diff options
Diffstat (limited to 'libbcachefs/btree_update.c')
| -rw-r--r-- | libbcachefs/btree_update.c | 943 |
1 files changed, 943 insertions, 0 deletions
diff --git a/libbcachefs/btree_update.c b/libbcachefs/btree_update.c new file mode 100644 index 00000000..612fba60 --- /dev/null +++ b/libbcachefs/btree_update.c @@ -0,0 +1,943 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include "bcachefs.h" +#include "btree_update.h" +#include "btree_iter.h" +#include "btree_journal_iter.h" +#include "btree_locking.h" +#include "buckets.h" +#include "debug.h" +#include "errcode.h" +#include "error.h" +#include "extents.h" +#include "keylist.h" +#include "subvolume.h" +#include "trace.h" + +static inline int btree_insert_entry_cmp(const struct btree_insert_entry *l, + const struct btree_insert_entry *r) +{ + return cmp_int(l->btree_id, r->btree_id) ?: + cmp_int(l->cached, r->cached) ?: + -cmp_int(l->level, r->level) ?: + bpos_cmp(l->k->k.p, r->k->k.p); +} + +static int __must_check +bch2_trans_update_by_path(struct btree_trans *, struct btree_path *, + struct bkey_i *, enum btree_update_flags, + unsigned long ip); + +static noinline int __check_pos_snapshot_overwritten(struct btree_trans *trans, + enum btree_id id, + struct bpos pos) +{ + struct bch_fs *c = trans->c; + struct btree_iter iter; + struct bkey_s_c k; + int ret; + + bch2_trans_iter_init(trans, &iter, id, pos, + BTREE_ITER_NOT_EXTENTS| + BTREE_ITER_ALL_SNAPSHOTS); + while (1) { + k = bch2_btree_iter_prev(&iter); + ret = bkey_err(k); + if (ret) + break; + + if (!k.k) + break; + + if (!bkey_eq(pos, k.k->p)) + break; + + if (bch2_snapshot_is_ancestor(c, k.k->p.snapshot, pos.snapshot)) { + ret = 1; + break; + } + } + bch2_trans_iter_exit(trans, &iter); + + return ret; +} + +static inline int check_pos_snapshot_overwritten(struct btree_trans *trans, + enum btree_id id, + struct bpos pos) +{ + if (!btree_type_has_snapshots(id) || + bch2_snapshot_is_leaf(trans->c, pos.snapshot)) + return 0; + + return __check_pos_snapshot_overwritten(trans, id, pos); +} + +static noinline int extent_front_merge(struct btree_trans *trans, + struct btree_iter *iter, + struct bkey_s_c k, + struct bkey_i **insert, + enum btree_update_flags flags) +{ + struct bch_fs *c = trans->c; + struct bkey_i *update; + int ret; + + update = bch2_bkey_make_mut_noupdate(trans, k); + ret = PTR_ERR_OR_ZERO(update); + if (ret) + return ret; + + if (!bch2_bkey_merge(c, bkey_i_to_s(update), bkey_i_to_s_c(*insert))) + return 0; + + ret = check_pos_snapshot_overwritten(trans, iter->btree_id, k.k->p) ?: + check_pos_snapshot_overwritten(trans, iter->btree_id, (*insert)->k.p); + if (ret < 0) + return ret; + if (ret) + return 0; + + ret = bch2_btree_delete_at(trans, iter, flags); + if (ret) + return ret; + + *insert = update; + return 0; +} + +static noinline int extent_back_merge(struct btree_trans *trans, + struct btree_iter *iter, + struct bkey_i *insert, + struct bkey_s_c k) +{ + struct bch_fs *c = trans->c; + int ret; + + ret = check_pos_snapshot_overwritten(trans, iter->btree_id, insert->k.p) ?: + check_pos_snapshot_overwritten(trans, iter->btree_id, k.k->p); + if (ret < 0) + return ret; + if (ret) + return 0; + + bch2_bkey_merge(c, bkey_i_to_s(insert), k); + return 0; +} + +/* + * When deleting, check if we need to emit a whiteout (because we're overwriting + * something in an ancestor snapshot) + */ +static int need_whiteout_for_snapshot(struct btree_trans *trans, + enum btree_id btree_id, struct bpos pos) +{ + struct btree_iter iter; + struct bkey_s_c k; + u32 snapshot = pos.snapshot; + int ret; + + if (!bch2_snapshot_parent(trans->c, pos.snapshot)) + return 0; + + pos.snapshot++; + + for_each_btree_key_norestart(trans, iter, btree_id, pos, + BTREE_ITER_ALL_SNAPSHOTS| + BTREE_ITER_NOPRESERVE, k, ret) { + if (!bkey_eq(k.k->p, pos)) + break; + + if (bch2_snapshot_is_ancestor(trans->c, snapshot, + k.k->p.snapshot)) { + ret = !bkey_whiteout(k.k); + break; + } + } + bch2_trans_iter_exit(trans, &iter); + + return ret; +} + +int __bch2_insert_snapshot_whiteouts(struct btree_trans *trans, + enum btree_id id, + struct bpos old_pos, + struct bpos new_pos) +{ + struct bch_fs *c = trans->c; + struct btree_iter old_iter, new_iter = { NULL }; + struct bkey_s_c old_k, new_k; + snapshot_id_list s; + struct bkey_i *update; + int ret; + + if (!bch2_snapshot_has_children(c, old_pos.snapshot)) + return 0; + + darray_init(&s); + + bch2_trans_iter_init(trans, &old_iter, id, old_pos, + BTREE_ITER_NOT_EXTENTS| + BTREE_ITER_ALL_SNAPSHOTS); + while ((old_k = bch2_btree_iter_prev(&old_iter)).k && + !(ret = bkey_err(old_k)) && + bkey_eq(old_pos, old_k.k->p)) { + struct bpos whiteout_pos = + SPOS(new_pos.inode, new_pos.offset, old_k.k->p.snapshot);; + + if (!bch2_snapshot_is_ancestor(c, old_k.k->p.snapshot, old_pos.snapshot) || + snapshot_list_has_ancestor(c, &s, old_k.k->p.snapshot)) + continue; + + new_k = bch2_bkey_get_iter(trans, &new_iter, id, whiteout_pos, + BTREE_ITER_NOT_EXTENTS| + BTREE_ITER_INTENT); + ret = bkey_err(new_k); + if (ret) + break; + + if (new_k.k->type == KEY_TYPE_deleted) { + update = bch2_trans_kmalloc(trans, sizeof(struct bkey_i)); + ret = PTR_ERR_OR_ZERO(update); + if (ret) + break; + + bkey_init(&update->k); + update->k.p = whiteout_pos; + update->k.type = KEY_TYPE_whiteout; + + ret = bch2_trans_update(trans, &new_iter, update, + BTREE_UPDATE_INTERNAL_SNAPSHOT_NODE); + } + bch2_trans_iter_exit(trans, &new_iter); + + ret = snapshot_list_add(c, &s, old_k.k->p.snapshot); + if (ret) + break; + } + bch2_trans_iter_exit(trans, &new_iter); + bch2_trans_iter_exit(trans, &old_iter); + darray_exit(&s); + + return ret; +} + +int bch2_trans_update_extent_overwrite(struct btree_trans *trans, + struct btree_iter *iter, + enum btree_update_flags flags, + struct bkey_s_c old, + struct bkey_s_c new) +{ + enum btree_id btree_id = iter->btree_id; + struct bkey_i *update; + struct bpos new_start = bkey_start_pos(new.k); + bool front_split = bkey_lt(bkey_start_pos(old.k), new_start); + bool back_split = bkey_gt(old.k->p, new.k->p); + int ret = 0, compressed_sectors; + + /* + * If we're going to be splitting a compressed extent, note it + * so that __bch2_trans_commit() can increase our disk + * reservation: + */ + if (((front_split && back_split) || + ((front_split || back_split) && old.k->p.snapshot != new.k->p.snapshot)) && + (compressed_sectors = bch2_bkey_sectors_compressed(old))) + trans->extra_journal_res += compressed_sectors; + + if (front_split) { + update = bch2_bkey_make_mut_noupdate(trans, old); + if ((ret = PTR_ERR_OR_ZERO(update))) + return ret; + + bch2_cut_back(new_start, update); + + ret = bch2_insert_snapshot_whiteouts(trans, btree_id, + old.k->p, update->k.p) ?: + bch2_btree_insert_nonextent(trans, btree_id, update, + BTREE_UPDATE_INTERNAL_SNAPSHOT_NODE|flags); + if (ret) + return ret; + } + + /* If we're overwriting in a different snapshot - middle split: */ + if (old.k->p.snapshot != new.k->p.snapshot && + (front_split || back_split)) { + update = bch2_bkey_make_mut_noupdate(trans, old); + if ((ret = PTR_ERR_OR_ZERO(update))) + return ret; + + bch2_cut_front(new_start, update); + bch2_cut_back(new.k->p, update); + + ret = bch2_insert_snapshot_whiteouts(trans, btree_id, + old.k->p, update->k.p) ?: + bch2_btree_insert_nonextent(trans, btree_id, update, + BTREE_UPDATE_INTERNAL_SNAPSHOT_NODE|flags); + if (ret) + return ret; + } + + if (bkey_le(old.k->p, new.k->p)) { + update = bch2_trans_kmalloc(trans, sizeof(*update)); + if ((ret = PTR_ERR_OR_ZERO(update))) + return ret; + + bkey_init(&update->k); + update->k.p = old.k->p; + update->k.p.snapshot = new.k->p.snapshot; + + if (new.k->p.snapshot != old.k->p.snapshot) { + update->k.type = KEY_TYPE_whiteout; + } else if (btree_type_has_snapshots(btree_id)) { + ret = need_whiteout_for_snapshot(trans, btree_id, update->k.p); + if (ret < 0) + return ret; + if (ret) + update->k.type = KEY_TYPE_whiteout; + } + + ret = bch2_btree_insert_nonextent(trans, btree_id, update, + BTREE_UPDATE_INTERNAL_SNAPSHOT_NODE|flags); + if (ret) + return ret; + } + + if (back_split) { + update = bch2_bkey_make_mut_noupdate(trans, old); + if ((ret = PTR_ERR_OR_ZERO(update))) + return ret; + + bch2_cut_front(new.k->p, update); + + ret = bch2_trans_update_by_path(trans, iter->path, update, + BTREE_UPDATE_INTERNAL_SNAPSHOT_NODE| + flags, _RET_IP_); + if (ret) + return ret; + } + + return 0; +} + +static int bch2_trans_update_extent(struct btree_trans *trans, + struct btree_iter *orig_iter, + struct bkey_i *insert, + enum btree_update_flags flags) +{ + struct btree_iter iter; + struct bkey_s_c k; + enum btree_id btree_id = orig_iter->btree_id; + int ret = 0; + + bch2_trans_iter_init(trans, &iter, btree_id, bkey_start_pos(&insert->k), + BTREE_ITER_INTENT| + BTREE_ITER_WITH_UPDATES| + BTREE_ITER_NOT_EXTENTS); + k = bch2_btree_iter_peek_upto(&iter, POS(insert->k.p.inode, U64_MAX)); + if ((ret = bkey_err(k))) + goto err; + if (!k.k) + goto out; + + if (bkey_eq(k.k->p, bkey_start_pos(&insert->k))) { + if (bch2_bkey_maybe_mergable(k.k, &insert->k)) { + ret = extent_front_merge(trans, &iter, k, &insert, flags); + if (ret) + goto err; + } + + goto next; + } + + while (bkey_gt(insert->k.p, bkey_start_pos(k.k))) { + bool done = bkey_lt(insert->k.p, k.k->p); + + ret = bch2_trans_update_extent_overwrite(trans, &iter, flags, k, bkey_i_to_s_c(insert)); + if (ret) + goto err; + + if (done) + goto out; +next: + bch2_btree_iter_advance(&iter); + k = bch2_btree_iter_peek_upto(&iter, POS(insert->k.p.inode, U64_MAX)); + if ((ret = bkey_err(k))) + goto err; + if (!k.k) + goto out; + } + + if (bch2_bkey_maybe_mergable(&insert->k, k.k)) { + ret = extent_back_merge(trans, &iter, insert, k); + if (ret) + goto err; + } +out: + if (!bkey_deleted(&insert->k)) + ret = bch2_btree_insert_nonextent(trans, btree_id, insert, flags); +err: + bch2_trans_iter_exit(trans, &iter); + + return ret; +} + +static noinline int flush_new_cached_update(struct btree_trans *trans, + struct btree_path *path, + struct btree_insert_entry *i, + enum btree_update_flags flags, + unsigned long ip) +{ + struct btree_path *btree_path; + struct bkey k; + int ret; + + btree_path = bch2_path_get(trans, path->btree_id, path->pos, 1, 0, + BTREE_ITER_INTENT, _THIS_IP_); + ret = bch2_btree_path_traverse(trans, btree_path, 0); + if (ret) + goto out; + + /* + * The old key in the insert entry might actually refer to an existing + * key in the btree that has been deleted from cache and not yet + * flushed. Check for this and skip the flush so we don't run triggers + * against a stale key. + */ + bch2_btree_path_peek_slot_exact(btree_path, &k); + if (!bkey_deleted(&k)) + goto out; + + i->key_cache_already_flushed = true; + i->flags |= BTREE_TRIGGER_NORUN; + + btree_path_set_should_be_locked(btree_path); + ret = bch2_trans_update_by_path(trans, btree_path, i->k, flags, ip); +out: + bch2_path_put(trans, btree_path, true); + return ret; +} + +static int __must_check +bch2_trans_update_by_path(struct btree_trans *trans, struct btree_path *path, + struct bkey_i *k, enum btree_update_flags flags, + unsigned long ip) +{ + struct bch_fs *c = trans->c; + struct btree_insert_entry *i, n; + u64 seq = 0; + int cmp; + + EBUG_ON(!path->should_be_locked); + EBUG_ON(trans->nr_updates >= BTREE_ITER_MAX); + EBUG_ON(!bpos_eq(k->k.p, path->pos)); + + /* + * The transaction journal res hasn't been allocated at this point. + * That occurs at commit time. Reuse the seq field to pass in the seq + * of a prejournaled key. + */ + if (flags & BTREE_UPDATE_PREJOURNAL) + seq = trans->journal_res.seq; + + n = (struct btree_insert_entry) { + .flags = flags, + .bkey_type = __btree_node_type(path->level, path->btree_id), + .btree_id = path->btree_id, + .level = path->level, + .cached = path->cached, + .path = path, + .k = k, + .seq = seq, + .ip_allocated = ip, + }; + +#ifdef CONFIG_BCACHEFS_DEBUG + trans_for_each_update(trans, i) + BUG_ON(i != trans->updates && + btree_insert_entry_cmp(i - 1, i) >= 0); +#endif + + /* + * Pending updates are kept sorted: first, find position of new update, + * then delete/trim any updates the new update overwrites: + */ + trans_for_each_update(trans, i) { + cmp = btree_insert_entry_cmp(&n, i); + if (cmp <= 0) + break; + } + + if (!cmp && i < trans->updates + trans->nr_updates) { + EBUG_ON(i->insert_trigger_run || i->overwrite_trigger_run); + + bch2_path_put(trans, i->path, true); + i->flags = n.flags; + i->cached = n.cached; + i->k = n.k; + i->path = n.path; + i->seq = n.seq; + i->ip_allocated = n.ip_allocated; + } else { + array_insert_item(trans->updates, trans->nr_updates, + i - trans->updates, n); + + i->old_v = bch2_btree_path_peek_slot_exact(path, &i->old_k).v; + i->old_btree_u64s = !bkey_deleted(&i->old_k) ? i->old_k.u64s : 0; + + if (unlikely(trans->journal_replay_not_finished)) { + struct bkey_i *j_k = + bch2_journal_keys_peek_slot(c, n.btree_id, n.level, k->k.p); + + if (j_k) { + i->old_k = j_k->k; + i->old_v = &j_k->v; + } + } + } + + __btree_path_get(i->path, true); + + /* + * If a key is present in the key cache, it must also exist in the + * btree - this is necessary for cache coherency. When iterating over + * a btree that's cached in the key cache, the btree iter code checks + * the key cache - but the key has to exist in the btree for that to + * work: + */ + if (path->cached && bkey_deleted(&i->old_k)) + return flush_new_cached_update(trans, path, i, flags, ip); + + return 0; +} + +int __must_check bch2_trans_update(struct btree_trans *trans, struct btree_iter *iter, + struct bkey_i *k, enum btree_update_flags flags) +{ + struct btree_path *path = iter->update_path ?: iter->path; + struct bkey_cached *ck; + int ret; + + if (iter->flags & BTREE_ITER_IS_EXTENTS) + return bch2_trans_update_extent(trans, iter, k, flags); + + if (bkey_deleted(&k->k) && + !(flags & BTREE_UPDATE_KEY_CACHE_RECLAIM) && + (iter->flags & BTREE_ITER_FILTER_SNAPSHOTS)) { + ret = need_whiteout_for_snapshot(trans, iter->btree_id, k->k.p); + if (unlikely(ret < 0)) + return ret; + + if (ret) + k->k.type = KEY_TYPE_whiteout; + } + + /* + * Ensure that updates to cached btrees go to the key cache: + */ + if (!(flags & BTREE_UPDATE_KEY_CACHE_RECLAIM) && + !path->cached && + !path->level && + btree_id_cached(trans->c, path->btree_id)) { + if (!iter->key_cache_path || + !iter->key_cache_path->should_be_locked || + !bpos_eq(iter->key_cache_path->pos, k->k.p)) { + if (!iter->key_cache_path) + iter->key_cache_path = + bch2_path_get(trans, path->btree_id, path->pos, 1, 0, + BTREE_ITER_INTENT| + BTREE_ITER_CACHED, _THIS_IP_); + + iter->key_cache_path = + bch2_btree_path_set_pos(trans, iter->key_cache_path, path->pos, + iter->flags & BTREE_ITER_INTENT, + _THIS_IP_); + + ret = bch2_btree_path_traverse(trans, iter->key_cache_path, + BTREE_ITER_CACHED); + if (unlikely(ret)) + return ret; + + ck = (void *) iter->key_cache_path->l[0].b; + + if (test_bit(BKEY_CACHED_DIRTY, &ck->flags)) { + trace_and_count(trans->c, trans_restart_key_cache_raced, trans, _RET_IP_); + return btree_trans_restart(trans, BCH_ERR_transaction_restart_key_cache_raced); + } + + btree_path_set_should_be_locked(iter->key_cache_path); + } + + path = iter->key_cache_path; + } + + return bch2_trans_update_by_path(trans, path, k, flags, _RET_IP_); +} + +/* + * Add a transaction update for a key that has already been journaled. + */ +int __must_check bch2_trans_update_seq(struct btree_trans *trans, u64 seq, + struct btree_iter *iter, struct bkey_i *k, + enum btree_update_flags flags) +{ + trans->journal_res.seq = seq; + return bch2_trans_update(trans, iter, k, flags|BTREE_UPDATE_NOJOURNAL| + BTREE_UPDATE_PREJOURNAL); +} + +int __must_check bch2_trans_update_buffered(struct btree_trans *trans, + enum btree_id btree, + struct bkey_i *k) +{ + struct btree_write_buffered_key *i; + int ret; + + EBUG_ON(trans->nr_wb_updates > trans->wb_updates_size); + EBUG_ON(k->k.u64s > BTREE_WRITE_BUFERED_U64s_MAX); + + trans_for_each_wb_update(trans, i) { + if (i->btree == btree && bpos_eq(i->k.k.p, k->k.p)) { + bkey_copy(&i->k, k); + return 0; + } + } + + if (!trans->wb_updates || + trans->nr_wb_updates == trans->wb_updates_size) { + struct btree_write_buffered_key *u; + + if (trans->nr_wb_updates == trans->wb_updates_size) { + struct btree_transaction_stats *s = btree_trans_stats(trans); + + BUG_ON(trans->wb_updates_size > U8_MAX / 2); + trans->wb_updates_size = max(1, trans->wb_updates_size * 2); + if (s) + s->wb_updates_size = trans->wb_updates_size; + } + + u = bch2_trans_kmalloc_nomemzero(trans, + trans->wb_updates_size * + sizeof(struct btree_write_buffered_key)); + ret = PTR_ERR_OR_ZERO(u); + if (ret) + return ret; + + if (trans->nr_wb_updates) + memcpy(u, trans->wb_updates, trans->nr_wb_updates * + sizeof(struct btree_write_buffered_key)); + trans->wb_updates = u; + } + + trans->wb_updates[trans->nr_wb_updates] = (struct btree_write_buffered_key) { + .btree = btree, + }; + + bkey_copy(&trans->wb_updates[trans->nr_wb_updates].k, k); + trans->nr_wb_updates++; + + return 0; +} + +int bch2_bkey_get_empty_slot(struct btree_trans *trans, struct btree_iter *iter, + enum btree_id btree, struct bpos end) +{ + struct bkey_s_c k; + int ret = 0; + + bch2_trans_iter_init(trans, iter, btree, POS_MAX, BTREE_ITER_INTENT); + k = bch2_btree_iter_prev(iter); + ret = bkey_err(k); + if (ret) + goto err; + + bch2_btree_iter_advance(iter); + k = bch2_btree_iter_peek_slot(iter); + ret = bkey_err(k); + if (ret) + goto err; + + BUG_ON(k.k->type != KEY_TYPE_deleted); + + if (bkey_gt(k.k->p, end)) { + ret = -BCH_ERR_ENOSPC_btree_slot; + goto err; + } + + return 0; +err: + bch2_trans_iter_exit(trans, iter); + return ret; +} + +void bch2_trans_commit_hook(struct btree_trans *trans, + struct btree_trans_commit_hook *h) +{ + h->next = trans->hooks; + trans->hooks = h; +} + +int bch2_btree_insert_nonextent(struct btree_trans *trans, + enum btree_id btree, struct bkey_i *k, + enum btree_update_flags flags) +{ + struct btree_iter iter; + int ret; + + bch2_trans_iter_init(trans, &iter, btree, k->k.p, + BTREE_ITER_NOT_EXTENTS| + BTREE_ITER_INTENT); + ret = bch2_btree_iter_traverse(&iter) ?: + bch2_trans_update(trans, &iter, k, flags); + bch2_trans_iter_exit(trans, &iter); + return ret; +} + +int __bch2_btree_insert(struct btree_trans *trans, enum btree_id id, + struct bkey_i *k, enum btree_update_flags flags) +{ + struct btree_iter iter; + int ret; + + bch2_trans_iter_init(trans, &iter, id, bkey_start_pos(&k->k), + BTREE_ITER_CACHED| + BTREE_ITER_INTENT); + ret = bch2_btree_iter_traverse(&iter) ?: + bch2_trans_update(trans, &iter, k, flags); + bch2_trans_iter_exit(trans, &iter); + return ret; +} + +/** + * bch2_btree_insert - insert keys into the extent btree + * @c: pointer to struct bch_fs + * @id: btree to insert into + * @insert_keys: list of keys to insert + * @hook: insert callback + */ +int bch2_btree_insert(struct bch_fs *c, enum btree_id id, + struct bkey_i *k, + struct disk_reservation *disk_res, + u64 *journal_seq, int flags) +{ + return bch2_trans_do(c, disk_res, journal_seq, flags, + __bch2_btree_insert(&trans, id, k, 0)); +} + +int bch2_btree_delete_extent_at(struct btree_trans *trans, struct btree_iter *iter, + unsigned len, unsigned update_flags) +{ + struct bkey_i *k; + + k = bch2_trans_kmalloc(trans, sizeof(*k)); + if (IS_ERR(k)) + return PTR_ERR(k); + + bkey_init(&k->k); + k->k.p = iter->pos; + bch2_key_resize(&k->k, len); + return bch2_trans_update(trans, iter, k, update_flags); +} + +int bch2_btree_delete_at(struct btree_trans *trans, + struct btree_iter *iter, unsigned update_flags) +{ + return bch2_btree_delete_extent_at(trans, iter, 0, update_flags); +} + +int bch2_btree_delete_at_buffered(struct btree_trans *trans, + enum btree_id btree, struct bpos pos) +{ + struct bkey_i *k; + + k = bch2_trans_kmalloc(trans, sizeof(*k)); + if (IS_ERR(k)) + return PTR_ERR(k); + + bkey_init(&k->k); + k->k.p = pos; + return bch2_trans_update_buffered(trans, btree, k); +} + +int bch2_btree_delete_range_trans(struct btree_trans *trans, enum btree_id id, + struct bpos start, struct bpos end, + unsigned update_flags, + u64 *journal_seq) +{ + u32 restart_count = trans->restart_count; + struct btree_iter iter; + struct bkey_s_c k; + int ret = 0; + + bch2_trans_iter_init(trans, &iter, id, start, BTREE_ITER_INTENT); + while ((k = bch2_btree_iter_peek_upto(&iter, end)).k) { + struct disk_reservation disk_res = + bch2_disk_reservation_init(trans->c, 0); + struct bkey_i delete; + + ret = bkey_err(k); + if (ret) + goto err; + + bkey_init(&delete.k); + + /* + * This could probably be more efficient for extents: + */ + + /* + * For extents, iter.pos won't necessarily be the same as + * bkey_start_pos(k.k) (for non extents they always will be the + * same). It's important that we delete starting from iter.pos + * because the range we want to delete could start in the middle + * of k. + * + * (bch2_btree_iter_peek() does guarantee that iter.pos >= + * bkey_start_pos(k.k)). + */ + delete.k.p = iter.pos; + + if (iter.flags & BTREE_ITER_IS_EXTENTS) + bch2_key_resize(&delete.k, + bpos_min(end, k.k->p).offset - + iter.pos.offset); + + ret = bch2_trans_update(trans, &iter, &delete, update_flags) ?: + bch2_trans_commit(trans, &disk_res, journal_seq, + BTREE_INSERT_NOFAIL); + bch2_disk_reservation_put(trans->c, &disk_res); +err: + /* + * the bch2_trans_begin() call is in a weird place because we + * need to call it after every transaction commit, to avoid path + * overflow, but don't want to call it if the delete operation + * is a no-op and we have no work to do: + */ + bch2_trans_begin(trans); + + if (bch2_err_matches(ret, BCH_ERR_transaction_restart)) + ret = 0; + if (ret) + break; + } + bch2_trans_iter_exit(trans, &iter); + + if (!ret && trans_was_restarted(trans, restart_count)) + ret = -BCH_ERR_transaction_restart_nested; + return ret; +} + +/* + * bch_btree_delete_range - delete everything within a given range + * + * Range is a half open interval - [start, end) + */ +int bch2_btree_delete_range(struct bch_fs *c, enum btree_id id, + struct bpos start, struct bpos end, + unsigned update_flags, + u64 *journal_seq) +{ + int ret = bch2_trans_run(c, + bch2_btree_delete_range_trans(&trans, id, start, end, + update_flags, journal_seq)); + if (ret == -BCH_ERR_transaction_restart_nested) + ret = 0; + return ret; +} + +int bch2_btree_bit_mod(struct btree_trans *trans, enum btree_id btree, + struct bpos pos, bool set) +{ + struct bkey_i *k; + int ret = 0; + + k = bch2_trans_kmalloc_nomemzero(trans, sizeof(*k)); + ret = PTR_ERR_OR_ZERO(k); + if (unlikely(ret)) + return ret; + + bkey_init(&k->k); + k->k.type = set ? KEY_TYPE_set : KEY_TYPE_deleted; + k->k.p = pos; + + return bch2_trans_update_buffered(trans, btree, k); +} + +static int __bch2_trans_log_msg(darray_u64 *entries, const char *fmt, va_list args) +{ + struct printbuf buf = PRINTBUF; + struct jset_entry_log *l; + unsigned u64s; + int ret; + + prt_vprintf(&buf, fmt, args); + ret = buf.allocation_failure ? -BCH_ERR_ENOMEM_trans_log_msg : 0; + if (ret) + goto err; + + u64s = DIV_ROUND_UP(buf.pos, sizeof(u64)); + + ret = darray_make_room(entries, jset_u64s(u64s)); + if (ret) + goto err; + + l = (void *) &darray_top(*entries); + l->entry.u64s = cpu_to_le16(u64s); + l->entry.btree_id = 0; + l->entry.level = 1; + l->entry.type = BCH_JSET_ENTRY_log; + l->entry.pad[0] = 0; + l->entry.pad[1] = 0; + l->entry.pad[2] = 0; + memcpy(l->d, buf.buf, buf.pos); + while (buf.pos & 7) + l->d[buf.pos++] = '\0'; + + entries->nr += jset_u64s(u64s); +err: + printbuf_exit(&buf); + return ret; +} + +static int +__bch2_fs_log_msg(struct bch_fs *c, unsigned commit_flags, const char *fmt, + va_list args) +{ + int ret; + + if (!test_bit(JOURNAL_STARTED, &c->journal.flags)) { + ret = __bch2_trans_log_msg(&c->journal.early_journal_entries, fmt, args); + } else { + ret = bch2_trans_do(c, NULL, NULL, + BTREE_INSERT_LAZY_RW|commit_flags, + __bch2_trans_log_msg(&trans.extra_journal_entries, fmt, args)); + } + + return ret; +} + +int bch2_fs_log_msg(struct bch_fs *c, const char *fmt, ...) +{ + va_list args; + int ret; + + va_start(args, fmt); + ret = __bch2_fs_log_msg(c, 0, fmt, args); + va_end(args); + return ret; +} + +/* + * Use for logging messages during recovery to enable reserved space and avoid + * blocking. + */ +int bch2_journal_log_msg(struct bch_fs *c, const char *fmt, ...) +{ + va_list args; + int ret; + + va_start(args, fmt); + ret = __bch2_fs_log_msg(c, BCH_WATERMARK_reclaim, fmt, args); + va_end(args); + return ret; +} |