1 /*
2 * pass3.c -- pass #3 of e2fsck: Check for directory connectivity
3 *
4 * Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 1999 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 * Pass #3 assures that all directories are connected to the
12 * filesystem tree, using the following algorithm:
13 *
14 * First, the root directory is checked to make sure it exists; if
15 * not, e2fsck will offer to create a new one. It is then marked as
16 * "done".
17 *
18 * Then, pass3 iterates over all directory inodes; for each directory
19 * it attempts to trace up the filesystem tree, using dirinfo.parent
20 * until it reaches a directory which has been marked "done". If it
21 * can not do so, then the directory must be disconnected, and e2fsck
22 * will offer to reconnect it to /lost+found. While it is chasing
23 * parent pointers up the filesystem tree, if pass3 sees a directory
24 * twice, then it has detected a filesystem loop, and it will again
25 * offer to reconnect the directory to /lost+found in order to break the
26 * filesystem loop.
27 *
28 * Pass 3 also contains the subroutine, e2fsck_reconnect_file() to
29 * reconnect inodes to /lost+found; this subroutine is also used by
30 * pass 4. e2fsck_reconnect_file() calls get_lost_and_found(), which
31 * is responsible for creating /lost+found if it does not exist.
32 *
33 * Pass 3 frees the following data structures:
34 * - The dirinfo directory information cache.
35 */
36
37 #include "config.h"
38 #ifdef HAVE_ERRNO_H
39 #include <errno.h>
40 #endif
41
42 #include "e2fsck.h"
43 #include "problem.h"
44
45 static void check_root(e2fsck_t ctx);
46 static int check_directory(e2fsck_t ctx, ext2_ino_t ino,
47 struct problem_context *pctx);
48 static void fix_dotdot(e2fsck_t ctx, ext2_ino_t ino, ext2_ino_t parent);
49
50 static ext2fs_inode_bitmap inode_loop_detect = 0;
51 static ext2fs_inode_bitmap inode_done_map = 0;
52
e2fsck_pass3(e2fsck_t ctx)53 void e2fsck_pass3(e2fsck_t ctx)
54 {
55 ext2_filsys fs = ctx->fs;
56 struct dir_info_iter *iter = NULL;
57 #ifdef RESOURCE_TRACK
58 struct resource_track rtrack;
59 #endif
60 struct problem_context pctx;
61 struct dir_info *dir;
62 unsigned long maxdirs, count;
63
64 init_resource_track(&rtrack, ctx->fs->io);
65 clear_problem_context(&pctx);
66
67 #ifdef MTRACE
68 mtrace_print("Pass 3");
69 #endif
70
71 if (!(ctx->options & E2F_OPT_PREEN))
72 fix_problem(ctx, PR_3_PASS_HEADER, &pctx);
73
74 /*
75 * Allocate some bitmaps to do loop detection.
76 */
77 pctx.errcode = e2fsck_allocate_inode_bitmap(fs, _("inode done bitmap"),
78 EXT2FS_BMAP64_AUTODIR,
79 "inode_done_map", &inode_done_map);
80 if (pctx.errcode) {
81 pctx.num = 2;
82 fix_problem(ctx, PR_3_ALLOCATE_IBITMAP_ERROR, &pctx);
83 ctx->flags |= E2F_FLAG_ABORT;
84 goto abort_exit;
85 }
86 print_resource_track(ctx, _("Peak memory"), &ctx->global_rtrack, NULL);
87
88 check_root(ctx);
89 if (ctx->flags & E2F_FLAG_SIGNAL_MASK)
90 goto abort_exit;
91
92 ext2fs_mark_inode_bitmap2(inode_done_map, EXT2_ROOT_INO);
93
94 maxdirs = e2fsck_get_num_dirinfo(ctx);
95 count = 1;
96
97 if (ctx->progress)
98 if ((ctx->progress)(ctx, 3, 0, maxdirs))
99 goto abort_exit;
100
101 iter = e2fsck_dir_info_iter_begin(ctx);
102 while ((dir = e2fsck_dir_info_iter(ctx, iter)) != 0) {
103 if (ctx->flags & E2F_FLAG_SIGNAL_MASK ||
104 ctx->flags & E2F_FLAG_RESTART)
105 goto abort_exit;
106 if (ctx->progress && (ctx->progress)(ctx, 3, count++, maxdirs))
107 goto abort_exit;
108 if (ext2fs_test_inode_bitmap2(ctx->inode_dir_map, dir->ino))
109 if (check_directory(ctx, dir->ino, &pctx))
110 goto abort_exit;
111 }
112
113 /*
114 * Force the creation of /lost+found if not present
115 */
116 if ((ctx->options & E2F_OPT_READONLY) == 0)
117 e2fsck_get_lost_and_found(ctx, 1);
118
119 /*
120 * If there are any directories that need to be indexed or
121 * optimized, do it here.
122 */
123 e2fsck_rehash_directories(ctx);
124
125 abort_exit:
126 if (iter)
127 e2fsck_dir_info_iter_end(ctx, iter);
128 e2fsck_free_dir_info(ctx);
129 if (inode_loop_detect) {
130 ext2fs_free_inode_bitmap(inode_loop_detect);
131 inode_loop_detect = 0;
132 }
133 if (inode_done_map) {
134 ext2fs_free_inode_bitmap(inode_done_map);
135 inode_done_map = 0;
136 }
137
138 if (ctx->lnf_repair_block) {
139 ext2fs_unmark_block_bitmap2(ctx->block_found_map,
140 ctx->lnf_repair_block);
141 ctx->lnf_repair_block = 0;
142 }
143 if (ctx->root_repair_block) {
144 ext2fs_unmark_block_bitmap2(ctx->block_found_map,
145 ctx->root_repair_block);
146 ctx->root_repair_block = 0;
147 }
148
149 print_resource_track(ctx, _("Pass 3"), &rtrack, ctx->fs->io);
150 }
151
152 /*
153 * This makes sure the root inode is present; if not, we ask if the
154 * user wants us to create it. Not creating it is a fatal error.
155 */
check_root(e2fsck_t ctx)156 static void check_root(e2fsck_t ctx)
157 {
158 ext2_filsys fs = ctx->fs;
159 blk64_t blk;
160 struct ext2_inode_large inode;
161 struct ext2_inode *iptr = (struct ext2_inode *) &inode;
162 char * block;
163 struct problem_context pctx;
164
165 clear_problem_context(&pctx);
166
167 if (ext2fs_test_inode_bitmap2(ctx->inode_used_map, EXT2_ROOT_INO)) {
168 /*
169 * If the root inode is not a directory, die here. The
170 * user must have answered 'no' in pass1 when we
171 * offered to clear it.
172 */
173 if (!(ext2fs_test_inode_bitmap2(ctx->inode_dir_map,
174 EXT2_ROOT_INO))) {
175 fix_problem(ctx, PR_3_ROOT_NOT_DIR_ABORT, &pctx);
176 ctx->flags |= E2F_FLAG_ABORT;
177 }
178 return;
179 }
180
181 if (!fix_problem(ctx, PR_3_NO_ROOT_INODE, &pctx)) {
182 fix_problem(ctx, PR_3_NO_ROOT_INODE_ABORT, &pctx);
183 ctx->flags |= E2F_FLAG_ABORT;
184 return;
185 }
186
187 e2fsck_read_bitmaps(ctx);
188
189 /*
190 * First, find a free block
191 */
192 if (ctx->root_repair_block) {
193 blk = ctx->root_repair_block;
194 ctx->root_repair_block = 0;
195 goto skip_new_block;
196 }
197 pctx.errcode = ext2fs_new_block2(fs, 0, ctx->block_found_map, &blk);
198 if (pctx.errcode) {
199 pctx.str = "ext2fs_new_block";
200 fix_problem(ctx, PR_3_CREATE_ROOT_ERROR, &pctx);
201 ctx->flags |= E2F_FLAG_ABORT;
202 return;
203 }
204 ext2fs_mark_block_bitmap2(ctx->block_found_map, blk);
205 skip_new_block:
206 ext2fs_mark_block_bitmap2(fs->block_map, blk);
207 ext2fs_mark_bb_dirty(fs);
208
209 /*
210 * Set up the inode structure
211 */
212 memset(&inode, 0, sizeof(inode));
213 inode.i_mode = 040755;
214 inode.i_size = fs->blocksize;
215 inode.i_atime = inode.i_ctime = inode.i_mtime = ctx->now;
216 inode.i_links_count = 2;
217 ext2fs_iblk_set(fs, iptr, 1);
218 inode.i_block[0] = blk;
219 inode.i_extra_isize = sizeof(struct ext2_inode_large) -
220 EXT2_GOOD_OLD_INODE_SIZE;
221
222 /*
223 * Write out the inode.
224 */
225 pctx.errcode = ext2fs_write_new_inode(fs, EXT2_ROOT_INO, iptr);
226 if (pctx.errcode) {
227 pctx.str = "ext2fs_write_inode";
228 fix_problem(ctx, PR_3_CREATE_ROOT_ERROR, &pctx);
229 ctx->flags |= E2F_FLAG_ABORT;
230 return;
231 }
232
233 /*
234 * Now let's create the actual data block for the inode.
235 * Due to metadata_csum, we must write the dir blocks AFTER
236 * the inode has been written to disk!
237 */
238 pctx.errcode = ext2fs_new_dir_block(fs, EXT2_ROOT_INO, EXT2_ROOT_INO,
239 &block);
240 if (pctx.errcode) {
241 pctx.str = "ext2fs_new_dir_block";
242 fix_problem(ctx, PR_3_CREATE_ROOT_ERROR, &pctx);
243 ctx->flags |= E2F_FLAG_ABORT;
244 return;
245 }
246
247 pctx.errcode = ext2fs_write_dir_block4(fs, blk, block, 0,
248 EXT2_ROOT_INO);
249 ext2fs_free_mem(&block);
250 if (pctx.errcode) {
251 pctx.str = "ext2fs_write_dir_block4";
252 fix_problem(ctx, PR_3_CREATE_ROOT_ERROR, &pctx);
253 ctx->flags |= E2F_FLAG_ABORT;
254 return;
255 }
256
257 /*
258 * Miscellaneous bookkeeping...
259 */
260 e2fsck_add_dir_info(ctx, EXT2_ROOT_INO, EXT2_ROOT_INO);
261 ext2fs_icount_store(ctx->inode_count, EXT2_ROOT_INO, 2);
262 ext2fs_icount_store(ctx->inode_link_info, EXT2_ROOT_INO, 2);
263
264 ext2fs_mark_inode_bitmap2(ctx->inode_used_map, EXT2_ROOT_INO);
265 ext2fs_mark_inode_bitmap2(ctx->inode_dir_map, EXT2_ROOT_INO);
266 ext2fs_mark_inode_bitmap2(fs->inode_map, EXT2_ROOT_INO);
267 ext2fs_mark_ib_dirty(fs);
268 quota_data_add(ctx->qctx, &inode, EXT2_ROOT_INO,
269 EXT2_CLUSTER_SIZE(fs->super));
270 quota_data_inodes(ctx->qctx, &inode, EXT2_ROOT_INO, +1);
271 }
272
273 /*
274 * This subroutine is responsible for making sure that a particular
275 * directory is connected to the root; if it isn't we trace it up as
276 * far as we can go, and then offer to connect the resulting parent to
277 * the lost+found. We have to do loop detection; if we ever discover
278 * a loop, we treat that as a disconnected directory and offer to
279 * reparent it to lost+found.
280 *
281 * However, loop detection is expensive, because for very large
282 * filesystems, the inode_loop_detect bitmap is huge, and clearing it
283 * is non-trivial. Loops in filesystems are also a rare error case,
284 * and we shouldn't optimize for error cases. So we try two passes of
285 * the algorithm. The first time, we ignore loop detection and merely
286 * increment a counter; if the counter exceeds some extreme threshold,
287 * then we try again with the loop detection bitmap enabled.
288 */
check_directory(e2fsck_t ctx,ext2_ino_t dir,struct problem_context * pctx)289 static int check_directory(e2fsck_t ctx, ext2_ino_t dir,
290 struct problem_context *pctx)
291 {
292 ext2_filsys fs = ctx->fs;
293 ext2_ino_t ino = dir, parent;
294 int loop_pass = 0, parent_count = 0;
295
296 while (1) {
297 /*
298 * Mark this inode as being "done"; by the time we
299 * return from this function, the inode we either be
300 * verified as being connected to the directory tree,
301 * or we will have offered to reconnect this to
302 * lost+found.
303 *
304 * If it was marked done already, then we've reached a
305 * parent we've already checked.
306 */
307 if (ext2fs_mark_inode_bitmap2(inode_done_map, ino))
308 break;
309
310 if (e2fsck_dir_info_get_parent(ctx, ino, &parent)) {
311 fix_problem(ctx, PR_3_NO_DIRINFO, pctx);
312 return 0;
313 }
314
315 /*
316 * If this directory doesn't have a parent, or we've
317 * seen the parent once already, then offer to
318 * reparent it to lost+found
319 */
320 if (!parent ||
321 (loop_pass &&
322 ext2fs_test_inode_bitmap2(inode_loop_detect, parent))) {
323 pctx->ino = ino;
324 if (parent)
325 pctx->dir = parent;
326 else
327 (void) ext2fs_lookup(fs, ino, "..", 2, NULL,
328 &pctx->dir);
329 if (fix_problem(ctx, !parent ? PR_3_UNCONNECTED_DIR :
330 PR_3_LOOPED_DIR, pctx)) {
331 if (e2fsck_reconnect_file(ctx, pctx->ino)) {
332 ext2fs_unmark_valid(fs);
333 } else {
334 fix_dotdot(ctx, pctx->ino,
335 ctx->lost_and_found);
336 parent = ctx->lost_and_found;
337 }
338 }
339 break;
340 }
341 ino = parent;
342 if (loop_pass) {
343 ext2fs_mark_inode_bitmap2(inode_loop_detect, ino);
344 } else if (parent_count++ > 2048) {
345 /*
346 * If we've run into a path depth that's
347 * greater than 2048, try again with the inode
348 * loop bitmap turned on and start from the
349 * top.
350 */
351 loop_pass = 1;
352 if (inode_loop_detect)
353 ext2fs_clear_inode_bitmap(inode_loop_detect);
354 else {
355 pctx->errcode = e2fsck_allocate_inode_bitmap(fs, _("inode loop detection bitmap"), EXT2FS_BMAP64_AUTODIR, "inode_loop_detect", &inode_loop_detect);
356 if (pctx->errcode) {
357 pctx->num = 1;
358 fix_problem(ctx,
359 PR_3_ALLOCATE_IBITMAP_ERROR, pctx);
360 ctx->flags |= E2F_FLAG_ABORT;
361 return -1;
362 }
363 }
364 ino = dir;
365 }
366 }
367
368 /*
369 * Make sure that .. and the parent directory are the same;
370 * offer to fix it if not.
371 */
372 pctx->ino = dir;
373 if (e2fsck_dir_info_get_dotdot(ctx, dir, &pctx->ino2) ||
374 e2fsck_dir_info_get_parent(ctx, dir, &pctx->dir)) {
375 fix_problem(ctx, PR_3_NO_DIRINFO, pctx);
376 return 0;
377 }
378 if (pctx->ino2 != pctx->dir) {
379 if (fix_problem(ctx, PR_3_BAD_DOT_DOT, pctx))
380 fix_dotdot(ctx, dir, pctx->dir);
381 }
382 return 0;
383 }
384
385 /*
386 * This routine gets the lost_and_found inode, making it a directory
387 * if necessary
388 */
e2fsck_get_lost_and_found(e2fsck_t ctx,int fix)389 ext2_ino_t e2fsck_get_lost_and_found(e2fsck_t ctx, int fix)
390 {
391 ext2_filsys fs = ctx->fs;
392 ext2_ino_t ino;
393 blk64_t blk;
394 errcode_t retval;
395 struct ext2_inode_large inode;
396 char * block;
397 static const char name[] = "lost+found";
398 struct problem_context pctx;
399 int will_rehash, flags;
400
401 if (ctx->lost_and_found)
402 return ctx->lost_and_found;
403
404 clear_problem_context(&pctx);
405
406 will_rehash = e2fsck_dir_will_be_rehashed(ctx, EXT2_ROOT_INO);
407 if (will_rehash) {
408 flags = ctx->fs->flags;
409 ctx->fs->flags |= EXT2_FLAG_IGNORE_CSUM_ERRORS;
410 }
411 retval = ext2fs_lookup(fs, EXT2_ROOT_INO, name,
412 sizeof(name)-1, 0, &ino);
413 if (will_rehash)
414 ctx->fs->flags = (flags & EXT2_FLAG_IGNORE_CSUM_ERRORS) |
415 (ctx->fs->flags & ~EXT2_FLAG_IGNORE_CSUM_ERRORS);
416 if (retval && !fix)
417 return 0;
418 if (!retval) {
419 /* Lost+found shouldn't have inline data */
420 retval = ext2fs_read_inode_full(fs, ino, EXT2_INODE(&inode),
421 sizeof(inode));
422 if (fix && retval)
423 return 0;
424
425 if (fix && (inode.i_flags & EXT4_INLINE_DATA_FL)) {
426 if (!fix_problem(ctx, PR_3_LPF_INLINE_DATA, &pctx))
427 return 0;
428 goto unlink;
429 }
430
431 if (fix && (inode.i_flags & EXT4_ENCRYPT_FL)) {
432 if (!fix_problem(ctx, PR_3_LPF_ENCRYPTED, &pctx))
433 return 0;
434 goto unlink;
435 }
436
437 if (ext2fs_check_directory(fs, ino) == 0) {
438 ctx->lost_and_found = ino;
439 return ino;
440 }
441
442 /* Lost+found isn't a directory! */
443 if (!fix)
444 return 0;
445 pctx.ino = ino;
446 if (!fix_problem(ctx, PR_3_LPF_NOTDIR, &pctx))
447 return 0;
448
449 unlink:
450 /* OK, unlink the old /lost+found file. */
451 pctx.errcode = ext2fs_unlink(fs, EXT2_ROOT_INO, name, ino, 0);
452 if (pctx.errcode) {
453 pctx.str = "ext2fs_unlink";
454 fix_problem(ctx, PR_3_CREATE_LPF_ERROR, &pctx);
455 return 0;
456 }
457 (void) e2fsck_dir_info_set_parent(ctx, ino, 0);
458 e2fsck_adjust_inode_count(ctx, ino, -1);
459 /*
460 * If the old lost+found was a directory, we've just
461 * disconnected it from the directory tree, which
462 * means we need to restart the directory tree scan.
463 * The simplest way to do this is restart the whole
464 * e2fsck operation.
465 */
466 if (LINUX_S_ISDIR(inode.i_mode))
467 ctx->flags |= E2F_FLAG_RESTART;
468 } else if (retval != EXT2_ET_FILE_NOT_FOUND) {
469 pctx.errcode = retval;
470 fix_problem(ctx, PR_3_ERR_FIND_LPF, &pctx);
471 }
472 if (!fix_problem(ctx, PR_3_NO_LF_DIR, 0))
473 return 0;
474
475 /*
476 * Read the inode and block bitmaps in; we'll be messing with
477 * them.
478 */
479 e2fsck_read_bitmaps(ctx);
480
481 /*
482 * First, find a free block
483 */
484 if (ctx->lnf_repair_block) {
485 blk = ctx->lnf_repair_block;
486 ctx->lnf_repair_block = 0;
487 goto skip_new_block;
488 }
489 retval = ext2fs_new_block2(fs, 0, ctx->block_found_map, &blk);
490 if (retval == EXT2_ET_BLOCK_ALLOC_FAIL &&
491 fix_problem(ctx, PR_3_LPF_NO_SPACE, &pctx)) {
492 fix_problem(ctx, PR_3_NO_SPACE_TO_RECOVER, &pctx);
493 ctx->lost_and_found = EXT2_ROOT_INO;
494 return 0;
495 }
496 if (retval) {
497 pctx.errcode = retval;
498 fix_problem(ctx, PR_3_ERR_LPF_NEW_BLOCK, &pctx);
499 return 0;
500 }
501 ext2fs_mark_block_bitmap2(ctx->block_found_map, blk);
502 skip_new_block:
503 ext2fs_block_alloc_stats2(fs, blk, +1);
504
505 /*
506 * Next find a free inode.
507 */
508 retval = ext2fs_new_inode(fs, EXT2_ROOT_INO, 040700,
509 ctx->inode_used_map, &ino);
510 if (retval == EXT2_ET_INODE_ALLOC_FAIL &&
511 fix_problem(ctx, PR_3_LPF_NO_SPACE, &pctx)) {
512 fix_problem(ctx, PR_3_NO_SPACE_TO_RECOVER, &pctx);
513 ctx->lost_and_found = EXT2_ROOT_INO;
514 return 0;
515 }
516 if (retval) {
517 pctx.errcode = retval;
518 fix_problem(ctx, PR_3_ERR_LPF_NEW_INODE, &pctx);
519 return 0;
520 }
521 ext2fs_mark_inode_bitmap2(ctx->inode_used_map, ino);
522 ext2fs_mark_inode_bitmap2(ctx->inode_dir_map, ino);
523 ext2fs_inode_alloc_stats2(fs, ino, +1, 1);
524
525 /*
526 * Set up the inode structure
527 */
528 memset(&inode, 0, sizeof(inode));
529 inode.i_mode = 040700;
530 inode.i_size = fs->blocksize;
531 inode.i_atime = inode.i_ctime = inode.i_mtime = ctx->now;
532 inode.i_links_count = 2;
533 ext2fs_iblk_set(fs, EXT2_INODE(&inode), 1);
534 inode.i_block[0] = blk;
535
536 /*
537 * Next, write out the inode.
538 */
539 pctx.errcode = ext2fs_write_new_inode(fs, ino, EXT2_INODE(&inode));
540 if (pctx.errcode) {
541 pctx.str = "ext2fs_write_inode";
542 fix_problem(ctx, PR_3_CREATE_LPF_ERROR, &pctx);
543 return 0;
544 }
545
546 /*
547 * Now let's create the actual data block for the inode.
548 * Due to metadata_csum, the directory block MUST be written
549 * after the inode is written to disk!
550 */
551 retval = ext2fs_new_dir_block(fs, ino, EXT2_ROOT_INO, &block);
552 if (retval) {
553 pctx.errcode = retval;
554 fix_problem(ctx, PR_3_ERR_LPF_NEW_DIR_BLOCK, &pctx);
555 return 0;
556 }
557
558 retval = ext2fs_write_dir_block4(fs, blk, block, 0, ino);
559 ext2fs_free_mem(&block);
560 if (retval) {
561 pctx.errcode = retval;
562 fix_problem(ctx, PR_3_ERR_LPF_WRITE_BLOCK, &pctx);
563 return 0;
564 }
565
566 /*
567 * Finally, create the directory link
568 */
569 pctx.errcode = ext2fs_link(fs, EXT2_ROOT_INO, name, ino, EXT2_FT_DIR);
570 if (pctx.errcode == EXT2_ET_DIR_NO_SPACE) {
571 pctx.errcode = ext2fs_expand_dir(fs, EXT2_ROOT_INO);
572 if (pctx.errcode)
573 goto link_error;
574 pctx.errcode = ext2fs_link(fs, EXT2_ROOT_INO, name, ino,
575 EXT2_FT_DIR);
576 }
577 if (pctx.errcode) {
578 link_error:
579 pctx.str = "ext2fs_link";
580 fix_problem(ctx, PR_3_CREATE_LPF_ERROR, &pctx);
581 return 0;
582 }
583
584 /*
585 * Miscellaneous bookkeeping that needs to be kept straight.
586 */
587 e2fsck_add_dir_info(ctx, ino, EXT2_ROOT_INO);
588 e2fsck_adjust_inode_count(ctx, EXT2_ROOT_INO, 1);
589 ext2fs_icount_store(ctx->inode_count, ino, 2);
590 ext2fs_icount_store(ctx->inode_link_info, ino, 2);
591 ctx->lost_and_found = ino;
592 quota_data_add(ctx->qctx, &inode, ino, EXT2_CLUSTER_SIZE(fs->super));
593 quota_data_inodes(ctx->qctx, &inode, ino, +1);
594 #if 0
595 printf("/lost+found created; inode #%lu\n", ino);
596 #endif
597 return ino;
598 }
599
600 /*
601 * This routine will connect a file to lost+found
602 */
e2fsck_reconnect_file(e2fsck_t ctx,ext2_ino_t ino)603 int e2fsck_reconnect_file(e2fsck_t ctx, ext2_ino_t ino)
604 {
605 ext2_filsys fs = ctx->fs;
606 errcode_t retval;
607 char name[80];
608 struct problem_context pctx;
609 struct ext2_inode inode;
610 int file_type = 0;
611
612 clear_problem_context(&pctx);
613 pctx.ino = ino;
614
615 if (!ctx->bad_lost_and_found && !ctx->lost_and_found) {
616 if (e2fsck_get_lost_and_found(ctx, 1) == 0)
617 ctx->bad_lost_and_found++;
618 }
619 if (ctx->bad_lost_and_found) {
620 fix_problem(ctx, PR_3_NO_LPF, &pctx);
621 return 1;
622 }
623
624 sprintf(name, "#%u", ino);
625 if (ext2fs_read_inode(fs, ino, &inode) == 0)
626 file_type = ext2_file_type(inode.i_mode);
627 retval = ext2fs_link(fs, ctx->lost_and_found, name, ino, file_type);
628 if (retval == EXT2_ET_DIR_NO_SPACE) {
629 if (!fix_problem(ctx, PR_3_EXPAND_LF_DIR, &pctx))
630 return 1;
631 retval = e2fsck_expand_directory(ctx, ctx->lost_and_found,
632 1, 0);
633 if (retval) {
634 pctx.errcode = retval;
635 fix_problem(ctx, PR_3_CANT_EXPAND_LPF, &pctx);
636 return 1;
637 }
638 retval = ext2fs_link(fs, ctx->lost_and_found, name,
639 ino, file_type);
640 }
641 if (retval) {
642 pctx.errcode = retval;
643 fix_problem(ctx, PR_3_CANT_RECONNECT, &pctx);
644 return 1;
645 }
646 e2fsck_adjust_inode_count(ctx, ino, 1);
647
648 return 0;
649 }
650
651 /*
652 * Utility routine to adjust the inode counts on an inode.
653 */
e2fsck_adjust_inode_count(e2fsck_t ctx,ext2_ino_t ino,int adj)654 errcode_t e2fsck_adjust_inode_count(e2fsck_t ctx, ext2_ino_t ino, int adj)
655 {
656 ext2_filsys fs = ctx->fs;
657 errcode_t retval;
658 struct ext2_inode inode;
659
660 if (!ino)
661 return 0;
662
663 retval = ext2fs_read_inode(fs, ino, &inode);
664 if (retval)
665 return retval;
666
667 #if 0
668 printf("Adjusting link count for inode %lu by %d (from %d)\n", ino, adj,
669 inode.i_links_count);
670 #endif
671
672 if (adj == 1) {
673 ext2fs_icount_increment(ctx->inode_count, ino, 0);
674 if (inode.i_links_count == (__u16) ~0)
675 return 0;
676 ext2fs_icount_increment(ctx->inode_link_info, ino, 0);
677 inode.i_links_count++;
678 } else if (adj == -1) {
679 ext2fs_icount_decrement(ctx->inode_count, ino, 0);
680 if (inode.i_links_count == 0)
681 return 0;
682 ext2fs_icount_decrement(ctx->inode_link_info, ino, 0);
683 inode.i_links_count--;
684 }
685
686 retval = ext2fs_write_inode(fs, ino, &inode);
687 if (retval)
688 return retval;
689
690 return 0;
691 }
692
693 /*
694 * Fix parent --- this routine fixes up the parent of a directory.
695 */
696 struct fix_dotdot_struct {
697 ext2_filsys fs;
698 ext2_ino_t parent;
699 int done;
700 e2fsck_t ctx;
701 };
702
fix_dotdot_proc(struct ext2_dir_entry * dirent,int offset EXT2FS_ATTR ((unused)),int blocksize EXT2FS_ATTR ((unused)),char * buf EXT2FS_ATTR ((unused)),void * priv_data)703 static int fix_dotdot_proc(struct ext2_dir_entry *dirent,
704 int offset EXT2FS_ATTR((unused)),
705 int blocksize EXT2FS_ATTR((unused)),
706 char *buf EXT2FS_ATTR((unused)),
707 void *priv_data)
708 {
709 struct fix_dotdot_struct *fp = (struct fix_dotdot_struct *) priv_data;
710 errcode_t retval;
711 struct problem_context pctx;
712
713 if (ext2fs_dirent_name_len(dirent) != 2)
714 return 0;
715 if (strncmp(dirent->name, "..", 2))
716 return 0;
717
718 clear_problem_context(&pctx);
719
720 retval = e2fsck_adjust_inode_count(fp->ctx, dirent->inode, -1);
721 if (retval) {
722 pctx.errcode = retval;
723 fix_problem(fp->ctx, PR_3_ADJUST_INODE, &pctx);
724 }
725 retval = e2fsck_adjust_inode_count(fp->ctx, fp->parent, 1);
726 if (retval) {
727 pctx.errcode = retval;
728 fix_problem(fp->ctx, PR_3_ADJUST_INODE, &pctx);
729 }
730 dirent->inode = fp->parent;
731 if (ext2fs_has_feature_filetype(fp->ctx->fs->super))
732 ext2fs_dirent_set_file_type(dirent, EXT2_FT_DIR);
733 else
734 ext2fs_dirent_set_file_type(dirent, EXT2_FT_UNKNOWN);
735
736 fp->done++;
737 return DIRENT_ABORT | DIRENT_CHANGED;
738 }
739
fix_dotdot(e2fsck_t ctx,ext2_ino_t ino,ext2_ino_t parent)740 static void fix_dotdot(e2fsck_t ctx, ext2_ino_t ino, ext2_ino_t parent)
741 {
742 ext2_filsys fs = ctx->fs;
743 errcode_t retval;
744 struct fix_dotdot_struct fp;
745 struct problem_context pctx;
746 int flags, will_rehash;
747
748 fp.fs = fs;
749 fp.parent = parent;
750 fp.done = 0;
751 fp.ctx = ctx;
752
753 #if 0
754 printf("Fixing '..' of inode %lu to be %lu...\n", ino, parent);
755 #endif
756
757 clear_problem_context(&pctx);
758 pctx.ino = ino;
759 will_rehash = e2fsck_dir_will_be_rehashed(ctx, ino);
760 if (will_rehash) {
761 flags = ctx->fs->flags;
762 ctx->fs->flags |= EXT2_FLAG_IGNORE_CSUM_ERRORS;
763 }
764 retval = ext2fs_dir_iterate(fs, ino, DIRENT_FLAG_INCLUDE_EMPTY,
765 0, fix_dotdot_proc, &fp);
766 if (will_rehash)
767 ctx->fs->flags = (flags & EXT2_FLAG_IGNORE_CSUM_ERRORS) |
768 (ctx->fs->flags & ~EXT2_FLAG_IGNORE_CSUM_ERRORS);
769 if (retval || !fp.done) {
770 pctx.errcode = retval;
771 fix_problem(ctx, retval ? PR_3_FIX_PARENT_ERR :
772 PR_3_FIX_PARENT_NOFIND, &pctx);
773 ext2fs_unmark_valid(fs);
774 }
775 (void) e2fsck_dir_info_set_dotdot(ctx, ino, parent);
776 if (e2fsck_dir_info_set_parent(ctx, ino, ctx->lost_and_found))
777 fix_problem(ctx, PR_3_NO_DIRINFO, &pctx);
778
779 return;
780 }
781
782 /*
783 * These routines are responsible for expanding a /lost+found if it is
784 * too small.
785 */
786
787 struct expand_dir_struct {
788 blk64_t num;
789 e2_blkcnt_t guaranteed_size;
790 blk64_t newblocks;
791 blk64_t last_block;
792 errcode_t err;
793 e2fsck_t ctx;
794 ext2_ino_t dir;
795 };
796
expand_dir_proc(ext2_filsys fs,blk64_t * blocknr,e2_blkcnt_t blockcnt,blk64_t ref_block EXT2FS_ATTR ((unused)),int ref_offset EXT2FS_ATTR ((unused)),void * priv_data)797 static int expand_dir_proc(ext2_filsys fs,
798 blk64_t *blocknr,
799 e2_blkcnt_t blockcnt,
800 blk64_t ref_block EXT2FS_ATTR((unused)),
801 int ref_offset EXT2FS_ATTR((unused)),
802 void *priv_data)
803 {
804 struct expand_dir_struct *es = (struct expand_dir_struct *) priv_data;
805 blk64_t new_blk;
806 static blk64_t last_blk = 0;
807 char *block;
808 errcode_t retval;
809 e2fsck_t ctx;
810
811 ctx = es->ctx;
812
813 if (es->guaranteed_size && blockcnt >= es->guaranteed_size)
814 return BLOCK_ABORT;
815
816 if (blockcnt > 0)
817 es->last_block = blockcnt;
818 if (*blocknr) {
819 last_blk = *blocknr;
820 return 0;
821 }
822
823 if (blockcnt &&
824 (EXT2FS_B2C(fs, last_blk) == EXT2FS_B2C(fs, last_blk + 1)))
825 new_blk = last_blk + 1;
826 else {
827 last_blk &= ~EXT2FS_CLUSTER_MASK(fs);
828 retval = ext2fs_new_block2(fs, last_blk, ctx->block_found_map,
829 &new_blk);
830 if (retval) {
831 es->err = retval;
832 return BLOCK_ABORT;
833 }
834 es->newblocks++;
835 ext2fs_block_alloc_stats2(fs, new_blk, +1);
836 }
837 last_blk = new_blk;
838
839 if (blockcnt > 0) {
840 retval = ext2fs_new_dir_block(fs, 0, 0, &block);
841 if (retval) {
842 es->err = retval;
843 return BLOCK_ABORT;
844 }
845 es->num--;
846 retval = ext2fs_write_dir_block4(fs, new_blk, block, 0,
847 es->dir);
848 ext2fs_free_mem(&block);
849 } else
850 retval = ext2fs_zero_blocks2(fs, new_blk, 1, NULL, NULL);
851 if (retval) {
852 es->err = retval;
853 return BLOCK_ABORT;
854 }
855 *blocknr = new_blk;
856 ext2fs_mark_block_bitmap2(ctx->block_found_map, new_blk);
857
858 if (es->num == 0)
859 return (BLOCK_CHANGED | BLOCK_ABORT);
860 else
861 return BLOCK_CHANGED;
862 }
863
e2fsck_expand_directory(e2fsck_t ctx,ext2_ino_t dir,int num,int guaranteed_size)864 errcode_t e2fsck_expand_directory(e2fsck_t ctx, ext2_ino_t dir,
865 int num, int guaranteed_size)
866 {
867 ext2_filsys fs = ctx->fs;
868 errcode_t retval;
869 struct expand_dir_struct es;
870 struct ext2_inode_large inode;
871 blk64_t sz;
872
873 if (!(fs->flags & EXT2_FLAG_RW))
874 return EXT2_ET_RO_FILSYS;
875
876 /*
877 * Read the inode and block bitmaps in; we'll be messing with
878 * them.
879 */
880 e2fsck_read_bitmaps(ctx);
881
882 retval = ext2fs_check_directory(fs, dir);
883 if (retval)
884 return retval;
885
886 es.num = num;
887 es.guaranteed_size = guaranteed_size;
888 es.last_block = 0;
889 es.err = 0;
890 es.newblocks = 0;
891 es.ctx = ctx;
892 es.dir = dir;
893
894 retval = ext2fs_block_iterate3(fs, dir, BLOCK_FLAG_APPEND,
895 0, expand_dir_proc, &es);
896
897 if (es.err)
898 return es.err;
899
900 /*
901 * Update the size and block count fields in the inode.
902 */
903 retval = ext2fs_read_inode_full(fs, dir,
904 EXT2_INODE(&inode), sizeof(inode));
905 if (retval)
906 return retval;
907
908 sz = (es.last_block + 1) * fs->blocksize;
909 retval = ext2fs_inode_size_set(fs, EXT2_INODE(&inode), sz);
910 if (retval)
911 return retval;
912 ext2fs_iblk_add_blocks(fs, EXT2_INODE(&inode), es.newblocks);
913 quota_data_add(ctx->qctx, &inode, dir,
914 es.newblocks * EXT2_CLUSTER_SIZE(fs->super));
915
916 e2fsck_write_inode_full(ctx, dir, EXT2_INODE(&inode),
917 sizeof(inode), "expand_directory");
918
919 return 0;
920 }
921
922