2 * This file is part of UBIFS.
4 * Copyright (C) 2006-2008 Nokia Corporation.
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.
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
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
19 * Authors: Adrian Hunter
20 * Artem Bityutskiy (Битюцкий Артём)
24 * This file implements the functions that access LEB properties and their
25 * categories. LEBs are categorized based on the needs of UBIFS, and the
26 * categories are stored as either heaps or lists to provide a fast way of
27 * finding a LEB in a particular category. For example, UBIFS may need to find
28 * an empty LEB for the journal, or a very dirty LEB for garbage collection.
34 * get_heap_comp_val - get the LEB properties value for heap comparisons.
35 * @lprops: LEB properties
38 static int get_heap_comp_val(struct ubifs_lprops *lprops, int cat)
43 case LPROPS_DIRTY_IDX:
44 return lprops->free + lprops->dirty;
51 * move_up_lpt_heap - move a new heap entry up as far as possible.
52 * @c: UBIFS file-system description object
53 * @heap: LEB category heap
54 * @lprops: LEB properties to move
57 * New entries to a heap are added at the bottom and then moved up until the
58 * parent's value is greater. In the case of LPT's category heaps, the value
59 * is either the amount of free space or the amount of dirty space, depending
62 static void move_up_lpt_heap(struct ubifs_info *c, struct ubifs_lpt_heap *heap,
63 struct ubifs_lprops *lprops, int cat)
69 return; /* Already top of the heap */
70 val1 = get_heap_comp_val(lprops, cat);
71 /* Compare to parent and, if greater, move up the heap */
73 int ppos = (hpos - 1) / 2;
75 val2 = get_heap_comp_val(heap->arr[ppos], cat);
78 /* Greater than parent so move up */
79 heap->arr[ppos]->hpos = hpos;
80 heap->arr[hpos] = heap->arr[ppos];
81 heap->arr[ppos] = lprops;
88 * adjust_lpt_heap - move a changed heap entry up or down the heap.
89 * @c: UBIFS file-system description object
90 * @heap: LEB category heap
91 * @lprops: LEB properties to move
92 * @hpos: heap position of @lprops
95 * Changed entries in a heap are moved up or down until the parent's value is
96 * greater. In the case of LPT's category heaps, the value is either the amount
97 * of free space or the amount of dirty space, depending on the category.
99 static void adjust_lpt_heap(struct ubifs_info *c, struct ubifs_lpt_heap *heap,
100 struct ubifs_lprops *lprops, int hpos, int cat)
102 int val1, val2, val3, cpos;
104 val1 = get_heap_comp_val(lprops, cat);
105 /* Compare to parent and, if greater than parent, move up the heap */
107 int ppos = (hpos - 1) / 2;
109 val2 = get_heap_comp_val(heap->arr[ppos], cat);
111 /* Greater than parent so move up */
113 heap->arr[ppos]->hpos = hpos;
114 heap->arr[hpos] = heap->arr[ppos];
115 heap->arr[ppos] = lprops;
120 ppos = (hpos - 1) / 2;
121 val2 = get_heap_comp_val(heap->arr[ppos], cat);
124 /* Still greater than parent so keep going */
129 /* Not greater than parent, so compare to children */
131 /* Compare to left child */
133 if (cpos >= heap->cnt)
135 val2 = get_heap_comp_val(heap->arr[cpos], cat);
137 /* Less than left child, so promote biggest child */
138 if (cpos + 1 < heap->cnt) {
139 val3 = get_heap_comp_val(heap->arr[cpos + 1],
142 cpos += 1; /* Right child is bigger */
144 heap->arr[cpos]->hpos = hpos;
145 heap->arr[hpos] = heap->arr[cpos];
146 heap->arr[cpos] = lprops;
151 /* Compare to right child */
153 if (cpos >= heap->cnt)
155 val3 = get_heap_comp_val(heap->arr[cpos], cat);
157 /* Less than right child, so promote right child */
158 heap->arr[cpos]->hpos = hpos;
159 heap->arr[hpos] = heap->arr[cpos];
160 heap->arr[cpos] = lprops;
170 * add_to_lpt_heap - add LEB properties to a LEB category heap.
171 * @c: UBIFS file-system description object
172 * @lprops: LEB properties to add
175 * This function returns %1 if @lprops is added to the heap for LEB category
176 * @cat, otherwise %0 is returned because the heap is full.
178 static int add_to_lpt_heap(struct ubifs_info *c, struct ubifs_lprops *lprops,
181 struct ubifs_lpt_heap *heap = &c->lpt_heap[cat - 1];
183 if (heap->cnt >= heap->max_cnt) {
184 const int b = LPT_HEAP_SZ / 2 - 1;
185 int cpos, val1, val2;
187 /* Compare to some other LEB on the bottom of heap */
188 /* Pick a position kind of randomly */
189 cpos = (((size_t)lprops >> 4) & b) + b;
190 ubifs_assert(cpos >= b);
191 ubifs_assert(cpos < LPT_HEAP_SZ);
192 ubifs_assert(cpos < heap->cnt);
194 val1 = get_heap_comp_val(lprops, cat);
195 val2 = get_heap_comp_val(heap->arr[cpos], cat);
197 struct ubifs_lprops *lp;
199 lp = heap->arr[cpos];
200 lp->flags &= ~LPROPS_CAT_MASK;
201 lp->flags |= LPROPS_UNCAT;
202 list_add(&lp->list, &c->uncat_list);
204 heap->arr[cpos] = lprops;
205 move_up_lpt_heap(c, heap, lprops, cat);
206 dbg_check_heap(c, heap, cat, lprops->hpos);
207 return 1; /* Added to heap */
209 dbg_check_heap(c, heap, cat, -1);
210 return 0; /* Not added to heap */
212 lprops->hpos = heap->cnt++;
213 heap->arr[lprops->hpos] = lprops;
214 move_up_lpt_heap(c, heap, lprops, cat);
215 dbg_check_heap(c, heap, cat, lprops->hpos);
216 return 1; /* Added to heap */
221 * remove_from_lpt_heap - remove LEB properties from a LEB category heap.
222 * @c: UBIFS file-system description object
223 * @lprops: LEB properties to remove
226 static void remove_from_lpt_heap(struct ubifs_info *c,
227 struct ubifs_lprops *lprops, int cat)
229 struct ubifs_lpt_heap *heap;
230 int hpos = lprops->hpos;
232 heap = &c->lpt_heap[cat - 1];
233 ubifs_assert(hpos >= 0 && hpos < heap->cnt);
234 ubifs_assert(heap->arr[hpos] == lprops);
236 if (hpos < heap->cnt) {
237 heap->arr[hpos] = heap->arr[heap->cnt];
238 heap->arr[hpos]->hpos = hpos;
239 adjust_lpt_heap(c, heap, heap->arr[hpos], hpos, cat);
241 dbg_check_heap(c, heap, cat, -1);
245 * lpt_heap_replace - replace lprops in a category heap.
246 * @c: UBIFS file-system description object
247 * @old_lprops: LEB properties to replace
248 * @new_lprops: LEB properties with which to replace
251 * During commit it is sometimes necessary to copy a pnode (see dirty_cow_pnode)
252 * and the lprops that the pnode contains. When that happens, references in
253 * the category heaps to those lprops must be updated to point to the new
254 * lprops. This function does that.
256 static void lpt_heap_replace(struct ubifs_info *c,
257 struct ubifs_lprops *old_lprops,
258 struct ubifs_lprops *new_lprops, int cat)
260 struct ubifs_lpt_heap *heap;
261 int hpos = new_lprops->hpos;
263 heap = &c->lpt_heap[cat - 1];
264 heap->arr[hpos] = new_lprops;
268 * ubifs_add_to_cat - add LEB properties to a category list or heap.
269 * @c: UBIFS file-system description object
270 * @lprops: LEB properties to add
271 * @cat: LEB category to which to add
273 * LEB properties are categorized to enable fast find operations.
275 void ubifs_add_to_cat(struct ubifs_info *c, struct ubifs_lprops *lprops,
280 case LPROPS_DIRTY_IDX:
282 if (add_to_lpt_heap(c, lprops, cat))
284 /* No more room on heap so make it un-categorized */
288 list_add(&lprops->list, &c->uncat_list);
291 list_add(&lprops->list, &c->empty_list);
293 case LPROPS_FREEABLE:
294 list_add(&lprops->list, &c->freeable_list);
295 c->freeable_cnt += 1;
297 case LPROPS_FRDI_IDX:
298 list_add(&lprops->list, &c->frdi_idx_list);
303 lprops->flags &= ~LPROPS_CAT_MASK;
304 lprops->flags |= cat;
308 * ubifs_remove_from_cat - remove LEB properties from a category list or heap.
309 * @c: UBIFS file-system description object
310 * @lprops: LEB properties to remove
311 * @cat: LEB category from which to remove
313 * LEB properties are categorized to enable fast find operations.
315 static void ubifs_remove_from_cat(struct ubifs_info *c,
316 struct ubifs_lprops *lprops, int cat)
320 case LPROPS_DIRTY_IDX:
322 remove_from_lpt_heap(c, lprops, cat);
324 case LPROPS_FREEABLE:
325 c->freeable_cnt -= 1;
326 ubifs_assert(c->freeable_cnt >= 0);
330 case LPROPS_FRDI_IDX:
331 ubifs_assert(!list_empty(&lprops->list));
332 list_del(&lprops->list);
340 * ubifs_replace_cat - replace lprops in a category list or heap.
341 * @c: UBIFS file-system description object
342 * @old_lprops: LEB properties to replace
343 * @new_lprops: LEB properties with which to replace
345 * During commit it is sometimes necessary to copy a pnode (see dirty_cow_pnode)
346 * and the lprops that the pnode contains. When that happens, references in
347 * category lists and heaps must be replaced. This function does that.
349 void ubifs_replace_cat(struct ubifs_info *c, struct ubifs_lprops *old_lprops,
350 struct ubifs_lprops *new_lprops)
354 cat = new_lprops->flags & LPROPS_CAT_MASK;
357 case LPROPS_DIRTY_IDX:
359 lpt_heap_replace(c, old_lprops, new_lprops, cat);
363 case LPROPS_FREEABLE:
364 case LPROPS_FRDI_IDX:
365 list_replace(&old_lprops->list, &new_lprops->list);
373 * ubifs_ensure_cat - ensure LEB properties are categorized.
374 * @c: UBIFS file-system description object
375 * @lprops: LEB properties
377 * A LEB may have fallen off of the bottom of a heap, and ended up as
378 * un-categorized even though it has enough space for us now. If that is the
379 * case this function will put the LEB back onto a heap.
381 void ubifs_ensure_cat(struct ubifs_info *c, struct ubifs_lprops *lprops)
383 int cat = lprops->flags & LPROPS_CAT_MASK;
385 if (cat != LPROPS_UNCAT)
387 cat = ubifs_categorize_lprops(c, lprops);
388 if (cat == LPROPS_UNCAT)
390 ubifs_remove_from_cat(c, lprops, LPROPS_UNCAT);
391 ubifs_add_to_cat(c, lprops, cat);
395 * ubifs_categorize_lprops - categorize LEB properties.
396 * @c: UBIFS file-system description object
397 * @lprops: LEB properties to categorize
399 * LEB properties are categorized to enable fast find operations. This function
400 * returns the LEB category to which the LEB properties belong. Note however
401 * that if the LEB category is stored as a heap and the heap is full, the
402 * LEB properties may have their category changed to %LPROPS_UNCAT.
404 int ubifs_categorize_lprops(const struct ubifs_info *c,
405 const struct ubifs_lprops *lprops)
407 if (lprops->flags & LPROPS_TAKEN)
410 if (lprops->free == c->leb_size) {
411 ubifs_assert(!(lprops->flags & LPROPS_INDEX));
415 if (lprops->free + lprops->dirty == c->leb_size) {
416 if (lprops->flags & LPROPS_INDEX)
417 return LPROPS_FRDI_IDX;
419 return LPROPS_FREEABLE;
422 if (lprops->flags & LPROPS_INDEX) {
423 if (lprops->dirty + lprops->free >= c->min_idx_node_sz)
424 return LPROPS_DIRTY_IDX;
426 if (lprops->dirty >= c->dead_wm &&
427 lprops->dirty > lprops->free)
429 if (lprops->free > 0)
437 * change_category - change LEB properties category.
438 * @c: UBIFS file-system description object
439 * @lprops: LEB properties to re-categorize
441 * LEB properties are categorized to enable fast find operations. When the LEB
442 * properties change they must be re-categorized.
444 static void change_category(struct ubifs_info *c, struct ubifs_lprops *lprops)
446 int old_cat = lprops->flags & LPROPS_CAT_MASK;
447 int new_cat = ubifs_categorize_lprops(c, lprops);
449 if (old_cat == new_cat) {
450 struct ubifs_lpt_heap *heap = &c->lpt_heap[new_cat - 1];
452 /* lprops on a heap now must be moved up or down */
453 if (new_cat < 1 || new_cat > LPROPS_HEAP_CNT)
454 return; /* Not on a heap */
455 heap = &c->lpt_heap[new_cat - 1];
456 adjust_lpt_heap(c, heap, lprops, lprops->hpos, new_cat);
458 ubifs_remove_from_cat(c, lprops, old_cat);
459 ubifs_add_to_cat(c, lprops, new_cat);
464 * ubifs_calc_dark - calculate LEB dark space size.
465 * @c: the UBIFS file-system description object
466 * @spc: amount of free and dirty space in the LEB
468 * This function calculates and returns amount of dark space in an LEB which
469 * has @spc bytes of free and dirty space.
471 * UBIFS is trying to account the space which might not be usable, and this
472 * space is called "dark space". For example, if an LEB has only %512 free
473 * bytes, it is dark space, because it cannot fit a large data node.
475 int ubifs_calc_dark(const struct ubifs_info *c, int spc)
477 ubifs_assert(!(spc & 7));
479 if (spc < c->dark_wm)
483 * If we have slightly more space then the dark space watermark, we can
484 * anyway safely assume it we'll be able to write a node of the
485 * smallest size there.
487 if (spc - c->dark_wm < MIN_WRITE_SZ)
488 return spc - MIN_WRITE_SZ;
494 * is_lprops_dirty - determine if LEB properties are dirty.
495 * @c: the UBIFS file-system description object
496 * @lprops: LEB properties to test
498 static int is_lprops_dirty(struct ubifs_info *c, struct ubifs_lprops *lprops)
500 struct ubifs_pnode *pnode;
503 pos = (lprops->lnum - c->main_first) & (UBIFS_LPT_FANOUT - 1);
504 pnode = (struct ubifs_pnode *)container_of(lprops - pos,
507 return !test_bit(COW_CNODE, &pnode->flags) &&
508 test_bit(DIRTY_CNODE, &pnode->flags);
512 * ubifs_change_lp - change LEB properties.
513 * @c: the UBIFS file-system description object
514 * @lp: LEB properties to change
515 * @free: new free space amount
516 * @dirty: new dirty space amount
518 * @idx_gc_cnt: change to the count of @idx_gc list
520 * This function changes LEB properties (@free, @dirty or @flag). However, the
521 * property which has the %LPROPS_NC value is not changed. Returns a pointer to
522 * the updated LEB properties on success and a negative error code on failure.
524 * Note, the LEB properties may have had to be copied (due to COW) and
525 * consequently the pointer returned may not be the same as the pointer
528 const struct ubifs_lprops *ubifs_change_lp(struct ubifs_info *c,
529 const struct ubifs_lprops *lp,
530 int free, int dirty, int flags,
534 * This is the only function that is allowed to change lprops, so we
535 * discard the "const" qualifier.
537 struct ubifs_lprops *lprops = (struct ubifs_lprops *)lp;
539 dbg_lp("LEB %d, free %d, dirty %d, flags %d",
540 lprops->lnum, free, dirty, flags);
542 ubifs_assert(mutex_is_locked(&c->lp_mutex));
543 ubifs_assert(c->lst.empty_lebs >= 0 &&
544 c->lst.empty_lebs <= c->main_lebs);
545 ubifs_assert(c->freeable_cnt >= 0);
546 ubifs_assert(c->freeable_cnt <= c->main_lebs);
547 ubifs_assert(c->lst.taken_empty_lebs >= 0);
548 ubifs_assert(c->lst.taken_empty_lebs <= c->lst.empty_lebs);
549 ubifs_assert(!(c->lst.total_free & 7) && !(c->lst.total_dirty & 7));
550 ubifs_assert(!(c->lst.total_dead & 7) && !(c->lst.total_dark & 7));
551 ubifs_assert(!(c->lst.total_used & 7));
552 ubifs_assert(free == LPROPS_NC || free >= 0);
553 ubifs_assert(dirty == LPROPS_NC || dirty >= 0);
555 if (!is_lprops_dirty(c, lprops)) {
556 lprops = ubifs_lpt_lookup_dirty(c, lprops->lnum);
560 ubifs_assert(lprops == ubifs_lpt_lookup_dirty(c, lprops->lnum));
562 ubifs_assert(!(lprops->free & 7) && !(lprops->dirty & 7));
564 spin_lock(&c->space_lock);
565 if ((lprops->flags & LPROPS_TAKEN) && lprops->free == c->leb_size)
566 c->lst.taken_empty_lebs -= 1;
568 if (!(lprops->flags & LPROPS_INDEX)) {
571 old_spc = lprops->free + lprops->dirty;
572 if (old_spc < c->dead_wm)
573 c->lst.total_dead -= old_spc;
575 c->lst.total_dark -= ubifs_calc_dark(c, old_spc);
577 c->lst.total_used -= c->leb_size - old_spc;
580 if (free != LPROPS_NC) {
581 free = ALIGN(free, 8);
582 c->lst.total_free += free - lprops->free;
584 /* Increase or decrease empty LEBs counter if needed */
585 if (free == c->leb_size) {
586 if (lprops->free != c->leb_size)
587 c->lst.empty_lebs += 1;
588 } else if (lprops->free == c->leb_size)
589 c->lst.empty_lebs -= 1;
593 if (dirty != LPROPS_NC) {
594 dirty = ALIGN(dirty, 8);
595 c->lst.total_dirty += dirty - lprops->dirty;
596 lprops->dirty = dirty;
599 if (flags != LPROPS_NC) {
600 /* Take care about indexing LEBs counter if needed */
601 if ((lprops->flags & LPROPS_INDEX)) {
602 if (!(flags & LPROPS_INDEX))
603 c->lst.idx_lebs -= 1;
604 } else if (flags & LPROPS_INDEX)
605 c->lst.idx_lebs += 1;
606 lprops->flags = flags;
609 if (!(lprops->flags & LPROPS_INDEX)) {
612 new_spc = lprops->free + lprops->dirty;
613 if (new_spc < c->dead_wm)
614 c->lst.total_dead += new_spc;
616 c->lst.total_dark += ubifs_calc_dark(c, new_spc);
618 c->lst.total_used += c->leb_size - new_spc;
621 if ((lprops->flags & LPROPS_TAKEN) && lprops->free == c->leb_size)
622 c->lst.taken_empty_lebs += 1;
624 change_category(c, lprops);
625 c->idx_gc_cnt += idx_gc_cnt;
626 spin_unlock(&c->space_lock);
631 * ubifs_get_lp_stats - get lprops statistics.
632 * @c: UBIFS file-system description object
633 * @st: return statistics
635 void ubifs_get_lp_stats(struct ubifs_info *c, struct ubifs_lp_stats *lst)
637 spin_lock(&c->space_lock);
638 memcpy(lst, &c->lst, sizeof(struct ubifs_lp_stats));
639 spin_unlock(&c->space_lock);
643 * ubifs_change_one_lp - change LEB properties.
644 * @c: the UBIFS file-system description object
645 * @lnum: LEB to change properties for
646 * @free: amount of free space
647 * @dirty: amount of dirty space
648 * @flags_set: flags to set
649 * @flags_clean: flags to clean
650 * @idx_gc_cnt: change to the count of idx_gc list
652 * This function changes properties of LEB @lnum. It is a helper wrapper over
653 * 'ubifs_change_lp()' which hides lprops get/release. The arguments are the
654 * same as in case of 'ubifs_change_lp()'. Returns zero in case of success and
655 * a negative error code in case of failure.
657 int ubifs_change_one_lp(struct ubifs_info *c, int lnum, int free, int dirty,
658 int flags_set, int flags_clean, int idx_gc_cnt)
661 const struct ubifs_lprops *lp;
665 lp = ubifs_lpt_lookup_dirty(c, lnum);
671 flags = (lp->flags | flags_set) & ~flags_clean;
672 lp = ubifs_change_lp(c, lp, free, dirty, flags, idx_gc_cnt);
677 ubifs_release_lprops(c);
679 ubifs_err("cannot change properties of LEB %d, error %d",
685 * ubifs_update_one_lp - update LEB properties.
686 * @c: the UBIFS file-system description object
687 * @lnum: LEB to change properties for
688 * @free: amount of free space
689 * @dirty: amount of dirty space to add
690 * @flags_set: flags to set
691 * @flags_clean: flags to clean
693 * This function is the same as 'ubifs_change_one_lp()' but @dirty is added to
694 * current dirty space, not substitutes it.
696 int ubifs_update_one_lp(struct ubifs_info *c, int lnum, int free, int dirty,
697 int flags_set, int flags_clean)
700 const struct ubifs_lprops *lp;
704 lp = ubifs_lpt_lookup_dirty(c, lnum);
710 flags = (lp->flags | flags_set) & ~flags_clean;
711 lp = ubifs_change_lp(c, lp, free, lp->dirty + dirty, flags, 0);
716 ubifs_release_lprops(c);
718 ubifs_err("cannot update properties of LEB %d, error %d",
724 * ubifs_read_one_lp - read LEB properties.
725 * @c: the UBIFS file-system description object
726 * @lnum: LEB to read properties for
727 * @lp: where to store read properties
729 * This helper function reads properties of a LEB @lnum and stores them in @lp.
730 * Returns zero in case of success and a negative error code in case of
733 int ubifs_read_one_lp(struct ubifs_info *c, int lnum, struct ubifs_lprops *lp)
736 const struct ubifs_lprops *lpp;
740 lpp = ubifs_lpt_lookup(c, lnum);
743 ubifs_err("cannot read properties of LEB %d, error %d",
748 memcpy(lp, lpp, sizeof(struct ubifs_lprops));
751 ubifs_release_lprops(c);
756 * ubifs_fast_find_free - try to find a LEB with free space quickly.
757 * @c: the UBIFS file-system description object
759 * This function returns LEB properties for a LEB with free space or %NULL if
760 * the function is unable to find a LEB quickly.
762 const struct ubifs_lprops *ubifs_fast_find_free(struct ubifs_info *c)
764 struct ubifs_lprops *lprops;
765 struct ubifs_lpt_heap *heap;
767 ubifs_assert(mutex_is_locked(&c->lp_mutex));
769 heap = &c->lpt_heap[LPROPS_FREE - 1];
773 lprops = heap->arr[0];
774 ubifs_assert(!(lprops->flags & LPROPS_TAKEN));
775 ubifs_assert(!(lprops->flags & LPROPS_INDEX));
780 * ubifs_fast_find_empty - try to find an empty LEB quickly.
781 * @c: the UBIFS file-system description object
783 * This function returns LEB properties for an empty LEB or %NULL if the
784 * function is unable to find an empty LEB quickly.
786 const struct ubifs_lprops *ubifs_fast_find_empty(struct ubifs_info *c)
788 struct ubifs_lprops *lprops;
790 ubifs_assert(mutex_is_locked(&c->lp_mutex));
792 if (list_empty(&c->empty_list))
795 lprops = list_entry(c->empty_list.next, struct ubifs_lprops, list);
796 ubifs_assert(!(lprops->flags & LPROPS_TAKEN));
797 ubifs_assert(!(lprops->flags & LPROPS_INDEX));
798 ubifs_assert(lprops->free == c->leb_size);
803 * ubifs_fast_find_freeable - try to find a freeable LEB quickly.
804 * @c: the UBIFS file-system description object
806 * This function returns LEB properties for a freeable LEB or %NULL if the
807 * function is unable to find a freeable LEB quickly.
809 const struct ubifs_lprops *ubifs_fast_find_freeable(struct ubifs_info *c)
811 struct ubifs_lprops *lprops;
813 ubifs_assert(mutex_is_locked(&c->lp_mutex));
815 if (list_empty(&c->freeable_list))
818 lprops = list_entry(c->freeable_list.next, struct ubifs_lprops, list);
819 ubifs_assert(!(lprops->flags & LPROPS_TAKEN));
820 ubifs_assert(!(lprops->flags & LPROPS_INDEX));
821 ubifs_assert(lprops->free + lprops->dirty == c->leb_size);
822 ubifs_assert(c->freeable_cnt > 0);
827 * ubifs_fast_find_frdi_idx - try to find a freeable index LEB quickly.
828 * @c: the UBIFS file-system description object
830 * This function returns LEB properties for a freeable index LEB or %NULL if the
831 * function is unable to find a freeable index LEB quickly.
833 const struct ubifs_lprops *ubifs_fast_find_frdi_idx(struct ubifs_info *c)
835 struct ubifs_lprops *lprops;
837 ubifs_assert(mutex_is_locked(&c->lp_mutex));
839 if (list_empty(&c->frdi_idx_list))
842 lprops = list_entry(c->frdi_idx_list.next, struct ubifs_lprops, list);
843 ubifs_assert(!(lprops->flags & LPROPS_TAKEN));
844 ubifs_assert((lprops->flags & LPROPS_INDEX));
845 ubifs_assert(lprops->free + lprops->dirty == c->leb_size);
849 #ifdef CONFIG_UBIFS_FS_DEBUG
852 * dbg_check_cats - check category heaps and lists.
853 * @c: UBIFS file-system description object
855 * This function returns %0 on success and a negative error code on failure.
857 int dbg_check_cats(struct ubifs_info *c)
859 struct ubifs_lprops *lprops;
860 struct list_head *pos;
863 if (!dbg_is_chk_gen(c) && !dbg_is_chk_lprops(c))
866 list_for_each_entry(lprops, &c->empty_list, list) {
867 if (lprops->free != c->leb_size) {
868 ubifs_err("non-empty LEB %d on empty list "
869 "(free %d dirty %d flags %d)", lprops->lnum,
870 lprops->free, lprops->dirty, lprops->flags);
873 if (lprops->flags & LPROPS_TAKEN) {
874 ubifs_err("taken LEB %d on empty list "
875 "(free %d dirty %d flags %d)", lprops->lnum,
876 lprops->free, lprops->dirty, lprops->flags);
882 list_for_each_entry(lprops, &c->freeable_list, list) {
883 if (lprops->free + lprops->dirty != c->leb_size) {
884 ubifs_err("non-freeable LEB %d on freeable list "
885 "(free %d dirty %d flags %d)", lprops->lnum,
886 lprops->free, lprops->dirty, lprops->flags);
889 if (lprops->flags & LPROPS_TAKEN) {
890 ubifs_err("taken LEB %d on freeable list "
891 "(free %d dirty %d flags %d)", lprops->lnum,
892 lprops->free, lprops->dirty, lprops->flags);
897 if (i != c->freeable_cnt) {
898 ubifs_err("freeable list count %d expected %d", i,
904 list_for_each(pos, &c->idx_gc)
906 if (i != c->idx_gc_cnt) {
907 ubifs_err("idx_gc list count %d expected %d", i,
912 list_for_each_entry(lprops, &c->frdi_idx_list, list) {
913 if (lprops->free + lprops->dirty != c->leb_size) {
914 ubifs_err("non-freeable LEB %d on frdi_idx list "
915 "(free %d dirty %d flags %d)", lprops->lnum,
916 lprops->free, lprops->dirty, lprops->flags);
919 if (lprops->flags & LPROPS_TAKEN) {
920 ubifs_err("taken LEB %d on frdi_idx list "
921 "(free %d dirty %d flags %d)", lprops->lnum,
922 lprops->free, lprops->dirty, lprops->flags);
925 if (!(lprops->flags & LPROPS_INDEX)) {
926 ubifs_err("non-index LEB %d on frdi_idx list "
927 "(free %d dirty %d flags %d)", lprops->lnum,
928 lprops->free, lprops->dirty, lprops->flags);
933 for (cat = 1; cat <= LPROPS_HEAP_CNT; cat++) {
934 struct ubifs_lpt_heap *heap = &c->lpt_heap[cat - 1];
936 for (i = 0; i < heap->cnt; i++) {
937 lprops = heap->arr[i];
939 ubifs_err("null ptr in LPT heap cat %d", cat);
942 if (lprops->hpos != i) {
943 ubifs_err("bad ptr in LPT heap cat %d", cat);
946 if (lprops->flags & LPROPS_TAKEN) {
947 ubifs_err("taken LEB in LPT heap cat %d", cat);
956 void dbg_check_heap(struct ubifs_info *c, struct ubifs_lpt_heap *heap, int cat,
959 int i = 0, j, err = 0;
961 if (!dbg_is_chk_gen(c) && !dbg_is_chk_lprops(c))
964 for (i = 0; i < heap->cnt; i++) {
965 struct ubifs_lprops *lprops = heap->arr[i];
966 struct ubifs_lprops *lp;
969 if ((lprops->flags & LPROPS_CAT_MASK) != cat) {
973 if (lprops->hpos != i) {
977 lp = ubifs_lpt_lookup(c, lprops->lnum);
983 dbg_msg("lprops %zx lp %zx lprops->lnum %d lp->lnum %d",
984 (size_t)lprops, (size_t)lp, lprops->lnum,
989 for (j = 0; j < i; j++) {
995 if (lp->lnum == lprops->lnum) {
1003 dbg_msg("failed cat %d hpos %d err %d", cat, i, err);
1005 dbg_dump_heap(c, heap, cat);
1010 * scan_check_cb - scan callback.
1011 * @c: the UBIFS file-system description object
1012 * @lp: LEB properties to scan
1013 * @in_tree: whether the LEB properties are in main memory
1014 * @lst: lprops statistics to update
1016 * This function returns a code that indicates whether the scan should continue
1017 * (%LPT_SCAN_CONTINUE), whether the LEB properties should be added to the tree
1018 * in main memory (%LPT_SCAN_ADD), or whether the scan should stop
1021 static int scan_check_cb(struct ubifs_info *c,
1022 const struct ubifs_lprops *lp, int in_tree,
1023 struct ubifs_lp_stats *lst)
1025 struct ubifs_scan_leb *sleb;
1026 struct ubifs_scan_node *snod;
1027 int cat, lnum = lp->lnum, is_idx = 0, used = 0, free, dirty, ret;
1030 cat = lp->flags & LPROPS_CAT_MASK;
1031 if (cat != LPROPS_UNCAT) {
1032 cat = ubifs_categorize_lprops(c, lp);
1033 if (cat != (lp->flags & LPROPS_CAT_MASK)) {
1034 ubifs_err("bad LEB category %d expected %d",
1035 (lp->flags & LPROPS_CAT_MASK), cat);
1040 /* Check lp is on its category list (if it has one) */
1042 struct list_head *list = NULL;
1046 list = &c->empty_list;
1048 case LPROPS_FREEABLE:
1049 list = &c->freeable_list;
1051 case LPROPS_FRDI_IDX:
1052 list = &c->frdi_idx_list;
1055 list = &c->uncat_list;
1059 struct ubifs_lprops *lprops;
1062 list_for_each_entry(lprops, list, list) {
1069 ubifs_err("bad LPT list (category %d)", cat);
1075 /* Check lp is on its category heap (if it has one) */
1076 if (in_tree && cat > 0 && cat <= LPROPS_HEAP_CNT) {
1077 struct ubifs_lpt_heap *heap = &c->lpt_heap[cat - 1];
1079 if ((lp->hpos != -1 && heap->arr[lp->hpos]->lnum != lnum) ||
1080 lp != heap->arr[lp->hpos]) {
1081 ubifs_err("bad LPT heap (category %d)", cat);
1086 buf = __vmalloc(c->leb_size, GFP_NOFS, PAGE_KERNEL);
1091 * After an unclean unmount, empty and freeable LEBs
1092 * may contain garbage - do not scan them.
1094 if (lp->free == c->leb_size) {
1095 lst->empty_lebs += 1;
1096 lst->total_free += c->leb_size;
1097 lst->total_dark += ubifs_calc_dark(c, c->leb_size);
1098 return LPT_SCAN_CONTINUE;
1100 if (lp->free + lp->dirty == c->leb_size &&
1101 !(lp->flags & LPROPS_INDEX)) {
1102 lst->total_free += lp->free;
1103 lst->total_dirty += lp->dirty;
1104 lst->total_dark += ubifs_calc_dark(c, c->leb_size);
1105 return LPT_SCAN_CONTINUE;
1108 sleb = ubifs_scan(c, lnum, 0, buf, 0);
1110 ret = PTR_ERR(sleb);
1111 if (ret == -EUCLEAN) {
1113 dbg_dump_budg(c, &c->bi);
1119 list_for_each_entry(snod, &sleb->nodes, list) {
1120 int found, level = 0;
1125 is_idx = (snod->type == UBIFS_IDX_NODE) ? 1 : 0;
1127 if (is_idx && snod->type != UBIFS_IDX_NODE) {
1128 ubifs_err("indexing node in data LEB %d:%d",
1133 if (snod->type == UBIFS_IDX_NODE) {
1134 struct ubifs_idx_node *idx = snod->node;
1136 key_read(c, ubifs_idx_key(c, idx), &snod->key);
1137 level = le16_to_cpu(idx->level);
1140 found = ubifs_tnc_has_node(c, &snod->key, level, lnum,
1141 snod->offs, is_idx);
1145 used += ALIGN(snod->len, 8);
1149 free = c->leb_size - sleb->endpt;
1150 dirty = sleb->endpt - used;
1152 if (free > c->leb_size || free < 0 || dirty > c->leb_size ||
1154 ubifs_err("bad calculated accounting for LEB %d: "
1155 "free %d, dirty %d", lnum, free, dirty);
1159 if (lp->free + lp->dirty == c->leb_size &&
1160 free + dirty == c->leb_size)
1161 if ((is_idx && !(lp->flags & LPROPS_INDEX)) ||
1162 (!is_idx && free == c->leb_size) ||
1163 lp->free == c->leb_size) {
1165 * Empty or freeable LEBs could contain index
1166 * nodes from an uncompleted commit due to an
1167 * unclean unmount. Or they could be empty for
1168 * the same reason. Or it may simply not have been
1176 if (is_idx && lp->free + lp->dirty == free + dirty &&
1177 lnum != c->ihead_lnum) {
1179 * After an unclean unmount, an index LEB could have a different
1180 * amount of free space than the value recorded by lprops. That
1181 * is because the in-the-gaps method may use free space or
1182 * create free space (as a side-effect of using ubi_leb_change
1183 * and not writing the whole LEB). The incorrect free space
1184 * value is not a problem because the index is only ever
1185 * allocated empty LEBs, so there will never be an attempt to
1186 * write to the free space at the end of an index LEB - except
1187 * by the in-the-gaps method for which it is not a problem.
1193 if (lp->free != free || lp->dirty != dirty)
1196 if (is_idx && !(lp->flags & LPROPS_INDEX)) {
1197 if (free == c->leb_size)
1198 /* Free but not unmapped LEB, it's fine */
1201 ubifs_err("indexing node without indexing "
1207 if (!is_idx && (lp->flags & LPROPS_INDEX)) {
1208 ubifs_err("data node with indexing flag");
1212 if (free == c->leb_size)
1213 lst->empty_lebs += 1;
1218 if (!(lp->flags & LPROPS_INDEX))
1219 lst->total_used += c->leb_size - free - dirty;
1220 lst->total_free += free;
1221 lst->total_dirty += dirty;
1223 if (!(lp->flags & LPROPS_INDEX)) {
1224 int spc = free + dirty;
1226 if (spc < c->dead_wm)
1227 lst->total_dead += spc;
1229 lst->total_dark += ubifs_calc_dark(c, spc);
1232 ubifs_scan_destroy(sleb);
1234 return LPT_SCAN_CONTINUE;
1237 ubifs_err("bad accounting of LEB %d: free %d, dirty %d flags %#x, "
1238 "should be free %d, dirty %d",
1239 lnum, lp->free, lp->dirty, lp->flags, free, dirty);
1240 dbg_dump_leb(c, lnum);
1242 ubifs_scan_destroy(sleb);
1250 * dbg_check_lprops - check all LEB properties.
1251 * @c: UBIFS file-system description object
1253 * This function checks all LEB properties and makes sure they are all correct.
1254 * It returns zero if everything is fine, %-EINVAL if there is an inconsistency
1255 * and other negative error codes in case of other errors. This function is
1256 * called while the file system is locked (because of commit start), so no
1257 * additional locking is required. Note that locking the LPT mutex would cause
1258 * a circular lock dependency with the TNC mutex.
1260 int dbg_check_lprops(struct ubifs_info *c)
1263 struct ubifs_lp_stats lst;
1265 if (!dbg_is_chk_lprops(c))
1269 * As we are going to scan the media, the write buffers have to be
1272 for (i = 0; i < c->jhead_cnt; i++) {
1273 err = ubifs_wbuf_sync(&c->jheads[i].wbuf);
1278 memset(&lst, 0, sizeof(struct ubifs_lp_stats));
1279 err = ubifs_lpt_scan_nolock(c, c->main_first, c->leb_cnt - 1,
1280 (ubifs_lpt_scan_callback)scan_check_cb,
1282 if (err && err != -ENOSPC)
1285 if (lst.empty_lebs != c->lst.empty_lebs ||
1286 lst.idx_lebs != c->lst.idx_lebs ||
1287 lst.total_free != c->lst.total_free ||
1288 lst.total_dirty != c->lst.total_dirty ||
1289 lst.total_used != c->lst.total_used) {
1290 ubifs_err("bad overall accounting");
1291 ubifs_err("calculated: empty_lebs %d, idx_lebs %d, "
1292 "total_free %lld, total_dirty %lld, total_used %lld",
1293 lst.empty_lebs, lst.idx_lebs, lst.total_free,
1294 lst.total_dirty, lst.total_used);
1295 ubifs_err("read from lprops: empty_lebs %d, idx_lebs %d, "
1296 "total_free %lld, total_dirty %lld, total_used %lld",
1297 c->lst.empty_lebs, c->lst.idx_lebs, c->lst.total_free,
1298 c->lst.total_dirty, c->lst.total_used);
1303 if (lst.total_dead != c->lst.total_dead ||
1304 lst.total_dark != c->lst.total_dark) {
1305 ubifs_err("bad dead/dark space accounting");
1306 ubifs_err("calculated: total_dead %lld, total_dark %lld",
1307 lst.total_dead, lst.total_dark);
1308 ubifs_err("read from lprops: total_dead %lld, total_dark %lld",
1309 c->lst.total_dead, c->lst.total_dark);
1314 err = dbg_check_cats(c);
1319 #endif /* CONFIG_UBIFS_FS_DEBUG */