+
+ m = genradix_ptr(&c->stripes, stripe_idx);
+
+ if (m->algorithm == head->algo &&
+ m->nr_redundant == head->redundancy &&
+ m->sectors == head->blocksize &&
+ m->blocks_nonempty < m->nr_blocks - m->nr_redundant &&
+ bch2_try_open_stripe(c, head->s, stripe_idx)) {
+ ret = stripe_idx;
+ break;
+ }
+ }
+ mutex_unlock(&c->ec_stripes_heap_lock);
+ return ret;
+}
+
+static int __bch2_ec_stripe_head_reuse(struct btree_trans *trans, struct ec_stripe_head *h)
+{
+ struct bch_fs *c = trans->c;
+ struct bch_stripe *new_v = &bkey_i_to_stripe(&h->s->new_stripe.key)->v;
+ struct bch_stripe *existing_v;
+ unsigned i;
+ s64 idx;
+ int ret;
+
+ /*
+ * If we can't allocate a new stripe, and there's no stripes with empty
+ * blocks for us to reuse, that means we have to wait on copygc:
+ */
+ idx = get_existing_stripe(c, h);
+ if (idx < 0)
+ return -BCH_ERR_stripe_alloc_blocked;
+
+ ret = get_stripe_key_trans(trans, idx, &h->s->existing_stripe);
+ if (ret) {
+ bch2_stripe_close(c, h->s);
+ if (!bch2_err_matches(ret, BCH_ERR_transaction_restart))
+ bch2_fs_fatal_error(c, "error reading stripe key: %s", bch2_err_str(ret));
+ return ret;
+ }
+
+ existing_v = &bkey_i_to_stripe(&h->s->existing_stripe.key)->v;
+
+ BUG_ON(existing_v->nr_redundant != h->s->nr_parity);
+ h->s->nr_data = existing_v->nr_blocks -
+ existing_v->nr_redundant;
+
+ ret = ec_stripe_buf_init(&h->s->existing_stripe, 0, h->blocksize);
+ if (ret) {
+ bch2_stripe_close(c, h->s);
+ return ret;
+ }
+
+ BUG_ON(h->s->existing_stripe.size != h->blocksize);
+ BUG_ON(h->s->existing_stripe.size != le16_to_cpu(existing_v->sectors));
+
+ /*
+ * Free buckets we initially allocated - they might conflict with
+ * blocks from the stripe we're reusing:
+ */
+ for_each_set_bit(i, h->s->blocks_gotten, new_v->nr_blocks) {
+ bch2_open_bucket_put(c, c->open_buckets + h->s->blocks[i]);
+ h->s->blocks[i] = 0;
+ }
+ memset(h->s->blocks_gotten, 0, sizeof(h->s->blocks_gotten));
+ memset(h->s->blocks_allocated, 0, sizeof(h->s->blocks_allocated));
+
+ for (i = 0; i < existing_v->nr_blocks; i++) {
+ if (stripe_blockcount_get(existing_v, i)) {
+ __set_bit(i, h->s->blocks_gotten);
+ __set_bit(i, h->s->blocks_allocated);