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-rw-r--r--e2fsprogs/ext2fs/inode.c794
1 files changed, 794 insertions, 0 deletions
diff --git a/e2fsprogs/ext2fs/inode.c b/e2fsprogs/ext2fs/inode.c
new file mode 100644
index 000000000..222568ebe
--- /dev/null
+++ b/e2fsprogs/ext2fs/inode.c
@@ -0,0 +1,794 @@
1/*
2 * inode.c --- utility routines to read and write inodes
3 *
4 * Copyright (C) 1993, 1994, 1995, 1996, 1997 Theodore Ts'o.
5 *
6 * %Begin-Header%
7 * This file may be redistributed under the terms of the GNU Public
8 * License.
9 * %End-Header%
10 */
11
12#include <stdio.h>
13#include <string.h>
14#if HAVE_UNISTD_H
15#include <unistd.h>
16#endif
17#if HAVE_ERRNO_H
18#include <errno.h>
19#endif
20#if HAVE_SYS_STAT_H
21#include <sys/stat.h>
22#endif
23#if HAVE_SYS_TYPES_H
24#include <sys/types.h>
25#endif
26
27#include "ext2_fs.h"
28#include "ext2fsP.h"
29#include "e2image.h"
30
31struct ext2_struct_inode_scan {
32 errcode_t magic;
33 ext2_filsys fs;
34 ext2_ino_t current_inode;
35 blk_t current_block;
36 dgrp_t current_group;
37 ext2_ino_t inodes_left;
38 blk_t blocks_left;
39 dgrp_t groups_left;
40 blk_t inode_buffer_blocks;
41 char * inode_buffer;
42 int inode_size;
43 char * ptr;
44 int bytes_left;
45 char *temp_buffer;
46 errcode_t (*done_group)(ext2_filsys fs,
47 ext2_inode_scan scan,
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 */
59errcode_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
73static 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
105errcode_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 && fs->badblocks) {
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
171void 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 return;
182}
183
184void ext2fs_set_inode_callback(ext2_inode_scan scan,
185 errcode_t (*done_group)(ext2_filsys fs,
186 ext2_inode_scan scan,
187 dgrp_t group,
188 void * priv_data),
189 void *done_group_data)
190{
191 if (!scan || (scan->magic != EXT2_ET_MAGIC_INODE_SCAN))
192 return;
193
194 scan->done_group = done_group;
195 scan->done_group_data = done_group_data;
196}
197
198int ext2fs_inode_scan_flags(ext2_inode_scan scan, int set_flags,
199 int clear_flags)
200{
201 int old_flags;
202
203 if (!scan || (scan->magic != EXT2_ET_MAGIC_INODE_SCAN))
204 return 0;
205
206 old_flags = scan->scan_flags;
207 scan->scan_flags &= ~clear_flags;
208 scan->scan_flags |= set_flags;
209 return old_flags;
210}
211
212/*
213 * This function is called by ext2fs_get_next_inode when it needs to
214 * get ready to read in a new blockgroup.
215 */
216static errcode_t get_next_blockgroup(ext2_inode_scan scan)
217{
218 scan->current_group++;
219 scan->groups_left--;
220
221 scan->current_block = scan->fs->
222 group_desc[scan->current_group].bg_inode_table;
223
224 scan->current_inode = scan->current_group *
225 EXT2_INODES_PER_GROUP(scan->fs->super);
226
227 scan->bytes_left = 0;
228 scan->inodes_left = EXT2_INODES_PER_GROUP(scan->fs->super);
229 scan->blocks_left = scan->fs->inode_blocks_per_group;
230 return 0;
231}
232
233errcode_t ext2fs_inode_scan_goto_blockgroup(ext2_inode_scan scan,
234 int group)
235{
236 scan->current_group = group - 1;
237 scan->groups_left = scan->fs->group_desc_count - group;
238 return get_next_blockgroup(scan);
239}
240
241/*
242 * This function is called by get_next_blocks() to check for bad
243 * blocks in the inode table.
244 *
245 * This function assumes that badblocks_list->list is sorted in
246 * increasing order.
247 */
248static errcode_t check_for_inode_bad_blocks(ext2_inode_scan scan,
249 blk_t *num_blocks)
250{
251 blk_t blk = scan->current_block;
252 badblocks_list bb = scan->fs->badblocks;
253
254 /*
255 * If the inode table is missing, then obviously there are no
256 * bad blocks. :-)
257 */
258 if (blk == 0)
259 return 0;
260
261 /*
262 * If the current block is greater than the bad block listed
263 * in the bad block list, then advance the pointer until this
264 * is no longer the case. If we run out of bad blocks, then
265 * we don't need to do any more checking!
266 */
267 while (blk > bb->list[scan->bad_block_ptr]) {
268 if (++scan->bad_block_ptr >= bb->num) {
269 scan->scan_flags &= ~EXT2_SF_CHK_BADBLOCKS;
270 return 0;
271 }
272 }
273
274 /*
275 * If the current block is equal to the bad block listed in
276 * the bad block list, then handle that one block specially.
277 * (We could try to handle runs of bad blocks, but that
278 * only increases CPU efficiency by a small amount, at the
279 * expense of a huge expense of code complexity, and for an
280 * uncommon case at that.)
281 */
282 if (blk == bb->list[scan->bad_block_ptr]) {
283 scan->scan_flags |= EXT2_SF_BAD_INODE_BLK;
284 *num_blocks = 1;
285 if (++scan->bad_block_ptr >= bb->num)
286 scan->scan_flags &= ~EXT2_SF_CHK_BADBLOCKS;
287 return 0;
288 }
289
290 /*
291 * If there is a bad block in the range that we're about to
292 * read in, adjust the number of blocks to read so that we we
293 * don't read in the bad block. (Then the next block to read
294 * will be the bad block, which is handled in the above case.)
295 */
296 if ((blk + *num_blocks) > bb->list[scan->bad_block_ptr])
297 *num_blocks = (int) (bb->list[scan->bad_block_ptr] - blk);
298
299 return 0;
300}
301
302/*
303 * This function is called by ext2fs_get_next_inode when it needs to
304 * read in more blocks from the current blockgroup's inode table.
305 */
306static errcode_t get_next_blocks(ext2_inode_scan scan)
307{
308 blk_t num_blocks;
309 errcode_t retval;
310
311 /*
312 * Figure out how many blocks to read; we read at most
313 * inode_buffer_blocks, and perhaps less if there aren't that
314 * many blocks left to read.
315 */
316 num_blocks = scan->inode_buffer_blocks;
317 if (num_blocks > scan->blocks_left)
318 num_blocks = scan->blocks_left;
319
320 /*
321 * If the past block "read" was a bad block, then mark the
322 * left-over extra bytes as also being bad.
323 */
324 if (scan->scan_flags & EXT2_SF_BAD_INODE_BLK) {
325 if (scan->bytes_left)
326 scan->scan_flags |= EXT2_SF_BAD_EXTRA_BYTES;
327 scan->scan_flags &= ~EXT2_SF_BAD_INODE_BLK;
328 }
329
330 /*
331 * Do inode bad block processing, if necessary.
332 */
333 if (scan->scan_flags & EXT2_SF_CHK_BADBLOCKS) {
334 retval = check_for_inode_bad_blocks(scan, &num_blocks);
335 if (retval)
336 return retval;
337 }
338
339 if ((scan->scan_flags & EXT2_SF_BAD_INODE_BLK) ||
340 (scan->current_block == 0)) {
341 memset(scan->inode_buffer, 0,
342 (size_t) num_blocks * scan->fs->blocksize);
343 } else {
344 retval = io_channel_read_blk(scan->fs->io,
345 scan->current_block,
346 (int) num_blocks,
347 scan->inode_buffer);
348 if (retval)
349 return EXT2_ET_NEXT_INODE_READ;
350 }
351 scan->ptr = scan->inode_buffer;
352 scan->bytes_left = num_blocks * scan->fs->blocksize;
353
354 scan->blocks_left -= num_blocks;
355 if (scan->current_block)
356 scan->current_block += num_blocks;
357 return 0;
358}
359
360#if 0
361/*
362 * Returns 1 if the entire inode_buffer has a non-zero size and
363 * contains all zeros. (Not just deleted inodes, since that means
364 * that part of the inode table was used at one point; we want all
365 * zeros, which means that the inode table is pristine.)
366 */
367static inline int is_empty_scan(ext2_inode_scan scan)
368{
369 int i;
370
371 if (scan->bytes_left == 0)
372 return 0;
373
374 for (i=0; i < scan->bytes_left; i++)
375 if (scan->ptr[i])
376 return 0;
377 return 1;
378}
379#endif
380
381errcode_t ext2fs_get_next_inode_full(ext2_inode_scan scan, ext2_ino_t *ino,
382 struct ext2_inode *inode, int bufsize)
383{
384 errcode_t retval;
385 int extra_bytes = 0;
386
387 EXT2_CHECK_MAGIC(scan, EXT2_ET_MAGIC_INODE_SCAN);
388
389 /*
390 * Do we need to start reading a new block group?
391 */
392 if (scan->inodes_left <= 0) {
393 force_new_group:
394 if (scan->done_group) {
395 retval = (scan->done_group)
396 (scan->fs, scan, scan->current_group,
397 scan->done_group_data);
398 if (retval)
399 return retval;
400 }
401 if (scan->groups_left <= 0) {
402 *ino = 0;
403 return 0;
404 }
405 retval = get_next_blockgroup(scan);
406 if (retval)
407 return retval;
408 }
409 /*
410 * This is done outside the above if statement so that the
411 * check can be done for block group #0.
412 */
413 if (scan->current_block == 0) {
414 if (scan->scan_flags & EXT2_SF_SKIP_MISSING_ITABLE) {
415 goto force_new_group;
416 } else
417 return EXT2_ET_MISSING_INODE_TABLE;
418 }
419
420
421 /*
422 * Have we run out of space in the inode buffer? If so, we
423 * need to read in more blocks.
424 */
425 if (scan->bytes_left < scan->inode_size) {
426 memcpy(scan->temp_buffer, scan->ptr, scan->bytes_left);
427 extra_bytes = scan->bytes_left;
428
429 retval = get_next_blocks(scan);
430 if (retval)
431 return retval;
432#if 0
433 /*
434 * XXX test Need check for used inode somehow.
435 * (Note: this is hard.)
436 */
437 if (is_empty_scan(scan))
438 goto force_new_group;
439#endif
440 }
441
442 retval = 0;
443 if (extra_bytes) {
444 memcpy(scan->temp_buffer+extra_bytes, scan->ptr,
445 scan->inode_size - extra_bytes);
446 scan->ptr += scan->inode_size - extra_bytes;
447 scan->bytes_left -= scan->inode_size - extra_bytes;
448
449#ifdef EXT2FS_ENABLE_SWAPFS
450 if ((scan->fs->flags & EXT2_FLAG_SWAP_BYTES) ||
451 (scan->fs->flags & EXT2_FLAG_SWAP_BYTES_READ))
452 ext2fs_swap_inode_full(scan->fs,
453 (struct ext2_inode_large *) inode,
454 (struct ext2_inode_large *) scan->temp_buffer,
455 0, bufsize);
456 else
457#endif
458 *inode = *((struct ext2_inode *) scan->temp_buffer);
459 if (scan->scan_flags & EXT2_SF_BAD_EXTRA_BYTES)
460 retval = EXT2_ET_BAD_BLOCK_IN_INODE_TABLE;
461 scan->scan_flags &= ~EXT2_SF_BAD_EXTRA_BYTES;
462 } else {
463#ifdef EXT2FS_ENABLE_SWAPFS
464 if ((scan->fs->flags & EXT2_FLAG_SWAP_BYTES) ||
465 (scan->fs->flags & EXT2_FLAG_SWAP_BYTES_READ))
466 ext2fs_swap_inode_full(scan->fs,
467 (struct ext2_inode_large *) inode,
468 (struct ext2_inode_large *) scan->ptr,
469 0, bufsize);
470 else
471#endif
472 memcpy(inode, scan->ptr, bufsize);
473 scan->ptr += scan->inode_size;
474 scan->bytes_left -= scan->inode_size;
475 if (scan->scan_flags & EXT2_SF_BAD_INODE_BLK)
476 retval = EXT2_ET_BAD_BLOCK_IN_INODE_TABLE;
477 }
478
479 scan->inodes_left--;
480 scan->current_inode++;
481 *ino = scan->current_inode;
482 return retval;
483}
484
485errcode_t ext2fs_get_next_inode(ext2_inode_scan scan, ext2_ino_t *ino,
486 struct ext2_inode *inode)
487{
488 return ext2fs_get_next_inode_full(scan, ino, inode,
489 sizeof(struct ext2_inode));
490}
491
492/*
493 * Functions to read and write a single inode.
494 */
495errcode_t ext2fs_read_inode_full(ext2_filsys fs, ext2_ino_t ino,
496 struct ext2_inode * inode, int bufsize)
497{
498 unsigned long group, block, block_nr, offset;
499 char *ptr;
500 errcode_t retval;
501 int clen, i, inodes_per_block, length;
502 io_channel io;
503
504 EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
505
506 /* Check to see if user has an override function */
507 if (fs->read_inode) {
508 retval = (fs->read_inode)(fs, ino, inode);
509 if (retval != EXT2_ET_CALLBACK_NOTHANDLED)
510 return retval;
511 }
512 /* Create inode cache if not present */
513 if (!fs->icache) {
514 retval = create_icache(fs);
515 if (retval)
516 return retval;
517 }
518 /* Check to see if it's in the inode cache */
519 if (bufsize == sizeof(struct ext2_inode)) {
520 /* only old good inode can be retrieve from the cache */
521 for (i=0; i < fs->icache->cache_size; i++) {
522 if (fs->icache->cache[i].ino == ino) {
523 *inode = fs->icache->cache[i].inode;
524 return 0;
525 }
526 }
527 }
528 if ((ino == 0) || (ino > fs->super->s_inodes_count))
529 return EXT2_ET_BAD_INODE_NUM;
530 if (fs->flags & EXT2_FLAG_IMAGE_FILE) {
531 inodes_per_block = fs->blocksize / EXT2_INODE_SIZE(fs->super);
532 block_nr = fs->image_header->offset_inode / fs->blocksize;
533 block_nr += (ino - 1) / inodes_per_block;
534 offset = ((ino - 1) % inodes_per_block) *
535 EXT2_INODE_SIZE(fs->super);
536 io = fs->image_io;
537 } else {
538 group = (ino - 1) / EXT2_INODES_PER_GROUP(fs->super);
539 offset = ((ino - 1) % EXT2_INODES_PER_GROUP(fs->super)) *
540 EXT2_INODE_SIZE(fs->super);
541 block = offset >> EXT2_BLOCK_SIZE_BITS(fs->super);
542 if (!fs->group_desc[(unsigned)group].bg_inode_table)
543 return EXT2_ET_MISSING_INODE_TABLE;
544 block_nr = fs->group_desc[(unsigned)group].bg_inode_table +
545 block;
546 io = fs->io;
547 }
548 offset &= (EXT2_BLOCK_SIZE(fs->super) - 1);
549
550 length = EXT2_INODE_SIZE(fs->super);
551 if (bufsize < length)
552 length = bufsize;
553
554 ptr = (char *) inode;
555 while (length) {
556 clen = length;
557 if ((offset + length) > fs->blocksize)
558 clen = fs->blocksize - offset;
559
560 if (block_nr != fs->icache->buffer_blk) {
561 retval = io_channel_read_blk(io, block_nr, 1,
562 fs->icache->buffer);
563 if (retval)
564 return retval;
565 fs->icache->buffer_blk = block_nr;
566 }
567
568 memcpy(ptr, ((char *) fs->icache->buffer) + (unsigned) offset,
569 clen);
570
571 offset = 0;
572 length -= clen;
573 ptr += clen;
574 block_nr++;
575 }
576
577#ifdef EXT2FS_ENABLE_SWAPFS
578 if ((fs->flags & EXT2_FLAG_SWAP_BYTES) ||
579 (fs->flags & EXT2_FLAG_SWAP_BYTES_READ))
580 ext2fs_swap_inode_full(fs, (struct ext2_inode_large *) inode,
581 (struct ext2_inode_large *) inode,
582 0, length);
583#endif
584
585 /* Update the inode cache */
586 fs->icache->cache_last = (fs->icache->cache_last + 1) %
587 fs->icache->cache_size;
588 fs->icache->cache[fs->icache->cache_last].ino = ino;
589 fs->icache->cache[fs->icache->cache_last].inode = *inode;
590
591 return 0;
592}
593
594errcode_t ext2fs_read_inode(ext2_filsys fs, ext2_ino_t ino,
595 struct ext2_inode * inode)
596{
597 return ext2fs_read_inode_full(fs, ino, inode,
598 sizeof(struct ext2_inode));
599}
600
601errcode_t ext2fs_write_inode_full(ext2_filsys fs, ext2_ino_t ino,
602 struct ext2_inode * inode, int bufsize)
603{
604 unsigned long group, block, block_nr, offset;
605 errcode_t retval = 0;
606 struct ext2_inode_large temp_inode, *w_inode;
607 char *ptr;
608 int clen, i, length;
609
610 EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
611
612 /* Check to see if user provided an override function */
613 if (fs->write_inode) {
614 retval = (fs->write_inode)(fs, ino, inode);
615 if (retval != EXT2_ET_CALLBACK_NOTHANDLED)
616 return retval;
617 }
618
619 /* Check to see if the inode cache needs to be updated */
620 if (fs->icache) {
621 for (i=0; i < fs->icache->cache_size; i++) {
622 if (fs->icache->cache[i].ino == ino) {
623 fs->icache->cache[i].inode = *inode;
624 break;
625 }
626 }
627 } else {
628 retval = create_icache(fs);
629 if (retval)
630 return retval;
631 }
632
633 if (!(fs->flags & EXT2_FLAG_RW))
634 return EXT2_ET_RO_FILSYS;
635
636 if ((ino == 0) || (ino > fs->super->s_inodes_count))
637 return EXT2_ET_BAD_INODE_NUM;
638
639 length = bufsize;
640 if (length < EXT2_INODE_SIZE(fs->super))
641 length = EXT2_INODE_SIZE(fs->super);
642
643 if (length > (int) sizeof(struct ext2_inode_large)) {
644 w_inode = malloc(length);
645 if (!w_inode)
646 return ENOMEM;
647 } else
648 w_inode = &temp_inode;
649 memset(w_inode, 0, length);
650
651#ifdef EXT2FS_ENABLE_SWAPFS
652 if ((fs->flags & EXT2_FLAG_SWAP_BYTES) ||
653 (fs->flags & EXT2_FLAG_SWAP_BYTES_WRITE))
654 ext2fs_swap_inode_full(fs, w_inode,
655 (struct ext2_inode_large *) inode,
656 1, bufsize);
657 else
658#endif
659 memcpy(w_inode, inode, bufsize);
660
661 group = (ino - 1) / EXT2_INODES_PER_GROUP(fs->super);
662 offset = ((ino - 1) % EXT2_INODES_PER_GROUP(fs->super)) *
663 EXT2_INODE_SIZE(fs->super);
664 block = offset >> EXT2_BLOCK_SIZE_BITS(fs->super);
665 if (!fs->group_desc[(unsigned) group].bg_inode_table)
666 return EXT2_ET_MISSING_INODE_TABLE;
667 block_nr = fs->group_desc[(unsigned) group].bg_inode_table + block;
668
669 offset &= (EXT2_BLOCK_SIZE(fs->super) - 1);
670
671 length = EXT2_INODE_SIZE(fs->super);
672 if (length > bufsize)
673 length = bufsize;
674
675 ptr = (char *) w_inode;
676
677 while (length) {
678 clen = length;
679 if ((offset + length) > fs->blocksize)
680 clen = fs->blocksize - offset;
681
682 if (fs->icache->buffer_blk != block_nr) {
683 retval = io_channel_read_blk(fs->io, block_nr, 1,
684 fs->icache->buffer);
685 if (retval)
686 goto errout;
687 fs->icache->buffer_blk = block_nr;
688 }
689
690
691 memcpy((char *) fs->icache->buffer + (unsigned) offset,
692 ptr, clen);
693
694 retval = io_channel_write_blk(fs->io, block_nr, 1,
695 fs->icache->buffer);
696 if (retval)
697 goto errout;
698
699 offset = 0;
700 ptr += clen;
701 length -= clen;
702 block_nr++;
703 }
704
705 fs->flags |= EXT2_FLAG_CHANGED;
706errout:
707 if (w_inode && w_inode != &temp_inode)
708 free(w_inode);
709 return retval;
710}
711
712errcode_t ext2fs_write_inode(ext2_filsys fs, ext2_ino_t ino,
713 struct ext2_inode *inode)
714{
715 return ext2fs_write_inode_full(fs, ino, inode,
716 sizeof(struct ext2_inode));
717}
718
719/*
720 * This function should be called when writing a new inode. It makes
721 * sure that extra part of large inodes is initialized properly.
722 */
723errcode_t ext2fs_write_new_inode(ext2_filsys fs, ext2_ino_t ino,
724 struct ext2_inode *inode)
725{
726 struct ext2_inode *buf;
727 int size = EXT2_INODE_SIZE(fs->super);
728 struct ext2_inode_large *large_inode;
729
730 if (size == sizeof(struct ext2_inode))
731 return ext2fs_write_inode_full(fs, ino, inode,
732 sizeof(struct ext2_inode));
733
734 buf = malloc(size);
735 if (!buf)
736 return ENOMEM;
737
738 memset(buf, 0, size);
739 *buf = *inode;
740
741 large_inode = (struct ext2_inode_large *) buf;
742 large_inode->i_extra_isize = sizeof(struct ext2_inode_large) -
743 EXT2_GOOD_OLD_INODE_SIZE;
744
745 return ext2fs_write_inode_full(fs, ino, buf, size);
746}
747
748
749errcode_t ext2fs_get_blocks(ext2_filsys fs, ext2_ino_t ino, blk_t *blocks)
750{
751 struct ext2_inode inode;
752 int i;
753 errcode_t retval;
754
755 EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
756
757 if (ino > fs->super->s_inodes_count)
758 return EXT2_ET_BAD_INODE_NUM;
759
760 if (fs->get_blocks) {
761 if (!(*fs->get_blocks)(fs, ino, blocks))
762 return 0;
763 }
764 retval = ext2fs_read_inode(fs, ino, &inode);
765 if (retval)
766 return retval;
767 for (i=0; i < EXT2_N_BLOCKS; i++)
768 blocks[i] = inode.i_block[i];
769 return 0;
770}
771
772errcode_t ext2fs_check_directory(ext2_filsys fs, ext2_ino_t ino)
773{
774 struct ext2_inode inode;
775 errcode_t retval;
776
777 EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
778
779 if (ino > fs->super->s_inodes_count)
780 return EXT2_ET_BAD_INODE_NUM;
781
782 if (fs->check_directory) {
783 retval = (fs->check_directory)(fs, ino);
784 if (retval != EXT2_ET_CALLBACK_NOTHANDLED)
785 return retval;
786 }
787 retval = ext2fs_read_inode(fs, ino, &inode);
788 if (retval)
789 return retval;
790 if (!LINUX_S_ISDIR(inode.i_mode))
791 return EXT2_ET_NO_DIRECTORY;
792 return 0;
793}
794
generated by cgit v1.2.3-55-g6feb (git 2.39.1) at 2025-08-15 08:21:08 +0000