bcachefs: Add missing bch2_trans_begin()

this fixes a 'transaction should be locked' error in backpointers fsck

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

diff --git a/fs/bcachefs/backpointers.c b/fs/bcachefs/backpointers.c
index e8037b5d8332e8f58e3c7174584b91b41c9bd69e..6d8b1bc90be0c2f90d113eb18ced50a5f482c7eb 100644 (file)
--- a/fs/bcachefs/backpointers.c
+++ b/fs/bcachefs/backpointers.c
@@ -770,6 +770,8 @@ static int bch2_get_btree_in_memory_pos(struct btree_trans *trans,
                    !((1U << btree) & btree_interior_mask))
                        continue;
 
+               bch2_trans_begin(trans);
+
                __for_each_btree_node(trans, iter, btree,
                                      btree == start.btree ? start.pos : POS_MIN,
                                      0, depth, BTREE_ITER_prefetch, b, ret) {