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audit: complex interfield comparison helper
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / ubifs / debug.c
blobb09ba2dd8b625efc12130e7a20572560072d8b3b
1 /*
2 * This file is part of UBIFS.
3 *
4 * Copyright (C) 2006-2008 Nokia Corporation
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 as published by
8 * the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * more details.
14 *
15 * You should have received a copy of the GNU General Public License along with
16 * this program; if not, write to the Free Software Foundation, Inc., 51
17 * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
18 *
19 * Authors: Artem Bityutskiy (Битюцкий Артём)
20 * Adrian Hunter
21 */
22
23 /*
24 * This file implements most of the debugging stuff which is compiled in only
25 * when it is enabled. But some debugging check functions are implemented in
26 * corresponding subsystem, just because they are closely related and utilize
27 * various local functions of those subsystems.
28 */
29
30 #include <linux/module.h>
31 #include <linux/debugfs.h>
32 #include <linux/math64.h>
33 #include <linux/uaccess.h>
34 #include <linux/random.h>
35 #include "ubifs.h"
36
37 #ifdef CONFIG_UBIFS_FS_DEBUG
38
39 DEFINE_SPINLOCK(dbg_lock);
40
41 static char dbg_key_buf0[128];
42 static char dbg_key_buf1[128];
43
44 static const char *get_key_fmt(int fmt)
45 {
46 switch (fmt) {
47 case UBIFS_SIMPLE_KEY_FMT:
48 return "simple";
49 default:
50 return "unknown/invalid format";
51 }
52 }
53
54 static const char *get_key_hash(int hash)
55 {
56 switch (hash) {
57 case UBIFS_KEY_HASH_R5:
58 return "R5";
59 case UBIFS_KEY_HASH_TEST:
60 return "test";
61 default:
62 return "unknown/invalid name hash";
63 }
64 }
65
66 static const char *get_key_type(int type)
67 {
68 switch (type) {
69 case UBIFS_INO_KEY:
70 return "inode";
71 case UBIFS_DENT_KEY:
72 return "direntry";
73 case UBIFS_XENT_KEY:
74 return "xentry";
75 case UBIFS_DATA_KEY:
76 return "data";
77 case UBIFS_TRUN_KEY:
78 return "truncate";
79 default:
80 return "unknown/invalid key";
81 }
82 }
83
84 static const char *get_dent_type(int type)
85 {
86 switch (type) {
87 case UBIFS_ITYPE_REG:
88 return "file";
89 case UBIFS_ITYPE_DIR:
90 return "dir";
91 case UBIFS_ITYPE_LNK:
92 return "symlink";
93 case UBIFS_ITYPE_BLK:
94 return "blkdev";
95 case UBIFS_ITYPE_CHR:
96 return "char dev";
97 case UBIFS_ITYPE_FIFO:
98 return "fifo";
99 case UBIFS_ITYPE_SOCK:
100 return "socket";
101 default:
102 return "unknown/invalid type";
103 }
104 }
105
106 static void sprintf_key(const struct ubifs_info *c, const union ubifs_key *key,
107 char *buffer)
108 {
109 char *p = buffer;
110 int type = key_type(c, key);
111
112 if (c->key_fmt == UBIFS_SIMPLE_KEY_FMT) {
113 switch (type) {
114 case UBIFS_INO_KEY:
115 sprintf(p, "(%lu, %s)", (unsigned long)key_inum(c, key),
116 get_key_type(type));
117 break;
118 case UBIFS_DENT_KEY:
119 case UBIFS_XENT_KEY:
120 sprintf(p, "(%lu, %s, %#08x)",
121 (unsigned long)key_inum(c, key),
122 get_key_type(type), key_hash(c, key));
123 break;
124 case UBIFS_DATA_KEY:
125 sprintf(p, "(%lu, %s, %u)",
126 (unsigned long)key_inum(c, key),
127 get_key_type(type), key_block(c, key));
128 break;
129 case UBIFS_TRUN_KEY:
130 sprintf(p, "(%lu, %s)",
131 (unsigned long)key_inum(c, key),
132 get_key_type(type));
133 break;
134 default:
135 sprintf(p, "(bad key type: %#08x, %#08x)",
136 key->u32[0], key->u32[1]);
137 }
138 } else
139 sprintf(p, "bad key format %d", c->key_fmt);
140 }
141
142 const char *dbg_key_str0(const struct ubifs_info *c, const union ubifs_key *key)
143 {
144 /* dbg_lock must be held */
145 sprintf_key(c, key, dbg_key_buf0);
146 return dbg_key_buf0;
147 }
148
149 const char *dbg_key_str1(const struct ubifs_info *c, const union ubifs_key *key)
150 {
151 /* dbg_lock must be held */
152 sprintf_key(c, key, dbg_key_buf1);
153 return dbg_key_buf1;
154 }
155
156 const char *dbg_ntype(int type)
157 {
158 switch (type) {
159 case UBIFS_PAD_NODE:
160 return "padding node";
161 case UBIFS_SB_NODE:
162 return "superblock node";
163 case UBIFS_MST_NODE:
164 return "master node";
165 case UBIFS_REF_NODE:
166 return "reference node";
167 case UBIFS_INO_NODE:
168 return "inode node";
169 case UBIFS_DENT_NODE:
170 return "direntry node";
171 case UBIFS_XENT_NODE:
172 return "xentry node";
173 case UBIFS_DATA_NODE:
174 return "data node";
175 case UBIFS_TRUN_NODE:
176 return "truncate node";
177 case UBIFS_IDX_NODE:
178 return "indexing node";
179 case UBIFS_CS_NODE:
180 return "commit start node";
181 case UBIFS_ORPH_NODE:
182 return "orphan node";
183 default:
184 return "unknown node";
185 }
186 }
187
188 static const char *dbg_gtype(int type)
189 {
190 switch (type) {
191 case UBIFS_NO_NODE_GROUP:
192 return "no node group";
193 case UBIFS_IN_NODE_GROUP:
194 return "in node group";
195 case UBIFS_LAST_OF_NODE_GROUP:
196 return "last of node group";
197 default:
198 return "unknown";
199 }
200 }
201
202 const char *dbg_cstate(int cmt_state)
203 {
204 switch (cmt_state) {
205 case COMMIT_RESTING:
206 return "commit resting";
207 case COMMIT_BACKGROUND:
208 return "background commit requested";
209 case COMMIT_REQUIRED:
210 return "commit required";
211 case COMMIT_RUNNING_BACKGROUND:
212 return "BACKGROUND commit running";
213 case COMMIT_RUNNING_REQUIRED:
214 return "commit running and required";
215 case COMMIT_BROKEN:
216 return "broken commit";
217 default:
218 return "unknown commit state";
219 }
220 }
221
222 const char *dbg_jhead(int jhead)
223 {
224 switch (jhead) {
225 case GCHD:
226 return "0 (GC)";
227 case BASEHD:
228 return "1 (base)";
229 case DATAHD:
230 return "2 (data)";
231 default:
232 return "unknown journal head";
233 }
234 }
235
236 static void dump_ch(const struct ubifs_ch *ch)
237 {
238 printk(KERN_DEBUG "\tmagic %#x\n", le32_to_cpu(ch->magic));
239 printk(KERN_DEBUG "\tcrc %#x\n", le32_to_cpu(ch->crc));
240 printk(KERN_DEBUG "\tnode_type %d (%s)\n", ch->node_type,
241 dbg_ntype(ch->node_type));
242 printk(KERN_DEBUG "\tgroup_type %d (%s)\n", ch->group_type,
243 dbg_gtype(ch->group_type));
244 printk(KERN_DEBUG "\tsqnum %llu\n",
245 (unsigned long long)le64_to_cpu(ch->sqnum));
246 printk(KERN_DEBUG "\tlen %u\n", le32_to_cpu(ch->len));
247 }
248
249 void dbg_dump_inode(struct ubifs_info *c, const struct inode *inode)
250 {
251 const struct ubifs_inode *ui = ubifs_inode(inode);
252 struct qstr nm = { .name = NULL };
253 union ubifs_key key;
254 struct ubifs_dent_node *dent, *pdent = NULL;
255 int count = 2;
256
257 printk(KERN_DEBUG "Dump in-memory inode:");
258 printk(KERN_DEBUG "\tinode %lu\n", inode->i_ino);
259 printk(KERN_DEBUG "\tsize %llu\n",
260 (unsigned long long)i_size_read(inode));
261 printk(KERN_DEBUG "\tnlink %u\n", inode->i_nlink);
262 printk(KERN_DEBUG "\tuid %u\n", (unsigned int)inode->i_uid);
263 printk(KERN_DEBUG "\tgid %u\n", (unsigned int)inode->i_gid);
264 printk(KERN_DEBUG "\tatime %u.%u\n",
265 (unsigned int)inode->i_atime.tv_sec,
266 (unsigned int)inode->i_atime.tv_nsec);
267 printk(KERN_DEBUG "\tmtime %u.%u\n",
268 (unsigned int)inode->i_mtime.tv_sec,
269 (unsigned int)inode->i_mtime.tv_nsec);
270 printk(KERN_DEBUG "\tctime %u.%u\n",
271 (unsigned int)inode->i_ctime.tv_sec,
272 (unsigned int)inode->i_ctime.tv_nsec);
273 printk(KERN_DEBUG "\tcreat_sqnum %llu\n", ui->creat_sqnum);
274 printk(KERN_DEBUG "\txattr_size %u\n", ui->xattr_size);
275 printk(KERN_DEBUG "\txattr_cnt %u\n", ui->xattr_cnt);
276 printk(KERN_DEBUG "\txattr_names %u\n", ui->xattr_names);
277 printk(KERN_DEBUG "\tdirty %u\n", ui->dirty);
278 printk(KERN_DEBUG "\txattr %u\n", ui->xattr);
279 printk(KERN_DEBUG "\tbulk_read %u\n", ui->xattr);
280 printk(KERN_DEBUG "\tsynced_i_size %llu\n",
281 (unsigned long long)ui->synced_i_size);
282 printk(KERN_DEBUG "\tui_size %llu\n",
283 (unsigned long long)ui->ui_size);
284 printk(KERN_DEBUG "\tflags %d\n", ui->flags);
285 printk(KERN_DEBUG "\tcompr_type %d\n", ui->compr_type);
286 printk(KERN_DEBUG "\tlast_page_read %lu\n", ui->last_page_read);
287 printk(KERN_DEBUG "\tread_in_a_row %lu\n", ui->read_in_a_row);
288 printk(KERN_DEBUG "\tdata_len %d\n", ui->data_len);
289
290 if (!S_ISDIR(inode->i_mode))
291 return;
292
293 printk(KERN_DEBUG "List of directory entries:\n");
294 ubifs_assert(!mutex_is_locked(&c->tnc_mutex));
295
296 lowest_dent_key(c, &key, inode->i_ino);
297 while (1) {
298 dent = ubifs_tnc_next_ent(c, &key, &nm);
299 if (IS_ERR(dent)) {
300 if (PTR_ERR(dent) != -ENOENT)
301 printk(KERN_DEBUG "error %ld\n", PTR_ERR(dent));
302 break;
303 }
304
305 printk(KERN_DEBUG "\t%d: %s (%s)\n",
306 count++, dent->name, get_dent_type(dent->type));
307
308 nm.name = dent->name;
309 nm.len = le16_to_cpu(dent->nlen);
310 kfree(pdent);
311 pdent = dent;
312 key_read(c, &dent->key, &key);
313 }
314 kfree(pdent);
315 }
316
317 void dbg_dump_node(const struct ubifs_info *c, const void *node)
318 {
319 int i, n;
320 union ubifs_key key;
321 const struct ubifs_ch *ch = node;
322
323 if (dbg_is_tst_rcvry(c))
324 return;
325
326 /* If the magic is incorrect, just hexdump the first bytes */
327 if (le32_to_cpu(ch->magic) != UBIFS_NODE_MAGIC) {
328 printk(KERN_DEBUG "Not a node, first %zu bytes:", UBIFS_CH_SZ);
329 print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, 32, 1,
330 (void *)node, UBIFS_CH_SZ, 1);
331 return;
332 }
333
334 spin_lock(&dbg_lock);
335 dump_ch(node);
336
337 switch (ch->node_type) {
338 case UBIFS_PAD_NODE:
339 {
340 const struct ubifs_pad_node *pad = node;
341
342 printk(KERN_DEBUG "\tpad_len %u\n",
343 le32_to_cpu(pad->pad_len));
344 break;
345 }
346 case UBIFS_SB_NODE:
347 {
348 const struct ubifs_sb_node *sup = node;
349 unsigned int sup_flags = le32_to_cpu(sup->flags);
350
351 printk(KERN_DEBUG "\tkey_hash %d (%s)\n",
352 (int)sup->key_hash, get_key_hash(sup->key_hash));
353 printk(KERN_DEBUG "\tkey_fmt %d (%s)\n",
354 (int)sup->key_fmt, get_key_fmt(sup->key_fmt));
355 printk(KERN_DEBUG "\tflags %#x\n", sup_flags);
356 printk(KERN_DEBUG "\t big_lpt %u\n",
357 !!(sup_flags & UBIFS_FLG_BIGLPT));
358 printk(KERN_DEBUG "\t space_fixup %u\n",
359 !!(sup_flags & UBIFS_FLG_SPACE_FIXUP));
360 printk(KERN_DEBUG "\tmin_io_size %u\n",
361 le32_to_cpu(sup->min_io_size));
362 printk(KERN_DEBUG "\tleb_size %u\n",
363 le32_to_cpu(sup->leb_size));
364 printk(KERN_DEBUG "\tleb_cnt %u\n",
365 le32_to_cpu(sup->leb_cnt));
366 printk(KERN_DEBUG "\tmax_leb_cnt %u\n",
367 le32_to_cpu(sup->max_leb_cnt));
368 printk(KERN_DEBUG "\tmax_bud_bytes %llu\n",
369 (unsigned long long)le64_to_cpu(sup->max_bud_bytes));
370 printk(KERN_DEBUG "\tlog_lebs %u\n",
371 le32_to_cpu(sup->log_lebs));
372 printk(KERN_DEBUG "\tlpt_lebs %u\n",
373 le32_to_cpu(sup->lpt_lebs));
374 printk(KERN_DEBUG "\torph_lebs %u\n",
375 le32_to_cpu(sup->orph_lebs));
376 printk(KERN_DEBUG "\tjhead_cnt %u\n",
377 le32_to_cpu(sup->jhead_cnt));
378 printk(KERN_DEBUG "\tfanout %u\n",
379 le32_to_cpu(sup->fanout));
380 printk(KERN_DEBUG "\tlsave_cnt %u\n",
381 le32_to_cpu(sup->lsave_cnt));
382 printk(KERN_DEBUG "\tdefault_compr %u\n",
383 (int)le16_to_cpu(sup->default_compr));
384 printk(KERN_DEBUG "\trp_size %llu\n",
385 (unsigned long long)le64_to_cpu(sup->rp_size));
386 printk(KERN_DEBUG "\trp_uid %u\n",
387 le32_to_cpu(sup->rp_uid));
388 printk(KERN_DEBUG "\trp_gid %u\n",
389 le32_to_cpu(sup->rp_gid));
390 printk(KERN_DEBUG "\tfmt_version %u\n",
391 le32_to_cpu(sup->fmt_version));
392 printk(KERN_DEBUG "\ttime_gran %u\n",
393 le32_to_cpu(sup->time_gran));
394 printk(KERN_DEBUG "\tUUID %pUB\n",
395 sup->uuid);
396 break;
397 }
398 case UBIFS_MST_NODE:
399 {
400 const struct ubifs_mst_node *mst = node;
401
402 printk(KERN_DEBUG "\thighest_inum %llu\n",
403 (unsigned long long)le64_to_cpu(mst->highest_inum));
404 printk(KERN_DEBUG "\tcommit number %llu\n",
405 (unsigned long long)le64_to_cpu(mst->cmt_no));
406 printk(KERN_DEBUG "\tflags %#x\n",
407 le32_to_cpu(mst->flags));
408 printk(KERN_DEBUG "\tlog_lnum %u\n",
409 le32_to_cpu(mst->log_lnum));
410 printk(KERN_DEBUG "\troot_lnum %u\n",
411 le32_to_cpu(mst->root_lnum));
412 printk(KERN_DEBUG "\troot_offs %u\n",
413 le32_to_cpu(mst->root_offs));
414 printk(KERN_DEBUG "\troot_len %u\n",
415 le32_to_cpu(mst->root_len));
416 printk(KERN_DEBUG "\tgc_lnum %u\n",
417 le32_to_cpu(mst->gc_lnum));
418 printk(KERN_DEBUG "\tihead_lnum %u\n",
419 le32_to_cpu(mst->ihead_lnum));
420 printk(KERN_DEBUG "\tihead_offs %u\n",
421 le32_to_cpu(mst->ihead_offs));
422 printk(KERN_DEBUG "\tindex_size %llu\n",
423 (unsigned long long)le64_to_cpu(mst->index_size));
424 printk(KERN_DEBUG "\tlpt_lnum %u\n",
425 le32_to_cpu(mst->lpt_lnum));
426 printk(KERN_DEBUG "\tlpt_offs %u\n",
427 le32_to_cpu(mst->lpt_offs));
428 printk(KERN_DEBUG "\tnhead_lnum %u\n",
429 le32_to_cpu(mst->nhead_lnum));
430 printk(KERN_DEBUG "\tnhead_offs %u\n",
431 le32_to_cpu(mst->nhead_offs));
432 printk(KERN_DEBUG "\tltab_lnum %u\n",
433 le32_to_cpu(mst->ltab_lnum));
434 printk(KERN_DEBUG "\tltab_offs %u\n",
435 le32_to_cpu(mst->ltab_offs));
436 printk(KERN_DEBUG "\tlsave_lnum %u\n",
437 le32_to_cpu(mst->lsave_lnum));
438 printk(KERN_DEBUG "\tlsave_offs %u\n",
439 le32_to_cpu(mst->lsave_offs));
440 printk(KERN_DEBUG "\tlscan_lnum %u\n",
441 le32_to_cpu(mst->lscan_lnum));
442 printk(KERN_DEBUG "\tleb_cnt %u\n",
443 le32_to_cpu(mst->leb_cnt));
444 printk(KERN_DEBUG "\tempty_lebs %u\n",
445 le32_to_cpu(mst->empty_lebs));
446 printk(KERN_DEBUG "\tidx_lebs %u\n",
447 le32_to_cpu(mst->idx_lebs));
448 printk(KERN_DEBUG "\ttotal_free %llu\n",
449 (unsigned long long)le64_to_cpu(mst->total_free));
450 printk(KERN_DEBUG "\ttotal_dirty %llu\n",
451 (unsigned long long)le64_to_cpu(mst->total_dirty));
452 printk(KERN_DEBUG "\ttotal_used %llu\n",
453 (unsigned long long)le64_to_cpu(mst->total_used));
454 printk(KERN_DEBUG "\ttotal_dead %llu\n",
455 (unsigned long long)le64_to_cpu(mst->total_dead));
456 printk(KERN_DEBUG "\ttotal_dark %llu\n",
457 (unsigned long long)le64_to_cpu(mst->total_dark));
458 break;
459 }
460 case UBIFS_REF_NODE:
461 {
462 const struct ubifs_ref_node *ref = node;
463
464 printk(KERN_DEBUG "\tlnum %u\n",
465 le32_to_cpu(ref->lnum));
466 printk(KERN_DEBUG "\toffs %u\n",
467 le32_to_cpu(ref->offs));
468 printk(KERN_DEBUG "\tjhead %u\n",
469 le32_to_cpu(ref->jhead));
470 break;
471 }
472 case UBIFS_INO_NODE:
473 {
474 const struct ubifs_ino_node *ino = node;
475
476 key_read(c, &ino->key, &key);
477 printk(KERN_DEBUG "\tkey %s\n", DBGKEY(&key));
478 printk(KERN_DEBUG "\tcreat_sqnum %llu\n",
479 (unsigned long long)le64_to_cpu(ino->creat_sqnum));
480 printk(KERN_DEBUG "\tsize %llu\n",
481 (unsigned long long)le64_to_cpu(ino->size));
482 printk(KERN_DEBUG "\tnlink %u\n",
483 le32_to_cpu(ino->nlink));
484 printk(KERN_DEBUG "\tatime %lld.%u\n",
485 (long long)le64_to_cpu(ino->atime_sec),
486 le32_to_cpu(ino->atime_nsec));
487 printk(KERN_DEBUG "\tmtime %lld.%u\n",
488 (long long)le64_to_cpu(ino->mtime_sec),
489 le32_to_cpu(ino->mtime_nsec));
490 printk(KERN_DEBUG "\tctime %lld.%u\n",
491 (long long)le64_to_cpu(ino->ctime_sec),
492 le32_to_cpu(ino->ctime_nsec));
493 printk(KERN_DEBUG "\tuid %u\n",
494 le32_to_cpu(ino->uid));
495 printk(KERN_DEBUG "\tgid %u\n",
496 le32_to_cpu(ino->gid));
497 printk(KERN_DEBUG "\tmode %u\n",
498 le32_to_cpu(ino->mode));
499 printk(KERN_DEBUG "\tflags %#x\n",
500 le32_to_cpu(ino->flags));
501 printk(KERN_DEBUG "\txattr_cnt %u\n",
502 le32_to_cpu(ino->xattr_cnt));
503 printk(KERN_DEBUG "\txattr_size %u\n",
504 le32_to_cpu(ino->xattr_size));
505 printk(KERN_DEBUG "\txattr_names %u\n",
506 le32_to_cpu(ino->xattr_names));
507 printk(KERN_DEBUG "\tcompr_type %#x\n",
508 (int)le16_to_cpu(ino->compr_type));
509 printk(KERN_DEBUG "\tdata len %u\n",
510 le32_to_cpu(ino->data_len));
511 break;
512 }
513 case UBIFS_DENT_NODE:
514 case UBIFS_XENT_NODE:
515 {
516 const struct ubifs_dent_node *dent = node;
517 int nlen = le16_to_cpu(dent->nlen);
518
519 key_read(c, &dent->key, &key);
520 printk(KERN_DEBUG "\tkey %s\n", DBGKEY(&key));
521 printk(KERN_DEBUG "\tinum %llu\n",
522 (unsigned long long)le64_to_cpu(dent->inum));
523 printk(KERN_DEBUG "\ttype %d\n", (int)dent->type);
524 printk(KERN_DEBUG "\tnlen %d\n", nlen);
525 printk(KERN_DEBUG "\tname ");
526
527 if (nlen > UBIFS_MAX_NLEN)
528 printk(KERN_DEBUG "(bad name length, not printing, "
529 "bad or corrupted node)");
530 else {
531 for (i = 0; i < nlen && dent->name[i]; i++)
532 printk(KERN_CONT "%c", dent->name[i]);
533 }
534 printk(KERN_CONT "\n");
535
536 break;
537 }
538 case UBIFS_DATA_NODE:
539 {
540 const struct ubifs_data_node *dn = node;
541 int dlen = le32_to_cpu(ch->len) - UBIFS_DATA_NODE_SZ;
542
543 key_read(c, &dn->key, &key);
544 printk(KERN_DEBUG "\tkey %s\n", DBGKEY(&key));
545 printk(KERN_DEBUG "\tsize %u\n",
546 le32_to_cpu(dn->size));
547 printk(KERN_DEBUG "\tcompr_typ %d\n",
548 (int)le16_to_cpu(dn->compr_type));
549 printk(KERN_DEBUG "\tdata size %d\n",
550 dlen);
551 printk(KERN_DEBUG "\tdata:\n");
552 print_hex_dump(KERN_DEBUG, "\t", DUMP_PREFIX_OFFSET, 32, 1,
553 (void *)&dn->data, dlen, 0);
554 break;
555 }
556 case UBIFS_TRUN_NODE:
557 {
558 const struct ubifs_trun_node *trun = node;
559
560 printk(KERN_DEBUG "\tinum %u\n",
561 le32_to_cpu(trun->inum));
562 printk(KERN_DEBUG "\told_size %llu\n",
563 (unsigned long long)le64_to_cpu(trun->old_size));
564 printk(KERN_DEBUG "\tnew_size %llu\n",
565 (unsigned long long)le64_to_cpu(trun->new_size));
566 break;
567 }
568 case UBIFS_IDX_NODE:
569 {
570 const struct ubifs_idx_node *idx = node;
571
572 n = le16_to_cpu(idx->child_cnt);
573 printk(KERN_DEBUG "\tchild_cnt %d\n", n);
574 printk(KERN_DEBUG "\tlevel %d\n",
575 (int)le16_to_cpu(idx->level));
576 printk(KERN_DEBUG "\tBranches:\n");
577
578 for (i = 0; i < n && i < c->fanout - 1; i++) {
579 const struct ubifs_branch *br;
580
581 br = ubifs_idx_branch(c, idx, i);
582 key_read(c, &br->key, &key);
583 printk(KERN_DEBUG "\t%d: LEB %d:%d len %d key %s\n",
584 i, le32_to_cpu(br->lnum), le32_to_cpu(br->offs),
585 le32_to_cpu(br->len), DBGKEY(&key));
586 }
587 break;
588 }
589 case UBIFS_CS_NODE:
590 break;
591 case UBIFS_ORPH_NODE:
592 {
593 const struct ubifs_orph_node *orph = node;
594
595 printk(KERN_DEBUG "\tcommit number %llu\n",
596 (unsigned long long)
597 le64_to_cpu(orph->cmt_no) & LLONG_MAX);
598 printk(KERN_DEBUG "\tlast node flag %llu\n",
599 (unsigned long long)(le64_to_cpu(orph->cmt_no)) >> 63);
600 n = (le32_to_cpu(ch->len) - UBIFS_ORPH_NODE_SZ) >> 3;
601 printk(KERN_DEBUG "\t%d orphan inode numbers:\n", n);
602 for (i = 0; i < n; i++)
603 printk(KERN_DEBUG "\t ino %llu\n",
604 (unsigned long long)le64_to_cpu(orph->inos[i]));
605 break;
606 }
607 default:
608 printk(KERN_DEBUG "node type %d was not recognized\n",
609 (int)ch->node_type);
610 }
611 spin_unlock(&dbg_lock);
612 }
613
614 void dbg_dump_budget_req(const struct ubifs_budget_req *req)
615 {
616 spin_lock(&dbg_lock);
617 printk(KERN_DEBUG "Budgeting request: new_ino %d, dirtied_ino %d\n",
618 req->new_ino, req->dirtied_ino);
619 printk(KERN_DEBUG "\tnew_ino_d %d, dirtied_ino_d %d\n",
620 req->new_ino_d, req->dirtied_ino_d);
621 printk(KERN_DEBUG "\tnew_page %d, dirtied_page %d\n",
622 req->new_page, req->dirtied_page);
623 printk(KERN_DEBUG "\tnew_dent %d, mod_dent %d\n",
624 req->new_dent, req->mod_dent);
625 printk(KERN_DEBUG "\tidx_growth %d\n", req->idx_growth);
626 printk(KERN_DEBUG "\tdata_growth %d dd_growth %d\n",
627 req->data_growth, req->dd_growth);
628 spin_unlock(&dbg_lock);
629 }
630
631 void dbg_dump_lstats(const struct ubifs_lp_stats *lst)
632 {
633 spin_lock(&dbg_lock);
634 printk(KERN_DEBUG "(pid %d) Lprops statistics: empty_lebs %d, "
635 "idx_lebs %d\n", current->pid, lst->empty_lebs, lst->idx_lebs);
636 printk(KERN_DEBUG "\ttaken_empty_lebs %d, total_free %lld, "
637 "total_dirty %lld\n", lst->taken_empty_lebs, lst->total_free,
638 lst->total_dirty);
639 printk(KERN_DEBUG "\ttotal_used %lld, total_dark %lld, "
640 "total_dead %lld\n", lst->total_used, lst->total_dark,
641 lst->total_dead);
642 spin_unlock(&dbg_lock);
643 }
644
645 void dbg_dump_budg(struct ubifs_info *c, const struct ubifs_budg_info *bi)
646 {
647 int i;
648 struct rb_node *rb;
649 struct ubifs_bud *bud;
650 struct ubifs_gced_idx_leb *idx_gc;
651 long long available, outstanding, free;
652
653 spin_lock(&c->space_lock);
654 spin_lock(&dbg_lock);
655 printk(KERN_DEBUG "(pid %d) Budgeting info: data budget sum %lld, "
656 "total budget sum %lld\n", current->pid,
657 bi->data_growth + bi->dd_growth,
658 bi->data_growth + bi->dd_growth + bi->idx_growth);
659 printk(KERN_DEBUG "\tbudg_data_growth %lld, budg_dd_growth %lld, "
660 "budg_idx_growth %lld\n", bi->data_growth, bi->dd_growth,
661 bi->idx_growth);
662 printk(KERN_DEBUG "\tmin_idx_lebs %d, old_idx_sz %llu, "
663 "uncommitted_idx %lld\n", bi->min_idx_lebs, bi->old_idx_sz,
664 bi->uncommitted_idx);
665 printk(KERN_DEBUG "\tpage_budget %d, inode_budget %d, dent_budget %d\n",
666 bi->page_budget, bi->inode_budget, bi->dent_budget);
667 printk(KERN_DEBUG "\tnospace %u, nospace_rp %u\n",
668 bi->nospace, bi->nospace_rp);
669 printk(KERN_DEBUG "\tdark_wm %d, dead_wm %d, max_idx_node_sz %d\n",
670 c->dark_wm, c->dead_wm, c->max_idx_node_sz);
671
672 if (bi != &c->bi)
673 /*
674 * If we are dumping saved budgeting data, do not print
675 * additional information which is about the current state, not
676 * the old one which corresponded to the saved budgeting data.
677 */
678 goto out_unlock;
679
680 printk(KERN_DEBUG "\tfreeable_cnt %d, calc_idx_sz %lld, idx_gc_cnt %d\n",
681 c->freeable_cnt, c->calc_idx_sz, c->idx_gc_cnt);
682 printk(KERN_DEBUG "\tdirty_pg_cnt %ld, dirty_zn_cnt %ld, "
683 "clean_zn_cnt %ld\n", atomic_long_read(&c->dirty_pg_cnt),
684 atomic_long_read(&c->dirty_zn_cnt),
685 atomic_long_read(&c->clean_zn_cnt));
686 printk(KERN_DEBUG "\tgc_lnum %d, ihead_lnum %d\n",
687 c->gc_lnum, c->ihead_lnum);
688
689 /* If we are in R/O mode, journal heads do not exist */
690 if (c->jheads)
691 for (i = 0; i < c->jhead_cnt; i++)
692 printk(KERN_DEBUG "\tjhead %s\t LEB %d\n",
693 dbg_jhead(c->jheads[i].wbuf.jhead),
694 c->jheads[i].wbuf.lnum);
695 for (rb = rb_first(&c->buds); rb; rb = rb_next(rb)) {
696 bud = rb_entry(rb, struct ubifs_bud, rb);
697 printk(KERN_DEBUG "\tbud LEB %d\n", bud->lnum);
698 }
699 list_for_each_entry(bud, &c->old_buds, list)
700 printk(KERN_DEBUG "\told bud LEB %d\n", bud->lnum);
701 list_for_each_entry(idx_gc, &c->idx_gc, list)
702 printk(KERN_DEBUG "\tGC'ed idx LEB %d unmap %d\n",
703 idx_gc->lnum, idx_gc->unmap);
704 printk(KERN_DEBUG "\tcommit state %d\n", c->cmt_state);
705
706 /* Print budgeting predictions */
707 available = ubifs_calc_available(c, c->bi.min_idx_lebs);
708 outstanding = c->bi.data_growth + c->bi.dd_growth;
709 free = ubifs_get_free_space_nolock(c);
710 printk(KERN_DEBUG "Budgeting predictions:\n");
711 printk(KERN_DEBUG "\tavailable: %lld, outstanding %lld, free %lld\n",
712 available, outstanding, free);
713 out_unlock:
714 spin_unlock(&dbg_lock);
715 spin_unlock(&c->space_lock);
716 }
717
718 void dbg_dump_lprop(const struct ubifs_info *c, const struct ubifs_lprops *lp)
719 {
720 int i, spc, dark = 0, dead = 0;
721 struct rb_node *rb;
722 struct ubifs_bud *bud;
723
724 spc = lp->free + lp->dirty;
725 if (spc < c->dead_wm)
726 dead = spc;
727 else
728 dark = ubifs_calc_dark(c, spc);
729
730 if (lp->flags & LPROPS_INDEX)
731 printk(KERN_DEBUG "LEB %-7d free %-8d dirty %-8d used %-8d "
732 "free + dirty %-8d flags %#x (", lp->lnum, lp->free,
733 lp->dirty, c->leb_size - spc, spc, lp->flags);
734 else
735 printk(KERN_DEBUG "LEB %-7d free %-8d dirty %-8d used %-8d "
736 "free + dirty %-8d dark %-4d dead %-4d nodes fit %-3d "
737 "flags %#-4x (", lp->lnum, lp->free, lp->dirty,
738 c->leb_size - spc, spc, dark, dead,
739 (int)(spc / UBIFS_MAX_NODE_SZ), lp->flags);
740
741 if (lp->flags & LPROPS_TAKEN) {
742 if (lp->flags & LPROPS_INDEX)
743 printk(KERN_CONT "index, taken");
744 else
745 printk(KERN_CONT "taken");
746 } else {
747 const char *s;
748
749 if (lp->flags & LPROPS_INDEX) {
750 switch (lp->flags & LPROPS_CAT_MASK) {
751 case LPROPS_DIRTY_IDX:
752 s = "dirty index";
753 break;
754 case LPROPS_FRDI_IDX:
755 s = "freeable index";
756 break;
757 default:
758 s = "index";
759 }
760 } else {
761 switch (lp->flags & LPROPS_CAT_MASK) {
762 case LPROPS_UNCAT:
763 s = "not categorized";
764 break;
765 case LPROPS_DIRTY:
766 s = "dirty";
767 break;
768 case LPROPS_FREE:
769 s = "free";
770 break;
771 case LPROPS_EMPTY:
772 s = "empty";
773 break;
774 case LPROPS_FREEABLE:
775 s = "freeable";
776 break;
777 default:
778 s = NULL;
779 break;
780 }
781 }
782 printk(KERN_CONT "%s", s);
783 }
784
785 for (rb = rb_first((struct rb_root *)&c->buds); rb; rb = rb_next(rb)) {
786 bud = rb_entry(rb, struct ubifs_bud, rb);
787 if (bud->lnum == lp->lnum) {
788 int head = 0;
789 for (i = 0; i < c->jhead_cnt; i++) {
790 /*
791 * Note, if we are in R/O mode or in the middle
792 * of mounting/re-mounting, the write-buffers do
793 * not exist.
794 */
795 if (c->jheads &&
796 lp->lnum == c->jheads[i].wbuf.lnum) {
797 printk(KERN_CONT ", jhead %s",
798 dbg_jhead(i));
799 head = 1;
800 }
801 }
802 if (!head)
803 printk(KERN_CONT ", bud of jhead %s",
804 dbg_jhead(bud->jhead));
805 }
806 }
807 if (lp->lnum == c->gc_lnum)
808 printk(KERN_CONT ", GC LEB");
809 printk(KERN_CONT ")\n");
810 }
811
812 void dbg_dump_lprops(struct ubifs_info *c)
813 {
814 int lnum, err;
815 struct ubifs_lprops lp;
816 struct ubifs_lp_stats lst;
817
818 printk(KERN_DEBUG "(pid %d) start dumping LEB properties\n",
819 current->pid);
820 ubifs_get_lp_stats(c, &lst);
821 dbg_dump_lstats(&lst);
822
823 for (lnum = c->main_first; lnum < c->leb_cnt; lnum++) {
824 err = ubifs_read_one_lp(c, lnum, &lp);
825 if (err)
826 ubifs_err("cannot read lprops for LEB %d", lnum);
827
828 dbg_dump_lprop(c, &lp);
829 }
830 printk(KERN_DEBUG "(pid %d) finish dumping LEB properties\n",
831 current->pid);
832 }
833
834 void dbg_dump_lpt_info(struct ubifs_info *c)
835 {
836 int i;
837
838 spin_lock(&dbg_lock);
839 printk(KERN_DEBUG "(pid %d) dumping LPT information\n", current->pid);
840 printk(KERN_DEBUG "\tlpt_sz: %lld\n", c->lpt_sz);
841 printk(KERN_DEBUG "\tpnode_sz: %d\n", c->pnode_sz);
842 printk(KERN_DEBUG "\tnnode_sz: %d\n", c->nnode_sz);
843 printk(KERN_DEBUG "\tltab_sz: %d\n", c->ltab_sz);
844 printk(KERN_DEBUG "\tlsave_sz: %d\n", c->lsave_sz);
845 printk(KERN_DEBUG "\tbig_lpt: %d\n", c->big_lpt);
846 printk(KERN_DEBUG "\tlpt_hght: %d\n", c->lpt_hght);
847 printk(KERN_DEBUG "\tpnode_cnt: %d\n", c->pnode_cnt);
848 printk(KERN_DEBUG "\tnnode_cnt: %d\n", c->nnode_cnt);
849 printk(KERN_DEBUG "\tdirty_pn_cnt: %d\n", c->dirty_pn_cnt);
850 printk(KERN_DEBUG "\tdirty_nn_cnt: %d\n", c->dirty_nn_cnt);
851 printk(KERN_DEBUG "\tlsave_cnt: %d\n", c->lsave_cnt);
852 printk(KERN_DEBUG "\tspace_bits: %d\n", c->space_bits);
853 printk(KERN_DEBUG "\tlpt_lnum_bits: %d\n", c->lpt_lnum_bits);
854 printk(KERN_DEBUG "\tlpt_offs_bits: %d\n", c->lpt_offs_bits);
855 printk(KERN_DEBUG "\tlpt_spc_bits: %d\n", c->lpt_spc_bits);
856 printk(KERN_DEBUG "\tpcnt_bits: %d\n", c->pcnt_bits);
857 printk(KERN_DEBUG "\tlnum_bits: %d\n", c->lnum_bits);
858 printk(KERN_DEBUG "\tLPT root is at %d:%d\n", c->lpt_lnum, c->lpt_offs);
859 printk(KERN_DEBUG "\tLPT head is at %d:%d\n",
860 c->nhead_lnum, c->nhead_offs);
861 printk(KERN_DEBUG "\tLPT ltab is at %d:%d\n",
862 c->ltab_lnum, c->ltab_offs);
863 if (c->big_lpt)
864 printk(KERN_DEBUG "\tLPT lsave is at %d:%d\n",
865 c->lsave_lnum, c->lsave_offs);
866 for (i = 0; i < c->lpt_lebs; i++)
867 printk(KERN_DEBUG "\tLPT LEB %d free %d dirty %d tgc %d "
868 "cmt %d\n", i + c->lpt_first, c->ltab[i].free,
869 c->ltab[i].dirty, c->ltab[i].tgc, c->ltab[i].cmt);
870 spin_unlock(&dbg_lock);
871 }
872
873 void dbg_dump_sleb(const struct ubifs_info *c,
874 const struct ubifs_scan_leb *sleb, int offs)
875 {
876 struct ubifs_scan_node *snod;
877
878 printk(KERN_DEBUG "(pid %d) start dumping scanned data from LEB %d:%d\n",
879 current->pid, sleb->lnum, offs);
880
881 list_for_each_entry(snod, &sleb->nodes, list) {
882 cond_resched();
883 printk(KERN_DEBUG "Dumping node at LEB %d:%d len %d\n", sleb->lnum,
884 snod->offs, snod->len);
885 dbg_dump_node(c, snod->node);
886 }
887 }
888
889 void dbg_dump_leb(const struct ubifs_info *c, int lnum)
890 {
891 struct ubifs_scan_leb *sleb;
892 struct ubifs_scan_node *snod;
893 void *buf;
894
895 if (dbg_is_tst_rcvry(c))
896 return;
897
898 printk(KERN_DEBUG "(pid %d) start dumping LEB %d\n",
899 current->pid, lnum);
900
901 buf = __vmalloc(c->leb_size, GFP_NOFS, PAGE_KERNEL);
902 if (!buf) {
903 ubifs_err("cannot allocate memory for dumping LEB %d", lnum);
904 return;
905 }
906
907 sleb = ubifs_scan(c, lnum, 0, buf, 0);
908 if (IS_ERR(sleb)) {
909 ubifs_err("scan error %d", (int)PTR_ERR(sleb));
910 goto out;
911 }
912
913 printk(KERN_DEBUG "LEB %d has %d nodes ending at %d\n", lnum,
914 sleb->nodes_cnt, sleb->endpt);
915
916 list_for_each_entry(snod, &sleb->nodes, list) {
917 cond_resched();
918 printk(KERN_DEBUG "Dumping node at LEB %d:%d len %d\n", lnum,
919 snod->offs, snod->len);
920 dbg_dump_node(c, snod->node);
921 }
922
923 printk(KERN_DEBUG "(pid %d) finish dumping LEB %d\n",
924 current->pid, lnum);
925 ubifs_scan_destroy(sleb);
926
927 out:
928 vfree(buf);
929 return;
930 }
931
932 void dbg_dump_znode(const struct ubifs_info *c,
933 const struct ubifs_znode *znode)
934 {
935 int n;
936 const struct ubifs_zbranch *zbr;
937
938 spin_lock(&dbg_lock);
939 if (znode->parent)
940 zbr = &znode->parent->zbranch[znode->iip];
941 else
942 zbr = &c->zroot;
943
944 printk(KERN_DEBUG "znode %p, LEB %d:%d len %d parent %p iip %d level %d"
945 " child_cnt %d flags %lx\n", znode, zbr->lnum, zbr->offs,
946 zbr->len, znode->parent, znode->iip, znode->level,
947 znode->child_cnt, znode->flags);
948
949 if (znode->child_cnt <= 0 || znode->child_cnt > c->fanout) {
950 spin_unlock(&dbg_lock);
951 return;
952 }
953
954 printk(KERN_DEBUG "zbranches:\n");
955 for (n = 0; n < znode->child_cnt; n++) {
956 zbr = &znode->zbranch[n];
957 if (znode->level > 0)
958 printk(KERN_DEBUG "\t%d: znode %p LEB %d:%d len %d key "
959 "%s\n", n, zbr->znode, zbr->lnum,
960 zbr->offs, zbr->len,
961 DBGKEY(&zbr->key));
962 else
963 printk(KERN_DEBUG "\t%d: LNC %p LEB %d:%d len %d key "
964 "%s\n", n, zbr->znode, zbr->lnum,
965 zbr->offs, zbr->len,
966 DBGKEY(&zbr->key));
967 }
968 spin_unlock(&dbg_lock);
969 }
970
971 void dbg_dump_heap(struct ubifs_info *c, struct ubifs_lpt_heap *heap, int cat)
972 {
973 int i;
974
975 printk(KERN_DEBUG "(pid %d) start dumping heap cat %d (%d elements)\n",
976 current->pid, cat, heap->cnt);
977 for (i = 0; i < heap->cnt; i++) {
978 struct ubifs_lprops *lprops = heap->arr[i];
979
980 printk(KERN_DEBUG "\t%d. LEB %d hpos %d free %d dirty %d "
981 "flags %d\n", i, lprops->lnum, lprops->hpos,
982 lprops->free, lprops->dirty, lprops->flags);
983 }
984 printk(KERN_DEBUG "(pid %d) finish dumping heap\n", current->pid);
985 }
986
987 void dbg_dump_pnode(struct ubifs_info *c, struct ubifs_pnode *pnode,
988 struct ubifs_nnode *parent, int iip)
989 {
990 int i;
991
992 printk(KERN_DEBUG "(pid %d) dumping pnode:\n", current->pid);
993 printk(KERN_DEBUG "\taddress %zx parent %zx cnext %zx\n",
994 (size_t)pnode, (size_t)parent, (size_t)pnode->cnext);
995 printk(KERN_DEBUG "\tflags %lu iip %d level %d num %d\n",
996 pnode->flags, iip, pnode->level, pnode->num);
997 for (i = 0; i < UBIFS_LPT_FANOUT; i++) {
998 struct ubifs_lprops *lp = &pnode->lprops[i];
999
1000 printk(KERN_DEBUG "\t%d: free %d dirty %d flags %d lnum %d\n",
1001 i, lp->free, lp->dirty, lp->flags, lp->lnum);
1002 }
1003 }
1004
1005 void dbg_dump_tnc(struct ubifs_info *c)
1006 {
1007 struct ubifs_znode *znode;
1008 int level;
1009
1010 printk(KERN_DEBUG "\n");
1011 printk(KERN_DEBUG "(pid %d) start dumping TNC tree\n", current->pid);
1012 znode = ubifs_tnc_levelorder_next(c->zroot.znode, NULL);
1013 level = znode->level;
1014 printk(KERN_DEBUG "== Level %d ==\n", level);
1015 while (znode) {
1016 if (level != znode->level) {
1017 level = znode->level;
1018 printk(KERN_DEBUG "== Level %d ==\n", level);
1019 }
1020 dbg_dump_znode(c, znode);
1021 znode = ubifs_tnc_levelorder_next(c->zroot.znode, znode);
1022 }
1023 printk(KERN_DEBUG "(pid %d) finish dumping TNC tree\n", current->pid);
1024 }
1025
1026 static int dump_znode(struct ubifs_info *c, struct ubifs_znode *znode,
1027 void *priv)
1028 {
1029 dbg_dump_znode(c, znode);
1030 return 0;
1031 }
1032
1033 /**
1034 * dbg_dump_index - dump the on-flash index.
1035 * @c: UBIFS file-system description object
1036 *
1037 * This function dumps whole UBIFS indexing B-tree, unlike 'dbg_dump_tnc()'
1038 * which dumps only in-memory znodes and does not read znodes which from flash.
1039 */
1040 void dbg_dump_index(struct ubifs_info *c)
1041 {
1042 dbg_walk_index(c, NULL, dump_znode, NULL);
1043 }
1044
1045 /**
1046 * dbg_save_space_info - save information about flash space.
1047 * @c: UBIFS file-system description object
1048 *
1049 * This function saves information about UBIFS free space, dirty space, etc, in
1050 * order to check it later.
1051 */
1052 void dbg_save_space_info(struct ubifs_info *c)
1053 {
1054 struct ubifs_debug_info *d = c->dbg;
1055 int freeable_cnt;
1056
1057 spin_lock(&c->space_lock);
1058 memcpy(&d->saved_lst, &c->lst, sizeof(struct ubifs_lp_stats));
1059 memcpy(&d->saved_bi, &c->bi, sizeof(struct ubifs_budg_info));
1060 d->saved_idx_gc_cnt = c->idx_gc_cnt;
1061
1062 /*
1063 * We use a dirty hack here and zero out @c->freeable_cnt, because it
1064 * affects the free space calculations, and UBIFS might not know about
1065 * all freeable eraseblocks. Indeed, we know about freeable eraseblocks
1066 * only when we read their lprops, and we do this only lazily, upon the
1067 * need. So at any given point of time @c->freeable_cnt might be not
1068 * exactly accurate.
1069 *
1070 * Just one example about the issue we hit when we did not zero
1071 * @c->freeable_cnt.
1072 * 1. The file-system is mounted R/O, c->freeable_cnt is %0. We save the
1073 * amount of free space in @d->saved_free
1074 * 2. We re-mount R/W, which makes UBIFS to read the "lsave"
1075 * information from flash, where we cache LEBs from various
1076 * categories ('ubifs_remount_fs()' -> 'ubifs_lpt_init()'
1077 * -> 'lpt_init_wr()' -> 'read_lsave()' -> 'ubifs_lpt_lookup()'
1078 * -> 'ubifs_get_pnode()' -> 'update_cats()'
1079 * -> 'ubifs_add_to_cat()').
1080 * 3. Lsave contains a freeable eraseblock, and @c->freeable_cnt
1081 * becomes %1.
1082 * 4. We calculate the amount of free space when the re-mount is
1083 * finished in 'dbg_check_space_info()' and it does not match
1084 * @d->saved_free.
1085 */
1086 freeable_cnt = c->freeable_cnt;
1087 c->freeable_cnt = 0;
1088 d->saved_free = ubifs_get_free_space_nolock(c);
1089 c->freeable_cnt = freeable_cnt;
1090 spin_unlock(&c->space_lock);
1091 }
1092
1093 /**
1094 * dbg_check_space_info - check flash space information.
1095 * @c: UBIFS file-system description object
1096 *
1097 * This function compares current flash space information with the information
1098 * which was saved when the 'dbg_save_space_info()' function was called.
1099 * Returns zero if the information has not changed, and %-EINVAL it it has
1100 * changed.
1101 */
1102 int dbg_check_space_info(struct ubifs_info *c)
1103 {
1104 struct ubifs_debug_info *d = c->dbg;
1105 struct ubifs_lp_stats lst;
1106 long long free;
1107 int freeable_cnt;
1108
1109 spin_lock(&c->space_lock);
1110 freeable_cnt = c->freeable_cnt;
1111 c->freeable_cnt = 0;
1112 free = ubifs_get_free_space_nolock(c);
1113 c->freeable_cnt = freeable_cnt;
1114 spin_unlock(&c->space_lock);
1115
1116 if (free != d->saved_free) {
1117 ubifs_err("free space changed from %lld to %lld",
1118 d->saved_free, free);
1119 goto out;
1120 }
1121
1122 return 0;
1123
1124 out:
1125 ubifs_msg("saved lprops statistics dump");
1126 dbg_dump_lstats(&d->saved_lst);
1127 ubifs_msg("saved budgeting info dump");
1128 dbg_dump_budg(c, &d->saved_bi);
1129 ubifs_msg("saved idx_gc_cnt %d", d->saved_idx_gc_cnt);
1130 ubifs_msg("current lprops statistics dump");
1131 ubifs_get_lp_stats(c, &lst);
1132 dbg_dump_lstats(&lst);
1133 ubifs_msg("current budgeting info dump");
1134 dbg_dump_budg(c, &c->bi);
1135 dump_stack();
1136 return -EINVAL;
1137 }
1138
1139 /**
1140 * dbg_check_synced_i_size - check synchronized inode size.
1141 * @c: UBIFS file-system description object
1142 * @inode: inode to check
1143 *
1144 * If inode is clean, synchronized inode size has to be equivalent to current
1145 * inode size. This function has to be called only for locked inodes (@i_mutex
1146 * has to be locked). Returns %0 if synchronized inode size if correct, and
1147 * %-EINVAL if not.
1148 */
1149 int dbg_check_synced_i_size(const struct ubifs_info *c, struct inode *inode)
1150 {
1151 int err = 0;
1152 struct ubifs_inode *ui = ubifs_inode(inode);
1153
1154 if (!dbg_is_chk_gen(c))
1155 return 0;
1156 if (!S_ISREG(inode->i_mode))
1157 return 0;
1158
1159 mutex_lock(&ui->ui_mutex);
1160 spin_lock(&ui->ui_lock);
1161 if (ui->ui_size != ui->synced_i_size && !ui->dirty) {
1162 ubifs_err("ui_size is %lld, synced_i_size is %lld, but inode "
1163 "is clean", ui->ui_size, ui->synced_i_size);
1164 ubifs_err("i_ino %lu, i_mode %#x, i_size %lld", inode->i_ino,
1165 inode->i_mode, i_size_read(inode));
1166 dbg_dump_stack();
1167 err = -EINVAL;
1168 }
1169 spin_unlock(&ui->ui_lock);
1170 mutex_unlock(&ui->ui_mutex);
1171 return err;
1172 }
1173
1174 /*
1175 * dbg_check_dir - check directory inode size and link count.
1176 * @c: UBIFS file-system description object
1177 * @dir: the directory to calculate size for
1178 * @size: the result is returned here
1179 *
1180 * This function makes sure that directory size and link count are correct.
1181 * Returns zero in case of success and a negative error code in case of
1182 * failure.
1183 *
1184 * Note, it is good idea to make sure the @dir->i_mutex is locked before
1185 * calling this function.
1186 */
1187 int dbg_check_dir(struct ubifs_info *c, const struct inode *dir)
1188 {
1189 unsigned int nlink = 2;
1190 union ubifs_key key;
1191 struct ubifs_dent_node *dent, *pdent = NULL;
1192 struct qstr nm = { .name = NULL };
1193 loff_t size = UBIFS_INO_NODE_SZ;
1194
1195 if (!dbg_is_chk_gen(c))
1196 return 0;
1197
1198 if (!S_ISDIR(dir->i_mode))
1199 return 0;
1200
1201 lowest_dent_key(c, &key, dir->i_ino);
1202 while (1) {
1203 int err;
1204
1205 dent = ubifs_tnc_next_ent(c, &key, &nm);
1206 if (IS_ERR(dent)) {
1207 err = PTR_ERR(dent);
1208 if (err == -ENOENT)
1209 break;
1210 return err;
1211 }
1212
1213 nm.name = dent->name;
1214 nm.len = le16_to_cpu(dent->nlen);
1215 size += CALC_DENT_SIZE(nm.len);
1216 if (dent->type == UBIFS_ITYPE_DIR)
1217 nlink += 1;
1218 kfree(pdent);
1219 pdent = dent;
1220 key_read(c, &dent->key, &key);
1221 }
1222 kfree(pdent);
1223
1224 if (i_size_read(dir) != size) {
1225 ubifs_err("directory inode %lu has size %llu, "
1226 "but calculated size is %llu", dir->i_ino,
1227 (unsigned long long)i_size_read(dir),
1228 (unsigned long long)size);
1229 dbg_dump_inode(c, dir);
1230 dump_stack();
1231 return -EINVAL;
1232 }
1233 if (dir->i_nlink != nlink) {
1234 ubifs_err("directory inode %lu has nlink %u, but calculated "
1235 "nlink is %u", dir->i_ino, dir->i_nlink, nlink);
1236 dbg_dump_inode(c, dir);
1237 dump_stack();
1238 return -EINVAL;
1239 }
1240
1241 return 0;
1242 }
1243
1244 /**
1245 * dbg_check_key_order - make sure that colliding keys are properly ordered.
1246 * @c: UBIFS file-system description object
1247 * @zbr1: first zbranch
1248 * @zbr2: following zbranch
1249 *
1250 * In UBIFS indexing B-tree colliding keys has to be sorted in binary order of
1251 * names of the direntries/xentries which are referred by the keys. This
1252 * function reads direntries/xentries referred by @zbr1 and @zbr2 and makes
1253 * sure the name of direntry/xentry referred by @zbr1 is less than
1254 * direntry/xentry referred by @zbr2. Returns zero if this is true, %1 if not,
1255 * and a negative error code in case of failure.
1256 */
1257 static int dbg_check_key_order(struct ubifs_info *c, struct ubifs_zbranch *zbr1,
1258 struct ubifs_zbranch *zbr2)
1259 {
1260 int err, nlen1, nlen2, cmp;
1261 struct ubifs_dent_node *dent1, *dent2;
1262 union ubifs_key key;
1263
1264 ubifs_assert(!keys_cmp(c, &zbr1->key, &zbr2->key));
1265 dent1 = kmalloc(UBIFS_MAX_DENT_NODE_SZ, GFP_NOFS);
1266 if (!dent1)
1267 return -ENOMEM;
1268 dent2 = kmalloc(UBIFS_MAX_DENT_NODE_SZ, GFP_NOFS);
1269 if (!dent2) {
1270 err = -ENOMEM;
1271 goto out_free;
1272 }
1273
1274 err = ubifs_tnc_read_node(c, zbr1, dent1);
1275 if (err)
1276 goto out_free;
1277 err = ubifs_validate_entry(c, dent1);
1278 if (err)
1279 goto out_free;
1280
1281 err = ubifs_tnc_read_node(c, zbr2, dent2);
1282 if (err)
1283 goto out_free;
1284 err = ubifs_validate_entry(c, dent2);
1285 if (err)
1286 goto out_free;
1287
1288 /* Make sure node keys are the same as in zbranch */
1289 err = 1;
1290 key_read(c, &dent1->key, &key);
1291 if (keys_cmp(c, &zbr1->key, &key)) {
1292 dbg_err("1st entry at %d:%d has key %s", zbr1->lnum,
1293 zbr1->offs, DBGKEY(&key));
1294 dbg_err("but it should have key %s according to tnc",
1295 DBGKEY(&zbr1->key));
1296 dbg_dump_node(c, dent1);
1297 goto out_free;
1298 }
1299
1300 key_read(c, &dent2->key, &key);
1301 if (keys_cmp(c, &zbr2->key, &key)) {
1302 dbg_err("2nd entry at %d:%d has key %s", zbr1->lnum,
1303 zbr1->offs, DBGKEY(&key));
1304 dbg_err("but it should have key %s according to tnc",
1305 DBGKEY(&zbr2->key));
1306 dbg_dump_node(c, dent2);
1307 goto out_free;
1308 }
1309
1310 nlen1 = le16_to_cpu(dent1->nlen);
1311 nlen2 = le16_to_cpu(dent2->nlen);
1312
1313 cmp = memcmp(dent1->name, dent2->name, min_t(int, nlen1, nlen2));
1314 if (cmp < 0 || (cmp == 0 && nlen1 < nlen2)) {
1315 err = 0;
1316 goto out_free;
1317 }
1318 if (cmp == 0 && nlen1 == nlen2)
1319 dbg_err("2 xent/dent nodes with the same name");
1320 else
1321 dbg_err("bad order of colliding key %s",
1322 DBGKEY(&key));
1323
1324 ubifs_msg("first node at %d:%d\n", zbr1->lnum, zbr1->offs);
1325 dbg_dump_node(c, dent1);
1326 ubifs_msg("second node at %d:%d\n", zbr2->lnum, zbr2->offs);
1327 dbg_dump_node(c, dent2);
1328
1329 out_free:
1330 kfree(dent2);
1331 kfree(dent1);
1332 return err;
1333 }
1334
1335 /**
1336 * dbg_check_znode - check if znode is all right.
1337 * @c: UBIFS file-system description object
1338 * @zbr: zbranch which points to this znode
1339 *
1340 * This function makes sure that znode referred to by @zbr is all right.
1341 * Returns zero if it is, and %-EINVAL if it is not.
1342 */
1343 static int dbg_check_znode(struct ubifs_info *c, struct ubifs_zbranch *zbr)
1344 {
1345 struct ubifs_znode *znode = zbr->znode;
1346 struct ubifs_znode *zp = znode->parent;
1347 int n, err, cmp;
1348
1349 if (znode->child_cnt <= 0 || znode->child_cnt > c->fanout) {
1350 err = 1;
1351 goto out;
1352 }
1353 if (znode->level < 0) {
1354 err = 2;
1355 goto out;
1356 }
1357 if (znode->iip < 0 || znode->iip >= c->fanout) {
1358 err = 3;
1359 goto out;
1360 }
1361
1362 if (zbr->len == 0)
1363 /* Only dirty zbranch may have no on-flash nodes */
1364 if (!ubifs_zn_dirty(znode)) {
1365 err = 4;
1366 goto out;
1367 }
1368
1369 if (ubifs_zn_dirty(znode)) {
1370 /*
1371 * If znode is dirty, its parent has to be dirty as well. The
1372 * order of the operation is important, so we have to have
1373 * memory barriers.
1374 */
1375 smp_mb();
1376 if (zp && !ubifs_zn_dirty(zp)) {
1377 /*
1378 * The dirty flag is atomic and is cleared outside the
1379 * TNC mutex, so znode's dirty flag may now have
1380 * been cleared. The child is always cleared before the
1381 * parent, so we just need to check again.
1382 */
1383 smp_mb();
1384 if (ubifs_zn_dirty(znode)) {
1385 err = 5;
1386 goto out;
1387 }
1388 }
1389 }
1390
1391 if (zp) {
1392 const union ubifs_key *min, *max;
1393
1394 if (znode->level != zp->level - 1) {
1395 err = 6;
1396 goto out;
1397 }
1398
1399 /* Make sure the 'parent' pointer in our znode is correct */
1400 err = ubifs_search_zbranch(c, zp, &zbr->key, &n);
1401 if (!err) {
1402 /* This zbranch does not exist in the parent */
1403 err = 7;
1404 goto out;
1405 }
1406
1407 if (znode->iip >= zp->child_cnt) {
1408 err = 8;
1409 goto out;
1410 }
1411
1412 if (znode->iip != n) {
1413 /* This may happen only in case of collisions */
1414 if (keys_cmp(c, &zp->zbranch[n].key,
1415 &zp->zbranch[znode->iip].key)) {
1416 err = 9;
1417 goto out;
1418 }
1419 n = znode->iip;
1420 }
1421
1422 /*
1423 * Make sure that the first key in our znode is greater than or
1424 * equal to the key in the pointing zbranch.
1425 */
1426 min = &zbr->key;
1427 cmp = keys_cmp(c, min, &znode->zbranch[0].key);
1428 if (cmp == 1) {
1429 err = 10;
1430 goto out;
1431 }
1432
1433 if (n + 1 < zp->child_cnt) {
1434 max = &zp->zbranch[n + 1].key;
1435
1436 /*
1437 * Make sure the last key in our znode is less or
1438 * equivalent than the key in the zbranch which goes
1439 * after our pointing zbranch.
1440 */
1441 cmp = keys_cmp(c, max,
1442 &znode->zbranch[znode->child_cnt - 1].key);
1443 if (cmp == -1) {
1444 err = 11;
1445 goto out;
1446 }
1447 }
1448 } else {
1449 /* This may only be root znode */
1450 if (zbr != &c->zroot) {
1451 err = 12;
1452 goto out;
1453 }
1454 }
1455
1456 /*
1457 * Make sure that next key is greater or equivalent then the previous
1458 * one.
1459 */
1460 for (n = 1; n < znode->child_cnt; n++) {
1461 cmp = keys_cmp(c, &znode->zbranch[n - 1].key,
1462 &znode->zbranch[n].key);
1463 if (cmp > 0) {
1464 err = 13;
1465 goto out;
1466 }
1467 if (cmp == 0) {
1468 /* This can only be keys with colliding hash */
1469 if (!is_hash_key(c, &znode->zbranch[n].key)) {
1470 err = 14;
1471 goto out;
1472 }
1473
1474 if (znode->level != 0 || c->replaying)
1475 continue;
1476
1477 /*
1478 * Colliding keys should follow binary order of
1479 * corresponding xentry/dentry names.
1480 */
1481 err = dbg_check_key_order(c, &znode->zbranch[n - 1],
1482 &znode->zbranch[n]);
1483 if (err < 0)
1484 return err;
1485 if (err) {
1486 err = 15;
1487 goto out;
1488 }
1489 }
1490 }
1491
1492 for (n = 0; n < znode->child_cnt; n++) {
1493 if (!znode->zbranch[n].znode &&
1494 (znode->zbranch[n].lnum == 0 ||
1495 znode->zbranch[n].len == 0)) {
1496 err = 16;
1497 goto out;
1498 }
1499
1500 if (znode->zbranch[n].lnum != 0 &&
1501 znode->zbranch[n].len == 0) {
1502 err = 17;
1503 goto out;
1504 }
1505
1506 if (znode->zbranch[n].lnum == 0 &&
1507 znode->zbranch[n].len != 0) {
1508 err = 18;
1509 goto out;
1510 }
1511
1512 if (znode->zbranch[n].lnum == 0 &&
1513 znode->zbranch[n].offs != 0) {
1514 err = 19;
1515 goto out;
1516 }
1517
1518 if (znode->level != 0 && znode->zbranch[n].znode)
1519 if (znode->zbranch[n].znode->parent != znode) {
1520 err = 20;
1521 goto out;
1522 }
1523 }
1524
1525 return 0;
1526
1527 out:
1528 ubifs_err("failed, error %d", err);
1529 ubifs_msg("dump of the znode");
1530 dbg_dump_znode(c, znode);
1531 if (zp) {
1532 ubifs_msg("dump of the parent znode");
1533 dbg_dump_znode(c, zp);
1534 }
1535 dump_stack();
1536 return -EINVAL;
1537 }
1538
1539 /**
1540 * dbg_check_tnc - check TNC tree.
1541 * @c: UBIFS file-system description object
1542 * @extra: do extra checks that are possible at start commit
1543 *
1544 * This function traverses whole TNC tree and checks every znode. Returns zero
1545 * if everything is all right and %-EINVAL if something is wrong with TNC.
1546 */
1547 int dbg_check_tnc(struct ubifs_info *c, int extra)
1548 {
1549 struct ubifs_znode *znode;
1550 long clean_cnt = 0, dirty_cnt = 0;
1551 int err, last;
1552
1553 if (!dbg_is_chk_index(c))
1554 return 0;
1555
1556 ubifs_assert(mutex_is_locked(&c->tnc_mutex));
1557 if (!c->zroot.znode)
1558 return 0;
1559
1560 znode = ubifs_tnc_postorder_first(c->zroot.znode);
1561 while (1) {
1562 struct ubifs_znode *prev;
1563 struct ubifs_zbranch *zbr;
1564
1565 if (!znode->parent)
1566 zbr = &c->zroot;
1567 else
1568 zbr = &znode->parent->zbranch[znode->iip];
1569
1570 err = dbg_check_znode(c, zbr);
1571 if (err)
1572 return err;
1573
1574 if (extra) {
1575 if (ubifs_zn_dirty(znode))
1576 dirty_cnt += 1;
1577 else
1578 clean_cnt += 1;
1579 }
1580
1581 prev = znode;
1582 znode = ubifs_tnc_postorder_next(znode);
1583 if (!znode)
1584 break;
1585
1586 /*
1587 * If the last key of this znode is equivalent to the first key
1588 * of the next znode (collision), then check order of the keys.
1589 */
1590 last = prev->child_cnt - 1;
1591 if (prev->level == 0 && znode->level == 0 && !c->replaying &&
1592 !keys_cmp(c, &prev->zbranch[last].key,
1593 &znode->zbranch[0].key)) {
1594 err = dbg_check_key_order(c, &prev->zbranch[last],
1595 &znode->zbranch[0]);
1596 if (err < 0)
1597 return err;
1598 if (err) {
1599 ubifs_msg("first znode");
1600 dbg_dump_znode(c, prev);
1601 ubifs_msg("second znode");
1602 dbg_dump_znode(c, znode);
1603 return -EINVAL;
1604 }
1605 }
1606 }
1607
1608 if (extra) {
1609 if (clean_cnt != atomic_long_read(&c->clean_zn_cnt)) {
1610 ubifs_err("incorrect clean_zn_cnt %ld, calculated %ld",
1611 atomic_long_read(&c->clean_zn_cnt),
1612 clean_cnt);
1613 return -EINVAL;
1614 }
1615 if (dirty_cnt != atomic_long_read(&c->dirty_zn_cnt)) {
1616 ubifs_err("incorrect dirty_zn_cnt %ld, calculated %ld",
1617 atomic_long_read(&c->dirty_zn_cnt),
1618 dirty_cnt);
1619 return -EINVAL;
1620 }
1621 }
1622
1623 return 0;
1624 }
1625
1626 /**
1627 * dbg_walk_index - walk the on-flash index.
1628 * @c: UBIFS file-system description object
1629 * @leaf_cb: called for each leaf node
1630 * @znode_cb: called for each indexing node
1631 * @priv: private data which is passed to callbacks
1632 *
1633 * This function walks the UBIFS index and calls the @leaf_cb for each leaf
1634 * node and @znode_cb for each indexing node. Returns zero in case of success
1635 * and a negative error code in case of failure.
1636 *
1637 * It would be better if this function removed every znode it pulled to into
1638 * the TNC, so that the behavior more closely matched the non-debugging
1639 * behavior.
1640 */
1641 int dbg_walk_index(struct ubifs_info *c, dbg_leaf_callback leaf_cb,
1642 dbg_znode_callback znode_cb, void *priv)
1643 {
1644 int err;
1645 struct ubifs_zbranch *zbr;
1646 struct ubifs_znode *znode, *child;
1647
1648 mutex_lock(&c->tnc_mutex);
1649 /* If the root indexing node is not in TNC - pull it */
1650 if (!c->zroot.znode) {
1651 c->zroot.znode = ubifs_load_znode(c, &c->zroot, NULL, 0);
1652 if (IS_ERR(c->zroot.znode)) {
1653 err = PTR_ERR(c->zroot.znode);
1654 c->zroot.znode = NULL;
1655 goto out_unlock;
1656 }
1657 }
1658
1659 /*
1660 * We are going to traverse the indexing tree in the postorder manner.
1661 * Go down and find the leftmost indexing node where we are going to
1662 * start from.
1663 */
1664 znode = c->zroot.znode;
1665 while (znode->level > 0) {
1666 zbr = &znode->zbranch[0];
1667 child = zbr->znode;
1668 if (!child) {
1669 child = ubifs_load_znode(c, zbr, znode, 0);
1670 if (IS_ERR(child)) {
1671 err = PTR_ERR(child);
1672 goto out_unlock;
1673 }
1674 zbr->znode = child;
1675 }
1676
1677 znode = child;
1678 }
1679
1680 /* Iterate over all indexing nodes */
1681 while (1) {
1682 int idx;
1683
1684 cond_resched();
1685
1686 if (znode_cb) {
1687 err = znode_cb(c, znode, priv);
1688 if (err) {
1689 ubifs_err("znode checking function returned "
1690 "error %d", err);
1691 dbg_dump_znode(c, znode);
1692 goto out_dump;
1693 }
1694 }
1695 if (leaf_cb && znode->level == 0) {
1696 for (idx = 0; idx < znode->child_cnt; idx++) {
1697 zbr = &znode->zbranch[idx];
1698 err = leaf_cb(c, zbr, priv);
1699 if (err) {
1700 ubifs_err("leaf checking function "
1701 "returned error %d, for leaf "
1702 "at LEB %d:%d",
1703 err, zbr->lnum, zbr->offs);
1704 goto out_dump;
1705 }
1706 }
1707 }
1708
1709 if (!znode->parent)
1710 break;
1711
1712 idx = znode->iip + 1;
1713 znode = znode->parent;
1714 if (idx < znode->child_cnt) {
1715 /* Switch to the next index in the parent */
1716 zbr = &znode->zbranch[idx];
1717 child = zbr->znode;
1718 if (!child) {
1719 child = ubifs_load_znode(c, zbr, znode, idx);
1720 if (IS_ERR(child)) {
1721 err = PTR_ERR(child);
1722 goto out_unlock;
1723 }
1724 zbr->znode = child;
1725 }
1726 znode = child;
1727 } else
1728 /*
1729 * This is the last child, switch to the parent and
1730 * continue.
1731 */
1732 continue;
1733
1734 /* Go to the lowest leftmost znode in the new sub-tree */
1735 while (znode->level > 0) {
1736 zbr = &znode->zbranch[0];
1737 child = zbr->znode;
1738 if (!child) {
1739 child = ubifs_load_znode(c, zbr, znode, 0);
1740 if (IS_ERR(child)) {
1741 err = PTR_ERR(child);
1742 goto out_unlock;
1743 }
1744 zbr->znode = child;
1745 }
1746 znode = child;
1747 }
1748 }
1749
1750 mutex_unlock(&c->tnc_mutex);
1751 return 0;
1752
1753 out_dump:
1754 if (znode->parent)
1755 zbr = &znode->parent->zbranch[znode->iip];
1756 else
1757 zbr = &c->zroot;
1758 ubifs_msg("dump of znode at LEB %d:%d", zbr->lnum, zbr->offs);
1759 dbg_dump_znode(c, znode);
1760 out_unlock:
1761 mutex_unlock(&c->tnc_mutex);
1762 return err;
1763 }
1764
1765 /**
1766 * add_size - add znode size to partially calculated index size.
1767 * @c: UBIFS file-system description object
1768 * @znode: znode to add size for
1769 * @priv: partially calculated index size
1770 *
1771 * This is a helper function for 'dbg_check_idx_size()' which is called for
1772 * every indexing node and adds its size to the 'long long' variable pointed to
1773 * by @priv.
1774 */
1775 static int add_size(struct ubifs_info *c, struct ubifs_znode *znode, void *priv)
1776 {
1777 long long *idx_size = priv;
1778 int add;
1779
1780 add = ubifs_idx_node_sz(c, znode->child_cnt);
1781 add = ALIGN(add, 8);
1782 *idx_size += add;
1783 return 0;
1784 }
1785
1786 /**
1787 * dbg_check_idx_size - check index size.
1788 * @c: UBIFS file-system description object
1789 * @idx_size: size to check
1790 *
1791 * This function walks the UBIFS index, calculates its size and checks that the
1792 * size is equivalent to @idx_size. Returns zero in case of success and a
1793 * negative error code in case of failure.
1794 */
1795 int dbg_check_idx_size(struct ubifs_info *c, long long idx_size)
1796 {
1797 int err;
1798 long long calc = 0;
1799
1800 if (!dbg_is_chk_index(c))
1801 return 0;
1802
1803 err = dbg_walk_index(c, NULL, add_size, &calc);
1804 if (err) {
1805 ubifs_err("error %d while walking the index", err);
1806 return err;
1807 }
1808
1809 if (calc != idx_size) {
1810 ubifs_err("index size check failed: calculated size is %lld, "
1811 "should be %lld", calc, idx_size);
1812 dump_stack();
1813 return -EINVAL;
1814 }
1815
1816 return 0;
1817 }
1818
1819 /**
1820 * struct fsck_inode - information about an inode used when checking the file-system.
1821 * @rb: link in the RB-tree of inodes
1822 * @inum: inode number
1823 * @mode: inode type, permissions, etc
1824 * @nlink: inode link count
1825 * @xattr_cnt: count of extended attributes
1826 * @references: how many directory/xattr entries refer this inode (calculated
1827 * while walking the index)
1828 * @calc_cnt: for directory inode count of child directories
1829 * @size: inode size (read from on-flash inode)
1830 * @xattr_sz: summary size of all extended attributes (read from on-flash
1831 * inode)
1832 * @calc_sz: for directories calculated directory size
1833 * @calc_xcnt: count of extended attributes
1834 * @calc_xsz: calculated summary size of all extended attributes
1835 * @xattr_nms: sum of lengths of all extended attribute names belonging to this
1836 * inode (read from on-flash inode)
1837 * @calc_xnms: calculated sum of lengths of all extended attribute names
1838 */
1839 struct fsck_inode {
1840 struct rb_node rb;
1841 ino_t inum;
1842 umode_t mode;
1843 unsigned int nlink;
1844 unsigned int xattr_cnt;
1845 int references;
1846 int calc_cnt;
1847 long long size;
1848 unsigned int xattr_sz;
1849 long long calc_sz;
1850 long long calc_xcnt;
1851 long long calc_xsz;
1852 unsigned int xattr_nms;
1853 long long calc_xnms;
1854 };
1855
1856 /**
1857 * struct fsck_data - private FS checking information.
1858 * @inodes: RB-tree of all inodes (contains @struct fsck_inode objects)
1859 */
1860 struct fsck_data {
1861 struct rb_root inodes;
1862 };
1863
1864 /**
1865 * add_inode - add inode information to RB-tree of inodes.
1866 * @c: UBIFS file-system description object
1867 * @fsckd: FS checking information
1868 * @ino: raw UBIFS inode to add
1869 *
1870 * This is a helper function for 'check_leaf()' which adds information about
1871 * inode @ino to the RB-tree of inodes. Returns inode information pointer in
1872 * case of success and a negative error code in case of failure.
1873 */
1874 static struct fsck_inode *add_inode(struct ubifs_info *c,
1875 struct fsck_data *fsckd,
1876 struct ubifs_ino_node *ino)
1877 {
1878 struct rb_node **p, *parent = NULL;
1879 struct fsck_inode *fscki;
1880 ino_t inum = key_inum_flash(c, &ino->key);
1881 struct inode *inode;
1882 struct ubifs_inode *ui;
1883
1884 p = &fsckd->inodes.rb_node;
1885 while (*p) {
1886 parent = *p;
1887 fscki = rb_entry(parent, struct fsck_inode, rb);
1888 if (inum < fscki->inum)
1889 p = &(*p)->rb_left;
1890 else if (inum > fscki->inum)
1891 p = &(*p)->rb_right;
1892 else
1893 return fscki;
1894 }
1895
1896 if (inum > c->highest_inum) {
1897 ubifs_err("too high inode number, max. is %lu",
1898 (unsigned long)c->highest_inum);
1899 return ERR_PTR(-EINVAL);
1900 }
1901
1902 fscki = kzalloc(sizeof(struct fsck_inode), GFP_NOFS);
1903 if (!fscki)
1904 return ERR_PTR(-ENOMEM);
1905
1906 inode = ilookup(c->vfs_sb, inum);
1907
1908 fscki->inum = inum;
1909 /*
1910 * If the inode is present in the VFS inode cache, use it instead of
1911 * the on-flash inode which might be out-of-date. E.g., the size might
1912 * be out-of-date. If we do not do this, the following may happen, for
1913 * example:
1914 * 1. A power cut happens
1915 * 2. We mount the file-system R/O, the replay process fixes up the
1916 * inode size in the VFS cache, but on on-flash.
1917 * 3. 'check_leaf()' fails because it hits a data node beyond inode
1918 * size.
1919 */
1920 if (!inode) {
1921 fscki->nlink = le32_to_cpu(ino->nlink);
1922 fscki->size = le64_to_cpu(ino->size);
1923 fscki->xattr_cnt = le32_to_cpu(ino->xattr_cnt);
1924 fscki->xattr_sz = le32_to_cpu(ino->xattr_size);
1925 fscki->xattr_nms = le32_to_cpu(ino->xattr_names);
1926 fscki->mode = le32_to_cpu(ino->mode);
1927 } else {
1928 ui = ubifs_inode(inode);
1929 fscki->nlink = inode->i_nlink;
1930 fscki->size = inode->i_size;
1931 fscki->xattr_cnt = ui->xattr_cnt;
1932 fscki->xattr_sz = ui->xattr_size;
1933 fscki->xattr_nms = ui->xattr_names;
1934 fscki->mode = inode->i_mode;
1935 iput(inode);
1936 }
1937
1938 if (S_ISDIR(fscki->mode)) {
1939 fscki->calc_sz = UBIFS_INO_NODE_SZ;
1940 fscki->calc_cnt = 2;
1941 }
1942
1943 rb_link_node(&fscki->rb, parent, p);
1944 rb_insert_color(&fscki->rb, &fsckd->inodes);
1945
1946 return fscki;
1947 }
1948
1949 /**
1950 * search_inode - search inode in the RB-tree of inodes.
1951 * @fsckd: FS checking information
1952 * @inum: inode number to search
1953 *
1954 * This is a helper function for 'check_leaf()' which searches inode @inum in
1955 * the RB-tree of inodes and returns an inode information pointer or %NULL if
1956 * the inode was not found.
1957 */
1958 static struct fsck_inode *search_inode(struct fsck_data *fsckd, ino_t inum)
1959 {
1960 struct rb_node *p;
1961 struct fsck_inode *fscki;
1962
1963 p = fsckd->inodes.rb_node;
1964 while (p) {
1965 fscki = rb_entry(p, struct fsck_inode, rb);
1966 if (inum < fscki->inum)
1967 p = p->rb_left;
1968 else if (inum > fscki->inum)
1969 p = p->rb_right;
1970 else
1971 return fscki;
1972 }
1973 return NULL;
1974 }
1975
1976 /**
1977 * read_add_inode - read inode node and add it to RB-tree of inodes.
1978 * @c: UBIFS file-system description object
1979 * @fsckd: FS checking information
1980 * @inum: inode number to read
1981 *
1982 * This is a helper function for 'check_leaf()' which finds inode node @inum in
1983 * the index, reads it, and adds it to the RB-tree of inodes. Returns inode
1984 * information pointer in case of success and a negative error code in case of
1985 * failure.
1986 */
1987 static struct fsck_inode *read_add_inode(struct ubifs_info *c,
1988 struct fsck_data *fsckd, ino_t inum)
1989 {
1990 int n, err;
1991 union ubifs_key key;
1992 struct ubifs_znode *znode;
1993 struct ubifs_zbranch *zbr;
1994 struct ubifs_ino_node *ino;
1995 struct fsck_inode *fscki;
1996
1997 fscki = search_inode(fsckd, inum);
1998 if (fscki)
1999 return fscki;
2000
2001 ino_key_init(c, &key, inum);
2002 err = ubifs_lookup_level0(c, &key, &znode, &n);
2003 if (!err) {
2004 ubifs_err("inode %lu not found in index", (unsigned long)inum);
2005 return ERR_PTR(-ENOENT);
2006 } else if (err < 0) {
2007 ubifs_err("error %d while looking up inode %lu",
2008 err, (unsigned long)inum);
2009 return ERR_PTR(err);
2010 }
2011
2012 zbr = &znode->zbranch[n];
2013 if (zbr->len < UBIFS_INO_NODE_SZ) {
2014 ubifs_err("bad node %lu node length %d",
2015 (unsigned long)inum, zbr->len);
2016 return ERR_PTR(-EINVAL);
2017 }
2018
2019 ino = kmalloc(zbr->len, GFP_NOFS);
2020 if (!ino)
2021 return ERR_PTR(-ENOMEM);
2022
2023 err = ubifs_tnc_read_node(c, zbr, ino);
2024 if (err) {
2025 ubifs_err("cannot read inode node at LEB %d:%d, error %d",
2026 zbr->lnum, zbr->offs, err);
2027 kfree(ino);
2028 return ERR_PTR(err);
2029 }
2030
2031 fscki = add_inode(c, fsckd, ino);
2032 kfree(ino);
2033 if (IS_ERR(fscki)) {
2034 ubifs_err("error %ld while adding inode %lu node",
2035 PTR_ERR(fscki), (unsigned long)inum);
2036 return fscki;
2037 }
2038
2039 return fscki;
2040 }
2041
2042 /**
2043 * check_leaf - check leaf node.
2044 * @c: UBIFS file-system description object
2045 * @zbr: zbranch of the leaf node to check
2046 * @priv: FS checking information
2047 *
2048 * This is a helper function for 'dbg_check_filesystem()' which is called for
2049 * every single leaf node while walking the indexing tree. It checks that the
2050 * leaf node referred from the indexing tree exists, has correct CRC, and does
2051 * some other basic validation. This function is also responsible for building
2052 * an RB-tree of inodes - it adds all inodes into the RB-tree. It also
2053 * calculates reference count, size, etc for each inode in order to later
2054 * compare them to the information stored inside the inodes and detect possible
2055 * inconsistencies. Returns zero in case of success and a negative error code
2056 * in case of failure.
2057 */
2058 static int check_leaf(struct ubifs_info *c, struct ubifs_zbranch *zbr,
2059 void *priv)
2060 {
2061 ino_t inum;
2062 void *node;
2063 struct ubifs_ch *ch;
2064 int err, type = key_type(c, &zbr->key);
2065 struct fsck_inode *fscki;
2066
2067 if (zbr->len < UBIFS_CH_SZ) {
2068 ubifs_err("bad leaf length %d (LEB %d:%d)",
2069 zbr->len, zbr->lnum, zbr->offs);
2070 return -EINVAL;
2071 }
2072
2073 node = kmalloc(zbr->len, GFP_NOFS);
2074 if (!node)
2075 return -ENOMEM;
2076
2077 err = ubifs_tnc_read_node(c, zbr, node);
2078 if (err) {
2079 ubifs_err("cannot read leaf node at LEB %d:%d, error %d",
2080 zbr->lnum, zbr->offs, err);
2081 goto out_free;
2082 }
2083
2084 /* If this is an inode node, add it to RB-tree of inodes */
2085 if (type == UBIFS_INO_KEY) {
2086 fscki = add_inode(c, priv, node);
2087 if (IS_ERR(fscki)) {
2088 err = PTR_ERR(fscki);
2089 ubifs_err("error %d while adding inode node", err);
2090 goto out_dump;
2091 }
2092 goto out;
2093 }
2094
2095 if (type != UBIFS_DENT_KEY && type != UBIFS_XENT_KEY &&
2096 type != UBIFS_DATA_KEY) {
2097 ubifs_err("unexpected node type %d at LEB %d:%d",
2098 type, zbr->lnum, zbr->offs);
2099 err = -EINVAL;
2100 goto out_free;
2101 }
2102
2103 ch = node;
2104 if (le64_to_cpu(ch->sqnum) > c->max_sqnum) {
2105 ubifs_err("too high sequence number, max. is %llu",
2106 c->max_sqnum);
2107 err = -EINVAL;
2108 goto out_dump;
2109 }
2110
2111 if (type == UBIFS_DATA_KEY) {
2112 long long blk_offs;
2113 struct ubifs_data_node *dn = node;
2114
2115 /*
2116 * Search the inode node this data node belongs to and insert
2117 * it to the RB-tree of inodes.
2118 */
2119 inum = key_inum_flash(c, &dn->key);
2120 fscki = read_add_inode(c, priv, inum);
2121 if (IS_ERR(fscki)) {
2122 err = PTR_ERR(fscki);
2123 ubifs_err("error %d while processing data node and "
2124 "trying to find inode node %lu",
2125 err, (unsigned long)inum);
2126 goto out_dump;
2127 }
2128
2129 /* Make sure the data node is within inode size */
2130 blk_offs = key_block_flash(c, &dn->key);
2131 blk_offs <<= UBIFS_BLOCK_SHIFT;
2132 blk_offs += le32_to_cpu(dn->size);
2133 if (blk_offs > fscki->size) {
2134 ubifs_err("data node at LEB %d:%d is not within inode "
2135 "size %lld", zbr->lnum, zbr->offs,
2136 fscki->size);
2137 err = -EINVAL;
2138 goto out_dump;
2139 }
2140 } else {
2141 int nlen;
2142 struct ubifs_dent_node *dent = node;
2143 struct fsck_inode *fscki1;
2144
2145 err = ubifs_validate_entry(c, dent);
2146 if (err)
2147 goto out_dump;
2148
2149 /*
2150 * Search the inode node this entry refers to and the parent
2151 * inode node and insert them to the RB-tree of inodes.
2152 */
2153 inum = le64_to_cpu(dent->inum);
2154 fscki = read_add_inode(c, priv, inum);
2155 if (IS_ERR(fscki)) {
2156 err = PTR_ERR(fscki);
2157 ubifs_err("error %d while processing entry node and "
2158 "trying to find inode node %lu",
2159 err, (unsigned long)inum);
2160 goto out_dump;
2161 }
2162
2163 /* Count how many direntries or xentries refers this inode */
2164 fscki->references += 1;
2165
2166 inum = key_inum_flash(c, &dent->key);
2167 fscki1 = read_add_inode(c, priv, inum);
2168 if (IS_ERR(fscki1)) {
2169 err = PTR_ERR(fscki1);
2170 ubifs_err("error %d while processing entry node and "
2171 "trying to find parent inode node %lu",
2172 err, (unsigned long)inum);
2173 goto out_dump;
2174 }
2175
2176 nlen = le16_to_cpu(dent->nlen);
2177 if (type == UBIFS_XENT_KEY) {
2178 fscki1->calc_xcnt += 1;
2179 fscki1->calc_xsz += CALC_DENT_SIZE(nlen);
2180 fscki1->calc_xsz += CALC_XATTR_BYTES(fscki->size);
2181 fscki1->calc_xnms += nlen;
2182 } else {
2183 fscki1->calc_sz += CALC_DENT_SIZE(nlen);
2184 if (dent->type == UBIFS_ITYPE_DIR)
2185 fscki1->calc_cnt += 1;
2186 }
2187 }
2188
2189 out:
2190 kfree(node);
2191 return 0;
2192
2193 out_dump:
2194 ubifs_msg("dump of node at LEB %d:%d", zbr->lnum, zbr->offs);
2195 dbg_dump_node(c, node);
2196 out_free:
2197 kfree(node);
2198 return err;
2199 }
2200
2201 /**
2202 * free_inodes - free RB-tree of inodes.
2203 * @fsckd: FS checking information
2204 */
2205 static void free_inodes(struct fsck_data *fsckd)
2206 {
2207 struct rb_node *this = fsckd->inodes.rb_node;
2208 struct fsck_inode *fscki;
2209
2210 while (this) {
2211 if (this->rb_left)
2212 this = this->rb_left;
2213 else if (this->rb_right)
2214 this = this->rb_right;
2215 else {
2216 fscki = rb_entry(this, struct fsck_inode, rb);
2217 this = rb_parent(this);
2218 if (this) {
2219 if (this->rb_left == &fscki->rb)
2220 this->rb_left = NULL;
2221 else
2222 this->rb_right = NULL;
2223 }
2224 kfree(fscki);
2225 }
2226 }
2227 }
2228
2229 /**
2230 * check_inodes - checks all inodes.
2231 * @c: UBIFS file-system description object
2232 * @fsckd: FS checking information
2233 *
2234 * This is a helper function for 'dbg_check_filesystem()' which walks the
2235 * RB-tree of inodes after the index scan has been finished, and checks that
2236 * inode nlink, size, etc are correct. Returns zero if inodes are fine,
2237 * %-EINVAL if not, and a negative error code in case of failure.
2238 */
2239 static int check_inodes(struct ubifs_info *c, struct fsck_data *fsckd)
2240 {
2241 int n, err;
2242 union ubifs_key key;
2243 struct ubifs_znode *znode;
2244 struct ubifs_zbranch *zbr;
2245 struct ubifs_ino_node *ino;
2246 struct fsck_inode *fscki;
2247 struct rb_node *this = rb_first(&fsckd->inodes);
2248
2249 while (this) {
2250 fscki = rb_entry(this, struct fsck_inode, rb);
2251 this = rb_next(this);
2252
2253 if (S_ISDIR(fscki->mode)) {
2254 /*
2255 * Directories have to have exactly one reference (they
2256 * cannot have hardlinks), although root inode is an
2257 * exception.
2258 */
2259 if (fscki->inum != UBIFS_ROOT_INO &&
2260 fscki->references != 1) {
2261 ubifs_err("directory inode %lu has %d "
2262 "direntries which refer it, but "
2263 "should be 1",
2264 (unsigned long)fscki->inum,
2265 fscki->references);
2266 goto out_dump;
2267 }
2268 if (fscki->inum == UBIFS_ROOT_INO &&
2269 fscki->references != 0) {
2270 ubifs_err("root inode %lu has non-zero (%d) "
2271 "direntries which refer it",
2272 (unsigned long)fscki->inum,
2273 fscki->references);
2274 goto out_dump;
2275 }
2276 if (fscki->calc_sz != fscki->size) {
2277 ubifs_err("directory inode %lu size is %lld, "
2278 "but calculated size is %lld",
2279 (unsigned long)fscki->inum,
2280 fscki->size, fscki->calc_sz);
2281 goto out_dump;
2282 }
2283 if (fscki->calc_cnt != fscki->nlink) {
2284 ubifs_err("directory inode %lu nlink is %d, "
2285 "but calculated nlink is %d",
2286 (unsigned long)fscki->inum,
2287 fscki->nlink, fscki->calc_cnt);
2288 goto out_dump;
2289 }
2290 } else {
2291 if (fscki->references != fscki->nlink) {
2292 ubifs_err("inode %lu nlink is %d, but "
2293 "calculated nlink is %d",
2294 (unsigned long)fscki->inum,
2295 fscki->nlink, fscki->references);
2296 goto out_dump;
2297 }
2298 }
2299 if (fscki->xattr_sz != fscki->calc_xsz) {
2300 ubifs_err("inode %lu has xattr size %u, but "
2301 "calculated size is %lld",
2302 (unsigned long)fscki->inum, fscki->xattr_sz,
2303 fscki->calc_xsz);
2304 goto out_dump;
2305 }
2306 if (fscki->xattr_cnt != fscki->calc_xcnt) {
2307 ubifs_err("inode %lu has %u xattrs, but "
2308 "calculated count is %lld",
2309 (unsigned long)fscki->inum,
2310 fscki->xattr_cnt, fscki->calc_xcnt);
2311 goto out_dump;
2312 }
2313 if (fscki->xattr_nms != fscki->calc_xnms) {
2314 ubifs_err("inode %lu has xattr names' size %u, but "
2315 "calculated names' size is %lld",
2316 (unsigned long)fscki->inum, fscki->xattr_nms,
2317 fscki->calc_xnms);
2318 goto out_dump;
2319 }
2320 }
2321
2322 return 0;
2323
2324 out_dump:
2325 /* Read the bad inode and dump it */
2326 ino_key_init(c, &key, fscki->inum);
2327 err = ubifs_lookup_level0(c, &key, &znode, &n);
2328 if (!err) {
2329 ubifs_err("inode %lu not found in index",
2330 (unsigned long)fscki->inum);
2331 return -ENOENT;
2332 } else if (err < 0) {
2333 ubifs_err("error %d while looking up inode %lu",
2334 err, (unsigned long)fscki->inum);
2335 return err;
2336 }
2337
2338 zbr = &znode->zbranch[n];
2339 ino = kmalloc(zbr->len, GFP_NOFS);
2340 if (!ino)
2341 return -ENOMEM;
2342
2343 err = ubifs_tnc_read_node(c, zbr, ino);
2344 if (err) {
2345 ubifs_err("cannot read inode node at LEB %d:%d, error %d",
2346 zbr->lnum, zbr->offs, err);
2347 kfree(ino);
2348 return err;
2349 }
2350
2351 ubifs_msg("dump of the inode %lu sitting in LEB %d:%d",
2352 (unsigned long)fscki->inum, zbr->lnum, zbr->offs);
2353 dbg_dump_node(c, ino);
2354 kfree(ino);
2355 return -EINVAL;
2356 }
2357
2358 /**
2359 * dbg_check_filesystem - check the file-system.
2360 * @c: UBIFS file-system description object
2361 *
2362 * This function checks the file system, namely:
2363 * o makes sure that all leaf nodes exist and their CRCs are correct;
2364 * o makes sure inode nlink, size, xattr size/count are correct (for all
2365 * inodes).
2366 *
2367 * The function reads whole indexing tree and all nodes, so it is pretty
2368 * heavy-weight. Returns zero if the file-system is consistent, %-EINVAL if
2369 * not, and a negative error code in case of failure.
2370 */
2371 int dbg_check_filesystem(struct ubifs_info *c)
2372 {
2373 int err;
2374 struct fsck_data fsckd;
2375
2376 if (!dbg_is_chk_fs(c))
2377 return 0;
2378
2379 fsckd.inodes = RB_ROOT;
2380 err = dbg_walk_index(c, check_leaf, NULL, &fsckd);
2381 if (err)
2382 goto out_free;
2383
2384 err = check_inodes(c, &fsckd);
2385 if (err)
2386 goto out_free;
2387
2388 free_inodes(&fsckd);
2389 return 0;
2390
2391 out_free:
2392 ubifs_err("file-system check failed with error %d", err);
2393 dump_stack();
2394 free_inodes(&fsckd);
2395 return err;
2396 }
2397
2398 /**
2399 * dbg_check_data_nodes_order - check that list of data nodes is sorted.
2400 * @c: UBIFS file-system description object
2401 * @head: the list of nodes ('struct ubifs_scan_node' objects)
2402 *
2403 * This function returns zero if the list of data nodes is sorted correctly,
2404 * and %-EINVAL if not.
2405 */
2406 int dbg_check_data_nodes_order(struct ubifs_info *c, struct list_head *head)
2407 {
2408 struct list_head *cur;
2409 struct ubifs_scan_node *sa, *sb;
2410
2411 if (!dbg_is_chk_gen(c))
2412 return 0;
2413
2414 for (cur = head->next; cur->next != head; cur = cur->next) {
2415 ino_t inuma, inumb;
2416 uint32_t blka, blkb;
2417
2418 cond_resched();
2419 sa = container_of(cur, struct ubifs_scan_node, list);
2420 sb = container_of(cur->next, struct ubifs_scan_node, list);
2421
2422 if (sa->type != UBIFS_DATA_NODE) {
2423 ubifs_err("bad node type %d", sa->type);
2424 dbg_dump_node(c, sa->node);
2425 return -EINVAL;
2426 }
2427 if (sb->type != UBIFS_DATA_NODE) {
2428 ubifs_err("bad node type %d", sb->type);
2429 dbg_dump_node(c, sb->node);
2430 return -EINVAL;
2431 }
2432
2433 inuma = key_inum(c, &sa->key);
2434 inumb = key_inum(c, &sb->key);
2435
2436 if (inuma < inumb)
2437 continue;
2438 if (inuma > inumb) {
2439 ubifs_err("larger inum %lu goes before inum %lu",
2440 (unsigned long)inuma, (unsigned long)inumb);
2441 goto error_dump;
2442 }
2443
2444 blka = key_block(c, &sa->key);
2445 blkb = key_block(c, &sb->key);
2446
2447 if (blka > blkb) {
2448 ubifs_err("larger block %u goes before %u", blka, blkb);
2449 goto error_dump;
2450 }
2451 if (blka == blkb) {
2452 ubifs_err("two data nodes for the same block");
2453 goto error_dump;
2454 }
2455 }
2456
2457 return 0;
2458
2459 error_dump:
2460 dbg_dump_node(c, sa->node);
2461 dbg_dump_node(c, sb->node);
2462 return -EINVAL;
2463 }
2464
2465 /**
2466 * dbg_check_nondata_nodes_order - check that list of data nodes is sorted.
2467 * @c: UBIFS file-system description object
2468 * @head: the list of nodes ('struct ubifs_scan_node' objects)
2469 *
2470 * This function returns zero if the list of non-data nodes is sorted correctly,
2471 * and %-EINVAL if not.
2472 */
2473 int dbg_check_nondata_nodes_order(struct ubifs_info *c, struct list_head *head)
2474 {
2475 struct list_head *cur;
2476 struct ubifs_scan_node *sa, *sb;
2477
2478 if (!dbg_is_chk_gen(c))
2479 return 0;
2480
2481 for (cur = head->next; cur->next != head; cur = cur->next) {
2482 ino_t inuma, inumb;
2483 uint32_t hasha, hashb;
2484
2485 cond_resched();
2486 sa = container_of(cur, struct ubifs_scan_node, list);
2487 sb = container_of(cur->next, struct ubifs_scan_node, list);
2488
2489 if (sa->type != UBIFS_INO_NODE && sa->type != UBIFS_DENT_NODE &&
2490 sa->type != UBIFS_XENT_NODE) {
2491 ubifs_err("bad node type %d", sa->type);
2492 dbg_dump_node(c, sa->node);
2493 return -EINVAL;
2494 }
2495 if (sa->type != UBIFS_INO_NODE && sa->type != UBIFS_DENT_NODE &&
2496 sa->type != UBIFS_XENT_NODE) {
2497 ubifs_err("bad node type %d", sb->type);
2498 dbg_dump_node(c, sb->node);
2499 return -EINVAL;
2500 }
2501
2502 if (sa->type != UBIFS_INO_NODE && sb->type == UBIFS_INO_NODE) {
2503 ubifs_err("non-inode node goes before inode node");
2504 goto error_dump;
2505 }
2506
2507 if (sa->type == UBIFS_INO_NODE && sb->type != UBIFS_INO_NODE)
2508 continue;
2509
2510 if (sa->type == UBIFS_INO_NODE && sb->type == UBIFS_INO_NODE) {
2511 /* Inode nodes are sorted in descending size order */
2512 if (sa->len < sb->len) {
2513 ubifs_err("smaller inode node goes first");
2514 goto error_dump;
2515 }
2516 continue;
2517 }
2518
2519 /*
2520 * This is either a dentry or xentry, which should be sorted in
2521 * ascending (parent ino, hash) order.
2522 */
2523 inuma = key_inum(c, &sa->key);
2524 inumb = key_inum(c, &sb->key);
2525
2526 if (inuma < inumb)
2527 continue;
2528 if (inuma > inumb) {
2529 ubifs_err("larger inum %lu goes before inum %lu",
2530 (unsigned long)inuma, (unsigned long)inumb);
2531 goto error_dump;
2532 }
2533
2534 hasha = key_block(c, &sa->key);
2535 hashb = key_block(c, &sb->key);
2536
2537 if (hasha > hashb) {
2538 ubifs_err("larger hash %u goes before %u",
2539 hasha, hashb);
2540 goto error_dump;
2541 }
2542 }
2543
2544 return 0;
2545
2546 error_dump:
2547 ubifs_msg("dumping first node");
2548 dbg_dump_node(c, sa->node);
2549 ubifs_msg("dumping second node");
2550 dbg_dump_node(c, sb->node);
2551 return -EINVAL;
2552 return 0;
2553 }
2554
2555 static inline int chance(unsigned int n, unsigned int out_of)
2556 {
2557 return !!((random32() % out_of) + 1 <= n);
2558
2559 }
2560
2561 static int power_cut_emulated(struct ubifs_info *c, int lnum, int write)
2562 {
2563 struct ubifs_debug_info *d = c->dbg;
2564
2565 ubifs_assert(dbg_is_tst_rcvry(c));
2566
2567 if (!d->pc_cnt) {
2568 /* First call - decide delay to the power cut */
2569 if (chance(1, 2)) {
2570 unsigned long delay;
2571
2572 if (chance(1, 2)) {
2573 d->pc_delay = 1;
2574 /* Fail withing 1 minute */
2575 delay = random32() % 60000;
2576 d->pc_timeout = jiffies;
2577 d->pc_timeout += msecs_to_jiffies(delay);
2578 ubifs_warn("failing after %lums", delay);
2579 } else {
2580 d->pc_delay = 2;
2581 delay = random32() % 10000;
2582 /* Fail within 10000 operations */
2583 d->pc_cnt_max = delay;
2584 ubifs_warn("failing after %lu calls", delay);
2585 }
2586 }
2587
2588 d->pc_cnt += 1;
2589 }
2590
2591 /* Determine if failure delay has expired */
2592 if (d->pc_delay == 1 && time_before(jiffies, d->pc_timeout))
2593 return 0;
2594 if (d->pc_delay == 2 && d->pc_cnt++ < d->pc_cnt_max)
2595 return 0;
2596
2597 if (lnum == UBIFS_SB_LNUM) {
2598 if (write && chance(1, 2))
2599 return 0;
2600 if (chance(19, 20))
2601 return 0;
2602 ubifs_warn("failing in super block LEB %d", lnum);
2603 } else if (lnum == UBIFS_MST_LNUM || lnum == UBIFS_MST_LNUM + 1) {
2604 if (chance(19, 20))
2605 return 0;
2606 ubifs_warn("failing in master LEB %d", lnum);
2607 } else if (lnum >= UBIFS_LOG_LNUM && lnum <= c->log_last) {
2608 if (write && chance(99, 100))
2609 return 0;
2610 if (chance(399, 400))
2611 return 0;
2612 ubifs_warn("failing in log LEB %d", lnum);
2613 } else if (lnum >= c->lpt_first && lnum <= c->lpt_last) {
2614 if (write && chance(7, 8))
2615 return 0;
2616 if (chance(19, 20))
2617 return 0;
2618 ubifs_warn("failing in LPT LEB %d", lnum);
2619 } else if (lnum >= c->orph_first && lnum <= c->orph_last) {
2620 if (write && chance(1, 2))
2621 return 0;
2622 if (chance(9, 10))
2623 return 0;
2624 ubifs_warn("failing in orphan LEB %d", lnum);
2625 } else if (lnum == c->ihead_lnum) {
2626 if (chance(99, 100))
2627 return 0;
2628 ubifs_warn("failing in index head LEB %d", lnum);
2629 } else if (c->jheads && lnum == c->jheads[GCHD].wbuf.lnum) {
2630 if (chance(9, 10))
2631 return 0;
2632 ubifs_warn("failing in GC head LEB %d", lnum);
2633 } else if (write && !RB_EMPTY_ROOT(&c->buds) &&
2634 !ubifs_search_bud(c, lnum)) {
2635 if (chance(19, 20))
2636 return 0;
2637 ubifs_warn("failing in non-bud LEB %d", lnum);
2638 } else if (c->cmt_state == COMMIT_RUNNING_BACKGROUND ||
2639 c->cmt_state == COMMIT_RUNNING_REQUIRED) {
2640 if (chance(999, 1000))
2641 return 0;
2642 ubifs_warn("failing in bud LEB %d commit running", lnum);
2643 } else {
2644 if (chance(9999, 10000))
2645 return 0;
2646 ubifs_warn("failing in bud LEB %d commit not running", lnum);
2647 }
2648
2649 d->pc_happened = 1;
2650 ubifs_warn("========== Power cut emulated ==========");
2651 dump_stack();
2652 return 1;
2653 }
2654
2655 static void cut_data(const void *buf, unsigned int len)
2656 {
2657 unsigned int from, to, i, ffs = chance(1, 2);
2658 unsigned char *p = (void *)buf;
2659
2660 from = random32() % (len + 1);
2661 if (chance(1, 2))
2662 to = random32() % (len - from + 1);
2663 else
2664 to = len;
2665
2666 if (from < to)
2667 ubifs_warn("filled bytes %u-%u with %s", from, to - 1,
2668 ffs ? "0xFFs" : "random data");
2669
2670 if (ffs)
2671 for (i = from; i < to; i++)
2672 p[i] = 0xFF;
2673 else
2674 for (i = from; i < to; i++)
2675 p[i] = random32() % 0x100;
2676 }
2677
2678 int dbg_leb_write(struct ubifs_info *c, int lnum, const void *buf,
2679 int offs, int len, int dtype)
2680 {
2681 int err, failing;
2682
2683 if (c->dbg->pc_happened)
2684 return -EROFS;
2685
2686 failing = power_cut_emulated(c, lnum, 1);
2687 if (failing)
2688 cut_data(buf, len);
2689 err = ubi_leb_write(c->ubi, lnum, buf, offs, len, dtype);
2690 if (err)
2691 return err;
2692 if (failing)
2693 return -EROFS;
2694 return 0;
2695 }
2696
2697 int dbg_leb_change(struct ubifs_info *c, int lnum, const void *buf,
2698 int len, int dtype)
2699 {
2700 int err;
2701
2702 if (c->dbg->pc_happened)
2703 return -EROFS;
2704 if (power_cut_emulated(c, lnum, 1))
2705 return -EROFS;
2706 err = ubi_leb_change(c->ubi, lnum, buf, len, dtype);
2707 if (err)
2708 return err;
2709 if (power_cut_emulated(c, lnum, 1))
2710 return -EROFS;
2711 return 0;
2712 }
2713
2714 int dbg_leb_unmap(struct ubifs_info *c, int lnum)
2715 {
2716 int err;
2717
2718 if (c->dbg->pc_happened)
2719 return -EROFS;
2720 if (power_cut_emulated(c, lnum, 0))
2721 return -EROFS;
2722 err = ubi_leb_unmap(c->ubi, lnum);
2723 if (err)
2724 return err;
2725 if (power_cut_emulated(c, lnum, 0))
2726 return -EROFS;
2727 return 0;
2728 }
2729
2730 int dbg_leb_map(struct ubifs_info *c, int lnum, int dtype)
2731 {
2732 int err;
2733
2734 if (c->dbg->pc_happened)
2735 return -EROFS;
2736 if (power_cut_emulated(c, lnum, 0))
2737 return -EROFS;
2738 err = ubi_leb_map(c->ubi, lnum, dtype);
2739 if (err)
2740 return err;
2741 if (power_cut_emulated(c, lnum, 0))
2742 return -EROFS;
2743 return 0;
2744 }
2745
2746 /*
2747 * Root directory for UBIFS stuff in debugfs. Contains sub-directories which
2748 * contain the stuff specific to particular file-system mounts.
2749 */
2750 static struct dentry *dfs_rootdir;
2751
2752 static int dfs_file_open(struct inode *inode, struct file *file)
2753 {
2754 file->private_data = inode->i_private;
2755 return nonseekable_open(inode, file);
2756 }
2757
2758 /**
2759 * provide_user_output - provide output to the user reading a debugfs file.
2760 * @val: boolean value for the answer
2761 * @u: the buffer to store the answer at
2762 * @count: size of the buffer
2763 * @ppos: position in the @u output buffer
2764 *
2765 * This is a simple helper function which stores @val boolean value in the user
2766 * buffer when the user reads one of UBIFS debugfs files. Returns amount of
2767 * bytes written to @u in case of success and a negative error code in case of
2768 * failure.
2769 */
2770 static int provide_user_output(int val, char __user *u, size_t count,
2771 loff_t *ppos)
2772 {
2773 char buf[3];
2774
2775 if (val)
2776 buf[0] = '1';
2777 else
2778 buf[0] = '0';
2779 buf[1] = '\n';
2780 buf[2] = 0x00;
2781
2782 return simple_read_from_buffer(u, count, ppos, buf, 2);
2783 }
2784
2785 static ssize_t dfs_file_read(struct file *file, char __user *u, size_t count,
2786 loff_t *ppos)
2787 {
2788 struct dentry *dent = file->f_path.dentry;
2789 struct ubifs_info *c = file->private_data;
2790 struct ubifs_debug_info *d = c->dbg;
2791 int val;
2792
2793 if (dent == d->dfs_chk_gen)
2794 val = d->chk_gen;
2795 else if (dent == d->dfs_chk_index)
2796 val = d->chk_index;
2797 else if (dent == d->dfs_chk_orph)
2798 val = d->chk_orph;
2799 else if (dent == d->dfs_chk_lprops)
2800 val = d->chk_lprops;
2801 else if (dent == d->dfs_chk_fs)
2802 val = d->chk_fs;
2803 else if (dent == d->dfs_tst_rcvry)
2804 val = d->tst_rcvry;
2805 else
2806 return -EINVAL;
2807
2808 return provide_user_output(val, u, count, ppos);
2809 }
2810
2811 /**
2812 * interpret_user_input - interpret user debugfs file input.
2813 * @u: user-provided buffer with the input
2814 * @count: buffer size
2815 *
2816 * This is a helper function which interpret user input to a boolean UBIFS
2817 * debugfs file. Returns %0 or %1 in case of success and a negative error code
2818 * in case of failure.
2819 */
2820 static int interpret_user_input(const char __user *u, size_t count)
2821 {
2822 size_t buf_size;
2823 char buf[8];
2824
2825 buf_size = min_t(size_t, count, (sizeof(buf) - 1));
2826 if (copy_from_user(buf, u, buf_size))
2827 return -EFAULT;
2828
2829 if (buf[0] == '1')
2830 return 1;
2831 else if (buf[0] == '0')
2832 return 0;
2833
2834 return -EINVAL;
2835 }
2836
2837 static ssize_t dfs_file_write(struct file *file, const char __user *u,
2838 size_t count, loff_t *ppos)
2839 {
2840 struct ubifs_info *c = file->private_data;
2841 struct ubifs_debug_info *d = c->dbg;
2842 struct dentry *dent = file->f_path.dentry;
2843 int val;
2844
2845 /*
2846 * TODO: this is racy - the file-system might have already been
2847 * unmounted and we'd oops in this case. The plan is to fix it with
2848 * help of 'iterate_supers_type()' which we should have in v3.0: when
2849 * a debugfs opened, we rember FS's UUID in file->private_data. Then
2850 * whenever we access the FS via a debugfs file, we iterate all UBIFS
2851 * superblocks and fine the one with the same UUID, and take the
2852 * locking right.
2853 *
2854 * The other way to go suggested by Al Viro is to create a separate
2855 * 'ubifs-debug' file-system instead.
2856 */
2857 if (file->f_path.dentry == d->dfs_dump_lprops) {
2858 dbg_dump_lprops(c);
2859 return count;
2860 }
2861 if (file->f_path.dentry == d->dfs_dump_budg) {
2862 dbg_dump_budg(c, &c->bi);
2863 return count;
2864 }
2865 if (file->f_path.dentry == d->dfs_dump_tnc) {
2866 mutex_lock(&c->tnc_mutex);
2867 dbg_dump_tnc(c);
2868 mutex_unlock(&c->tnc_mutex);
2869 return count;
2870 }
2871
2872 val = interpret_user_input(u, count);
2873 if (val < 0)
2874 return val;
2875
2876 if (dent == d->dfs_chk_gen)
2877 d->chk_gen = val;
2878 else if (dent == d->dfs_chk_index)
2879 d->chk_index = val;
2880 else if (dent == d->dfs_chk_orph)
2881 d->chk_orph = val;
2882 else if (dent == d->dfs_chk_lprops)
2883 d->chk_lprops = val;
2884 else if (dent == d->dfs_chk_fs)
2885 d->chk_fs = val;
2886 else if (dent == d->dfs_tst_rcvry)
2887 d->tst_rcvry = val;
2888 else
2889 return -EINVAL;
2890
2891 return count;
2892 }
2893
2894 static const struct file_operations dfs_fops = {
2895 .open = dfs_file_open,
2896 .read = dfs_file_read,
2897 .write = dfs_file_write,
2898 .owner = THIS_MODULE,
2899 .llseek = no_llseek,
2900 };
2901
2902 /**
2903 * dbg_debugfs_init_fs - initialize debugfs for UBIFS instance.
2904 * @c: UBIFS file-system description object
2905 *
2906 * This function creates all debugfs files for this instance of UBIFS. Returns
2907 * zero in case of success and a negative error code in case of failure.
2908 *
2909 * Note, the only reason we have not merged this function with the
2910 * 'ubifs_debugging_init()' function is because it is better to initialize
2911 * debugfs interfaces at the very end of the mount process, and remove them at
2912 * the very beginning of the mount process.
2913 */
2914 int dbg_debugfs_init_fs(struct ubifs_info *c)
2915 {
2916 int err, n;
2917 const char *fname;
2918 struct dentry *dent;
2919 struct ubifs_debug_info *d = c->dbg;
2920
2921 n = snprintf(d->dfs_dir_name, UBIFS_DFS_DIR_LEN + 1, UBIFS_DFS_DIR_NAME,
2922 c->vi.ubi_num, c->vi.vol_id);
2923 if (n == UBIFS_DFS_DIR_LEN) {
2924 /* The array size is too small */
2925 fname = UBIFS_DFS_DIR_NAME;
2926 dent = ERR_PTR(-EINVAL);
2927 goto out;
2928 }
2929
2930 fname = d->dfs_dir_name;
2931 dent = debugfs_create_dir(fname, dfs_rootdir);
2932 if (IS_ERR_OR_NULL(dent))
2933 goto out;
2934 d->dfs_dir = dent;
2935
2936 fname = "dump_lprops";
2937 dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, c, &dfs_fops);
2938 if (IS_ERR_OR_NULL(dent))
2939 goto out_remove;
2940 d->dfs_dump_lprops = dent;
2941
2942 fname = "dump_budg";
2943 dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, c, &dfs_fops);
2944 if (IS_ERR_OR_NULL(dent))
2945 goto out_remove;
2946 d->dfs_dump_budg = dent;
2947
2948 fname = "dump_tnc";
2949 dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, c, &dfs_fops);
2950 if (IS_ERR_OR_NULL(dent))
2951 goto out_remove;
2952 d->dfs_dump_tnc = dent;
2953
2954 fname = "chk_general";
2955 dent = debugfs_create_file(fname, S_IRUSR | S_IWUSR, d->dfs_dir, c,
2956 &dfs_fops);
2957 if (IS_ERR_OR_NULL(dent))
2958 goto out_remove;
2959 d->dfs_chk_gen = dent;
2960
2961 fname = "chk_index";
2962 dent = debugfs_create_file(fname, S_IRUSR | S_IWUSR, d->dfs_dir, c,
2963 &dfs_fops);
2964 if (IS_ERR_OR_NULL(dent))
2965 goto out_remove;
2966 d->dfs_chk_index = dent;
2967
2968 fname = "chk_orphans";
2969 dent = debugfs_create_file(fname, S_IRUSR | S_IWUSR, d->dfs_dir, c,
2970 &dfs_fops);
2971 if (IS_ERR_OR_NULL(dent))
2972 goto out_remove;
2973 d->dfs_chk_orph = dent;
2974
2975 fname = "chk_lprops";
2976 dent = debugfs_create_file(fname, S_IRUSR | S_IWUSR, d->dfs_dir, c,
2977 &dfs_fops);
2978 if (IS_ERR_OR_NULL(dent))
2979 goto out_remove;
2980 d->dfs_chk_lprops = dent;
2981
2982 fname = "chk_fs";
2983 dent = debugfs_create_file(fname, S_IRUSR | S_IWUSR, d->dfs_dir, c,
2984 &dfs_fops);
2985 if (IS_ERR_OR_NULL(dent))
2986 goto out_remove;
2987 d->dfs_chk_fs = dent;
2988
2989 fname = "tst_recovery";
2990 dent = debugfs_create_file(fname, S_IRUSR | S_IWUSR, d->dfs_dir, c,
2991 &dfs_fops);
2992 if (IS_ERR_OR_NULL(dent))
2993 goto out_remove;
2994 d->dfs_tst_rcvry = dent;
2995
2996 return 0;
2997
2998 out_remove:
2999 debugfs_remove_recursive(d->dfs_dir);
3000 out:
3001 err = dent ? PTR_ERR(dent) : -ENODEV;
3002 ubifs_err("cannot create \"%s\" debugfs file or directory, error %d\n",
3003 fname, err);
3004 return err;
3005 }
3006
3007 /**
3008 * dbg_debugfs_exit_fs - remove all debugfs files.
3009 * @c: UBIFS file-system description object
3010 */
3011 void dbg_debugfs_exit_fs(struct ubifs_info *c)
3012 {
3013 debugfs_remove_recursive(c->dbg->dfs_dir);
3014 }
3015
3016 struct ubifs_global_debug_info ubifs_dbg;
3017
3018 static struct dentry *dfs_chk_gen;
3019 static struct dentry *dfs_chk_index;
3020 static struct dentry *dfs_chk_orph;
3021 static struct dentry *dfs_chk_lprops;
3022 static struct dentry *dfs_chk_fs;
3023 static struct dentry *dfs_tst_rcvry;
3024
3025 static ssize_t dfs_global_file_read(struct file *file, char __user *u,
3026 size_t count, loff_t *ppos)
3027 {
3028 struct dentry *dent = file->f_path.dentry;
3029 int val;
3030
3031 if (dent == dfs_chk_gen)
3032 val = ubifs_dbg.chk_gen;
3033 else if (dent == dfs_chk_index)
3034 val = ubifs_dbg.chk_index;
3035 else if (dent == dfs_chk_orph)
3036 val = ubifs_dbg.chk_orph;
3037 else if (dent == dfs_chk_lprops)
3038 val = ubifs_dbg.chk_lprops;
3039 else if (dent == dfs_chk_fs)
3040 val = ubifs_dbg.chk_fs;
3041 else if (dent == dfs_tst_rcvry)
3042 val = ubifs_dbg.tst_rcvry;
3043 else
3044 return -EINVAL;
3045
3046 return provide_user_output(val, u, count, ppos);
3047 }
3048
3049 static ssize_t dfs_global_file_write(struct file *file, const char __user *u,
3050 size_t count, loff_t *ppos)
3051 {
3052 struct dentry *dent = file->f_path.dentry;
3053 int val;
3054
3055 val = interpret_user_input(u, count);
3056 if (val < 0)
3057 return val;
3058
3059 if (dent == dfs_chk_gen)
3060 ubifs_dbg.chk_gen = val;
3061 else if (dent == dfs_chk_index)
3062 ubifs_dbg.chk_index = val;
3063 else if (dent == dfs_chk_orph)
3064 ubifs_dbg.chk_orph = val;
3065 else if (dent == dfs_chk_lprops)
3066 ubifs_dbg.chk_lprops = val;
3067 else if (dent == dfs_chk_fs)
3068 ubifs_dbg.chk_fs = val;
3069 else if (dent == dfs_tst_rcvry)
3070 ubifs_dbg.tst_rcvry = val;
3071 else
3072 return -EINVAL;
3073
3074 return count;
3075 }
3076
3077 static const struct file_operations dfs_global_fops = {
3078 .read = dfs_global_file_read,
3079 .write = dfs_global_file_write,
3080 .owner = THIS_MODULE,
3081 .llseek = no_llseek,
3082 };
3083
3084 /**
3085 * dbg_debugfs_init - initialize debugfs file-system.
3086 *
3087 * UBIFS uses debugfs file-system to expose various debugging knobs to
3088 * user-space. This function creates "ubifs" directory in the debugfs
3089 * file-system. Returns zero in case of success and a negative error code in
3090 * case of failure.
3091 */
3092 int dbg_debugfs_init(void)
3093 {
3094 int err;
3095 const char *fname;
3096 struct dentry *dent;
3097
3098 fname = "ubifs";
3099 dent = debugfs_create_dir(fname, NULL);
3100 if (IS_ERR_OR_NULL(dent))
3101 goto out;
3102 dfs_rootdir = dent;
3103
3104 fname = "chk_general";
3105 dent = debugfs_create_file(fname, S_IRUSR | S_IWUSR, dfs_rootdir, NULL,
3106 &dfs_global_fops);
3107 if (IS_ERR_OR_NULL(dent))
3108 goto out_remove;
3109 dfs_chk_gen = dent;
3110
3111 fname = "chk_index";
3112 dent = debugfs_create_file(fname, S_IRUSR | S_IWUSR, dfs_rootdir, NULL,
3113 &dfs_global_fops);
3114 if (IS_ERR_OR_NULL(dent))
3115 goto out_remove;
3116 dfs_chk_index = dent;
3117
3118 fname = "chk_orphans";
3119 dent = debugfs_create_file(fname, S_IRUSR | S_IWUSR, dfs_rootdir, NULL,
3120 &dfs_global_fops);
3121 if (IS_ERR_OR_NULL(dent))
3122 goto out_remove;
3123 dfs_chk_orph = dent;
3124
3125 fname = "chk_lprops";
3126 dent = debugfs_create_file(fname, S_IRUSR | S_IWUSR, dfs_rootdir, NULL,
3127 &dfs_global_fops);
3128 if (IS_ERR_OR_NULL(dent))
3129 goto out_remove;
3130 dfs_chk_lprops = dent;
3131
3132 fname = "chk_fs";
3133 dent = debugfs_create_file(fname, S_IRUSR | S_IWUSR, dfs_rootdir, NULL,
3134 &dfs_global_fops);
3135 if (IS_ERR_OR_NULL(dent))
3136 goto out_remove;
3137 dfs_chk_fs = dent;
3138
3139 fname = "tst_recovery";
3140 dent = debugfs_create_file(fname, S_IRUSR | S_IWUSR, dfs_rootdir, NULL,
3141 &dfs_global_fops);
3142 if (IS_ERR_OR_NULL(dent))
3143 goto out_remove;
3144 dfs_tst_rcvry = dent;
3145
3146 return 0;
3147
3148 out_remove:
3149 debugfs_remove_recursive(dfs_rootdir);
3150 out:
3151 err = dent ? PTR_ERR(dent) : -ENODEV;
3152 ubifs_err("cannot create \"%s\" debugfs file or directory, error %d\n",
3153 fname, err);
3154 return err;
3155 }
3156
3157 /**
3158 * dbg_debugfs_exit - remove the "ubifs" directory from debugfs file-system.
3159 */
3160 void dbg_debugfs_exit(void)
3161 {
3162 debugfs_remove_recursive(dfs_rootdir);
3163 }
3164
3165 /**
3166 * ubifs_debugging_init - initialize UBIFS debugging.
3167 * @c: UBIFS file-system description object
3168 *
3169 * This function initializes debugging-related data for the file system.
3170 * Returns zero in case of success and a negative error code in case of
3171 * failure.
3172 */
3173 int ubifs_debugging_init(struct ubifs_info *c)
3174 {
3175 c->dbg = kzalloc(sizeof(struct ubifs_debug_info), GFP_KERNEL);
3176 if (!c->dbg)
3177 return -ENOMEM;
3178
3179 return 0;
3180 }
3181
3182 /**
3183 * ubifs_debugging_exit - free debugging data.
3184 * @c: UBIFS file-system description object
3185 */
3186 void ubifs_debugging_exit(struct ubifs_info *c)
3187 {
3188 kfree(c->dbg);
3189 }
3190
3191 #endif /* CONFIG_UBIFS_FS_DEBUG */
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