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bcachefs: Free iterator if we have duplicate

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This helps - but does not fully fix - the outstanding "transaction
iterator overflow" bugs.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
This commit is contained in:
Kent Overstreet 2021-08-23 17:19:17 -04:00 committed by Kent Overstreet
parent f4ccfe07e2
commit dc02bed6d9
2 changed files with 20 additions and 2 deletions
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21
fs/bcachefs/btree_iter.c
View File

@ -2204,6 +2204,22 @@ static inline void __bch2_trans_iter_free(struct btree_trans *trans,
btree_trans_verify_sorted_refs(trans);
}
static bool have_iter_at_pos(struct btree_trans *trans,
struct btree_iter *iter)
{
struct btree_iter *n;
n = prev_btree_iter(trans, iter);
if (n && !btree_iter_cmp(n, iter))
return true;
n = next_btree_iter(trans, iter);
if (n && !btree_iter_cmp(n, iter))
return true;
return false;
}
int bch2_trans_iter_put(struct btree_trans *trans,
struct btree_iter *iter)
{
@ -2217,8 +2233,9 @@ int bch2_trans_iter_put(struct btree_trans *trans,
ret = btree_iter_err(iter);
if (!(trans->iters_touched & (1ULL << iter->idx)) &&
!(iter->flags & BTREE_ITER_KEEP_UNTIL_COMMIT))
if (!(iter->flags & BTREE_ITER_KEEP_UNTIL_COMMIT) &&
(!(trans->iters_touched & (1ULL << iter->idx)) ||
have_iter_at_pos(trans, iter)))
__bch2_trans_iter_free(trans, iter->idx);
trans->iters_live &= ~(1ULL << iter->idx);

1
fs/bcachefs/btree_update_leaf.c
View File

@ -1040,6 +1040,7 @@ int bch2_trans_update(struct btree_trans *trans, struct btree_iter *iter,
n.iter = bch2_trans_get_iter(trans, n.btree_id, n.k->k.p,
BTREE_ITER_INTENT|
BTREE_ITER_NOT_EXTENTS);
n.iter->flags |= BTREE_ITER_KEEP_UNTIL_COMMIT;
ret = bch2_btree_iter_traverse(n.iter);
bch2_trans_iter_put(trans, n.iter);