From 9f0fc191371843c4fc000a226b0a26b6c059aacd Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sat, 18 May 2024 19:40:19 +0200 Subject: Merging upstream version 6.7.7. Signed-off-by: Daniel Baumann --- fs/bcachefs/btree_iter.h | 944 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 944 insertions(+) create mode 100644 fs/bcachefs/btree_iter.h (limited to 'fs/bcachefs/btree_iter.h') diff --git a/fs/bcachefs/btree_iter.h b/fs/bcachefs/btree_iter.h new file mode 100644 index 0000000000..eaffced4c1 --- /dev/null +++ b/fs/bcachefs/btree_iter.h @@ -0,0 +1,944 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _BCACHEFS_BTREE_ITER_H +#define _BCACHEFS_BTREE_ITER_H + +#include "bset.h" +#include "btree_types.h" +#include "trace.h" + +static inline int __bkey_err(const struct bkey *k) +{ + return PTR_ERR_OR_ZERO(k); +} + +#define bkey_err(_k) __bkey_err((_k).k) + +static inline void __btree_path_get(struct btree_path *path, bool intent) +{ + path->ref++; + path->intent_ref += intent; +} + +static inline bool __btree_path_put(struct btree_path *path, bool intent) +{ + EBUG_ON(!path->ref); + EBUG_ON(!path->intent_ref && intent); + path->intent_ref -= intent; + return --path->ref == 0; +} + +static inline void btree_path_set_dirty(struct btree_path *path, + enum btree_path_uptodate u) +{ + path->uptodate = max_t(unsigned, path->uptodate, u); +} + +static inline struct btree *btree_path_node(struct btree_path *path, + unsigned level) +{ + return level < BTREE_MAX_DEPTH ? path->l[level].b : NULL; +} + +static inline bool btree_node_lock_seq_matches(const struct btree_path *path, + const struct btree *b, unsigned level) +{ + return path->l[level].lock_seq == six_lock_seq(&b->c.lock); +} + +static inline struct btree *btree_node_parent(struct btree_path *path, + struct btree *b) +{ + return btree_path_node(path, b->c.level + 1); +} + +/* Iterate over paths within a transaction: */ + +void __bch2_btree_trans_sort_paths(struct btree_trans *); + +static inline void btree_trans_sort_paths(struct btree_trans *trans) +{ + if (!IS_ENABLED(CONFIG_BCACHEFS_DEBUG) && + trans->paths_sorted) + return; + __bch2_btree_trans_sort_paths(trans); +} + +static inline struct btree_path * +__trans_next_path(struct btree_trans *trans, unsigned idx) +{ + 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]; +} + +#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) +{ + 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); + return &trans->paths[*idx]; +} + +/* + * 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) \ + for (_idx = _start; \ + (_path = __trans_next_path_safe((_trans), &_idx)); \ + _idx++) + +#define trans_for_each_path_safe(_trans, _path, _idx) \ + trans_for_each_path_safe_from(_trans, _path, _idx, 0) + +static inline struct btree_path *next_btree_path(struct btree_trans *trans, struct btree_path *path) +{ + unsigned idx = path ? path->sorted_idx + 1 : 0; + + EBUG_ON(idx > trans->nr_sorted); + + return idx < trans->nr_sorted + ? trans->paths + trans->sorted[idx] + : NULL; +} + +static inline struct btree_path *prev_btree_path(struct btree_trans *trans, struct btree_path *path) +{ + unsigned idx = path ? path->sorted_idx : trans->nr_sorted; + + return idx + ? trans->paths + trans->sorted[idx - 1] + : 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_inorder_reverse(_trans, _path, _i) \ + for (_i = trans->nr_sorted - 1; \ + ((_path) = (_trans)->paths + trans->sorted[_i]), (_i) >= 0;\ + --_i) + +static inline bool __path_has_node(const struct btree_path *path, + const struct btree *b) +{ + return path->l[b->c.level].b == b && + btree_node_lock_seq_matches(path, b, b->c.level); +} + +static inline struct btree_path * +__trans_next_path_with_node(struct btree_trans *trans, struct btree *b, + unsigned idx) +{ + struct btree_path *path = __trans_next_path(trans, idx); + + while (path && !__path_has_node(path, b)) + path = __trans_next_path(trans, path->idx + 1); + + 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)) + +struct btree_path *__bch2_btree_path_make_mut(struct btree_trans *, struct btree_path *, + bool, unsigned long); + +static inline struct btree_path * __must_check +bch2_btree_path_make_mut(struct btree_trans *trans, + struct btree_path *path, bool intent, + unsigned long ip) +{ + if (path->ref > 1 || path->preserve) + path = __bch2_btree_path_make_mut(trans, path, intent, ip); + 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); + +static inline struct btree_path * __must_check +bch2_btree_path_set_pos(struct btree_trans *trans, + struct btree_path *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) + : path; +} + +int __must_check bch2_btree_path_traverse_one(struct btree_trans *, struct btree_path *, + unsigned, unsigned long); + +static inline int __must_check bch2_btree_path_traverse(struct btree_trans *trans, + struct btree_path *path, unsigned flags) +{ + if (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, + unsigned, unsigned, unsigned, unsigned long); +struct bkey_s_c bch2_btree_path_peek_slot(struct btree_path *, struct bkey *); + +/* + * bch2_btree_path_peek_slot() for a cached iterator might return a key in a + * different snapshot: + */ +static inline struct bkey_s_c bch2_btree_path_peek_slot_exact(struct btree_path *path, struct bkey *u) +{ + struct bkey_s_c k = bch2_btree_path_peek_slot(path, u); + + if (k.k && bpos_eq(path->pos, k.k->p)) + return k; + + bkey_init(u); + u->p = path->pos; + return (struct bkey_s_c) { u, NULL }; +} + +struct bkey_i *bch2_btree_journal_peek_slot(struct btree_trans *, + struct btree_iter *, struct bpos); + +void bch2_btree_path_level_init(struct btree_trans *, struct btree_path *, struct btree *); + +int __bch2_trans_mutex_lock(struct btree_trans *, struct mutex *); + +static inline int bch2_trans_mutex_lock(struct btree_trans *trans, struct mutex *lock) +{ + return mutex_trylock(lock) + ? 0 + : __bch2_trans_mutex_lock(trans, lock); +} + +#ifdef CONFIG_BCACHEFS_DEBUG +void bch2_trans_verify_paths(struct btree_trans *); +void bch2_assert_pos_locked(struct btree_trans *, enum btree_id, + struct bpos, bool); +#else +static inline void bch2_trans_verify_paths(struct btree_trans *trans) {} +static inline void bch2_assert_pos_locked(struct btree_trans *trans, enum btree_id id, + struct bpos pos, bool key_cache) {} +#endif + +void bch2_btree_path_fix_key_modified(struct btree_trans *trans, + struct btree *, struct bkey_packed *); +void bch2_btree_node_iter_fix(struct btree_trans *trans, struct btree_path *, + struct btree *, struct btree_node_iter *, + struct bkey_packed *, unsigned, unsigned); + +int bch2_btree_path_relock_intent(struct btree_trans *, struct btree_path *); + +void bch2_path_put(struct btree_trans *, struct btree_path *, bool); + +int bch2_trans_relock(struct btree_trans *); +int bch2_trans_relock_notrace(struct btree_trans *); +void bch2_trans_unlock(struct btree_trans *); +void bch2_trans_unlock_long(struct btree_trans *); +bool bch2_trans_locked(struct btree_trans *); + +static inline int trans_was_restarted(struct btree_trans *trans, u32 restart_count) +{ + return restart_count != trans->restart_count + ? -BCH_ERR_transaction_restart_nested + : 0; +} + +void __noreturn bch2_trans_restart_error(struct btree_trans *, u32); + +static inline void bch2_trans_verify_not_restarted(struct btree_trans *trans, + u32 restart_count) +{ + if (trans_was_restarted(trans, restart_count)) + bch2_trans_restart_error(trans, restart_count); +} + +void __noreturn bch2_trans_in_restart_error(struct btree_trans *); + +static inline void bch2_trans_verify_not_in_restart(struct btree_trans *trans) +{ + if (trans->restarted) + bch2_trans_in_restart_error(trans); +} + +__always_inline +static int btree_trans_restart_nounlock(struct btree_trans *trans, int err) +{ + BUG_ON(err <= 0); + BUG_ON(!bch2_err_matches(-err, BCH_ERR_transaction_restart)); + + trans->restarted = err; + trans->last_restarted_ip = _THIS_IP_; + return -err; +} + +__always_inline +static int btree_trans_restart(struct btree_trans *trans, int err) +{ + btree_trans_restart_nounlock(trans, err); + return -err; +} + +bool bch2_btree_node_upgrade(struct btree_trans *, + struct btree_path *, unsigned); + +void __bch2_btree_path_downgrade(struct btree_trans *, struct btree_path *, unsigned); + +static inline void bch2_btree_path_downgrade(struct btree_trans *trans, + struct btree_path *path) +{ + unsigned new_locks_want = path->level + !!path->intent_ref; + + if (path->locks_want > new_locks_want) + __bch2_btree_path_downgrade(trans, path, new_locks_want); +} + +void bch2_trans_downgrade(struct btree_trans *); + +void bch2_trans_node_add(struct btree_trans *trans, struct btree *); +void bch2_trans_node_reinit_iter(struct btree_trans *, struct btree *); + +int __must_check __bch2_btree_iter_traverse(struct btree_iter *iter); +int __must_check bch2_btree_iter_traverse(struct btree_iter *); + +struct btree *bch2_btree_iter_peek_node(struct btree_iter *); +struct btree *bch2_btree_iter_peek_node_and_restart(struct btree_iter *); +struct btree *bch2_btree_iter_next_node(struct btree_iter *); + +struct bkey_s_c bch2_btree_iter_peek_upto(struct btree_iter *, struct bpos); +struct bkey_s_c bch2_btree_iter_next(struct btree_iter *); + +struct bkey_s_c bch2_btree_iter_peek_all_levels(struct btree_iter *); + +static inline struct bkey_s_c bch2_btree_iter_peek(struct btree_iter *iter) +{ + return bch2_btree_iter_peek_upto(iter, SPOS_MAX); +} + +struct bkey_s_c bch2_btree_iter_peek_prev(struct btree_iter *); +struct bkey_s_c bch2_btree_iter_prev(struct btree_iter *); + +struct bkey_s_c bch2_btree_iter_peek_slot(struct btree_iter *); +struct bkey_s_c bch2_btree_iter_next_slot(struct btree_iter *); +struct bkey_s_c bch2_btree_iter_prev_slot(struct btree_iter *); + +bool bch2_btree_iter_advance(struct btree_iter *); +bool bch2_btree_iter_rewind(struct btree_iter *); + +static inline void __bch2_btree_iter_set_pos(struct btree_iter *iter, struct bpos new_pos) +{ + iter->k.type = KEY_TYPE_deleted; + iter->k.p.inode = iter->pos.inode = new_pos.inode; + iter->k.p.offset = iter->pos.offset = new_pos.offset; + iter->k.p.snapshot = iter->pos.snapshot = new_pos.snapshot; + iter->k.size = 0; +} + +static inline void bch2_btree_iter_set_pos(struct btree_iter *iter, struct bpos new_pos) +{ + if (unlikely(iter->update_path)) + bch2_path_put(iter->trans, iter->update_path, + iter->flags & BTREE_ITER_INTENT); + iter->update_path = NULL; + + if (!(iter->flags & BTREE_ITER_ALL_SNAPSHOTS)) + new_pos.snapshot = iter->snapshot; + + __bch2_btree_iter_set_pos(iter, new_pos); +} + +static inline void bch2_btree_iter_set_pos_to_extent_start(struct btree_iter *iter) +{ + BUG_ON(!(iter->flags & BTREE_ITER_IS_EXTENTS)); + iter->pos = bkey_start_pos(&iter->k); +} + +static inline void bch2_btree_iter_set_snapshot(struct btree_iter *iter, u32 snapshot) +{ + struct bpos pos = iter->pos; + + iter->snapshot = snapshot; + pos.snapshot = snapshot; + bch2_btree_iter_set_pos(iter, pos); +} + +void bch2_trans_iter_exit(struct btree_trans *, struct btree_iter *); + +static inline unsigned __bch2_btree_iter_flags(struct btree_trans *trans, + unsigned btree_id, + unsigned flags) +{ + if (flags & BTREE_ITER_ALL_LEVELS) + flags |= BTREE_ITER_ALL_SNAPSHOTS|__BTREE_ITER_ALL_SNAPSHOTS; + + if (!(flags & (BTREE_ITER_ALL_SNAPSHOTS|BTREE_ITER_NOT_EXTENTS)) && + btree_id_is_extents(btree_id)) + flags |= BTREE_ITER_IS_EXTENTS; + + if (!(flags & __BTREE_ITER_ALL_SNAPSHOTS) && + !btree_type_has_snapshot_field(btree_id)) + flags &= ~BTREE_ITER_ALL_SNAPSHOTS; + + if (!(flags & BTREE_ITER_ALL_SNAPSHOTS) && + btree_type_has_snapshots(btree_id)) + flags |= BTREE_ITER_FILTER_SNAPSHOTS; + + if (trans->journal_replay_not_finished) + flags |= BTREE_ITER_WITH_JOURNAL; + + return flags; +} + +static inline unsigned bch2_btree_iter_flags(struct btree_trans *trans, + unsigned btree_id, + unsigned flags) +{ + if (!btree_id_cached(trans->c, btree_id)) { + flags &= ~BTREE_ITER_CACHED; + flags &= ~BTREE_ITER_WITH_KEY_CACHE; + } else if (!(flags & BTREE_ITER_CACHED)) + flags |= BTREE_ITER_WITH_KEY_CACHE; + + return __bch2_btree_iter_flags(trans, btree_id, flags); +} + +static inline void bch2_trans_iter_init_common(struct btree_trans *trans, + struct btree_iter *iter, + unsigned btree_id, struct bpos pos, + unsigned locks_want, + unsigned depth, + unsigned flags, + unsigned long ip) +{ + memset(iter, 0, sizeof(*iter)); + iter->trans = trans; + iter->btree_id = btree_id; + iter->flags = flags; + iter->snapshot = pos.snapshot; + iter->pos = pos; + iter->k.p = pos; + +#ifdef CONFIG_BCACHEFS_DEBUG + iter->ip_allocated = ip; +#endif + iter->path = bch2_path_get(trans, btree_id, iter->pos, + locks_want, depth, flags, ip); +} + +void bch2_trans_iter_init_outlined(struct btree_trans *, struct btree_iter *, + enum btree_id, struct bpos, unsigned); + +static inline void bch2_trans_iter_init(struct btree_trans *trans, + struct btree_iter *iter, + unsigned btree_id, struct bpos pos, + unsigned flags) +{ + if (__builtin_constant_p(btree_id) && + __builtin_constant_p(flags)) + bch2_trans_iter_init_common(trans, iter, btree_id, pos, 0, 0, + bch2_btree_iter_flags(trans, btree_id, flags), + _THIS_IP_); + else + bch2_trans_iter_init_outlined(trans, iter, btree_id, pos, flags); +} + +void bch2_trans_node_iter_init(struct btree_trans *, struct btree_iter *, + enum btree_id, struct bpos, + unsigned, unsigned, unsigned); +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; +} + +void *__bch2_trans_kmalloc(struct btree_trans *, size_t); + +static inline void *bch2_trans_kmalloc(struct btree_trans *trans, size_t size) +{ + size = roundup(size, 8); + + if (likely(trans->mem_top + size <= trans->mem_bytes)) { + void *p = trans->mem + trans->mem_top; + + trans->mem_top += size; + memset(p, 0, size); + return p; + } else { + return __bch2_trans_kmalloc(trans, size); + } +} + +static inline void *bch2_trans_kmalloc_nomemzero(struct btree_trans *trans, size_t size) +{ + size = roundup(size, 8); + + if (likely(trans->mem_top + size <= trans->mem_bytes)) { + void *p = trans->mem + trans->mem_top; + + trans->mem_top += size; + return p; + } else { + return __bch2_trans_kmalloc(trans, size); + } +} + +static inline struct bkey_s_c __bch2_bkey_get_iter(struct btree_trans *trans, + struct btree_iter *iter, + unsigned btree_id, struct bpos pos, + unsigned flags, unsigned type) +{ + struct bkey_s_c k; + + bch2_trans_iter_init(trans, iter, btree_id, pos, flags); + k = bch2_btree_iter_peek_slot(iter); + + if (!bkey_err(k) && type && k.k->type != type) + k = bkey_s_c_err(-BCH_ERR_ENOENT_bkey_type_mismatch); + if (unlikely(bkey_err(k))) + bch2_trans_iter_exit(trans, iter); + return k; +} + +static inline struct bkey_s_c bch2_bkey_get_iter(struct btree_trans *trans, + struct btree_iter *iter, + unsigned btree_id, struct bpos pos, + unsigned flags) +{ + return __bch2_bkey_get_iter(trans, iter, btree_id, pos, flags, 0); +} + +#define bch2_bkey_get_iter_typed(_trans, _iter, _btree_id, _pos, _flags, _type)\ + bkey_s_c_to_##_type(__bch2_bkey_get_iter(_trans, _iter, \ + _btree_id, _pos, _flags, KEY_TYPE_##_type)) + +static inline int __bch2_bkey_get_val_typed(struct btree_trans *trans, + unsigned btree_id, struct bpos pos, + unsigned flags, unsigned type, + unsigned val_size, void *val) +{ + struct btree_iter iter; + struct bkey_s_c k; + int ret; + + k = __bch2_bkey_get_iter(trans, &iter, btree_id, pos, flags, type); + ret = bkey_err(k); + if (!ret) { + unsigned b = min_t(unsigned, bkey_val_bytes(k.k), val_size); + + memcpy(val, k.v, b); + if (unlikely(b < sizeof(*val))) + memset((void *) val + b, 0, sizeof(*val) - b); + bch2_trans_iter_exit(trans, &iter); + } + + return ret; +} + +#define bch2_bkey_get_val_typed(_trans, _btree_id, _pos, _flags, _type, _val)\ + __bch2_bkey_get_val_typed(_trans, _btree_id, _pos, _flags, \ + 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 *); + +/* + * XXX + * this does not handle transaction restarts from bch2_btree_iter_next_node() + * correctly + */ +#define __for_each_btree_node(_trans, _iter, _btree_id, _start, \ + _locks_want, _depth, _flags, _b, _ret) \ + for (bch2_trans_node_iter_init((_trans), &(_iter), (_btree_id), \ + _start, _locks_want, _depth, _flags); \ + (_b) = bch2_btree_iter_peek_node_and_restart(&(_iter)), \ + !((_ret) = PTR_ERR_OR_ZERO(_b)) && (_b); \ + (_b) = bch2_btree_iter_next_node(&(_iter))) + +#define for_each_btree_node(_trans, _iter, _btree_id, _start, \ + _flags, _b, _ret) \ + __for_each_btree_node(_trans, _iter, _btree_id, _start, \ + 0, 0, _flags, _b, _ret) + +static inline struct bkey_s_c bch2_btree_iter_peek_prev_type(struct btree_iter *iter, + unsigned flags) +{ + BUG_ON(flags & BTREE_ITER_ALL_LEVELS); + + return flags & BTREE_ITER_SLOTS ? bch2_btree_iter_peek_slot(iter) : + bch2_btree_iter_peek_prev(iter); +} + +static inline struct bkey_s_c bch2_btree_iter_peek_type(struct btree_iter *iter, + unsigned flags) +{ + return flags & BTREE_ITER_ALL_LEVELS ? bch2_btree_iter_peek_all_levels(iter) : + flags & BTREE_ITER_SLOTS ? bch2_btree_iter_peek_slot(iter) : + bch2_btree_iter_peek(iter); +} + +static inline struct bkey_s_c bch2_btree_iter_peek_upto_type(struct btree_iter *iter, + struct bpos end, + unsigned flags) +{ + if (!(flags & BTREE_ITER_SLOTS)) + return bch2_btree_iter_peek_upto(iter, end); + + if (bkey_gt(iter->pos, end)) + return bkey_s_c_null; + + return bch2_btree_iter_peek_slot(iter); +} + +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); + } + + 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; +} + +#define lockrestart_do(_trans, _do) \ +({ \ + u32 _restart_count; \ + int _ret2; \ + \ + do { \ + _restart_count = bch2_trans_begin(_trans); \ + _ret2 = (_do); \ + } while (bch2_err_matches(_ret2, BCH_ERR_transaction_restart)); \ + \ + if (!_ret2) \ + bch2_trans_verify_not_restarted(_trans, _restart_count);\ + \ + _ret2; \ +}) + +/* + * nested_lockrestart_do(), nested_commit_do(): + * + * These are like lockrestart_do() and commit_do(), with two differences: + * + * - We don't call bch2_trans_begin() unless we had a transaction restart + * - We return -BCH_ERR_transaction_restart_nested if we succeeded after a + * transaction restart + */ +#define nested_lockrestart_do(_trans, _do) \ +({ \ + u32 _restart_count, _orig_restart_count; \ + int _ret2; \ + \ + _restart_count = _orig_restart_count = (_trans)->restart_count; \ + \ + while (bch2_err_matches(_ret2 = (_do), BCH_ERR_transaction_restart))\ + _restart_count = bch2_trans_begin(_trans); \ + \ + if (!_ret2) \ + bch2_trans_verify_not_restarted(_trans, _restart_count);\ + \ + _ret2 ?: trans_was_restarted(_trans, _restart_count); \ +}) + +#define for_each_btree_key2(_trans, _iter, _btree_id, \ + _start, _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_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_advance(&(_iter))) \ + break; \ + } \ + \ + 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_reverse(_trans, _iter, _btree_id, \ + _start, _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); \ + (_k) = bch2_btree_iter_peek_prev_type(&(_iter), (_flags));\ + if (!(_k).k) { \ + _ret3 = 0; \ + 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; \ + } \ + \ + bch2_trans_iter_exit((_trans), &(_iter)); \ + _ret3; \ +}) + +#define for_each_btree_key_commit(_trans, _iter, _btree_id, \ + _start, _iter_flags, _k, \ + _disk_res, _journal_seq, _commit_flags,\ + _do) \ + for_each_btree_key2(_trans, _iter, _btree_id, _start, _iter_flags, _k,\ + (_do) ?: bch2_trans_commit(_trans, (_disk_res),\ + (_journal_seq), (_commit_flags))) + +#define for_each_btree_key_reverse_commit(_trans, _iter, _btree_id, \ + _start, _iter_flags, _k, \ + _disk_res, _journal_seq, _commit_flags,\ + _do) \ + for_each_btree_key_reverse(_trans, _iter, _btree_id, _start, _iter_flags, _k,\ + (_do) ?: bch2_trans_commit(_trans, (_disk_res),\ + (_journal_seq), (_commit_flags))) + +#define for_each_btree_key_upto_commit(_trans, _iter, _btree_id, \ + _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,\ + (_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))) + +#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))) + +#define for_each_btree_key_norestart(_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), \ + !((_ret) = bkey_err(_k)) && (_k).k; \ + bch2_btree_iter_advance(&(_iter))) + +#define for_each_btree_key_upto_norestart(_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_type(&(_iter), _end, _flags),\ + !((_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 drop_locks_do(_trans, _do) \ +({ \ + bch2_trans_unlock(_trans); \ + _do ?: bch2_trans_relock(_trans); \ +}) + +#define allocate_dropping_locks_errcode(_trans, _do) \ +({ \ + gfp_t _gfp = GFP_NOWAIT|__GFP_NOWARN; \ + int _ret = _do; \ + \ + if (bch2_err_matches(_ret, ENOMEM)) { \ + _gfp = GFP_KERNEL; \ + _ret = drop_locks_do(trans, _do); \ + } \ + _ret; \ +}) + +#define allocate_dropping_locks(_trans, _ret, _do) \ +({ \ + gfp_t _gfp = GFP_NOWAIT|__GFP_NOWARN; \ + typeof(_do) _p = _do; \ + \ + _ret = 0; \ + if (unlikely(!_p)) { \ + _gfp = GFP_KERNEL; \ + _ret = drop_locks_do(trans, ((_p = _do), 0)); \ + } \ + _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 *); + +struct btree_trans *__bch2_trans_get(struct bch_fs *, unsigned); +void bch2_trans_put(struct btree_trans *); + +extern const char *bch2_btree_transaction_fns[BCH_TRANSACTIONS_NR]; +unsigned bch2_trans_get_fn_idx(const char *); + +#define bch2_trans_get(_c) \ +({ \ + static unsigned trans_fn_idx; \ + \ + if (unlikely(!trans_fn_idx)) \ + trans_fn_idx = bch2_trans_get_fn_idx(__func__); \ + __bch2_trans_get(_c, trans_fn_idx); \ +}) + +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 */ -- cgit v1.2.3