-/*
- * If keys compare equal, compare by pointer order:
- *
- * Necessary for sort_fix_overlapping() - if there are multiple keys that
- * compare equal in different sets, we have to process them newest to oldest.
- */
-static inline int extent_sort_fix_overlapping_cmp(struct btree *b,
- struct bkey_packed *l,
- struct bkey_packed *r)
-{
- struct bkey ul = bkey_unpack_key(b, l);
- struct bkey ur = bkey_unpack_key(b, r);
-
- return bkey_cmp(bkey_start_pos(&ul),
- bkey_start_pos(&ur)) ?:
- cmp_int((unsigned long) r, (unsigned long) l);
-}
-
-static void extent_sort_advance_prev(struct bkey_format *f,
- struct btree_nr_keys *nr,
- struct bkey_packed *start,
- struct bkey_packed **prev)
-{
- if (*prev) {
- bch2_bkey_pack(*prev, (void *) *prev, f);
-
- btree_keys_account_key_add(nr, 0, *prev);
- *prev = bkey_next(*prev);
- } else {
- *prev = start;
- }
-}
-
-static void extent_sort_append(struct bch_fs *c,
- struct bkey_format *f,
- struct btree_nr_keys *nr,
- struct bkey_packed *start,
- struct bkey_packed **prev,
- struct bkey_s k)
-{
- if (bkey_whiteout(k.k))
- return;
-
- /*
- * prev is always unpacked, for key merging - until right before we
- * advance it:
- */
-
- if (*prev &&
- bch2_bkey_merge(c, bkey_i_to_s((void *) *prev), k) ==
- BCH_MERGE_MERGE)
- return;
-
- extent_sort_advance_prev(f, nr, start, prev);
-
- bkey_reassemble((void *) *prev, k.s_c);
-}
-
-struct btree_nr_keys
-bch2_extent_sort_fix_overlapping(struct bch_fs *c, struct bset *dst,
- struct sort_iter *iter)
-{
- struct btree *b = iter->b;
- struct bkey_format *f = &b->format;
- struct sort_iter_set *_l = iter->data, *_r = iter->data + 1;
- struct bkey_packed *prev = NULL;
- struct bkey l_unpacked, r_unpacked;
- struct bkey_s l, r;
- struct btree_nr_keys nr;
- struct bkey_on_stack split;
-
- memset(&nr, 0, sizeof(nr));
- bkey_on_stack_init(&split);
-
- sort_iter_sort(iter, extent_sort_fix_overlapping_cmp);
-
- while (!sort_iter_end(iter)) {
- l = __bkey_disassemble(b, _l->k, &l_unpacked);
-
- if (iter->used == 1) {
- extent_sort_append(c, f, &nr, dst->start, &prev, l);
- sort_iter_advance(iter,
- extent_sort_fix_overlapping_cmp);
- continue;
- }
-
- r = __bkey_disassemble(b, _r->k, &r_unpacked);
-
- /* If current key and next key don't overlap, just append */
- if (bkey_cmp(l.k->p, bkey_start_pos(r.k)) <= 0) {
- extent_sort_append(c, f, &nr, dst->start, &prev, l);
- sort_iter_advance(iter,
- extent_sort_fix_overlapping_cmp);
- continue;
- }
-
- /* Skip 0 size keys */
- if (!r.k->size) {
- __sort_iter_advance(iter, 1,
- extent_sort_fix_overlapping_cmp);
- continue;
- }
-
- /*
- * overlap: keep the newer key and trim the older key so they
- * don't overlap. comparing pointers tells us which one is
- * newer, since the bsets are appended one after the other.
- */
-
- /* can't happen because of comparison func */
- BUG_ON(_l->k < _r->k &&
- !bkey_cmp(bkey_start_pos(l.k), bkey_start_pos(r.k)));
-
- if (_l->k > _r->k) {
- /* l wins, trim r */
- if (bkey_cmp(l.k->p, r.k->p) >= 0) {
- __sort_iter_advance(iter, 1,
- extent_sort_fix_overlapping_cmp);
- } else {
- bch2_cut_front_s(l.k->p, r);
- extent_save(b, _r->k, r.k);
- __sort_iter_sift(iter, 1,
- extent_sort_fix_overlapping_cmp);
- }
- } else if (bkey_cmp(l.k->p, r.k->p) > 0) {
-
- /*
- * r wins, but it overlaps in the middle of l - split l:
- */
- bkey_on_stack_reassemble(&split, c, l.s_c);
- bch2_cut_back(bkey_start_pos(r.k), split.k);
-
- bch2_cut_front_s(r.k->p, l);
- extent_save(b, _l->k, l.k);
-
- __sort_iter_sift(iter, 0,
- extent_sort_fix_overlapping_cmp);
-
- extent_sort_append(c, f, &nr, dst->start,
- &prev, bkey_i_to_s(split.k));
- } else {
- bch2_cut_back_s(bkey_start_pos(r.k), l);
- extent_save(b, _l->k, l.k);
- }
- }
-
- extent_sort_advance_prev(f, &nr, dst->start, &prev);
-
- dst->u64s = cpu_to_le16((u64 *) prev - dst->_data);
-
- bkey_on_stack_exit(&split, c);
- return nr;
-}
-