | grub_uint64_t inode; | |
71 | grub_uint8_t len; | |
72 | } __attribute__ ((packed)); | |
73 | ||
74 | typedef grub_uint32_t grub_xfs_extent[4]; | |
75 | ||
76 | struct grub_xfs_inode | |
77 | { | |
78 | grub_uint8_t magic[2]; | |
79 | grub_uint16_t mode; | |
80 | grub_uint8_t version; | |
81 | grub_uint8_t format; | |
82 | grub_uint8_t unused2[50]; | |
83 | grub_uint64_t size; | |
84 | grub_uint8_t unused3[36]; | |
85 | union | |
86 | { | |
87 | char raw[156]; | |
88 | struct dir | |
89 | { | |
90 | struct grub_xfs_dir_header dirhead; | |
91 | struct grub_xfs_dir_entry direntry[1]; | |
92 | } dir; | |
93 | grub_xfs_extent extents[XFS_INODE_EXTENTS]; | |
94 | } data __attribute__ ((packed)); | |
95 | } __attribute__ ((packed)); | |
96 | ||
97 | struct grub_xfs_dirblock_tail | |
98 | { | |
99 | grub_uint32_t leaf_count; | |
100 | grub_uint32_t leaf_stale; | |
101 | } __attribute__ ((packed)); | |
102 | ||
103 | struct grub_fshelp_node | |
104 | { | |
105 | struct grub_xfs_data *data; | |
106 | struct grub_xfs_inode inode; | |
107 | grub_uint64_t ino; | |
108 | int inode_read; | |
109 | }; | |
110 | ||
111 | struct grub_xfs_data | |
112 | { | |
113 | struct grub_xfs_sblock sblock; | |
114 | struct grub_xfs_inode *inode; | |
115 | grub_disk_t disk; | |
116 | int pos; | |
117 | int bsize; | |
118 | int agsize; | |
119 | struct grub_fshelp_node diropen; | |
120 | ||
121 | }; | |
b4093103 | 122 | |
123 | #ifndef GRUB_UTIL | |
124 | static grub_dl_t my_mod; | |
125 | #endif | |
126 | ||
b2499b29 | 127 | \f |
128 | ||
129 | /* Filetype information as used in inodes. */ | |
130 | #define FILETYPE_INO_MASK 0170000 | |
131 | #define FILETYPE_INO_REG 0100000 | |
132 | #define FILETYPE_INO_DIRECTORY 0040000 | |
133 | #define FILETYPE_INO_SYMLINK 0120000 | |
134 | ||
135 | #define GRUB_XFS_INO_AGBITS(data) \ | |
136 | ((data)->sblock.log2_agblk + (data)->sblock.log2_inop) | |
137 | #define GRUB_XFS_INO_INOINAG(data, ino) \ | |
138 | (grub_be_to_cpu64 (ino) & ((1 << GRUB_XFS_INO_AGBITS (data)) - 1)) | |
139 | #define GRUB_XFS_INO_AG(data,ino) \ | |
140 | (grub_be_to_cpu64 (ino) >> GRUB_XFS_INO_AGBITS (data)) | |
141 | ||
142 | #define GRUB_XFS_EXTENT_OFFSET(inode,ex) \ | |
143 | ((grub_be_to_cpu32 ((inode)->data.extents[ex][0]) & ~(1 << 31)) << 23 \ | |
144 | | grub_be_to_cpu32 ((inode)->data.extents[ex][1]) >> 9) | |
145 | ||
146 | #define GRUB_XFS_EXTENT_BLOCK(inode,ex) \ | |
147 | ((grub_uint64_t) (grub_be_to_cpu32 ((inode)->data.extents[ex][1]) \ | |
148 | & (~255)) << 43 \ | |
149 | | (grub_uint64_t) grub_be_to_cpu32 ((inode)->data.extents[ex][2]) << 11 \ | |
150 | | grub_be_to_cpu32 ((inode)->data.extents[ex][3]) >> 21) | |
151 | ||
152 | #define GRUB_XFS_EXTENT_SIZE(inode,ex) \ | |
153 | (grub_be_to_cpu32 ((inode)->data.extents[ex][3]) & ((1 << 20) - 1)) | |
154 | ||
155 | #define GRUB_XFS_ROUND_TO_DIRENT(pos) ((((pos) + 8 - 1) / 8) * 8) | |
156 | #define GRUB_XFS_NEXT_DIRENT(pos,len) \ | |
157 | (pos) + GRUB_XFS_ROUND_TO_DIRENT (8 + 1 + len + 2) | |
158 | \f | |
688e5699 | 159 | static inline int |
160 | grub_xfs_inode_block (struct grub_xfs_data *data, | |
161 | grub_uint64_t ino) | |
b2499b29 | 162 | { |
163 | long long int inoinag = GRUB_XFS_INO_INOINAG (data, ino); | |
164 | long long ag = GRUB_XFS_INO_AG (data, ino); | |
165 | long long block; | |
166 | ||
167 | block = (inoinag >> 4) + ag * data->agsize; | |
168 | block <<= (data->sblock.log2_bsize - GRUB_DISK_SECTOR_BITS); | |
169 | return block; | |
170 | } | |
171 | ||
172 | ||
688e5699 | 173 | static inline int |
174 | grub_xfs_inode_offset (struct grub_xfs_data *data, | |
175 | grub_uint64_t ino) | |
b2499b29 | 176 | { |
177 | int inoag = GRUB_XFS_INO_INOINAG (data, ino); | |
178 | return (inoag & ((1 << 4) - 1)) << 8; | |
179 | } | |
180 | ||
181 | ||
182 | static grub_err_t | |
183 | grub_xfs_read_inode (struct grub_xfs_data *data, grub_uint64_t ino, | |
184 | struct grub_xfs_inode *inode) | |
185 | { | |
186 | int block = grub_xfs_inode_block (data, ino); | |
187 | int offset = grub_xfs_inode_offset (data, ino); | |
188 | ||
189 | /* Read the inode. */ | |
190 | if (grub_disk_read (data->disk, block, offset, | |
191 | sizeof (struct grub_xfs_inode), (char *) inode)) | |
192 | return grub_errno; | |
193 | ||
194 | if (grub_strncmp (inode->magic, "IN", 2)) | |
195 | return grub_error (GRUB_ERR_BAD_FS, "not a correct XFS inode.\n"); | |
196 | ||
197 | return 0; | |
198 | } | |
199 | ||
200 | ||
201 | static int | |
202 | grub_xfs_read_block (grub_fshelp_node_t node, int fileblock) | |
203 | { | |
204 | int ex; | |
205 | ||
206 | if (node->inode.format != XFS_INODE_FORMAT_EXT) | |
207 | { | |
208 | grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET, | |
209 | "xfs does not support inode format %d yet", | |
210 | node->inode.format); | |
211 | return 0; | |
212 | } | |
213 | ||
214 | /* Iterate over each extent to figure out which extent has | |
215 | the block we are looking for. */ | |
216 | for (ex = 0; ex < XFS_INODE_EXTENTS; ex++) | |
217 | { | |
218 | grub_uint64_t start = GRUB_XFS_EXTENT_BLOCK (&node->inode, ex); | |
219 | int offset = GRUB_XFS_EXTENT_OFFSET (&node->inode, ex); | |
220 | int size = GRUB_XFS_EXTENT_SIZE (&node->inode, ex); | |
221 | ||
222 | unsigned int ag = start >> node->data->sblock.log2_agblk; | |
223 | unsigned int block = start & ((1 << node->data->sblock.log2_agblk) - 1); | |
224 | ||
225 | if (fileblock < offset + size) | |
226 | return (fileblock - offset + block) + ag * node->data->agsize; | |
227 | } | |
228 | ||
229 | grub_error (GRUB_ERR_FILE_READ_ERROR, | |
230 | "xfs block %d for inode %d is not in an extent.\n", | |
231 | fileblock, grub_be_to_cpu64 (node->ino)); | |
232 | return 0; | |
233 | } | |
234 | ||
235 | ||
236 | /* Read LEN bytes from the file described by DATA starting with byte | |
237 | POS. Return the amount of read bytes in READ. */ | |
238 | static grub_ssize_t | |
239 | grub_xfs_read_file (grub_fshelp_node_t node, | |
240 | void (*read_hook) (unsigned long sector, | |
241 | unsigned offset, unsigned length), | |
242 | int pos, unsigned int len, char *buf) | |
243 | { | |
244 | return grub_fshelp_read_file (node->data->disk, node, read_hook, | |
245 | pos, len, buf, grub_xfs_read_block, | |
246 | grub_be_to_cpu64 (node->inode.size), | |
247 | node->data->sblock.log2_bsize | |
248 | - GRUB_DISK_SECTOR_BITS); | |
249 | } | |
250 | ||
251 | ||
252 | static char * | |
253 | grub_xfs_read_symlink (grub_fshelp_node_t node) | |
254 | { | |
255 | int size = grub_be_to_cpu64 (node->inode.size); | |
256 | ||
257 | switch (node->inode.format) | |
258 | { | |
259 | case XFS_INODE_FORMAT_INO: | |
260 | return grub_strndup (node->inode.data.raw, size); | |
261 | ||
262 | case XFS_INODE_FORMAT_EXT: | |
263 | { | |
264 | char *symlink; | |
265 | grub_ssize_t numread; | |
266 | ||
267 | symlink = grub_malloc (size + 1); | |
268 | if (!symlink) | |
269 | return 0; | |
270 | ||
271 | numread = grub_xfs_read_file (node, 0, 0, size, symlink); | |
272 | if (numread != size) | |
273 | { | |
274 | grub_free (symlink); | |
275 | return 0; | |
276 | } | |
277 | symlink[size] = '\0'; | |
278 | return symlink; | |
279 | } | |
280 | } | |
281 | ||
282 | return 0; | |
283 | } | |
284 | ||
285 | ||
286 | static enum grub_fshelp_filetype | |
287 | grub_xfs_mode_to_filetype (grub_uint16_t mode) | |
288 | { | |
289 | if ((grub_be_to_cpu16 (mode) | |
290 | & FILETYPE_INO_MASK) == FILETYPE_INO_DIRECTORY) | |
291 | return GRUB_FSHELP_DIR; | |
292 | else if ((grub_be_to_cpu16 (mode) | |
293 | & FILETYPE_INO_MASK) == FILETYPE_INO_SYMLINK) | |
294 | return GRUB_FSHELP_SYMLINK; | |
295 | else if ((grub_be_to_cpu16 (mode) | |
296 | & FILETYPE_INO_MASK) == FILETYPE_INO_REG) | |
297 | return GRUB_FSHELP_REG; | |
298 | return GRUB_FSHELP_UNKNOWN; | |
299 | } | |
300 | ||
301 | ||
302 | static int | |
303 | grub_xfs_iterate_dir (grub_fshelp_node_t dir, | |
304 | int NESTED_FUNC_ATTR | |
305 | (*hook) (const char *filename, | |
306 | enum grub_fshelp_filetype filetype, | |
307 | grub_fshelp_node_t node)) | |
308 | { | |
309 | struct grub_fshelp_node *diro = (struct grub_fshelp_node *) dir; | |
b4093103 | 310 | auto int call_hook (grub_uint64_t ino, char *filename); |
b2499b29 | 311 | |
312 | int call_hook (grub_uint64_t ino, char *filename) | |
313 | { | |
314 | struct grub_fshelp_node *fdiro; | |
315 | ||
316 | fdiro = grub_malloc (sizeof (struct grub_fshelp_node)); | |
317 | if (!fdiro) | |
318 | return 0; | |
319 | ||
320 | /* The inode should be read, otherwise the filetype can | |
321 | not be determined. */ | |
322 | fdiro->ino = ino; | |
323 | fdiro->inode_read = 1; | |
324 | fdiro->data = diro->data; | |
325 | grub_xfs_read_inode (diro->data, ino, &fdiro->inode); | |
326 | ||
327 | return hook (filename, | |
328 | grub_xfs_mode_to_filetype (fdiro->inode.mode), | |
329 | fdiro); | |
330 | } | |
331 | ||
332 | switch (diro->inode.format) | |
333 | { | |
334 | case XFS_INODE_FORMAT_INO: | |
335 | { | |
336 | struct grub_xfs_dir_entry *de = &diro->inode.data.dir.direntry[0]; | |
337 | int smallino = !diro->inode.data.dir.dirhead.smallino; | |
338 | int i; | |
339 | grub_uint64_t parent; | |
340 | ||
341 | /* If small inode numbers are used to pack the direntry, the | |
342 | parent inode number is small too. */ | |
343 | if (smallino) | |
344 | { | |
345 | parent = grub_be_to_cpu32 (diro->inode.data.dir.dirhead.parent); | |
346 | parent = grub_cpu_to_be64 (parent); | |
347 | } | |
348 | else | |
349 | { | |
350 | parent = *(grub_uint64_t *) &diro->inode.data.dir.dirhead.parent; | |
351 | /* The header is a bit bigger than usual. */ | |
352 | de = (struct grub_xfs_dir_entry *) ((char *) de + 4); | |
353 | } | |
354 | ||
355 | /* Synthesize the direntries for `.' and `..'. */ | |
356 | if (call_hook (diro->ino, ".")) | |
357 | return 1; | |
358 | ||
359 | if (call_hook (parent, "..")) | |
360 | return 1; | |
361 | ||
362 | for (i = 0; i < diro->inode.data.dir.dirhead.entries; i++) | |
363 | { | |
364 | grub_uint64_t ino; | |
365 | void *inopos = (((char *) de) | |
688e5699 | 366 | + sizeof (struct grub_xfs_dir_entry) |
367 | + de->len - 1); | |
368 | char name[de->len + 1]; | |
369 | ||
b2499b29 | 370 | if (smallino) |
371 | { | |
372 | ino = grub_be_to_cpu32 (*(grub_uint32_t *) inopos); | |
373 | ino = grub_cpu_to_be64 (ino); | |
374 | } | |
375 | else | |
376 | ino = *(grub_uint64_t *) inopos; | |
377 | ||
688e5699 | 378 | grub_memcpy (name, de->name, de->len); |
379 | name[de->len] = '\0'; | |
380 | if (call_hook (ino, name)) | |
b2499b29 | 381 | return 1; |
382 | ||
383 | de = ((struct grub_xfs_dir_entry *) | |
384 | (((char *) de)+ sizeof (struct grub_xfs_dir_entry) + de->len | |
047b67e0 | 385 | + ((smallino ? sizeof (grub_uint32_t) |
386 | : sizeof (grub_uint64_t))) - 1)); | |
b2499b29 | 387 | } |
388 | break; | |
389 | } | |
390 | ||
391 | case XFS_INODE_FORMAT_BTREE: | |
392 | case XFS_INODE_FORMAT_EXT: | |
393 | { | |
394 | grub_ssize_t numread; | |
395 | char *dirblock; | |
688e5699 | 396 | grub_uint64_t blk; |
b2499b29 | 397 | |
398 | dirblock = grub_malloc (dir->data->bsize); | |
688e5699 | 399 | if (! dirblock) |
b2499b29 | 400 | return 0; |
401 | ||
402 | /* Iterate over every block the directory has. */ | |
403 | for (blk = 0; | |
404 | blk < (grub_be_to_cpu64 (dir->inode.size) | |
405 | >> dir->data->sblock.log2_bsize); | |
406 | blk++) | |
407 | { | |
408 | /* The header is skipped, the first direntry is stored | |
409 | from byte 16. */ | |
410 | int pos = 16; | |
411 | int entries; | |
412 | int tail_start = (dir->data->bsize | |
413 | - sizeof (struct grub_xfs_dirblock_tail)); | |
414 | ||
415 | struct grub_xfs_dirblock_tail *tail; | |
416 | tail = (struct grub_xfs_dirblock_tail *) &dirblock[tail_start]; | |
417 | ||
418 | numread = grub_xfs_read_file (dir, 0, | |
419 | blk << dir->data->sblock.log2_bsize, | |
420 | dir->data->bsize, dirblock); | |
6fa1251a | 421 | if (numread != dir->data->bsize) |
422 | return 0; | |
b2499b29 | 423 | |
424 | entries = (grub_be_to_cpu32 (tail->leaf_count) | |
425 | - grub_be_to_cpu32 (tail->leaf_stale)); | |
426 | ||
427 | /* Iterate over all entries within this block. */ | |
428 | while (pos < (dir->data->bsize | |
429 | - (int) sizeof (struct grub_xfs_dir2_entry))) | |
430 | { | |
431 | struct grub_xfs_dir2_entry *direntry; | |
432 | grub_uint16_t *freetag; | |
433 | char *filename; | |
434 | ||
435 | direntry = (struct grub_xfs_dir2_entry *) &dirblock[pos]; | |
436 | freetag = (grub_uint16_t *) direntry; | |
437 | ||
438 | if (*freetag == 0XFFFF) | |
439 | { | |
440 | grub_uint16_t *skip = (grub_uint16_t *) (freetag + 1); | |
441 | ||
442 | /* This entry is not used, go to the next one. */ | |
443 | pos += grub_be_to_cpu16 (*skip); | |
444 | ||
445 | continue; | |
446 | } | |
447 | ||
448 | filename = &dirblock[pos + sizeof (*direntry)]; | |
449 | /* The byte after the filename is for the tag, which | |
450 | is not used by GRUB. So it can be overwritten. */ | |
451 | filename[direntry->len] = '\0'; | |
452 | ||
453 | if (call_hook (direntry->inode, filename)) | |
454 | { | |
455 | grub_free (dirblock); | |
456 | return 1; | |
457 | } | |
458 | ||
459 | /* Check if last direntry in this block is | |
460 | reached. */ | |
461 | entries--; | |
462 | if (!entries) | |
463 | break; | |
464 | ||
465 | /* Select the next directory entry. */ | |
466 | pos = GRUB_XFS_NEXT_DIRENT (pos, direntry->len); | |
467 | pos = GRUB_XFS_ROUND_TO_DIRENT (pos); | |
468 | } | |
469 | } | |
470 | grub_free (dirblock); | |
471 | break; | |
472 | } | |
473 | ||
474 | default: | |
475 | grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET, | |
476 | "xfs does not support inode format %d yet", | |
477 | diro->inode.format); | |
478 | } | |
479 | return 0; | |
480 | } | |
481 | ||
482 | ||
483 | static struct grub_xfs_data * | |
484 | grub_xfs_mount (grub_disk_t disk) | |
485 | { | |
486 | struct grub_xfs_data *data = 0; | |
487 | ||
488 | data = grub_malloc (sizeof (struct grub_xfs_data)); | |
489 | if (!data) | |
490 | return 0; | |
491 | ||
492 | /* Read the superblock. */ | |
493 | if (grub_disk_read (disk, 0, 0, | |
494 | sizeof (struct grub_xfs_sblock), (char *) &data->sblock)) | |
495 | goto fail; | |
496 | ||
497 | if (grub_strncmp (data->sblock.magic, "XFSB", 4)) | |
498 | { | |
499 | grub_error (GRUB_ERR_BAD_FS, "not a xfs filesystem"); | |
500 | goto fail; | |
501 | } | |
502 | ||
503 | data->diropen.data = data; | |
504 | data->diropen.ino = data->sblock.rootino; | |
505 | data->diropen.inode_read = 1; | |
688e5699 | 506 | data->bsize = grub_be_to_cpu32 (data->sblock.bsize); |
507 | data->agsize = grub_be_to_cpu32 (data->sblock.agsize); | |
b2499b29 | 508 | |
509 | data->disk = disk; | |
510 | data->inode = &data->diropen.inode; | |
511 | data->pos = 0; | |
512 | ||
513 | grub_xfs_read_inode (data, data->diropen.ino, data->inode); | |
514 | ||
515 | return data; | |
516 | fail: | |
517 | ||
518 | grub_free (data); | |
519 | ||
520 | return 0; | |
521 | } | |
522 | ||
523 | \f | |
524 | static grub_err_t | |
525 | grub_xfs_dir (grub_device_t device, const char *path, | |
526 | int (*hook) (const char *filename, int dir)) | |
527 | { | |
528 | struct grub_xfs_data *data = 0;; | |
529 | struct grub_fshelp_node *fdiro = 0; | |
530 | ||
531 | auto int NESTED_FUNC_ATTR iterate (const char *filename, | |
532 | enum grub_fshelp_filetype filetype, | |
533 | grub_fshelp_node_t node); | |
534 | ||
535 | int NESTED_FUNC_ATTR iterate (const char *filename, | |
536 | enum grub_fshelp_filetype filetype, | |
537 | grub_fshelp_node_t node) | |
538 | { | |
539 | grub_free (node); | |
540 | ||
541 | if (filetype == GRUB_FSHELP_DIR) | |
542 | return hook (filename, 1); | |
543 | else | |
544 | return hook (filename, 0); | |
545 | ||
546 | return 0; | |
547 | } | |
548 | ||
549 | #ifndef GRUB_UTIL | |
550 | grub_dl_ref (my_mod); | |
551 | #endif | |
552 | ||
553 | data = grub_xfs_mount (device->disk); | |
554 | if (!data) | |
555 | goto fail; | |
556 | ||
557 | grub_fshelp_find_file (path, &data->diropen, &fdiro, grub_xfs_iterate_dir, | |
558 | grub_xfs_read_symlink, GRUB_FSHELP_DIR); | |
559 | if (grub_errno) | |
560 | goto fail; | |
561 | ||
562 | grub_xfs_iterate_dir (fdiro, iterate); | |
563 | ||
564 | fail: | |
565 | if (fdiro != &data->diropen) | |
566 | grub_free (fdiro); | |
567 | grub_free (data); | |
568 | ||
569 | #ifndef GRUB_UTIL | |
570 | grub_dl_unref (my_mod); | |
571 | #endif | |
572 | ||
573 | return grub_errno; | |
574 | ||
575 | return 0; | |
576 | } | |
577 | ||
578 | ||
579 | /* Open a file named NAME and initialize FILE. */ | |
580 | static grub_err_t | |
581 | grub_xfs_open (struct grub_file *file, const char *name) | |
582 | { | |
583 | struct grub_xfs_data *data; | |
584 | struct grub_fshelp_node *fdiro = 0; | |
585 | ||
586 | #ifndef GRUB_UTIL | |
587 | grub_dl_ref (my_mod); | |
588 | #endif | |
589 | ||
590 | data = grub_xfs_mount (file->device->disk); | |
591 | if (!data) | |
592 | goto fail; | |
593 | ||
594 | grub_fshelp_find_file (name, &data->diropen, &fdiro, grub_xfs_iterate_dir, | |
595 | grub_xfs_read_symlink, GRUB_FSHELP_REG); | |
596 | if (grub_errno) | |
597 | goto fail; | |
598 | ||
599 | if (!fdiro->inode_read) | |
600 | { | |
601 | grub_xfs_read_inode (data, fdiro->ino, &fdiro->inode); | |
602 | if (grub_errno) | |
603 | goto fail; | |
604 | } | |
605 | ||
606 | grub_memcpy (data->inode, | |
607 | &fdiro->inode, | |
608 | sizeof (struct grub_xfs_inode)); | |
609 | grub_free (fdiro); | |
610 | ||
611 | file->size = grub_be_to_cpu64 (data->inode->size); | |
612 | file->data = data; | |
613 | file->offset = 0; | |
614 | ||
615 | return 0; | |
616 | ||
617 | fail: | |
618 | if (fdiro != &data->diropen) | |
619 | grub_free (fdiro); | |
620 | grub_free (data); | |
621 | ||
622 | #ifndef GRUB_UTIL | |
623 | grub_dl_unref (my_mod); | |
624 | #endif | |
625 | ||
626 | return grub_errno; | |
627 | } | |
628 | ||
629 | ||
630 | static grub_ssize_t | |
631 | grub_xfs_read (grub_file_t file, char *buf, grub_ssize_t len) | |
632 | { | |
633 | struct grub_xfs_data *data = | |
634 | (struct grub_xfs_data *) file->data; | |
635 | ||
636 | return grub_xfs_read_file (&data->diropen, file->read_hook, | |
637 | file->offset, len, buf); | |
638 | } | |
639 | ||
640 | ||
641 | static grub_err_t | |
642 | grub_xfs_close (grub_file_t file) | |
643 | { | |
644 | grub_free (file->data); | |
645 | ||
646 | #ifndef GRUB_UTIL | |
647 | grub_dl_unref (my_mod); | |
648 | #endif | |
649 | ||
650 | return GRUB_ERR_NONE; | |
651 | } | |
652 | ||
653 | ||
654 | static grub_err_t | |
655 | grub_xfs_label (grub_device_t device, char **label) | |
656 | { | |
657 | struct grub_xfs_data *data; | |
658 | grub_disk_t disk = device->disk; | |
659 | ||
660 | #ifndef GRUB_UTIL | |
661 | grub_dl_ref (my_mod); | |
662 | #endif | |
663 | ||
664 | data = grub_xfs_mount (disk); | |
665 | if (data) | |
666 | *label = grub_strndup (data->sblock.label, 12); | |
667 | else | |
668 | *label = 0; | |
669 | ||
670 | #ifndef GRUB_UTIL | |
671 | grub_dl_unref (my_mod); | |
672 | #endif | |
673 | ||
674 | grub_free (data); | |
675 | ||
676 | return grub_errno; | |
677 | } | |
678 | ||
679 | \f | |
680 | ||
681 | static struct grub_fs grub_xfs_fs = | |
682 | { | |
683 | .name = "xfs", | |
684 | .dir = grub_xfs_dir, | |
685 | .open = grub_xfs_open, | |
686 | .read = grub_xfs_read, | |
687 | .close = grub_xfs_close, | |
688 | .label = grub_xfs_label, | |
689 | .next = 0 | |
690 | }; | |
691 | ||
6d099807 | 692 | GRUB_MOD_INIT(xfs) |
b2499b29 | 693 | { |
694 | grub_fs_register (&grub_xfs_fs); | |
6d099807 | 695 | #ifndef GRUB_UTIL |
b2499b29 | 696 | my_mod = mod; |
6d099807 | 697 | #endif |
b2499b29 | 698 | } |
699 | ||
6d099807 | 700 | GRUB_MOD_FINI(xfs) |
b2499b29 | 701 | { |
702 | grub_fs_unregister (&grub_xfs_fs); | |
703 | } | |
6d099807 | 704 |