X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=libbcachefs%2Fbtree_iter.h;h=24772538e4cc74ada59851bd7847dd5ece5ea122;hb=HEAD;hp=a4fec7cce911cb2878ed6ee181a8162bb057c0b0;hpb=06611a71a35a1b14efe192454aabf3a01b4804d4;p=bcachefs-tools-debian diff --git a/libbcachefs/btree_iter.h b/libbcachefs/btree_iter.h index a4fec7c..2477253 100644 --- a/libbcachefs/btree_iter.h +++ b/libbcachefs/btree_iter.h @@ -63,60 +63,57 @@ static inline void btree_trans_sort_paths(struct btree_trans *trans) __bch2_btree_trans_sort_paths(trans); } -static inline struct btree_path * -__trans_next_path(struct btree_trans *trans, unsigned idx) +static inline unsigned long *trans_paths_nr(struct btree_path *paths) { - u64 l; - - if (idx == BTREE_ITER_MAX) - return NULL; - - l = trans->paths_allocated >> idx; - if (!l) - return NULL; - - idx += __ffs64(l); - EBUG_ON(idx >= BTREE_ITER_MAX); - EBUG_ON(trans->paths[idx].idx != idx); - return &trans->paths[idx]; + return &container_of(paths, struct btree_trans_paths, paths[0])->nr_paths; } -#define trans_for_each_path_from(_trans, _path, _start) \ - for (_path = __trans_next_path((_trans), _start); \ - (_path); \ - _path = __trans_next_path((_trans), (_path)->idx + 1)) - -#define trans_for_each_path(_trans, _path) \ - trans_for_each_path_from(_trans, _path, 0) - -static inline struct btree_path * -__trans_next_path_safe(struct btree_trans *trans, unsigned *idx) +static inline unsigned long *trans_paths_allocated(struct btree_path *paths) { - u64 l; + unsigned long *v = trans_paths_nr(paths); + return v - BITS_TO_LONGS(*v); +} - if (*idx == BTREE_ITER_MAX) - return NULL; +#define trans_for_each_path_idx_from(_paths_allocated, _nr, _idx, _start)\ + for (_idx = _start; \ + (_idx = find_next_bit(_paths_allocated, _nr, _idx)) < _nr; \ + _idx++) - l = trans->paths_allocated >> *idx; - if (!l) - return NULL; +static inline struct btree_path * +__trans_next_path(struct btree_trans *trans, unsigned *idx) +{ + unsigned long *w = trans->paths_allocated + *idx / BITS_PER_LONG; + /* + * Open coded find_next_bit(), because + * - this is fast path, we can't afford the function call + * - and we know that nr_paths is a multiple of BITS_PER_LONG, + */ + while (*idx < trans->nr_paths) { + unsigned long v = *w >> (*idx & (BITS_PER_LONG - 1)); + if (v) { + *idx += __ffs(v); + return trans->paths + *idx; + } + + *idx += BITS_PER_LONG; + *idx &= ~(BITS_PER_LONG - 1); + w++; + } - *idx += __ffs64(l); - EBUG_ON(*idx >= BTREE_ITER_MAX); - return &trans->paths[*idx]; + return NULL; } /* * This version is intended to be safe for use on a btree_trans that is owned by * another thread, for bch2_btree_trans_to_text(); */ -#define trans_for_each_path_safe_from(_trans, _path, _idx, _start) \ +#define trans_for_each_path_from(_trans, _path, _idx, _start) \ for (_idx = _start; \ - (_path = __trans_next_path_safe((_trans), &_idx)); \ + (_path = __trans_next_path((_trans), &_idx)); \ _idx++) -#define trans_for_each_path_safe(_trans, _path, _idx) \ - trans_for_each_path_safe_from(_trans, _path, _idx, 0) +#define trans_for_each_path(_trans, _path, _idx) \ + trans_for_each_path_from(_trans, _path, _idx, 1) static inline struct btree_path *next_btree_path(struct btree_trans *trans, struct btree_path *path) { @@ -138,10 +135,23 @@ static inline struct btree_path *prev_btree_path(struct btree_trans *trans, stru : NULL; } -#define trans_for_each_path_inorder(_trans, _path, _i) \ - for (_i = 0; \ - ((_path) = (_trans)->paths + trans->sorted[_i]), (_i) < (_trans)->nr_sorted;\ - _i++) +#define trans_for_each_path_idx_inorder(_trans, _iter) \ + for (_iter = (struct trans_for_each_path_inorder_iter) { 0 }; \ + (_iter.path_idx = trans->sorted[_iter.sorted_idx], \ + _iter.sorted_idx < (_trans)->nr_sorted); \ + _iter.sorted_idx++) + +struct trans_for_each_path_inorder_iter { + btree_path_idx_t sorted_idx; + btree_path_idx_t path_idx; +}; + +#define trans_for_each_path_inorder(_trans, _path, _iter) \ + for (_iter = (struct trans_for_each_path_inorder_iter) { 0 }; \ + (_iter.path_idx = trans->sorted[_iter.sorted_idx], \ + _path = (_trans)->paths + _iter.path_idx, \ + _iter.sorted_idx < (_trans)->nr_sorted); \ + _iter.sorted_idx++) #define trans_for_each_path_inorder_reverse(_trans, _path, _i) \ for (_i = trans->nr_sorted - 1; \ @@ -157,67 +167,65 @@ static inline bool __path_has_node(const struct btree_path *path, static inline struct btree_path * __trans_next_path_with_node(struct btree_trans *trans, struct btree *b, - unsigned idx) + unsigned *idx) { - struct btree_path *path = __trans_next_path(trans, idx); + struct btree_path *path; - while (path && !__path_has_node(path, b)) - path = __trans_next_path(trans, path->idx + 1); + while ((path = __trans_next_path(trans, idx)) && + !__path_has_node(path, b)) + (*idx)++; return path; } -#define trans_for_each_path_with_node(_trans, _b, _path) \ - for (_path = __trans_next_path_with_node((_trans), (_b), 0); \ - (_path); \ - _path = __trans_next_path_with_node((_trans), (_b), \ - (_path)->idx + 1)) +#define trans_for_each_path_with_node(_trans, _b, _path, _iter) \ + for (_iter = 1; \ + (_path = __trans_next_path_with_node((_trans), (_b), &_iter));\ + _iter++) -struct btree_path *__bch2_btree_path_make_mut(struct btree_trans *, struct btree_path *, - bool, unsigned long); +btree_path_idx_t __bch2_btree_path_make_mut(struct btree_trans *, btree_path_idx_t, + bool, unsigned long); -static inline struct btree_path * __must_check +static inline btree_path_idx_t __must_check bch2_btree_path_make_mut(struct btree_trans *trans, - struct btree_path *path, bool intent, + btree_path_idx_t path, bool intent, unsigned long ip) { - if (path->ref > 1 || path->preserve) + if (trans->paths[path].ref > 1 || + trans->paths[path].preserve) path = __bch2_btree_path_make_mut(trans, path, intent, ip); - path->should_be_locked = false; + trans->paths[path].should_be_locked = false; return path; } -struct btree_path * __must_check -__bch2_btree_path_set_pos(struct btree_trans *, struct btree_path *, - struct bpos, bool, unsigned long, int); +btree_path_idx_t __must_check +__bch2_btree_path_set_pos(struct btree_trans *, btree_path_idx_t, + struct bpos, bool, unsigned long); -static inline struct btree_path * __must_check +static inline btree_path_idx_t __must_check bch2_btree_path_set_pos(struct btree_trans *trans, - struct btree_path *path, struct bpos new_pos, - bool intent, unsigned long ip) + btree_path_idx_t path, struct bpos new_pos, + bool intent, unsigned long ip) { - int cmp = bpos_cmp(new_pos, path->pos); - - return cmp - ? __bch2_btree_path_set_pos(trans, path, new_pos, intent, ip, cmp) + return !bpos_eq(new_pos, trans->paths[path].pos) + ? __bch2_btree_path_set_pos(trans, path, new_pos, intent, ip) : path; } -int __must_check bch2_btree_path_traverse_one(struct btree_trans *, struct btree_path *, +int __must_check bch2_btree_path_traverse_one(struct btree_trans *, + btree_path_idx_t, unsigned, unsigned long); static inline int __must_check bch2_btree_path_traverse(struct btree_trans *trans, - struct btree_path *path, unsigned flags) + btree_path_idx_t path, unsigned flags) { - if (path->uptodate < BTREE_ITER_NEED_RELOCK) + if (trans->paths[path].uptodate < BTREE_ITER_NEED_RELOCK) return 0; return bch2_btree_path_traverse_one(trans, path, flags, _RET_IP_); } -int __must_check bch2_btree_path_traverse(struct btree_trans *, - struct btree_path *, unsigned); -struct btree_path *bch2_path_get(struct btree_trans *, enum btree_id, struct bpos, +btree_path_idx_t bch2_path_get(struct btree_trans *, enum btree_id, struct bpos, unsigned, unsigned, unsigned, unsigned long); struct bkey_s_c bch2_btree_path_peek_slot(struct btree_path *, struct bkey *); @@ -269,7 +277,7 @@ void bch2_btree_node_iter_fix(struct btree_trans *trans, struct btree_path *, int bch2_btree_path_relock_intent(struct btree_trans *, struct btree_path *); -void bch2_path_put(struct btree_trans *, struct btree_path *, bool); +void bch2_path_put(struct btree_trans *, btree_path_idx_t, bool); int bch2_trans_relock(struct btree_trans *); int bch2_trans_relock_notrace(struct btree_trans *); @@ -335,7 +343,7 @@ static inline void bch2_btree_path_downgrade(struct btree_trans *trans, void bch2_trans_downgrade(struct btree_trans *); -void bch2_trans_node_add(struct btree_trans *trans, struct btree *); +void bch2_trans_node_add(struct btree_trans *trans, struct btree_path *, struct btree *); void bch2_trans_node_reinit_iter(struct btree_trans *, struct btree *); int __must_check __bch2_btree_iter_traverse(struct btree_iter *iter); @@ -374,10 +382,12 @@ static inline void __bch2_btree_iter_set_pos(struct btree_iter *iter, struct bpo static inline void bch2_btree_iter_set_pos(struct btree_iter *iter, struct bpos new_pos) { + struct btree_trans *trans = iter->trans; + if (unlikely(iter->update_path)) - bch2_path_put(iter->trans, iter->update_path, + bch2_path_put(trans, iter->update_path, iter->flags & BTREE_ITER_INTENT); - iter->update_path = NULL; + iter->update_path = 0; if (!(iter->flags & BTREE_ITER_ALL_SNAPSHOTS)) new_pos.snapshot = iter->snapshot; @@ -446,8 +456,8 @@ static inline void bch2_trans_iter_init_common(struct btree_trans *trans, unsigned long ip) { iter->trans = trans; - iter->update_path = NULL; - iter->key_cache_path = NULL; + iter->update_path = 0; + iter->key_cache_path = 0; iter->btree_id = btree_id; iter->min_depth = 0; iter->flags = flags; @@ -486,8 +496,10 @@ void bch2_trans_copy_iter(struct btree_iter *, struct btree_iter *); static inline void set_btree_iter_dontneed(struct btree_iter *iter) { - if (!iter->trans->restarted) - iter->path->preserve = false; + struct btree_trans *trans = iter->trans; + + if (!trans->restarted) + btree_iter_path(trans, iter)->preserve = false; } void *__bch2_trans_kmalloc(struct btree_trans *, size_t); @@ -509,7 +521,7 @@ static inline void *bch2_trans_kmalloc(struct btree_trans *trans, size_t size) static inline void *bch2_trans_kmalloc_nomemzero(struct btree_trans *trans, size_t size) { - size = roundup(size, 8); + size = round_up(size, 8); if (likely(trans->mem_top + size <= trans->mem_bytes)) { void *p = trans->mem + trans->mem_top; @@ -578,7 +590,6 @@ static inline int __bch2_bkey_get_val_typed(struct btree_trans *trans, KEY_TYPE_##_type, sizeof(*_val), _val) void bch2_trans_srcu_unlock(struct btree_trans *); -void bch2_trans_srcu_lock(struct btree_trans *); u32 bch2_trans_begin(struct btree_trans *); @@ -627,61 +638,34 @@ static inline struct bkey_s_c bch2_btree_iter_peek_upto_type(struct btree_iter * return bch2_btree_iter_peek_slot(iter); } +int __bch2_btree_trans_too_many_iters(struct btree_trans *); + static inline int btree_trans_too_many_iters(struct btree_trans *trans) { - if (hweight64(trans->paths_allocated) > BTREE_ITER_MAX - 8) { - trace_and_count(trans->c, trans_restart_too_many_iters, trans, _THIS_IP_); - return btree_trans_restart(trans, BCH_ERR_transaction_restart_too_many_iters); - } + if (bitmap_weight(trans->paths_allocated, trans->nr_paths) > BTREE_ITER_INITIAL - 8) + return __bch2_btree_trans_too_many_iters(trans); return 0; } -struct bkey_s_c bch2_btree_iter_peek_and_restart_outlined(struct btree_iter *); - -static inline struct bkey_s_c -__bch2_btree_iter_peek_and_restart(struct btree_trans *trans, - struct btree_iter *iter, unsigned flags) -{ - struct bkey_s_c k; - - while (btree_trans_too_many_iters(trans) || - (k = bch2_btree_iter_peek_type(iter, flags), - bch2_err_matches(bkey_err(k), BCH_ERR_transaction_restart))) - bch2_trans_begin(trans); - - return k; -} - -static inline struct bkey_s_c -__bch2_btree_iter_peek_upto_and_restart(struct btree_trans *trans, - struct btree_iter *iter, - struct bpos end, - unsigned flags) -{ - struct bkey_s_c k; - - while (btree_trans_too_many_iters(trans) || - (k = bch2_btree_iter_peek_upto_type(iter, end, flags), - bch2_err_matches(bkey_err(k), BCH_ERR_transaction_restart))) - bch2_trans_begin(trans); - - return k; -} - +/* + * goto instead of loop, so that when used inside for_each_btree_key2() + * break/continue work correctly + */ #define lockrestart_do(_trans, _do) \ ({ \ + __label__ transaction_restart; \ u32 _restart_count; \ int _ret2; \ +transaction_restart: \ + _restart_count = bch2_trans_begin(_trans); \ + _ret2 = (_do); \ \ - do { \ - _restart_count = bch2_trans_begin(_trans); \ - _ret2 = (_do); \ - } while (bch2_err_matches(_ret2, BCH_ERR_transaction_restart)); \ + if (bch2_err_matches(_ret2, BCH_ERR_transaction_restart)) \ + goto transaction_restart; \ \ if (!_ret2) \ bch2_trans_verify_not_restarted(_trans, _restart_count);\ - \ _ret2; \ }) @@ -710,91 +694,56 @@ __bch2_btree_iter_peek_upto_and_restart(struct btree_trans *trans, _ret2 ?: trans_was_restarted(_trans, _restart_count); \ }) -#define for_each_btree_key2(_trans, _iter, _btree_id, \ - _start, _flags, _k, _do) \ +#define for_each_btree_key_upto(_trans, _iter, _btree_id, \ + _start, _end, _flags, _k, _do) \ ({ \ + struct btree_iter _iter; \ + struct bkey_s_c _k; \ int _ret3 = 0; \ \ bch2_trans_iter_init((_trans), &(_iter), (_btree_id), \ (_start), (_flags)); \ \ - while (1) { \ - u32 _restart_count = bch2_trans_begin(_trans); \ - \ - _ret3 = 0; \ - (_k) = bch2_btree_iter_peek_type(&(_iter), (_flags)); \ - if (!(_k).k) \ - break; \ + do { \ + _ret3 = lockrestart_do(_trans, ({ \ + (_k) = bch2_btree_iter_peek_upto_type(&(_iter), \ + _end, (_flags)); \ + if (!(_k).k) \ + break; \ \ - _ret3 = bkey_err(_k) ?: (_do); \ - if (bch2_err_matches(_ret3, BCH_ERR_transaction_restart))\ - continue; \ - if (_ret3) \ - break; \ - bch2_trans_verify_not_restarted(_trans, _restart_count);\ - if (!bch2_btree_iter_advance(&(_iter))) \ - break; \ - } \ + bkey_err(_k) ?: (_do); \ + })); \ + } while (!_ret3 && bch2_btree_iter_advance(&(_iter))); \ \ bch2_trans_iter_exit((_trans), &(_iter)); \ _ret3; \ }) -#define for_each_btree_key2_upto(_trans, _iter, _btree_id, \ - _start, _end, _flags, _k, _do) \ -({ \ - int _ret3 = 0; \ - \ - bch2_trans_iter_init((_trans), &(_iter), (_btree_id), \ - (_start), (_flags)); \ - \ - while (1) { \ - u32 _restart_count = bch2_trans_begin(_trans); \ - \ - _ret3 = 0; \ - (_k) = bch2_btree_iter_peek_upto_type(&(_iter), _end, (_flags));\ - if (!(_k).k) \ - break; \ - \ - _ret3 = bkey_err(_k) ?: (_do); \ - if (bch2_err_matches(_ret3, BCH_ERR_transaction_restart))\ - continue; \ - if (_ret3) \ - break; \ - bch2_trans_verify_not_restarted(_trans, _restart_count);\ - if (!bch2_btree_iter_advance(&(_iter))) \ - break; \ - } \ - \ - bch2_trans_iter_exit((_trans), &(_iter)); \ - _ret3; \ -}) +#define for_each_btree_key(_trans, _iter, _btree_id, \ + _start, _flags, _k, _do) \ + for_each_btree_key_upto(_trans, _iter, _btree_id, _start, \ + SPOS_MAX, _flags, _k, _do) #define for_each_btree_key_reverse(_trans, _iter, _btree_id, \ _start, _flags, _k, _do) \ ({ \ + struct btree_iter _iter; \ + struct bkey_s_c _k; \ int _ret3 = 0; \ \ bch2_trans_iter_init((_trans), &(_iter), (_btree_id), \ (_start), (_flags)); \ \ - while (1) { \ - u32 _restart_count = bch2_trans_begin(_trans); \ - (_k) = bch2_btree_iter_peek_prev_type(&(_iter), (_flags));\ - if (!(_k).k) { \ - _ret3 = 0; \ - break; \ - } \ + do { \ + _ret3 = lockrestart_do(_trans, ({ \ + (_k) = bch2_btree_iter_peek_prev_type(&(_iter), \ + (_flags)); \ + if (!(_k).k) \ + break; \ \ - _ret3 = bkey_err(_k) ?: (_do); \ - if (bch2_err_matches(_ret3, BCH_ERR_transaction_restart))\ - continue; \ - if (_ret3) \ - break; \ - bch2_trans_verify_not_restarted(_trans, _restart_count);\ - if (!bch2_btree_iter_rewind(&(_iter))) \ - break; \ - } \ + bkey_err(_k) ?: (_do); \ + })); \ + } while (!_ret3 && bch2_btree_iter_rewind(&(_iter))); \ \ bch2_trans_iter_exit((_trans), &(_iter)); \ _ret3; \ @@ -804,7 +753,7 @@ __bch2_btree_iter_peek_upto_and_restart(struct btree_trans *trans, _start, _iter_flags, _k, \ _disk_res, _journal_seq, _commit_flags,\ _do) \ - for_each_btree_key2(_trans, _iter, _btree_id, _start, _iter_flags, _k,\ + for_each_btree_key(_trans, _iter, _btree_id, _start, _iter_flags, _k,\ (_do) ?: bch2_trans_commit(_trans, (_disk_res),\ (_journal_seq), (_commit_flags))) @@ -820,32 +769,31 @@ __bch2_btree_iter_peek_upto_and_restart(struct btree_trans *trans, _start, _end, _iter_flags, _k, \ _disk_res, _journal_seq, _commit_flags,\ _do) \ - for_each_btree_key2_upto(_trans, _iter, _btree_id, _start, _end, _iter_flags, _k,\ + for_each_btree_key_upto(_trans, _iter, _btree_id, _start, _end, _iter_flags, _k,\ (_do) ?: bch2_trans_commit(_trans, (_disk_res),\ (_journal_seq), (_commit_flags))) -#define for_each_btree_key(_trans, _iter, _btree_id, \ - _start, _flags, _k, _ret) \ - for (bch2_trans_iter_init((_trans), &(_iter), (_btree_id), \ - (_start), (_flags)); \ - (_k) = __bch2_btree_iter_peek_and_restart((_trans), &(_iter), _flags),\ - !((_ret) = bkey_err(_k)) && (_k).k; \ - bch2_btree_iter_advance(&(_iter))) +struct bkey_s_c bch2_btree_iter_peek_and_restart_outlined(struct btree_iter *); -#define for_each_btree_key_upto(_trans, _iter, _btree_id, \ - _start, _end, _flags, _k, _ret) \ - for (bch2_trans_iter_init((_trans), &(_iter), (_btree_id), \ - (_start), (_flags)); \ - (_k) = __bch2_btree_iter_peek_upto_and_restart((_trans), \ - &(_iter), _end, _flags),\ - !((_ret) = bkey_err(_k)) && (_k).k; \ - bch2_btree_iter_advance(&(_iter))) +static inline struct bkey_s_c +__bch2_btree_iter_peek_and_restart(struct btree_trans *trans, + struct btree_iter *iter, unsigned flags) +{ + struct bkey_s_c k; -#define for_each_btree_key_norestart(_trans, _iter, _btree_id, \ + while (btree_trans_too_many_iters(trans) || + (k = bch2_btree_iter_peek_type(iter, flags), + bch2_err_matches(bkey_err(k), BCH_ERR_transaction_restart))) + bch2_trans_begin(trans); + + return k; +} + +#define for_each_btree_key_old(_trans, _iter, _btree_id, \ _start, _flags, _k, _ret) \ for (bch2_trans_iter_init((_trans), &(_iter), (_btree_id), \ (_start), (_flags)); \ - (_k) = bch2_btree_iter_peek_type(&(_iter), _flags), \ + (_k) = __bch2_btree_iter_peek_and_restart((_trans), &(_iter), _flags),\ !((_ret) = bkey_err(_k)) && (_k).k; \ bch2_btree_iter_advance(&(_iter))) @@ -857,24 +805,25 @@ __bch2_btree_iter_peek_upto_and_restart(struct btree_trans *trans, !((_ret) = bkey_err(_k)) && (_k).k; \ bch2_btree_iter_advance(&(_iter))) -#define for_each_btree_key_continue(_trans, _iter, _flags, _k, _ret) \ - for (; \ - (_k) = __bch2_btree_iter_peek_and_restart((_trans), &(_iter), _flags),\ - !((_ret) = bkey_err(_k)) && (_k).k; \ - bch2_btree_iter_advance(&(_iter))) - -#define for_each_btree_key_continue_norestart(_iter, _flags, _k, _ret) \ - for (; \ - (_k) = bch2_btree_iter_peek_type(&(_iter), _flags), \ - !((_ret) = bkey_err(_k)) && (_k).k; \ - bch2_btree_iter_advance(&(_iter))) - #define for_each_btree_key_upto_continue_norestart(_iter, _end, _flags, _k, _ret)\ for (; \ (_k) = bch2_btree_iter_peek_upto_type(&(_iter), _end, _flags), \ !((_ret) = bkey_err(_k)) && (_k).k; \ bch2_btree_iter_advance(&(_iter))) +#define for_each_btree_key_norestart(_trans, _iter, _btree_id, \ + _start, _flags, _k, _ret) \ + for_each_btree_key_upto_norestart(_trans, _iter, _btree_id, _start,\ + SPOS_MAX, _flags, _k, _ret) + +#define for_each_btree_key_continue_norestart(_iter, _flags, _k, _ret) \ + for_each_btree_key_upto_continue_norestart(_iter, SPOS_MAX, _flags, _k, _ret) + +/* + * This should not be used in a fastpath, without first trying _do in + * nonblocking mode - it will cause excessive transaction restarts and + * potentially livelocking: + */ #define drop_locks_do(_trans, _do) \ ({ \ bch2_trans_unlock(_trans); \ @@ -906,10 +855,7 @@ __bch2_btree_iter_peek_upto_and_restart(struct btree_trans *trans, _p; \ }) -/* new multiple iterator interface: */ - void bch2_trans_updates_to_text(struct printbuf *, struct btree_trans *); -void bch2_btree_path_to_text(struct printbuf *, struct btree_path *); void bch2_trans_paths_to_text(struct printbuf *, struct btree_trans *); void bch2_dump_trans_updates(struct btree_trans *); void bch2_dump_trans_paths_updates(struct btree_trans *); @@ -932,6 +878,7 @@ unsigned bch2_trans_get_fn_idx(const char *); void bch2_btree_trans_to_text(struct printbuf *, struct btree_trans *); void bch2_fs_btree_iter_exit(struct bch_fs *); +void bch2_fs_btree_iter_init_early(struct bch_fs *); int bch2_fs_btree_iter_init(struct bch_fs *); #endif /* _BCACHEFS_BTREE_ITER_H */