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Tom Rini83d290c2018-05-06 17:58:06 -04001// SPDX-License-Identifier: GPL-2.0+
Stefan Roese9eefe2a2009-03-19 15:35:05 +01002/*
3 * This file is part of UBIFS.
4 *
5 * Copyright (C) 2006-2008 Nokia Corporation.
6 *
Stefan Roese9eefe2a2009-03-19 15:35:05 +01007 * Authors: Adrian Hunter
8 * Artem Bityutskiy (Битюцкий Артём)
9 */
10
11/*
12 * This file implements the functions that access LEB properties and their
13 * categories. LEBs are categorized based on the needs of UBIFS, and the
14 * categories are stored as either heaps or lists to provide a fast way of
15 * finding a LEB in a particular category. For example, UBIFS may need to find
16 * an empty LEB for the journal, or a very dirty LEB for garbage collection.
17 */
18
Heiko Schocherff94bc42014-06-24 10:10:04 +020019#ifdef __UBOOT__
Simon Glassf7ae49f2020-05-10 11:40:05 -060020#include <log.h>
Simon Glass336d4612020-02-03 07:36:16 -070021#include <malloc.h>
Heiko Schocherff94bc42014-06-24 10:10:04 +020022#include <linux/err.h>
23#endif
Stefan Roese9eefe2a2009-03-19 15:35:05 +010024#include "ubifs.h"
25
26/**
27 * get_heap_comp_val - get the LEB properties value for heap comparisons.
28 * @lprops: LEB properties
29 * @cat: LEB category
30 */
31static int get_heap_comp_val(struct ubifs_lprops *lprops, int cat)
32{
33 switch (cat) {
34 case LPROPS_FREE:
35 return lprops->free;
36 case LPROPS_DIRTY_IDX:
37 return lprops->free + lprops->dirty;
38 default:
39 return lprops->dirty;
40 }
41}
42
43/**
44 * move_up_lpt_heap - move a new heap entry up as far as possible.
45 * @c: UBIFS file-system description object
46 * @heap: LEB category heap
47 * @lprops: LEB properties to move
48 * @cat: LEB category
49 *
50 * New entries to a heap are added at the bottom and then moved up until the
51 * parent's value is greater. In the case of LPT's category heaps, the value
52 * is either the amount of free space or the amount of dirty space, depending
53 * on the category.
54 */
55static void move_up_lpt_heap(struct ubifs_info *c, struct ubifs_lpt_heap *heap,
56 struct ubifs_lprops *lprops, int cat)
57{
58 int val1, val2, hpos;
59
60 hpos = lprops->hpos;
61 if (!hpos)
62 return; /* Already top of the heap */
63 val1 = get_heap_comp_val(lprops, cat);
64 /* Compare to parent and, if greater, move up the heap */
65 do {
66 int ppos = (hpos - 1) / 2;
67
68 val2 = get_heap_comp_val(heap->arr[ppos], cat);
69 if (val2 >= val1)
70 return;
71 /* Greater than parent so move up */
72 heap->arr[ppos]->hpos = hpos;
73 heap->arr[hpos] = heap->arr[ppos];
74 heap->arr[ppos] = lprops;
75 lprops->hpos = ppos;
76 hpos = ppos;
77 } while (hpos);
78}
79
80/**
81 * adjust_lpt_heap - move a changed heap entry up or down the heap.
82 * @c: UBIFS file-system description object
83 * @heap: LEB category heap
84 * @lprops: LEB properties to move
85 * @hpos: heap position of @lprops
86 * @cat: LEB category
87 *
88 * Changed entries in a heap are moved up or down until the parent's value is
89 * greater. In the case of LPT's category heaps, the value is either the amount
90 * of free space or the amount of dirty space, depending on the category.
91 */
92static void adjust_lpt_heap(struct ubifs_info *c, struct ubifs_lpt_heap *heap,
93 struct ubifs_lprops *lprops, int hpos, int cat)
94{
95 int val1, val2, val3, cpos;
96
97 val1 = get_heap_comp_val(lprops, cat);
98 /* Compare to parent and, if greater than parent, move up the heap */
99 if (hpos) {
100 int ppos = (hpos - 1) / 2;
101
102 val2 = get_heap_comp_val(heap->arr[ppos], cat);
103 if (val1 > val2) {
104 /* Greater than parent so move up */
105 while (1) {
106 heap->arr[ppos]->hpos = hpos;
107 heap->arr[hpos] = heap->arr[ppos];
108 heap->arr[ppos] = lprops;
109 lprops->hpos = ppos;
110 hpos = ppos;
111 if (!hpos)
112 return;
113 ppos = (hpos - 1) / 2;
114 val2 = get_heap_comp_val(heap->arr[ppos], cat);
115 if (val1 <= val2)
116 return;
117 /* Still greater than parent so keep going */
118 }
119 }
120 }
121
122 /* Not greater than parent, so compare to children */
123 while (1) {
124 /* Compare to left child */
125 cpos = hpos * 2 + 1;
126 if (cpos >= heap->cnt)
127 return;
128 val2 = get_heap_comp_val(heap->arr[cpos], cat);
129 if (val1 < val2) {
130 /* Less than left child, so promote biggest child */
131 if (cpos + 1 < heap->cnt) {
132 val3 = get_heap_comp_val(heap->arr[cpos + 1],
133 cat);
134 if (val3 > val2)
135 cpos += 1; /* Right child is bigger */
136 }
137 heap->arr[cpos]->hpos = hpos;
138 heap->arr[hpos] = heap->arr[cpos];
139 heap->arr[cpos] = lprops;
140 lprops->hpos = cpos;
141 hpos = cpos;
142 continue;
143 }
144 /* Compare to right child */
145 cpos += 1;
146 if (cpos >= heap->cnt)
147 return;
148 val3 = get_heap_comp_val(heap->arr[cpos], cat);
149 if (val1 < val3) {
150 /* Less than right child, so promote right child */
151 heap->arr[cpos]->hpos = hpos;
152 heap->arr[hpos] = heap->arr[cpos];
153 heap->arr[cpos] = lprops;
154 lprops->hpos = cpos;
155 hpos = cpos;
156 continue;
157 }
158 return;
159 }
160}
161
162/**
163 * add_to_lpt_heap - add LEB properties to a LEB category heap.
164 * @c: UBIFS file-system description object
165 * @lprops: LEB properties to add
166 * @cat: LEB category
167 *
168 * This function returns %1 if @lprops is added to the heap for LEB category
169 * @cat, otherwise %0 is returned because the heap is full.
170 */
171static int add_to_lpt_heap(struct ubifs_info *c, struct ubifs_lprops *lprops,
172 int cat)
173{
174 struct ubifs_lpt_heap *heap = &c->lpt_heap[cat - 1];
175
176 if (heap->cnt >= heap->max_cnt) {
177 const int b = LPT_HEAP_SZ / 2 - 1;
178 int cpos, val1, val2;
179
180 /* Compare to some other LEB on the bottom of heap */
181 /* Pick a position kind of randomly */
182 cpos = (((size_t)lprops >> 4) & b) + b;
183 ubifs_assert(cpos >= b);
184 ubifs_assert(cpos < LPT_HEAP_SZ);
185 ubifs_assert(cpos < heap->cnt);
186
187 val1 = get_heap_comp_val(lprops, cat);
188 val2 = get_heap_comp_val(heap->arr[cpos], cat);
189 if (val1 > val2) {
190 struct ubifs_lprops *lp;
191
192 lp = heap->arr[cpos];
193 lp->flags &= ~LPROPS_CAT_MASK;
194 lp->flags |= LPROPS_UNCAT;
195 list_add(&lp->list, &c->uncat_list);
196 lprops->hpos = cpos;
197 heap->arr[cpos] = lprops;
198 move_up_lpt_heap(c, heap, lprops, cat);
199 dbg_check_heap(c, heap, cat, lprops->hpos);
200 return 1; /* Added to heap */
201 }
202 dbg_check_heap(c, heap, cat, -1);
203 return 0; /* Not added to heap */
204 } else {
205 lprops->hpos = heap->cnt++;
206 heap->arr[lprops->hpos] = lprops;
207 move_up_lpt_heap(c, heap, lprops, cat);
208 dbg_check_heap(c, heap, cat, lprops->hpos);
209 return 1; /* Added to heap */
210 }
211}
212
213/**
214 * remove_from_lpt_heap - remove LEB properties from a LEB category heap.
215 * @c: UBIFS file-system description object
216 * @lprops: LEB properties to remove
217 * @cat: LEB category
218 */
219static void remove_from_lpt_heap(struct ubifs_info *c,
220 struct ubifs_lprops *lprops, int cat)
221{
222 struct ubifs_lpt_heap *heap;
223 int hpos = lprops->hpos;
224
225 heap = &c->lpt_heap[cat - 1];
226 ubifs_assert(hpos >= 0 && hpos < heap->cnt);
227 ubifs_assert(heap->arr[hpos] == lprops);
228 heap->cnt -= 1;
229 if (hpos < heap->cnt) {
230 heap->arr[hpos] = heap->arr[heap->cnt];
231 heap->arr[hpos]->hpos = hpos;
232 adjust_lpt_heap(c, heap, heap->arr[hpos], hpos, cat);
233 }
234 dbg_check_heap(c, heap, cat, -1);
235}
236
237/**
238 * lpt_heap_replace - replace lprops in a category heap.
239 * @c: UBIFS file-system description object
240 * @old_lprops: LEB properties to replace
241 * @new_lprops: LEB properties with which to replace
242 * @cat: LEB category
243 *
244 * During commit it is sometimes necessary to copy a pnode (see dirty_cow_pnode)
245 * and the lprops that the pnode contains. When that happens, references in
246 * the category heaps to those lprops must be updated to point to the new
247 * lprops. This function does that.
248 */
249static void lpt_heap_replace(struct ubifs_info *c,
250 struct ubifs_lprops *old_lprops,
251 struct ubifs_lprops *new_lprops, int cat)
252{
253 struct ubifs_lpt_heap *heap;
254 int hpos = new_lprops->hpos;
255
256 heap = &c->lpt_heap[cat - 1];
257 heap->arr[hpos] = new_lprops;
258}
259
260/**
261 * ubifs_add_to_cat - add LEB properties to a category list or heap.
262 * @c: UBIFS file-system description object
263 * @lprops: LEB properties to add
264 * @cat: LEB category to which to add
265 *
266 * LEB properties are categorized to enable fast find operations.
267 */
268void ubifs_add_to_cat(struct ubifs_info *c, struct ubifs_lprops *lprops,
269 int cat)
270{
271 switch (cat) {
272 case LPROPS_DIRTY:
273 case LPROPS_DIRTY_IDX:
274 case LPROPS_FREE:
275 if (add_to_lpt_heap(c, lprops, cat))
276 break;
Heiko Schocherff94bc42014-06-24 10:10:04 +0200277 /* No more room on heap so make it un-categorized */
Stefan Roese9eefe2a2009-03-19 15:35:05 +0100278 cat = LPROPS_UNCAT;
279 /* Fall through */
280 case LPROPS_UNCAT:
281 list_add(&lprops->list, &c->uncat_list);
282 break;
283 case LPROPS_EMPTY:
284 list_add(&lprops->list, &c->empty_list);
285 break;
286 case LPROPS_FREEABLE:
287 list_add(&lprops->list, &c->freeable_list);
288 c->freeable_cnt += 1;
289 break;
290 case LPROPS_FRDI_IDX:
291 list_add(&lprops->list, &c->frdi_idx_list);
292 break;
293 default:
294 ubifs_assert(0);
295 }
Heiko Schocherff94bc42014-06-24 10:10:04 +0200296
Stefan Roese9eefe2a2009-03-19 15:35:05 +0100297 lprops->flags &= ~LPROPS_CAT_MASK;
298 lprops->flags |= cat;
Heiko Schocherff94bc42014-06-24 10:10:04 +0200299 c->in_a_category_cnt += 1;
300 ubifs_assert(c->in_a_category_cnt <= c->main_lebs);
Stefan Roese9eefe2a2009-03-19 15:35:05 +0100301}
302
303/**
304 * ubifs_remove_from_cat - remove LEB properties from a category list or heap.
305 * @c: UBIFS file-system description object
306 * @lprops: LEB properties to remove
307 * @cat: LEB category from which to remove
308 *
309 * LEB properties are categorized to enable fast find operations.
310 */
311static void ubifs_remove_from_cat(struct ubifs_info *c,
312 struct ubifs_lprops *lprops, int cat)
313{
314 switch (cat) {
315 case LPROPS_DIRTY:
316 case LPROPS_DIRTY_IDX:
317 case LPROPS_FREE:
318 remove_from_lpt_heap(c, lprops, cat);
319 break;
320 case LPROPS_FREEABLE:
321 c->freeable_cnt -= 1;
322 ubifs_assert(c->freeable_cnt >= 0);
323 /* Fall through */
324 case LPROPS_UNCAT:
325 case LPROPS_EMPTY:
326 case LPROPS_FRDI_IDX:
327 ubifs_assert(!list_empty(&lprops->list));
328 list_del(&lprops->list);
329 break;
330 default:
331 ubifs_assert(0);
332 }
Heiko Schocherff94bc42014-06-24 10:10:04 +0200333
334 c->in_a_category_cnt -= 1;
335 ubifs_assert(c->in_a_category_cnt >= 0);
Stefan Roese9eefe2a2009-03-19 15:35:05 +0100336}
337
338/**
339 * ubifs_replace_cat - replace lprops in a category list or heap.
340 * @c: UBIFS file-system description object
341 * @old_lprops: LEB properties to replace
342 * @new_lprops: LEB properties with which to replace
343 *
344 * During commit it is sometimes necessary to copy a pnode (see dirty_cow_pnode)
345 * and the lprops that the pnode contains. When that happens, references in
346 * category lists and heaps must be replaced. This function does that.
347 */
348void ubifs_replace_cat(struct ubifs_info *c, struct ubifs_lprops *old_lprops,
349 struct ubifs_lprops *new_lprops)
350{
351 int cat;
352
353 cat = new_lprops->flags & LPROPS_CAT_MASK;
354 switch (cat) {
355 case LPROPS_DIRTY:
356 case LPROPS_DIRTY_IDX:
357 case LPROPS_FREE:
358 lpt_heap_replace(c, old_lprops, new_lprops, cat);
359 break;
360 case LPROPS_UNCAT:
361 case LPROPS_EMPTY:
362 case LPROPS_FREEABLE:
363 case LPROPS_FRDI_IDX:
364 list_replace(&old_lprops->list, &new_lprops->list);
365 break;
366 default:
367 ubifs_assert(0);
368 }
369}
370
371/**
372 * ubifs_ensure_cat - ensure LEB properties are categorized.
373 * @c: UBIFS file-system description object
374 * @lprops: LEB properties
375 *
376 * A LEB may have fallen off of the bottom of a heap, and ended up as
Heiko Schocherff94bc42014-06-24 10:10:04 +0200377 * un-categorized even though it has enough space for us now. If that is the
378 * case this function will put the LEB back onto a heap.
Stefan Roese9eefe2a2009-03-19 15:35:05 +0100379 */
380void ubifs_ensure_cat(struct ubifs_info *c, struct ubifs_lprops *lprops)
381{
382 int cat = lprops->flags & LPROPS_CAT_MASK;
383
384 if (cat != LPROPS_UNCAT)
385 return;
386 cat = ubifs_categorize_lprops(c, lprops);
387 if (cat == LPROPS_UNCAT)
388 return;
389 ubifs_remove_from_cat(c, lprops, LPROPS_UNCAT);
390 ubifs_add_to_cat(c, lprops, cat);
391}
392
393/**
394 * ubifs_categorize_lprops - categorize LEB properties.
395 * @c: UBIFS file-system description object
396 * @lprops: LEB properties to categorize
397 *
398 * LEB properties are categorized to enable fast find operations. This function
399 * returns the LEB category to which the LEB properties belong. Note however
400 * that if the LEB category is stored as a heap and the heap is full, the
401 * LEB properties may have their category changed to %LPROPS_UNCAT.
402 */
403int ubifs_categorize_lprops(const struct ubifs_info *c,
404 const struct ubifs_lprops *lprops)
405{
406 if (lprops->flags & LPROPS_TAKEN)
407 return LPROPS_UNCAT;
408
409 if (lprops->free == c->leb_size) {
410 ubifs_assert(!(lprops->flags & LPROPS_INDEX));
411 return LPROPS_EMPTY;
412 }
413
414 if (lprops->free + lprops->dirty == c->leb_size) {
415 if (lprops->flags & LPROPS_INDEX)
416 return LPROPS_FRDI_IDX;
417 else
418 return LPROPS_FREEABLE;
419 }
420
421 if (lprops->flags & LPROPS_INDEX) {
422 if (lprops->dirty + lprops->free >= c->min_idx_node_sz)
423 return LPROPS_DIRTY_IDX;
424 } else {
425 if (lprops->dirty >= c->dead_wm &&
426 lprops->dirty > lprops->free)
427 return LPROPS_DIRTY;
428 if (lprops->free > 0)
429 return LPROPS_FREE;
430 }
431
432 return LPROPS_UNCAT;
433}
434
435/**
436 * change_category - change LEB properties category.
437 * @c: UBIFS file-system description object
Heiko Schocherff94bc42014-06-24 10:10:04 +0200438 * @lprops: LEB properties to re-categorize
Stefan Roese9eefe2a2009-03-19 15:35:05 +0100439 *
440 * LEB properties are categorized to enable fast find operations. When the LEB
Heiko Schocherff94bc42014-06-24 10:10:04 +0200441 * properties change they must be re-categorized.
Stefan Roese9eefe2a2009-03-19 15:35:05 +0100442 */
443static void change_category(struct ubifs_info *c, struct ubifs_lprops *lprops)
444{
445 int old_cat = lprops->flags & LPROPS_CAT_MASK;
446 int new_cat = ubifs_categorize_lprops(c, lprops);
447
448 if (old_cat == new_cat) {
Heiko Schocherff94bc42014-06-24 10:10:04 +0200449 struct ubifs_lpt_heap *heap;
Stefan Roese9eefe2a2009-03-19 15:35:05 +0100450
451 /* lprops on a heap now must be moved up or down */
452 if (new_cat < 1 || new_cat > LPROPS_HEAP_CNT)
453 return; /* Not on a heap */
454 heap = &c->lpt_heap[new_cat - 1];
455 adjust_lpt_heap(c, heap, lprops, lprops->hpos, new_cat);
456 } else {
457 ubifs_remove_from_cat(c, lprops, old_cat);
458 ubifs_add_to_cat(c, lprops, new_cat);
459 }
460}
461
462/**
Heiko Schocherff94bc42014-06-24 10:10:04 +0200463 * ubifs_calc_dark - calculate LEB dark space size.
Stefan Roese9eefe2a2009-03-19 15:35:05 +0100464 * @c: the UBIFS file-system description object
465 * @spc: amount of free and dirty space in the LEB
466 *
Heiko Schocherff94bc42014-06-24 10:10:04 +0200467 * This function calculates and returns amount of dark space in an LEB which
468 * has @spc bytes of free and dirty space.
Stefan Roese9eefe2a2009-03-19 15:35:05 +0100469 *
Heiko Schocherff94bc42014-06-24 10:10:04 +0200470 * UBIFS is trying to account the space which might not be usable, and this
471 * space is called "dark space". For example, if an LEB has only %512 free
472 * bytes, it is dark space, because it cannot fit a large data node.
Stefan Roese9eefe2a2009-03-19 15:35:05 +0100473 */
Heiko Schocherff94bc42014-06-24 10:10:04 +0200474int ubifs_calc_dark(const struct ubifs_info *c, int spc)
Stefan Roese9eefe2a2009-03-19 15:35:05 +0100475{
476 ubifs_assert(!(spc & 7));
477
478 if (spc < c->dark_wm)
479 return spc;
480
481 /*
482 * If we have slightly more space then the dark space watermark, we can
483 * anyway safely assume it we'll be able to write a node of the
484 * smallest size there.
485 */
486 if (spc - c->dark_wm < MIN_WRITE_SZ)
487 return spc - MIN_WRITE_SZ;
488
489 return c->dark_wm;
490}
491
492/**
493 * is_lprops_dirty - determine if LEB properties are dirty.
494 * @c: the UBIFS file-system description object
495 * @lprops: LEB properties to test
496 */
497static int is_lprops_dirty(struct ubifs_info *c, struct ubifs_lprops *lprops)
498{
499 struct ubifs_pnode *pnode;
500 int pos;
501
502 pos = (lprops->lnum - c->main_first) & (UBIFS_LPT_FANOUT - 1);
503 pnode = (struct ubifs_pnode *)container_of(lprops - pos,
504 struct ubifs_pnode,
505 lprops[0]);
Heiko Schocherff94bc42014-06-24 10:10:04 +0200506 return !test_bit(COW_CNODE, &pnode->flags) &&
Stefan Roese9eefe2a2009-03-19 15:35:05 +0100507 test_bit(DIRTY_CNODE, &pnode->flags);
508}
509
510/**
511 * ubifs_change_lp - change LEB properties.
512 * @c: the UBIFS file-system description object
513 * @lp: LEB properties to change
514 * @free: new free space amount
515 * @dirty: new dirty space amount
516 * @flags: new flags
Heiko Schocherff94bc42014-06-24 10:10:04 +0200517 * @idx_gc_cnt: change to the count of @idx_gc list
Stefan Roese9eefe2a2009-03-19 15:35:05 +0100518 *
519 * This function changes LEB properties (@free, @dirty or @flag). However, the
520 * property which has the %LPROPS_NC value is not changed. Returns a pointer to
521 * the updated LEB properties on success and a negative error code on failure.
522 *
523 * Note, the LEB properties may have had to be copied (due to COW) and
524 * consequently the pointer returned may not be the same as the pointer
525 * passed.
526 */
527const struct ubifs_lprops *ubifs_change_lp(struct ubifs_info *c,
528 const struct ubifs_lprops *lp,
529 int free, int dirty, int flags,
530 int idx_gc_cnt)
531{
532 /*
533 * This is the only function that is allowed to change lprops, so we
Heiko Schocherff94bc42014-06-24 10:10:04 +0200534 * discard the "const" qualifier.
Stefan Roese9eefe2a2009-03-19 15:35:05 +0100535 */
536 struct ubifs_lprops *lprops = (struct ubifs_lprops *)lp;
537
538 dbg_lp("LEB %d, free %d, dirty %d, flags %d",
539 lprops->lnum, free, dirty, flags);
540
541 ubifs_assert(mutex_is_locked(&c->lp_mutex));
542 ubifs_assert(c->lst.empty_lebs >= 0 &&
543 c->lst.empty_lebs <= c->main_lebs);
544 ubifs_assert(c->freeable_cnt >= 0);
545 ubifs_assert(c->freeable_cnt <= c->main_lebs);
546 ubifs_assert(c->lst.taken_empty_lebs >= 0);
547 ubifs_assert(c->lst.taken_empty_lebs <= c->lst.empty_lebs);
548 ubifs_assert(!(c->lst.total_free & 7) && !(c->lst.total_dirty & 7));
549 ubifs_assert(!(c->lst.total_dead & 7) && !(c->lst.total_dark & 7));
550 ubifs_assert(!(c->lst.total_used & 7));
551 ubifs_assert(free == LPROPS_NC || free >= 0);
552 ubifs_assert(dirty == LPROPS_NC || dirty >= 0);
553
554 if (!is_lprops_dirty(c, lprops)) {
555 lprops = ubifs_lpt_lookup_dirty(c, lprops->lnum);
556 if (IS_ERR(lprops))
557 return lprops;
558 } else
559 ubifs_assert(lprops == ubifs_lpt_lookup_dirty(c, lprops->lnum));
560
561 ubifs_assert(!(lprops->free & 7) && !(lprops->dirty & 7));
562
563 spin_lock(&c->space_lock);
564 if ((lprops->flags & LPROPS_TAKEN) && lprops->free == c->leb_size)
565 c->lst.taken_empty_lebs -= 1;
566
567 if (!(lprops->flags & LPROPS_INDEX)) {
568 int old_spc;
569
570 old_spc = lprops->free + lprops->dirty;
571 if (old_spc < c->dead_wm)
572 c->lst.total_dead -= old_spc;
573 else
Heiko Schocherff94bc42014-06-24 10:10:04 +0200574 c->lst.total_dark -= ubifs_calc_dark(c, old_spc);
Stefan Roese9eefe2a2009-03-19 15:35:05 +0100575
576 c->lst.total_used -= c->leb_size - old_spc;
577 }
578
579 if (free != LPROPS_NC) {
580 free = ALIGN(free, 8);
581 c->lst.total_free += free - lprops->free;
582
583 /* Increase or decrease empty LEBs counter if needed */
584 if (free == c->leb_size) {
585 if (lprops->free != c->leb_size)
586 c->lst.empty_lebs += 1;
587 } else if (lprops->free == c->leb_size)
588 c->lst.empty_lebs -= 1;
589 lprops->free = free;
590 }
591
592 if (dirty != LPROPS_NC) {
593 dirty = ALIGN(dirty, 8);
594 c->lst.total_dirty += dirty - lprops->dirty;
595 lprops->dirty = dirty;
596 }
597
598 if (flags != LPROPS_NC) {
599 /* Take care about indexing LEBs counter if needed */
600 if ((lprops->flags & LPROPS_INDEX)) {
601 if (!(flags & LPROPS_INDEX))
602 c->lst.idx_lebs -= 1;
603 } else if (flags & LPROPS_INDEX)
604 c->lst.idx_lebs += 1;
605 lprops->flags = flags;
606 }
607
608 if (!(lprops->flags & LPROPS_INDEX)) {
609 int new_spc;
610
611 new_spc = lprops->free + lprops->dirty;
612 if (new_spc < c->dead_wm)
613 c->lst.total_dead += new_spc;
614 else
Heiko Schocherff94bc42014-06-24 10:10:04 +0200615 c->lst.total_dark += ubifs_calc_dark(c, new_spc);
Stefan Roese9eefe2a2009-03-19 15:35:05 +0100616
617 c->lst.total_used += c->leb_size - new_spc;
618 }
619
620 if ((lprops->flags & LPROPS_TAKEN) && lprops->free == c->leb_size)
621 c->lst.taken_empty_lebs += 1;
622
623 change_category(c, lprops);
624 c->idx_gc_cnt += idx_gc_cnt;
625 spin_unlock(&c->space_lock);
626 return lprops;
627}
628
629/**
630 * ubifs_get_lp_stats - get lprops statistics.
631 * @c: UBIFS file-system description object
632 * @st: return statistics
633 */
634void ubifs_get_lp_stats(struct ubifs_info *c, struct ubifs_lp_stats *lst)
635{
636 spin_lock(&c->space_lock);
637 memcpy(lst, &c->lst, sizeof(struct ubifs_lp_stats));
638 spin_unlock(&c->space_lock);
639}
640
641/**
642 * ubifs_change_one_lp - change LEB properties.
643 * @c: the UBIFS file-system description object
644 * @lnum: LEB to change properties for
645 * @free: amount of free space
646 * @dirty: amount of dirty space
647 * @flags_set: flags to set
648 * @flags_clean: flags to clean
649 * @idx_gc_cnt: change to the count of idx_gc list
650 *
651 * This function changes properties of LEB @lnum. It is a helper wrapper over
652 * 'ubifs_change_lp()' which hides lprops get/release. The arguments are the
653 * same as in case of 'ubifs_change_lp()'. Returns zero in case of success and
654 * a negative error code in case of failure.
655 */
656int ubifs_change_one_lp(struct ubifs_info *c, int lnum, int free, int dirty,
657 int flags_set, int flags_clean, int idx_gc_cnt)
658{
659 int err = 0, flags;
660 const struct ubifs_lprops *lp;
661
662 ubifs_get_lprops(c);
663
664 lp = ubifs_lpt_lookup_dirty(c, lnum);
665 if (IS_ERR(lp)) {
666 err = PTR_ERR(lp);
667 goto out;
668 }
669
670 flags = (lp->flags | flags_set) & ~flags_clean;
671 lp = ubifs_change_lp(c, lp, free, dirty, flags, idx_gc_cnt);
672 if (IS_ERR(lp))
673 err = PTR_ERR(lp);
674
675out:
676 ubifs_release_lprops(c);
Heiko Schocherff94bc42014-06-24 10:10:04 +0200677 if (err)
Heiko Schocher0195a7b2015-10-22 06:19:21 +0200678 ubifs_err(c, "cannot change properties of LEB %d, error %d",
Heiko Schocherff94bc42014-06-24 10:10:04 +0200679 lnum, err);
Stefan Roese9eefe2a2009-03-19 15:35:05 +0100680 return err;
681}
682
683/**
684 * ubifs_update_one_lp - update LEB properties.
685 * @c: the UBIFS file-system description object
686 * @lnum: LEB to change properties for
687 * @free: amount of free space
688 * @dirty: amount of dirty space to add
689 * @flags_set: flags to set
690 * @flags_clean: flags to clean
691 *
692 * This function is the same as 'ubifs_change_one_lp()' but @dirty is added to
693 * current dirty space, not substitutes it.
694 */
695int ubifs_update_one_lp(struct ubifs_info *c, int lnum, int free, int dirty,
696 int flags_set, int flags_clean)
697{
698 int err = 0, flags;
699 const struct ubifs_lprops *lp;
700
701 ubifs_get_lprops(c);
702
703 lp = ubifs_lpt_lookup_dirty(c, lnum);
704 if (IS_ERR(lp)) {
705 err = PTR_ERR(lp);
706 goto out;
707 }
708
709 flags = (lp->flags | flags_set) & ~flags_clean;
710 lp = ubifs_change_lp(c, lp, free, lp->dirty + dirty, flags, 0);
711 if (IS_ERR(lp))
712 err = PTR_ERR(lp);
713
714out:
715 ubifs_release_lprops(c);
Heiko Schocherff94bc42014-06-24 10:10:04 +0200716 if (err)
Heiko Schocher0195a7b2015-10-22 06:19:21 +0200717 ubifs_err(c, "cannot update properties of LEB %d, error %d",
Heiko Schocherff94bc42014-06-24 10:10:04 +0200718 lnum, err);
Stefan Roese9eefe2a2009-03-19 15:35:05 +0100719 return err;
720}
721
722/**
723 * ubifs_read_one_lp - read LEB properties.
724 * @c: the UBIFS file-system description object
725 * @lnum: LEB to read properties for
726 * @lp: where to store read properties
727 *
728 * This helper function reads properties of a LEB @lnum and stores them in @lp.
729 * Returns zero in case of success and a negative error code in case of
730 * failure.
731 */
732int ubifs_read_one_lp(struct ubifs_info *c, int lnum, struct ubifs_lprops *lp)
733{
734 int err = 0;
735 const struct ubifs_lprops *lpp;
736
737 ubifs_get_lprops(c);
738
739 lpp = ubifs_lpt_lookup(c, lnum);
740 if (IS_ERR(lpp)) {
741 err = PTR_ERR(lpp);
Heiko Schocher0195a7b2015-10-22 06:19:21 +0200742 ubifs_err(c, "cannot read properties of LEB %d, error %d",
Heiko Schocherff94bc42014-06-24 10:10:04 +0200743 lnum, err);
Stefan Roese9eefe2a2009-03-19 15:35:05 +0100744 goto out;
745 }
746
747 memcpy(lp, lpp, sizeof(struct ubifs_lprops));
748
749out:
750 ubifs_release_lprops(c);
751 return err;
752}
753
754/**
755 * ubifs_fast_find_free - try to find a LEB with free space quickly.
756 * @c: the UBIFS file-system description object
757 *
758 * This function returns LEB properties for a LEB with free space or %NULL if
759 * the function is unable to find a LEB quickly.
760 */
761const struct ubifs_lprops *ubifs_fast_find_free(struct ubifs_info *c)
762{
763 struct ubifs_lprops *lprops;
764 struct ubifs_lpt_heap *heap;
765
766 ubifs_assert(mutex_is_locked(&c->lp_mutex));
767
768 heap = &c->lpt_heap[LPROPS_FREE - 1];
769 if (heap->cnt == 0)
770 return NULL;
771
772 lprops = heap->arr[0];
773 ubifs_assert(!(lprops->flags & LPROPS_TAKEN));
774 ubifs_assert(!(lprops->flags & LPROPS_INDEX));
775 return lprops;
776}
777
778/**
779 * ubifs_fast_find_empty - try to find an empty LEB quickly.
780 * @c: the UBIFS file-system description object
781 *
782 * This function returns LEB properties for an empty LEB or %NULL if the
783 * function is unable to find an empty LEB quickly.
784 */
785const struct ubifs_lprops *ubifs_fast_find_empty(struct ubifs_info *c)
786{
787 struct ubifs_lprops *lprops;
788
789 ubifs_assert(mutex_is_locked(&c->lp_mutex));
790
791 if (list_empty(&c->empty_list))
792 return NULL;
793
794 lprops = list_entry(c->empty_list.next, struct ubifs_lprops, list);
795 ubifs_assert(!(lprops->flags & LPROPS_TAKEN));
796 ubifs_assert(!(lprops->flags & LPROPS_INDEX));
797 ubifs_assert(lprops->free == c->leb_size);
798 return lprops;
799}
800
801/**
802 * ubifs_fast_find_freeable - try to find a freeable LEB quickly.
803 * @c: the UBIFS file-system description object
804 *
805 * This function returns LEB properties for a freeable LEB or %NULL if the
806 * function is unable to find a freeable LEB quickly.
807 */
808const struct ubifs_lprops *ubifs_fast_find_freeable(struct ubifs_info *c)
809{
810 struct ubifs_lprops *lprops;
811
812 ubifs_assert(mutex_is_locked(&c->lp_mutex));
813
814 if (list_empty(&c->freeable_list))
815 return NULL;
816
817 lprops = list_entry(c->freeable_list.next, struct ubifs_lprops, list);
818 ubifs_assert(!(lprops->flags & LPROPS_TAKEN));
819 ubifs_assert(!(lprops->flags & LPROPS_INDEX));
820 ubifs_assert(lprops->free + lprops->dirty == c->leb_size);
821 ubifs_assert(c->freeable_cnt > 0);
822 return lprops;
823}
824
825/**
826 * ubifs_fast_find_frdi_idx - try to find a freeable index LEB quickly.
827 * @c: the UBIFS file-system description object
828 *
829 * This function returns LEB properties for a freeable index LEB or %NULL if the
830 * function is unable to find a freeable index LEB quickly.
831 */
832const struct ubifs_lprops *ubifs_fast_find_frdi_idx(struct ubifs_info *c)
833{
834 struct ubifs_lprops *lprops;
835
836 ubifs_assert(mutex_is_locked(&c->lp_mutex));
837
838 if (list_empty(&c->frdi_idx_list))
839 return NULL;
840
841 lprops = list_entry(c->frdi_idx_list.next, struct ubifs_lprops, list);
842 ubifs_assert(!(lprops->flags & LPROPS_TAKEN));
843 ubifs_assert((lprops->flags & LPROPS_INDEX));
844 ubifs_assert(lprops->free + lprops->dirty == c->leb_size);
845 return lprops;
846}
Heiko Schocherff94bc42014-06-24 10:10:04 +0200847
848/*
849 * Everything below is related to debugging.
850 */
851
852/**
853 * dbg_check_cats - check category heaps and lists.
854 * @c: UBIFS file-system description object
855 *
856 * This function returns %0 on success and a negative error code on failure.
857 */
858int dbg_check_cats(struct ubifs_info *c)
859{
860 struct ubifs_lprops *lprops;
861 struct list_head *pos;
862 int i, cat;
863
864 if (!dbg_is_chk_gen(c) && !dbg_is_chk_lprops(c))
865 return 0;
866
867 list_for_each_entry(lprops, &c->empty_list, list) {
868 if (lprops->free != c->leb_size) {
Heiko Schocher0195a7b2015-10-22 06:19:21 +0200869 ubifs_err(c, "non-empty LEB %d on empty list (free %d dirty %d flags %d)",
Heiko Schocherff94bc42014-06-24 10:10:04 +0200870 lprops->lnum, lprops->free, lprops->dirty,
871 lprops->flags);
872 return -EINVAL;
873 }
874 if (lprops->flags & LPROPS_TAKEN) {
Heiko Schocher0195a7b2015-10-22 06:19:21 +0200875 ubifs_err(c, "taken LEB %d on empty list (free %d dirty %d flags %d)",
Heiko Schocherff94bc42014-06-24 10:10:04 +0200876 lprops->lnum, lprops->free, lprops->dirty,
877 lprops->flags);
878 return -EINVAL;
879 }
880 }
881
882 i = 0;
883 list_for_each_entry(lprops, &c->freeable_list, list) {
884 if (lprops->free + lprops->dirty != c->leb_size) {
Heiko Schocher0195a7b2015-10-22 06:19:21 +0200885 ubifs_err(c, "non-freeable LEB %d on freeable list (free %d dirty %d flags %d)",
Heiko Schocherff94bc42014-06-24 10:10:04 +0200886 lprops->lnum, lprops->free, lprops->dirty,
887 lprops->flags);
888 return -EINVAL;
889 }
890 if (lprops->flags & LPROPS_TAKEN) {
Heiko Schocher0195a7b2015-10-22 06:19:21 +0200891 ubifs_err(c, "taken LEB %d on freeable list (free %d dirty %d flags %d)",
Heiko Schocherff94bc42014-06-24 10:10:04 +0200892 lprops->lnum, lprops->free, lprops->dirty,
893 lprops->flags);
894 return -EINVAL;
895 }
896 i += 1;
897 }
898 if (i != c->freeable_cnt) {
Heiko Schocher0195a7b2015-10-22 06:19:21 +0200899 ubifs_err(c, "freeable list count %d expected %d", i,
Heiko Schocherff94bc42014-06-24 10:10:04 +0200900 c->freeable_cnt);
901 return -EINVAL;
902 }
903
904 i = 0;
905 list_for_each(pos, &c->idx_gc)
906 i += 1;
907 if (i != c->idx_gc_cnt) {
Heiko Schocher0195a7b2015-10-22 06:19:21 +0200908 ubifs_err(c, "idx_gc list count %d expected %d", i,
Heiko Schocherff94bc42014-06-24 10:10:04 +0200909 c->idx_gc_cnt);
910 return -EINVAL;
911 }
912
913 list_for_each_entry(lprops, &c->frdi_idx_list, list) {
914 if (lprops->free + lprops->dirty != c->leb_size) {
Heiko Schocher0195a7b2015-10-22 06:19:21 +0200915 ubifs_err(c, "non-freeable LEB %d on frdi_idx list (free %d dirty %d flags %d)",
Heiko Schocherff94bc42014-06-24 10:10:04 +0200916 lprops->lnum, lprops->free, lprops->dirty,
917 lprops->flags);
918 return -EINVAL;
919 }
920 if (lprops->flags & LPROPS_TAKEN) {
Heiko Schocher0195a7b2015-10-22 06:19:21 +0200921 ubifs_err(c, "taken LEB %d on frdi_idx list (free %d dirty %d flags %d)",
Heiko Schocherff94bc42014-06-24 10:10:04 +0200922 lprops->lnum, lprops->free, lprops->dirty,
923 lprops->flags);
924 return -EINVAL;
925 }
926 if (!(lprops->flags & LPROPS_INDEX)) {
Heiko Schocher0195a7b2015-10-22 06:19:21 +0200927 ubifs_err(c, "non-index LEB %d on frdi_idx list (free %d dirty %d flags %d)",
Heiko Schocherff94bc42014-06-24 10:10:04 +0200928 lprops->lnum, lprops->free, lprops->dirty,
929 lprops->flags);
930 return -EINVAL;
931 }
932 }
933
934 for (cat = 1; cat <= LPROPS_HEAP_CNT; cat++) {
935 struct ubifs_lpt_heap *heap = &c->lpt_heap[cat - 1];
936
937 for (i = 0; i < heap->cnt; i++) {
938 lprops = heap->arr[i];
939 if (!lprops) {
Heiko Schocher0195a7b2015-10-22 06:19:21 +0200940 ubifs_err(c, "null ptr in LPT heap cat %d", cat);
Heiko Schocherff94bc42014-06-24 10:10:04 +0200941 return -EINVAL;
942 }
943 if (lprops->hpos != i) {
Heiko Schocher0195a7b2015-10-22 06:19:21 +0200944 ubifs_err(c, "bad ptr in LPT heap cat %d", cat);
Heiko Schocherff94bc42014-06-24 10:10:04 +0200945 return -EINVAL;
946 }
947 if (lprops->flags & LPROPS_TAKEN) {
Heiko Schocher0195a7b2015-10-22 06:19:21 +0200948 ubifs_err(c, "taken LEB in LPT heap cat %d", cat);
Heiko Schocherff94bc42014-06-24 10:10:04 +0200949 return -EINVAL;
950 }
951 }
952 }
953
954 return 0;
955}
956
957void dbg_check_heap(struct ubifs_info *c, struct ubifs_lpt_heap *heap, int cat,
958 int add_pos)
959{
960 int i = 0, j, err = 0;
961
962 if (!dbg_is_chk_gen(c) && !dbg_is_chk_lprops(c))
963 return;
964
965 for (i = 0; i < heap->cnt; i++) {
966 struct ubifs_lprops *lprops = heap->arr[i];
967 struct ubifs_lprops *lp;
968
969 if (i != add_pos)
970 if ((lprops->flags & LPROPS_CAT_MASK) != cat) {
971 err = 1;
972 goto out;
973 }
974 if (lprops->hpos != i) {
975 err = 2;
976 goto out;
977 }
978 lp = ubifs_lpt_lookup(c, lprops->lnum);
979 if (IS_ERR(lp)) {
980 err = 3;
981 goto out;
982 }
983 if (lprops != lp) {
Heiko Schocher0195a7b2015-10-22 06:19:21 +0200984 ubifs_err(c, "lprops %zx lp %zx lprops->lnum %d lp->lnum %d",
Heiko Schocherff94bc42014-06-24 10:10:04 +0200985 (size_t)lprops, (size_t)lp, lprops->lnum,
986 lp->lnum);
987 err = 4;
988 goto out;
989 }
990 for (j = 0; j < i; j++) {
991 lp = heap->arr[j];
992 if (lp == lprops) {
993 err = 5;
994 goto out;
995 }
996 if (lp->lnum == lprops->lnum) {
997 err = 6;
998 goto out;
999 }
1000 }
1001 }
1002out:
1003 if (err) {
Heiko Schocher0195a7b2015-10-22 06:19:21 +02001004 ubifs_err(c, "failed cat %d hpos %d err %d", cat, i, err);
Heiko Schocherff94bc42014-06-24 10:10:04 +02001005 dump_stack();
1006 ubifs_dump_heap(c, heap, cat);
1007 }
1008}
1009
1010/**
1011 * scan_check_cb - scan callback.
1012 * @c: the UBIFS file-system description object
1013 * @lp: LEB properties to scan
1014 * @in_tree: whether the LEB properties are in main memory
1015 * @lst: lprops statistics to update
1016 *
1017 * This function returns a code that indicates whether the scan should continue
1018 * (%LPT_SCAN_CONTINUE), whether the LEB properties should be added to the tree
1019 * in main memory (%LPT_SCAN_ADD), or whether the scan should stop
1020 * (%LPT_SCAN_STOP).
1021 */
1022static int scan_check_cb(struct ubifs_info *c,
1023 const struct ubifs_lprops *lp, int in_tree,
1024 struct ubifs_lp_stats *lst)
1025{
1026 struct ubifs_scan_leb *sleb;
1027 struct ubifs_scan_node *snod;
Heiko Schocher0195a7b2015-10-22 06:19:21 +02001028 int cat, lnum = lp->lnum, is_idx = 0, used = 0, free, dirty, ret;
Heiko Schocherff94bc42014-06-24 10:10:04 +02001029 void *buf = NULL;
1030
1031 cat = lp->flags & LPROPS_CAT_MASK;
1032 if (cat != LPROPS_UNCAT) {
1033 cat = ubifs_categorize_lprops(c, lp);
1034 if (cat != (lp->flags & LPROPS_CAT_MASK)) {
Heiko Schocher0195a7b2015-10-22 06:19:21 +02001035 ubifs_err(c, "bad LEB category %d expected %d",
Heiko Schocherff94bc42014-06-24 10:10:04 +02001036 (lp->flags & LPROPS_CAT_MASK), cat);
1037 return -EINVAL;
1038 }
1039 }
1040
1041 /* Check lp is on its category list (if it has one) */
1042 if (in_tree) {
1043 struct list_head *list = NULL;
1044
1045 switch (cat) {
1046 case LPROPS_EMPTY:
1047 list = &c->empty_list;
1048 break;
1049 case LPROPS_FREEABLE:
1050 list = &c->freeable_list;
1051 break;
1052 case LPROPS_FRDI_IDX:
1053 list = &c->frdi_idx_list;
1054 break;
1055 case LPROPS_UNCAT:
1056 list = &c->uncat_list;
1057 break;
1058 }
1059 if (list) {
1060 struct ubifs_lprops *lprops;
1061 int found = 0;
1062
1063 list_for_each_entry(lprops, list, list) {
1064 if (lprops == lp) {
1065 found = 1;
1066 break;
1067 }
1068 }
1069 if (!found) {
Heiko Schocher0195a7b2015-10-22 06:19:21 +02001070 ubifs_err(c, "bad LPT list (category %d)", cat);
Heiko Schocherff94bc42014-06-24 10:10:04 +02001071 return -EINVAL;
1072 }
1073 }
1074 }
1075
1076 /* Check lp is on its category heap (if it has one) */
1077 if (in_tree && cat > 0 && cat <= LPROPS_HEAP_CNT) {
1078 struct ubifs_lpt_heap *heap = &c->lpt_heap[cat - 1];
1079
1080 if ((lp->hpos != -1 && heap->arr[lp->hpos]->lnum != lnum) ||
1081 lp != heap->arr[lp->hpos]) {
Heiko Schocher0195a7b2015-10-22 06:19:21 +02001082 ubifs_err(c, "bad LPT heap (category %d)", cat);
Heiko Schocherff94bc42014-06-24 10:10:04 +02001083 return -EINVAL;
1084 }
1085 }
1086
1087 buf = __vmalloc(c->leb_size, GFP_NOFS, PAGE_KERNEL);
1088 if (!buf)
1089 return -ENOMEM;
1090
1091 /*
1092 * After an unclean unmount, empty and freeable LEBs
1093 * may contain garbage - do not scan them.
1094 */
1095 if (lp->free == c->leb_size) {
1096 lst->empty_lebs += 1;
1097 lst->total_free += c->leb_size;
1098 lst->total_dark += ubifs_calc_dark(c, c->leb_size);
1099 return LPT_SCAN_CONTINUE;
1100 }
1101 if (lp->free + lp->dirty == c->leb_size &&
1102 !(lp->flags & LPROPS_INDEX)) {
1103 lst->total_free += lp->free;
1104 lst->total_dirty += lp->dirty;
1105 lst->total_dark += ubifs_calc_dark(c, c->leb_size);
1106 return LPT_SCAN_CONTINUE;
1107 }
1108
1109 sleb = ubifs_scan(c, lnum, 0, buf, 0);
1110 if (IS_ERR(sleb)) {
1111 ret = PTR_ERR(sleb);
1112 if (ret == -EUCLEAN) {
1113 ubifs_dump_lprops(c);
1114 ubifs_dump_budg(c, &c->bi);
1115 }
1116 goto out;
1117 }
1118
1119 is_idx = -1;
1120 list_for_each_entry(snod, &sleb->nodes, list) {
1121 int found, level = 0;
1122
1123 cond_resched();
1124
1125 if (is_idx == -1)
1126 is_idx = (snod->type == UBIFS_IDX_NODE) ? 1 : 0;
1127
1128 if (is_idx && snod->type != UBIFS_IDX_NODE) {
Heiko Schocher0195a7b2015-10-22 06:19:21 +02001129 ubifs_err(c, "indexing node in data LEB %d:%d",
Heiko Schocherff94bc42014-06-24 10:10:04 +02001130 lnum, snod->offs);
1131 goto out_destroy;
1132 }
1133
1134 if (snod->type == UBIFS_IDX_NODE) {
1135 struct ubifs_idx_node *idx = snod->node;
1136
1137 key_read(c, ubifs_idx_key(c, idx), &snod->key);
1138 level = le16_to_cpu(idx->level);
1139 }
1140
1141 found = ubifs_tnc_has_node(c, &snod->key, level, lnum,
1142 snod->offs, is_idx);
1143 if (found) {
1144 if (found < 0)
1145 goto out_destroy;
1146 used += ALIGN(snod->len, 8);
1147 }
1148 }
1149
Heiko Schocher0195a7b2015-10-22 06:19:21 +02001150 free = c->leb_size - sleb->endpt;
Heiko Schocherff94bc42014-06-24 10:10:04 +02001151 dirty = sleb->endpt - used;
1152
Heiko Schocher0195a7b2015-10-22 06:19:21 +02001153 if (free > c->leb_size || free < 0 || dirty > c->leb_size ||
Heiko Schocherff94bc42014-06-24 10:10:04 +02001154 dirty < 0) {
Heiko Schocher0195a7b2015-10-22 06:19:21 +02001155 ubifs_err(c, "bad calculated accounting for LEB %d: free %d, dirty %d",
1156 lnum, free, dirty);
Heiko Schocherff94bc42014-06-24 10:10:04 +02001157 goto out_destroy;
1158 }
1159
1160 if (lp->free + lp->dirty == c->leb_size &&
Heiko Schocher0195a7b2015-10-22 06:19:21 +02001161 free + dirty == c->leb_size)
Heiko Schocherff94bc42014-06-24 10:10:04 +02001162 if ((is_idx && !(lp->flags & LPROPS_INDEX)) ||
Heiko Schocher0195a7b2015-10-22 06:19:21 +02001163 (!is_idx && free == c->leb_size) ||
Heiko Schocherff94bc42014-06-24 10:10:04 +02001164 lp->free == c->leb_size) {
1165 /*
1166 * Empty or freeable LEBs could contain index
1167 * nodes from an uncompleted commit due to an
1168 * unclean unmount. Or they could be empty for
1169 * the same reason. Or it may simply not have been
1170 * unmapped.
1171 */
Heiko Schocher0195a7b2015-10-22 06:19:21 +02001172 free = lp->free;
Heiko Schocherff94bc42014-06-24 10:10:04 +02001173 dirty = lp->dirty;
1174 is_idx = 0;
1175 }
1176
Heiko Schocher0195a7b2015-10-22 06:19:21 +02001177 if (is_idx && lp->free + lp->dirty == free + dirty &&
Heiko Schocherff94bc42014-06-24 10:10:04 +02001178 lnum != c->ihead_lnum) {
1179 /*
1180 * After an unclean unmount, an index LEB could have a different
1181 * amount of free space than the value recorded by lprops. That
1182 * is because the in-the-gaps method may use free space or
1183 * create free space (as a side-effect of using ubi_leb_change
1184 * and not writing the whole LEB). The incorrect free space
1185 * value is not a problem because the index is only ever
1186 * allocated empty LEBs, so there will never be an attempt to
1187 * write to the free space at the end of an index LEB - except
1188 * by the in-the-gaps method for which it is not a problem.
1189 */
Heiko Schocher0195a7b2015-10-22 06:19:21 +02001190 free = lp->free;
Heiko Schocherff94bc42014-06-24 10:10:04 +02001191 dirty = lp->dirty;
1192 }
1193
Heiko Schocher0195a7b2015-10-22 06:19:21 +02001194 if (lp->free != free || lp->dirty != dirty)
Heiko Schocherff94bc42014-06-24 10:10:04 +02001195 goto out_print;
1196
1197 if (is_idx && !(lp->flags & LPROPS_INDEX)) {
Heiko Schocher0195a7b2015-10-22 06:19:21 +02001198 if (free == c->leb_size)
Heiko Schocherff94bc42014-06-24 10:10:04 +02001199 /* Free but not unmapped LEB, it's fine */
1200 is_idx = 0;
1201 else {
Heiko Schocher0195a7b2015-10-22 06:19:21 +02001202 ubifs_err(c, "indexing node without indexing flag");
Heiko Schocherff94bc42014-06-24 10:10:04 +02001203 goto out_print;
1204 }
1205 }
1206
1207 if (!is_idx && (lp->flags & LPROPS_INDEX)) {
Heiko Schocher0195a7b2015-10-22 06:19:21 +02001208 ubifs_err(c, "data node with indexing flag");
Heiko Schocherff94bc42014-06-24 10:10:04 +02001209 goto out_print;
1210 }
1211
Heiko Schocher0195a7b2015-10-22 06:19:21 +02001212 if (free == c->leb_size)
Heiko Schocherff94bc42014-06-24 10:10:04 +02001213 lst->empty_lebs += 1;
1214
1215 if (is_idx)
1216 lst->idx_lebs += 1;
1217
1218 if (!(lp->flags & LPROPS_INDEX))
Heiko Schocher0195a7b2015-10-22 06:19:21 +02001219 lst->total_used += c->leb_size - free - dirty;
1220 lst->total_free += free;
Heiko Schocherff94bc42014-06-24 10:10:04 +02001221 lst->total_dirty += dirty;
1222
1223 if (!(lp->flags & LPROPS_INDEX)) {
Heiko Schocher0195a7b2015-10-22 06:19:21 +02001224 int spc = free + dirty;
Heiko Schocherff94bc42014-06-24 10:10:04 +02001225
1226 if (spc < c->dead_wm)
1227 lst->total_dead += spc;
1228 else
1229 lst->total_dark += ubifs_calc_dark(c, spc);
1230 }
1231
1232 ubifs_scan_destroy(sleb);
1233 vfree(buf);
1234 return LPT_SCAN_CONTINUE;
1235
1236out_print:
Heiko Schocher0195a7b2015-10-22 06:19:21 +02001237 ubifs_err(c, "bad accounting of LEB %d: free %d, dirty %d flags %#x, should be free %d, dirty %d",
1238 lnum, lp->free, lp->dirty, lp->flags, free, dirty);
Heiko Schocherff94bc42014-06-24 10:10:04 +02001239 ubifs_dump_leb(c, lnum);
1240out_destroy:
1241 ubifs_scan_destroy(sleb);
1242 ret = -EINVAL;
1243out:
1244 vfree(buf);
1245 return ret;
1246}
1247
1248/**
1249 * dbg_check_lprops - check all LEB properties.
1250 * @c: UBIFS file-system description object
1251 *
1252 * This function checks all LEB properties and makes sure they are all correct.
1253 * It returns zero if everything is fine, %-EINVAL if there is an inconsistency
1254 * and other negative error codes in case of other errors. This function is
1255 * called while the file system is locked (because of commit start), so no
1256 * additional locking is required. Note that locking the LPT mutex would cause
1257 * a circular lock dependency with the TNC mutex.
1258 */
1259int dbg_check_lprops(struct ubifs_info *c)
1260{
1261 int i, err;
1262 struct ubifs_lp_stats lst;
1263
1264 if (!dbg_is_chk_lprops(c))
1265 return 0;
1266
1267 /*
1268 * As we are going to scan the media, the write buffers have to be
1269 * synchronized.
1270 */
1271 for (i = 0; i < c->jhead_cnt; i++) {
1272 err = ubifs_wbuf_sync(&c->jheads[i].wbuf);
1273 if (err)
1274 return err;
1275 }
1276
1277 memset(&lst, 0, sizeof(struct ubifs_lp_stats));
1278 err = ubifs_lpt_scan_nolock(c, c->main_first, c->leb_cnt - 1,
1279 (ubifs_lpt_scan_callback)scan_check_cb,
1280 &lst);
1281 if (err && err != -ENOSPC)
1282 goto out;
1283
1284 if (lst.empty_lebs != c->lst.empty_lebs ||
1285 lst.idx_lebs != c->lst.idx_lebs ||
1286 lst.total_free != c->lst.total_free ||
1287 lst.total_dirty != c->lst.total_dirty ||
1288 lst.total_used != c->lst.total_used) {
Heiko Schocher0195a7b2015-10-22 06:19:21 +02001289 ubifs_err(c, "bad overall accounting");
1290 ubifs_err(c, "calculated: empty_lebs %d, idx_lebs %d, total_free %lld, total_dirty %lld, total_used %lld",
Heiko Schocherff94bc42014-06-24 10:10:04 +02001291 lst.empty_lebs, lst.idx_lebs, lst.total_free,
1292 lst.total_dirty, lst.total_used);
Heiko Schocher0195a7b2015-10-22 06:19:21 +02001293 ubifs_err(c, "read from lprops: empty_lebs %d, idx_lebs %d, total_free %lld, total_dirty %lld, total_used %lld",
Heiko Schocherff94bc42014-06-24 10:10:04 +02001294 c->lst.empty_lebs, c->lst.idx_lebs, c->lst.total_free,
1295 c->lst.total_dirty, c->lst.total_used);
1296 err = -EINVAL;
1297 goto out;
1298 }
1299
1300 if (lst.total_dead != c->lst.total_dead ||
1301 lst.total_dark != c->lst.total_dark) {
Heiko Schocher0195a7b2015-10-22 06:19:21 +02001302 ubifs_err(c, "bad dead/dark space accounting");
1303 ubifs_err(c, "calculated: total_dead %lld, total_dark %lld",
Heiko Schocherff94bc42014-06-24 10:10:04 +02001304 lst.total_dead, lst.total_dark);
Heiko Schocher0195a7b2015-10-22 06:19:21 +02001305 ubifs_err(c, "read from lprops: total_dead %lld, total_dark %lld",
Heiko Schocherff94bc42014-06-24 10:10:04 +02001306 c->lst.total_dead, c->lst.total_dark);
1307 err = -EINVAL;
1308 goto out;
1309 }
1310
1311 err = dbg_check_cats(c);
1312out:
1313 return err;
1314}