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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
37static DEFINE_SPINLOCK(dbg_lock);
38
39static const char *get_key_fmt(int fmt)
40{
41 switch (fmt) {
42 case UBIFS_SIMPLE_KEY_FMT:
43 return "simple";
44 default:
45 return "unknown/invalid format";
46 }
47}
48
49static const char *get_key_hash(int hash)
50{
51 switch (hash) {
52 case UBIFS_KEY_HASH_R5:
53 return "R5";
54 case UBIFS_KEY_HASH_TEST:
55 return "test";
56 default:
57 return "unknown/invalid name hash";
58 }
59}
60
61static const char *get_key_type(int type)
62{
63 switch (type) {
64 case UBIFS_INO_KEY:
65 return "inode";
66 case UBIFS_DENT_KEY:
67 return "direntry";
68 case UBIFS_XENT_KEY:
69 return "xentry";
70 case UBIFS_DATA_KEY:
71 return "data";
72 case UBIFS_TRUN_KEY:
73 return "truncate";
74 default:
75 return "unknown/invalid key";
76 }
77}
78
79static const char *get_dent_type(int type)
80{
81 switch (type) {
82 case UBIFS_ITYPE_REG:
83 return "file";
84 case UBIFS_ITYPE_DIR:
85 return "dir";
86 case UBIFS_ITYPE_LNK:
87 return "symlink";
88 case UBIFS_ITYPE_BLK:
89 return "blkdev";
90 case UBIFS_ITYPE_CHR:
91 return "char dev";
92 case UBIFS_ITYPE_FIFO:
93 return "fifo";
94 case UBIFS_ITYPE_SOCK:
95 return "socket";
96 default:
97 return "unknown/invalid type";
98 }
99}
100
101const char *dbg_snprintf_key(const struct ubifs_info *c,
102 const union ubifs_key *key, char *buffer, int len)
103{
104 char *p = buffer;
105 int type = key_type(c, key);
106
107 if (c->key_fmt == UBIFS_SIMPLE_KEY_FMT) {
108 switch (type) {
109 case UBIFS_INO_KEY:
110 len -= snprintf(p, len, "(%lu, %s)",
111 (unsigned long)key_inum(c, key),
112 get_key_type(type));
113 break;
114 case UBIFS_DENT_KEY:
115 case UBIFS_XENT_KEY:
116 len -= snprintf(p, len, "(%lu, %s, %#08x)",
117 (unsigned long)key_inum(c, key),
118 get_key_type(type), key_hash(c, key));
119 break;
120 case UBIFS_DATA_KEY:
121 len -= snprintf(p, len, "(%lu, %s, %u)",
122 (unsigned long)key_inum(c, key),
123 get_key_type(type), key_block(c, key));
124 break;
125 case UBIFS_TRUN_KEY:
126 len -= snprintf(p, len, "(%lu, %s)",
127 (unsigned long)key_inum(c, key),
128 get_key_type(type));
129 break;
130 default:
131 len -= snprintf(p, len, "(bad key type: %#08x, %#08x)",
132 key->u32[0], key->u32[1]);
133 }
134 } else
135 len -= snprintf(p, len, "bad key format %d", c->key_fmt);
136 ubifs_assert(len > 0);
137 return p;
138}
139
140const char *dbg_ntype(int type)
141{
142 switch (type) {
143 case UBIFS_PAD_NODE:
144 return "padding node";
145 case UBIFS_SB_NODE:
146 return "superblock node";
147 case UBIFS_MST_NODE:
148 return "master node";
149 case UBIFS_REF_NODE:
150 return "reference node";
151 case UBIFS_INO_NODE:
152 return "inode node";
153 case UBIFS_DENT_NODE:
154 return "direntry node";
155 case UBIFS_XENT_NODE:
156 return "xentry node";
157 case UBIFS_DATA_NODE:
158 return "data node";
159 case UBIFS_TRUN_NODE:
160 return "truncate node";
161 case UBIFS_IDX_NODE:
162 return "indexing node";
163 case UBIFS_CS_NODE:
164 return "commit start node";
165 case UBIFS_ORPH_NODE:
166 return "orphan node";
167 default:
168 return "unknown node";
169 }
170}
171
172static const char *dbg_gtype(int type)
173{
174 switch (type) {
175 case UBIFS_NO_NODE_GROUP:
176 return "no node group";
177 case UBIFS_IN_NODE_GROUP:
178 return "in node group";
179 case UBIFS_LAST_OF_NODE_GROUP:
180 return "last of node group";
181 default:
182 return "unknown";
183 }
184}
185
186const char *dbg_cstate(int cmt_state)
187{
188 switch (cmt_state) {
189 case COMMIT_RESTING:
190 return "commit resting";
191 case COMMIT_BACKGROUND:
192 return "background commit requested";
193 case COMMIT_REQUIRED:
194 return "commit required";
195 case COMMIT_RUNNING_BACKGROUND:
196 return "BACKGROUND commit running";
197 case COMMIT_RUNNING_REQUIRED:
198 return "commit running and required";
199 case COMMIT_BROKEN:
200 return "broken commit";
201 default:
202 return "unknown commit state";
203 }
204}
205
206const char *dbg_jhead(int jhead)
207{
208 switch (jhead) {
209 case GCHD:
210 return "0 (GC)";
211 case BASEHD:
212 return "1 (base)";
213 case DATAHD:
214 return "2 (data)";
215 default:
216 return "unknown journal head";
217 }
218}
219
220static void dump_ch(const struct ubifs_ch *ch)
221{
222 pr_err("\tmagic %#x\n", le32_to_cpu(ch->magic));
223 pr_err("\tcrc %#x\n", le32_to_cpu(ch->crc));
224 pr_err("\tnode_type %d (%s)\n", ch->node_type,
225 dbg_ntype(ch->node_type));
226 pr_err("\tgroup_type %d (%s)\n", ch->group_type,
227 dbg_gtype(ch->group_type));
228 pr_err("\tsqnum %llu\n",
229 (unsigned long long)le64_to_cpu(ch->sqnum));
230 pr_err("\tlen %u\n", le32_to_cpu(ch->len));
231}
232
233void ubifs_dump_inode(struct ubifs_info *c, const struct inode *inode)
234{
235 const struct ubifs_inode *ui = ubifs_inode(inode);
236 struct qstr nm = { .name = NULL };
237 union ubifs_key key;
238 struct ubifs_dent_node *dent, *pdent = NULL;
239 int count = 2;
240
241 pr_err("Dump in-memory inode:");
242 pr_err("\tinode %lu\n", inode->i_ino);
243 pr_err("\tsize %llu\n",
244 (unsigned long long)i_size_read(inode));
245 pr_err("\tnlink %u\n", inode->i_nlink);
246 pr_err("\tuid %u\n", (unsigned int)i_uid_read(inode));
247 pr_err("\tgid %u\n", (unsigned int)i_gid_read(inode));
248 pr_err("\tatime %u.%u\n",
249 (unsigned int)inode->i_atime.tv_sec,
250 (unsigned int)inode->i_atime.tv_nsec);
251 pr_err("\tmtime %u.%u\n",
252 (unsigned int)inode->i_mtime.tv_sec,
253 (unsigned int)inode->i_mtime.tv_nsec);
254 pr_err("\tctime %u.%u\n",
255 (unsigned int)inode->i_ctime.tv_sec,
256 (unsigned int)inode->i_ctime.tv_nsec);
257 pr_err("\tcreat_sqnum %llu\n", ui->creat_sqnum);
258 pr_err("\txattr_size %u\n", ui->xattr_size);
259 pr_err("\txattr_cnt %u\n", ui->xattr_cnt);
260 pr_err("\txattr_names %u\n", ui->xattr_names);
261 pr_err("\tdirty %u\n", ui->dirty);
262 pr_err("\txattr %u\n", ui->xattr);
263 pr_err("\tbulk_read %u\n", ui->xattr);
264 pr_err("\tsynced_i_size %llu\n",
265 (unsigned long long)ui->synced_i_size);
266 pr_err("\tui_size %llu\n",
267 (unsigned long long)ui->ui_size);
268 pr_err("\tflags %d\n", ui->flags);
269 pr_err("\tcompr_type %d\n", ui->compr_type);
270 pr_err("\tlast_page_read %lu\n", ui->last_page_read);
271 pr_err("\tread_in_a_row %lu\n", ui->read_in_a_row);
272 pr_err("\tdata_len %d\n", ui->data_len);
273
274 if (!S_ISDIR(inode->i_mode))
275 return;
276
277 pr_err("List of directory entries:\n");
278 ubifs_assert(!mutex_is_locked(&c->tnc_mutex));
279
280 lowest_dent_key(c, &key, inode->i_ino);
281 while (1) {
282 dent = ubifs_tnc_next_ent(c, &key, &nm);
283 if (IS_ERR(dent)) {
284 if (PTR_ERR(dent) != -ENOENT)
285 pr_err("error %ld\n", PTR_ERR(dent));
286 break;
287 }
288
289 pr_err("\t%d: %s (%s)\n",
290 count++, dent->name, get_dent_type(dent->type));
291
292 nm.name = dent->name;
293 nm.len = le16_to_cpu(dent->nlen);
294 kfree(pdent);
295 pdent = dent;
296 key_read(c, &dent->key, &key);
297 }
298 kfree(pdent);
299}
300
301void ubifs_dump_node(const struct ubifs_info *c, const void *node)
302{
303 int i, n;
304 union ubifs_key key;
305 const struct ubifs_ch *ch = node;
306 char key_buf[DBG_KEY_BUF_LEN];
307
308 /* If the magic is incorrect, just hexdump the first bytes */
309 if (le32_to_cpu(ch->magic) != UBIFS_NODE_MAGIC) {
310 pr_err("Not a node, first %zu bytes:", UBIFS_CH_SZ);
311 print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 32, 1,
312 (void *)node, UBIFS_CH_SZ, 1);
313 return;
314 }
315
316 spin_lock(&dbg_lock);
317 dump_ch(node);
318
319 switch (ch->node_type) {
320 case UBIFS_PAD_NODE:
321 {
322 const struct ubifs_pad_node *pad = node;
323
324 pr_err("\tpad_len %u\n", le32_to_cpu(pad->pad_len));
325 break;
326 }
327 case UBIFS_SB_NODE:
328 {
329 const struct ubifs_sb_node *sup = node;
330 unsigned int sup_flags = le32_to_cpu(sup->flags);
331
332 pr_err("\tkey_hash %d (%s)\n",
333 (int)sup->key_hash, get_key_hash(sup->key_hash));
334 pr_err("\tkey_fmt %d (%s)\n",
335 (int)sup->key_fmt, get_key_fmt(sup->key_fmt));
336 pr_err("\tflags %#x\n", sup_flags);
337 pr_err("\tbig_lpt %u\n",
338 !!(sup_flags & UBIFS_FLG_BIGLPT));
339 pr_err("\tspace_fixup %u\n",
340 !!(sup_flags & UBIFS_FLG_SPACE_FIXUP));
341 pr_err("\tmin_io_size %u\n", le32_to_cpu(sup->min_io_size));
342 pr_err("\tleb_size %u\n", le32_to_cpu(sup->leb_size));
343 pr_err("\tleb_cnt %u\n", le32_to_cpu(sup->leb_cnt));
344 pr_err("\tmax_leb_cnt %u\n", le32_to_cpu(sup->max_leb_cnt));
345 pr_err("\tmax_bud_bytes %llu\n",
346 (unsigned long long)le64_to_cpu(sup->max_bud_bytes));
347 pr_err("\tlog_lebs %u\n", le32_to_cpu(sup->log_lebs));
348 pr_err("\tlpt_lebs %u\n", le32_to_cpu(sup->lpt_lebs));
349 pr_err("\torph_lebs %u\n", le32_to_cpu(sup->orph_lebs));
350 pr_err("\tjhead_cnt %u\n", le32_to_cpu(sup->jhead_cnt));
351 pr_err("\tfanout %u\n", le32_to_cpu(sup->fanout));
352 pr_err("\tlsave_cnt %u\n", le32_to_cpu(sup->lsave_cnt));
353 pr_err("\tdefault_compr %u\n",
354 (int)le16_to_cpu(sup->default_compr));
355 pr_err("\trp_size %llu\n",
356 (unsigned long long)le64_to_cpu(sup->rp_size));
357 pr_err("\trp_uid %u\n", le32_to_cpu(sup->rp_uid));
358 pr_err("\trp_gid %u\n", le32_to_cpu(sup->rp_gid));
359 pr_err("\tfmt_version %u\n", le32_to_cpu(sup->fmt_version));
360 pr_err("\ttime_gran %u\n", le32_to_cpu(sup->time_gran));
361 pr_err("\tUUID %pUB\n", sup->uuid);
362 break;
363 }
364 case UBIFS_MST_NODE:
365 {
366 const struct ubifs_mst_node *mst = node;
367
368 pr_err("\thighest_inum %llu\n",
369 (unsigned long long)le64_to_cpu(mst->highest_inum));
370 pr_err("\tcommit number %llu\n",
371 (unsigned long long)le64_to_cpu(mst->cmt_no));
372 pr_err("\tflags %#x\n", le32_to_cpu(mst->flags));
373 pr_err("\tlog_lnum %u\n", le32_to_cpu(mst->log_lnum));
374 pr_err("\troot_lnum %u\n", le32_to_cpu(mst->root_lnum));
375 pr_err("\troot_offs %u\n", le32_to_cpu(mst->root_offs));
376 pr_err("\troot_len %u\n", le32_to_cpu(mst->root_len));
377 pr_err("\tgc_lnum %u\n", le32_to_cpu(mst->gc_lnum));
378 pr_err("\tihead_lnum %u\n", le32_to_cpu(mst->ihead_lnum));
379 pr_err("\tihead_offs %u\n", le32_to_cpu(mst->ihead_offs));
380 pr_err("\tindex_size %llu\n",
381 (unsigned long long)le64_to_cpu(mst->index_size));
382 pr_err("\tlpt_lnum %u\n", le32_to_cpu(mst->lpt_lnum));
383 pr_err("\tlpt_offs %u\n", le32_to_cpu(mst->lpt_offs));
384 pr_err("\tnhead_lnum %u\n", le32_to_cpu(mst->nhead_lnum));
385 pr_err("\tnhead_offs %u\n", le32_to_cpu(mst->nhead_offs));
386 pr_err("\tltab_lnum %u\n", le32_to_cpu(mst->ltab_lnum));
387 pr_err("\tltab_offs %u\n", le32_to_cpu(mst->ltab_offs));
388 pr_err("\tlsave_lnum %u\n", le32_to_cpu(mst->lsave_lnum));
389 pr_err("\tlsave_offs %u\n", le32_to_cpu(mst->lsave_offs));
390 pr_err("\tlscan_lnum %u\n", le32_to_cpu(mst->lscan_lnum));
391 pr_err("\tleb_cnt %u\n", le32_to_cpu(mst->leb_cnt));
392 pr_err("\tempty_lebs %u\n", le32_to_cpu(mst->empty_lebs));
393 pr_err("\tidx_lebs %u\n", le32_to_cpu(mst->idx_lebs));
394 pr_err("\ttotal_free %llu\n",
395 (unsigned long long)le64_to_cpu(mst->total_free));
396 pr_err("\ttotal_dirty %llu\n",
397 (unsigned long long)le64_to_cpu(mst->total_dirty));
398 pr_err("\ttotal_used %llu\n",
399 (unsigned long long)le64_to_cpu(mst->total_used));
400 pr_err("\ttotal_dead %llu\n",
401 (unsigned long long)le64_to_cpu(mst->total_dead));
402 pr_err("\ttotal_dark %llu\n",
403 (unsigned long long)le64_to_cpu(mst->total_dark));
404 break;
405 }
406 case UBIFS_REF_NODE:
407 {
408 const struct ubifs_ref_node *ref = node;
409
410 pr_err("\tlnum %u\n", le32_to_cpu(ref->lnum));
411 pr_err("\toffs %u\n", le32_to_cpu(ref->offs));
412 pr_err("\tjhead %u\n", le32_to_cpu(ref->jhead));
413 break;
414 }
415 case UBIFS_INO_NODE:
416 {
417 const struct ubifs_ino_node *ino = node;
418
419 key_read(c, &ino->key, &key);
420 pr_err("\tkey %s\n",
421 dbg_snprintf_key(c, &key, key_buf, DBG_KEY_BUF_LEN));
422 pr_err("\tcreat_sqnum %llu\n",
423 (unsigned long long)le64_to_cpu(ino->creat_sqnum));
424 pr_err("\tsize %llu\n",
425 (unsigned long long)le64_to_cpu(ino->size));
426 pr_err("\tnlink %u\n", le32_to_cpu(ino->nlink));
427 pr_err("\tatime %lld.%u\n",
428 (long long)le64_to_cpu(ino->atime_sec),
429 le32_to_cpu(ino->atime_nsec));
430 pr_err("\tmtime %lld.%u\n",
431 (long long)le64_to_cpu(ino->mtime_sec),
432 le32_to_cpu(ino->mtime_nsec));
433 pr_err("\tctime %lld.%u\n",
434 (long long)le64_to_cpu(ino->ctime_sec),
435 le32_to_cpu(ino->ctime_nsec));
436 pr_err("\tuid %u\n", le32_to_cpu(ino->uid));
437 pr_err("\tgid %u\n", le32_to_cpu(ino->gid));
438 pr_err("\tmode %u\n", le32_to_cpu(ino->mode));
439 pr_err("\tflags %#x\n", le32_to_cpu(ino->flags));
440 pr_err("\txattr_cnt %u\n", le32_to_cpu(ino->xattr_cnt));
441 pr_err("\txattr_size %u\n", le32_to_cpu(ino->xattr_size));
442 pr_err("\txattr_names %u\n", le32_to_cpu(ino->xattr_names));
443 pr_err("\tcompr_type %#x\n",
444 (int)le16_to_cpu(ino->compr_type));
445 pr_err("\tdata len %u\n", le32_to_cpu(ino->data_len));
446 break;
447 }
448 case UBIFS_DENT_NODE:
449 case UBIFS_XENT_NODE:
450 {
451 const struct ubifs_dent_node *dent = node;
452 int nlen = le16_to_cpu(dent->nlen);
453
454 key_read(c, &dent->key, &key);
455 pr_err("\tkey %s\n",
456 dbg_snprintf_key(c, &key, key_buf, DBG_KEY_BUF_LEN));
457 pr_err("\tinum %llu\n",
458 (unsigned long long)le64_to_cpu(dent->inum));
459 pr_err("\ttype %d\n", (int)dent->type);
460 pr_err("\tnlen %d\n", nlen);
461 pr_err("\tname ");
462
463 if (nlen > UBIFS_MAX_NLEN)
464 pr_err("(bad name length, not printing, bad or corrupted node)");
465 else {
466 for (i = 0; i < nlen && dent->name[i]; i++)
467 pr_cont("%c", dent->name[i]);
468 }
469 pr_cont("\n");
470
471 break;
472 }
473 case UBIFS_DATA_NODE:
474 {
475 const struct ubifs_data_node *dn = node;
476 int dlen = le32_to_cpu(ch->len) - UBIFS_DATA_NODE_SZ;
477
478 key_read(c, &dn->key, &key);
479 pr_err("\tkey %s\n",
480 dbg_snprintf_key(c, &key, key_buf, DBG_KEY_BUF_LEN));
481 pr_err("\tsize %u\n", le32_to_cpu(dn->size));
482 pr_err("\tcompr_typ %d\n",
483 (int)le16_to_cpu(dn->compr_type));
484 pr_err("\tdata size %d\n", dlen);
485 pr_err("\tdata:\n");
486 print_hex_dump(KERN_ERR, "\t", DUMP_PREFIX_OFFSET, 32, 1,
487 (void *)&dn->data, dlen, 0);
488 break;
489 }
490 case UBIFS_TRUN_NODE:
491 {
492 const struct ubifs_trun_node *trun = node;
493
494 pr_err("\tinum %u\n", le32_to_cpu(trun->inum));
495 pr_err("\told_size %llu\n",
496 (unsigned long long)le64_to_cpu(trun->old_size));
497 pr_err("\tnew_size %llu\n",
498 (unsigned long long)le64_to_cpu(trun->new_size));
499 break;
500 }
501 case UBIFS_IDX_NODE:
502 {
503 const struct ubifs_idx_node *idx = node;
504
505 n = le16_to_cpu(idx->child_cnt);
506 pr_err("\tchild_cnt %d\n", n);
507 pr_err("\tlevel %d\n", (int)le16_to_cpu(idx->level));
508 pr_err("\tBranches:\n");
509
510 for (i = 0; i < n && i < c->fanout - 1; i++) {
511 const struct ubifs_branch *br;
512
513 br = ubifs_idx_branch(c, idx, i);
514 key_read(c, &br->key, &key);
515 pr_err("\t%d: LEB %d:%d len %d key %s\n",
516 i, le32_to_cpu(br->lnum), le32_to_cpu(br->offs),
517 le32_to_cpu(br->len),
518 dbg_snprintf_key(c, &key, key_buf,
519 DBG_KEY_BUF_LEN));
520 }
521 break;
522 }
523 case UBIFS_CS_NODE:
524 break;
525 case UBIFS_ORPH_NODE:
526 {
527 const struct ubifs_orph_node *orph = node;
528
529 pr_err("\tcommit number %llu\n",
530 (unsigned long long)
531 le64_to_cpu(orph->cmt_no) & LLONG_MAX);
532 pr_err("\tlast node flag %llu\n",
533 (unsigned long long)(le64_to_cpu(orph->cmt_no)) >> 63);
534 n = (le32_to_cpu(ch->len) - UBIFS_ORPH_NODE_SZ) >> 3;
535 pr_err("\t%d orphan inode numbers:\n", n);
536 for (i = 0; i < n; i++)
537 pr_err("\t ino %llu\n",
538 (unsigned long long)le64_to_cpu(orph->inos[i]));
539 break;
540 }
541 default:
542 pr_err("node type %d was not recognized\n",
543 (int)ch->node_type);
544 }
545 spin_unlock(&dbg_lock);
546}
547
548void ubifs_dump_budget_req(const struct ubifs_budget_req *req)
549{
550 spin_lock(&dbg_lock);
551 pr_err("Budgeting request: new_ino %d, dirtied_ino %d\n",
552 req->new_ino, req->dirtied_ino);
553 pr_err("\tnew_ino_d %d, dirtied_ino_d %d\n",
554 req->new_ino_d, req->dirtied_ino_d);
555 pr_err("\tnew_page %d, dirtied_page %d\n",
556 req->new_page, req->dirtied_page);
557 pr_err("\tnew_dent %d, mod_dent %d\n",
558 req->new_dent, req->mod_dent);
559 pr_err("\tidx_growth %d\n", req->idx_growth);
560 pr_err("\tdata_growth %d dd_growth %d\n",
561 req->data_growth, req->dd_growth);
562 spin_unlock(&dbg_lock);
563}
564
565void ubifs_dump_lstats(const struct ubifs_lp_stats *lst)
566{
567 spin_lock(&dbg_lock);
568 pr_err("(pid %d) Lprops statistics: empty_lebs %d, idx_lebs %d\n",
569 current->pid, lst->empty_lebs, lst->idx_lebs);
570 pr_err("\ttaken_empty_lebs %d, total_free %lld, total_dirty %lld\n",
571 lst->taken_empty_lebs, lst->total_free, lst->total_dirty);
572 pr_err("\ttotal_used %lld, total_dark %lld, total_dead %lld\n",
573 lst->total_used, lst->total_dark, lst->total_dead);
574 spin_unlock(&dbg_lock);
575}
576
577void ubifs_dump_budg(struct ubifs_info *c, const struct ubifs_budg_info *bi)
578{
579 int i;
580 struct rb_node *rb;
581 struct ubifs_bud *bud;
582 struct ubifs_gced_idx_leb *idx_gc;
583 long long available, outstanding, free;
584
585 spin_lock(&c->space_lock);
586 spin_lock(&dbg_lock);
587 pr_err("(pid %d) Budgeting info: data budget sum %lld, total budget sum %lld\n",
588 current->pid, bi->data_growth + bi->dd_growth,
589 bi->data_growth + bi->dd_growth + bi->idx_growth);
590 pr_err("\tbudg_data_growth %lld, budg_dd_growth %lld, budg_idx_growth %lld\n",
591 bi->data_growth, bi->dd_growth, bi->idx_growth);
592 pr_err("\tmin_idx_lebs %d, old_idx_sz %llu, uncommitted_idx %lld\n",
593 bi->min_idx_lebs, bi->old_idx_sz, bi->uncommitted_idx);
594 pr_err("\tpage_budget %d, inode_budget %d, dent_budget %d\n",
595 bi->page_budget, bi->inode_budget, bi->dent_budget);
596 pr_err("\tnospace %u, nospace_rp %u\n", bi->nospace, bi->nospace_rp);
597 pr_err("\tdark_wm %d, dead_wm %d, max_idx_node_sz %d\n",
598 c->dark_wm, c->dead_wm, c->max_idx_node_sz);
599
600 if (bi != &c->bi)
601 /*
602 * If we are dumping saved budgeting data, do not print
603 * additional information which is about the current state, not
604 * the old one which corresponded to the saved budgeting data.
605 */
606 goto out_unlock;
607
608 pr_err("\tfreeable_cnt %d, calc_idx_sz %lld, idx_gc_cnt %d\n",
609 c->freeable_cnt, c->calc_idx_sz, c->idx_gc_cnt);
610 pr_err("\tdirty_pg_cnt %ld, dirty_zn_cnt %ld, clean_zn_cnt %ld\n",
611 atomic_long_read(&c->dirty_pg_cnt),
612 atomic_long_read(&c->dirty_zn_cnt),
613 atomic_long_read(&c->clean_zn_cnt));
614 pr_err("\tgc_lnum %d, ihead_lnum %d\n", c->gc_lnum, c->ihead_lnum);
615
616 /* If we are in R/O mode, journal heads do not exist */
617 if (c->jheads)
618 for (i = 0; i < c->jhead_cnt; i++)
619 pr_err("\tjhead %s\t LEB %d\n",
620 dbg_jhead(c->jheads[i].wbuf.jhead),
621 c->jheads[i].wbuf.lnum);
622 for (rb = rb_first(&c->buds); rb; rb = rb_next(rb)) {
623 bud = rb_entry(rb, struct ubifs_bud, rb);
624 pr_err("\tbud LEB %d\n", bud->lnum);
625 }
626 list_for_each_entry(bud, &c->old_buds, list)
627 pr_err("\told bud LEB %d\n", bud->lnum);
628 list_for_each_entry(idx_gc, &c->idx_gc, list)
629 pr_err("\tGC'ed idx LEB %d unmap %d\n",
630 idx_gc->lnum, idx_gc->unmap);
631 pr_err("\tcommit state %d\n", c->cmt_state);
632
633 /* Print budgeting predictions */
634 available = ubifs_calc_available(c, c->bi.min_idx_lebs);
635 outstanding = c->bi.data_growth + c->bi.dd_growth;
636 free = ubifs_get_free_space_nolock(c);
637 pr_err("Budgeting predictions:\n");
638 pr_err("\tavailable: %lld, outstanding %lld, free %lld\n",
639 available, outstanding, free);
640out_unlock:
641 spin_unlock(&dbg_lock);
642 spin_unlock(&c->space_lock);
643}
644
645void ubifs_dump_lprop(const struct ubifs_info *c, const struct ubifs_lprops *lp)
646{
647 int i, spc, dark = 0, dead = 0;
648 struct rb_node *rb;
649 struct ubifs_bud *bud;
650
651 spc = lp->free + lp->dirty;
652 if (spc < c->dead_wm)
653 dead = spc;
654 else
655 dark = ubifs_calc_dark(c, spc);
656
657 if (lp->flags & LPROPS_INDEX)
658 pr_err("LEB %-7d free %-8d dirty %-8d used %-8d free + dirty %-8d flags %#x (",
659 lp->lnum, lp->free, lp->dirty, c->leb_size - spc, spc,
660 lp->flags);
661 else
662 pr_err("LEB %-7d free %-8d dirty %-8d used %-8d free + dirty %-8d dark %-4d dead %-4d nodes fit %-3d flags %#-4x (",
663 lp->lnum, lp->free, lp->dirty, c->leb_size - spc, spc,
664 dark, dead, (int)(spc / UBIFS_MAX_NODE_SZ), lp->flags);
665
666 if (lp->flags & LPROPS_TAKEN) {
667 if (lp->flags & LPROPS_INDEX)
668 pr_cont("index, taken");
669 else
670 pr_cont("taken");
671 } else {
672 const char *s;
673
674 if (lp->flags & LPROPS_INDEX) {
675 switch (lp->flags & LPROPS_CAT_MASK) {
676 case LPROPS_DIRTY_IDX:
677 s = "dirty index";
678 break;
679 case LPROPS_FRDI_IDX:
680 s = "freeable index";
681 break;
682 default:
683 s = "index";
684 }
685 } else {
686 switch (lp->flags & LPROPS_CAT_MASK) {
687 case LPROPS_UNCAT:
688 s = "not categorized";
689 break;
690 case LPROPS_DIRTY:
691 s = "dirty";
692 break;
693 case LPROPS_FREE:
694 s = "free";
695 break;
696 case LPROPS_EMPTY:
697 s = "empty";
698 break;
699 case LPROPS_FREEABLE:
700 s = "freeable";
701 break;
702 default:
703 s = NULL;
704 break;
705 }
706 }
707 pr_cont("%s", s);
708 }
709
710 for (rb = rb_first((struct rb_root *)&c->buds); rb; rb = rb_next(rb)) {
711 bud = rb_entry(rb, struct ubifs_bud, rb);
712 if (bud->lnum == lp->lnum) {
713 int head = 0;
714 for (i = 0; i < c->jhead_cnt; i++) {
715 /*
716 * Note, if we are in R/O mode or in the middle
717 * of mounting/re-mounting, the write-buffers do
718 * not exist.
719 */
720 if (c->jheads &&
721 lp->lnum == c->jheads[i].wbuf.lnum) {
722 pr_cont(", jhead %s", dbg_jhead(i));
723 head = 1;
724 }
725 }
726 if (!head)
727 pr_cont(", bud of jhead %s",
728 dbg_jhead(bud->jhead));
729 }
730 }
731 if (lp->lnum == c->gc_lnum)
732 pr_cont(", GC LEB");
733 pr_cont(")\n");
734}
735
736void ubifs_dump_lprops(struct ubifs_info *c)
737{
738 int lnum, err;
739 struct ubifs_lprops lp;
740 struct ubifs_lp_stats lst;
741
742 pr_err("(pid %d) start dumping LEB properties\n", current->pid);
743 ubifs_get_lp_stats(c, &lst);
744 ubifs_dump_lstats(&lst);
745
746 for (lnum = c->main_first; lnum < c->leb_cnt; lnum++) {
747 err = ubifs_read_one_lp(c, lnum, &lp);
748 if (err) {
749 ubifs_err(c, "cannot read lprops for LEB %d", lnum);
750 continue;
751 }
752
753 ubifs_dump_lprop(c, &lp);
754 }
755 pr_err("(pid %d) finish dumping LEB properties\n", current->pid);
756}
757
758void ubifs_dump_lpt_info(struct ubifs_info *c)
759{
760 int i;
761
762 spin_lock(&dbg_lock);
763 pr_err("(pid %d) dumping LPT information\n", current->pid);
764 pr_err("\tlpt_sz: %lld\n", c->lpt_sz);
765 pr_err("\tpnode_sz: %d\n", c->pnode_sz);
766 pr_err("\tnnode_sz: %d\n", c->nnode_sz);
767 pr_err("\tltab_sz: %d\n", c->ltab_sz);
768 pr_err("\tlsave_sz: %d\n", c->lsave_sz);
769 pr_err("\tbig_lpt: %d\n", c->big_lpt);
770 pr_err("\tlpt_hght: %d\n", c->lpt_hght);
771 pr_err("\tpnode_cnt: %d\n", c->pnode_cnt);
772 pr_err("\tnnode_cnt: %d\n", c->nnode_cnt);
773 pr_err("\tdirty_pn_cnt: %d\n", c->dirty_pn_cnt);
774 pr_err("\tdirty_nn_cnt: %d\n", c->dirty_nn_cnt);
775 pr_err("\tlsave_cnt: %d\n", c->lsave_cnt);
776 pr_err("\tspace_bits: %d\n", c->space_bits);
777 pr_err("\tlpt_lnum_bits: %d\n", c->lpt_lnum_bits);
778 pr_err("\tlpt_offs_bits: %d\n", c->lpt_offs_bits);
779 pr_err("\tlpt_spc_bits: %d\n", c->lpt_spc_bits);
780 pr_err("\tpcnt_bits: %d\n", c->pcnt_bits);
781 pr_err("\tlnum_bits: %d\n", c->lnum_bits);
782 pr_err("\tLPT root is at %d:%d\n", c->lpt_lnum, c->lpt_offs);
783 pr_err("\tLPT head is at %d:%d\n",
784 c->nhead_lnum, c->nhead_offs);
785 pr_err("\tLPT ltab is at %d:%d\n", c->ltab_lnum, c->ltab_offs);
786 if (c->big_lpt)
787 pr_err("\tLPT lsave is at %d:%d\n",
788 c->lsave_lnum, c->lsave_offs);
789 for (i = 0; i < c->lpt_lebs; i++)
790 pr_err("\tLPT LEB %d free %d dirty %d tgc %d cmt %d\n",
791 i + c->lpt_first, c->ltab[i].free, c->ltab[i].dirty,
792 c->ltab[i].tgc, c->ltab[i].cmt);
793 spin_unlock(&dbg_lock);
794}
795
796void ubifs_dump_sleb(const struct ubifs_info *c,
797 const struct ubifs_scan_leb *sleb, int offs)
798{
799 struct ubifs_scan_node *snod;
800
801 pr_err("(pid %d) start dumping scanned data from LEB %d:%d\n",
802 current->pid, sleb->lnum, offs);
803
804 list_for_each_entry(snod, &sleb->nodes, list) {
805 cond_resched();
806 pr_err("Dumping node at LEB %d:%d len %d\n",
807 sleb->lnum, snod->offs, snod->len);
808 ubifs_dump_node(c, snod->node);
809 }
810}
811
812void ubifs_dump_leb(const struct ubifs_info *c, int lnum)
813{
814 struct ubifs_scan_leb *sleb;
815 struct ubifs_scan_node *snod;
816 void *buf;
817
818 pr_err("(pid %d) start dumping LEB %d\n", current->pid, lnum);
819
820 buf = __vmalloc(c->leb_size, GFP_NOFS, PAGE_KERNEL);
821 if (!buf) {
822 ubifs_err(c, "cannot allocate memory for dumping LEB %d", lnum);
823 return;
824 }
825
826 sleb = ubifs_scan(c, lnum, 0, buf, 0);
827 if (IS_ERR(sleb)) {
828 ubifs_err(c, "scan error %d", (int)PTR_ERR(sleb));
829 goto out;
830 }
831
832 pr_err("LEB %d has %d nodes ending at %d\n", lnum,
833 sleb->nodes_cnt, sleb->endpt);
834
835 list_for_each_entry(snod, &sleb->nodes, list) {
836 cond_resched();
837 pr_err("Dumping node at LEB %d:%d len %d\n", lnum,
838 snod->offs, snod->len);
839 ubifs_dump_node(c, snod->node);
840 }
841
842 pr_err("(pid %d) finish dumping LEB %d\n", current->pid, lnum);
843 ubifs_scan_destroy(sleb);
844
845out:
846 vfree(buf);
847 return;
848}
849
850void ubifs_dump_znode(const struct ubifs_info *c,
851 const struct ubifs_znode *znode)
852{
853 int n;
854 const struct ubifs_zbranch *zbr;
855 char key_buf[DBG_KEY_BUF_LEN];
856
857 spin_lock(&dbg_lock);
858 if (znode->parent)
859 zbr = &znode->parent->zbranch[znode->iip];
860 else
861 zbr = &c->zroot;
862
863 pr_err("znode %p, LEB %d:%d len %d parent %p iip %d level %d child_cnt %d flags %lx\n",
864 znode, zbr->lnum, zbr->offs, zbr->len, znode->parent, znode->iip,
865 znode->level, znode->child_cnt, znode->flags);
866
867 if (znode->child_cnt <= 0 || znode->child_cnt > c->fanout) {
868 spin_unlock(&dbg_lock);
869 return;
870 }
871
872 pr_err("zbranches:\n");
873 for (n = 0; n < znode->child_cnt; n++) {
874 zbr = &znode->zbranch[n];
875 if (znode->level > 0)
876 pr_err("\t%d: znode %p LEB %d:%d len %d key %s\n",
877 n, zbr->znode, zbr->lnum, zbr->offs, zbr->len,
878 dbg_snprintf_key(c, &zbr->key, key_buf,
879 DBG_KEY_BUF_LEN));
880 else
881 pr_err("\t%d: LNC %p LEB %d:%d len %d key %s\n",
882 n, zbr->znode, zbr->lnum, zbr->offs, zbr->len,
883 dbg_snprintf_key(c, &zbr->key, key_buf,
884 DBG_KEY_BUF_LEN));
885 }
886 spin_unlock(&dbg_lock);
887}
888
889void ubifs_dump_heap(struct ubifs_info *c, struct ubifs_lpt_heap *heap, int cat)
890{
891 int i;
892
893 pr_err("(pid %d) start dumping heap cat %d (%d elements)\n",
894 current->pid, cat, heap->cnt);
895 for (i = 0; i < heap->cnt; i++) {
896 struct ubifs_lprops *lprops = heap->arr[i];
897
898 pr_err("\t%d. LEB %d hpos %d free %d dirty %d flags %d\n",
899 i, lprops->lnum, lprops->hpos, lprops->free,
900 lprops->dirty, lprops->flags);
901 }
902 pr_err("(pid %d) finish dumping heap\n", current->pid);
903}
904
905void ubifs_dump_pnode(struct ubifs_info *c, struct ubifs_pnode *pnode,
906 struct ubifs_nnode *parent, int iip)
907{
908 int i;
909
910 pr_err("(pid %d) dumping pnode:\n", current->pid);
911 pr_err("\taddress %zx parent %zx cnext %zx\n",
912 (size_t)pnode, (size_t)parent, (size_t)pnode->cnext);
913 pr_err("\tflags %lu iip %d level %d num %d\n",
914 pnode->flags, iip, pnode->level, pnode->num);
915 for (i = 0; i < UBIFS_LPT_FANOUT; i++) {
916 struct ubifs_lprops *lp = &pnode->lprops[i];
917
918 pr_err("\t%d: free %d dirty %d flags %d lnum %d\n",
919 i, lp->free, lp->dirty, lp->flags, lp->lnum);
920 }
921}
922
923void ubifs_dump_tnc(struct ubifs_info *c)
924{
925 struct ubifs_znode *znode;
926 int level;
927
928 pr_err("\n");
929 pr_err("(pid %d) start dumping TNC tree\n", current->pid);
930 znode = ubifs_tnc_levelorder_next(c->zroot.znode, NULL);
931 level = znode->level;
932 pr_err("== Level %d ==\n", level);
933 while (znode) {
934 if (level != znode->level) {
935 level = znode->level;
936 pr_err("== Level %d ==\n", level);
937 }
938 ubifs_dump_znode(c, znode);
939 znode = ubifs_tnc_levelorder_next(c->zroot.znode, znode);
940 }
941 pr_err("(pid %d) finish dumping TNC tree\n", current->pid);
942}
943
944static int dump_znode(struct ubifs_info *c, struct ubifs_znode *znode,
945 void *priv)
946{
947 ubifs_dump_znode(c, znode);
948 return 0;
949}
950
951/**
952 * ubifs_dump_index - dump the on-flash index.
953 * @c: UBIFS file-system description object
954 *
955 * This function dumps whole UBIFS indexing B-tree, unlike 'ubifs_dump_tnc()'
956 * which dumps only in-memory znodes and does not read znodes which from flash.
957 */
958void ubifs_dump_index(struct ubifs_info *c)
959{
960 dbg_walk_index(c, NULL, dump_znode, NULL);
961}
962
963/**
964 * dbg_save_space_info - save information about flash space.
965 * @c: UBIFS file-system description object
966 *
967 * This function saves information about UBIFS free space, dirty space, etc, in
968 * order to check it later.
969 */
970void dbg_save_space_info(struct ubifs_info *c)
971{
972 struct ubifs_debug_info *d = c->dbg;
973 int freeable_cnt;
974
975 spin_lock(&c->space_lock);
976 memcpy(&d->saved_lst, &c->lst, sizeof(struct ubifs_lp_stats));
977 memcpy(&d->saved_bi, &c->bi, sizeof(struct ubifs_budg_info));
978 d->saved_idx_gc_cnt = c->idx_gc_cnt;
979
980 /*
981 * We use a dirty hack here and zero out @c->freeable_cnt, because it
982 * affects the free space calculations, and UBIFS might not know about
983 * all freeable eraseblocks. Indeed, we know about freeable eraseblocks
984 * only when we read their lprops, and we do this only lazily, upon the
985 * need. So at any given point of time @c->freeable_cnt might be not
986 * exactly accurate.
987 *
988 * Just one example about the issue we hit when we did not zero
989 * @c->freeable_cnt.
990 * 1. The file-system is mounted R/O, c->freeable_cnt is %0. We save the
991 * amount of free space in @d->saved_free
992 * 2. We re-mount R/W, which makes UBIFS to read the "lsave"
993 * information from flash, where we cache LEBs from various
994 * categories ('ubifs_remount_fs()' -> 'ubifs_lpt_init()'
995 * -> 'lpt_init_wr()' -> 'read_lsave()' -> 'ubifs_lpt_lookup()'
996 * -> 'ubifs_get_pnode()' -> 'update_cats()'
997 * -> 'ubifs_add_to_cat()').
998 * 3. Lsave contains a freeable eraseblock, and @c->freeable_cnt
999 * becomes %1.
1000 * 4. We calculate the amount of free space when the re-mount is
1001 * finished in 'dbg_check_space_info()' and it does not match
1002 * @d->saved_free.
1003 */
1004 freeable_cnt = c->freeable_cnt;
1005 c->freeable_cnt = 0;
1006 d->saved_free = ubifs_get_free_space_nolock(c);
1007 c->freeable_cnt = freeable_cnt;
1008 spin_unlock(&c->space_lock);
1009}
1010
1011/**
1012 * dbg_check_space_info - check flash space information.
1013 * @c: UBIFS file-system description object
1014 *
1015 * This function compares current flash space information with the information
1016 * which was saved when the 'dbg_save_space_info()' function was called.
1017 * Returns zero if the information has not changed, and %-EINVAL it it has
1018 * changed.
1019 */
1020int dbg_check_space_info(struct ubifs_info *c)
1021{
1022 struct ubifs_debug_info *d = c->dbg;
1023 struct ubifs_lp_stats lst;
1024 long long free;
1025 int freeable_cnt;
1026
1027 spin_lock(&c->space_lock);
1028 freeable_cnt = c->freeable_cnt;
1029 c->freeable_cnt = 0;
1030 free = ubifs_get_free_space_nolock(c);
1031 c->freeable_cnt = freeable_cnt;
1032 spin_unlock(&c->space_lock);
1033
1034 if (free != d->saved_free) {
1035 ubifs_err(c, "free space changed from %lld to %lld",
1036 d->saved_free, free);
1037 goto out;
1038 }
1039
1040 return 0;
1041
1042out:
1043 ubifs_msg(c, "saved lprops statistics dump");
1044 ubifs_dump_lstats(&d->saved_lst);
1045 ubifs_msg(c, "saved budgeting info dump");
1046 ubifs_dump_budg(c, &d->saved_bi);
1047 ubifs_msg(c, "saved idx_gc_cnt %d", d->saved_idx_gc_cnt);
1048 ubifs_msg(c, "current lprops statistics dump");
1049 ubifs_get_lp_stats(c, &lst);
1050 ubifs_dump_lstats(&lst);
1051 ubifs_msg(c, "current budgeting info dump");
1052 ubifs_dump_budg(c, &c->bi);
1053 dump_stack();
1054 return -EINVAL;
1055}
1056
1057/**
1058 * dbg_check_synced_i_size - check synchronized inode size.
1059 * @c: UBIFS file-system description object
1060 * @inode: inode to check
1061 *
1062 * If inode is clean, synchronized inode size has to be equivalent to current
1063 * inode size. This function has to be called only for locked inodes (@i_mutex
1064 * has to be locked). Returns %0 if synchronized inode size if correct, and
1065 * %-EINVAL if not.
1066 */
1067int dbg_check_synced_i_size(const struct ubifs_info *c, struct inode *inode)
1068{
1069 int err = 0;
1070 struct ubifs_inode *ui = ubifs_inode(inode);
1071
1072 if (!dbg_is_chk_gen(c))
1073 return 0;
1074 if (!S_ISREG(inode->i_mode))
1075 return 0;
1076
1077 mutex_lock(&ui->ui_mutex);
1078 spin_lock(&ui->ui_lock);
1079 if (ui->ui_size != ui->synced_i_size && !ui->dirty) {
1080 ubifs_err(c, "ui_size is %lld, synced_i_size is %lld, but inode is clean",
1081 ui->ui_size, ui->synced_i_size);
1082 ubifs_err(c, "i_ino %lu, i_mode %#x, i_size %lld", inode->i_ino,
1083 inode->i_mode, i_size_read(inode));
1084 dump_stack();
1085 err = -EINVAL;
1086 }
1087 spin_unlock(&ui->ui_lock);
1088 mutex_unlock(&ui->ui_mutex);
1089 return err;
1090}
1091
1092/*
1093 * dbg_check_dir - check directory inode size and link count.
1094 * @c: UBIFS file-system description object
1095 * @dir: the directory to calculate size for
1096 * @size: the result is returned here
1097 *
1098 * This function makes sure that directory size and link count are correct.
1099 * Returns zero in case of success and a negative error code in case of
1100 * failure.
1101 *
1102 * Note, it is good idea to make sure the @dir->i_mutex is locked before
1103 * calling this function.
1104 */
1105int dbg_check_dir(struct ubifs_info *c, const struct inode *dir)
1106{
1107 unsigned int nlink = 2;
1108 union ubifs_key key;
1109 struct ubifs_dent_node *dent, *pdent = NULL;
1110 struct qstr nm = { .name = NULL };
1111 loff_t size = UBIFS_INO_NODE_SZ;
1112
1113 if (!dbg_is_chk_gen(c))
1114 return 0;
1115
1116 if (!S_ISDIR(dir->i_mode))
1117 return 0;
1118
1119 lowest_dent_key(c, &key, dir->i_ino);
1120 while (1) {
1121 int err;
1122
1123 dent = ubifs_tnc_next_ent(c, &key, &nm);
1124 if (IS_ERR(dent)) {
1125 err = PTR_ERR(dent);
1126 if (err == -ENOENT)
1127 break;
1128 return err;
1129 }
1130
1131 nm.name = dent->name;
1132 nm.len = le16_to_cpu(dent->nlen);
1133 size += CALC_DENT_SIZE(nm.len);
1134 if (dent->type == UBIFS_ITYPE_DIR)
1135 nlink += 1;
1136 kfree(pdent);
1137 pdent = dent;
1138 key_read(c, &dent->key, &key);
1139 }
1140 kfree(pdent);
1141
1142 if (i_size_read(dir) != size) {
1143 ubifs_err(c, "directory inode %lu has size %llu, but calculated size is %llu",
1144 dir->i_ino, (unsigned long long)i_size_read(dir),
1145 (unsigned long long)size);
1146 ubifs_dump_inode(c, dir);
1147 dump_stack();
1148 return -EINVAL;
1149 }
1150 if (dir->i_nlink != nlink) {
1151 ubifs_err(c, "directory inode %lu has nlink %u, but calculated nlink is %u",
1152 dir->i_ino, dir->i_nlink, nlink);
1153 ubifs_dump_inode(c, dir);
1154 dump_stack();
1155 return -EINVAL;
1156 }
1157
1158 return 0;
1159}
1160
1161/**
1162 * dbg_check_key_order - make sure that colliding keys are properly ordered.
1163 * @c: UBIFS file-system description object
1164 * @zbr1: first zbranch
1165 * @zbr2: following zbranch
1166 *
1167 * In UBIFS indexing B-tree colliding keys has to be sorted in binary order of
1168 * names of the direntries/xentries which are referred by the keys. This
1169 * function reads direntries/xentries referred by @zbr1 and @zbr2 and makes
1170 * sure the name of direntry/xentry referred by @zbr1 is less than
1171 * direntry/xentry referred by @zbr2. Returns zero if this is true, %1 if not,
1172 * and a negative error code in case of failure.
1173 */
1174static int dbg_check_key_order(struct ubifs_info *c, struct ubifs_zbranch *zbr1,
1175 struct ubifs_zbranch *zbr2)
1176{
1177 int err, nlen1, nlen2, cmp;
1178 struct ubifs_dent_node *dent1, *dent2;
1179 union ubifs_key key;
1180 char key_buf[DBG_KEY_BUF_LEN];
1181
1182 ubifs_assert(!keys_cmp(c, &zbr1->key, &zbr2->key));
1183 dent1 = kmalloc(UBIFS_MAX_DENT_NODE_SZ, GFP_NOFS);
1184 if (!dent1)
1185 return -ENOMEM;
1186 dent2 = kmalloc(UBIFS_MAX_DENT_NODE_SZ, GFP_NOFS);
1187 if (!dent2) {
1188 err = -ENOMEM;
1189 goto out_free;
1190 }
1191
1192 err = ubifs_tnc_read_node(c, zbr1, dent1);
1193 if (err)
1194 goto out_free;
1195 err = ubifs_validate_entry(c, dent1);
1196 if (err)
1197 goto out_free;
1198
1199 err = ubifs_tnc_read_node(c, zbr2, dent2);
1200 if (err)
1201 goto out_free;
1202 err = ubifs_validate_entry(c, dent2);
1203 if (err)
1204 goto out_free;
1205
1206 /* Make sure node keys are the same as in zbranch */
1207 err = 1;
1208 key_read(c, &dent1->key, &key);
1209 if (keys_cmp(c, &zbr1->key, &key)) {
1210 ubifs_err(c, "1st entry at %d:%d has key %s", zbr1->lnum,
1211 zbr1->offs, dbg_snprintf_key(c, &key, key_buf,
1212 DBG_KEY_BUF_LEN));
1213 ubifs_err(c, "but it should have key %s according to tnc",
1214 dbg_snprintf_key(c, &zbr1->key, key_buf,
1215 DBG_KEY_BUF_LEN));
1216 ubifs_dump_node(c, dent1);
1217 goto out_free;
1218 }
1219
1220 key_read(c, &dent2->key, &key);
1221 if (keys_cmp(c, &zbr2->key, &key)) {
1222 ubifs_err(c, "2nd entry at %d:%d has key %s", zbr1->lnum,
1223 zbr1->offs, dbg_snprintf_key(c, &key, key_buf,
1224 DBG_KEY_BUF_LEN));
1225 ubifs_err(c, "but it should have key %s according to tnc",
1226 dbg_snprintf_key(c, &zbr2->key, key_buf,
1227 DBG_KEY_BUF_LEN));
1228 ubifs_dump_node(c, dent2);
1229 goto out_free;
1230 }
1231
1232 nlen1 = le16_to_cpu(dent1->nlen);
1233 nlen2 = le16_to_cpu(dent2->nlen);
1234
1235 cmp = memcmp(dent1->name, dent2->name, min_t(int, nlen1, nlen2));
1236 if (cmp < 0 || (cmp == 0 && nlen1 < nlen2)) {
1237 err = 0;
1238 goto out_free;
1239 }
1240 if (cmp == 0 && nlen1 == nlen2)
1241 ubifs_err(c, "2 xent/dent nodes with the same name");
1242 else
1243 ubifs_err(c, "bad order of colliding key %s",
1244 dbg_snprintf_key(c, &key, key_buf, DBG_KEY_BUF_LEN));
1245
1246 ubifs_msg(c, "first node at %d:%d\n", zbr1->lnum, zbr1->offs);
1247 ubifs_dump_node(c, dent1);
1248 ubifs_msg(c, "second node at %d:%d\n", zbr2->lnum, zbr2->offs);
1249 ubifs_dump_node(c, dent2);
1250
1251out_free:
1252 kfree(dent2);
1253 kfree(dent1);
1254 return err;
1255}
1256
1257/**
1258 * dbg_check_znode - check if znode is all right.
1259 * @c: UBIFS file-system description object
1260 * @zbr: zbranch which points to this znode
1261 *
1262 * This function makes sure that znode referred to by @zbr is all right.
1263 * Returns zero if it is, and %-EINVAL if it is not.
1264 */
1265static int dbg_check_znode(struct ubifs_info *c, struct ubifs_zbranch *zbr)
1266{
1267 struct ubifs_znode *znode = zbr->znode;
1268 struct ubifs_znode *zp = znode->parent;
1269 int n, err, cmp;
1270
1271 if (znode->child_cnt <= 0 || znode->child_cnt > c->fanout) {
1272 err = 1;
1273 goto out;
1274 }
1275 if (znode->level < 0) {
1276 err = 2;
1277 goto out;
1278 }
1279 if (znode->iip < 0 || znode->iip >= c->fanout) {
1280 err = 3;
1281 goto out;
1282 }
1283
1284 if (zbr->len == 0)
1285 /* Only dirty zbranch may have no on-flash nodes */
1286 if (!ubifs_zn_dirty(znode)) {
1287 err = 4;
1288 goto out;
1289 }
1290
1291 if (ubifs_zn_dirty(znode)) {
1292 /*
1293 * If znode is dirty, its parent has to be dirty as well. The
1294 * order of the operation is important, so we have to have
1295 * memory barriers.
1296 */
1297 smp_mb();
1298 if (zp && !ubifs_zn_dirty(zp)) {
1299 /*
1300 * The dirty flag is atomic and is cleared outside the
1301 * TNC mutex, so znode's dirty flag may now have
1302 * been cleared. The child is always cleared before the
1303 * parent, so we just need to check again.
1304 */
1305 smp_mb();
1306 if (ubifs_zn_dirty(znode)) {
1307 err = 5;
1308 goto out;
1309 }
1310 }
1311 }
1312
1313 if (zp) {
1314 const union ubifs_key *min, *max;
1315
1316 if (znode->level != zp->level - 1) {
1317 err = 6;
1318 goto out;
1319 }
1320
1321 /* Make sure the 'parent' pointer in our znode is correct */
1322 err = ubifs_search_zbranch(c, zp, &zbr->key, &n);
1323 if (!err) {
1324 /* This zbranch does not exist in the parent */
1325 err = 7;
1326 goto out;
1327 }
1328
1329 if (znode->iip >= zp->child_cnt) {
1330 err = 8;
1331 goto out;
1332 }
1333
1334 if (znode->iip != n) {
1335 /* This may happen only in case of collisions */
1336 if (keys_cmp(c, &zp->zbranch[n].key,
1337 &zp->zbranch[znode->iip].key)) {
1338 err = 9;
1339 goto out;
1340 }
1341 n = znode->iip;
1342 }
1343
1344 /*
1345 * Make sure that the first key in our znode is greater than or
1346 * equal to the key in the pointing zbranch.
1347 */
1348 min = &zbr->key;
1349 cmp = keys_cmp(c, min, &znode->zbranch[0].key);
1350 if (cmp == 1) {
1351 err = 10;
1352 goto out;
1353 }
1354
1355 if (n + 1 < zp->child_cnt) {
1356 max = &zp->zbranch[n + 1].key;
1357
1358 /*
1359 * Make sure the last key in our znode is less or
1360 * equivalent than the key in the zbranch which goes
1361 * after our pointing zbranch.
1362 */
1363 cmp = keys_cmp(c, max,
1364 &znode->zbranch[znode->child_cnt - 1].key);
1365 if (cmp == -1) {
1366 err = 11;
1367 goto out;
1368 }
1369 }
1370 } else {
1371 /* This may only be root znode */
1372 if (zbr != &c->zroot) {
1373 err = 12;
1374 goto out;
1375 }
1376 }
1377
1378 /*
1379 * Make sure that next key is greater or equivalent then the previous
1380 * one.
1381 */
1382 for (n = 1; n < znode->child_cnt; n++) {
1383 cmp = keys_cmp(c, &znode->zbranch[n - 1].key,
1384 &znode->zbranch[n].key);
1385 if (cmp > 0) {
1386 err = 13;
1387 goto out;
1388 }
1389 if (cmp == 0) {
1390 /* This can only be keys with colliding hash */
1391 if (!is_hash_key(c, &znode->zbranch[n].key)) {
1392 err = 14;
1393 goto out;
1394 }
1395
1396 if (znode->level != 0 || c->replaying)
1397 continue;
1398
1399 /*
1400 * Colliding keys should follow binary order of
1401 * corresponding xentry/dentry names.
1402 */
1403 err = dbg_check_key_order(c, &znode->zbranch[n - 1],
1404 &znode->zbranch[n]);
1405 if (err < 0)
1406 return err;
1407 if (err) {
1408 err = 15;
1409 goto out;
1410 }
1411 }
1412 }
1413
1414 for (n = 0; n < znode->child_cnt; n++) {
1415 if (!znode->zbranch[n].znode &&
1416 (znode->zbranch[n].lnum == 0 ||
1417 znode->zbranch[n].len == 0)) {
1418 err = 16;
1419 goto out;
1420 }
1421
1422 if (znode->zbranch[n].lnum != 0 &&
1423 znode->zbranch[n].len == 0) {
1424 err = 17;
1425 goto out;
1426 }
1427
1428 if (znode->zbranch[n].lnum == 0 &&
1429 znode->zbranch[n].len != 0) {
1430 err = 18;
1431 goto out;
1432 }
1433
1434 if (znode->zbranch[n].lnum == 0 &&
1435 znode->zbranch[n].offs != 0) {
1436 err = 19;
1437 goto out;
1438 }
1439
1440 if (znode->level != 0 && znode->zbranch[n].znode)
1441 if (znode->zbranch[n].znode->parent != znode) {
1442 err = 20;
1443 goto out;
1444 }
1445 }
1446
1447 return 0;
1448
1449out:
1450 ubifs_err(c, "failed, error %d", err);
1451 ubifs_msg(c, "dump of the znode");
1452 ubifs_dump_znode(c, znode);
1453 if (zp) {
1454 ubifs_msg(c, "dump of the parent znode");
1455 ubifs_dump_znode(c, zp);
1456 }
1457 dump_stack();
1458 return -EINVAL;
1459}
1460
1461/**
1462 * dbg_check_tnc - check TNC tree.
1463 * @c: UBIFS file-system description object
1464 * @extra: do extra checks that are possible at start commit
1465 *
1466 * This function traverses whole TNC tree and checks every znode. Returns zero
1467 * if everything is all right and %-EINVAL if something is wrong with TNC.
1468 */
1469int dbg_check_tnc(struct ubifs_info *c, int extra)
1470{
1471 struct ubifs_znode *znode;
1472 long clean_cnt = 0, dirty_cnt = 0;
1473 int err, last;
1474
1475 if (!dbg_is_chk_index(c))
1476 return 0;
1477
1478 ubifs_assert(mutex_is_locked(&c->tnc_mutex));
1479 if (!c->zroot.znode)
1480 return 0;
1481
1482 znode = ubifs_tnc_postorder_first(c->zroot.znode);
1483 while (1) {
1484 struct ubifs_znode *prev;
1485 struct ubifs_zbranch *zbr;
1486
1487 if (!znode->parent)
1488 zbr = &c->zroot;
1489 else
1490 zbr = &znode->parent->zbranch[znode->iip];
1491
1492 err = dbg_check_znode(c, zbr);
1493 if (err)
1494 return err;
1495
1496 if (extra) {
1497 if (ubifs_zn_dirty(znode))
1498 dirty_cnt += 1;
1499 else
1500 clean_cnt += 1;
1501 }
1502
1503 prev = znode;
1504 znode = ubifs_tnc_postorder_next(znode);
1505 if (!znode)
1506 break;
1507
1508 /*
1509 * If the last key of this znode is equivalent to the first key
1510 * of the next znode (collision), then check order of the keys.
1511 */
1512 last = prev->child_cnt - 1;
1513 if (prev->level == 0 && znode->level == 0 && !c->replaying &&
1514 !keys_cmp(c, &prev->zbranch[last].key,
1515 &znode->zbranch[0].key)) {
1516 err = dbg_check_key_order(c, &prev->zbranch[last],
1517 &znode->zbranch[0]);
1518 if (err < 0)
1519 return err;
1520 if (err) {
1521 ubifs_msg(c, "first znode");
1522 ubifs_dump_znode(c, prev);
1523 ubifs_msg(c, "second znode");
1524 ubifs_dump_znode(c, znode);
1525 return -EINVAL;
1526 }
1527 }
1528 }
1529
1530 if (extra) {
1531 if (clean_cnt != atomic_long_read(&c->clean_zn_cnt)) {
1532 ubifs_err(c, "incorrect clean_zn_cnt %ld, calculated %ld",
1533 atomic_long_read(&c->clean_zn_cnt),
1534 clean_cnt);
1535 return -EINVAL;
1536 }
1537 if (dirty_cnt != atomic_long_read(&c->dirty_zn_cnt)) {
1538 ubifs_err(c, "incorrect dirty_zn_cnt %ld, calculated %ld",
1539 atomic_long_read(&c->dirty_zn_cnt),
1540 dirty_cnt);
1541 return -EINVAL;
1542 }
1543 }
1544
1545 return 0;
1546}
1547
1548/**
1549 * dbg_walk_index - walk the on-flash index.
1550 * @c: UBIFS file-system description object
1551 * @leaf_cb: called for each leaf node
1552 * @znode_cb: called for each indexing node
1553 * @priv: private data which is passed to callbacks
1554 *
1555 * This function walks the UBIFS index and calls the @leaf_cb for each leaf
1556 * node and @znode_cb for each indexing node. Returns zero in case of success
1557 * and a negative error code in case of failure.
1558 *
1559 * It would be better if this function removed every znode it pulled to into
1560 * the TNC, so that the behavior more closely matched the non-debugging
1561 * behavior.
1562 */
1563int dbg_walk_index(struct ubifs_info *c, dbg_leaf_callback leaf_cb,
1564 dbg_znode_callback znode_cb, void *priv)
1565{
1566 int err;
1567 struct ubifs_zbranch *zbr;
1568 struct ubifs_znode *znode, *child;
1569
1570 mutex_lock(&c->tnc_mutex);
1571 /* If the root indexing node is not in TNC - pull it */
1572 if (!c->zroot.znode) {
1573 c->zroot.znode = ubifs_load_znode(c, &c->zroot, NULL, 0);
1574 if (IS_ERR(c->zroot.znode)) {
1575 err = PTR_ERR(c->zroot.znode);
1576 c->zroot.znode = NULL;
1577 goto out_unlock;
1578 }
1579 }
1580
1581 /*
1582 * We are going to traverse the indexing tree in the postorder manner.
1583 * Go down and find the leftmost indexing node where we are going to
1584 * start from.
1585 */
1586 znode = c->zroot.znode;
1587 while (znode->level > 0) {
1588 zbr = &znode->zbranch[0];
1589 child = zbr->znode;
1590 if (!child) {
1591 child = ubifs_load_znode(c, zbr, znode, 0);
1592 if (IS_ERR(child)) {
1593 err = PTR_ERR(child);
1594 goto out_unlock;
1595 }
1596 zbr->znode = child;
1597 }
1598
1599 znode = child;
1600 }
1601
1602 /* Iterate over all indexing nodes */
1603 while (1) {
1604 int idx;
1605
1606 cond_resched();
1607
1608 if (znode_cb) {
1609 err = znode_cb(c, znode, priv);
1610 if (err) {
1611 ubifs_err(c, "znode checking function returned error %d",
1612 err);
1613 ubifs_dump_znode(c, znode);
1614 goto out_dump;
1615 }
1616 }
1617 if (leaf_cb && znode->level == 0) {
1618 for (idx = 0; idx < znode->child_cnt; idx++) {
1619 zbr = &znode->zbranch[idx];
1620 err = leaf_cb(c, zbr, priv);
1621 if (err) {
1622 ubifs_err(c, "leaf checking function returned error %d, for leaf at LEB %d:%d",
1623 err, zbr->lnum, zbr->offs);
1624 goto out_dump;
1625 }
1626 }
1627 }
1628
1629 if (!znode->parent)
1630 break;
1631
1632 idx = znode->iip + 1;
1633 znode = znode->parent;
1634 if (idx < znode->child_cnt) {
1635 /* Switch to the next index in the parent */
1636 zbr = &znode->zbranch[idx];
1637 child = zbr->znode;
1638 if (!child) {
1639 child = ubifs_load_znode(c, zbr, znode, idx);
1640 if (IS_ERR(child)) {
1641 err = PTR_ERR(child);
1642 goto out_unlock;
1643 }
1644 zbr->znode = child;
1645 }
1646 znode = child;
1647 } else
1648 /*
1649 * This is the last child, switch to the parent and
1650 * continue.
1651 */
1652 continue;
1653
1654 /* Go to the lowest leftmost znode in the new sub-tree */
1655 while (znode->level > 0) {
1656 zbr = &znode->zbranch[0];
1657 child = zbr->znode;
1658 if (!child) {
1659 child = ubifs_load_znode(c, zbr, znode, 0);
1660 if (IS_ERR(child)) {
1661 err = PTR_ERR(child);
1662 goto out_unlock;
1663 }
1664 zbr->znode = child;
1665 }
1666 znode = child;
1667 }
1668 }
1669
1670 mutex_unlock(&c->tnc_mutex);
1671 return 0;
1672
1673out_dump:
1674 if (znode->parent)
1675 zbr = &znode->parent->zbranch[znode->iip];
1676 else
1677 zbr = &c->zroot;
1678 ubifs_msg(c, "dump of znode at LEB %d:%d", zbr->lnum, zbr->offs);
1679 ubifs_dump_znode(c, znode);
1680out_unlock:
1681 mutex_unlock(&c->tnc_mutex);
1682 return err;
1683}
1684
1685/**
1686 * add_size - add znode size to partially calculated index size.
1687 * @c: UBIFS file-system description object
1688 * @znode: znode to add size for
1689 * @priv: partially calculated index size
1690 *
1691 * This is a helper function for 'dbg_check_idx_size()' which is called for
1692 * every indexing node and adds its size to the 'long long' variable pointed to
1693 * by @priv.
1694 */
1695static int add_size(struct ubifs_info *c, struct ubifs_znode *znode, void *priv)
1696{
1697 long long *idx_size = priv;
1698 int add;
1699
1700 add = ubifs_idx_node_sz(c, znode->child_cnt);
1701 add = ALIGN(add, 8);
1702 *idx_size += add;
1703 return 0;
1704}
1705
1706/**
1707 * dbg_check_idx_size - check index size.
1708 * @c: UBIFS file-system description object
1709 * @idx_size: size to check
1710 *
1711 * This function walks the UBIFS index, calculates its size and checks that the
1712 * size is equivalent to @idx_size. Returns zero in case of success and a
1713 * negative error code in case of failure.
1714 */
1715int dbg_check_idx_size(struct ubifs_info *c, long long idx_size)
1716{
1717 int err;
1718 long long calc = 0;
1719
1720 if (!dbg_is_chk_index(c))
1721 return 0;
1722
1723 err = dbg_walk_index(c, NULL, add_size, &calc);
1724 if (err) {
1725 ubifs_err(c, "error %d while walking the index", err);
1726 return err;
1727 }
1728
1729 if (calc != idx_size) {
1730 ubifs_err(c, "index size check failed: calculated size is %lld, should be %lld",
1731 calc, idx_size);
1732 dump_stack();
1733 return -EINVAL;
1734 }
1735
1736 return 0;
1737}
1738
1739/**
1740 * struct fsck_inode - information about an inode used when checking the file-system.
1741 * @rb: link in the RB-tree of inodes
1742 * @inum: inode number
1743 * @mode: inode type, permissions, etc
1744 * @nlink: inode link count
1745 * @xattr_cnt: count of extended attributes
1746 * @references: how many directory/xattr entries refer this inode (calculated
1747 * while walking the index)
1748 * @calc_cnt: for directory inode count of child directories
1749 * @size: inode size (read from on-flash inode)
1750 * @xattr_sz: summary size of all extended attributes (read from on-flash
1751 * inode)
1752 * @calc_sz: for directories calculated directory size
1753 * @calc_xcnt: count of extended attributes
1754 * @calc_xsz: calculated summary size of all extended attributes
1755 * @xattr_nms: sum of lengths of all extended attribute names belonging to this
1756 * inode (read from on-flash inode)
1757 * @calc_xnms: calculated sum of lengths of all extended attribute names
1758 */
1759struct fsck_inode {
1760 struct rb_node rb;
1761 ino_t inum;
1762 umode_t mode;
1763 unsigned int nlink;
1764 unsigned int xattr_cnt;
1765 int references;
1766 int calc_cnt;
1767 long long size;
1768 unsigned int xattr_sz;
1769 long long calc_sz;
1770 long long calc_xcnt;
1771 long long calc_xsz;
1772 unsigned int xattr_nms;
1773 long long calc_xnms;
1774};
1775
1776/**
1777 * struct fsck_data - private FS checking information.
1778 * @inodes: RB-tree of all inodes (contains @struct fsck_inode objects)
1779 */
1780struct fsck_data {
1781 struct rb_root inodes;
1782};
1783
1784/**
1785 * add_inode - add inode information to RB-tree of inodes.
1786 * @c: UBIFS file-system description object
1787 * @fsckd: FS checking information
1788 * @ino: raw UBIFS inode to add
1789 *
1790 * This is a helper function for 'check_leaf()' which adds information about
1791 * inode @ino to the RB-tree of inodes. Returns inode information pointer in
1792 * case of success and a negative error code in case of failure.
1793 */
1794static struct fsck_inode *add_inode(struct ubifs_info *c,
1795 struct fsck_data *fsckd,
1796 struct ubifs_ino_node *ino)
1797{
1798 struct rb_node **p, *parent = NULL;
1799 struct fsck_inode *fscki;
1800 ino_t inum = key_inum_flash(c, &ino->key);
1801 struct inode *inode;
1802 struct ubifs_inode *ui;
1803
1804 p = &fsckd->inodes.rb_node;
1805 while (*p) {
1806 parent = *p;
1807 fscki = rb_entry(parent, struct fsck_inode, rb);
1808 if (inum < fscki->inum)
1809 p = &(*p)->rb_left;
1810 else if (inum > fscki->inum)
1811 p = &(*p)->rb_right;
1812 else
1813 return fscki;
1814 }
1815
1816 if (inum > c->highest_inum) {
1817 ubifs_err(c, "too high inode number, max. is %lu",
1818 (unsigned long)c->highest_inum);
1819 return ERR_PTR(-EINVAL);
1820 }
1821
1822 fscki = kzalloc(sizeof(struct fsck_inode), GFP_NOFS);
1823 if (!fscki)
1824 return ERR_PTR(-ENOMEM);
1825
1826 inode = ilookup(c->vfs_sb, inum);
1827
1828 fscki->inum = inum;
1829 /*
1830 * If the inode is present in the VFS inode cache, use it instead of
1831 * the on-flash inode which might be out-of-date. E.g., the size might
1832 * be out-of-date. If we do not do this, the following may happen, for
1833 * example:
1834 * 1. A power cut happens
1835 * 2. We mount the file-system R/O, the replay process fixes up the
1836 * inode size in the VFS cache, but on on-flash.
1837 * 3. 'check_leaf()' fails because it hits a data node beyond inode
1838 * size.
1839 */
1840 if (!inode) {
1841 fscki->nlink = le32_to_cpu(ino->nlink);
1842 fscki->size = le64_to_cpu(ino->size);
1843 fscki->xattr_cnt = le32_to_cpu(ino->xattr_cnt);
1844 fscki->xattr_sz = le32_to_cpu(ino->xattr_size);
1845 fscki->xattr_nms = le32_to_cpu(ino->xattr_names);
1846 fscki->mode = le32_to_cpu(ino->mode);
1847 } else {
1848 ui = ubifs_inode(inode);
1849 fscki->nlink = inode->i_nlink;
1850 fscki->size = inode->i_size;
1851 fscki->xattr_cnt = ui->xattr_cnt;
1852 fscki->xattr_sz = ui->xattr_size;
1853 fscki->xattr_nms = ui->xattr_names;
1854 fscki->mode = inode->i_mode;
1855 iput(inode);
1856 }
1857
1858 if (S_ISDIR(fscki->mode)) {
1859 fscki->calc_sz = UBIFS_INO_NODE_SZ;
1860 fscki->calc_cnt = 2;
1861 }
1862
1863 rb_link_node(&fscki->rb, parent, p);
1864 rb_insert_color(&fscki->rb, &fsckd->inodes);
1865
1866 return fscki;
1867}
1868
1869/**
1870 * search_inode - search inode in the RB-tree of inodes.
1871 * @fsckd: FS checking information
1872 * @inum: inode number to search
1873 *
1874 * This is a helper function for 'check_leaf()' which searches inode @inum in
1875 * the RB-tree of inodes and returns an inode information pointer or %NULL if
1876 * the inode was not found.
1877 */
1878static struct fsck_inode *search_inode(struct fsck_data *fsckd, ino_t inum)
1879{
1880 struct rb_node *p;
1881 struct fsck_inode *fscki;
1882
1883 p = fsckd->inodes.rb_node;
1884 while (p) {
1885 fscki = rb_entry(p, struct fsck_inode, rb);
1886 if (inum < fscki->inum)
1887 p = p->rb_left;
1888 else if (inum > fscki->inum)
1889 p = p->rb_right;
1890 else
1891 return fscki;
1892 }
1893 return NULL;
1894}
1895
1896/**
1897 * read_add_inode - read inode node and add it to RB-tree of inodes.
1898 * @c: UBIFS file-system description object
1899 * @fsckd: FS checking information
1900 * @inum: inode number to read
1901 *
1902 * This is a helper function for 'check_leaf()' which finds inode node @inum in
1903 * the index, reads it, and adds it to the RB-tree of inodes. Returns inode
1904 * information pointer in case of success and a negative error code in case of
1905 * failure.
1906 */
1907static struct fsck_inode *read_add_inode(struct ubifs_info *c,
1908 struct fsck_data *fsckd, ino_t inum)
1909{
1910 int n, err;
1911 union ubifs_key key;
1912 struct ubifs_znode *znode;
1913 struct ubifs_zbranch *zbr;
1914 struct ubifs_ino_node *ino;
1915 struct fsck_inode *fscki;
1916
1917 fscki = search_inode(fsckd, inum);
1918 if (fscki)
1919 return fscki;
1920
1921 ino_key_init(c, &key, inum);
1922 err = ubifs_lookup_level0(c, &key, &znode, &n);
1923 if (!err) {
1924 ubifs_err(c, "inode %lu not found in index", (unsigned long)inum);
1925 return ERR_PTR(-ENOENT);
1926 } else if (err < 0) {
1927 ubifs_err(c, "error %d while looking up inode %lu",
1928 err, (unsigned long)inum);
1929 return ERR_PTR(err);
1930 }
1931
1932 zbr = &znode->zbranch[n];
1933 if (zbr->len < UBIFS_INO_NODE_SZ) {
1934 ubifs_err(c, "bad node %lu node length %d",
1935 (unsigned long)inum, zbr->len);
1936 return ERR_PTR(-EINVAL);
1937 }
1938
1939 ino = kmalloc(zbr->len, GFP_NOFS);
1940 if (!ino)
1941 return ERR_PTR(-ENOMEM);
1942
1943 err = ubifs_tnc_read_node(c, zbr, ino);
1944 if (err) {
1945 ubifs_err(c, "cannot read inode node at LEB %d:%d, error %d",
1946 zbr->lnum, zbr->offs, err);
1947 kfree(ino);
1948 return ERR_PTR(err);
1949 }
1950
1951 fscki = add_inode(c, fsckd, ino);
1952 kfree(ino);
1953 if (IS_ERR(fscki)) {
1954 ubifs_err(c, "error %ld while adding inode %lu node",
1955 PTR_ERR(fscki), (unsigned long)inum);
1956 return fscki;
1957 }
1958
1959 return fscki;
1960}
1961
1962/**
1963 * check_leaf - check leaf node.
1964 * @c: UBIFS file-system description object
1965 * @zbr: zbranch of the leaf node to check
1966 * @priv: FS checking information
1967 *
1968 * This is a helper function for 'dbg_check_filesystem()' which is called for
1969 * every single leaf node while walking the indexing tree. It checks that the
1970 * leaf node referred from the indexing tree exists, has correct CRC, and does
1971 * some other basic validation. This function is also responsible for building
1972 * an RB-tree of inodes - it adds all inodes into the RB-tree. It also
1973 * calculates reference count, size, etc for each inode in order to later
1974 * compare them to the information stored inside the inodes and detect possible
1975 * inconsistencies. Returns zero in case of success and a negative error code
1976 * in case of failure.
1977 */
1978static int check_leaf(struct ubifs_info *c, struct ubifs_zbranch *zbr,
1979 void *priv)
1980{
1981 ino_t inum;
1982 void *node;
1983 struct ubifs_ch *ch;
1984 int err, type = key_type(c, &zbr->key);
1985 struct fsck_inode *fscki;
1986
1987 if (zbr->len < UBIFS_CH_SZ) {
1988 ubifs_err(c, "bad leaf length %d (LEB %d:%d)",
1989 zbr->len, zbr->lnum, zbr->offs);
1990 return -EINVAL;
1991 }
1992
1993 node = kmalloc(zbr->len, GFP_NOFS);
1994 if (!node)
1995 return -ENOMEM;
1996
1997 err = ubifs_tnc_read_node(c, zbr, node);
1998 if (err) {
1999 ubifs_err(c, "cannot read leaf node at LEB %d:%d, error %d",
2000 zbr->lnum, zbr->offs, err);
2001 goto out_free;
2002 }
2003
2004 /* If this is an inode node, add it to RB-tree of inodes */
2005 if (type == UBIFS_INO_KEY) {
2006 fscki = add_inode(c, priv, node);
2007 if (IS_ERR(fscki)) {
2008 err = PTR_ERR(fscki);
2009 ubifs_err(c, "error %d while adding inode node", err);
2010 goto out_dump;
2011 }
2012 goto out;
2013 }
2014
2015 if (type != UBIFS_DENT_KEY && type != UBIFS_XENT_KEY &&
2016 type != UBIFS_DATA_KEY) {
2017 ubifs_err(c, "unexpected node type %d at LEB %d:%d",
2018 type, zbr->lnum, zbr->offs);
2019 err = -EINVAL;
2020 goto out_free;
2021 }
2022
2023 ch = node;
2024 if (le64_to_cpu(ch->sqnum) > c->max_sqnum) {
2025 ubifs_err(c, "too high sequence number, max. is %llu",
2026 c->max_sqnum);
2027 err = -EINVAL;
2028 goto out_dump;
2029 }
2030
2031 if (type == UBIFS_DATA_KEY) {
2032 long long blk_offs;
2033 struct ubifs_data_node *dn = node;
2034
2035 ubifs_assert(zbr->len >= UBIFS_DATA_NODE_SZ);
2036
2037 /*
2038 * Search the inode node this data node belongs to and insert
2039 * it to the RB-tree of inodes.
2040 */
2041 inum = key_inum_flash(c, &dn->key);
2042 fscki = read_add_inode(c, priv, inum);
2043 if (IS_ERR(fscki)) {
2044 err = PTR_ERR(fscki);
2045 ubifs_err(c, "error %d while processing data node and trying to find inode node %lu",
2046 err, (unsigned long)inum);
2047 goto out_dump;
2048 }
2049
2050 /* Make sure the data node is within inode size */
2051 blk_offs = key_block_flash(c, &dn->key);
2052 blk_offs <<= UBIFS_BLOCK_SHIFT;
2053 blk_offs += le32_to_cpu(dn->size);
2054 if (blk_offs > fscki->size) {
2055 ubifs_err(c, "data node at LEB %d:%d is not within inode size %lld",
2056 zbr->lnum, zbr->offs, fscki->size);
2057 err = -EINVAL;
2058 goto out_dump;
2059 }
2060 } else {
2061 int nlen;
2062 struct ubifs_dent_node *dent = node;
2063 struct fsck_inode *fscki1;
2064
2065 ubifs_assert(zbr->len >= UBIFS_DENT_NODE_SZ);
2066
2067 err = ubifs_validate_entry(c, dent);
2068 if (err)
2069 goto out_dump;
2070
2071 /*
2072 * Search the inode node this entry refers to and the parent
2073 * inode node and insert them to the RB-tree of inodes.
2074 */
2075 inum = le64_to_cpu(dent->inum);
2076 fscki = read_add_inode(c, priv, inum);
2077 if (IS_ERR(fscki)) {
2078 err = PTR_ERR(fscki);
2079 ubifs_err(c, "error %d while processing entry node and trying to find inode node %lu",
2080 err, (unsigned long)inum);
2081 goto out_dump;
2082 }
2083
2084 /* Count how many direntries or xentries refers this inode */
2085 fscki->references += 1;
2086
2087 inum = key_inum_flash(c, &dent->key);
2088 fscki1 = read_add_inode(c, priv, inum);
2089 if (IS_ERR(fscki1)) {
2090 err = PTR_ERR(fscki1);
2091 ubifs_err(c, "error %d while processing entry node and trying to find parent inode node %lu",
2092 err, (unsigned long)inum);
2093 goto out_dump;
2094 }
2095
2096 nlen = le16_to_cpu(dent->nlen);
2097 if (type == UBIFS_XENT_KEY) {
2098 fscki1->calc_xcnt += 1;
2099 fscki1->calc_xsz += CALC_DENT_SIZE(nlen);
2100 fscki1->calc_xsz += CALC_XATTR_BYTES(fscki->size);
2101 fscki1->calc_xnms += nlen;
2102 } else {
2103 fscki1->calc_sz += CALC_DENT_SIZE(nlen);
2104 if (dent->type == UBIFS_ITYPE_DIR)
2105 fscki1->calc_cnt += 1;
2106 }
2107 }
2108
2109out:
2110 kfree(node);
2111 return 0;
2112
2113out_dump:
2114 ubifs_msg(c, "dump of node at LEB %d:%d", zbr->lnum, zbr->offs);
2115 ubifs_dump_node(c, node);
2116out_free:
2117 kfree(node);
2118 return err;
2119}
2120
2121/**
2122 * free_inodes - free RB-tree of inodes.
2123 * @fsckd: FS checking information
2124 */
2125static void free_inodes(struct fsck_data *fsckd)
2126{
2127 struct fsck_inode *fscki, *n;
2128
2129 rbtree_postorder_for_each_entry_safe(fscki, n, &fsckd->inodes, rb)
2130 kfree(fscki);
2131}
2132
2133/**
2134 * check_inodes - checks all inodes.
2135 * @c: UBIFS file-system description object
2136 * @fsckd: FS checking information
2137 *
2138 * This is a helper function for 'dbg_check_filesystem()' which walks the
2139 * RB-tree of inodes after the index scan has been finished, and checks that
2140 * inode nlink, size, etc are correct. Returns zero if inodes are fine,
2141 * %-EINVAL if not, and a negative error code in case of failure.
2142 */
2143static int check_inodes(struct ubifs_info *c, struct fsck_data *fsckd)
2144{
2145 int n, err;
2146 union ubifs_key key;
2147 struct ubifs_znode *znode;
2148 struct ubifs_zbranch *zbr;
2149 struct ubifs_ino_node *ino;
2150 struct fsck_inode *fscki;
2151 struct rb_node *this = rb_first(&fsckd->inodes);
2152
2153 while (this) {
2154 fscki = rb_entry(this, struct fsck_inode, rb);
2155 this = rb_next(this);
2156
2157 if (S_ISDIR(fscki->mode)) {
2158 /*
2159 * Directories have to have exactly one reference (they
2160 * cannot have hardlinks), although root inode is an
2161 * exception.
2162 */
2163 if (fscki->inum != UBIFS_ROOT_INO &&
2164 fscki->references != 1) {
2165 ubifs_err(c, "directory inode %lu has %d direntries which refer it, but should be 1",
2166 (unsigned long)fscki->inum,
2167 fscki->references);
2168 goto out_dump;
2169 }
2170 if (fscki->inum == UBIFS_ROOT_INO &&
2171 fscki->references != 0) {
2172 ubifs_err(c, "root inode %lu has non-zero (%d) direntries which refer it",
2173 (unsigned long)fscki->inum,
2174 fscki->references);
2175 goto out_dump;
2176 }
2177 if (fscki->calc_sz != fscki->size) {
2178 ubifs_err(c, "directory inode %lu size is %lld, but calculated size is %lld",
2179 (unsigned long)fscki->inum,
2180 fscki->size, fscki->calc_sz);
2181 goto out_dump;
2182 }
2183 if (fscki->calc_cnt != fscki->nlink) {
2184 ubifs_err(c, "directory inode %lu nlink is %d, but calculated nlink is %d",
2185 (unsigned long)fscki->inum,
2186 fscki->nlink, fscki->calc_cnt);
2187 goto out_dump;
2188 }
2189 } else {
2190 if (fscki->references != fscki->nlink) {
2191 ubifs_err(c, "inode %lu nlink is %d, but calculated nlink is %d",
2192 (unsigned long)fscki->inum,
2193 fscki->nlink, fscki->references);
2194 goto out_dump;
2195 }
2196 }
2197 if (fscki->xattr_sz != fscki->calc_xsz) {
2198 ubifs_err(c, "inode %lu has xattr size %u, but calculated size is %lld",
2199 (unsigned long)fscki->inum, fscki->xattr_sz,
2200 fscki->calc_xsz);
2201 goto out_dump;
2202 }
2203 if (fscki->xattr_cnt != fscki->calc_xcnt) {
2204 ubifs_err(c, "inode %lu has %u xattrs, but calculated count is %lld",
2205 (unsigned long)fscki->inum,
2206 fscki->xattr_cnt, fscki->calc_xcnt);
2207 goto out_dump;
2208 }
2209 if (fscki->xattr_nms != fscki->calc_xnms) {
2210 ubifs_err(c, "inode %lu has xattr names' size %u, but calculated names' size is %lld",
2211 (unsigned long)fscki->inum, fscki->xattr_nms,
2212 fscki->calc_xnms);
2213 goto out_dump;
2214 }
2215 }
2216
2217 return 0;
2218
2219out_dump:
2220 /* Read the bad inode and dump it */
2221 ino_key_init(c, &key, fscki->inum);
2222 err = ubifs_lookup_level0(c, &key, &znode, &n);
2223 if (!err) {
2224 ubifs_err(c, "inode %lu not found in index",
2225 (unsigned long)fscki->inum);
2226 return -ENOENT;
2227 } else if (err < 0) {
2228 ubifs_err(c, "error %d while looking up inode %lu",
2229 err, (unsigned long)fscki->inum);
2230 return err;
2231 }
2232
2233 zbr = &znode->zbranch[n];
2234 ino = kmalloc(zbr->len, GFP_NOFS);
2235 if (!ino)
2236 return -ENOMEM;
2237
2238 err = ubifs_tnc_read_node(c, zbr, ino);
2239 if (err) {
2240 ubifs_err(c, "cannot read inode node at LEB %d:%d, error %d",
2241 zbr->lnum, zbr->offs, err);
2242 kfree(ino);
2243 return err;
2244 }
2245
2246 ubifs_msg(c, "dump of the inode %lu sitting in LEB %d:%d",
2247 (unsigned long)fscki->inum, zbr->lnum, zbr->offs);
2248 ubifs_dump_node(c, ino);
2249 kfree(ino);
2250 return -EINVAL;
2251}
2252
2253/**
2254 * dbg_check_filesystem - check the file-system.
2255 * @c: UBIFS file-system description object
2256 *
2257 * This function checks the file system, namely:
2258 * o makes sure that all leaf nodes exist and their CRCs are correct;
2259 * o makes sure inode nlink, size, xattr size/count are correct (for all
2260 * inodes).
2261 *
2262 * The function reads whole indexing tree and all nodes, so it is pretty
2263 * heavy-weight. Returns zero if the file-system is consistent, %-EINVAL if
2264 * not, and a negative error code in case of failure.
2265 */
2266int dbg_check_filesystem(struct ubifs_info *c)
2267{
2268 int err;
2269 struct fsck_data fsckd;
2270
2271 if (!dbg_is_chk_fs(c))
2272 return 0;
2273
2274 fsckd.inodes = RB_ROOT;
2275 err = dbg_walk_index(c, check_leaf, NULL, &fsckd);
2276 if (err)
2277 goto out_free;
2278
2279 err = check_inodes(c, &fsckd);
2280 if (err)
2281 goto out_free;
2282
2283 free_inodes(&fsckd);
2284 return 0;
2285
2286out_free:
2287 ubifs_err(c, "file-system check failed with error %d", err);
2288 dump_stack();
2289 free_inodes(&fsckd);
2290 return err;
2291}
2292
2293/**
2294 * dbg_check_data_nodes_order - check that list of data nodes is sorted.
2295 * @c: UBIFS file-system description object
2296 * @head: the list of nodes ('struct ubifs_scan_node' objects)
2297 *
2298 * This function returns zero if the list of data nodes is sorted correctly,
2299 * and %-EINVAL if not.
2300 */
2301int dbg_check_data_nodes_order(struct ubifs_info *c, struct list_head *head)
2302{
2303 struct list_head *cur;
2304 struct ubifs_scan_node *sa, *sb;
2305
2306 if (!dbg_is_chk_gen(c))
2307 return 0;
2308
2309 for (cur = head->next; cur->next != head; cur = cur->next) {
2310 ino_t inuma, inumb;
2311 uint32_t blka, blkb;
2312
2313 cond_resched();
2314 sa = container_of(cur, struct ubifs_scan_node, list);
2315 sb = container_of(cur->next, struct ubifs_scan_node, list);
2316
2317 if (sa->type != UBIFS_DATA_NODE) {
2318 ubifs_err(c, "bad node type %d", sa->type);
2319 ubifs_dump_node(c, sa->node);
2320 return -EINVAL;
2321 }
2322 if (sb->type != UBIFS_DATA_NODE) {
2323 ubifs_err(c, "bad node type %d", sb->type);
2324 ubifs_dump_node(c, sb->node);
2325 return -EINVAL;
2326 }
2327
2328 inuma = key_inum(c, &sa->key);
2329 inumb = key_inum(c, &sb->key);
2330
2331 if (inuma < inumb)
2332 continue;
2333 if (inuma > inumb) {
2334 ubifs_err(c, "larger inum %lu goes before inum %lu",
2335 (unsigned long)inuma, (unsigned long)inumb);
2336 goto error_dump;
2337 }
2338
2339 blka = key_block(c, &sa->key);
2340 blkb = key_block(c, &sb->key);
2341
2342 if (blka > blkb) {
2343 ubifs_err(c, "larger block %u goes before %u", blka, blkb);
2344 goto error_dump;
2345 }
2346 if (blka == blkb) {
2347 ubifs_err(c, "two data nodes for the same block");
2348 goto error_dump;
2349 }
2350 }
2351
2352 return 0;
2353
2354error_dump:
2355 ubifs_dump_node(c, sa->node);
2356 ubifs_dump_node(c, sb->node);
2357 return -EINVAL;
2358}
2359
2360/**
2361 * dbg_check_nondata_nodes_order - check that list of data nodes is sorted.
2362 * @c: UBIFS file-system description object
2363 * @head: the list of nodes ('struct ubifs_scan_node' objects)
2364 *
2365 * This function returns zero if the list of non-data nodes is sorted correctly,
2366 * and %-EINVAL if not.
2367 */
2368int dbg_check_nondata_nodes_order(struct ubifs_info *c, struct list_head *head)
2369{
2370 struct list_head *cur;
2371 struct ubifs_scan_node *sa, *sb;
2372
2373 if (!dbg_is_chk_gen(c))
2374 return 0;
2375
2376 for (cur = head->next; cur->next != head; cur = cur->next) {
2377 ino_t inuma, inumb;
2378 uint32_t hasha, hashb;
2379
2380 cond_resched();
2381 sa = container_of(cur, struct ubifs_scan_node, list);
2382 sb = container_of(cur->next, struct ubifs_scan_node, list);
2383
2384 if (sa->type != UBIFS_INO_NODE && sa->type != UBIFS_DENT_NODE &&
2385 sa->type != UBIFS_XENT_NODE) {
2386 ubifs_err(c, "bad node type %d", sa->type);
2387 ubifs_dump_node(c, sa->node);
2388 return -EINVAL;
2389 }
2390 if (sa->type != UBIFS_INO_NODE && sa->type != UBIFS_DENT_NODE &&
2391 sa->type != UBIFS_XENT_NODE) {
2392 ubifs_err(c, "bad node type %d", sb->type);
2393 ubifs_dump_node(c, sb->node);
2394 return -EINVAL;
2395 }
2396
2397 if (sa->type != UBIFS_INO_NODE && sb->type == UBIFS_INO_NODE) {
2398 ubifs_err(c, "non-inode node goes before inode node");
2399 goto error_dump;
2400 }
2401
2402 if (sa->type == UBIFS_INO_NODE && sb->type != UBIFS_INO_NODE)
2403 continue;
2404
2405 if (sa->type == UBIFS_INO_NODE && sb->type == UBIFS_INO_NODE) {
2406 /* Inode nodes are sorted in descending size order */
2407 if (sa->len < sb->len) {
2408 ubifs_err(c, "smaller inode node goes first");
2409 goto error_dump;
2410 }
2411 continue;
2412 }
2413
2414 /*
2415 * This is either a dentry or xentry, which should be sorted in
2416 * ascending (parent ino, hash) order.
2417 */
2418 inuma = key_inum(c, &sa->key);
2419 inumb = key_inum(c, &sb->key);
2420
2421 if (inuma < inumb)
2422 continue;
2423 if (inuma > inumb) {
2424 ubifs_err(c, "larger inum %lu goes before inum %lu",
2425 (unsigned long)inuma, (unsigned long)inumb);
2426 goto error_dump;
2427 }
2428
2429 hasha = key_block(c, &sa->key);
2430 hashb = key_block(c, &sb->key);
2431
2432 if (hasha > hashb) {
2433 ubifs_err(c, "larger hash %u goes before %u",
2434 hasha, hashb);
2435 goto error_dump;
2436 }
2437 }
2438
2439 return 0;
2440
2441error_dump:
2442 ubifs_msg(c, "dumping first node");
2443 ubifs_dump_node(c, sa->node);
2444 ubifs_msg(c, "dumping second node");
2445 ubifs_dump_node(c, sb->node);
2446 return -EINVAL;
2447 return 0;
2448}
2449
2450static inline int chance(unsigned int n, unsigned int out_of)
2451{
2452 return !!((prandom_u32() % out_of) + 1 <= n);
2453
2454}
2455
2456static int power_cut_emulated(struct ubifs_info *c, int lnum, int write)
2457{
2458 struct ubifs_debug_info *d = c->dbg;
2459
2460 ubifs_assert(dbg_is_tst_rcvry(c));
2461
2462 if (!d->pc_cnt) {
2463 /* First call - decide delay to the power cut */
2464 if (chance(1, 2)) {
2465 unsigned long delay;
2466
2467 if (chance(1, 2)) {
2468 d->pc_delay = 1;
2469 /* Fail within 1 minute */
2470 delay = prandom_u32() % 60000;
2471 d->pc_timeout = jiffies;
2472 d->pc_timeout += msecs_to_jiffies(delay);
2473 ubifs_warn(c, "failing after %lums", delay);
2474 } else {
2475 d->pc_delay = 2;
2476 delay = prandom_u32() % 10000;
2477 /* Fail within 10000 operations */
2478 d->pc_cnt_max = delay;
2479 ubifs_warn(c, "failing after %lu calls", delay);
2480 }
2481 }
2482
2483 d->pc_cnt += 1;
2484 }
2485
2486 /* Determine if failure delay has expired */
2487 if (d->pc_delay == 1 && time_before(jiffies, d->pc_timeout))
2488 return 0;
2489 if (d->pc_delay == 2 && d->pc_cnt++ < d->pc_cnt_max)
2490 return 0;
2491
2492 if (lnum == UBIFS_SB_LNUM) {
2493 if (write && chance(1, 2))
2494 return 0;
2495 if (chance(19, 20))
2496 return 0;
2497 ubifs_warn(c, "failing in super block LEB %d", lnum);
2498 } else if (lnum == UBIFS_MST_LNUM || lnum == UBIFS_MST_LNUM + 1) {
2499 if (chance(19, 20))
2500 return 0;
2501 ubifs_warn(c, "failing in master LEB %d", lnum);
2502 } else if (lnum >= UBIFS_LOG_LNUM && lnum <= c->log_last) {
2503 if (write && chance(99, 100))
2504 return 0;
2505 if (chance(399, 400))
2506 return 0;
2507 ubifs_warn(c, "failing in log LEB %d", lnum);
2508 } else if (lnum >= c->lpt_first && lnum <= c->lpt_last) {
2509 if (write && chance(7, 8))
2510 return 0;
2511 if (chance(19, 20))
2512 return 0;
2513 ubifs_warn(c, "failing in LPT LEB %d", lnum);
2514 } else if (lnum >= c->orph_first && lnum <= c->orph_last) {
2515 if (write && chance(1, 2))
2516 return 0;
2517 if (chance(9, 10))
2518 return 0;
2519 ubifs_warn(c, "failing in orphan LEB %d", lnum);
2520 } else if (lnum == c->ihead_lnum) {
2521 if (chance(99, 100))
2522 return 0;
2523 ubifs_warn(c, "failing in index head LEB %d", lnum);
2524 } else if (c->jheads && lnum == c->jheads[GCHD].wbuf.lnum) {
2525 if (chance(9, 10))
2526 return 0;
2527 ubifs_warn(c, "failing in GC head LEB %d", lnum);
2528 } else if (write && !RB_EMPTY_ROOT(&c->buds) &&
2529 !ubifs_search_bud(c, lnum)) {
2530 if (chance(19, 20))
2531 return 0;
2532 ubifs_warn(c, "failing in non-bud LEB %d", lnum);
2533 } else if (c->cmt_state == COMMIT_RUNNING_BACKGROUND ||
2534 c->cmt_state == COMMIT_RUNNING_REQUIRED) {
2535 if (chance(999, 1000))
2536 return 0;
2537 ubifs_warn(c, "failing in bud LEB %d commit running", lnum);
2538 } else {
2539 if (chance(9999, 10000))
2540 return 0;
2541 ubifs_warn(c, "failing in bud LEB %d commit not running", lnum);
2542 }
2543
2544 d->pc_happened = 1;
2545 ubifs_warn(c, "========== Power cut emulated ==========");
2546 dump_stack();
2547 return 1;
2548}
2549
2550static int corrupt_data(const struct ubifs_info *c, const void *buf,
2551 unsigned int len)
2552{
2553 unsigned int from, to, ffs = chance(1, 2);
2554 unsigned char *p = (void *)buf;
2555
2556 from = prandom_u32() % len;
2557 /* Corruption span max to end of write unit */
2558 to = min(len, ALIGN(from + 1, c->max_write_size));
2559
2560 ubifs_warn(c, "filled bytes %u-%u with %s", from, to - 1,
2561 ffs ? "0xFFs" : "random data");
2562
2563 if (ffs)
2564 memset(p + from, 0xFF, to - from);
2565 else
2566 prandom_bytes(p + from, to - from);
2567
2568 return to;
2569}
2570
2571int dbg_leb_write(struct ubifs_info *c, int lnum, const void *buf,
2572 int offs, int len)
2573{
2574 int err, failing;
2575
2576 if (dbg_is_power_cut(c))
2577 return -EROFS;
2578
2579 failing = power_cut_emulated(c, lnum, 1);
2580 if (failing) {
2581 len = corrupt_data(c, buf, len);
2582 ubifs_warn(c, "actually write %d bytes to LEB %d:%d (the buffer was corrupted)",
2583 len, lnum, offs);
2584 }
2585 err = ubi_leb_write(c->ubi, lnum, buf, offs, len);
2586 if (err)
2587 return err;
2588 if (failing)
2589 return -EROFS;
2590 return 0;
2591}
2592
2593int dbg_leb_change(struct ubifs_info *c, int lnum, const void *buf,
2594 int len)
2595{
2596 int err;
2597
2598 if (dbg_is_power_cut(c))
2599 return -EROFS;
2600 if (power_cut_emulated(c, lnum, 1))
2601 return -EROFS;
2602 err = ubi_leb_change(c->ubi, lnum, buf, len);
2603 if (err)
2604 return err;
2605 if (power_cut_emulated(c, lnum, 1))
2606 return -EROFS;
2607 return 0;
2608}
2609
2610int dbg_leb_unmap(struct ubifs_info *c, int lnum)
2611{
2612 int err;
2613
2614 if (dbg_is_power_cut(c))
2615 return -EROFS;
2616 if (power_cut_emulated(c, lnum, 0))
2617 return -EROFS;
2618 err = ubi_leb_unmap(c->ubi, lnum);
2619 if (err)
2620 return err;
2621 if (power_cut_emulated(c, lnum, 0))
2622 return -EROFS;
2623 return 0;
2624}
2625
2626int dbg_leb_map(struct ubifs_info *c, int lnum)
2627{
2628 int err;
2629
2630 if (dbg_is_power_cut(c))
2631 return -EROFS;
2632 if (power_cut_emulated(c, lnum, 0))
2633 return -EROFS;
2634 err = ubi_leb_map(c->ubi, lnum);
2635 if (err)
2636 return err;
2637 if (power_cut_emulated(c, lnum, 0))
2638 return -EROFS;
2639 return 0;
2640}
2641
2642/*
2643 * Root directory for UBIFS stuff in debugfs. Contains sub-directories which
2644 * contain the stuff specific to particular file-system mounts.
2645 */
2646static struct dentry *dfs_rootdir;
2647
2648static int dfs_file_open(struct inode *inode, struct file *file)
2649{
2650 file->private_data = inode->i_private;
2651 return nonseekable_open(inode, file);
2652}
2653
2654/**
2655 * provide_user_output - provide output to the user reading a debugfs file.
2656 * @val: boolean value for the answer
2657 * @u: the buffer to store the answer at
2658 * @count: size of the buffer
2659 * @ppos: position in the @u output buffer
2660 *
2661 * This is a simple helper function which stores @val boolean value in the user
2662 * buffer when the user reads one of UBIFS debugfs files. Returns amount of
2663 * bytes written to @u in case of success and a negative error code in case of
2664 * failure.
2665 */
2666static int provide_user_output(int val, char __user *u, size_t count,
2667 loff_t *ppos)
2668{
2669 char buf[3];
2670
2671 if (val)
2672 buf[0] = '1';
2673 else
2674 buf[0] = '0';
2675 buf[1] = '\n';
2676 buf[2] = 0x00;
2677
2678 return simple_read_from_buffer(u, count, ppos, buf, 2);
2679}
2680
2681static ssize_t dfs_file_read(struct file *file, char __user *u, size_t count,
2682 loff_t *ppos)
2683{
2684 struct dentry *dent = file->f_path.dentry;
2685 struct ubifs_info *c = file->private_data;
2686 struct ubifs_debug_info *d = c->dbg;
2687 int val;
2688
2689 if (dent == d->dfs_chk_gen)
2690 val = d->chk_gen;
2691 else if (dent == d->dfs_chk_index)
2692 val = d->chk_index;
2693 else if (dent == d->dfs_chk_orph)
2694 val = d->chk_orph;
2695 else if (dent == d->dfs_chk_lprops)
2696 val = d->chk_lprops;
2697 else if (dent == d->dfs_chk_fs)
2698 val = d->chk_fs;
2699 else if (dent == d->dfs_tst_rcvry)
2700 val = d->tst_rcvry;
2701 else if (dent == d->dfs_ro_error)
2702 val = c->ro_error;
2703 else
2704 return -EINVAL;
2705
2706 return provide_user_output(val, u, count, ppos);
2707}
2708
2709/**
2710 * interpret_user_input - interpret user debugfs file input.
2711 * @u: user-provided buffer with the input
2712 * @count: buffer size
2713 *
2714 * This is a helper function which interpret user input to a boolean UBIFS
2715 * debugfs file. Returns %0 or %1 in case of success and a negative error code
2716 * in case of failure.
2717 */
2718static int interpret_user_input(const char __user *u, size_t count)
2719{
2720 size_t buf_size;
2721 char buf[8];
2722
2723 buf_size = min_t(size_t, count, (sizeof(buf) - 1));
2724 if (copy_from_user(buf, u, buf_size))
2725 return -EFAULT;
2726
2727 if (buf[0] == '1')
2728 return 1;
2729 else if (buf[0] == '0')
2730 return 0;
2731
2732 return -EINVAL;
2733}
2734
2735static ssize_t dfs_file_write(struct file *file, const char __user *u,
2736 size_t count, loff_t *ppos)
2737{
2738 struct ubifs_info *c = file->private_data;
2739 struct ubifs_debug_info *d = c->dbg;
2740 struct dentry *dent = file->f_path.dentry;
2741 int val;
2742
2743 /*
2744 * TODO: this is racy - the file-system might have already been
2745 * unmounted and we'd oops in this case. The plan is to fix it with
2746 * help of 'iterate_supers_type()' which we should have in v3.0: when
2747 * a debugfs opened, we rember FS's UUID in file->private_data. Then
2748 * whenever we access the FS via a debugfs file, we iterate all UBIFS
2749 * superblocks and fine the one with the same UUID, and take the
2750 * locking right.
2751 *
2752 * The other way to go suggested by Al Viro is to create a separate
2753 * 'ubifs-debug' file-system instead.
2754 */
2755 if (file->f_path.dentry == d->dfs_dump_lprops) {
2756 ubifs_dump_lprops(c);
2757 return count;
2758 }
2759 if (file->f_path.dentry == d->dfs_dump_budg) {
2760 ubifs_dump_budg(c, &c->bi);
2761 return count;
2762 }
2763 if (file->f_path.dentry == d->dfs_dump_tnc) {
2764 mutex_lock(&c->tnc_mutex);
2765 ubifs_dump_tnc(c);
2766 mutex_unlock(&c->tnc_mutex);
2767 return count;
2768 }
2769
2770 val = interpret_user_input(u, count);
2771 if (val < 0)
2772 return val;
2773
2774 if (dent == d->dfs_chk_gen)
2775 d->chk_gen = val;
2776 else if (dent == d->dfs_chk_index)
2777 d->chk_index = val;
2778 else if (dent == d->dfs_chk_orph)
2779 d->chk_orph = val;
2780 else if (dent == d->dfs_chk_lprops)
2781 d->chk_lprops = val;
2782 else if (dent == d->dfs_chk_fs)
2783 d->chk_fs = val;
2784 else if (dent == d->dfs_tst_rcvry)
2785 d->tst_rcvry = val;
2786 else if (dent == d->dfs_ro_error)
2787 c->ro_error = !!val;
2788 else
2789 return -EINVAL;
2790
2791 return count;
2792}
2793
2794static const struct file_operations dfs_fops = {
2795 .open = dfs_file_open,
2796 .read = dfs_file_read,
2797 .write = dfs_file_write,
2798 .owner = THIS_MODULE,
2799 .llseek = no_llseek,
2800};
2801
2802/**
2803 * dbg_debugfs_init_fs - initialize debugfs for UBIFS instance.
2804 * @c: UBIFS file-system description object
2805 *
2806 * This function creates all debugfs files for this instance of UBIFS. Returns
2807 * zero in case of success and a negative error code in case of failure.
2808 *
2809 * Note, the only reason we have not merged this function with the
2810 * 'ubifs_debugging_init()' function is because it is better to initialize
2811 * debugfs interfaces at the very end of the mount process, and remove them at
2812 * the very beginning of the mount process.
2813 */
2814int dbg_debugfs_init_fs(struct ubifs_info *c)
2815{
2816 int err, n;
2817 const char *fname;
2818 struct dentry *dent;
2819 struct ubifs_debug_info *d = c->dbg;
2820
2821 if (!IS_ENABLED(CONFIG_DEBUG_FS))
2822 return 0;
2823
2824 n = snprintf(d->dfs_dir_name, UBIFS_DFS_DIR_LEN + 1, UBIFS_DFS_DIR_NAME,
2825 c->vi.ubi_num, c->vi.vol_id);
2826 if (n == UBIFS_DFS_DIR_LEN) {
2827 /* The array size is too small */
2828 fname = UBIFS_DFS_DIR_NAME;
2829 dent = ERR_PTR(-EINVAL);
2830 goto out;
2831 }
2832
2833 fname = d->dfs_dir_name;
2834 dent = debugfs_create_dir(fname, dfs_rootdir);
2835 if (IS_ERR_OR_NULL(dent))
2836 goto out;
2837 d->dfs_dir = dent;
2838
2839 fname = "dump_lprops";
2840 dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, c, &dfs_fops);
2841 if (IS_ERR_OR_NULL(dent))
2842 goto out_remove;
2843 d->dfs_dump_lprops = dent;
2844
2845 fname = "dump_budg";
2846 dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, c, &dfs_fops);
2847 if (IS_ERR_OR_NULL(dent))
2848 goto out_remove;
2849 d->dfs_dump_budg = dent;
2850
2851 fname = "dump_tnc";
2852 dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, c, &dfs_fops);
2853 if (IS_ERR_OR_NULL(dent))
2854 goto out_remove;
2855 d->dfs_dump_tnc = dent;
2856
2857 fname = "chk_general";
2858 dent = debugfs_create_file(fname, S_IRUSR | S_IWUSR, d->dfs_dir, c,
2859 &dfs_fops);
2860 if (IS_ERR_OR_NULL(dent))
2861 goto out_remove;
2862 d->dfs_chk_gen = dent;
2863
2864 fname = "chk_index";
2865 dent = debugfs_create_file(fname, S_IRUSR | S_IWUSR, d->dfs_dir, c,
2866 &dfs_fops);
2867 if (IS_ERR_OR_NULL(dent))
2868 goto out_remove;
2869 d->dfs_chk_index = dent;
2870
2871 fname = "chk_orphans";
2872 dent = debugfs_create_file(fname, S_IRUSR | S_IWUSR, d->dfs_dir, c,
2873 &dfs_fops);
2874 if (IS_ERR_OR_NULL(dent))
2875 goto out_remove;
2876 d->dfs_chk_orph = dent;
2877
2878 fname = "chk_lprops";
2879 dent = debugfs_create_file(fname, S_IRUSR | S_IWUSR, d->dfs_dir, c,
2880 &dfs_fops);
2881 if (IS_ERR_OR_NULL(dent))
2882 goto out_remove;
2883 d->dfs_chk_lprops = dent;
2884
2885 fname = "chk_fs";
2886 dent = debugfs_create_file(fname, S_IRUSR | S_IWUSR, d->dfs_dir, c,
2887 &dfs_fops);
2888 if (IS_ERR_OR_NULL(dent))
2889 goto out_remove;
2890 d->dfs_chk_fs = dent;
2891
2892 fname = "tst_recovery";
2893 dent = debugfs_create_file(fname, S_IRUSR | S_IWUSR, d->dfs_dir, c,
2894 &dfs_fops);
2895 if (IS_ERR_OR_NULL(dent))
2896 goto out_remove;
2897 d->dfs_tst_rcvry = dent;
2898
2899 fname = "ro_error";
2900 dent = debugfs_create_file(fname, S_IRUSR | S_IWUSR, d->dfs_dir, c,
2901 &dfs_fops);
2902 if (IS_ERR_OR_NULL(dent))
2903 goto out_remove;
2904 d->dfs_ro_error = dent;
2905
2906 return 0;
2907
2908out_remove:
2909 debugfs_remove_recursive(d->dfs_dir);
2910out:
2911 err = dent ? PTR_ERR(dent) : -ENODEV;
2912 ubifs_err(c, "cannot create \"%s\" debugfs file or directory, error %d\n",
2913 fname, err);
2914 return err;
2915}
2916
2917/**
2918 * dbg_debugfs_exit_fs - remove all debugfs files.
2919 * @c: UBIFS file-system description object
2920 */
2921void dbg_debugfs_exit_fs(struct ubifs_info *c)
2922{
2923 if (IS_ENABLED(CONFIG_DEBUG_FS))
2924 debugfs_remove_recursive(c->dbg->dfs_dir);
2925}
2926
2927struct ubifs_global_debug_info ubifs_dbg;
2928
2929static struct dentry *dfs_chk_gen;
2930static struct dentry *dfs_chk_index;
2931static struct dentry *dfs_chk_orph;
2932static struct dentry *dfs_chk_lprops;
2933static struct dentry *dfs_chk_fs;
2934static struct dentry *dfs_tst_rcvry;
2935
2936static ssize_t dfs_global_file_read(struct file *file, char __user *u,
2937 size_t count, loff_t *ppos)
2938{
2939 struct dentry *dent = file->f_path.dentry;
2940 int val;
2941
2942 if (dent == dfs_chk_gen)
2943 val = ubifs_dbg.chk_gen;
2944 else if (dent == dfs_chk_index)
2945 val = ubifs_dbg.chk_index;
2946 else if (dent == dfs_chk_orph)
2947 val = ubifs_dbg.chk_orph;
2948 else if (dent == dfs_chk_lprops)
2949 val = ubifs_dbg.chk_lprops;
2950 else if (dent == dfs_chk_fs)
2951 val = ubifs_dbg.chk_fs;
2952 else if (dent == dfs_tst_rcvry)
2953 val = ubifs_dbg.tst_rcvry;
2954 else
2955 return -EINVAL;
2956
2957 return provide_user_output(val, u, count, ppos);
2958}
2959
2960static ssize_t dfs_global_file_write(struct file *file, const char __user *u,
2961 size_t count, loff_t *ppos)
2962{
2963 struct dentry *dent = file->f_path.dentry;
2964 int val;
2965
2966 val = interpret_user_input(u, count);
2967 if (val < 0)
2968 return val;
2969
2970 if (dent == dfs_chk_gen)
2971 ubifs_dbg.chk_gen = val;
2972 else if (dent == dfs_chk_index)
2973 ubifs_dbg.chk_index = val;
2974 else if (dent == dfs_chk_orph)
2975 ubifs_dbg.chk_orph = val;
2976 else if (dent == dfs_chk_lprops)
2977 ubifs_dbg.chk_lprops = val;
2978 else if (dent == dfs_chk_fs)
2979 ubifs_dbg.chk_fs = val;
2980 else if (dent == dfs_tst_rcvry)
2981 ubifs_dbg.tst_rcvry = val;
2982 else
2983 return -EINVAL;
2984
2985 return count;
2986}
2987
2988static const struct file_operations dfs_global_fops = {
2989 .read = dfs_global_file_read,
2990 .write = dfs_global_file_write,
2991 .owner = THIS_MODULE,
2992 .llseek = no_llseek,
2993};
2994
2995/**
2996 * dbg_debugfs_init - initialize debugfs file-system.
2997 *
2998 * UBIFS uses debugfs file-system to expose various debugging knobs to
2999 * user-space. This function creates "ubifs" directory in the debugfs
3000 * file-system. Returns zero in case of success and a negative error code in
3001 * case of failure.
3002 */
3003int dbg_debugfs_init(void)
3004{
3005 int err;
3006 const char *fname;
3007 struct dentry *dent;
3008
3009 if (!IS_ENABLED(CONFIG_DEBUG_FS))
3010 return 0;
3011
3012 fname = "ubifs";
3013 dent = debugfs_create_dir(fname, NULL);
3014 if (IS_ERR_OR_NULL(dent))
3015 goto out;
3016 dfs_rootdir = dent;
3017
3018 fname = "chk_general";
3019 dent = debugfs_create_file(fname, S_IRUSR | S_IWUSR, dfs_rootdir, NULL,
3020 &dfs_global_fops);
3021 if (IS_ERR_OR_NULL(dent))
3022 goto out_remove;
3023 dfs_chk_gen = dent;
3024
3025 fname = "chk_index";
3026 dent = debugfs_create_file(fname, S_IRUSR | S_IWUSR, dfs_rootdir, NULL,
3027 &dfs_global_fops);
3028 if (IS_ERR_OR_NULL(dent))
3029 goto out_remove;
3030 dfs_chk_index = dent;
3031
3032 fname = "chk_orphans";
3033 dent = debugfs_create_file(fname, S_IRUSR | S_IWUSR, dfs_rootdir, NULL,
3034 &dfs_global_fops);
3035 if (IS_ERR_OR_NULL(dent))
3036 goto out_remove;
3037 dfs_chk_orph = dent;
3038
3039 fname = "chk_lprops";
3040 dent = debugfs_create_file(fname, S_IRUSR | S_IWUSR, dfs_rootdir, NULL,
3041 &dfs_global_fops);
3042 if (IS_ERR_OR_NULL(dent))
3043 goto out_remove;
3044 dfs_chk_lprops = dent;
3045
3046 fname = "chk_fs";
3047 dent = debugfs_create_file(fname, S_IRUSR | S_IWUSR, dfs_rootdir, NULL,
3048 &dfs_global_fops);
3049 if (IS_ERR_OR_NULL(dent))
3050 goto out_remove;
3051 dfs_chk_fs = dent;
3052
3053 fname = "tst_recovery";
3054 dent = debugfs_create_file(fname, S_IRUSR | S_IWUSR, dfs_rootdir, NULL,
3055 &dfs_global_fops);
3056 if (IS_ERR_OR_NULL(dent))
3057 goto out_remove;
3058 dfs_tst_rcvry = dent;
3059
3060 return 0;
3061
3062out_remove:
3063 debugfs_remove_recursive(dfs_rootdir);
3064out:
3065 err = dent ? PTR_ERR(dent) : -ENODEV;
3066 pr_err("UBIFS error (pid %d): cannot create \"%s\" debugfs file or directory, error %d\n",
3067 current->pid, fname, err);
3068 return err;
3069}
3070
3071/**
3072 * dbg_debugfs_exit - remove the "ubifs" directory from debugfs file-system.
3073 */
3074void dbg_debugfs_exit(void)
3075{
3076 if (IS_ENABLED(CONFIG_DEBUG_FS))
3077 debugfs_remove_recursive(dfs_rootdir);
3078}
3079
3080/**
3081 * ubifs_debugging_init - initialize UBIFS debugging.
3082 * @c: UBIFS file-system description object
3083 *
3084 * This function initializes debugging-related data for the file system.
3085 * Returns zero in case of success and a negative error code in case of
3086 * failure.
3087 */
3088int ubifs_debugging_init(struct ubifs_info *c)
3089{
3090 c->dbg = kzalloc(sizeof(struct ubifs_debug_info), GFP_KERNEL);
3091 if (!c->dbg)
3092 return -ENOMEM;
3093
3094 return 0;
3095}
3096
3097/**
3098 * ubifs_debugging_exit - free debugging data.
3099 * @c: UBIFS file-system description object
3100 */
3101void ubifs_debugging_exit(struct ubifs_info *c)
3102{
3103 kfree(c->dbg);
3104}
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
37static DEFINE_SPINLOCK(dbg_lock);
38
39static const char *get_key_fmt(int fmt)
40{
41 switch (fmt) {
42 case UBIFS_SIMPLE_KEY_FMT:
43 return "simple";
44 default:
45 return "unknown/invalid format";
46 }
47}
48
49static const char *get_key_hash(int hash)
50{
51 switch (hash) {
52 case UBIFS_KEY_HASH_R5:
53 return "R5";
54 case UBIFS_KEY_HASH_TEST:
55 return "test";
56 default:
57 return "unknown/invalid name hash";
58 }
59}
60
61static const char *get_key_type(int type)
62{
63 switch (type) {
64 case UBIFS_INO_KEY:
65 return "inode";
66 case UBIFS_DENT_KEY:
67 return "direntry";
68 case UBIFS_XENT_KEY:
69 return "xentry";
70 case UBIFS_DATA_KEY:
71 return "data";
72 case UBIFS_TRUN_KEY:
73 return "truncate";
74 default:
75 return "unknown/invalid key";
76 }
77}
78
79static const char *get_dent_type(int type)
80{
81 switch (type) {
82 case UBIFS_ITYPE_REG:
83 return "file";
84 case UBIFS_ITYPE_DIR:
85 return "dir";
86 case UBIFS_ITYPE_LNK:
87 return "symlink";
88 case UBIFS_ITYPE_BLK:
89 return "blkdev";
90 case UBIFS_ITYPE_CHR:
91 return "char dev";
92 case UBIFS_ITYPE_FIFO:
93 return "fifo";
94 case UBIFS_ITYPE_SOCK:
95 return "socket";
96 default:
97 return "unknown/invalid type";
98 }
99}
100
101const char *dbg_snprintf_key(const struct ubifs_info *c,
102 const union ubifs_key *key, char *buffer, int len)
103{
104 char *p = buffer;
105 int type = key_type(c, key);
106
107 if (c->key_fmt == UBIFS_SIMPLE_KEY_FMT) {
108 switch (type) {
109 case UBIFS_INO_KEY:
110 len -= snprintf(p, len, "(%lu, %s)",
111 (unsigned long)key_inum(c, key),
112 get_key_type(type));
113 break;
114 case UBIFS_DENT_KEY:
115 case UBIFS_XENT_KEY:
116 len -= snprintf(p, len, "(%lu, %s, %#08x)",
117 (unsigned long)key_inum(c, key),
118 get_key_type(type), key_hash(c, key));
119 break;
120 case UBIFS_DATA_KEY:
121 len -= snprintf(p, len, "(%lu, %s, %u)",
122 (unsigned long)key_inum(c, key),
123 get_key_type(type), key_block(c, key));
124 break;
125 case UBIFS_TRUN_KEY:
126 len -= snprintf(p, len, "(%lu, %s)",
127 (unsigned long)key_inum(c, key),
128 get_key_type(type));
129 break;
130 default:
131 len -= snprintf(p, len, "(bad key type: %#08x, %#08x)",
132 key->u32[0], key->u32[1]);
133 }
134 } else
135 len -= snprintf(p, len, "bad key format %d", c->key_fmt);
136 ubifs_assert(len > 0);
137 return p;
138}
139
140const char *dbg_ntype(int type)
141{
142 switch (type) {
143 case UBIFS_PAD_NODE:
144 return "padding node";
145 case UBIFS_SB_NODE:
146 return "superblock node";
147 case UBIFS_MST_NODE:
148 return "master node";
149 case UBIFS_REF_NODE:
150 return "reference node";
151 case UBIFS_INO_NODE:
152 return "inode node";
153 case UBIFS_DENT_NODE:
154 return "direntry node";
155 case UBIFS_XENT_NODE:
156 return "xentry node";
157 case UBIFS_DATA_NODE:
158 return "data node";
159 case UBIFS_TRUN_NODE:
160 return "truncate node";
161 case UBIFS_IDX_NODE:
162 return "indexing node";
163 case UBIFS_CS_NODE:
164 return "commit start node";
165 case UBIFS_ORPH_NODE:
166 return "orphan node";
167 default:
168 return "unknown node";
169 }
170}
171
172static const char *dbg_gtype(int type)
173{
174 switch (type) {
175 case UBIFS_NO_NODE_GROUP:
176 return "no node group";
177 case UBIFS_IN_NODE_GROUP:
178 return "in node group";
179 case UBIFS_LAST_OF_NODE_GROUP:
180 return "last of node group";
181 default:
182 return "unknown";
183 }
184}
185
186const char *dbg_cstate(int cmt_state)
187{
188 switch (cmt_state) {
189 case COMMIT_RESTING:
190 return "commit resting";
191 case COMMIT_BACKGROUND:
192 return "background commit requested";
193 case COMMIT_REQUIRED:
194 return "commit required";
195 case COMMIT_RUNNING_BACKGROUND:
196 return "BACKGROUND commit running";
197 case COMMIT_RUNNING_REQUIRED:
198 return "commit running and required";
199 case COMMIT_BROKEN:
200 return "broken commit";
201 default:
202 return "unknown commit state";
203 }
204}
205
206const char *dbg_jhead(int jhead)
207{
208 switch (jhead) {
209 case GCHD:
210 return "0 (GC)";
211 case BASEHD:
212 return "1 (base)";
213 case DATAHD:
214 return "2 (data)";
215 default:
216 return "unknown journal head";
217 }
218}
219
220static void dump_ch(const struct ubifs_ch *ch)
221{
222 pr_err("\tmagic %#x\n", le32_to_cpu(ch->magic));
223 pr_err("\tcrc %#x\n", le32_to_cpu(ch->crc));
224 pr_err("\tnode_type %d (%s)\n", ch->node_type,
225 dbg_ntype(ch->node_type));
226 pr_err("\tgroup_type %d (%s)\n", ch->group_type,
227 dbg_gtype(ch->group_type));
228 pr_err("\tsqnum %llu\n",
229 (unsigned long long)le64_to_cpu(ch->sqnum));
230 pr_err("\tlen %u\n", le32_to_cpu(ch->len));
231}
232
233void ubifs_dump_inode(struct ubifs_info *c, const struct inode *inode)
234{
235 const struct ubifs_inode *ui = ubifs_inode(inode);
236 struct qstr nm = { .name = NULL };
237 union ubifs_key key;
238 struct ubifs_dent_node *dent, *pdent = NULL;
239 int count = 2;
240
241 pr_err("Dump in-memory inode:");
242 pr_err("\tinode %lu\n", inode->i_ino);
243 pr_err("\tsize %llu\n",
244 (unsigned long long)i_size_read(inode));
245 pr_err("\tnlink %u\n", inode->i_nlink);
246 pr_err("\tuid %u\n", (unsigned int)i_uid_read(inode));
247 pr_err("\tgid %u\n", (unsigned int)i_gid_read(inode));
248 pr_err("\tatime %u.%u\n",
249 (unsigned int)inode->i_atime.tv_sec,
250 (unsigned int)inode->i_atime.tv_nsec);
251 pr_err("\tmtime %u.%u\n",
252 (unsigned int)inode->i_mtime.tv_sec,
253 (unsigned int)inode->i_mtime.tv_nsec);
254 pr_err("\tctime %u.%u\n",
255 (unsigned int)inode->i_ctime.tv_sec,
256 (unsigned int)inode->i_ctime.tv_nsec);
257 pr_err("\tcreat_sqnum %llu\n", ui->creat_sqnum);
258 pr_err("\txattr_size %u\n", ui->xattr_size);
259 pr_err("\txattr_cnt %u\n", ui->xattr_cnt);
260 pr_err("\txattr_names %u\n", ui->xattr_names);
261 pr_err("\tdirty %u\n", ui->dirty);
262 pr_err("\txattr %u\n", ui->xattr);
263 pr_err("\tbulk_read %u\n", ui->xattr);
264 pr_err("\tsynced_i_size %llu\n",
265 (unsigned long long)ui->synced_i_size);
266 pr_err("\tui_size %llu\n",
267 (unsigned long long)ui->ui_size);
268 pr_err("\tflags %d\n", ui->flags);
269 pr_err("\tcompr_type %d\n", ui->compr_type);
270 pr_err("\tlast_page_read %lu\n", ui->last_page_read);
271 pr_err("\tread_in_a_row %lu\n", ui->read_in_a_row);
272 pr_err("\tdata_len %d\n", ui->data_len);
273
274 if (!S_ISDIR(inode->i_mode))
275 return;
276
277 pr_err("List of directory entries:\n");
278 ubifs_assert(!mutex_is_locked(&c->tnc_mutex));
279
280 lowest_dent_key(c, &key, inode->i_ino);
281 while (1) {
282 dent = ubifs_tnc_next_ent(c, &key, &nm);
283 if (IS_ERR(dent)) {
284 if (PTR_ERR(dent) != -ENOENT)
285 pr_err("error %ld\n", PTR_ERR(dent));
286 break;
287 }
288
289 pr_err("\t%d: %s (%s)\n",
290 count++, dent->name, get_dent_type(dent->type));
291
292 nm.name = dent->name;
293 nm.len = le16_to_cpu(dent->nlen);
294 kfree(pdent);
295 pdent = dent;
296 key_read(c, &dent->key, &key);
297 }
298 kfree(pdent);
299}
300
301void ubifs_dump_node(const struct ubifs_info *c, const void *node)
302{
303 int i, n;
304 union ubifs_key key;
305 const struct ubifs_ch *ch = node;
306 char key_buf[DBG_KEY_BUF_LEN];
307
308 /* If the magic is incorrect, just hexdump the first bytes */
309 if (le32_to_cpu(ch->magic) != UBIFS_NODE_MAGIC) {
310 pr_err("Not a node, first %zu bytes:", UBIFS_CH_SZ);
311 print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 32, 1,
312 (void *)node, UBIFS_CH_SZ, 1);
313 return;
314 }
315
316 spin_lock(&dbg_lock);
317 dump_ch(node);
318
319 switch (ch->node_type) {
320 case UBIFS_PAD_NODE:
321 {
322 const struct ubifs_pad_node *pad = node;
323
324 pr_err("\tpad_len %u\n", le32_to_cpu(pad->pad_len));
325 break;
326 }
327 case UBIFS_SB_NODE:
328 {
329 const struct ubifs_sb_node *sup = node;
330 unsigned int sup_flags = le32_to_cpu(sup->flags);
331
332 pr_err("\tkey_hash %d (%s)\n",
333 (int)sup->key_hash, get_key_hash(sup->key_hash));
334 pr_err("\tkey_fmt %d (%s)\n",
335 (int)sup->key_fmt, get_key_fmt(sup->key_fmt));
336 pr_err("\tflags %#x\n", sup_flags);
337 pr_err("\t big_lpt %u\n",
338 !!(sup_flags & UBIFS_FLG_BIGLPT));
339 pr_err("\t space_fixup %u\n",
340 !!(sup_flags & UBIFS_FLG_SPACE_FIXUP));
341 pr_err("\tmin_io_size %u\n", le32_to_cpu(sup->min_io_size));
342 pr_err("\tleb_size %u\n", le32_to_cpu(sup->leb_size));
343 pr_err("\tleb_cnt %u\n", le32_to_cpu(sup->leb_cnt));
344 pr_err("\tmax_leb_cnt %u\n", le32_to_cpu(sup->max_leb_cnt));
345 pr_err("\tmax_bud_bytes %llu\n",
346 (unsigned long long)le64_to_cpu(sup->max_bud_bytes));
347 pr_err("\tlog_lebs %u\n", le32_to_cpu(sup->log_lebs));
348 pr_err("\tlpt_lebs %u\n", le32_to_cpu(sup->lpt_lebs));
349 pr_err("\torph_lebs %u\n", le32_to_cpu(sup->orph_lebs));
350 pr_err("\tjhead_cnt %u\n", le32_to_cpu(sup->jhead_cnt));
351 pr_err("\tfanout %u\n", le32_to_cpu(sup->fanout));
352 pr_err("\tlsave_cnt %u\n", le32_to_cpu(sup->lsave_cnt));
353 pr_err("\tdefault_compr %u\n",
354 (int)le16_to_cpu(sup->default_compr));
355 pr_err("\trp_size %llu\n",
356 (unsigned long long)le64_to_cpu(sup->rp_size));
357 pr_err("\trp_uid %u\n", le32_to_cpu(sup->rp_uid));
358 pr_err("\trp_gid %u\n", le32_to_cpu(sup->rp_gid));
359 pr_err("\tfmt_version %u\n", le32_to_cpu(sup->fmt_version));
360 pr_err("\ttime_gran %u\n", le32_to_cpu(sup->time_gran));
361 pr_err("\tUUID %pUB\n", sup->uuid);
362 break;
363 }
364 case UBIFS_MST_NODE:
365 {
366 const struct ubifs_mst_node *mst = node;
367
368 pr_err("\thighest_inum %llu\n",
369 (unsigned long long)le64_to_cpu(mst->highest_inum));
370 pr_err("\tcommit number %llu\n",
371 (unsigned long long)le64_to_cpu(mst->cmt_no));
372 pr_err("\tflags %#x\n", le32_to_cpu(mst->flags));
373 pr_err("\tlog_lnum %u\n", le32_to_cpu(mst->log_lnum));
374 pr_err("\troot_lnum %u\n", le32_to_cpu(mst->root_lnum));
375 pr_err("\troot_offs %u\n", le32_to_cpu(mst->root_offs));
376 pr_err("\troot_len %u\n", le32_to_cpu(mst->root_len));
377 pr_err("\tgc_lnum %u\n", le32_to_cpu(mst->gc_lnum));
378 pr_err("\tihead_lnum %u\n", le32_to_cpu(mst->ihead_lnum));
379 pr_err("\tihead_offs %u\n", le32_to_cpu(mst->ihead_offs));
380 pr_err("\tindex_size %llu\n",
381 (unsigned long long)le64_to_cpu(mst->index_size));
382 pr_err("\tlpt_lnum %u\n", le32_to_cpu(mst->lpt_lnum));
383 pr_err("\tlpt_offs %u\n", le32_to_cpu(mst->lpt_offs));
384 pr_err("\tnhead_lnum %u\n", le32_to_cpu(mst->nhead_lnum));
385 pr_err("\tnhead_offs %u\n", le32_to_cpu(mst->nhead_offs));
386 pr_err("\tltab_lnum %u\n", le32_to_cpu(mst->ltab_lnum));
387 pr_err("\tltab_offs %u\n", le32_to_cpu(mst->ltab_offs));
388 pr_err("\tlsave_lnum %u\n", le32_to_cpu(mst->lsave_lnum));
389 pr_err("\tlsave_offs %u\n", le32_to_cpu(mst->lsave_offs));
390 pr_err("\tlscan_lnum %u\n", le32_to_cpu(mst->lscan_lnum));
391 pr_err("\tleb_cnt %u\n", le32_to_cpu(mst->leb_cnt));
392 pr_err("\tempty_lebs %u\n", le32_to_cpu(mst->empty_lebs));
393 pr_err("\tidx_lebs %u\n", le32_to_cpu(mst->idx_lebs));
394 pr_err("\ttotal_free %llu\n",
395 (unsigned long long)le64_to_cpu(mst->total_free));
396 pr_err("\ttotal_dirty %llu\n",
397 (unsigned long long)le64_to_cpu(mst->total_dirty));
398 pr_err("\ttotal_used %llu\n",
399 (unsigned long long)le64_to_cpu(mst->total_used));
400 pr_err("\ttotal_dead %llu\n",
401 (unsigned long long)le64_to_cpu(mst->total_dead));
402 pr_err("\ttotal_dark %llu\n",
403 (unsigned long long)le64_to_cpu(mst->total_dark));
404 break;
405 }
406 case UBIFS_REF_NODE:
407 {
408 const struct ubifs_ref_node *ref = node;
409
410 pr_err("\tlnum %u\n", le32_to_cpu(ref->lnum));
411 pr_err("\toffs %u\n", le32_to_cpu(ref->offs));
412 pr_err("\tjhead %u\n", le32_to_cpu(ref->jhead));
413 break;
414 }
415 case UBIFS_INO_NODE:
416 {
417 const struct ubifs_ino_node *ino = node;
418
419 key_read(c, &ino->key, &key);
420 pr_err("\tkey %s\n",
421 dbg_snprintf_key(c, &key, key_buf, DBG_KEY_BUF_LEN));
422 pr_err("\tcreat_sqnum %llu\n",
423 (unsigned long long)le64_to_cpu(ino->creat_sqnum));
424 pr_err("\tsize %llu\n",
425 (unsigned long long)le64_to_cpu(ino->size));
426 pr_err("\tnlink %u\n", le32_to_cpu(ino->nlink));
427 pr_err("\tatime %lld.%u\n",
428 (long long)le64_to_cpu(ino->atime_sec),
429 le32_to_cpu(ino->atime_nsec));
430 pr_err("\tmtime %lld.%u\n",
431 (long long)le64_to_cpu(ino->mtime_sec),
432 le32_to_cpu(ino->mtime_nsec));
433 pr_err("\tctime %lld.%u\n",
434 (long long)le64_to_cpu(ino->ctime_sec),
435 le32_to_cpu(ino->ctime_nsec));
436 pr_err("\tuid %u\n", le32_to_cpu(ino->uid));
437 pr_err("\tgid %u\n", le32_to_cpu(ino->gid));
438 pr_err("\tmode %u\n", le32_to_cpu(ino->mode));
439 pr_err("\tflags %#x\n", le32_to_cpu(ino->flags));
440 pr_err("\txattr_cnt %u\n", le32_to_cpu(ino->xattr_cnt));
441 pr_err("\txattr_size %u\n", le32_to_cpu(ino->xattr_size));
442 pr_err("\txattr_names %u\n", le32_to_cpu(ino->xattr_names));
443 pr_err("\tcompr_type %#x\n",
444 (int)le16_to_cpu(ino->compr_type));
445 pr_err("\tdata len %u\n", le32_to_cpu(ino->data_len));
446 break;
447 }
448 case UBIFS_DENT_NODE:
449 case UBIFS_XENT_NODE:
450 {
451 const struct ubifs_dent_node *dent = node;
452 int nlen = le16_to_cpu(dent->nlen);
453
454 key_read(c, &dent->key, &key);
455 pr_err("\tkey %s\n",
456 dbg_snprintf_key(c, &key, key_buf, DBG_KEY_BUF_LEN));
457 pr_err("\tinum %llu\n",
458 (unsigned long long)le64_to_cpu(dent->inum));
459 pr_err("\ttype %d\n", (int)dent->type);
460 pr_err("\tnlen %d\n", nlen);
461 pr_err("\tname ");
462
463 if (nlen > UBIFS_MAX_NLEN)
464 pr_err("(bad name length, not printing, bad or corrupted node)");
465 else {
466 for (i = 0; i < nlen && dent->name[i]; i++)
467 pr_cont("%c", dent->name[i]);
468 }
469 pr_cont("\n");
470
471 break;
472 }
473 case UBIFS_DATA_NODE:
474 {
475 const struct ubifs_data_node *dn = node;
476 int dlen = le32_to_cpu(ch->len) - UBIFS_DATA_NODE_SZ;
477
478 key_read(c, &dn->key, &key);
479 pr_err("\tkey %s\n",
480 dbg_snprintf_key(c, &key, key_buf, DBG_KEY_BUF_LEN));
481 pr_err("\tsize %u\n", le32_to_cpu(dn->size));
482 pr_err("\tcompr_typ %d\n",
483 (int)le16_to_cpu(dn->compr_type));
484 pr_err("\tdata size %d\n", dlen);
485 pr_err("\tdata:\n");
486 print_hex_dump(KERN_ERR, "\t", DUMP_PREFIX_OFFSET, 32, 1,
487 (void *)&dn->data, dlen, 0);
488 break;
489 }
490 case UBIFS_TRUN_NODE:
491 {
492 const struct ubifs_trun_node *trun = node;
493
494 pr_err("\tinum %u\n", le32_to_cpu(trun->inum));
495 pr_err("\told_size %llu\n",
496 (unsigned long long)le64_to_cpu(trun->old_size));
497 pr_err("\tnew_size %llu\n",
498 (unsigned long long)le64_to_cpu(trun->new_size));
499 break;
500 }
501 case UBIFS_IDX_NODE:
502 {
503 const struct ubifs_idx_node *idx = node;
504
505 n = le16_to_cpu(idx->child_cnt);
506 pr_err("\tchild_cnt %d\n", n);
507 pr_err("\tlevel %d\n", (int)le16_to_cpu(idx->level));
508 pr_err("\tBranches:\n");
509
510 for (i = 0; i < n && i < c->fanout - 1; i++) {
511 const struct ubifs_branch *br;
512
513 br = ubifs_idx_branch(c, idx, i);
514 key_read(c, &br->key, &key);
515 pr_err("\t%d: LEB %d:%d len %d key %s\n",
516 i, le32_to_cpu(br->lnum), le32_to_cpu(br->offs),
517 le32_to_cpu(br->len),
518 dbg_snprintf_key(c, &key, key_buf,
519 DBG_KEY_BUF_LEN));
520 }
521 break;
522 }
523 case UBIFS_CS_NODE:
524 break;
525 case UBIFS_ORPH_NODE:
526 {
527 const struct ubifs_orph_node *orph = node;
528
529 pr_err("\tcommit number %llu\n",
530 (unsigned long long)
531 le64_to_cpu(orph->cmt_no) & LLONG_MAX);
532 pr_err("\tlast node flag %llu\n",
533 (unsigned long long)(le64_to_cpu(orph->cmt_no)) >> 63);
534 n = (le32_to_cpu(ch->len) - UBIFS_ORPH_NODE_SZ) >> 3;
535 pr_err("\t%d orphan inode numbers:\n", n);
536 for (i = 0; i < n; i++)
537 pr_err("\t ino %llu\n",
538 (unsigned long long)le64_to_cpu(orph->inos[i]));
539 break;
540 }
541 default:
542 pr_err("node type %d was not recognized\n",
543 (int)ch->node_type);
544 }
545 spin_unlock(&dbg_lock);
546}
547
548void ubifs_dump_budget_req(const struct ubifs_budget_req *req)
549{
550 spin_lock(&dbg_lock);
551 pr_err("Budgeting request: new_ino %d, dirtied_ino %d\n",
552 req->new_ino, req->dirtied_ino);
553 pr_err("\tnew_ino_d %d, dirtied_ino_d %d\n",
554 req->new_ino_d, req->dirtied_ino_d);
555 pr_err("\tnew_page %d, dirtied_page %d\n",
556 req->new_page, req->dirtied_page);
557 pr_err("\tnew_dent %d, mod_dent %d\n",
558 req->new_dent, req->mod_dent);
559 pr_err("\tidx_growth %d\n", req->idx_growth);
560 pr_err("\tdata_growth %d dd_growth %d\n",
561 req->data_growth, req->dd_growth);
562 spin_unlock(&dbg_lock);
563}
564
565void ubifs_dump_lstats(const struct ubifs_lp_stats *lst)
566{
567 spin_lock(&dbg_lock);
568 pr_err("(pid %d) Lprops statistics: empty_lebs %d, idx_lebs %d\n",
569 current->pid, lst->empty_lebs, lst->idx_lebs);
570 pr_err("\ttaken_empty_lebs %d, total_free %lld, total_dirty %lld\n",
571 lst->taken_empty_lebs, lst->total_free, lst->total_dirty);
572 pr_err("\ttotal_used %lld, total_dark %lld, total_dead %lld\n",
573 lst->total_used, lst->total_dark, lst->total_dead);
574 spin_unlock(&dbg_lock);
575}
576
577void ubifs_dump_budg(struct ubifs_info *c, const struct ubifs_budg_info *bi)
578{
579 int i;
580 struct rb_node *rb;
581 struct ubifs_bud *bud;
582 struct ubifs_gced_idx_leb *idx_gc;
583 long long available, outstanding, free;
584
585 spin_lock(&c->space_lock);
586 spin_lock(&dbg_lock);
587 pr_err("(pid %d) Budgeting info: data budget sum %lld, total budget sum %lld\n",
588 current->pid, bi->data_growth + bi->dd_growth,
589 bi->data_growth + bi->dd_growth + bi->idx_growth);
590 pr_err("\tbudg_data_growth %lld, budg_dd_growth %lld, budg_idx_growth %lld\n",
591 bi->data_growth, bi->dd_growth, bi->idx_growth);
592 pr_err("\tmin_idx_lebs %d, old_idx_sz %llu, uncommitted_idx %lld\n",
593 bi->min_idx_lebs, bi->old_idx_sz, bi->uncommitted_idx);
594 pr_err("\tpage_budget %d, inode_budget %d, dent_budget %d\n",
595 bi->page_budget, bi->inode_budget, bi->dent_budget);
596 pr_err("\tnospace %u, nospace_rp %u\n", bi->nospace, bi->nospace_rp);
597 pr_err("\tdark_wm %d, dead_wm %d, max_idx_node_sz %d\n",
598 c->dark_wm, c->dead_wm, c->max_idx_node_sz);
599
600 if (bi != &c->bi)
601 /*
602 * If we are dumping saved budgeting data, do not print
603 * additional information which is about the current state, not
604 * the old one which corresponded to the saved budgeting data.
605 */
606 goto out_unlock;
607
608 pr_err("\tfreeable_cnt %d, calc_idx_sz %lld, idx_gc_cnt %d\n",
609 c->freeable_cnt, c->calc_idx_sz, c->idx_gc_cnt);
610 pr_err("\tdirty_pg_cnt %ld, dirty_zn_cnt %ld, clean_zn_cnt %ld\n",
611 atomic_long_read(&c->dirty_pg_cnt),
612 atomic_long_read(&c->dirty_zn_cnt),
613 atomic_long_read(&c->clean_zn_cnt));
614 pr_err("\tgc_lnum %d, ihead_lnum %d\n", c->gc_lnum, c->ihead_lnum);
615
616 /* If we are in R/O mode, journal heads do not exist */
617 if (c->jheads)
618 for (i = 0; i < c->jhead_cnt; i++)
619 pr_err("\tjhead %s\t LEB %d\n",
620 dbg_jhead(c->jheads[i].wbuf.jhead),
621 c->jheads[i].wbuf.lnum);
622 for (rb = rb_first(&c->buds); rb; rb = rb_next(rb)) {
623 bud = rb_entry(rb, struct ubifs_bud, rb);
624 pr_err("\tbud LEB %d\n", bud->lnum);
625 }
626 list_for_each_entry(bud, &c->old_buds, list)
627 pr_err("\told bud LEB %d\n", bud->lnum);
628 list_for_each_entry(idx_gc, &c->idx_gc, list)
629 pr_err("\tGC'ed idx LEB %d unmap %d\n",
630 idx_gc->lnum, idx_gc->unmap);
631 pr_err("\tcommit state %d\n", c->cmt_state);
632
633 /* Print budgeting predictions */
634 available = ubifs_calc_available(c, c->bi.min_idx_lebs);
635 outstanding = c->bi.data_growth + c->bi.dd_growth;
636 free = ubifs_get_free_space_nolock(c);
637 pr_err("Budgeting predictions:\n");
638 pr_err("\tavailable: %lld, outstanding %lld, free %lld\n",
639 available, outstanding, free);
640out_unlock:
641 spin_unlock(&dbg_lock);
642 spin_unlock(&c->space_lock);
643}
644
645void ubifs_dump_lprop(const struct ubifs_info *c, const struct ubifs_lprops *lp)
646{
647 int i, spc, dark = 0, dead = 0;
648 struct rb_node *rb;
649 struct ubifs_bud *bud;
650
651 spc = lp->free + lp->dirty;
652 if (spc < c->dead_wm)
653 dead = spc;
654 else
655 dark = ubifs_calc_dark(c, spc);
656
657 if (lp->flags & LPROPS_INDEX)
658 pr_err("LEB %-7d free %-8d dirty %-8d used %-8d free + dirty %-8d flags %#x (",
659 lp->lnum, lp->free, lp->dirty, c->leb_size - spc, spc,
660 lp->flags);
661 else
662 pr_err("LEB %-7d free %-8d dirty %-8d used %-8d free + dirty %-8d dark %-4d dead %-4d nodes fit %-3d flags %#-4x (",
663 lp->lnum, lp->free, lp->dirty, c->leb_size - spc, spc,
664 dark, dead, (int)(spc / UBIFS_MAX_NODE_SZ), lp->flags);
665
666 if (lp->flags & LPROPS_TAKEN) {
667 if (lp->flags & LPROPS_INDEX)
668 pr_cont("index, taken");
669 else
670 pr_cont("taken");
671 } else {
672 const char *s;
673
674 if (lp->flags & LPROPS_INDEX) {
675 switch (lp->flags & LPROPS_CAT_MASK) {
676 case LPROPS_DIRTY_IDX:
677 s = "dirty index";
678 break;
679 case LPROPS_FRDI_IDX:
680 s = "freeable index";
681 break;
682 default:
683 s = "index";
684 }
685 } else {
686 switch (lp->flags & LPROPS_CAT_MASK) {
687 case LPROPS_UNCAT:
688 s = "not categorized";
689 break;
690 case LPROPS_DIRTY:
691 s = "dirty";
692 break;
693 case LPROPS_FREE:
694 s = "free";
695 break;
696 case LPROPS_EMPTY:
697 s = "empty";
698 break;
699 case LPROPS_FREEABLE:
700 s = "freeable";
701 break;
702 default:
703 s = NULL;
704 break;
705 }
706 }
707 pr_cont("%s", s);
708 }
709
710 for (rb = rb_first((struct rb_root *)&c->buds); rb; rb = rb_next(rb)) {
711 bud = rb_entry(rb, struct ubifs_bud, rb);
712 if (bud->lnum == lp->lnum) {
713 int head = 0;
714 for (i = 0; i < c->jhead_cnt; i++) {
715 /*
716 * Note, if we are in R/O mode or in the middle
717 * of mounting/re-mounting, the write-buffers do
718 * not exist.
719 */
720 if (c->jheads &&
721 lp->lnum == c->jheads[i].wbuf.lnum) {
722 pr_cont(", jhead %s", dbg_jhead(i));
723 head = 1;
724 }
725 }
726 if (!head)
727 pr_cont(", bud of jhead %s",
728 dbg_jhead(bud->jhead));
729 }
730 }
731 if (lp->lnum == c->gc_lnum)
732 pr_cont(", GC LEB");
733 pr_cont(")\n");
734}
735
736void ubifs_dump_lprops(struct ubifs_info *c)
737{
738 int lnum, err;
739 struct ubifs_lprops lp;
740 struct ubifs_lp_stats lst;
741
742 pr_err("(pid %d) start dumping LEB properties\n", current->pid);
743 ubifs_get_lp_stats(c, &lst);
744 ubifs_dump_lstats(&lst);
745
746 for (lnum = c->main_first; lnum < c->leb_cnt; lnum++) {
747 err = ubifs_read_one_lp(c, lnum, &lp);
748 if (err)
749 ubifs_err("cannot read lprops for LEB %d", lnum);
750
751 ubifs_dump_lprop(c, &lp);
752 }
753 pr_err("(pid %d) finish dumping LEB properties\n", current->pid);
754}
755
756void ubifs_dump_lpt_info(struct ubifs_info *c)
757{
758 int i;
759
760 spin_lock(&dbg_lock);
761 pr_err("(pid %d) dumping LPT information\n", current->pid);
762 pr_err("\tlpt_sz: %lld\n", c->lpt_sz);
763 pr_err("\tpnode_sz: %d\n", c->pnode_sz);
764 pr_err("\tnnode_sz: %d\n", c->nnode_sz);
765 pr_err("\tltab_sz: %d\n", c->ltab_sz);
766 pr_err("\tlsave_sz: %d\n", c->lsave_sz);
767 pr_err("\tbig_lpt: %d\n", c->big_lpt);
768 pr_err("\tlpt_hght: %d\n", c->lpt_hght);
769 pr_err("\tpnode_cnt: %d\n", c->pnode_cnt);
770 pr_err("\tnnode_cnt: %d\n", c->nnode_cnt);
771 pr_err("\tdirty_pn_cnt: %d\n", c->dirty_pn_cnt);
772 pr_err("\tdirty_nn_cnt: %d\n", c->dirty_nn_cnt);
773 pr_err("\tlsave_cnt: %d\n", c->lsave_cnt);
774 pr_err("\tspace_bits: %d\n", c->space_bits);
775 pr_err("\tlpt_lnum_bits: %d\n", c->lpt_lnum_bits);
776 pr_err("\tlpt_offs_bits: %d\n", c->lpt_offs_bits);
777 pr_err("\tlpt_spc_bits: %d\n", c->lpt_spc_bits);
778 pr_err("\tpcnt_bits: %d\n", c->pcnt_bits);
779 pr_err("\tlnum_bits: %d\n", c->lnum_bits);
780 pr_err("\tLPT root is at %d:%d\n", c->lpt_lnum, c->lpt_offs);
781 pr_err("\tLPT head is at %d:%d\n",
782 c->nhead_lnum, c->nhead_offs);
783 pr_err("\tLPT ltab is at %d:%d\n", c->ltab_lnum, c->ltab_offs);
784 if (c->big_lpt)
785 pr_err("\tLPT lsave is at %d:%d\n",
786 c->lsave_lnum, c->lsave_offs);
787 for (i = 0; i < c->lpt_lebs; i++)
788 pr_err("\tLPT LEB %d free %d dirty %d tgc %d cmt %d\n",
789 i + c->lpt_first, c->ltab[i].free, c->ltab[i].dirty,
790 c->ltab[i].tgc, c->ltab[i].cmt);
791 spin_unlock(&dbg_lock);
792}
793
794void ubifs_dump_sleb(const struct ubifs_info *c,
795 const struct ubifs_scan_leb *sleb, int offs)
796{
797 struct ubifs_scan_node *snod;
798
799 pr_err("(pid %d) start dumping scanned data from LEB %d:%d\n",
800 current->pid, sleb->lnum, offs);
801
802 list_for_each_entry(snod, &sleb->nodes, list) {
803 cond_resched();
804 pr_err("Dumping node at LEB %d:%d len %d\n",
805 sleb->lnum, snod->offs, snod->len);
806 ubifs_dump_node(c, snod->node);
807 }
808}
809
810void ubifs_dump_leb(const struct ubifs_info *c, int lnum)
811{
812 struct ubifs_scan_leb *sleb;
813 struct ubifs_scan_node *snod;
814 void *buf;
815
816 pr_err("(pid %d) start dumping LEB %d\n", current->pid, lnum);
817
818 buf = __vmalloc(c->leb_size, GFP_NOFS, PAGE_KERNEL);
819 if (!buf) {
820 ubifs_err("cannot allocate memory for dumping LEB %d", lnum);
821 return;
822 }
823
824 sleb = ubifs_scan(c, lnum, 0, buf, 0);
825 if (IS_ERR(sleb)) {
826 ubifs_err("scan error %d", (int)PTR_ERR(sleb));
827 goto out;
828 }
829
830 pr_err("LEB %d has %d nodes ending at %d\n", lnum,
831 sleb->nodes_cnt, sleb->endpt);
832
833 list_for_each_entry(snod, &sleb->nodes, list) {
834 cond_resched();
835 pr_err("Dumping node at LEB %d:%d len %d\n", lnum,
836 snod->offs, snod->len);
837 ubifs_dump_node(c, snod->node);
838 }
839
840 pr_err("(pid %d) finish dumping LEB %d\n", current->pid, lnum);
841 ubifs_scan_destroy(sleb);
842
843out:
844 vfree(buf);
845 return;
846}
847
848void ubifs_dump_znode(const struct ubifs_info *c,
849 const struct ubifs_znode *znode)
850{
851 int n;
852 const struct ubifs_zbranch *zbr;
853 char key_buf[DBG_KEY_BUF_LEN];
854
855 spin_lock(&dbg_lock);
856 if (znode->parent)
857 zbr = &znode->parent->zbranch[znode->iip];
858 else
859 zbr = &c->zroot;
860
861 pr_err("znode %p, LEB %d:%d len %d parent %p iip %d level %d child_cnt %d flags %lx\n",
862 znode, zbr->lnum, zbr->offs, zbr->len, znode->parent, znode->iip,
863 znode->level, znode->child_cnt, znode->flags);
864
865 if (znode->child_cnt <= 0 || znode->child_cnt > c->fanout) {
866 spin_unlock(&dbg_lock);
867 return;
868 }
869
870 pr_err("zbranches:\n");
871 for (n = 0; n < znode->child_cnt; n++) {
872 zbr = &znode->zbranch[n];
873 if (znode->level > 0)
874 pr_err("\t%d: znode %p LEB %d:%d len %d key %s\n",
875 n, zbr->znode, zbr->lnum, zbr->offs, zbr->len,
876 dbg_snprintf_key(c, &zbr->key, key_buf,
877 DBG_KEY_BUF_LEN));
878 else
879 pr_err("\t%d: LNC %p LEB %d:%d len %d key %s\n",
880 n, zbr->znode, zbr->lnum, zbr->offs, zbr->len,
881 dbg_snprintf_key(c, &zbr->key, key_buf,
882 DBG_KEY_BUF_LEN));
883 }
884 spin_unlock(&dbg_lock);
885}
886
887void ubifs_dump_heap(struct ubifs_info *c, struct ubifs_lpt_heap *heap, int cat)
888{
889 int i;
890
891 pr_err("(pid %d) start dumping heap cat %d (%d elements)\n",
892 current->pid, cat, heap->cnt);
893 for (i = 0; i < heap->cnt; i++) {
894 struct ubifs_lprops *lprops = heap->arr[i];
895
896 pr_err("\t%d. LEB %d hpos %d free %d dirty %d flags %d\n",
897 i, lprops->lnum, lprops->hpos, lprops->free,
898 lprops->dirty, lprops->flags);
899 }
900 pr_err("(pid %d) finish dumping heap\n", current->pid);
901}
902
903void ubifs_dump_pnode(struct ubifs_info *c, struct ubifs_pnode *pnode,
904 struct ubifs_nnode *parent, int iip)
905{
906 int i;
907
908 pr_err("(pid %d) dumping pnode:\n", current->pid);
909 pr_err("\taddress %zx parent %zx cnext %zx\n",
910 (size_t)pnode, (size_t)parent, (size_t)pnode->cnext);
911 pr_err("\tflags %lu iip %d level %d num %d\n",
912 pnode->flags, iip, pnode->level, pnode->num);
913 for (i = 0; i < UBIFS_LPT_FANOUT; i++) {
914 struct ubifs_lprops *lp = &pnode->lprops[i];
915
916 pr_err("\t%d: free %d dirty %d flags %d lnum %d\n",
917 i, lp->free, lp->dirty, lp->flags, lp->lnum);
918 }
919}
920
921void ubifs_dump_tnc(struct ubifs_info *c)
922{
923 struct ubifs_znode *znode;
924 int level;
925
926 pr_err("\n");
927 pr_err("(pid %d) start dumping TNC tree\n", current->pid);
928 znode = ubifs_tnc_levelorder_next(c->zroot.znode, NULL);
929 level = znode->level;
930 pr_err("== Level %d ==\n", level);
931 while (znode) {
932 if (level != znode->level) {
933 level = znode->level;
934 pr_err("== Level %d ==\n", level);
935 }
936 ubifs_dump_znode(c, znode);
937 znode = ubifs_tnc_levelorder_next(c->zroot.znode, znode);
938 }
939 pr_err("(pid %d) finish dumping TNC tree\n", current->pid);
940}
941
942static int dump_znode(struct ubifs_info *c, struct ubifs_znode *znode,
943 void *priv)
944{
945 ubifs_dump_znode(c, znode);
946 return 0;
947}
948
949/**
950 * ubifs_dump_index - dump the on-flash index.
951 * @c: UBIFS file-system description object
952 *
953 * This function dumps whole UBIFS indexing B-tree, unlike 'ubifs_dump_tnc()'
954 * which dumps only in-memory znodes and does not read znodes which from flash.
955 */
956void ubifs_dump_index(struct ubifs_info *c)
957{
958 dbg_walk_index(c, NULL, dump_znode, NULL);
959}
960
961/**
962 * dbg_save_space_info - save information about flash space.
963 * @c: UBIFS file-system description object
964 *
965 * This function saves information about UBIFS free space, dirty space, etc, in
966 * order to check it later.
967 */
968void dbg_save_space_info(struct ubifs_info *c)
969{
970 struct ubifs_debug_info *d = c->dbg;
971 int freeable_cnt;
972
973 spin_lock(&c->space_lock);
974 memcpy(&d->saved_lst, &c->lst, sizeof(struct ubifs_lp_stats));
975 memcpy(&d->saved_bi, &c->bi, sizeof(struct ubifs_budg_info));
976 d->saved_idx_gc_cnt = c->idx_gc_cnt;
977
978 /*
979 * We use a dirty hack here and zero out @c->freeable_cnt, because it
980 * affects the free space calculations, and UBIFS might not know about
981 * all freeable eraseblocks. Indeed, we know about freeable eraseblocks
982 * only when we read their lprops, and we do this only lazily, upon the
983 * need. So at any given point of time @c->freeable_cnt might be not
984 * exactly accurate.
985 *
986 * Just one example about the issue we hit when we did not zero
987 * @c->freeable_cnt.
988 * 1. The file-system is mounted R/O, c->freeable_cnt is %0. We save the
989 * amount of free space in @d->saved_free
990 * 2. We re-mount R/W, which makes UBIFS to read the "lsave"
991 * information from flash, where we cache LEBs from various
992 * categories ('ubifs_remount_fs()' -> 'ubifs_lpt_init()'
993 * -> 'lpt_init_wr()' -> 'read_lsave()' -> 'ubifs_lpt_lookup()'
994 * -> 'ubifs_get_pnode()' -> 'update_cats()'
995 * -> 'ubifs_add_to_cat()').
996 * 3. Lsave contains a freeable eraseblock, and @c->freeable_cnt
997 * becomes %1.
998 * 4. We calculate the amount of free space when the re-mount is
999 * finished in 'dbg_check_space_info()' and it does not match
1000 * @d->saved_free.
1001 */
1002 freeable_cnt = c->freeable_cnt;
1003 c->freeable_cnt = 0;
1004 d->saved_free = ubifs_get_free_space_nolock(c);
1005 c->freeable_cnt = freeable_cnt;
1006 spin_unlock(&c->space_lock);
1007}
1008
1009/**
1010 * dbg_check_space_info - check flash space information.
1011 * @c: UBIFS file-system description object
1012 *
1013 * This function compares current flash space information with the information
1014 * which was saved when the 'dbg_save_space_info()' function was called.
1015 * Returns zero if the information has not changed, and %-EINVAL it it has
1016 * changed.
1017 */
1018int dbg_check_space_info(struct ubifs_info *c)
1019{
1020 struct ubifs_debug_info *d = c->dbg;
1021 struct ubifs_lp_stats lst;
1022 long long free;
1023 int freeable_cnt;
1024
1025 spin_lock(&c->space_lock);
1026 freeable_cnt = c->freeable_cnt;
1027 c->freeable_cnt = 0;
1028 free = ubifs_get_free_space_nolock(c);
1029 c->freeable_cnt = freeable_cnt;
1030 spin_unlock(&c->space_lock);
1031
1032 if (free != d->saved_free) {
1033 ubifs_err("free space changed from %lld to %lld",
1034 d->saved_free, free);
1035 goto out;
1036 }
1037
1038 return 0;
1039
1040out:
1041 ubifs_msg("saved lprops statistics dump");
1042 ubifs_dump_lstats(&d->saved_lst);
1043 ubifs_msg("saved budgeting info dump");
1044 ubifs_dump_budg(c, &d->saved_bi);
1045 ubifs_msg("saved idx_gc_cnt %d", d->saved_idx_gc_cnt);
1046 ubifs_msg("current lprops statistics dump");
1047 ubifs_get_lp_stats(c, &lst);
1048 ubifs_dump_lstats(&lst);
1049 ubifs_msg("current budgeting info dump");
1050 ubifs_dump_budg(c, &c->bi);
1051 dump_stack();
1052 return -EINVAL;
1053}
1054
1055/**
1056 * dbg_check_synced_i_size - check synchronized inode size.
1057 * @c: UBIFS file-system description object
1058 * @inode: inode to check
1059 *
1060 * If inode is clean, synchronized inode size has to be equivalent to current
1061 * inode size. This function has to be called only for locked inodes (@i_mutex
1062 * has to be locked). Returns %0 if synchronized inode size if correct, and
1063 * %-EINVAL if not.
1064 */
1065int dbg_check_synced_i_size(const struct ubifs_info *c, struct inode *inode)
1066{
1067 int err = 0;
1068 struct ubifs_inode *ui = ubifs_inode(inode);
1069
1070 if (!dbg_is_chk_gen(c))
1071 return 0;
1072 if (!S_ISREG(inode->i_mode))
1073 return 0;
1074
1075 mutex_lock(&ui->ui_mutex);
1076 spin_lock(&ui->ui_lock);
1077 if (ui->ui_size != ui->synced_i_size && !ui->dirty) {
1078 ubifs_err("ui_size is %lld, synced_i_size is %lld, but inode is clean",
1079 ui->ui_size, ui->synced_i_size);
1080 ubifs_err("i_ino %lu, i_mode %#x, i_size %lld", inode->i_ino,
1081 inode->i_mode, i_size_read(inode));
1082 dump_stack();
1083 err = -EINVAL;
1084 }
1085 spin_unlock(&ui->ui_lock);
1086 mutex_unlock(&ui->ui_mutex);
1087 return err;
1088}
1089
1090/*
1091 * dbg_check_dir - check directory inode size and link count.
1092 * @c: UBIFS file-system description object
1093 * @dir: the directory to calculate size for
1094 * @size: the result is returned here
1095 *
1096 * This function makes sure that directory size and link count are correct.
1097 * Returns zero in case of success and a negative error code in case of
1098 * failure.
1099 *
1100 * Note, it is good idea to make sure the @dir->i_mutex is locked before
1101 * calling this function.
1102 */
1103int dbg_check_dir(struct ubifs_info *c, const struct inode *dir)
1104{
1105 unsigned int nlink = 2;
1106 union ubifs_key key;
1107 struct ubifs_dent_node *dent, *pdent = NULL;
1108 struct qstr nm = { .name = NULL };
1109 loff_t size = UBIFS_INO_NODE_SZ;
1110
1111 if (!dbg_is_chk_gen(c))
1112 return 0;
1113
1114 if (!S_ISDIR(dir->i_mode))
1115 return 0;
1116
1117 lowest_dent_key(c, &key, dir->i_ino);
1118 while (1) {
1119 int err;
1120
1121 dent = ubifs_tnc_next_ent(c, &key, &nm);
1122 if (IS_ERR(dent)) {
1123 err = PTR_ERR(dent);
1124 if (err == -ENOENT)
1125 break;
1126 return err;
1127 }
1128
1129 nm.name = dent->name;
1130 nm.len = le16_to_cpu(dent->nlen);
1131 size += CALC_DENT_SIZE(nm.len);
1132 if (dent->type == UBIFS_ITYPE_DIR)
1133 nlink += 1;
1134 kfree(pdent);
1135 pdent = dent;
1136 key_read(c, &dent->key, &key);
1137 }
1138 kfree(pdent);
1139
1140 if (i_size_read(dir) != size) {
1141 ubifs_err("directory inode %lu has size %llu, but calculated size is %llu",
1142 dir->i_ino, (unsigned long long)i_size_read(dir),
1143 (unsigned long long)size);
1144 ubifs_dump_inode(c, dir);
1145 dump_stack();
1146 return -EINVAL;
1147 }
1148 if (dir->i_nlink != nlink) {
1149 ubifs_err("directory inode %lu has nlink %u, but calculated nlink is %u",
1150 dir->i_ino, dir->i_nlink, nlink);
1151 ubifs_dump_inode(c, dir);
1152 dump_stack();
1153 return -EINVAL;
1154 }
1155
1156 return 0;
1157}
1158
1159/**
1160 * dbg_check_key_order - make sure that colliding keys are properly ordered.
1161 * @c: UBIFS file-system description object
1162 * @zbr1: first zbranch
1163 * @zbr2: following zbranch
1164 *
1165 * In UBIFS indexing B-tree colliding keys has to be sorted in binary order of
1166 * names of the direntries/xentries which are referred by the keys. This
1167 * function reads direntries/xentries referred by @zbr1 and @zbr2 and makes
1168 * sure the name of direntry/xentry referred by @zbr1 is less than
1169 * direntry/xentry referred by @zbr2. Returns zero if this is true, %1 if not,
1170 * and a negative error code in case of failure.
1171 */
1172static int dbg_check_key_order(struct ubifs_info *c, struct ubifs_zbranch *zbr1,
1173 struct ubifs_zbranch *zbr2)
1174{
1175 int err, nlen1, nlen2, cmp;
1176 struct ubifs_dent_node *dent1, *dent2;
1177 union ubifs_key key;
1178 char key_buf[DBG_KEY_BUF_LEN];
1179
1180 ubifs_assert(!keys_cmp(c, &zbr1->key, &zbr2->key));
1181 dent1 = kmalloc(UBIFS_MAX_DENT_NODE_SZ, GFP_NOFS);
1182 if (!dent1)
1183 return -ENOMEM;
1184 dent2 = kmalloc(UBIFS_MAX_DENT_NODE_SZ, GFP_NOFS);
1185 if (!dent2) {
1186 err = -ENOMEM;
1187 goto out_free;
1188 }
1189
1190 err = ubifs_tnc_read_node(c, zbr1, dent1);
1191 if (err)
1192 goto out_free;
1193 err = ubifs_validate_entry(c, dent1);
1194 if (err)
1195 goto out_free;
1196
1197 err = ubifs_tnc_read_node(c, zbr2, dent2);
1198 if (err)
1199 goto out_free;
1200 err = ubifs_validate_entry(c, dent2);
1201 if (err)
1202 goto out_free;
1203
1204 /* Make sure node keys are the same as in zbranch */
1205 err = 1;
1206 key_read(c, &dent1->key, &key);
1207 if (keys_cmp(c, &zbr1->key, &key)) {
1208 ubifs_err("1st entry at %d:%d has key %s", zbr1->lnum,
1209 zbr1->offs, dbg_snprintf_key(c, &key, key_buf,
1210 DBG_KEY_BUF_LEN));
1211 ubifs_err("but it should have key %s according to tnc",
1212 dbg_snprintf_key(c, &zbr1->key, key_buf,
1213 DBG_KEY_BUF_LEN));
1214 ubifs_dump_node(c, dent1);
1215 goto out_free;
1216 }
1217
1218 key_read(c, &dent2->key, &key);
1219 if (keys_cmp(c, &zbr2->key, &key)) {
1220 ubifs_err("2nd entry at %d:%d has key %s", zbr1->lnum,
1221 zbr1->offs, dbg_snprintf_key(c, &key, key_buf,
1222 DBG_KEY_BUF_LEN));
1223 ubifs_err("but it should have key %s according to tnc",
1224 dbg_snprintf_key(c, &zbr2->key, key_buf,
1225 DBG_KEY_BUF_LEN));
1226 ubifs_dump_node(c, dent2);
1227 goto out_free;
1228 }
1229
1230 nlen1 = le16_to_cpu(dent1->nlen);
1231 nlen2 = le16_to_cpu(dent2->nlen);
1232
1233 cmp = memcmp(dent1->name, dent2->name, min_t(int, nlen1, nlen2));
1234 if (cmp < 0 || (cmp == 0 && nlen1 < nlen2)) {
1235 err = 0;
1236 goto out_free;
1237 }
1238 if (cmp == 0 && nlen1 == nlen2)
1239 ubifs_err("2 xent/dent nodes with the same name");
1240 else
1241 ubifs_err("bad order of colliding key %s",
1242 dbg_snprintf_key(c, &key, key_buf, DBG_KEY_BUF_LEN));
1243
1244 ubifs_msg("first node at %d:%d\n", zbr1->lnum, zbr1->offs);
1245 ubifs_dump_node(c, dent1);
1246 ubifs_msg("second node at %d:%d\n", zbr2->lnum, zbr2->offs);
1247 ubifs_dump_node(c, dent2);
1248
1249out_free:
1250 kfree(dent2);
1251 kfree(dent1);
1252 return err;
1253}
1254
1255/**
1256 * dbg_check_znode - check if znode is all right.
1257 * @c: UBIFS file-system description object
1258 * @zbr: zbranch which points to this znode
1259 *
1260 * This function makes sure that znode referred to by @zbr is all right.
1261 * Returns zero if it is, and %-EINVAL if it is not.
1262 */
1263static int dbg_check_znode(struct ubifs_info *c, struct ubifs_zbranch *zbr)
1264{
1265 struct ubifs_znode *znode = zbr->znode;
1266 struct ubifs_znode *zp = znode->parent;
1267 int n, err, cmp;
1268
1269 if (znode->child_cnt <= 0 || znode->child_cnt > c->fanout) {
1270 err = 1;
1271 goto out;
1272 }
1273 if (znode->level < 0) {
1274 err = 2;
1275 goto out;
1276 }
1277 if (znode->iip < 0 || znode->iip >= c->fanout) {
1278 err = 3;
1279 goto out;
1280 }
1281
1282 if (zbr->len == 0)
1283 /* Only dirty zbranch may have no on-flash nodes */
1284 if (!ubifs_zn_dirty(znode)) {
1285 err = 4;
1286 goto out;
1287 }
1288
1289 if (ubifs_zn_dirty(znode)) {
1290 /*
1291 * If znode is dirty, its parent has to be dirty as well. The
1292 * order of the operation is important, so we have to have
1293 * memory barriers.
1294 */
1295 smp_mb();
1296 if (zp && !ubifs_zn_dirty(zp)) {
1297 /*
1298 * The dirty flag is atomic and is cleared outside the
1299 * TNC mutex, so znode's dirty flag may now have
1300 * been cleared. The child is always cleared before the
1301 * parent, so we just need to check again.
1302 */
1303 smp_mb();
1304 if (ubifs_zn_dirty(znode)) {
1305 err = 5;
1306 goto out;
1307 }
1308 }
1309 }
1310
1311 if (zp) {
1312 const union ubifs_key *min, *max;
1313
1314 if (znode->level != zp->level - 1) {
1315 err = 6;
1316 goto out;
1317 }
1318
1319 /* Make sure the 'parent' pointer in our znode is correct */
1320 err = ubifs_search_zbranch(c, zp, &zbr->key, &n);
1321 if (!err) {
1322 /* This zbranch does not exist in the parent */
1323 err = 7;
1324 goto out;
1325 }
1326
1327 if (znode->iip >= zp->child_cnt) {
1328 err = 8;
1329 goto out;
1330 }
1331
1332 if (znode->iip != n) {
1333 /* This may happen only in case of collisions */
1334 if (keys_cmp(c, &zp->zbranch[n].key,
1335 &zp->zbranch[znode->iip].key)) {
1336 err = 9;
1337 goto out;
1338 }
1339 n = znode->iip;
1340 }
1341
1342 /*
1343 * Make sure that the first key in our znode is greater than or
1344 * equal to the key in the pointing zbranch.
1345 */
1346 min = &zbr->key;
1347 cmp = keys_cmp(c, min, &znode->zbranch[0].key);
1348 if (cmp == 1) {
1349 err = 10;
1350 goto out;
1351 }
1352
1353 if (n + 1 < zp->child_cnt) {
1354 max = &zp->zbranch[n + 1].key;
1355
1356 /*
1357 * Make sure the last key in our znode is less or
1358 * equivalent than the key in the zbranch which goes
1359 * after our pointing zbranch.
1360 */
1361 cmp = keys_cmp(c, max,
1362 &znode->zbranch[znode->child_cnt - 1].key);
1363 if (cmp == -1) {
1364 err = 11;
1365 goto out;
1366 }
1367 }
1368 } else {
1369 /* This may only be root znode */
1370 if (zbr != &c->zroot) {
1371 err = 12;
1372 goto out;
1373 }
1374 }
1375
1376 /*
1377 * Make sure that next key is greater or equivalent then the previous
1378 * one.
1379 */
1380 for (n = 1; n < znode->child_cnt; n++) {
1381 cmp = keys_cmp(c, &znode->zbranch[n - 1].key,
1382 &znode->zbranch[n].key);
1383 if (cmp > 0) {
1384 err = 13;
1385 goto out;
1386 }
1387 if (cmp == 0) {
1388 /* This can only be keys with colliding hash */
1389 if (!is_hash_key(c, &znode->zbranch[n].key)) {
1390 err = 14;
1391 goto out;
1392 }
1393
1394 if (znode->level != 0 || c->replaying)
1395 continue;
1396
1397 /*
1398 * Colliding keys should follow binary order of
1399 * corresponding xentry/dentry names.
1400 */
1401 err = dbg_check_key_order(c, &znode->zbranch[n - 1],
1402 &znode->zbranch[n]);
1403 if (err < 0)
1404 return err;
1405 if (err) {
1406 err = 15;
1407 goto out;
1408 }
1409 }
1410 }
1411
1412 for (n = 0; n < znode->child_cnt; n++) {
1413 if (!znode->zbranch[n].znode &&
1414 (znode->zbranch[n].lnum == 0 ||
1415 znode->zbranch[n].len == 0)) {
1416 err = 16;
1417 goto out;
1418 }
1419
1420 if (znode->zbranch[n].lnum != 0 &&
1421 znode->zbranch[n].len == 0) {
1422 err = 17;
1423 goto out;
1424 }
1425
1426 if (znode->zbranch[n].lnum == 0 &&
1427 znode->zbranch[n].len != 0) {
1428 err = 18;
1429 goto out;
1430 }
1431
1432 if (znode->zbranch[n].lnum == 0 &&
1433 znode->zbranch[n].offs != 0) {
1434 err = 19;
1435 goto out;
1436 }
1437
1438 if (znode->level != 0 && znode->zbranch[n].znode)
1439 if (znode->zbranch[n].znode->parent != znode) {
1440 err = 20;
1441 goto out;
1442 }
1443 }
1444
1445 return 0;
1446
1447out:
1448 ubifs_err("failed, error %d", err);
1449 ubifs_msg("dump of the znode");
1450 ubifs_dump_znode(c, znode);
1451 if (zp) {
1452 ubifs_msg("dump of the parent znode");
1453 ubifs_dump_znode(c, zp);
1454 }
1455 dump_stack();
1456 return -EINVAL;
1457}
1458
1459/**
1460 * dbg_check_tnc - check TNC tree.
1461 * @c: UBIFS file-system description object
1462 * @extra: do extra checks that are possible at start commit
1463 *
1464 * This function traverses whole TNC tree and checks every znode. Returns zero
1465 * if everything is all right and %-EINVAL if something is wrong with TNC.
1466 */
1467int dbg_check_tnc(struct ubifs_info *c, int extra)
1468{
1469 struct ubifs_znode *znode;
1470 long clean_cnt = 0, dirty_cnt = 0;
1471 int err, last;
1472
1473 if (!dbg_is_chk_index(c))
1474 return 0;
1475
1476 ubifs_assert(mutex_is_locked(&c->tnc_mutex));
1477 if (!c->zroot.znode)
1478 return 0;
1479
1480 znode = ubifs_tnc_postorder_first(c->zroot.znode);
1481 while (1) {
1482 struct ubifs_znode *prev;
1483 struct ubifs_zbranch *zbr;
1484
1485 if (!znode->parent)
1486 zbr = &c->zroot;
1487 else
1488 zbr = &znode->parent->zbranch[znode->iip];
1489
1490 err = dbg_check_znode(c, zbr);
1491 if (err)
1492 return err;
1493
1494 if (extra) {
1495 if (ubifs_zn_dirty(znode))
1496 dirty_cnt += 1;
1497 else
1498 clean_cnt += 1;
1499 }
1500
1501 prev = znode;
1502 znode = ubifs_tnc_postorder_next(znode);
1503 if (!znode)
1504 break;
1505
1506 /*
1507 * If the last key of this znode is equivalent to the first key
1508 * of the next znode (collision), then check order of the keys.
1509 */
1510 last = prev->child_cnt - 1;
1511 if (prev->level == 0 && znode->level == 0 && !c->replaying &&
1512 !keys_cmp(c, &prev->zbranch[last].key,
1513 &znode->zbranch[0].key)) {
1514 err = dbg_check_key_order(c, &prev->zbranch[last],
1515 &znode->zbranch[0]);
1516 if (err < 0)
1517 return err;
1518 if (err) {
1519 ubifs_msg("first znode");
1520 ubifs_dump_znode(c, prev);
1521 ubifs_msg("second znode");
1522 ubifs_dump_znode(c, znode);
1523 return -EINVAL;
1524 }
1525 }
1526 }
1527
1528 if (extra) {
1529 if (clean_cnt != atomic_long_read(&c->clean_zn_cnt)) {
1530 ubifs_err("incorrect clean_zn_cnt %ld, calculated %ld",
1531 atomic_long_read(&c->clean_zn_cnt),
1532 clean_cnt);
1533 return -EINVAL;
1534 }
1535 if (dirty_cnt != atomic_long_read(&c->dirty_zn_cnt)) {
1536 ubifs_err("incorrect dirty_zn_cnt %ld, calculated %ld",
1537 atomic_long_read(&c->dirty_zn_cnt),
1538 dirty_cnt);
1539 return -EINVAL;
1540 }
1541 }
1542
1543 return 0;
1544}
1545
1546/**
1547 * dbg_walk_index - walk the on-flash index.
1548 * @c: UBIFS file-system description object
1549 * @leaf_cb: called for each leaf node
1550 * @znode_cb: called for each indexing node
1551 * @priv: private data which is passed to callbacks
1552 *
1553 * This function walks the UBIFS index and calls the @leaf_cb for each leaf
1554 * node and @znode_cb for each indexing node. Returns zero in case of success
1555 * and a negative error code in case of failure.
1556 *
1557 * It would be better if this function removed every znode it pulled to into
1558 * the TNC, so that the behavior more closely matched the non-debugging
1559 * behavior.
1560 */
1561int dbg_walk_index(struct ubifs_info *c, dbg_leaf_callback leaf_cb,
1562 dbg_znode_callback znode_cb, void *priv)
1563{
1564 int err;
1565 struct ubifs_zbranch *zbr;
1566 struct ubifs_znode *znode, *child;
1567
1568 mutex_lock(&c->tnc_mutex);
1569 /* If the root indexing node is not in TNC - pull it */
1570 if (!c->zroot.znode) {
1571 c->zroot.znode = ubifs_load_znode(c, &c->zroot, NULL, 0);
1572 if (IS_ERR(c->zroot.znode)) {
1573 err = PTR_ERR(c->zroot.znode);
1574 c->zroot.znode = NULL;
1575 goto out_unlock;
1576 }
1577 }
1578
1579 /*
1580 * We are going to traverse the indexing tree in the postorder manner.
1581 * Go down and find the leftmost indexing node where we are going to
1582 * start from.
1583 */
1584 znode = c->zroot.znode;
1585 while (znode->level > 0) {
1586 zbr = &znode->zbranch[0];
1587 child = zbr->znode;
1588 if (!child) {
1589 child = ubifs_load_znode(c, zbr, znode, 0);
1590 if (IS_ERR(child)) {
1591 err = PTR_ERR(child);
1592 goto out_unlock;
1593 }
1594 zbr->znode = child;
1595 }
1596
1597 znode = child;
1598 }
1599
1600 /* Iterate over all indexing nodes */
1601 while (1) {
1602 int idx;
1603
1604 cond_resched();
1605
1606 if (znode_cb) {
1607 err = znode_cb(c, znode, priv);
1608 if (err) {
1609 ubifs_err("znode checking function returned error %d",
1610 err);
1611 ubifs_dump_znode(c, znode);
1612 goto out_dump;
1613 }
1614 }
1615 if (leaf_cb && znode->level == 0) {
1616 for (idx = 0; idx < znode->child_cnt; idx++) {
1617 zbr = &znode->zbranch[idx];
1618 err = leaf_cb(c, zbr, priv);
1619 if (err) {
1620 ubifs_err("leaf checking function returned error %d, for leaf at LEB %d:%d",
1621 err, zbr->lnum, zbr->offs);
1622 goto out_dump;
1623 }
1624 }
1625 }
1626
1627 if (!znode->parent)
1628 break;
1629
1630 idx = znode->iip + 1;
1631 znode = znode->parent;
1632 if (idx < znode->child_cnt) {
1633 /* Switch to the next index in the parent */
1634 zbr = &znode->zbranch[idx];
1635 child = zbr->znode;
1636 if (!child) {
1637 child = ubifs_load_znode(c, zbr, znode, idx);
1638 if (IS_ERR(child)) {
1639 err = PTR_ERR(child);
1640 goto out_unlock;
1641 }
1642 zbr->znode = child;
1643 }
1644 znode = child;
1645 } else
1646 /*
1647 * This is the last child, switch to the parent and
1648 * continue.
1649 */
1650 continue;
1651
1652 /* Go to the lowest leftmost znode in the new sub-tree */
1653 while (znode->level > 0) {
1654 zbr = &znode->zbranch[0];
1655 child = zbr->znode;
1656 if (!child) {
1657 child = ubifs_load_znode(c, zbr, znode, 0);
1658 if (IS_ERR(child)) {
1659 err = PTR_ERR(child);
1660 goto out_unlock;
1661 }
1662 zbr->znode = child;
1663 }
1664 znode = child;
1665 }
1666 }
1667
1668 mutex_unlock(&c->tnc_mutex);
1669 return 0;
1670
1671out_dump:
1672 if (znode->parent)
1673 zbr = &znode->parent->zbranch[znode->iip];
1674 else
1675 zbr = &c->zroot;
1676 ubifs_msg("dump of znode at LEB %d:%d", zbr->lnum, zbr->offs);
1677 ubifs_dump_znode(c, znode);
1678out_unlock:
1679 mutex_unlock(&c->tnc_mutex);
1680 return err;
1681}
1682
1683/**
1684 * add_size - add znode size to partially calculated index size.
1685 * @c: UBIFS file-system description object
1686 * @znode: znode to add size for
1687 * @priv: partially calculated index size
1688 *
1689 * This is a helper function for 'dbg_check_idx_size()' which is called for
1690 * every indexing node and adds its size to the 'long long' variable pointed to
1691 * by @priv.
1692 */
1693static int add_size(struct ubifs_info *c, struct ubifs_znode *znode, void *priv)
1694{
1695 long long *idx_size = priv;
1696 int add;
1697
1698 add = ubifs_idx_node_sz(c, znode->child_cnt);
1699 add = ALIGN(add, 8);
1700 *idx_size += add;
1701 return 0;
1702}
1703
1704/**
1705 * dbg_check_idx_size - check index size.
1706 * @c: UBIFS file-system description object
1707 * @idx_size: size to check
1708 *
1709 * This function walks the UBIFS index, calculates its size and checks that the
1710 * size is equivalent to @idx_size. Returns zero in case of success and a
1711 * negative error code in case of failure.
1712 */
1713int dbg_check_idx_size(struct ubifs_info *c, long long idx_size)
1714{
1715 int err;
1716 long long calc = 0;
1717
1718 if (!dbg_is_chk_index(c))
1719 return 0;
1720
1721 err = dbg_walk_index(c, NULL, add_size, &calc);
1722 if (err) {
1723 ubifs_err("error %d while walking the index", err);
1724 return err;
1725 }
1726
1727 if (calc != idx_size) {
1728 ubifs_err("index size check failed: calculated size is %lld, should be %lld",
1729 calc, idx_size);
1730 dump_stack();
1731 return -EINVAL;
1732 }
1733
1734 return 0;
1735}
1736
1737/**
1738 * struct fsck_inode - information about an inode used when checking the file-system.
1739 * @rb: link in the RB-tree of inodes
1740 * @inum: inode number
1741 * @mode: inode type, permissions, etc
1742 * @nlink: inode link count
1743 * @xattr_cnt: count of extended attributes
1744 * @references: how many directory/xattr entries refer this inode (calculated
1745 * while walking the index)
1746 * @calc_cnt: for directory inode count of child directories
1747 * @size: inode size (read from on-flash inode)
1748 * @xattr_sz: summary size of all extended attributes (read from on-flash
1749 * inode)
1750 * @calc_sz: for directories calculated directory size
1751 * @calc_xcnt: count of extended attributes
1752 * @calc_xsz: calculated summary size of all extended attributes
1753 * @xattr_nms: sum of lengths of all extended attribute names belonging to this
1754 * inode (read from on-flash inode)
1755 * @calc_xnms: calculated sum of lengths of all extended attribute names
1756 */
1757struct fsck_inode {
1758 struct rb_node rb;
1759 ino_t inum;
1760 umode_t mode;
1761 unsigned int nlink;
1762 unsigned int xattr_cnt;
1763 int references;
1764 int calc_cnt;
1765 long long size;
1766 unsigned int xattr_sz;
1767 long long calc_sz;
1768 long long calc_xcnt;
1769 long long calc_xsz;
1770 unsigned int xattr_nms;
1771 long long calc_xnms;
1772};
1773
1774/**
1775 * struct fsck_data - private FS checking information.
1776 * @inodes: RB-tree of all inodes (contains @struct fsck_inode objects)
1777 */
1778struct fsck_data {
1779 struct rb_root inodes;
1780};
1781
1782/**
1783 * add_inode - add inode information to RB-tree of inodes.
1784 * @c: UBIFS file-system description object
1785 * @fsckd: FS checking information
1786 * @ino: raw UBIFS inode to add
1787 *
1788 * This is a helper function for 'check_leaf()' which adds information about
1789 * inode @ino to the RB-tree of inodes. Returns inode information pointer in
1790 * case of success and a negative error code in case of failure.
1791 */
1792static struct fsck_inode *add_inode(struct ubifs_info *c,
1793 struct fsck_data *fsckd,
1794 struct ubifs_ino_node *ino)
1795{
1796 struct rb_node **p, *parent = NULL;
1797 struct fsck_inode *fscki;
1798 ino_t inum = key_inum_flash(c, &ino->key);
1799 struct inode *inode;
1800 struct ubifs_inode *ui;
1801
1802 p = &fsckd->inodes.rb_node;
1803 while (*p) {
1804 parent = *p;
1805 fscki = rb_entry(parent, struct fsck_inode, rb);
1806 if (inum < fscki->inum)
1807 p = &(*p)->rb_left;
1808 else if (inum > fscki->inum)
1809 p = &(*p)->rb_right;
1810 else
1811 return fscki;
1812 }
1813
1814 if (inum > c->highest_inum) {
1815 ubifs_err("too high inode number, max. is %lu",
1816 (unsigned long)c->highest_inum);
1817 return ERR_PTR(-EINVAL);
1818 }
1819
1820 fscki = kzalloc(sizeof(struct fsck_inode), GFP_NOFS);
1821 if (!fscki)
1822 return ERR_PTR(-ENOMEM);
1823
1824 inode = ilookup(c->vfs_sb, inum);
1825
1826 fscki->inum = inum;
1827 /*
1828 * If the inode is present in the VFS inode cache, use it instead of
1829 * the on-flash inode which might be out-of-date. E.g., the size might
1830 * be out-of-date. If we do not do this, the following may happen, for
1831 * example:
1832 * 1. A power cut happens
1833 * 2. We mount the file-system R/O, the replay process fixes up the
1834 * inode size in the VFS cache, but on on-flash.
1835 * 3. 'check_leaf()' fails because it hits a data node beyond inode
1836 * size.
1837 */
1838 if (!inode) {
1839 fscki->nlink = le32_to_cpu(ino->nlink);
1840 fscki->size = le64_to_cpu(ino->size);
1841 fscki->xattr_cnt = le32_to_cpu(ino->xattr_cnt);
1842 fscki->xattr_sz = le32_to_cpu(ino->xattr_size);
1843 fscki->xattr_nms = le32_to_cpu(ino->xattr_names);
1844 fscki->mode = le32_to_cpu(ino->mode);
1845 } else {
1846 ui = ubifs_inode(inode);
1847 fscki->nlink = inode->i_nlink;
1848 fscki->size = inode->i_size;
1849 fscki->xattr_cnt = ui->xattr_cnt;
1850 fscki->xattr_sz = ui->xattr_size;
1851 fscki->xattr_nms = ui->xattr_names;
1852 fscki->mode = inode->i_mode;
1853 iput(inode);
1854 }
1855
1856 if (S_ISDIR(fscki->mode)) {
1857 fscki->calc_sz = UBIFS_INO_NODE_SZ;
1858 fscki->calc_cnt = 2;
1859 }
1860
1861 rb_link_node(&fscki->rb, parent, p);
1862 rb_insert_color(&fscki->rb, &fsckd->inodes);
1863
1864 return fscki;
1865}
1866
1867/**
1868 * search_inode - search inode in the RB-tree of inodes.
1869 * @fsckd: FS checking information
1870 * @inum: inode number to search
1871 *
1872 * This is a helper function for 'check_leaf()' which searches inode @inum in
1873 * the RB-tree of inodes and returns an inode information pointer or %NULL if
1874 * the inode was not found.
1875 */
1876static struct fsck_inode *search_inode(struct fsck_data *fsckd, ino_t inum)
1877{
1878 struct rb_node *p;
1879 struct fsck_inode *fscki;
1880
1881 p = fsckd->inodes.rb_node;
1882 while (p) {
1883 fscki = rb_entry(p, struct fsck_inode, rb);
1884 if (inum < fscki->inum)
1885 p = p->rb_left;
1886 else if (inum > fscki->inum)
1887 p = p->rb_right;
1888 else
1889 return fscki;
1890 }
1891 return NULL;
1892}
1893
1894/**
1895 * read_add_inode - read inode node and add it to RB-tree of inodes.
1896 * @c: UBIFS file-system description object
1897 * @fsckd: FS checking information
1898 * @inum: inode number to read
1899 *
1900 * This is a helper function for 'check_leaf()' which finds inode node @inum in
1901 * the index, reads it, and adds it to the RB-tree of inodes. Returns inode
1902 * information pointer in case of success and a negative error code in case of
1903 * failure.
1904 */
1905static struct fsck_inode *read_add_inode(struct ubifs_info *c,
1906 struct fsck_data *fsckd, ino_t inum)
1907{
1908 int n, err;
1909 union ubifs_key key;
1910 struct ubifs_znode *znode;
1911 struct ubifs_zbranch *zbr;
1912 struct ubifs_ino_node *ino;
1913 struct fsck_inode *fscki;
1914
1915 fscki = search_inode(fsckd, inum);
1916 if (fscki)
1917 return fscki;
1918
1919 ino_key_init(c, &key, inum);
1920 err = ubifs_lookup_level0(c, &key, &znode, &n);
1921 if (!err) {
1922 ubifs_err("inode %lu not found in index", (unsigned long)inum);
1923 return ERR_PTR(-ENOENT);
1924 } else if (err < 0) {
1925 ubifs_err("error %d while looking up inode %lu",
1926 err, (unsigned long)inum);
1927 return ERR_PTR(err);
1928 }
1929
1930 zbr = &znode->zbranch[n];
1931 if (zbr->len < UBIFS_INO_NODE_SZ) {
1932 ubifs_err("bad node %lu node length %d",
1933 (unsigned long)inum, zbr->len);
1934 return ERR_PTR(-EINVAL);
1935 }
1936
1937 ino = kmalloc(zbr->len, GFP_NOFS);
1938 if (!ino)
1939 return ERR_PTR(-ENOMEM);
1940
1941 err = ubifs_tnc_read_node(c, zbr, ino);
1942 if (err) {
1943 ubifs_err("cannot read inode node at LEB %d:%d, error %d",
1944 zbr->lnum, zbr->offs, err);
1945 kfree(ino);
1946 return ERR_PTR(err);
1947 }
1948
1949 fscki = add_inode(c, fsckd, ino);
1950 kfree(ino);
1951 if (IS_ERR(fscki)) {
1952 ubifs_err("error %ld while adding inode %lu node",
1953 PTR_ERR(fscki), (unsigned long)inum);
1954 return fscki;
1955 }
1956
1957 return fscki;
1958}
1959
1960/**
1961 * check_leaf - check leaf node.
1962 * @c: UBIFS file-system description object
1963 * @zbr: zbranch of the leaf node to check
1964 * @priv: FS checking information
1965 *
1966 * This is a helper function for 'dbg_check_filesystem()' which is called for
1967 * every single leaf node while walking the indexing tree. It checks that the
1968 * leaf node referred from the indexing tree exists, has correct CRC, and does
1969 * some other basic validation. This function is also responsible for building
1970 * an RB-tree of inodes - it adds all inodes into the RB-tree. It also
1971 * calculates reference count, size, etc for each inode in order to later
1972 * compare them to the information stored inside the inodes and detect possible
1973 * inconsistencies. Returns zero in case of success and a negative error code
1974 * in case of failure.
1975 */
1976static int check_leaf(struct ubifs_info *c, struct ubifs_zbranch *zbr,
1977 void *priv)
1978{
1979 ino_t inum;
1980 void *node;
1981 struct ubifs_ch *ch;
1982 int err, type = key_type(c, &zbr->key);
1983 struct fsck_inode *fscki;
1984
1985 if (zbr->len < UBIFS_CH_SZ) {
1986 ubifs_err("bad leaf length %d (LEB %d:%d)",
1987 zbr->len, zbr->lnum, zbr->offs);
1988 return -EINVAL;
1989 }
1990
1991 node = kmalloc(zbr->len, GFP_NOFS);
1992 if (!node)
1993 return -ENOMEM;
1994
1995 err = ubifs_tnc_read_node(c, zbr, node);
1996 if (err) {
1997 ubifs_err("cannot read leaf node at LEB %d:%d, error %d",
1998 zbr->lnum, zbr->offs, err);
1999 goto out_free;
2000 }
2001
2002 /* If this is an inode node, add it to RB-tree of inodes */
2003 if (type == UBIFS_INO_KEY) {
2004 fscki = add_inode(c, priv, node);
2005 if (IS_ERR(fscki)) {
2006 err = PTR_ERR(fscki);
2007 ubifs_err("error %d while adding inode node", err);
2008 goto out_dump;
2009 }
2010 goto out;
2011 }
2012
2013 if (type != UBIFS_DENT_KEY && type != UBIFS_XENT_KEY &&
2014 type != UBIFS_DATA_KEY) {
2015 ubifs_err("unexpected node type %d at LEB %d:%d",
2016 type, zbr->lnum, zbr->offs);
2017 err = -EINVAL;
2018 goto out_free;
2019 }
2020
2021 ch = node;
2022 if (le64_to_cpu(ch->sqnum) > c->max_sqnum) {
2023 ubifs_err("too high sequence number, max. is %llu",
2024 c->max_sqnum);
2025 err = -EINVAL;
2026 goto out_dump;
2027 }
2028
2029 if (type == UBIFS_DATA_KEY) {
2030 long long blk_offs;
2031 struct ubifs_data_node *dn = node;
2032
2033 /*
2034 * Search the inode node this data node belongs to and insert
2035 * it to the RB-tree of inodes.
2036 */
2037 inum = key_inum_flash(c, &dn->key);
2038 fscki = read_add_inode(c, priv, inum);
2039 if (IS_ERR(fscki)) {
2040 err = PTR_ERR(fscki);
2041 ubifs_err("error %d while processing data node and trying to find inode node %lu",
2042 err, (unsigned long)inum);
2043 goto out_dump;
2044 }
2045
2046 /* Make sure the data node is within inode size */
2047 blk_offs = key_block_flash(c, &dn->key);
2048 blk_offs <<= UBIFS_BLOCK_SHIFT;
2049 blk_offs += le32_to_cpu(dn->size);
2050 if (blk_offs > fscki->size) {
2051 ubifs_err("data node at LEB %d:%d is not within inode size %lld",
2052 zbr->lnum, zbr->offs, fscki->size);
2053 err = -EINVAL;
2054 goto out_dump;
2055 }
2056 } else {
2057 int nlen;
2058 struct ubifs_dent_node *dent = node;
2059 struct fsck_inode *fscki1;
2060
2061 err = ubifs_validate_entry(c, dent);
2062 if (err)
2063 goto out_dump;
2064
2065 /*
2066 * Search the inode node this entry refers to and the parent
2067 * inode node and insert them to the RB-tree of inodes.
2068 */
2069 inum = le64_to_cpu(dent->inum);
2070 fscki = read_add_inode(c, priv, inum);
2071 if (IS_ERR(fscki)) {
2072 err = PTR_ERR(fscki);
2073 ubifs_err("error %d while processing entry node and trying to find inode node %lu",
2074 err, (unsigned long)inum);
2075 goto out_dump;
2076 }
2077
2078 /* Count how many direntries or xentries refers this inode */
2079 fscki->references += 1;
2080
2081 inum = key_inum_flash(c, &dent->key);
2082 fscki1 = read_add_inode(c, priv, inum);
2083 if (IS_ERR(fscki1)) {
2084 err = PTR_ERR(fscki1);
2085 ubifs_err("error %d while processing entry node and trying to find parent inode node %lu",
2086 err, (unsigned long)inum);
2087 goto out_dump;
2088 }
2089
2090 nlen = le16_to_cpu(dent->nlen);
2091 if (type == UBIFS_XENT_KEY) {
2092 fscki1->calc_xcnt += 1;
2093 fscki1->calc_xsz += CALC_DENT_SIZE(nlen);
2094 fscki1->calc_xsz += CALC_XATTR_BYTES(fscki->size);
2095 fscki1->calc_xnms += nlen;
2096 } else {
2097 fscki1->calc_sz += CALC_DENT_SIZE(nlen);
2098 if (dent->type == UBIFS_ITYPE_DIR)
2099 fscki1->calc_cnt += 1;
2100 }
2101 }
2102
2103out:
2104 kfree(node);
2105 return 0;
2106
2107out_dump:
2108 ubifs_msg("dump of node at LEB %d:%d", zbr->lnum, zbr->offs);
2109 ubifs_dump_node(c, node);
2110out_free:
2111 kfree(node);
2112 return err;
2113}
2114
2115/**
2116 * free_inodes - free RB-tree of inodes.
2117 * @fsckd: FS checking information
2118 */
2119static void free_inodes(struct fsck_data *fsckd)
2120{
2121 struct fsck_inode *fscki, *n;
2122
2123 rbtree_postorder_for_each_entry_safe(fscki, n, &fsckd->inodes, rb)
2124 kfree(fscki);
2125}
2126
2127/**
2128 * check_inodes - checks all inodes.
2129 * @c: UBIFS file-system description object
2130 * @fsckd: FS checking information
2131 *
2132 * This is a helper function for 'dbg_check_filesystem()' which walks the
2133 * RB-tree of inodes after the index scan has been finished, and checks that
2134 * inode nlink, size, etc are correct. Returns zero if inodes are fine,
2135 * %-EINVAL if not, and a negative error code in case of failure.
2136 */
2137static int check_inodes(struct ubifs_info *c, struct fsck_data *fsckd)
2138{
2139 int n, err;
2140 union ubifs_key key;
2141 struct ubifs_znode *znode;
2142 struct ubifs_zbranch *zbr;
2143 struct ubifs_ino_node *ino;
2144 struct fsck_inode *fscki;
2145 struct rb_node *this = rb_first(&fsckd->inodes);
2146
2147 while (this) {
2148 fscki = rb_entry(this, struct fsck_inode, rb);
2149 this = rb_next(this);
2150
2151 if (S_ISDIR(fscki->mode)) {
2152 /*
2153 * Directories have to have exactly one reference (they
2154 * cannot have hardlinks), although root inode is an
2155 * exception.
2156 */
2157 if (fscki->inum != UBIFS_ROOT_INO &&
2158 fscki->references != 1) {
2159 ubifs_err("directory inode %lu has %d direntries which refer it, but should be 1",
2160 (unsigned long)fscki->inum,
2161 fscki->references);
2162 goto out_dump;
2163 }
2164 if (fscki->inum == UBIFS_ROOT_INO &&
2165 fscki->references != 0) {
2166 ubifs_err("root inode %lu has non-zero (%d) direntries which refer it",
2167 (unsigned long)fscki->inum,
2168 fscki->references);
2169 goto out_dump;
2170 }
2171 if (fscki->calc_sz != fscki->size) {
2172 ubifs_err("directory inode %lu size is %lld, but calculated size is %lld",
2173 (unsigned long)fscki->inum,
2174 fscki->size, fscki->calc_sz);
2175 goto out_dump;
2176 }
2177 if (fscki->calc_cnt != fscki->nlink) {
2178 ubifs_err("directory inode %lu nlink is %d, but calculated nlink is %d",
2179 (unsigned long)fscki->inum,
2180 fscki->nlink, fscki->calc_cnt);
2181 goto out_dump;
2182 }
2183 } else {
2184 if (fscki->references != fscki->nlink) {
2185 ubifs_err("inode %lu nlink is %d, but calculated nlink is %d",
2186 (unsigned long)fscki->inum,
2187 fscki->nlink, fscki->references);
2188 goto out_dump;
2189 }
2190 }
2191 if (fscki->xattr_sz != fscki->calc_xsz) {
2192 ubifs_err("inode %lu has xattr size %u, but calculated size is %lld",
2193 (unsigned long)fscki->inum, fscki->xattr_sz,
2194 fscki->calc_xsz);
2195 goto out_dump;
2196 }
2197 if (fscki->xattr_cnt != fscki->calc_xcnt) {
2198 ubifs_err("inode %lu has %u xattrs, but calculated count is %lld",
2199 (unsigned long)fscki->inum,
2200 fscki->xattr_cnt, fscki->calc_xcnt);
2201 goto out_dump;
2202 }
2203 if (fscki->xattr_nms != fscki->calc_xnms) {
2204 ubifs_err("inode %lu has xattr names' size %u, but calculated names' size is %lld",
2205 (unsigned long)fscki->inum, fscki->xattr_nms,
2206 fscki->calc_xnms);
2207 goto out_dump;
2208 }
2209 }
2210
2211 return 0;
2212
2213out_dump:
2214 /* Read the bad inode and dump it */
2215 ino_key_init(c, &key, fscki->inum);
2216 err = ubifs_lookup_level0(c, &key, &znode, &n);
2217 if (!err) {
2218 ubifs_err("inode %lu not found in index",
2219 (unsigned long)fscki->inum);
2220 return -ENOENT;
2221 } else if (err < 0) {
2222 ubifs_err("error %d while looking up inode %lu",
2223 err, (unsigned long)fscki->inum);
2224 return err;
2225 }
2226
2227 zbr = &znode->zbranch[n];
2228 ino = kmalloc(zbr->len, GFP_NOFS);
2229 if (!ino)
2230 return -ENOMEM;
2231
2232 err = ubifs_tnc_read_node(c, zbr, ino);
2233 if (err) {
2234 ubifs_err("cannot read inode node at LEB %d:%d, error %d",
2235 zbr->lnum, zbr->offs, err);
2236 kfree(ino);
2237 return err;
2238 }
2239
2240 ubifs_msg("dump of the inode %lu sitting in LEB %d:%d",
2241 (unsigned long)fscki->inum, zbr->lnum, zbr->offs);
2242 ubifs_dump_node(c, ino);
2243 kfree(ino);
2244 return -EINVAL;
2245}
2246
2247/**
2248 * dbg_check_filesystem - check the file-system.
2249 * @c: UBIFS file-system description object
2250 *
2251 * This function checks the file system, namely:
2252 * o makes sure that all leaf nodes exist and their CRCs are correct;
2253 * o makes sure inode nlink, size, xattr size/count are correct (for all
2254 * inodes).
2255 *
2256 * The function reads whole indexing tree and all nodes, so it is pretty
2257 * heavy-weight. Returns zero if the file-system is consistent, %-EINVAL if
2258 * not, and a negative error code in case of failure.
2259 */
2260int dbg_check_filesystem(struct ubifs_info *c)
2261{
2262 int err;
2263 struct fsck_data fsckd;
2264
2265 if (!dbg_is_chk_fs(c))
2266 return 0;
2267
2268 fsckd.inodes = RB_ROOT;
2269 err = dbg_walk_index(c, check_leaf, NULL, &fsckd);
2270 if (err)
2271 goto out_free;
2272
2273 err = check_inodes(c, &fsckd);
2274 if (err)
2275 goto out_free;
2276
2277 free_inodes(&fsckd);
2278 return 0;
2279
2280out_free:
2281 ubifs_err("file-system check failed with error %d", err);
2282 dump_stack();
2283 free_inodes(&fsckd);
2284 return err;
2285}
2286
2287/**
2288 * dbg_check_data_nodes_order - check that list of data nodes is sorted.
2289 * @c: UBIFS file-system description object
2290 * @head: the list of nodes ('struct ubifs_scan_node' objects)
2291 *
2292 * This function returns zero if the list of data nodes is sorted correctly,
2293 * and %-EINVAL if not.
2294 */
2295int dbg_check_data_nodes_order(struct ubifs_info *c, struct list_head *head)
2296{
2297 struct list_head *cur;
2298 struct ubifs_scan_node *sa, *sb;
2299
2300 if (!dbg_is_chk_gen(c))
2301 return 0;
2302
2303 for (cur = head->next; cur->next != head; cur = cur->next) {
2304 ino_t inuma, inumb;
2305 uint32_t blka, blkb;
2306
2307 cond_resched();
2308 sa = container_of(cur, struct ubifs_scan_node, list);
2309 sb = container_of(cur->next, struct ubifs_scan_node, list);
2310
2311 if (sa->type != UBIFS_DATA_NODE) {
2312 ubifs_err("bad node type %d", sa->type);
2313 ubifs_dump_node(c, sa->node);
2314 return -EINVAL;
2315 }
2316 if (sb->type != UBIFS_DATA_NODE) {
2317 ubifs_err("bad node type %d", sb->type);
2318 ubifs_dump_node(c, sb->node);
2319 return -EINVAL;
2320 }
2321
2322 inuma = key_inum(c, &sa->key);
2323 inumb = key_inum(c, &sb->key);
2324
2325 if (inuma < inumb)
2326 continue;
2327 if (inuma > inumb) {
2328 ubifs_err("larger inum %lu goes before inum %lu",
2329 (unsigned long)inuma, (unsigned long)inumb);
2330 goto error_dump;
2331 }
2332
2333 blka = key_block(c, &sa->key);
2334 blkb = key_block(c, &sb->key);
2335
2336 if (blka > blkb) {
2337 ubifs_err("larger block %u goes before %u", blka, blkb);
2338 goto error_dump;
2339 }
2340 if (blka == blkb) {
2341 ubifs_err("two data nodes for the same block");
2342 goto error_dump;
2343 }
2344 }
2345
2346 return 0;
2347
2348error_dump:
2349 ubifs_dump_node(c, sa->node);
2350 ubifs_dump_node(c, sb->node);
2351 return -EINVAL;
2352}
2353
2354/**
2355 * dbg_check_nondata_nodes_order - check that list of data nodes is sorted.
2356 * @c: UBIFS file-system description object
2357 * @head: the list of nodes ('struct ubifs_scan_node' objects)
2358 *
2359 * This function returns zero if the list of non-data nodes is sorted correctly,
2360 * and %-EINVAL if not.
2361 */
2362int dbg_check_nondata_nodes_order(struct ubifs_info *c, struct list_head *head)
2363{
2364 struct list_head *cur;
2365 struct ubifs_scan_node *sa, *sb;
2366
2367 if (!dbg_is_chk_gen(c))
2368 return 0;
2369
2370 for (cur = head->next; cur->next != head; cur = cur->next) {
2371 ino_t inuma, inumb;
2372 uint32_t hasha, hashb;
2373
2374 cond_resched();
2375 sa = container_of(cur, struct ubifs_scan_node, list);
2376 sb = container_of(cur->next, struct ubifs_scan_node, list);
2377
2378 if (sa->type != UBIFS_INO_NODE && sa->type != UBIFS_DENT_NODE &&
2379 sa->type != UBIFS_XENT_NODE) {
2380 ubifs_err("bad node type %d", sa->type);
2381 ubifs_dump_node(c, sa->node);
2382 return -EINVAL;
2383 }
2384 if (sa->type != UBIFS_INO_NODE && sa->type != UBIFS_DENT_NODE &&
2385 sa->type != UBIFS_XENT_NODE) {
2386 ubifs_err("bad node type %d", sb->type);
2387 ubifs_dump_node(c, sb->node);
2388 return -EINVAL;
2389 }
2390
2391 if (sa->type != UBIFS_INO_NODE && sb->type == UBIFS_INO_NODE) {
2392 ubifs_err("non-inode node goes before inode node");
2393 goto error_dump;
2394 }
2395
2396 if (sa->type == UBIFS_INO_NODE && sb->type != UBIFS_INO_NODE)
2397 continue;
2398
2399 if (sa->type == UBIFS_INO_NODE && sb->type == UBIFS_INO_NODE) {
2400 /* Inode nodes are sorted in descending size order */
2401 if (sa->len < sb->len) {
2402 ubifs_err("smaller inode node goes first");
2403 goto error_dump;
2404 }
2405 continue;
2406 }
2407
2408 /*
2409 * This is either a dentry or xentry, which should be sorted in
2410 * ascending (parent ino, hash) order.
2411 */
2412 inuma = key_inum(c, &sa->key);
2413 inumb = key_inum(c, &sb->key);
2414
2415 if (inuma < inumb)
2416 continue;
2417 if (inuma > inumb) {
2418 ubifs_err("larger inum %lu goes before inum %lu",
2419 (unsigned long)inuma, (unsigned long)inumb);
2420 goto error_dump;
2421 }
2422
2423 hasha = key_block(c, &sa->key);
2424 hashb = key_block(c, &sb->key);
2425
2426 if (hasha > hashb) {
2427 ubifs_err("larger hash %u goes before %u",
2428 hasha, hashb);
2429 goto error_dump;
2430 }
2431 }
2432
2433 return 0;
2434
2435error_dump:
2436 ubifs_msg("dumping first node");
2437 ubifs_dump_node(c, sa->node);
2438 ubifs_msg("dumping second node");
2439 ubifs_dump_node(c, sb->node);
2440 return -EINVAL;
2441 return 0;
2442}
2443
2444static inline int chance(unsigned int n, unsigned int out_of)
2445{
2446 return !!((prandom_u32() % out_of) + 1 <= n);
2447
2448}
2449
2450static int power_cut_emulated(struct ubifs_info *c, int lnum, int write)
2451{
2452 struct ubifs_debug_info *d = c->dbg;
2453
2454 ubifs_assert(dbg_is_tst_rcvry(c));
2455
2456 if (!d->pc_cnt) {
2457 /* First call - decide delay to the power cut */
2458 if (chance(1, 2)) {
2459 unsigned long delay;
2460
2461 if (chance(1, 2)) {
2462 d->pc_delay = 1;
2463 /* Fail withing 1 minute */
2464 delay = prandom_u32() % 60000;
2465 d->pc_timeout = jiffies;
2466 d->pc_timeout += msecs_to_jiffies(delay);
2467 ubifs_warn("failing after %lums", delay);
2468 } else {
2469 d->pc_delay = 2;
2470 delay = prandom_u32() % 10000;
2471 /* Fail within 10000 operations */
2472 d->pc_cnt_max = delay;
2473 ubifs_warn("failing after %lu calls", delay);
2474 }
2475 }
2476
2477 d->pc_cnt += 1;
2478 }
2479
2480 /* Determine if failure delay has expired */
2481 if (d->pc_delay == 1 && time_before(jiffies, d->pc_timeout))
2482 return 0;
2483 if (d->pc_delay == 2 && d->pc_cnt++ < d->pc_cnt_max)
2484 return 0;
2485
2486 if (lnum == UBIFS_SB_LNUM) {
2487 if (write && chance(1, 2))
2488 return 0;
2489 if (chance(19, 20))
2490 return 0;
2491 ubifs_warn("failing in super block LEB %d", lnum);
2492 } else if (lnum == UBIFS_MST_LNUM || lnum == UBIFS_MST_LNUM + 1) {
2493 if (chance(19, 20))
2494 return 0;
2495 ubifs_warn("failing in master LEB %d", lnum);
2496 } else if (lnum >= UBIFS_LOG_LNUM && lnum <= c->log_last) {
2497 if (write && chance(99, 100))
2498 return 0;
2499 if (chance(399, 400))
2500 return 0;
2501 ubifs_warn("failing in log LEB %d", lnum);
2502 } else if (lnum >= c->lpt_first && lnum <= c->lpt_last) {
2503 if (write && chance(7, 8))
2504 return 0;
2505 if (chance(19, 20))
2506 return 0;
2507 ubifs_warn("failing in LPT LEB %d", lnum);
2508 } else if (lnum >= c->orph_first && lnum <= c->orph_last) {
2509 if (write && chance(1, 2))
2510 return 0;
2511 if (chance(9, 10))
2512 return 0;
2513 ubifs_warn("failing in orphan LEB %d", lnum);
2514 } else if (lnum == c->ihead_lnum) {
2515 if (chance(99, 100))
2516 return 0;
2517 ubifs_warn("failing in index head LEB %d", lnum);
2518 } else if (c->jheads && lnum == c->jheads[GCHD].wbuf.lnum) {
2519 if (chance(9, 10))
2520 return 0;
2521 ubifs_warn("failing in GC head LEB %d", lnum);
2522 } else if (write && !RB_EMPTY_ROOT(&c->buds) &&
2523 !ubifs_search_bud(c, lnum)) {
2524 if (chance(19, 20))
2525 return 0;
2526 ubifs_warn("failing in non-bud LEB %d", lnum);
2527 } else if (c->cmt_state == COMMIT_RUNNING_BACKGROUND ||
2528 c->cmt_state == COMMIT_RUNNING_REQUIRED) {
2529 if (chance(999, 1000))
2530 return 0;
2531 ubifs_warn("failing in bud LEB %d commit running", lnum);
2532 } else {
2533 if (chance(9999, 10000))
2534 return 0;
2535 ubifs_warn("failing in bud LEB %d commit not running", lnum);
2536 }
2537
2538 d->pc_happened = 1;
2539 ubifs_warn("========== Power cut emulated ==========");
2540 dump_stack();
2541 return 1;
2542}
2543
2544static int corrupt_data(const struct ubifs_info *c, const void *buf,
2545 unsigned int len)
2546{
2547 unsigned int from, to, ffs = chance(1, 2);
2548 unsigned char *p = (void *)buf;
2549
2550 from = prandom_u32() % len;
2551 /* Corruption span max to end of write unit */
2552 to = min(len, ALIGN(from + 1, c->max_write_size));
2553
2554 ubifs_warn("filled bytes %u-%u with %s", from, to - 1,
2555 ffs ? "0xFFs" : "random data");
2556
2557 if (ffs)
2558 memset(p + from, 0xFF, to - from);
2559 else
2560 prandom_bytes(p + from, to - from);
2561
2562 return to;
2563}
2564
2565int dbg_leb_write(struct ubifs_info *c, int lnum, const void *buf,
2566 int offs, int len)
2567{
2568 int err, failing;
2569
2570 if (c->dbg->pc_happened)
2571 return -EROFS;
2572
2573 failing = power_cut_emulated(c, lnum, 1);
2574 if (failing) {
2575 len = corrupt_data(c, buf, len);
2576 ubifs_warn("actually write %d bytes to LEB %d:%d (the buffer was corrupted)",
2577 len, lnum, offs);
2578 }
2579 err = ubi_leb_write(c->ubi, lnum, buf, offs, len);
2580 if (err)
2581 return err;
2582 if (failing)
2583 return -EROFS;
2584 return 0;
2585}
2586
2587int dbg_leb_change(struct ubifs_info *c, int lnum, const void *buf,
2588 int len)
2589{
2590 int err;
2591
2592 if (c->dbg->pc_happened)
2593 return -EROFS;
2594 if (power_cut_emulated(c, lnum, 1))
2595 return -EROFS;
2596 err = ubi_leb_change(c->ubi, lnum, buf, len);
2597 if (err)
2598 return err;
2599 if (power_cut_emulated(c, lnum, 1))
2600 return -EROFS;
2601 return 0;
2602}
2603
2604int dbg_leb_unmap(struct ubifs_info *c, int lnum)
2605{
2606 int err;
2607
2608 if (c->dbg->pc_happened)
2609 return -EROFS;
2610 if (power_cut_emulated(c, lnum, 0))
2611 return -EROFS;
2612 err = ubi_leb_unmap(c->ubi, lnum);
2613 if (err)
2614 return err;
2615 if (power_cut_emulated(c, lnum, 0))
2616 return -EROFS;
2617 return 0;
2618}
2619
2620int dbg_leb_map(struct ubifs_info *c, int lnum)
2621{
2622 int err;
2623
2624 if (c->dbg->pc_happened)
2625 return -EROFS;
2626 if (power_cut_emulated(c, lnum, 0))
2627 return -EROFS;
2628 err = ubi_leb_map(c->ubi, lnum);
2629 if (err)
2630 return err;
2631 if (power_cut_emulated(c, lnum, 0))
2632 return -EROFS;
2633 return 0;
2634}
2635
2636/*
2637 * Root directory for UBIFS stuff in debugfs. Contains sub-directories which
2638 * contain the stuff specific to particular file-system mounts.
2639 */
2640static struct dentry *dfs_rootdir;
2641
2642static int dfs_file_open(struct inode *inode, struct file *file)
2643{
2644 file->private_data = inode->i_private;
2645 return nonseekable_open(inode, file);
2646}
2647
2648/**
2649 * provide_user_output - provide output to the user reading a debugfs file.
2650 * @val: boolean value for the answer
2651 * @u: the buffer to store the answer at
2652 * @count: size of the buffer
2653 * @ppos: position in the @u output buffer
2654 *
2655 * This is a simple helper function which stores @val boolean value in the user
2656 * buffer when the user reads one of UBIFS debugfs files. Returns amount of
2657 * bytes written to @u in case of success and a negative error code in case of
2658 * failure.
2659 */
2660static int provide_user_output(int val, char __user *u, size_t count,
2661 loff_t *ppos)
2662{
2663 char buf[3];
2664
2665 if (val)
2666 buf[0] = '1';
2667 else
2668 buf[0] = '0';
2669 buf[1] = '\n';
2670 buf[2] = 0x00;
2671
2672 return simple_read_from_buffer(u, count, ppos, buf, 2);
2673}
2674
2675static ssize_t dfs_file_read(struct file *file, char __user *u, size_t count,
2676 loff_t *ppos)
2677{
2678 struct dentry *dent = file->f_path.dentry;
2679 struct ubifs_info *c = file->private_data;
2680 struct ubifs_debug_info *d = c->dbg;
2681 int val;
2682
2683 if (dent == d->dfs_chk_gen)
2684 val = d->chk_gen;
2685 else if (dent == d->dfs_chk_index)
2686 val = d->chk_index;
2687 else if (dent == d->dfs_chk_orph)
2688 val = d->chk_orph;
2689 else if (dent == d->dfs_chk_lprops)
2690 val = d->chk_lprops;
2691 else if (dent == d->dfs_chk_fs)
2692 val = d->chk_fs;
2693 else if (dent == d->dfs_tst_rcvry)
2694 val = d->tst_rcvry;
2695 else if (dent == d->dfs_ro_error)
2696 val = c->ro_error;
2697 else
2698 return -EINVAL;
2699
2700 return provide_user_output(val, u, count, ppos);
2701}
2702
2703/**
2704 * interpret_user_input - interpret user debugfs file input.
2705 * @u: user-provided buffer with the input
2706 * @count: buffer size
2707 *
2708 * This is a helper function which interpret user input to a boolean UBIFS
2709 * debugfs file. Returns %0 or %1 in case of success and a negative error code
2710 * in case of failure.
2711 */
2712static int interpret_user_input(const char __user *u, size_t count)
2713{
2714 size_t buf_size;
2715 char buf[8];
2716
2717 buf_size = min_t(size_t, count, (sizeof(buf) - 1));
2718 if (copy_from_user(buf, u, buf_size))
2719 return -EFAULT;
2720
2721 if (buf[0] == '1')
2722 return 1;
2723 else if (buf[0] == '0')
2724 return 0;
2725
2726 return -EINVAL;
2727}
2728
2729static ssize_t dfs_file_write(struct file *file, const char __user *u,
2730 size_t count, loff_t *ppos)
2731{
2732 struct ubifs_info *c = file->private_data;
2733 struct ubifs_debug_info *d = c->dbg;
2734 struct dentry *dent = file->f_path.dentry;
2735 int val;
2736
2737 /*
2738 * TODO: this is racy - the file-system might have already been
2739 * unmounted and we'd oops in this case. The plan is to fix it with
2740 * help of 'iterate_supers_type()' which we should have in v3.0: when
2741 * a debugfs opened, we rember FS's UUID in file->private_data. Then
2742 * whenever we access the FS via a debugfs file, we iterate all UBIFS
2743 * superblocks and fine the one with the same UUID, and take the
2744 * locking right.
2745 *
2746 * The other way to go suggested by Al Viro is to create a separate
2747 * 'ubifs-debug' file-system instead.
2748 */
2749 if (file->f_path.dentry == d->dfs_dump_lprops) {
2750 ubifs_dump_lprops(c);
2751 return count;
2752 }
2753 if (file->f_path.dentry == d->dfs_dump_budg) {
2754 ubifs_dump_budg(c, &c->bi);
2755 return count;
2756 }
2757 if (file->f_path.dentry == d->dfs_dump_tnc) {
2758 mutex_lock(&c->tnc_mutex);
2759 ubifs_dump_tnc(c);
2760 mutex_unlock(&c->tnc_mutex);
2761 return count;
2762 }
2763
2764 val = interpret_user_input(u, count);
2765 if (val < 0)
2766 return val;
2767
2768 if (dent == d->dfs_chk_gen)
2769 d->chk_gen = val;
2770 else if (dent == d->dfs_chk_index)
2771 d->chk_index = val;
2772 else if (dent == d->dfs_chk_orph)
2773 d->chk_orph = val;
2774 else if (dent == d->dfs_chk_lprops)
2775 d->chk_lprops = val;
2776 else if (dent == d->dfs_chk_fs)
2777 d->chk_fs = val;
2778 else if (dent == d->dfs_tst_rcvry)
2779 d->tst_rcvry = val;
2780 else if (dent == d->dfs_ro_error)
2781 c->ro_error = !!val;
2782 else
2783 return -EINVAL;
2784
2785 return count;
2786}
2787
2788static const struct file_operations dfs_fops = {
2789 .open = dfs_file_open,
2790 .read = dfs_file_read,
2791 .write = dfs_file_write,
2792 .owner = THIS_MODULE,
2793 .llseek = no_llseek,
2794};
2795
2796/**
2797 * dbg_debugfs_init_fs - initialize debugfs for UBIFS instance.
2798 * @c: UBIFS file-system description object
2799 *
2800 * This function creates all debugfs files for this instance of UBIFS. Returns
2801 * zero in case of success and a negative error code in case of failure.
2802 *
2803 * Note, the only reason we have not merged this function with the
2804 * 'ubifs_debugging_init()' function is because it is better to initialize
2805 * debugfs interfaces at the very end of the mount process, and remove them at
2806 * the very beginning of the mount process.
2807 */
2808int dbg_debugfs_init_fs(struct ubifs_info *c)
2809{
2810 int err, n;
2811 const char *fname;
2812 struct dentry *dent;
2813 struct ubifs_debug_info *d = c->dbg;
2814
2815 if (!IS_ENABLED(CONFIG_DEBUG_FS))
2816 return 0;
2817
2818 n = snprintf(d->dfs_dir_name, UBIFS_DFS_DIR_LEN + 1, UBIFS_DFS_DIR_NAME,
2819 c->vi.ubi_num, c->vi.vol_id);
2820 if (n == UBIFS_DFS_DIR_LEN) {
2821 /* The array size is too small */
2822 fname = UBIFS_DFS_DIR_NAME;
2823 dent = ERR_PTR(-EINVAL);
2824 goto out;
2825 }
2826
2827 fname = d->dfs_dir_name;
2828 dent = debugfs_create_dir(fname, dfs_rootdir);
2829 if (IS_ERR_OR_NULL(dent))
2830 goto out;
2831 d->dfs_dir = dent;
2832
2833 fname = "dump_lprops";
2834 dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, c, &dfs_fops);
2835 if (IS_ERR_OR_NULL(dent))
2836 goto out_remove;
2837 d->dfs_dump_lprops = dent;
2838
2839 fname = "dump_budg";
2840 dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, c, &dfs_fops);
2841 if (IS_ERR_OR_NULL(dent))
2842 goto out_remove;
2843 d->dfs_dump_budg = dent;
2844
2845 fname = "dump_tnc";
2846 dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, c, &dfs_fops);
2847 if (IS_ERR_OR_NULL(dent))
2848 goto out_remove;
2849 d->dfs_dump_tnc = dent;
2850
2851 fname = "chk_general";
2852 dent = debugfs_create_file(fname, S_IRUSR | S_IWUSR, d->dfs_dir, c,
2853 &dfs_fops);
2854 if (IS_ERR_OR_NULL(dent))
2855 goto out_remove;
2856 d->dfs_chk_gen = dent;
2857
2858 fname = "chk_index";
2859 dent = debugfs_create_file(fname, S_IRUSR | S_IWUSR, d->dfs_dir, c,
2860 &dfs_fops);
2861 if (IS_ERR_OR_NULL(dent))
2862 goto out_remove;
2863 d->dfs_chk_index = dent;
2864
2865 fname = "chk_orphans";
2866 dent = debugfs_create_file(fname, S_IRUSR | S_IWUSR, d->dfs_dir, c,
2867 &dfs_fops);
2868 if (IS_ERR_OR_NULL(dent))
2869 goto out_remove;
2870 d->dfs_chk_orph = dent;
2871
2872 fname = "chk_lprops";
2873 dent = debugfs_create_file(fname, S_IRUSR | S_IWUSR, d->dfs_dir, c,
2874 &dfs_fops);
2875 if (IS_ERR_OR_NULL(dent))
2876 goto out_remove;
2877 d->dfs_chk_lprops = dent;
2878
2879 fname = "chk_fs";
2880 dent = debugfs_create_file(fname, S_IRUSR | S_IWUSR, d->dfs_dir, c,
2881 &dfs_fops);
2882 if (IS_ERR_OR_NULL(dent))
2883 goto out_remove;
2884 d->dfs_chk_fs = dent;
2885
2886 fname = "tst_recovery";
2887 dent = debugfs_create_file(fname, S_IRUSR | S_IWUSR, d->dfs_dir, c,
2888 &dfs_fops);
2889 if (IS_ERR_OR_NULL(dent))
2890 goto out_remove;
2891 d->dfs_tst_rcvry = dent;
2892
2893 fname = "ro_error";
2894 dent = debugfs_create_file(fname, S_IRUSR | S_IWUSR, d->dfs_dir, c,
2895 &dfs_fops);
2896 if (IS_ERR_OR_NULL(dent))
2897 goto out_remove;
2898 d->dfs_ro_error = dent;
2899
2900 return 0;
2901
2902out_remove:
2903 debugfs_remove_recursive(d->dfs_dir);
2904out:
2905 err = dent ? PTR_ERR(dent) : -ENODEV;
2906 ubifs_err("cannot create \"%s\" debugfs file or directory, error %d\n",
2907 fname, err);
2908 return err;
2909}
2910
2911/**
2912 * dbg_debugfs_exit_fs - remove all debugfs files.
2913 * @c: UBIFS file-system description object
2914 */
2915void dbg_debugfs_exit_fs(struct ubifs_info *c)
2916{
2917 if (IS_ENABLED(CONFIG_DEBUG_FS))
2918 debugfs_remove_recursive(c->dbg->dfs_dir);
2919}
2920
2921struct ubifs_global_debug_info ubifs_dbg;
2922
2923static struct dentry *dfs_chk_gen;
2924static struct dentry *dfs_chk_index;
2925static struct dentry *dfs_chk_orph;
2926static struct dentry *dfs_chk_lprops;
2927static struct dentry *dfs_chk_fs;
2928static struct dentry *dfs_tst_rcvry;
2929
2930static ssize_t dfs_global_file_read(struct file *file, char __user *u,
2931 size_t count, loff_t *ppos)
2932{
2933 struct dentry *dent = file->f_path.dentry;
2934 int val;
2935
2936 if (dent == dfs_chk_gen)
2937 val = ubifs_dbg.chk_gen;
2938 else if (dent == dfs_chk_index)
2939 val = ubifs_dbg.chk_index;
2940 else if (dent == dfs_chk_orph)
2941 val = ubifs_dbg.chk_orph;
2942 else if (dent == dfs_chk_lprops)
2943 val = ubifs_dbg.chk_lprops;
2944 else if (dent == dfs_chk_fs)
2945 val = ubifs_dbg.chk_fs;
2946 else if (dent == dfs_tst_rcvry)
2947 val = ubifs_dbg.tst_rcvry;
2948 else
2949 return -EINVAL;
2950
2951 return provide_user_output(val, u, count, ppos);
2952}
2953
2954static ssize_t dfs_global_file_write(struct file *file, const char __user *u,
2955 size_t count, loff_t *ppos)
2956{
2957 struct dentry *dent = file->f_path.dentry;
2958 int val;
2959
2960 val = interpret_user_input(u, count);
2961 if (val < 0)
2962 return val;
2963
2964 if (dent == dfs_chk_gen)
2965 ubifs_dbg.chk_gen = val;
2966 else if (dent == dfs_chk_index)
2967 ubifs_dbg.chk_index = val;
2968 else if (dent == dfs_chk_orph)
2969 ubifs_dbg.chk_orph = val;
2970 else if (dent == dfs_chk_lprops)
2971 ubifs_dbg.chk_lprops = val;
2972 else if (dent == dfs_chk_fs)
2973 ubifs_dbg.chk_fs = val;
2974 else if (dent == dfs_tst_rcvry)
2975 ubifs_dbg.tst_rcvry = val;
2976 else
2977 return -EINVAL;
2978
2979 return count;
2980}
2981
2982static const struct file_operations dfs_global_fops = {
2983 .read = dfs_global_file_read,
2984 .write = dfs_global_file_write,
2985 .owner = THIS_MODULE,
2986 .llseek = no_llseek,
2987};
2988
2989/**
2990 * dbg_debugfs_init - initialize debugfs file-system.
2991 *
2992 * UBIFS uses debugfs file-system to expose various debugging knobs to
2993 * user-space. This function creates "ubifs" directory in the debugfs
2994 * file-system. Returns zero in case of success and a negative error code in
2995 * case of failure.
2996 */
2997int dbg_debugfs_init(void)
2998{
2999 int err;
3000 const char *fname;
3001 struct dentry *dent;
3002
3003 if (!IS_ENABLED(CONFIG_DEBUG_FS))
3004 return 0;
3005
3006 fname = "ubifs";
3007 dent = debugfs_create_dir(fname, NULL);
3008 if (IS_ERR_OR_NULL(dent))
3009 goto out;
3010 dfs_rootdir = dent;
3011
3012 fname = "chk_general";
3013 dent = debugfs_create_file(fname, S_IRUSR | S_IWUSR, dfs_rootdir, NULL,
3014 &dfs_global_fops);
3015 if (IS_ERR_OR_NULL(dent))
3016 goto out_remove;
3017 dfs_chk_gen = dent;
3018
3019 fname = "chk_index";
3020 dent = debugfs_create_file(fname, S_IRUSR | S_IWUSR, dfs_rootdir, NULL,
3021 &dfs_global_fops);
3022 if (IS_ERR_OR_NULL(dent))
3023 goto out_remove;
3024 dfs_chk_index = dent;
3025
3026 fname = "chk_orphans";
3027 dent = debugfs_create_file(fname, S_IRUSR | S_IWUSR, dfs_rootdir, NULL,
3028 &dfs_global_fops);
3029 if (IS_ERR_OR_NULL(dent))
3030 goto out_remove;
3031 dfs_chk_orph = dent;
3032
3033 fname = "chk_lprops";
3034 dent = debugfs_create_file(fname, S_IRUSR | S_IWUSR, dfs_rootdir, NULL,
3035 &dfs_global_fops);
3036 if (IS_ERR_OR_NULL(dent))
3037 goto out_remove;
3038 dfs_chk_lprops = dent;
3039
3040 fname = "chk_fs";
3041 dent = debugfs_create_file(fname, S_IRUSR | S_IWUSR, dfs_rootdir, NULL,
3042 &dfs_global_fops);
3043 if (IS_ERR_OR_NULL(dent))
3044 goto out_remove;
3045 dfs_chk_fs = dent;
3046
3047 fname = "tst_recovery";
3048 dent = debugfs_create_file(fname, S_IRUSR | S_IWUSR, dfs_rootdir, NULL,
3049 &dfs_global_fops);
3050 if (IS_ERR_OR_NULL(dent))
3051 goto out_remove;
3052 dfs_tst_rcvry = dent;
3053
3054 return 0;
3055
3056out_remove:
3057 debugfs_remove_recursive(dfs_rootdir);
3058out:
3059 err = dent ? PTR_ERR(dent) : -ENODEV;
3060 ubifs_err("cannot create \"%s\" debugfs file or directory, error %d\n",
3061 fname, err);
3062 return err;
3063}
3064
3065/**
3066 * dbg_debugfs_exit - remove the "ubifs" directory from debugfs file-system.
3067 */
3068void dbg_debugfs_exit(void)
3069{
3070 if (IS_ENABLED(CONFIG_DEBUG_FS))
3071 debugfs_remove_recursive(dfs_rootdir);
3072}
3073
3074/**
3075 * ubifs_debugging_init - initialize UBIFS debugging.
3076 * @c: UBIFS file-system description object
3077 *
3078 * This function initializes debugging-related data for the file system.
3079 * Returns zero in case of success and a negative error code in case of
3080 * failure.
3081 */
3082int ubifs_debugging_init(struct ubifs_info *c)
3083{
3084 c->dbg = kzalloc(sizeof(struct ubifs_debug_info), GFP_KERNEL);
3085 if (!c->dbg)
3086 return -ENOMEM;
3087
3088 return 0;
3089}
3090
3091/**
3092 * ubifs_debugging_exit - free debugging data.
3093 * @c: UBIFS file-system description object
3094 */
3095void ubifs_debugging_exit(struct ubifs_info *c)
3096{
3097 kfree(c->dbg);
3098}