bcachefs: better BTREE_INSERT_NO_CLEAR_REPLICAS

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

fs/bcachefs/btree_update_leaf.c

@@ -544,13 +544,6 @@ static inline int do_btree_insert_at(struct btree_trans *trans,
 	struct btree_insert_entry *i;
 	int ret;
 
-	if (likely(!(trans->flags & BTREE_INSERT_NO_CLEAR_REPLICAS)) &&
-	    trans->fs_usage_deltas) {
-		memset(&trans->fs_usage_deltas->fs_usage, 0,
-		       sizeof(trans->fs_usage_deltas->fs_usage));
-		trans->fs_usage_deltas->used = 0;
-	}
-
 	trans_for_each_update_iter(trans, i)
 		BUG_ON(i->iter->uptodate >= BTREE_ITER_NEED_RELOCK);
 
@@ -561,7 +554,7 @@ static inline int do_btree_insert_at(struct btree_trans *trans,
 			if (ret == -EINTR)
 				trace_trans_restart_mark(trans->ip);
 			if (ret)
-				return ret;
+				goto out_clear_replicas;
 		}
 
 	btree_trans_lock_write(c, trans);
@@ -655,6 +648,12 @@ static inline int do_btree_insert_at(struct btree_trans *trans,
 	}
 
 	bch2_journal_res_put(&c->journal, &trans->journal_res);
+out_clear_replicas:
+	if (trans->fs_usage_deltas) {
+		memset(&trans->fs_usage_deltas->fs_usage, 0,
+		       sizeof(trans->fs_usage_deltas->fs_usage));
+		trans->fs_usage_deltas->used = 0;
+	}
 
 	return ret;
 }

fs/bcachefs/buckets.c

@@ -1260,30 +1260,31 @@ void bch2_trans_fs_usage_apply(struct btree_trans *trans,
 
 /* trans_mark: */
 
-static void replicas_deltas_realloc(struct btree_trans *trans)
+static struct replicas_delta_list *
+replicas_deltas_realloc(struct btree_trans *trans, unsigned more)
 {
 	struct replicas_delta_list *d = trans->fs_usage_deltas;
-	unsigned new_size = d ? d->size * 2 : 128;
+	unsigned new_size = d ? (d->size + more) * 2 : 128;
 
+	if (!d || d->used + more > d->size) {
 		d = krealloc(d, sizeof(*d) + new_size, GFP_NOIO|__GFP_ZERO);
 		BUG_ON(!d);
 
 		d->size = new_size;
 		trans->fs_usage_deltas = d;
+	}
+	return d;
 }
 
 static inline void update_replicas_list(struct btree_trans *trans,
 					struct bch_replicas_entry *r,
 					s64 sectors)
 {
-	struct replicas_delta_list *d = trans->fs_usage_deltas;
+	struct replicas_delta_list *d;
 	struct replicas_delta *n;
 	unsigned b = replicas_entry_bytes(r) + 8;
 
-	if (!d || d->used + b > d->size) {
-		replicas_deltas_realloc(trans);
-		d = trans->fs_usage_deltas;
-	}
+	d = replicas_deltas_realloc(trans, b);
 
 	n = (void *) d->d + d->used;
 	n->delta = sectors;
@@ -1566,9 +1567,7 @@ int bch2_trans_mark_key(struct btree_trans *trans,
 		return bch2_trans_mark_extent(trans, k,
 				sectors, BCH_DATA_USER);
 	case KEY_TYPE_inode:
-		if (!trans->fs_usage_deltas)
-			replicas_deltas_realloc(trans);
-		d = trans->fs_usage_deltas;
+		d = replicas_deltas_realloc(trans, 0);
 
 		if (inserting)
 			d->fs_usage.nr_inodes++;
@@ -1578,9 +1577,7 @@ int bch2_trans_mark_key(struct btree_trans *trans,
 	case KEY_TYPE_reservation: {
 		unsigned replicas = bkey_s_c_to_reservation(k).v->nr_replicas;
 
-		if (!trans->fs_usage_deltas)
-			replicas_deltas_realloc(trans);
-		d = trans->fs_usage_deltas;
+		d = replicas_deltas_realloc(trans, 0);
 
 		sectors *= replicas;
 		replicas = clamp_t(unsigned, replicas, 1,