bcachefs: Add an error message for copygc spinning

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>

diff --git a/fs/bcachefs/movinggc.c b/fs/bcachefs/movinggc.c
index 346b9ee667ec7e08b584f172d31f46020ab3701f..46a0875135d5424d9cdf99debd661ce55dfccb60 100644 (file)
--- a/fs/bcachefs/movinggc.c
+++ b/fs/bcachefs/movinggc.c
@@ -205,6 +205,11 @@ static int bch2_copygc(struct bch_fs *c)
                up_read(&ca->bucket_lock);
        }
 
+       if (!h->used) {
+               bch_err_ratelimited(c, "copygc requested to run but found no buckets to move!");
+               return 0;
+       }
+
        /*
         * Our btree node allocations also come out of RESERVE_MOVINGGC:
         */