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bcachefs: Fix bch2_trans_put()

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reference: https://github.com/koverstreet/bcachefs/issues/692

trans->ref is the reference used by the cycle detector, which walks
btree_trans objects of other threads to walk the graph of held locks and
issue wakeups when an abort is required.

We have to wait for the ref to go to 1 before freeing trans->paths or
clearing trans->locking_wait.task.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2024-06-19 15:47:44 -04:00
parent 0a2a507d40
commit a56da69799
1 changed files with 8 additions and 3 deletions
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11
fs/bcachefs/btree_iter.c
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@ -3161,6 +3161,7 @@ struct btree_trans *__bch2_trans_get(struct bch_fs *c, unsigned fn_idx)
list_add_done:
seqmutex_unlock(&c->btree_trans_lock);
got_trans:
trans->ref.closure_get_happened = false;
trans->c = c;
trans->last_begin_time = local_clock();
trans->fn_idx = fn_idx;
@ -3235,7 +3236,6 @@ void bch2_trans_put(struct btree_trans *trans)
trans_for_each_update(trans, i)
__btree_path_put(trans->paths + i->path, true);
trans->nr_updates = 0;
trans->locking_wait.task = NULL;
check_btree_paths_leaked(trans);
@ -3256,6 +3256,13 @@ void bch2_trans_put(struct btree_trans *trans)
if (unlikely(trans->journal_replay_not_finished))
bch2_journal_keys_put(c);
/*
* trans->ref protects trans->locking_wait.task, btree_paths arary; used
* by cycle detector
*/
closure_sync(&trans->ref);
trans->locking_wait.task = NULL;
unsigned long *paths_allocated = trans->paths_allocated;
trans->paths_allocated = NULL;
trans->paths = NULL;
@ -3273,8 +3280,6 @@ void bch2_trans_put(struct btree_trans *trans)
trans = this_cpu_xchg(c->btree_trans_bufs->trans, trans);
if (trans) {
closure_sync(&trans->ref);
seqmutex_lock(&c->btree_trans_lock);
list_del(&trans->list);
seqmutex_unlock(&c->btree_trans_lock);