1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _BCACHEFS_BTREE_ITER_H
3 #define _BCACHEFS_BTREE_ITER_H
6 #include "btree_types.h"
8 static inline void btree_iter_set_dirty(struct btree_iter *iter,
9 enum btree_iter_uptodate u)
11 iter->uptodate = max_t(unsigned, iter->uptodate, u);
14 static inline struct btree *btree_iter_node(struct btree_iter *iter,
17 return level < BTREE_MAX_DEPTH ? iter->l[level].b : NULL;
20 static inline bool btree_node_lock_seq_matches(const struct btree_iter *iter,
21 const struct btree *b, unsigned level)
24 * We don't compare the low bits of the lock sequence numbers because
25 * @iter might have taken a write lock on @b, and we don't want to skip
26 * the linked iterator if the sequence numbers were equal before taking
27 * that write lock. The lock sequence number is incremented by taking
28 * and releasing write locks and is even when unlocked:
30 return iter->l[level].lock_seq >> 1 == b->lock.state.seq >> 1;
33 static inline struct btree *btree_node_parent(struct btree_iter *iter,
36 return btree_iter_node(iter, b->level + 1);
39 static inline bool btree_trans_has_multiple_iters(const struct btree_trans *trans)
41 return hweight64(trans->iters_linked) > 1;
44 static inline int btree_iter_err(const struct btree_iter *iter)
46 return iter->flags & BTREE_ITER_ERROR ? -EIO : 0;
49 /* Iterate over iters within a transaction: */
51 #define trans_for_each_iter_all(_trans, _iter) \
52 for (_iter = (_trans)->iters; \
53 _iter < (_trans)->iters + (_trans)->nr_iters; \
56 static inline struct btree_iter *
57 __trans_next_iter(struct btree_trans *trans, unsigned idx)
59 EBUG_ON(idx < trans->nr_iters && trans->iters[idx].idx != idx);
61 for (; idx < trans->nr_iters; idx++)
62 if (trans->iters_linked & (1ULL << idx))
63 return &trans->iters[idx];
68 #define trans_for_each_iter(_trans, _iter) \
69 for (_iter = __trans_next_iter((_trans), 0); \
71 _iter = __trans_next_iter((_trans), (_iter)->idx + 1))
73 static inline bool __iter_has_node(const struct btree_iter *iter,
74 const struct btree *b)
76 return iter->l[b->level].b == b &&
77 btree_node_lock_seq_matches(iter, b, b->level);
80 static inline struct btree_iter *
81 __trans_next_iter_with_node(struct btree_trans *trans, struct btree *b,
84 struct btree_iter *iter = __trans_next_iter(trans, idx);
86 while (iter && !__iter_has_node(iter, b))
87 iter = __trans_next_iter(trans, iter->idx + 1);
92 #define trans_for_each_iter_with_node(_trans, _b, _iter) \
93 for (_iter = __trans_next_iter_with_node((_trans), (_b), 0); \
95 _iter = __trans_next_iter_with_node((_trans), (_b), \
98 #ifdef CONFIG_BCACHEFS_DEBUG
99 void bch2_btree_trans_verify_iters(struct btree_trans *, struct btree *);
100 void bch2_btree_trans_verify_locks(struct btree_trans *);
102 static inline void bch2_btree_trans_verify_iters(struct btree_trans *trans,
104 static inline void bch2_btree_trans_verify_locks(struct btree_trans *iter) {}
107 void bch2_btree_iter_fix_key_modified(struct btree_iter *, struct btree *,
108 struct bkey_packed *);
109 void bch2_btree_node_iter_fix(struct btree_iter *, struct btree *,
110 struct btree_node_iter *, struct bkey_packed *,
113 bool bch2_trans_relock(struct btree_trans *);
114 void bch2_trans_unlock(struct btree_trans *);
116 bool __bch2_btree_iter_upgrade(struct btree_iter *, unsigned);
117 bool __bch2_btree_iter_upgrade_nounlock(struct btree_iter *, unsigned);
119 static inline bool bch2_btree_iter_upgrade(struct btree_iter *iter,
120 unsigned new_locks_want)
122 new_locks_want = min(new_locks_want, BTREE_MAX_DEPTH);
124 return iter->locks_want < new_locks_want
125 ? (!iter->trans->nounlock
126 ? __bch2_btree_iter_upgrade(iter, new_locks_want)
127 : __bch2_btree_iter_upgrade_nounlock(iter, new_locks_want))
128 : iter->uptodate <= BTREE_ITER_NEED_PEEK;
131 void __bch2_btree_iter_downgrade(struct btree_iter *, unsigned);
133 static inline void bch2_btree_iter_downgrade(struct btree_iter *iter)
135 if (iter->locks_want > (iter->flags & BTREE_ITER_INTENT) ? 1 : 0)
136 __bch2_btree_iter_downgrade(iter, 0);
139 void bch2_btree_iter_node_replace(struct btree_iter *, struct btree *);
140 void bch2_btree_iter_node_drop(struct btree_iter *, struct btree *);
142 void bch2_btree_iter_reinit_node(struct btree_iter *, struct btree *);
144 int __must_check __bch2_btree_iter_traverse(struct btree_iter *);
146 static inline int __must_check
147 bch2_btree_iter_traverse(struct btree_iter *iter)
149 return iter->uptodate >= BTREE_ITER_NEED_RELOCK
150 ? __bch2_btree_iter_traverse(iter)
154 int bch2_btree_iter_traverse_all(struct btree_trans *);
156 struct btree *bch2_btree_iter_peek_node(struct btree_iter *);
157 struct btree *bch2_btree_iter_next_node(struct btree_iter *);
159 struct bkey_s_c bch2_btree_iter_peek(struct btree_iter *);
160 struct bkey_s_c bch2_btree_iter_next(struct btree_iter *);
162 struct bkey_s_c bch2_btree_iter_peek_with_updates(struct btree_iter *);
163 struct bkey_s_c bch2_btree_iter_next_with_updates(struct btree_iter *);
165 struct bkey_s_c bch2_btree_iter_peek_prev(struct btree_iter *);
166 struct bkey_s_c bch2_btree_iter_prev(struct btree_iter *);
168 struct bkey_s_c bch2_btree_iter_peek_slot(struct btree_iter *);
169 struct bkey_s_c bch2_btree_iter_next_slot(struct btree_iter *);
171 void bch2_btree_iter_set_pos_same_leaf(struct btree_iter *, struct bpos);
172 void __bch2_btree_iter_set_pos(struct btree_iter *, struct bpos, bool);
173 void bch2_btree_iter_set_pos(struct btree_iter *, struct bpos);
175 static inline int __btree_iter_cmp(enum btree_id id,
177 const struct btree_iter *r)
179 return cmp_int(id, r->btree_id) ?: bkey_cmp(pos, r->pos);
182 static inline int btree_iter_cmp(const struct btree_iter *l,
183 const struct btree_iter *r)
185 return __btree_iter_cmp(l->btree_id, l->pos, r);
189 * Unlocks before scheduling
190 * Note: does not revalidate iterator
192 static inline int bch2_trans_cond_resched(struct btree_trans *trans)
194 if (need_resched() || race_fault()) {
195 bch2_trans_unlock(trans);
197 return bch2_trans_relock(trans) ? 0 : -EINTR;
203 #define __for_each_btree_node(_trans, _iter, _btree_id, _start, \
204 _locks_want, _depth, _flags, _b) \
205 for (iter = bch2_trans_get_node_iter((_trans), (_btree_id), \
206 _start, _locks_want, _depth, _flags), \
207 _b = bch2_btree_iter_peek_node(_iter); \
209 (_b) = bch2_btree_iter_next_node(_iter))
211 #define for_each_btree_node(_trans, _iter, _btree_id, _start, \
213 __for_each_btree_node(_trans, _iter, _btree_id, _start, \
216 static inline struct bkey_s_c __bch2_btree_iter_peek(struct btree_iter *iter,
219 return flags & BTREE_ITER_SLOTS
220 ? bch2_btree_iter_peek_slot(iter)
221 : bch2_btree_iter_peek(iter);
224 static inline struct bkey_s_c __bch2_btree_iter_next(struct btree_iter *iter,
227 return flags & BTREE_ITER_SLOTS
228 ? bch2_btree_iter_next_slot(iter)
229 : bch2_btree_iter_next(iter);
232 static inline int bkey_err(struct bkey_s_c k)
234 return PTR_ERR_OR_ZERO(k.k);
237 #define for_each_btree_key(_trans, _iter, _btree_id, \
238 _start, _flags, _k, _ret) \
239 for ((_ret) = PTR_ERR_OR_ZERO((_iter) = \
240 bch2_trans_get_iter((_trans), (_btree_id), \
241 (_start), (_flags))) ?: \
242 PTR_ERR_OR_ZERO(((_k) = \
243 __bch2_btree_iter_peek(_iter, _flags)).k); \
245 (_ret) = PTR_ERR_OR_ZERO(((_k) = \
246 __bch2_btree_iter_next(_iter, _flags)).k))
248 #define for_each_btree_key_continue(_iter, _flags, _k, _ret) \
249 for ((_k) = __bch2_btree_iter_peek(_iter, _flags); \
250 !((_ret) = bkey_err(_k)) && (_k).k; \
251 (_k) = __bch2_btree_iter_next(_iter, _flags))
253 /* new multiple iterator interface: */
255 int bch2_trans_iter_put(struct btree_trans *, struct btree_iter *);
256 int bch2_trans_iter_free(struct btree_trans *, struct btree_iter *);
258 void bch2_trans_unlink_iters(struct btree_trans *);
260 struct btree_iter *bch2_trans_get_iter(struct btree_trans *, enum btree_id,
261 struct bpos, unsigned);
262 struct btree_iter *bch2_trans_copy_iter(struct btree_trans *,
263 struct btree_iter *);
264 struct btree_iter *bch2_trans_get_node_iter(struct btree_trans *,
265 enum btree_id, struct bpos,
266 unsigned, unsigned, unsigned);
268 #define TRANS_RESET_NOTRAVERSE (1 << 0)
270 void bch2_trans_reset(struct btree_trans *, unsigned);
272 static inline void bch2_trans_begin(struct btree_trans *trans)
274 return bch2_trans_reset(trans, 0);
277 void *bch2_trans_kmalloc(struct btree_trans *, size_t);
278 void bch2_trans_init(struct btree_trans *, struct bch_fs *, unsigned, size_t);
279 int bch2_trans_exit(struct btree_trans *);
281 void bch2_fs_btree_iter_exit(struct bch_fs *);
282 int bch2_fs_btree_iter_init(struct bch_fs *);
284 #endif /* _BCACHEFS_BTREE_ITER_H */