1 // SPDX-License-Identifier: GPL-2.0
3 #include "btree_update.h"
4 #include "btree_update_interior.h"
8 #include "extent_update.h"
11 * This counts the number of iterators to the alloc & ec btrees we'll need
12 * inserting/removing this extent:
14 static unsigned bch2_bkey_nr_alloc_ptrs(struct bkey_s_c k)
16 struct bkey_ptrs_c ptrs = bch2_bkey_ptrs_c(k);
17 const union bch_extent_entry *entry;
20 bkey_extent_entry_for_each(ptrs, entry) {
21 switch (__extent_entry_type(entry)) {
22 case BCH_EXTENT_ENTRY_ptr:
23 case BCH_EXTENT_ENTRY_stripe_ptr:
31 static int count_iters_for_insert(struct btree_trans *trans,
38 int ret = 0, ret2 = 0;
40 if (*nr_iters >= max_iters) {
41 *end = bpos_min(*end, k.k->p);
47 case KEY_TYPE_reflink_v:
48 *nr_iters += bch2_bkey_nr_alloc_ptrs(k);
50 if (*nr_iters >= max_iters) {
51 *end = bpos_min(*end, k.k->p);
56 case KEY_TYPE_reflink_p: {
57 struct bkey_s_c_reflink_p p = bkey_s_c_to_reflink_p(k);
58 u64 idx = le64_to_cpu(p.v->idx);
59 unsigned sectors = bpos_min(*end, p.k->p).offset -
60 bkey_start_offset(p.k);
61 struct btree_iter *iter;
64 for_each_btree_key(trans, iter,
65 BTREE_ID_REFLINK, POS(0, idx + offset),
66 BTREE_ITER_SLOTS, r_k, ret2) {
67 if (bkey_cmp(bkey_start_pos(r_k.k),
68 POS(0, idx + sectors)) >= 0)
71 /* extent_update_to_keys(), for the reflink_v update */
74 *nr_iters += 1 + bch2_bkey_nr_alloc_ptrs(r_k);
76 if (*nr_iters >= max_iters) {
77 struct bpos pos = bkey_start_pos(k.k);
78 pos.offset += min_t(u64, k.k->size,
79 r_k.k->p.offset - idx);
81 *end = bpos_min(*end, pos);
87 bch2_trans_iter_put(trans, iter);
95 #define EXTENT_ITERS_MAX (BTREE_ITER_MAX / 3)
97 int bch2_extent_atomic_end(struct btree_iter *iter,
98 struct bkey_i *insert,
101 struct btree_trans *trans = iter->trans;
103 struct btree_node_iter node_iter;
104 struct bkey_packed *_k;
105 unsigned nr_iters = 0;
108 ret = bch2_btree_iter_traverse(iter);
113 node_iter = iter->l[0].iter;
115 BUG_ON(bkey_cmp(b->data->min_key, POS_MIN) &&
116 bkey_cmp(bkey_start_pos(&insert->k),
117 bkey_predecessor(b->data->min_key)) < 0);
119 *end = bpos_min(insert->k.p, b->key.k.p);
121 /* extent_update_to_keys(): */
124 ret = count_iters_for_insert(trans, bkey_i_to_s_c(insert), 0, end,
125 &nr_iters, EXTENT_ITERS_MAX / 2);
129 while ((_k = bch2_btree_node_iter_peek(&node_iter, b))) {
130 struct bkey unpacked;
131 struct bkey_s_c k = bkey_disassemble(b, _k, &unpacked);
134 if (bkey_cmp(bkey_start_pos(k.k), *end) >= 0)
137 if (bkey_cmp(bkey_start_pos(&insert->k),
138 bkey_start_pos(k.k)) > 0)
139 offset = bkey_start_offset(&insert->k) -
140 bkey_start_offset(k.k);
142 /* extent_handle_overwrites(): */
143 switch (bch2_extent_overlap(&insert->k, k.k)) {
144 case BCH_EXTENT_OVERLAP_ALL:
145 case BCH_EXTENT_OVERLAP_FRONT:
148 case BCH_EXTENT_OVERLAP_BACK:
149 case BCH_EXTENT_OVERLAP_MIDDLE:
154 ret = count_iters_for_insert(trans, k, offset, end,
155 &nr_iters, EXTENT_ITERS_MAX);
159 bch2_btree_node_iter_advance(&node_iter, b);
162 return ret < 0 ? ret : 0;
165 int bch2_extent_trim_atomic(struct bkey_i *k, struct btree_iter *iter)
170 ret = bch2_extent_atomic_end(iter, k, &end);
174 bch2_cut_back(end, k);
178 int bch2_extent_is_atomic(struct bkey_i *k, struct btree_iter *iter)
183 ret = bch2_extent_atomic_end(iter, k, &end);
187 return !bkey_cmp(end, k->k.p);
190 enum btree_insert_ret
191 bch2_extent_can_insert(struct btree_trans *trans,
192 struct btree_iter *iter,
193 struct bkey_i *insert)
195 struct btree_iter_level *l = &iter->l[0];
196 struct btree_node_iter node_iter = l->iter;
197 struct bkey_packed *_k;
199 struct bkey unpacked;
202 _k = bch2_btree_node_iter_peek(&node_iter, l->b);
204 return BTREE_INSERT_OK;
206 k = bkey_disassemble(l->b, _k, &unpacked);
208 /* Check if we're splitting a compressed extent: */
210 if (bkey_cmp(bkey_start_pos(&insert->k), bkey_start_pos(k.k)) > 0 &&
211 bkey_cmp(insert->k.p, k.k->p) < 0 &&
212 (sectors = bch2_bkey_sectors_compressed(k))) {
213 int flags = trans->flags & BTREE_INSERT_NOFAIL
214 ? BCH_DISK_RESERVATION_NOFAIL : 0;
216 switch (bch2_disk_reservation_add(trans->c, trans->disk_res,
221 return BTREE_INSERT_ENOSPC;
227 return BTREE_INSERT_OK;