bcachefs: Fix copygc sectors_to_move calculation

With erasure coding, copygc's count of sectors to move was off, which
matters for the debug statement it prints out when it's not able to move
all the data it tried to.
Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>

fs/bcachefs/move.c

@@ -768,8 +768,7 @@ static int __bch2_move_data(struct bch_fs *c,
 		if (rate)
 			bch2_ratelimit_increment(rate, k.k->size);
 next:
-		atomic64_add(k.k->size * bch2_bkey_nr_ptrs_allocated(k),
-			     &stats->sectors_seen);
+		atomic64_add(k.k->size, &stats->sectors_seen);
 next_nondata:
 		bch2_btree_iter_advance(&iter);
 	}

fs/bcachefs/movinggc.c

@@ -139,7 +139,7 @@ static int bch2_copygc(struct bch_fs *c)
 	struct copygc_heap_entry e, *i;
 	struct bucket_array *buckets;
 	struct bch_move_stats move_stats;
-	u64 sectors_to_move = 0, sectors_not_moved = 0;
+	u64 sectors_to_move = 0, sectors_to_write = 0, sectors_not_moved = 0;
 	u64 sectors_reserved = 0;
 	u64 buckets_to_move, buckets_not_moved = 0;
 	struct bch_dev *ca;
@@ -205,22 +205,23 @@ static int bch2_copygc(struct bch_fs *c)
 		up_read(&ca->bucket_lock);
 	}
 
+	/*
+	 * Our btree node allocations also come out of RESERVE_MOVINGGC:
+	 */
+	sectors_reserved = (sectors_reserved * 3) / 4;
 	if (!sectors_reserved) {
 		bch2_fs_fatal_error(c, "stuck, ran out of copygc reserve!");
 		return -1;
 	}
 
-	/*
-	 * Our btree node allocations also come out of RESERVE_MOVINGGC:
-	 */
-	sectors_to_move = (sectors_to_move * 3) / 4;
-
-	for (i = h->data; i < h->data + h->used; i++)
-		sectors_to_move += i->sectors * i->replicas;
+	for (i = h->data; i < h->data + h->used; i++) {
+		sectors_to_move += i->sectors;
+		sectors_to_write += i->sectors * i->replicas;
+	}
 
-	while (sectors_to_move > sectors_reserved) {
+	while (sectors_to_write > sectors_reserved) {
 		BUG_ON(!heap_pop(h, e, -fragmentation_cmp, NULL));
-		sectors_to_move -= e.sectors * e.replicas;
+		sectors_to_write -= e.sectors * e.replicas;
 	}
 
 	buckets_to_move = h->used;