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bcachefs; Don't use btree write buffer until journal replay is finished

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The keys being replayed by journal replay have to be synchronized with
updates by other threads that overwrite them. We rely on btree node
locks for synchronizing - but since btree write buffer updates take no
btree locks, that won't work.

Instead, simply disable using the btree write buffer until journal
replay is finished.

This fixes a rare backpointers error in the merge_torture_flakey test.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2023-12-01 22:31:23 -05:00
parent 0117591e69
commit ef6fae4a13
1 changed files with 16 additions and 0 deletions
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16
fs/bcachefs/btree_update.c
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@ -554,6 +554,19 @@ int __must_check bch2_trans_update_seq(struct btree_trans *trans, u64 seq,
BTREE_UPDATE_PREJOURNAL);
}
static noinline int bch2_btree_insert_clone_trans(struct btree_trans *trans,
enum btree_id btree,
struct bkey_i *k)
{
struct bkey_i *n = bch2_trans_kmalloc(trans, bkey_bytes(&k->k));
int ret = PTR_ERR_OR_ZERO(n);
if (ret)
return ret;
bkey_copy(n, k);
return bch2_btree_insert_trans(trans, btree, n, 0);
}
int __must_check bch2_trans_update_buffered(struct btree_trans *trans,
enum btree_id btree,
struct bkey_i *k)
@ -564,6 +577,9 @@ int __must_check bch2_trans_update_buffered(struct btree_trans *trans,
EBUG_ON(trans->nr_wb_updates > trans->wb_updates_size);
EBUG_ON(k->k.u64s > BTREE_WRITE_BUFERED_U64s_MAX);
if (unlikely(trans->journal_replay_not_finished))
return bch2_btree_insert_clone_trans(trans, btree, k);
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);