blob: 7a1d5c94bb20dcc2f2d787a43aff48de7313742a
1 | /* vi: set sw=4 ts=4: */ |
2 | /* |
3 | * inode.c --- utility routines to read and write inodes |
4 | * |
5 | * Copyright (C) 1993, 1994, 1995, 1996, 1997 Theodore Ts'o. |
6 | * |
7 | * %Begin-Header% |
8 | * This file may be redistributed under the terms of the GNU Public |
9 | * License. |
10 | * %End-Header% |
11 | */ |
12 | |
13 | #include <stdio.h> |
14 | #include <string.h> |
15 | #if HAVE_UNISTD_H |
16 | #include <unistd.h> |
17 | #endif |
18 | #if HAVE_ERRNO_H |
19 | #include <errno.h> |
20 | #endif |
21 | #if HAVE_SYS_STAT_H |
22 | #include <sys/stat.h> |
23 | #endif |
24 | #if HAVE_SYS_TYPES_H |
25 | #include <sys/types.h> |
26 | #endif |
27 | |
28 | #include "ext2_fs.h" |
29 | #include "ext2fsP.h" |
30 | #include "e2image.h" |
31 | |
32 | struct ext2_struct_inode_scan { |
33 | errcode_t magic; |
34 | ext2_filsys fs; |
35 | ext2_ino_t current_inode; |
36 | blk_t current_block; |
37 | dgrp_t current_group; |
38 | ext2_ino_t inodes_left; |
39 | blk_t blocks_left; |
40 | dgrp_t groups_left; |
41 | blk_t inode_buffer_blocks; |
42 | char * inode_buffer; |
43 | int inode_size; |
44 | char * ptr; |
45 | int bytes_left; |
46 | char *temp_buffer; |
47 | errcode_t (*done_group)(ext2_filsys fs, |
48 | dgrp_t group, |
49 | void * priv_data); |
50 | void * done_group_data; |
51 | int bad_block_ptr; |
52 | int scan_flags; |
53 | int reserved[6]; |
54 | }; |
55 | |
56 | /* |
57 | * This routine flushes the icache, if it exists. |
58 | */ |
59 | errcode_t ext2fs_flush_icache(ext2_filsys fs) |
60 | { |
61 | int i; |
62 | |
63 | if (!fs->icache) |
64 | return 0; |
65 | |
66 | for (i=0; i < fs->icache->cache_size; i++) |
67 | fs->icache->cache[i].ino = 0; |
68 | |
69 | fs->icache->buffer_blk = 0; |
70 | return 0; |
71 | } |
72 | |
73 | static errcode_t create_icache(ext2_filsys fs) |
74 | { |
75 | errcode_t retval; |
76 | |
77 | if (fs->icache) |
78 | return 0; |
79 | retval = ext2fs_get_mem(sizeof(struct ext2_inode_cache), &fs->icache); |
80 | if (retval) |
81 | return retval; |
82 | |
83 | memset(fs->icache, 0, sizeof(struct ext2_inode_cache)); |
84 | retval = ext2fs_get_mem(fs->blocksize, &fs->icache->buffer); |
85 | if (retval) { |
86 | ext2fs_free_mem(&fs->icache); |
87 | return retval; |
88 | } |
89 | fs->icache->buffer_blk = 0; |
90 | fs->icache->cache_last = -1; |
91 | fs->icache->cache_size = 4; |
92 | fs->icache->refcount = 1; |
93 | retval = ext2fs_get_mem(sizeof(struct ext2_inode_cache_ent) |
94 | * fs->icache->cache_size, |
95 | &fs->icache->cache); |
96 | if (retval) { |
97 | ext2fs_free_mem(&fs->icache->buffer); |
98 | ext2fs_free_mem(&fs->icache); |
99 | return retval; |
100 | } |
101 | ext2fs_flush_icache(fs); |
102 | return 0; |
103 | } |
104 | |
105 | errcode_t ext2fs_open_inode_scan(ext2_filsys fs, int buffer_blocks, |
106 | ext2_inode_scan *ret_scan) |
107 | { |
108 | ext2_inode_scan scan; |
109 | errcode_t retval; |
110 | errcode_t (*save_get_blocks)(ext2_filsys f, ext2_ino_t ino, blk_t *blocks); |
111 | |
112 | EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS); |
113 | |
114 | /* |
115 | * If fs->badblocks isn't set, then set it --- since the inode |
116 | * scanning functions require it. |
117 | */ |
118 | if (fs->badblocks == 0) { |
119 | /* |
120 | * Temporarly save fs->get_blocks and set it to zero, |
121 | * for compatibility with old e2fsck's. |
122 | */ |
123 | save_get_blocks = fs->get_blocks; |
124 | fs->get_blocks = 0; |
125 | retval = ext2fs_read_bb_inode(fs, &fs->badblocks); |
126 | if (retval) { |
127 | ext2fs_badblocks_list_free(fs->badblocks); |
128 | fs->badblocks = 0; |
129 | } |
130 | fs->get_blocks = save_get_blocks; |
131 | } |
132 | |
133 | retval = ext2fs_get_mem(sizeof(struct ext2_struct_inode_scan), &scan); |
134 | if (retval) |
135 | return retval; |
136 | memset(scan, 0, sizeof(struct ext2_struct_inode_scan)); |
137 | |
138 | scan->magic = EXT2_ET_MAGIC_INODE_SCAN; |
139 | scan->fs = fs; |
140 | scan->inode_size = EXT2_INODE_SIZE(fs->super); |
141 | scan->bytes_left = 0; |
142 | scan->current_group = 0; |
143 | scan->groups_left = fs->group_desc_count - 1; |
144 | scan->inode_buffer_blocks = buffer_blocks ? buffer_blocks : 8; |
145 | scan->current_block = scan->fs-> |
146 | group_desc[scan->current_group].bg_inode_table; |
147 | scan->inodes_left = EXT2_INODES_PER_GROUP(scan->fs->super); |
148 | scan->blocks_left = scan->fs->inode_blocks_per_group; |
149 | retval = ext2fs_get_mem((size_t) (scan->inode_buffer_blocks * |
150 | fs->blocksize), |
151 | &scan->inode_buffer); |
152 | scan->done_group = 0; |
153 | scan->done_group_data = 0; |
154 | scan->bad_block_ptr = 0; |
155 | if (retval) { |
156 | ext2fs_free_mem(&scan); |
157 | return retval; |
158 | } |
159 | retval = ext2fs_get_mem(scan->inode_size, &scan->temp_buffer); |
160 | if (retval) { |
161 | ext2fs_free_mem(&scan->inode_buffer); |
162 | ext2fs_free_mem(&scan); |
163 | return retval; |
164 | } |
165 | if (scan->fs->badblocks && scan->fs->badblocks->num) |
166 | scan->scan_flags |= EXT2_SF_CHK_BADBLOCKS; |
167 | *ret_scan = scan; |
168 | return 0; |
169 | } |
170 | |
171 | void ext2fs_close_inode_scan(ext2_inode_scan scan) |
172 | { |
173 | if (!scan || (scan->magic != EXT2_ET_MAGIC_INODE_SCAN)) |
174 | return; |
175 | |
176 | ext2fs_free_mem(&scan->inode_buffer); |
177 | scan->inode_buffer = NULL; |
178 | ext2fs_free_mem(&scan->temp_buffer); |
179 | scan->temp_buffer = NULL; |
180 | ext2fs_free_mem(&scan); |
181 | } |
182 | |
183 | void ext2fs_set_inode_callback(ext2_inode_scan scan, |
184 | errcode_t (*done_group)(ext2_filsys fs, |
185 | dgrp_t group, |
186 | void * priv_data), |
187 | void *done_group_data) |
188 | { |
189 | if (!scan || (scan->magic != EXT2_ET_MAGIC_INODE_SCAN)) |
190 | return; |
191 | |
192 | scan->done_group = done_group; |
193 | scan->done_group_data = done_group_data; |
194 | } |
195 | |
196 | int ext2fs_inode_scan_flags(ext2_inode_scan scan, int set_flags, |
197 | int clear_flags) |
198 | { |
199 | int old_flags; |
200 | |
201 | if (!scan || (scan->magic != EXT2_ET_MAGIC_INODE_SCAN)) |
202 | return 0; |
203 | |
204 | old_flags = scan->scan_flags; |
205 | scan->scan_flags &= ~clear_flags; |
206 | scan->scan_flags |= set_flags; |
207 | return old_flags; |
208 | } |
209 | |
210 | /* |
211 | * This function is called by ext2fs_get_next_inode when it needs to |
212 | * get ready to read in a new blockgroup. |
213 | */ |
214 | static errcode_t get_next_blockgroup(ext2_inode_scan scan) |
215 | { |
216 | scan->current_group++; |
217 | scan->groups_left--; |
218 | |
219 | scan->current_block = scan->fs-> |
220 | group_desc[scan->current_group].bg_inode_table; |
221 | |
222 | scan->current_inode = scan->current_group * |
223 | EXT2_INODES_PER_GROUP(scan->fs->super); |
224 | |
225 | scan->bytes_left = 0; |
226 | scan->inodes_left = EXT2_INODES_PER_GROUP(scan->fs->super); |
227 | scan->blocks_left = scan->fs->inode_blocks_per_group; |
228 | return 0; |
229 | } |
230 | |
231 | errcode_t ext2fs_inode_scan_goto_blockgroup(ext2_inode_scan scan, |
232 | int group) |
233 | { |
234 | scan->current_group = group - 1; |
235 | scan->groups_left = scan->fs->group_desc_count - group; |
236 | return get_next_blockgroup(scan); |
237 | } |
238 | |
239 | /* |
240 | * This function is called by get_next_blocks() to check for bad |
241 | * blocks in the inode table. |
242 | * |
243 | * This function assumes that badblocks_list->list is sorted in |
244 | * increasing order. |
245 | */ |
246 | static errcode_t check_for_inode_bad_blocks(ext2_inode_scan scan, |
247 | blk_t *num_blocks) |
248 | { |
249 | blk_t blk = scan->current_block; |
250 | badblocks_list bb = scan->fs->badblocks; |
251 | |
252 | /* |
253 | * If the inode table is missing, then obviously there are no |
254 | * bad blocks. :-) |
255 | */ |
256 | if (blk == 0) |
257 | return 0; |
258 | |
259 | /* |
260 | * If the current block is greater than the bad block listed |
261 | * in the bad block list, then advance the pointer until this |
262 | * is no longer the case. If we run out of bad blocks, then |
263 | * we don't need to do any more checking! |
264 | */ |
265 | while (blk > bb->list[scan->bad_block_ptr]) { |
266 | if (++scan->bad_block_ptr >= bb->num) { |
267 | scan->scan_flags &= ~EXT2_SF_CHK_BADBLOCKS; |
268 | return 0; |
269 | } |
270 | } |
271 | |
272 | /* |
273 | * If the current block is equal to the bad block listed in |
274 | * the bad block list, then handle that one block specially. |
275 | * (We could try to handle runs of bad blocks, but that |
276 | * only increases CPU efficiency by a small amount, at the |
277 | * expense of a huge expense of code complexity, and for an |
278 | * uncommon case at that.) |
279 | */ |
280 | if (blk == bb->list[scan->bad_block_ptr]) { |
281 | scan->scan_flags |= EXT2_SF_BAD_INODE_BLK; |
282 | *num_blocks = 1; |
283 | if (++scan->bad_block_ptr >= bb->num) |
284 | scan->scan_flags &= ~EXT2_SF_CHK_BADBLOCKS; |
285 | return 0; |
286 | } |
287 | |
288 | /* |
289 | * If there is a bad block in the range that we're about to |
290 | * read in, adjust the number of blocks to read so that we we |
291 | * don't read in the bad block. (Then the next block to read |
292 | * will be the bad block, which is handled in the above case.) |
293 | */ |
294 | if ((blk + *num_blocks) > bb->list[scan->bad_block_ptr]) |
295 | *num_blocks = (int) (bb->list[scan->bad_block_ptr] - blk); |
296 | |
297 | return 0; |
298 | } |
299 | |
300 | /* |
301 | * This function is called by ext2fs_get_next_inode when it needs to |
302 | * read in more blocks from the current blockgroup's inode table. |
303 | */ |
304 | static errcode_t get_next_blocks(ext2_inode_scan scan) |
305 | { |
306 | blk_t num_blocks; |
307 | errcode_t retval; |
308 | |
309 | /* |
310 | * Figure out how many blocks to read; we read at most |
311 | * inode_buffer_blocks, and perhaps less if there aren't that |
312 | * many blocks left to read. |
313 | */ |
314 | num_blocks = scan->inode_buffer_blocks; |
315 | if (num_blocks > scan->blocks_left) |
316 | num_blocks = scan->blocks_left; |
317 | |
318 | /* |
319 | * If the past block "read" was a bad block, then mark the |
320 | * left-over extra bytes as also being bad. |
321 | */ |
322 | if (scan->scan_flags & EXT2_SF_BAD_INODE_BLK) { |
323 | if (scan->bytes_left) |
324 | scan->scan_flags |= EXT2_SF_BAD_EXTRA_BYTES; |
325 | scan->scan_flags &= ~EXT2_SF_BAD_INODE_BLK; |
326 | } |
327 | |
328 | /* |
329 | * Do inode bad block processing, if necessary. |
330 | */ |
331 | if (scan->scan_flags & EXT2_SF_CHK_BADBLOCKS) { |
332 | retval = check_for_inode_bad_blocks(scan, &num_blocks); |
333 | if (retval) |
334 | return retval; |
335 | } |
336 | |
337 | if ((scan->scan_flags & EXT2_SF_BAD_INODE_BLK) || |
338 | (scan->current_block == 0)) { |
339 | memset(scan->inode_buffer, 0, |
340 | (size_t) num_blocks * scan->fs->blocksize); |
341 | } else { |
342 | retval = io_channel_read_blk(scan->fs->io, |
343 | scan->current_block, |
344 | (int) num_blocks, |
345 | scan->inode_buffer); |
346 | if (retval) |
347 | return EXT2_ET_NEXT_INODE_READ; |
348 | } |
349 | scan->ptr = scan->inode_buffer; |
350 | scan->bytes_left = num_blocks * scan->fs->blocksize; |
351 | |
352 | scan->blocks_left -= num_blocks; |
353 | if (scan->current_block) |
354 | scan->current_block += num_blocks; |
355 | return 0; |
356 | } |
357 | |
358 | errcode_t ext2fs_get_next_inode_full(ext2_inode_scan scan, ext2_ino_t *ino, |
359 | struct ext2_inode *inode, int bufsize) |
360 | { |
361 | errcode_t retval; |
362 | int extra_bytes = 0; |
363 | |
364 | EXT2_CHECK_MAGIC(scan, EXT2_ET_MAGIC_INODE_SCAN); |
365 | |
366 | /* |
367 | * Do we need to start reading a new block group? |
368 | */ |
369 | if (scan->inodes_left <= 0) { |
370 | force_new_group: |
371 | if (scan->done_group) { |
372 | retval = (scan->done_group) |
373 | (scan->fs, scan->current_group, |
374 | scan->done_group_data); |
375 | if (retval) |
376 | return retval; |
377 | } |
378 | if (scan->groups_left <= 0) { |
379 | *ino = 0; |
380 | return 0; |
381 | } |
382 | retval = get_next_blockgroup(scan); |
383 | if (retval) |
384 | return retval; |
385 | } |
386 | /* |
387 | * This is done outside the above if statement so that the |
388 | * check can be done for block group #0. |
389 | */ |
390 | if (scan->current_block == 0) { |
391 | if (scan->scan_flags & EXT2_SF_SKIP_MISSING_ITABLE) { |
392 | goto force_new_group; |
393 | } else |
394 | return EXT2_ET_MISSING_INODE_TABLE; |
395 | } |
396 | |
397 | |
398 | /* |
399 | * Have we run out of space in the inode buffer? If so, we |
400 | * need to read in more blocks. |
401 | */ |
402 | if (scan->bytes_left < scan->inode_size) { |
403 | memcpy(scan->temp_buffer, scan->ptr, scan->bytes_left); |
404 | extra_bytes = scan->bytes_left; |
405 | |
406 | retval = get_next_blocks(scan); |
407 | if (retval) |
408 | return retval; |
409 | #if 0 |
410 | /* |
411 | * XXX test Need check for used inode somehow. |
412 | * (Note: this is hard.) |
413 | */ |
414 | if (is_empty_scan(scan)) |
415 | goto force_new_group; |
416 | #endif |
417 | } |
418 | |
419 | retval = 0; |
420 | if (extra_bytes) { |
421 | memcpy(scan->temp_buffer+extra_bytes, scan->ptr, |
422 | scan->inode_size - extra_bytes); |
423 | scan->ptr += scan->inode_size - extra_bytes; |
424 | scan->bytes_left -= scan->inode_size - extra_bytes; |
425 | |
426 | #if BB_BIG_ENDIAN |
427 | if ((scan->fs->flags & EXT2_FLAG_SWAP_BYTES) || |
428 | (scan->fs->flags & EXT2_FLAG_SWAP_BYTES_READ)) |
429 | ext2fs_swap_inode_full(scan->fs, |
430 | (struct ext2_inode_large *) inode, |
431 | (struct ext2_inode_large *) scan->temp_buffer, |
432 | 0, bufsize); |
433 | else |
434 | #endif |
435 | *inode = *((struct ext2_inode *) scan->temp_buffer); |
436 | if (scan->scan_flags & EXT2_SF_BAD_EXTRA_BYTES) |
437 | retval = EXT2_ET_BAD_BLOCK_IN_INODE_TABLE; |
438 | scan->scan_flags &= ~EXT2_SF_BAD_EXTRA_BYTES; |
439 | } else { |
440 | #if BB_BIG_ENDIAN |
441 | if ((scan->fs->flags & EXT2_FLAG_SWAP_BYTES) || |
442 | (scan->fs->flags & EXT2_FLAG_SWAP_BYTES_READ)) |
443 | ext2fs_swap_inode_full(scan->fs, |
444 | (struct ext2_inode_large *) inode, |
445 | (struct ext2_inode_large *) scan->ptr, |
446 | 0, bufsize); |
447 | else |
448 | #endif |
449 | memcpy(inode, scan->ptr, bufsize); |
450 | scan->ptr += scan->inode_size; |
451 | scan->bytes_left -= scan->inode_size; |
452 | if (scan->scan_flags & EXT2_SF_BAD_INODE_BLK) |
453 | retval = EXT2_ET_BAD_BLOCK_IN_INODE_TABLE; |
454 | } |
455 | |
456 | scan->inodes_left--; |
457 | scan->current_inode++; |
458 | *ino = scan->current_inode; |
459 | return retval; |
460 | } |
461 | |
462 | errcode_t ext2fs_get_next_inode(ext2_inode_scan scan, ext2_ino_t *ino, |
463 | struct ext2_inode *inode) |
464 | { |
465 | return ext2fs_get_next_inode_full(scan, ino, inode, |
466 | sizeof(struct ext2_inode)); |
467 | } |
468 | |
469 | /* |
470 | * Functions to read and write a single inode. |
471 | */ |
472 | errcode_t ext2fs_read_inode_full(ext2_filsys fs, ext2_ino_t ino, |
473 | struct ext2_inode * inode, int bufsize) |
474 | { |
475 | unsigned long group, block, block_nr, offset; |
476 | char *ptr; |
477 | errcode_t retval; |
478 | int clen, i, inodes_per_block, length; |
479 | io_channel io; |
480 | |
481 | EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS); |
482 | |
483 | /* Check to see if user has an override function */ |
484 | if (fs->read_inode) { |
485 | retval = (fs->read_inode)(fs, ino, inode); |
486 | if (retval != EXT2_ET_CALLBACK_NOTHANDLED) |
487 | return retval; |
488 | } |
489 | /* Create inode cache if not present */ |
490 | if (!fs->icache) { |
491 | retval = create_icache(fs); |
492 | if (retval) |
493 | return retval; |
494 | } |
495 | /* Check to see if it's in the inode cache */ |
496 | if (bufsize == sizeof(struct ext2_inode)) { |
497 | /* only old good inode can be retrieve from the cache */ |
498 | for (i=0; i < fs->icache->cache_size; i++) { |
499 | if (fs->icache->cache[i].ino == ino) { |
500 | *inode = fs->icache->cache[i].inode; |
501 | return 0; |
502 | } |
503 | } |
504 | } |
505 | if ((ino == 0) || (ino > fs->super->s_inodes_count)) |
506 | return EXT2_ET_BAD_INODE_NUM; |
507 | if (fs->flags & EXT2_FLAG_IMAGE_FILE) { |
508 | inodes_per_block = fs->blocksize / EXT2_INODE_SIZE(fs->super); |
509 | block_nr = fs->image_header->offset_inode / fs->blocksize; |
510 | block_nr += (ino - 1) / inodes_per_block; |
511 | offset = ((ino - 1) % inodes_per_block) * |
512 | EXT2_INODE_SIZE(fs->super); |
513 | io = fs->image_io; |
514 | } else { |
515 | group = (ino - 1) / EXT2_INODES_PER_GROUP(fs->super); |
516 | offset = ((ino - 1) % EXT2_INODES_PER_GROUP(fs->super)) * |
517 | EXT2_INODE_SIZE(fs->super); |
518 | block = offset >> EXT2_BLOCK_SIZE_BITS(fs->super); |
519 | if (!fs->group_desc[(unsigned)group].bg_inode_table) |
520 | return EXT2_ET_MISSING_INODE_TABLE; |
521 | block_nr = fs->group_desc[(unsigned)group].bg_inode_table + |
522 | block; |
523 | io = fs->io; |
524 | } |
525 | offset &= (EXT2_BLOCK_SIZE(fs->super) - 1); |
526 | |
527 | length = EXT2_INODE_SIZE(fs->super); |
528 | if (bufsize < length) |
529 | length = bufsize; |
530 | |
531 | ptr = (char *) inode; |
532 | while (length) { |
533 | clen = length; |
534 | if ((offset + length) > fs->blocksize) |
535 | clen = fs->blocksize - offset; |
536 | |
537 | if (block_nr != fs->icache->buffer_blk) { |
538 | retval = io_channel_read_blk(io, block_nr, 1, |
539 | fs->icache->buffer); |
540 | if (retval) |
541 | return retval; |
542 | fs->icache->buffer_blk = block_nr; |
543 | } |
544 | |
545 | memcpy(ptr, ((char *) fs->icache->buffer) + (unsigned) offset, |
546 | clen); |
547 | |
548 | offset = 0; |
549 | length -= clen; |
550 | ptr += clen; |
551 | block_nr++; |
552 | } |
553 | |
554 | #if BB_BIG_ENDIAN |
555 | if ((fs->flags & EXT2_FLAG_SWAP_BYTES) || |
556 | (fs->flags & EXT2_FLAG_SWAP_BYTES_READ)) |
557 | ext2fs_swap_inode_full(fs, (struct ext2_inode_large *) inode, |
558 | (struct ext2_inode_large *) inode, |
559 | 0, length); |
560 | #endif |
561 | |
562 | /* Update the inode cache */ |
563 | fs->icache->cache_last = (fs->icache->cache_last + 1) % |
564 | fs->icache->cache_size; |
565 | fs->icache->cache[fs->icache->cache_last].ino = ino; |
566 | fs->icache->cache[fs->icache->cache_last].inode = *inode; |
567 | |
568 | return 0; |
569 | } |
570 | |
571 | errcode_t ext2fs_read_inode(ext2_filsys fs, ext2_ino_t ino, |
572 | struct ext2_inode * inode) |
573 | { |
574 | return ext2fs_read_inode_full(fs, ino, inode, |
575 | sizeof(struct ext2_inode)); |
576 | } |
577 | |
578 | errcode_t ext2fs_write_inode_full(ext2_filsys fs, ext2_ino_t ino, |
579 | struct ext2_inode * inode, int bufsize) |
580 | { |
581 | unsigned long group, block, block_nr, offset; |
582 | errcode_t retval = 0; |
583 | struct ext2_inode_large temp_inode, *w_inode; |
584 | char *ptr; |
585 | int clen, i, length; |
586 | |
587 | EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS); |
588 | |
589 | /* Check to see if user provided an override function */ |
590 | if (fs->write_inode) { |
591 | retval = (fs->write_inode)(fs, ino, inode); |
592 | if (retval != EXT2_ET_CALLBACK_NOTHANDLED) |
593 | return retval; |
594 | } |
595 | |
596 | /* Check to see if the inode cache needs to be updated */ |
597 | if (fs->icache) { |
598 | for (i=0; i < fs->icache->cache_size; i++) { |
599 | if (fs->icache->cache[i].ino == ino) { |
600 | fs->icache->cache[i].inode = *inode; |
601 | break; |
602 | } |
603 | } |
604 | } else { |
605 | retval = create_icache(fs); |
606 | if (retval) |
607 | return retval; |
608 | } |
609 | |
610 | if (!(fs->flags & EXT2_FLAG_RW)) |
611 | return EXT2_ET_RO_FILSYS; |
612 | |
613 | if ((ino == 0) || (ino > fs->super->s_inodes_count)) |
614 | return EXT2_ET_BAD_INODE_NUM; |
615 | |
616 | length = bufsize; |
617 | if (length < EXT2_INODE_SIZE(fs->super)) |
618 | length = EXT2_INODE_SIZE(fs->super); |
619 | |
620 | if (length > (int) sizeof(struct ext2_inode_large)) { |
621 | w_inode = xmalloc(length); |
622 | } else |
623 | w_inode = &temp_inode; |
624 | memset(w_inode, 0, length); |
625 | |
626 | #if BB_BIG_ENDIAN |
627 | if ((fs->flags & EXT2_FLAG_SWAP_BYTES) || |
628 | (fs->flags & EXT2_FLAG_SWAP_BYTES_WRITE)) |
629 | ext2fs_swap_inode_full(fs, w_inode, |
630 | (struct ext2_inode_large *) inode, |
631 | 1, bufsize); |
632 | else |
633 | #endif |
634 | memcpy(w_inode, inode, bufsize); |
635 | |
636 | group = (ino - 1) / EXT2_INODES_PER_GROUP(fs->super); |
637 | offset = ((ino - 1) % EXT2_INODES_PER_GROUP(fs->super)) * |
638 | EXT2_INODE_SIZE(fs->super); |
639 | block = offset >> EXT2_BLOCK_SIZE_BITS(fs->super); |
640 | if (!fs->group_desc[(unsigned) group].bg_inode_table) |
641 | return EXT2_ET_MISSING_INODE_TABLE; |
642 | block_nr = fs->group_desc[(unsigned) group].bg_inode_table + block; |
643 | |
644 | offset &= (EXT2_BLOCK_SIZE(fs->super) - 1); |
645 | |
646 | length = EXT2_INODE_SIZE(fs->super); |
647 | if (length > bufsize) |
648 | length = bufsize; |
649 | |
650 | ptr = (char *) w_inode; |
651 | |
652 | while (length) { |
653 | clen = length; |
654 | if ((offset + length) > fs->blocksize) |
655 | clen = fs->blocksize - offset; |
656 | |
657 | if (fs->icache->buffer_blk != block_nr) { |
658 | retval = io_channel_read_blk(fs->io, block_nr, 1, |
659 | fs->icache->buffer); |
660 | if (retval) |
661 | goto errout; |
662 | fs->icache->buffer_blk = block_nr; |
663 | } |
664 | |
665 | |
666 | memcpy((char *) fs->icache->buffer + (unsigned) offset, |
667 | ptr, clen); |
668 | |
669 | retval = io_channel_write_blk(fs->io, block_nr, 1, |
670 | fs->icache->buffer); |
671 | if (retval) |
672 | goto errout; |
673 | |
674 | offset = 0; |
675 | ptr += clen; |
676 | length -= clen; |
677 | block_nr++; |
678 | } |
679 | |
680 | fs->flags |= EXT2_FLAG_CHANGED; |
681 | errout: |
682 | if (w_inode && w_inode != &temp_inode) |
683 | free(w_inode); |
684 | return retval; |
685 | } |
686 | |
687 | errcode_t ext2fs_write_inode(ext2_filsys fs, ext2_ino_t ino, |
688 | struct ext2_inode *inode) |
689 | { |
690 | return ext2fs_write_inode_full(fs, ino, inode, |
691 | sizeof(struct ext2_inode)); |
692 | } |
693 | |
694 | /* |
695 | * This function should be called when writing a new inode. It makes |
696 | * sure that extra part of large inodes is initialized properly. |
697 | */ |
698 | errcode_t ext2fs_write_new_inode(ext2_filsys fs, ext2_ino_t ino, |
699 | struct ext2_inode *inode) |
700 | { |
701 | struct ext2_inode *buf; |
702 | int size = EXT2_INODE_SIZE(fs->super); |
703 | struct ext2_inode_large *large_inode; |
704 | |
705 | if (size == sizeof(struct ext2_inode)) |
706 | return ext2fs_write_inode_full(fs, ino, inode, |
707 | sizeof(struct ext2_inode)); |
708 | |
709 | buf = xmalloc(size); |
710 | |
711 | memset(buf, 0, size); |
712 | *buf = *inode; |
713 | |
714 | large_inode = (struct ext2_inode_large *) buf; |
715 | large_inode->i_extra_isize = sizeof(struct ext2_inode_large) - |
716 | EXT2_GOOD_OLD_INODE_SIZE; |
717 | |
718 | return ext2fs_write_inode_full(fs, ino, buf, size); |
719 | } |
720 | |
721 | |
722 | errcode_t ext2fs_get_blocks(ext2_filsys fs, ext2_ino_t ino, blk_t *blocks) |
723 | { |
724 | struct ext2_inode inode; |
725 | int i; |
726 | errcode_t retval; |
727 | |
728 | EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS); |
729 | |
730 | if (ino > fs->super->s_inodes_count) |
731 | return EXT2_ET_BAD_INODE_NUM; |
732 | |
733 | if (fs->get_blocks) { |
734 | if (!(*fs->get_blocks)(fs, ino, blocks)) |
735 | return 0; |
736 | } |
737 | retval = ext2fs_read_inode(fs, ino, &inode); |
738 | if (retval) |
739 | return retval; |
740 | for (i=0; i < EXT2_N_BLOCKS; i++) |
741 | blocks[i] = inode.i_block[i]; |
742 | return 0; |
743 | } |
744 | |
745 | errcode_t ext2fs_check_directory(ext2_filsys fs, ext2_ino_t ino) |
746 | { |
747 | struct ext2_inode inode; |
748 | errcode_t retval; |
749 | |
750 | EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS); |
751 | |
752 | if (ino > fs->super->s_inodes_count) |
753 | return EXT2_ET_BAD_INODE_NUM; |
754 | |
755 | if (fs->check_directory) { |
756 | retval = (fs->check_directory)(fs, ino); |
757 | if (retval != EXT2_ET_CALLBACK_NOTHANDLED) |
758 | return retval; |
759 | } |
760 | retval = ext2fs_read_inode(fs, ino, &inode); |
761 | if (retval) |
762 | return retval; |
763 | if (!LINUX_S_ISDIR(inode.i_mode)) |
764 | return EXT2_ET_NO_DIRECTORY; |
765 | return 0; |
766 | } |
767 |