bcachefs: Fix btree node prefetchig

We were forgetting to count down the number of nodes to prefetch, firing
off _way_ more than intended - whoops.

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

diff --git a/fs/bcachefs/btree_iter.c b/fs/bcachefs/btree_iter.c
index 0bb156e6152a06bfa97bc24ad8c2b9985b36dfde..c87129a1164011d5a312231051be1135ca104d03 100644 (file)
--- a/fs/bcachefs/btree_iter.c
+++ b/fs/bcachefs/btree_iter.c
@@ -764,7 +764,7 @@ static int btree_path_prefetch(struct btree_trans *trans, struct btree_path *pat
 
        bch2_bkey_buf_init(&tmp);
 
-       while (nr && !ret) {
+       while (nr-- && !ret) {
                if (!bch2_btree_node_relock(trans, path, path->level))
                        break;
 
@@ -799,7 +799,7 @@ static int btree_path_prefetch_j(struct btree_trans *trans, struct btree_path *p
 
        bch2_bkey_buf_init(&tmp);
 
-       while (nr && !ret) {
+       while (nr-- && !ret) {
                if (!bch2_btree_node_relock(trans, path, path->level))
                        break;