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bcachefs: Kill gc_init_recurse()
This unifies the online and offline btree gc passes; we're not yet running it online. We now iterate over one level of the btree at a time - the same as check_extents_to_backpointers(); this ordering preserves order of keys regardless of btree splits and merges, which will be important when we re-enable online gc. Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet
parent
c451986bf4
commit
24b27975a9
@ -519,8 +519,8 @@ enum gc_phase {
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struct gc_pos {
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enum gc_phase phase;
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u16 level;
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struct bpos pos;
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unsigned level;
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};
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struct reflink_gc {
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@ -63,7 +63,7 @@ static inline void __gc_pos_set(struct bch_fs *c, struct gc_pos new_pos)
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static inline void gc_pos_set(struct bch_fs *c, struct gc_pos new_pos)
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{
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BUG_ON(gc_pos_cmp(new_pos, c->gc_pos) <= 0);
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BUG_ON(gc_pos_cmp(new_pos, c->gc_pos) < 0);
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__gc_pos_set(c, new_pos);
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}
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@ -554,11 +554,24 @@ fsck_err:
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/* marking of btree keys/nodes: */
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static int bch2_gc_mark_key(struct btree_trans *trans, enum btree_id btree_id,
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unsigned level, bool is_root,
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struct bkey_s_c k,
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unsigned level, struct btree **prev,
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struct btree_iter *iter, struct bkey_s_c k,
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bool initial)
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{
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struct bch_fs *c = trans->c;
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if (iter) {
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struct btree_path *path = btree_iter_path(trans, iter);
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struct btree *b = path_l(path)->b;
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if (*prev != b) {
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int ret = bch2_btree_node_check_topology(trans, b);
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if (ret)
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return ret;
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}
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*prev = b;
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}
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struct bkey deleted = KEY(0, 0, 0);
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struct bkey_s_c old = (struct bkey_s_c) { &deleted, NULL };
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struct printbuf buf = PRINTBUF;
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@ -594,7 +607,7 @@ static int bch2_gc_mark_key(struct btree_trans *trans, enum btree_id btree_id,
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* key_trigger(BTREE_TRIGGER_GC) is not idempotant; we'll calculate the
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* wrong result if we run it multiple times.
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*/
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unsigned flags = is_root ? BTREE_TRIGGER_is_root : 0;
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unsigned flags = !iter ? BTREE_TRIGGER_is_root : 0;
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ret = bch2_key_trigger(trans, btree_id, level, old, unsafe_bkey_s_c_to_s(k),
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BTREE_TRIGGER_check_repair|flags);
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@ -616,151 +629,55 @@ fsck_err:
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return ret;
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}
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static int btree_gc_mark_node(struct btree_trans *trans, struct btree *b, bool initial)
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{
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struct btree_and_journal_iter iter;
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struct bkey_s_c k;
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int ret = 0;
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ret = bch2_btree_node_check_topology(trans, b);
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if (ret)
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return ret;
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bch2_btree_and_journal_iter_init_node_iter(trans, &iter, b);
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while ((k = bch2_btree_and_journal_iter_peek(&iter)).k) {
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bch2_trans_begin(trans);
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ret = bch2_gc_mark_key(trans, b->c.btree_id, b->c.level, false, k, initial);
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if (bch2_err_matches(ret, BCH_ERR_transaction_restart)) {
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ret = 0;
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continue;
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}
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if (ret)
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break;
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bch2_btree_and_journal_iter_advance(&iter);
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}
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bch2_btree_and_journal_iter_exit(&iter);
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return ret;
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}
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static int bch2_gc_btree(struct btree_trans *trans, enum btree_id btree_id,
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bool initial)
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static int bch2_gc_btree(struct btree_trans *trans, enum btree_id btree, bool initial)
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{
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struct bch_fs *c = trans->c;
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struct btree_iter iter;
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struct btree *b;
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unsigned target_depth = btree_type_has_ptrs(btree_id) ? 0 : 1;
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int level = 0, target_depth = btree_node_type_needs_gc(__btree_node_type(0, btree)) ? 0 : 1;
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int ret = 0;
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gc_pos_set(c, gc_pos_btree(btree_id, POS_MIN, 0));
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__for_each_btree_node(trans, iter, btree_id, POS_MIN,
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0, target_depth, BTREE_ITER_prefetch, b, ret) {
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bch2_verify_btree_nr_keys(b);
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gc_pos_set(c, gc_pos_btree_node(b));
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ret = btree_gc_mark_node(trans, b, initial);
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if (ret)
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break;
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}
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bch2_trans_iter_exit(trans, &iter);
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if (ret)
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return ret;
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/* We need to make sure every leaf node is readable before going RW */
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if (initial)
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target_depth = 0;
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/* root */
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mutex_lock(&c->btree_root_lock);
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b = bch2_btree_id_root(c, btree_id)->b;
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if (!btree_node_fake(b))
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struct btree *b = bch2_btree_id_root(c, btree)->b;
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if (!btree_node_fake(b)) {
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gc_pos_set(c, gc_pos_btree(btree, b->c.level + 1, SPOS_MAX));
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ret = lockrestart_do(trans,
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bch2_gc_mark_key(trans, b->c.btree_id, b->c.level + 1,
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true, bkey_i_to_s_c(&b->key), initial));
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gc_pos_set(c, gc_pos_btree_root(b->c.btree_id));
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NULL, NULL, bkey_i_to_s_c(&b->key), initial));
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level = b->c.level;
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}
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mutex_unlock(&c->btree_root_lock);
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return ret;
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}
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static int bch2_gc_btree_init_recurse(struct btree_trans *trans, struct btree *b,
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unsigned target_depth)
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{
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int ret = btree_gc_mark_node(trans, b, true);
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if (ret)
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return ret;
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if (b->c.level > target_depth) {
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struct bch_fs *c = trans->c;
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struct btree_and_journal_iter iter;
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struct bkey_s_c k;
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struct bkey_buf cur;
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for (; level >= target_depth; --level) {
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struct btree *prev = NULL;
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struct btree_iter iter;
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bch2_trans_node_iter_init(trans, &iter, btree, POS_MIN, 0, level,
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BTREE_ITER_prefetch);
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bch2_bkey_buf_init(&cur);
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bch2_btree_and_journal_iter_init_node_iter(trans, &iter, b);
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iter.prefetch = true;
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while ((k = bch2_btree_and_journal_iter_peek(&iter)).k) {
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bch2_bkey_buf_reassemble(&cur, c, k);
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bch2_btree_and_journal_iter_advance(&iter);
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struct btree *child =
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bch2_btree_node_get_noiter(trans, cur.k,
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b->c.btree_id, b->c.level - 1,
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false);
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ret = PTR_ERR_OR_ZERO(child);
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bch_err_msg(c, ret, "getting btree node");
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if (ret)
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break;
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ret = bch2_gc_btree_init_recurse(trans, child, target_depth);
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six_unlock_read(&child->c.lock);
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if (ret)
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break;
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}
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bch2_bkey_buf_exit(&cur, c);
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bch2_btree_and_journal_iter_exit(&iter);
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ret = for_each_btree_key_continue(trans, iter, 0, k, ({
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gc_pos_set(c, gc_pos_btree(btree, level, k.k->p));
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bch2_gc_mark_key(trans, btree, level, &prev, &iter, k, initial);
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}));
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if (ret)
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break;
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}
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return ret;
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}
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static int bch2_gc_btree_init(struct btree_trans *trans,
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enum btree_id btree_id)
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{
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struct bch_fs *c = trans->c;
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/*
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* We need to make sure every leaf node is readable before going RW
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unsigned target_depth = btree_node_type_needs_gc(__btree_node_type(0, btree_id)) ? 0 : 1;
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*/
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unsigned target_depth = 0;
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int ret = 0;
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struct btree *b = bch2_btree_id_root(c, btree_id)->b;
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six_lock_read(&b->c.lock, NULL, NULL);
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if (b->c.level >= target_depth)
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ret = bch2_gc_btree_init_recurse(trans, b, target_depth);
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if (!ret)
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ret = lockrestart_do(trans,
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bch2_gc_mark_key(trans, b->c.btree_id, b->c.level + 1, true,
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bkey_i_to_s_c(&b->key), true));
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six_unlock_read(&b->c.lock);
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bch_err_fn(c, ret);
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return ret;
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}
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static inline int btree_id_gc_phase_cmp(enum btree_id l, enum btree_id r)
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{
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return (int) btree_id_to_gc_phase(l) -
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(int) btree_id_to_gc_phase(r);
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}
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static int bch2_gc_btrees(struct bch_fs *c, bool initial)
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static int bch2_gc_btrees(struct bch_fs *c)
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{
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struct btree_trans *trans = bch2_trans_get(c);
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enum btree_id ids[BTREE_ID_NR];
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@ -777,9 +694,7 @@ static int bch2_gc_btrees(struct bch_fs *c, bool initial)
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if (IS_ERR_OR_NULL(bch2_btree_id_root(c, btree)->b))
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continue;
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ret = initial
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? bch2_gc_btree_init(trans, btree)
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: bch2_gc_btree(trans, btree, initial);
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ret = bch2_gc_btree(trans, btree, true);
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if (mustfix_fsck_err_on(bch2_err_matches(ret, EIO),
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c, btree_node_read_error,
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@ -1261,10 +1176,9 @@ static int bch2_gc_stripes_done(struct bch_fs *c)
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}
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/**
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* bch2_gc - walk _all_ references to buckets, and recompute them:
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* bch2_check_allocations - walk all references to buckets, and recompute them:
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*
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* @c: filesystem object
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* @initial: are we in recovery?
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*
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* Returns: 0 on success, or standard errcode on failure
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*
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@ -1283,7 +1197,7 @@ static int bch2_gc_stripes_done(struct bch_fs *c)
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* move around - if references move backwards in the ordering GC
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* uses, GC could skip past them
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*/
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static int bch2_gc(struct bch_fs *c, bool initial)
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int bch2_check_allocations(struct bch_fs *c)
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{
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int ret;
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@ -1304,7 +1218,7 @@ static int bch2_gc(struct bch_fs *c, bool initial)
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ret = bch2_mark_superblocks(c);
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BUG_ON(ret);
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ret = bch2_gc_btrees(c, initial);
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ret = bch2_gc_btrees(c);
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if (ret)
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goto out;
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@ -1337,11 +1251,6 @@ out:
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return ret;
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}
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int bch2_check_allocations(struct bch_fs *c)
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{
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return bch2_gc(c, true);
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}
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static int gc_btree_gens_key(struct btree_trans *trans,
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struct btree_iter *iter,
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struct bkey_s_c k)
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@ -34,16 +34,16 @@ static inline struct gc_pos gc_phase(enum gc_phase phase)
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{
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return (struct gc_pos) {
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.phase = phase,
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.pos = POS_MIN,
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.level = 0,
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.pos = POS_MIN,
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};
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}
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static inline int gc_pos_cmp(struct gc_pos l, struct gc_pos r)
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{
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return cmp_int(l.phase, r.phase) ?:
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bpos_cmp(l.pos, r.pos) ?:
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cmp_int(l.level, r.level);
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return cmp_int(l.phase, r.phase) ?:
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-cmp_int(l.level, r.level) ?:
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bpos_cmp(l.pos, r.pos);
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}
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static inline enum gc_phase btree_id_to_gc_phase(enum btree_id id)
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@ -57,13 +57,13 @@ static inline enum gc_phase btree_id_to_gc_phase(enum btree_id id)
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}
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}
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static inline struct gc_pos gc_pos_btree(enum btree_id id,
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struct bpos pos, unsigned level)
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static inline struct gc_pos gc_pos_btree(enum btree_id btree, unsigned level,
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struct bpos pos)
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{
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return (struct gc_pos) {
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.phase = btree_id_to_gc_phase(id),
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.pos = pos,
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.phase = btree_id_to_gc_phase(btree),
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.level = level,
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.pos = pos,
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};
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}
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@ -73,19 +73,7 @@ static inline struct gc_pos gc_pos_btree(enum btree_id id,
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*/
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static inline struct gc_pos gc_pos_btree_node(struct btree *b)
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{
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return gc_pos_btree(b->c.btree_id, b->key.k.p, b->c.level);
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}
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/*
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* GC position of the pointer to a btree root: we don't use
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* gc_pos_pointer_to_btree_node() here to avoid a potential race with
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* btree_split() increasing the tree depth - the new root will have level > the
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* old root and thus have a greater gc position than the old root, but that
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* would be incorrect since once gc has marked the root it's not coming back.
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*/
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static inline struct gc_pos gc_pos_btree_root(enum btree_id id)
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{
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return gc_pos_btree(id, SPOS_MAX, BTREE_MAX_DEPTH);
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return gc_pos_btree(b->c.btree_id, b->c.level, b->key.k.p);
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}
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static inline bool gc_visited(struct bch_fs *c, struct gc_pos pos)
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